阅读说明：本技术 成形面连接件和成形面连接件的制造方法 (Molded surface connector and method for manufacturing molded surface connector ) 是由 任志宇 松井隆之 小山洋平 桥爪淳 于 2018-02-13 设计创作，主要内容包括：本发明的成形面连接件具有：基部(11、81)；左右的外壁部(20、50),其沿着长度方向配置于基部(11、81)的上表面；多个卡合元件(13),其配置于左右的外壁部(20、50)之间；以及左右的磁性壁部(30、30a、30b、30c),其沿着长度方向配置于外壁部(20、50)与卡合元件(13)之间。该成形面连接件是第1合成树脂和含有磁性颗粒的第2合成树脂相互熔融一体化而成形的。另外,外壁部(20、50)的至少上端部仅由第1合成树脂形成,磁性壁部(30、30a、30b、30c)的至少上端部仅由第2合成树脂形成。由此,能够将左右的磁性壁部(30、30a、30b、30c)稳定地形成为预定的形状。另外,能够将外壁部(20、50)和卡合元件(13)稳定地形成为预定的形状且具备恰当的强度。(The forming surface connecting piece of the invention comprises: a base (11, 81); left and right outer wall portions (20, 50) arranged on the upper surfaces of the base portions (11, 81) along the longitudinal direction; a plurality of engaging elements (13) disposed between the left and right outer wall portions (20, 50); and left and right magnetic wall portions (30, 30a, 30b, 30c) arranged between the outer wall portions (20, 50) and the engaging element (13) along the longitudinal direction. The molding surface connector is formed by fusing and integrating the 1 st synthetic resin and the 2 nd synthetic resin containing magnetic particles. At least the upper end portions of the outer wall portions (20, 50) are formed of only the 1 st synthetic resin, and at least the upper end portions of the magnetic wall portions (30, 30a, 30b, 30c) are formed of only the 2 nd synthetic resin. This enables the left and right magnetic wall portions (30, 30a, 30b, 30c) to be stably formed into a predetermined shape. In addition, the outer wall portions (20, 50) and the engaging element (13) can be stably formed into a predetermined shape and have appropriate strength.)

1. A profiled surface connection (1, 1a, 2, 3) having: a thin plate-like base (11, 81); left and right outer wall portions (20, 50) provided upright on the upper surfaces of the base portions (11, 81) along the longitudinal direction; and a plurality of engaging elements (13) disposed between the right and left outer wall portions (20, 50), wherein the molding surface connectors (1, 1a, 2, 3) are formed by fusing and integrating a 1 st synthetic resin and a 2 nd synthetic resin containing magnetic particles at a predetermined ratio,

at least upper end portions of the left and right outer wall portions (20, 50) are formed only of the 1 st synthetic resin,

left and right magnetic wall portions (30, 30a, 30b, 30c) each having at least an upper end portion formed only of the 2 nd synthetic resin are provided upright on the upper surface of the base portion (11, 81),

the left and right magnetic wall portions (30, 30a, 30b, 30c) are arranged at positions between the outer wall portions (20, 50) and the engaging elements (13) in the width direction along the longitudinal direction.

2. The forming side connection of claim 1,

the magnetic wall (30, 30a, 30b, 30c) has a mixing region (35) formed by mixing the 1 st synthetic resin and the 2 nd synthetic resin.

3. Forming face connection according to claim 1 or 2,

the base portion (11, 81) has a groove portion (40, 40a, 40b), and the groove portion (40, 40a, 40b) is recessed in an upper surface portion of the base portion (11, 81), and is disposed between each outer wall portion (20, 50) and each magnetic wall portion (30, 30a, 30b, 30c), and between the engaging element (13) and each magnetic wall portion (30, 30a, 30b, 30 c).

4. A forming side connection according to claim 3,

the groove portion (40, 40a, 40b) has a certain groove depth from the upper surface of the base portion (11, 81), and is continuously recessed in the longitudinal direction.

5. Forming face connection according to claim 3 or 4,

the groove portion (40, 40a, 40b) has: inner groove portions (41, 41a, 41b) disposed closer to the engaging element (13) than the magnetic wall portions (30, 30a, 30b, 30 c); and an outer side groove portion (42, 42a, 42b) disposed closer to the outer wall portion (20, 50) than the magnetic wall portion (30, 30a, 30b, 30c),

the width dimension of the inside groove portions (41, 41a, 41b) and the width dimension of the outside groove portions (42, 42a, 42b) have different sizes from each other.

6. A forming side connection according to any one of claims 1 to 5,

the magnetic wall (30, 30a, 30b, 30c) has a height dimension that is the same as the height dimension of the outer wall (20, 50).

7. A forming side connection according to any one of claims 1 to 6,

the magnetic wall sections (30, 30a, 30b, 30c) have a plurality of magnetic wall sections (31, 31a, 31b, 33a, 33b) that are intermittently arranged at a predetermined pitch along the longitudinal direction.

8. A forming side connection according to claim 7,

each magnetic wall body (31, 31a, 31b, 33a, 33b) has a mixing region (35) formed by mixing the 1 st synthetic resin and the 2 nd synthetic resin,

the mixing region (35) is disposed so as to be offset to one side in the longitudinal direction of the molding surface fastener (1, 1a, 2, 3).

