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 武川诚 福原义行 山下浩行 幸恭一 于 2020-03-27 设计创作，主要内容包括：本发明提供能够相对于圈构件稳定地具备较大的卡合强度的成形面连接件和成形面连接件的制造方法。本发明的成形面连接件(1、2)具有基材部(10)和多个卡合元件(11、21),该多个卡合元件(11、21)具备杆部(12、22)和卡合部(13、23),成形面连接件(1、2)由含有0.15wt％以上且1.00wt％以下的润滑剂的合成树脂形成。卡合元件(11、21)的顶端面(13a、22a)平坦地形成,卡合部(13、23)具有朝向基材部(10)向斜下方垂下的下垂部(15、25)。(The invention provides a forming surface connector and a manufacturing method of the forming surface connector, wherein the forming surface connector can stably have high clamping strength relative to a ring member. The molded surface fastener (1, 2) of the present invention has a base material portion (10) and a plurality of engaging elements (11, 21), wherein the plurality of engaging elements (11, 21) have stem portions (12, 22) and engaging portions (13, 23), and the molded surface fastener (1, 2) is formed from a synthetic resin containing 0.15 wt% or more and 1.00 wt% or less of a lubricant. The distal end surfaces (13a, 22a) of the engaging elements (11, 21) are formed flat, and the engaging portions (13, 23) have hanging portions (15, 25) that hang obliquely downward toward the base portion (10).)

1. A molding surface fastener (1, 2) made of synthetic resin, having a base (10) and a plurality of engaging elements (11, 21) provided upright on the base (10), each engaging element (11, 21) having: a rod part (12, 22) rising from the base material part (10); and engaging parts (13, 23) integrally formed at the upper end parts of the rod parts (12, 22) and including parts extending outward relative to the outer peripheral edges of the upper end parts of the rod parts (12, 22) in a plan view of the engaging elements (11, 21), the forming surface connector being characterized in that,

the synthetic resin contains 0.15 wt% to 1.00 wt% of a lubricant,

the tip end surfaces (13a, 22a) of the engaging elements (11, 21) are formed flat,

the engaging portions (13, 23) have hanging portions (15, 25) that hang obliquely downward toward the base material portion (10).

2. The forming side connection of claim 1,

the engaging portion (13) has: an engaging portion main body (14) having a shape that expands outward from the entire outer periphery of the upper end portion of the rod portion (12); and at least 1 claw part (15) protruding from the outer peripheral edge part of the engagement part main body (14),

a tip end surface (13a) of the engaging portion main body (14) is formed flat as the tip end surface (13a) of the engaging element (11),

the hanging part (15) is provided at least in a part of the claw part (15).

3. The forming side connection of claim 1,

the engaging portion (23) has at least 1 claw portion (25) protruding from the outer peripheral side surface of the rod portion (22),

a tip end surface (22a) of the rod portion (22) is formed flat as the tip end surface (22a) of the engaging element (21),

the hanging part (25) is provided at least in a part of the claw part (25).

4. A forming side connection according to any one of claims 1 to 3,

the lubricant is a fatty acid amide-based lubricant.

5. A forming side connection according to any one of claims 1 to 4,

the main component of the synthetic resin is polypropylene.

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

the angle of inclination (theta) at which the hanging-down portions (15, 25) hang down in the height direction of the rod portions (12, 22) is 20 DEG to 80 deg.

7. A method for manufacturing a molded surface fastener (1, 2) made of synthetic resin, the molded surface fastener (1, 2) made of synthetic resin having a base (10) and a plurality of engaging elements (11, 21) provided upright on the base (10), each engaging element (11, 21) having: a rod part (12, 22) rising from the base material part (10); and an engaging portion (13, 23) integrally formed at an upper end portion of the rod portion (12, 22) and including a portion extending outward with respect to an outer peripheral edge of the upper end portion of the rod portion (12, 22) in a plan view of the engaging element (11, 21), the method for manufacturing the molded surface fastener being characterized in that,

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

a preparation step of preparing a composition in which 0.15 wt% to 1.00 wt% of a lubricant is added to a thermoplastic resin;

a primary molding step of melting the composition to mold a primary molded body (16) having the base material portion (10) and a plurality of primary elements (17) provided upright on the base material portion (10); and

and a secondary forming step of forming the forming surface connectors (1, 2) by bringing a secondary forming roller (37a) into contact with the upper end portion of the primary element (17) formed in the primary forming step, wherein the forming surface connectors (1, 2) are formed so that the distal end surfaces (13a, 22a) of the engaging elements (11, 21) are flat, and the engaging portions (13, 23) have hanging portions (15, 25) that hang obliquely downward toward the base material portion (10).

Technical Field

The present invention relates to a molded surface fastener in which a plurality of engaging elements are provided upright on a base material portion, and a method for manufacturing the molded surface fastener.

Background

Conventionally, a surface fastener product has been known in which a female surface fastener (hereinafter referred to as a "ring member") having a plurality of rings (loops) and a male molded surface fastener which is attachable to and detachable from the ring member are combined in pairs. In the male molded surface fastener, for example, a plurality of engaging elements having a hook-like or mushroom-like shape are erected on the upper surface of a flat plate-like base material portion.