9. A forming side connection according to any one of claims 1 to 8,

the dimension of the magnetic wall (30, 30a, 30b, 30c) in the width direction is 1 to 6 times the size of the average particle diameter of the magnetic particles.

10. A forming side connection according to any one of claims 1 to 9,

the molding surface fastener (1, 1a, 2, 3) is formed such that, in a state in which the molding surface fastener (1, 1a, 2, 3) is attached to a molding die (70) of a cushion body to be integrated with the molding surface fastener (1, 1a, 2, 3), at least a part of an upper surface of the left magnetic wall portion (30, 30a, 30b, 30c) and at least a part of an upper surface of the right magnetic wall portion (30, 30a, 30b, 30c) can be brought into contact with a magnet (73) attached and fixed to the molding die (70).

11. A method for manufacturing a molded surface fastener (1, 1a, 2, 3) using a molding device (60), the molding device (60) comprising: a die wheel (61) which rotates in one direction; and an extrusion nozzle (66) for ejecting the 1 st synthetic resin and the 2 nd synthetic resin containing magnetic particles in a predetermined ratio toward the die wheel (61) in a molten state, wherein the molding surface fastener (1, 1a, 2, 3) comprises: a thin plate-like base (11, 81); left and right outer wall portions (20, 50) provided upright on the upper surfaces of the base portions (11, 81) along the longitudinal direction; and a plurality of engaging elements (13) disposed between the left and right outer wall portions (20, 50), the method for manufacturing the molded surface fastener being characterized in that,

ejecting the 1 st synthetic resin from a 1 st ejection port (66d) of the extrusion nozzle (66) toward the rotating die wheel (61), and ejecting the 2 nd synthetic resin from a 2 nd ejection port (66e) of the extrusion nozzle (66) toward the rotating die wheel (61);

forming at least upper end portions of the right and left outer wall portions (20, 50) only of the 1 st synthetic resin; and

left and right magnetic wall portions (30, 30a, 30b, 30c) are formed on the upper surfaces of the base portions (11, 81), at least upper end portions of the left and right magnetic wall portions (30, 30a, 30b, 30c) are formed only of the 2 nd synthetic resin, and the left and right magnetic wall portions (30, 30a, 30b, 30c) are arranged at positions between the outer wall portions (20, 50) and the engaging elements (13) in the width direction along the length direction.

12. The method of manufacturing a forming surface fastener according to claim 11,

the manufacturing method of the forming surface connecting piece comprises the following steps:

forming the die wheel (61) by overlapping a plurality of annular laminated plates (62) in a rotational axis direction;

as the laminated plates (62), a plurality of 1 st laminated plates (62a) having a certain radius and a plurality of 2 nd laminated plates (62b) having a certain radius larger than the radius of the 1 st laminated plate (62a) are used,

using a set of two of the 2 nd laminated plates (62b) for each 2 nd ejection port (66e), and arranging a set of the 2 nd laminated plates (62b) such that the 2 nd ejection port (66e) is arranged between the set of the 2 nd laminated plates (62 b); and

by utilizing the difference in radius between the 1 st laminated plate (62a) and the 2 nd laminated plate (62b) in the die wheel (61), the recess portions (40, 40a, 40b) are formed in the molding surface connectors (1, 1a, 2, 3), and the recess portions (40, 40a, 40b) are recessed in the upper surface portions of the base portions (11, 81) and are disposed on the left and right sides of the respective magnetic wall portions (30, 30a, 30b, 30 c).

Technical Field

The present invention relates to a forming surface fastener in which a plurality of engaging elements are provided upright on a thin plate-like base portion, and a method of manufacturing the forming surface fastener.

Background

Seats for seats of automobiles and trains, various sofas, office chairs, and the like are sometimes configured by covering a surface of a cushion body (foam) molded into a predetermined shape using a foamable resin with a covering material made of a fiber fabric, natural leather, synthetic leather, or the like. The cushioning body used in such various seats and the like may have a curved surface having a concave-convex shape that satisfies ergonomics in order to maintain a sitting posture that is not fatigued even if the seat is taken for a long time.

In addition, when the skin material is covered on the surface of the cushion body, the following method is often employed: after the cushion body is shaped into a desired shape, a skin material is covered on the surface of the obtained cushion body and fixed. In particular, in this case, a molded surface fastener having a plurality of hook-shaped engaging elements is generally used as a means for fixing the front surface of the cushion body and the back surface of the skin material.

The molded surface fastener is formed by arranging a plurality of hook-shaped male engaging elements on one surface of a base member formed of a thermoplastic resin. Such a molded surface fastener is attached to a cavity surface of a mold, and foam molding of the cushion body is performed using the mold to which the molded surface fastener is attached. Thus, the molded surface connector is integrated with the surface of the molded cushion body in such a manner that the engaging elements are exposed. On the other hand, a plurality of annular female engaging elements that can be engaged with the engaging elements of the molding surface fastener are provided on the back surface of the skin material covering the cushion body.

Then, the skin material is covered on the cushion body integrated with the molding surface fastener, and then the annular engaging elements disposed on the back surface of the skin material are pressed against the molding surface fastener disposed on the surface of the cushion body, so that the annular engaging elements of the skin material are engaged with the hook-shaped engaging elements of the molding surface fastener, and the skin material is locked to the molding surface fastener. Thereby, the skin material is easily fixed to the surface of the cushion body along the uneven shape of the surface, preventing the skin material from floating from the cushion body.

In addition, magnetic force is used as a means for attaching the molding surface fastener to the cavity surface of the mold when the cushion body is foam-molded. For example, the following means have been conventionally performed: a magnet is embedded in a molding surface connector on the connector mounting surface of a mold, and a magnetic material magnetically attracted to the molding surface connector is attached to the molding surface connector or the molding surface connector partially contains the magnetic material.

As a method for attaching the magnetic material to the molded surface fastener, the following methods and the like are performed: the method includes the steps of fixing a monofilament containing a magnetic material to a base portion of a forming surface fastener, laminating a film containing a magnetic material to the base portion of the forming surface fastener, and applying the magnetic material to a flat plate-shaped base portion of the forming surface fastener.

When the molded surface connector partially contains a magnetic material, the following method is generally used: the molded surface connector is manufactured by performing two-color molding using, for example, a synthetic resin material containing a magnetic material (magnetic particles) and a synthetic resin material not containing a magnetic material. An example of such a molded surface connector produced by two-color molding is disclosed in international publication No. 2017/141436 (patent document 1). Here, fig. 16 shows a molded surface fastener described in patent document 1. In fig. 16, the portion of the forming surface connector containing the magnetic particles is shown with a gray color.

The molded surface connector 100 of patent document 1 includes: a thin plate-like base 101 (also referred to as a base material portion); left and right resin entry prevention wall portions 102 arranged along the longitudinal direction at left and right side edges of the base portion 101; a plurality of hook-shaped engaging elements 103 arranged between the left and right resin entry preventing wall portions 102; a horizontal wall portion 104 arranged along the left-right direction; and fin portions 105 extending in the width direction outward from the left and right side edges of the base portion 101.

The left and right resin entry prevention wall portion 102 in patent document 1 includes: a 1 st vertical wall row 111 formed on the inner side in the width direction (near the center of the base 101); a 2 nd vertical wall row 112 formed on the outer side in the width direction (on the left and right side edges of the base 101); and a connecting wall portion 113 that connects the 1 st vertical wall row 111 and the 2 nd vertical wall row 112.

The 1 st vertical wall row 111 and the 2 nd vertical wall row 112 have a plurality of divided vertical walls 115 arranged intermittently at a constant pitch. In this case, the divided vertical wall portions 115 in the 1 st vertical wall row 111 and the divided vertical wall portions 115 in the 2 nd vertical wall row 112 are arranged in a zigzag manner with their installation positions shifted in the longitudinal direction in a staggered manner.

The connecting wall portion 113 of the resin-intrusion prevention wall portion 102 connects a front end portion (or a rear end portion) of the divided vertical wall portion 115 disposed in the 1 st vertical wall row 111 and a rear end portion (or a front end portion) of the divided vertical wall portion 115 disposed in the 2 nd vertical wall row 112 to each other. In this case, the divided vertical wall portion 115 disposed in the 1 st vertical wall row 111 is connected to the two divided vertical wall portions 115 disposed in the adjacent 2 nd vertical wall row 112 via the two connecting wall portions 113.

The height of each connecting wall portion 113 from the upper surface of the base portion 101 is set to be equal to the height of the vertical wall segment 115 in the 1 st vertical wall row 111 and the vertical wall segment 115 in the 2 nd vertical wall row 112. Therefore, the left and right resin-entry preventing wall portions 102 are continuously formed in zigzag at a constant height by the divided vertical wall portions 115 of the 1 st vertical wall row 111, the connecting wall portion 113, and the divided vertical wall portions 115 of the 2 nd vertical wall row 112.

In the molded surface fastener 100 of patent document 1, magnetic particles are contained in the left and right resin intrusion prevention wall portions 102. The base 101, the engaging element 103, and the lateral wall 104 substantially do not contain magnetic particles. In addition, a concentration slope portion that decreases the concentration of magnetic particles downward is formed in each resin entry prevention wall portion 102.

In the molding surface connector 100 of patent document 1, since the left and right resin-intrusion prevention wall portions 102 contain magnetic particles that can be attracted to the magnet, when the magnet is buried under the connector attachment surface of the mold, by bringing the molding surface connector 100 close to the connector attachment surface of the mold, the molding surface connector 100 can be magnetically attracted to the connector attachment surface, and can be fixed in the orientation in which the engaging elements 103 face the connector attachment surface.

At this time, the left and right resin entry preventing wall portions 102 are in close contact with the mold, so that the engaging regions provided with the plurality of engaging elements 103 disposed inside the left and right resin entry preventing wall portions 102 can be separated from the regions outside the left and right resin entry preventing wall portions 102. Thus, when the cushion body is foam-molded, the foamed resin material can be prevented from crossing the resin entry prevention wall portion 102 from the outer region of the resin entry prevention wall portion 102 and entering the engagement region. As a result, the following cushion body can be stably manufactured: the molded surface connector 100 is integrated with the surface of the cushion body, and the plurality of engaging elements 103 of the molded surface connector 100 are exposed.

In addition, in the molded surface connector 100 of patent document 1, since the resin-entrance preventing wall portion 102 is provided with the above-described concentration slope portion of the magnetic particles, it is difficult to clearly form the boundary portion between the portion containing the magnetic particles and the portion containing only the synthetic resin without the magnetic particles.

As a result, the adhesiveness between the portion containing the magnetic particles and the portion not containing the magnetic particles in the molded surface connector 100 can be improved. This makes it possible to prevent cracks and fissures from being generated in the molded surface fastener 100 in, for example, the molding step of the molded surface fastener 100, and thus, the production efficiency, yield, and the like of the molded surface fastener 100 can be improved.

On the other hand, when the synthetic resin contains magnetic particles, the flexibility of the synthetic resin is generally reduced. Further, the flexibility of the synthetic resin tends to decrease as the content of the magnetic particles increases. Therefore, in the molded surface connector 100 of patent document 1, the resin-intrusion prevention wall portion 102 is provided with the above-described concentration slope portion of the magnetic particles, thereby reducing the amount of the magnetic particles used. At the same time, the dimension (hereinafter, simply referred to as the width dimension) of the coupling wall portion 113 of the resin intrusion prevention wall portion 102 in the connector width direction is secured to be large, and the coupling wall portion 113 is formed so as to be easily elastically deformed. Thus, the molded surface fastener 100 of patent document 1 can stably have appropriate flexibility.

Disclosure of Invention

Problems to be solved by the invention

In the mold used for foam molding of the cushion body, in order to attach the molding surface connector to the cavity surface of the mold, as described above, the magnet is embedded in the connector attachment surface. In recent years, the width of the magnet provided on the connector attachment surface of the mold may be reduced in view of cost.

On the other hand, in the molded surface fastener 100 of patent document 1 shown in fig. 16, the width dimension of the resin intrusion prevention wall portion 102 is formed large as described above in order to have appropriate flexibility. However, when the molding surface connector 100 having the resin intrusion prevention wall portion 102 with an increased width is fixed to the connector attachment surface of the mold by being attracted to, for example, an elongated magnet with a reduced width, the width between the outer side surfaces of the left and right resin intrusion prevention wall portions 102 in the molding surface connector 100 may be larger than the width of the elongated magnet.

In this case, there are problems as follows: either one of the left and right resin intrusion prevention wall portions 102 is attracted to an elongated magnet of the mold, and the position of the molding surface connector 100 is likely to be displaced in the width direction with respect to the connector attachment surface of the mold. Further, if the position of the molding surface fastener 100 is shifted in the width direction in this manner, one of the left and right resin-intrusion prevention wall portions 102 in the molding surface fastener 100 cannot come into close contact with the mold, and as a result, there is a possibility that the foaming resin material may cross over the resin-intrusion prevention wall portion 102 from the outer region of the resin-intrusion prevention wall portion 102 and enter the engagement region during foam molding of the cushion body.

In the molded surface fastener 100 of patent document 1, the left and right resin intrusion prevention wall portions 102 have a constant height dimension and a complicated shape that continues in a zigzag shape. In this case, each of the divided vertical wall portions 115 forming the resin entry prevention wall portion 102 is formed to be elongated in the longitudinal direction, and the coupling wall portion 113 forming the resin entry prevention wall portion 102 is formed to be elongated in the width direction.

In the case of molding the molding surface fastener 100 of patent document 1 having such a complicated shape while ejecting a molten synthetic resin containing magnetic particles and a molten synthetic resin containing no magnetic particles toward a die wheel using a molding apparatus having a die wheel as described in patent document 1, for example, the cavity space provided in the die wheel for molding the left and right resin entry preventing wall portions 102 is formed into a complicated and thin shape in accordance with the resin entry preventing wall portions 102.

Therefore, even if the molten synthetic resin containing the magnetic particles is discharged toward the die wheel, the molten synthetic resin has lower fluidity than, for example, a synthetic resin containing no magnetic particles, and therefore, it is difficult to fill the cavity of the resin entry prevention wall portion 102. As a result, the following problems may occur: the resin entry prevention wall portion 102 cannot be molded into a predetermined shape, and the magnetic particles leak out from the resin entry prevention wall portion 102 and enter the hook-shaped engaging elements 103 to reduce the strength of the engaging elements 103.

In addition, when the magnetic particles leak from the resin entry prevention wall portion 102 as described above, the synthetic resin containing no magnetic particles may enter the resin entry prevention wall portion 102 with respect to the resin entry prevention wall portion 102. If the synthetic resin not containing the magnetic particles enters the resin entry prevention wall portion 102 in this manner to form the resin entry prevention wall portion 102, the synthetic resin not containing the magnetic particles and the synthetic resin containing the magnetic particles are mixed in the resin entry prevention wall portion 102 and may be exposed to the outer surface of the resin entry prevention wall portion 102. In such a case, for example, when image inspection is performed to check whether or not the resin entry prevention wall portion 102 properly contains magnetic particles, the determination may be difficult.

The present invention has been made in view of the above problems, and an object thereof is to provide a molded surface fastener molded by two-color molding using a molten synthetic resin containing magnetic particles and a molten synthetic resin containing substantially no magnetic particles, in which a portion containing magnetic particles is stably molded into a predetermined shape and leakage of magnetic particles to portions such as engaging elements molded from the synthetic resin containing substantially no magnetic particles is suppressed, and a manufacturing method of the molded surface fastener.

Means for solving the problems

In order to achieve the above object, the present invention provides a forming surface fastener comprising: a thin plate-like base; left and right outer wall portions erected along a longitudinal direction on an upper surface of the base portion; and a plurality of engaging elements disposed between the left and right outer wall portions, wherein the molding surface fastener is formed by fusing and integrating a 1 st synthetic resin and a 2 nd synthetic resin containing magnetic particles at a predetermined ratio, and is characterized in that at least upper end portions of the left and right outer wall portions are formed only of the 1 st synthetic resin, left and right magnetic wall portions formed only of the 2 nd synthetic resin at least upper end portions thereof are erected on an upper surface of the base portion, and the left and right magnetic wall portions are disposed at positions between the outer wall portions and the engaging elements in a width direction along a longitudinal direction.

In particular, in the molded surface fastener of the present invention, it is preferable that the magnetic wall portion has a mixing region in which the 1 st synthetic resin and the 2 nd synthetic resin are mixed.

In the molded surface fastener according to the present invention, it is preferable that the base portion has a groove portion which is provided in a recessed manner in an upper surface portion of the base portion and is disposed between each of the outer wall portions and each of the magnetic wall portions and between the engaging element and each of the magnetic wall portions.

In this case, it is preferable that the recessed portion has a groove depth from an upper surface of the base portion and is recessed continuously in a longitudinal direction. Further, it is preferable that the groove portion has: an inner groove portion disposed closer to the engaging element than the magnetic wall portion; and an outer groove portion disposed closer to the outer wall portion than the magnetic wall portion, wherein a width dimension of the inner groove portion and a width dimension of the outer groove portion have different sizes from each other.

In the molded surface fastener according to the present invention, it is preferable that the height dimension of the magnetic wall portion is the same as the height dimension of the outer wall portion.

Preferably, the magnetic wall portion has a plurality of magnetic wall bodies intermittently arranged at a predetermined pitch along the longitudinal direction.

In the present invention, it is preferable that each of the magnetic wall bodies has a mixed region formed by mixing the 1 st synthetic resin and the 2 nd synthetic resin, and the mixed region is disposed to be offset to one side in a longitudinal direction of the forming surface fastener.

Further, it is preferable that the dimension of the magnetic wall in the width direction is 1 to 6 times larger than the average particle diameter of the magnetic particles.

In addition, it is preferable that the molding surface fastener is formed so that at least a part of the upper surface of the left magnetic wall portion and at least a part of the upper surface of the right magnetic wall portion can be brought into contact with a magnet attached and fixed to a molding die in a state where the molding surface fastener is attached to the molding die of the cushion body to be integrated with the molding surface fastener.

Next, according to the present invention, there is provided a method of manufacturing a molded surface fastener, in which the molded surface fastener is manufactured using a molding apparatus, the molding apparatus including: a die wheel rotating in one direction; and an extrusion nozzle for ejecting the 1 st synthetic resin and the 2 nd synthetic resin containing magnetic particles at a predetermined ratio toward the die wheel in a molten state, the molding surface fastener comprising: a thin plate-like base; left and right outer wall portions erected along a longitudinal direction on an upper surface of the base portion; and a plurality of engaging elements disposed between the left and right outer wall portions, wherein the method for manufacturing the molded surface fastener is characterized by comprising: ejecting the 1 st synthetic resin from the 1 st ejection port of the extrusion nozzle toward the die wheel that rotates, and ejecting the 2 nd synthetic resin from the 2 nd ejection port of the extrusion nozzle toward the die wheel that rotates; forming at least upper end portions of the right and left outer wall portions only of the 1 st synthetic resin; and forming left and right magnetic wall portions on an upper surface of the base portion, at least upper end portions of the left and right magnetic wall portions being formed of only the 2 nd synthetic resin, and the left and right magnetic wall portions being arranged at positions between the outer wall portion and the engaging elements in a width direction along a longitudinal direction.

Preferably, the method of manufacturing a molded surface fastener according to the present invention includes: forming the die wheel by overlapping a plurality of annular laminated plates in a rotational axis direction; as the laminated plates, a plurality of 1 st laminated plates having a certain radius and a plurality of 2 nd laminated plates having a certain radius larger than that of the 1 st laminated plates are used; a pair of the 2 nd laminated plates is used for each 2 nd ejection port, and a pair of the 2 nd laminated plates is arranged such that the 2 nd ejection port is arranged between the pair of the 2 nd laminated plates; and forming a recessed portion in the forming surface connecting member by utilizing a difference in radius between the 1 st laminated plate and the 2 nd laminated plate in the die wheel, the recessed portion being recessed in an upper surface portion of the base portion and being disposed on both left and right sides of each of the magnetic wall portions.

ADVANTAGEOUS EFFECTS OF INVENTION

The molding surface connector of the present invention is molded by melting and integrating the 1 st synthetic resin containing substantially no magnetic particles and the 2 nd synthetic resin containing magnetic particles at a predetermined ratio. The forming surface connecting piece comprises: a thin plate-like base; left and right outer wall portions erected along a longitudinal direction on an upper surface of the base portion; a plurality of engaging elements disposed between the left and right outer wall portions; and left and right magnetic wall portions that are provided upright along the longitudinal direction at positions between the outer wall portion and the engaging elements in the width direction.

In the molded surface fastener of the present invention, at least the upper end portions of the left and right outer wall portions are formed of only the 1 st synthetic resin substantially not containing magnetic particles. At least the upper end portions of the left and right magnetic wall portions are formed of only the 2 nd synthetic resin containing magnetic particles at a predetermined ratio.

The 2 nd synthetic resin is ejected (extruded) in a molten state to a die wheel described later at the time of molding the molding surface fastener, and the 2 nd synthetic resin molds the molding surface fastener together with the 1 st synthetic resin after the melting by the outer peripheral surface portion of the die wheel. Therefore, in the molded surface fastener of the present invention, as in a conventional molded surface fastener of a type in which, for example, a monofilament containing a magnetic material is fixed to a base material portion, a boundary portion between a portion containing magnetic particles and a portion containing substantially no magnetic particles and only a synthetic resin is not clearly formed, but the 1 st synthetic resin and the 2 nd synthetic resin are mixed in a blurred (unclear) manner to mold a magnetic wall portion.

As long as the molding surface fastener of the present invention is described above, the left and right magnetic wall portions formed only of the 2 nd synthetic resin at least at the upper end portions thereof are disposed at different positions (positions close to the engaging elements) inside the left and right outer wall portions that prevent (or mainly prevent) the entry of the foamable resin at the time of foam molding of the cushion body in the width direction of the molding surface fastener. Thus, the shape of the left and right magnetic wall portions can be different from the shape of the left and right outer wall portions that prevent the foamable resin from entering. Therefore, the left and right magnetic wall portions can be formed in a simple shape in which, for example, the molten 2 nd synthetic resin containing the magnetic particles (i.e., the molten 2 nd synthetic resin having relatively low fluidity) is easily filled into the cavity for molding the magnetic wall portions.

Thus, in the molding step of molding the molding surface fastener using, for example, a die wheel, the molten 2 nd synthetic resin is ejected to the die wheel, so that the molten 2 nd synthetic resin can be stably filled into the cavity of the die wheel for molding the magnetic wall portion, and leakage to other portions due to a defective filling of the 2 nd synthetic resin into the cavity can be suppressed (or prevented). Therefore, the forming surface connector of the present invention can stably include: a left and right magnetic wall portion having a predetermined shape, at least an upper end portion of which is formed of a 2 nd synthetic resin; and a left and right outer wall portion and a plurality of engaging elements each having a predetermined shape and an appropriate strength, wherein the leakage of the 2 nd synthetic resin to the outer wall portion and the plurality of engaging elements is suppressed (or prevented).

As described above, the molding surface fastener of the present invention is formed so that the 2 nd synthetic resin containing the magnetic particles is easily filled into the cavity for molding the magnetic wall portion in the molding step, and therefore, at least the upper end portion of the magnetic wall portion can be stably formed only from the 2 nd synthetic resin. Thus, when a mold having a magnet provided on the molding surface of the link is used for foam molding of the cushion body, for example, a stronger magnetic force can be stably obtained between the magnet of the mold and the magnetic particles contained in the molding surface link.

Therefore, the molding surface connector can be reliably fixed by being attracted to the connector attachment surface of the mold with a stronger attraction force. In addition, the following self-alignment effect can also be stably obtained: the position and orientation of the molding surface fastener to be attached can be accurately and automatically aligned in accordance with the position and orientation of the magnet disposed in the fastener holding portion of the mold by using a strong magnetic force generated between the magnet of the mold and the magnetic particles of the molding surface fastener.

Further, since at least the upper end portion of the magnetic wall portion is stably formed only by the 2 nd synthetic resin, the 1 st synthetic resin and the 2 nd synthetic resin can be prevented from being mixed at the upper end portion, and therefore, when the content state of the magnetic particles is inspected by, for example, image inspection of the molded surface fastener, it can be easily and stably confirmed that the magnetic particles are appropriately contained in the left and right magnetic wall portions (particularly, the upper end portions of the magnetic wall portions).

Further, by forming the molding surface fastener so that the left and right magnetic wall portions are disposed at positions inside the left and right outer wall portions, the distance between the left and right magnetic wall portions can be easily made smaller than the distance between the left and right resin-intrusion prevention wall portions in the molding surface fastener of patent document 1 (see fig. 16) described above. Therefore, even when a magnet having a reduced width is used in a mold used for foam molding of the cushion body, for example, both the left and right magnetic wall portions of the molding surface fastener can be stably attracted by the elongated magnet of the mold, and therefore, the molding surface fastener can be stably attached to the fastener attachment surface of the mold without causing displacement of the molding surface fastener with respect to the fastener attachment surface of the mold. In addition, this also makes it possible to stably prevent the foamed resin material from entering the engagement region formed by the plurality of engagement elements during the foam molding due to the molding surface connector being displaced with respect to the connector mounting surface of the mold.

In the molded surface fastener of the present invention, the left and right magnetic wall portions have a mixing region formed by mixing the 1 st synthetic resin containing substantially no magnetic particles and the 2 nd synthetic resin containing magnetic particles at a predetermined ratio between the upper end portion and the base portion of the magnetic wall portion. Thereby, the 1 st synthetic resin and the 2 nd synthetic resin are mixed, and a boundary portion between the 1 st synthetic resin and the 2 nd synthetic resin is formed vaguely (indistinctly).

This can significantly improve the adhesion between the portion of the molded surface fastener made of the 2 nd synthetic resin containing the magnetic particles and the portion of the molded surface fastener made of the 1 st synthetic resin containing substantially no magnetic particles. Therefore, even when the molded surface fastener is subjected to a large tensile force when the molded surface fastener is peeled off from the die wheel in the molding step of the molded surface fastener, for example, cracks and fissures are less likely to occur in the molded surface fastener, and as a result, the production efficiency, yield, and the like of the molded surface fastener can be improved.

In the present invention, the base portion of the molded surface fastener has a recessed portion which is recessed in the upper surface portion of the base portion and is disposed between each of the outer wall portions and each of the magnetic wall portions and between the engaging element and each of the magnetic wall portions. Thus, when the molded surface fastener is manufactured by molding at the die wheel as described above, the 2 nd synthetic resin containing the magnetic particles can be effectively prevented or inhibited from leaking to the outer wall portions, the engaging elements, and the like beyond the left and right recessed portions provided in the respective magnetic wall portions.

In this case, the recessed groove portions provided on both the left and right sides of the magnetic wall portion have a constant groove depth from the upper surface of the base portion, and are recessed continuously in the longitudinal direction. This can suppress or prevent the 2 nd synthetic resin containing the magnetic particles from leaking from the magnetic wall portion to the outer wall portion, the engaging element, and the like over the entire longitudinal direction of the molded surface fastener.

In the present invention, the groove portion provided in each magnetic wall portion includes an inner groove portion disposed at a position closer to the engaging element than the magnetic wall portion and an outer groove portion disposed at a position closer to the outer wall portion than the magnetic wall portion. In addition, in this case, the width dimension (dimension in the width direction) of the inside groove portion and the width dimension of the outside groove portion have different sizes from each other.

For example, by making the width dimension of the outer side groove portion larger than the width dimension of the inner side groove portion, the 2 nd synthetic resin containing the magnetic particles can be more effectively prevented from leaking from the magnetic wall portion to the outer wall portion outside thereof. Further, by making the width dimension of the inner groove portion smaller than the width dimension of the outer groove portion, for example, when the molded surface connector is cut to an appropriate length dimension, in the molded surface connector after the cutting, it is possible to suppress or prevent the foamed resin from entering the engagement region from the end edge portions (the front end edge portion and the rear end edge portion) in the longitudinal direction through the inner groove portion and the gap (space portion) formed above the inner groove portion.

In the molded surface fastener of the present invention, the height dimension (dimension in the height direction) of the magnetic wall portion is the same as the height dimension of the outer wall portion. Thus, when the molding surface fastener is attached to the fastener attachment surface of the mold in the foam molding step of the cushion body, the left and right outer wall portions and the left and right magnetic wall portions of the molding surface fastener can be brought into close contact with the fastener attachment surface of the mold. This can stabilize the mounting state of the molding surface connector to the connector mounting surface of the mold. Further, since the sealing property between the molding surface fastener and the fastener mounting surface of the mold can be further improved, the foamable resin is less likely to pass over the outer wall portion and the magnetic wall portion of the molding surface fastener, and the foamable resin can be more effectively prevented from entering the engagement region of the molding surface fastener.

The magnetic wall portion has a plurality of magnetic wall bodies intermittently arranged at a predetermined pitch along the longitudinal direction. This can significantly improve the flexibility of the molded surface fastener, as compared with a case where the magnetic wall portion is formed of a continuous vertical wall portion continuously arranged at a constant height in the longitudinal direction, for example.

In the present invention, each of the magnetic wall bodies has the above-described mixing region, and the mixing region of each of the magnetic wall bodies is disposed to be offset to one side in the longitudinal direction of the forming surface fastener (for example, the front side in the machine direction). Thus, even if the molded surface fastener receives a pulling force from various directions, the magnetic wall body can be made less likely to be cracked or cracked.

The dimension of the magnetic wall in the width direction is 1 to 6 times the size of the average particle diameter of the magnetic particles. This allows the magnetic particles to be stably contained in the magnetic wall portion. In addition, the molded surface fastener can have appropriate flexibility.

In addition, the molding surface fastener is formed so that at least a part of the upper surface of the left magnetic wall portion and at least a part of the upper surface of the right magnetic wall portion can be brought into contact with a magnet attached and fixed to the molding die in a state where the molding surface fastener is attached to the molding die of the cushion body to be integrated with the molding surface fastener. Thus, the molding surface fastener of the present invention can be stably fixed to a predetermined position of the molding die by magnetic force.

Next, in a method for manufacturing a molded surface fastener according to the present invention, a molding device is used for manufacturing a molded surface fastener by ejecting a 1 st synthetic resin from a 1 st ejection port of an extrusion nozzle and ejecting a 2 nd synthetic resin from a 2 nd ejection port of the extrusion nozzle, the molding device including: a die wheel rotating in one direction; and an extrusion nozzle for ejecting a 1 st synthetic resin substantially not containing magnetic particles and a 2 nd synthetic resin containing magnetic particles at a predetermined ratio toward the die wheel in a molten state.

In this case, in the manufacturing method of the present invention, at least the upper end portions of the left and right outer wall portions are formed of only the 1 st synthetic resin substantially not containing the magnetic particles. Further, left and right magnetic wall portions disposed at positions between the outer wall portion in the width direction and the engaging elements along the longitudinal direction are formed on the upper surface of the base portion, and at least upper end portions of these magnetic wall portions are formed only of the 2 nd synthetic resin containing magnetic particles at a certain ratio.

According to the manufacturing method of the present invention, the left and right magnetic wall portions can be formed in a simple shape that is different from the shape of the left and right outer wall portions and that facilitates filling of the 2 nd synthetic resin into the cavity provided in the magnetic wall portion of the die wheel. This makes it possible to stably form the magnetic wall portion into a predetermined shape and also to prevent (or prevent) the second synthetic resin from leaking to other portions due to a defective filling of the cavity with the second synthetic resin. Therefore, according to the manufacturing method of the present invention, it is possible to stably manufacture the molded surface fastener as described above, the molded surface fastener including: a left and right magnetic wall portion having a predetermined shape, at least an upper end portion of which is formed of a 2 nd synthetic resin; and a left and right outer wall portion and a plurality of engaging elements each having a predetermined shape and an appropriate strength, wherein the leakage of the 2 nd synthetic resin to the outer wall portion and the plurality of engaging elements is suppressed (or prevented).

In the above-described manufacturing method of the present invention, the die wheel is formed by overlapping a plurality of annular laminated plates in the rotation axis direction, and a plurality of 1 st laminated plates having a constant radius and a plurality of 2 nd laminated plates having a constant radius larger than the radius of the 1 st laminated plate are used as the laminated plates of the die wheel.

In this case, a set of two 2 nd laminated plates is used for each 2 nd ejection port, and the set of 2 nd laminated plates is arranged such that the 2 nd ejection port is arranged between the set of 2 nd laminated plates. Thus, the 1 st synthetic resin is ejected from the 1 st ejection port of the extrusion nozzle toward the die wheel having the 1 st laminated plate and the 2 nd laminated plate, and the 2 nd synthetic resin is ejected from the 2 nd ejection port of the extrusion nozzle toward the die wheel having the 1 st laminated plate and the 2 nd laminated plate, whereby the molding surface connector provided with the groove portions on both the left and right sides of the magnetic wall portion can be stably manufactured while suppressing or preventing the 2 nd synthetic resin containing the magnetic particles from leaking to the outer wall portion, the engaging element, and the like.

Drawings

Fig. 1 is a perspective view showing a forming surface connector according to embodiment 1 of the present invention.

Figure 2 is a top view of a forming surface connector.

Fig. 3 is a sectional view taken along the line III-III shown in fig. 2.

Fig. 4 is a sectional view taken along lines iv (a) to iv (e) in fig. 2.

Fig. 5 is a schematic view schematically showing a manufacturing apparatus for forming a surface fastener.

Fig. 6 is a schematic view schematically showing the form of a die wheel for molding the molding surface fastener.

Fig. 7 is a schematic view schematically showing a positional relationship of an extrusion port of an extrusion nozzle disposed in a manufacturing apparatus.

Figure 8 is a schematic representation of the 1 st and 2 nd laminates of the die wheel.

Fig. 9 is a cross-sectional view schematically showing a state in which a molding surface connector is attached to a connector attachment surface of a mold and foam molding of a cushion body is performed.

Fig. 10 is a perspective view showing a forming surface connector according to a modification of example 1.

Fig. 11 is a perspective view showing a forming surface connector according to example 2 of the present invention.

Figure 12 is a cross-sectional view of a forming side connection.

Fig. 13 is a perspective view showing a forming surface connector according to example 3 of the present invention.

Figure 14 is a top view of a forming surface connector.

Fig. 15 is a cross-sectional view taken along line XV-XV shown in fig. 14.

Fig. 16 is a perspective view showing a conventional molded surface fastener.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings by referring to examples. The present invention is not limited to the embodiments described below, and various modifications can be made as long as the present invention has substantially the same configuration and the same operational effects as those of the present invention. For example, in the present invention, the length and width of the forming surface fastener, the number, arrangement position, formation density, and the like of the engaging elements arranged at the base of the forming surface fastener are not particularly limited, and can be arbitrarily changed.