A surface fastener product having such a male molded surface fastener is currently widely used for various products, for example, products to be attached to and detached from the body such as a disposable diaper, a diaper cover for infants, a protector for protecting joints of hands and feet, a waist tightening garment (a lumbago belt), and gloves.

In addition, many forming surface fasteners used for disposable diapers and the like have been developed, and for example, international publication No. 2017/109902 (patent document 1) discloses one example thereof.

The molded surface fastener described in patent document 1 includes a thin plate-like base portion and a plurality of engaging elements provided upright on an upper surface of the base portion. Each of the engaging elements has: a rod part rising from the base material part; and a disk-shaped engaging head integrally formed at an upper end of the rod portion. The engaging head portion is provided with a plurality of minute claw portions protruding from an outer peripheral edge portion of the engaging head portion, and each claw portion is formed so as to be inclined or bent downward toward the base portion of the molding surface fastener.

According to the molding surface fastener provided with the plurality of engaging elements having the claw portions, the loops of the loop member can be easily hooked to the respective engaging elements, and the hooked loops can be made less likely to be disengaged from the engaging elements. This can effectively improve the engagement strength (peel strength) of the molded surface fastener with respect to the ring member. Therefore, when the molding surface fastener of patent document 1 is used for a commodity such as a disposable diaper, for example, even if various operations are performed in a state where the molding surface fastener and the loop member are joined, the joined state can be stably maintained.

Further, in patent document 1, since the claw portion contributing to increase of the engagement strength is formed in a minute size at the outer peripheral edge portion of the engagement head portion, the influence of the claw portion on the contact comfort of the molded surface fastener can be reduced. As a result, the surface fastener having high engaging strength and a good surface texture can be provided.

Disclosure of Invention

Problems to be solved by the invention

In the case of manufacturing the molding surface fastener of patent document 1 as described above, first, as a primary molding step, a primary molded body having a thin plate-like base material portion and a plurality of temporary elements (primary elements) erected on the base material portion is molded by continuously extruding a molten thermoplastic resin toward the outer peripheral surface portion of a rotating die wheel. In this case, the temporary element has: a primary rod part rising from the base material part; a rib portion rising from an upper surface of the primary shaft portion; and a protruding portion protruding from a side edge portion of the rib portion to an outside of the primary rod portion.

Thereafter, the primary molded body having the plurality of temporary elements is conveyed toward the heating and pressing device that performs the secondary molding process, and is introduced between the pair of upper and lower rollers of the heating and pressing device. In this secondary molding step, the primary molded body is passed between the pair of upper and lower rollers, and the upper end portion of the temporary element is pressed from above by the upper roller to deform the temporary element, thereby molding the engaging element having the claw portion inclined or bent downward as described above.

However, in patent document 1, even if the profile fastening is manufactured by performing the above-described primary molding step and secondary molding step, there is a possibility that: the claw portion of the engaging element is not appropriately inclined or bent downward, but is formed to protrude substantially parallel to the base material portion, for example. When the claw portion protrudes so as to be substantially parallel to the base portion, the effect of the above-described ring not being easily disengaged from the engaging element is considered to be reduced.

The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a molded surface fastener which can stably provide a large engagement strength (peel strength) with respect to a ring member, and a method for manufacturing such a molded surface fastener.

Means for solving the problems

In order to achieve the above object, a molding surface fastener according to the present invention is a molding surface fastener made of synthetic resin, including a base portion and a plurality of engaging elements provided upright on the base portion, each of the engaging elements including: a rod portion rising from the base material portion; and an engaging portion integrally formed at an upper end portion of the rod portion and including a portion extending outward with respect to an outer peripheral edge of the upper end portion of the rod portion in a plan view of the engaging element, wherein the synthetic resin contains 0.15 wt% or more and 1.00 wt% or less of a lubricant, a tip end surface of the engaging element is formed flat, and the engaging portion has a hanging portion hanging obliquely downward toward the base material portion.

In the molded surface fastener according to the present invention, it is preferable that the engaging portion includes: an engaging portion body having a shape expanding outward from the entire outer periphery of the upper end portion of the rod portion; and at least 1 claw portion protruding from an outer peripheral edge portion of the engaging portion main body, a tip end surface of the engaging portion main body being formed flat as the tip end surface of the engaging element, the hanging portion being provided at least a part of the claw portion.

Further, the engaging portion may have at least 1 claw portion protruding from an outer peripheral side surface of the rod portion, a tip end surface of the rod portion may be formed flat as the tip end surface of the engaging element, and the hanging portion may be provided at least in part of the claw portion.

In the molded surface fastener of the present invention as described above, preferably, the lubricant is a fatty acid amide-based lubricant.

In addition, it is preferable that the main component of the synthetic resin is polypropylene.

Preferably, the angle of inclination of the hanging portion with respect to the height direction of the rod portion is 20 ° or more and 80 ° or less.

Next, a method for manufacturing a molded surface fastener according to the present invention is a method for manufacturing a molded surface fastener made of a synthetic resin, the molded surface fastener made of a synthetic resin having a base portion and a plurality of engaging elements provided upright on the base portion, each engaging element having: a rod portion rising from the base material portion; and an engaging portion integrally formed at an upper end portion of the rod portion and including a portion extending outward with respect to an outer peripheral edge of the upper end portion of the rod portion in a plan view of the engaging element, wherein the method for manufacturing the molded surface fastener is characterized by including: a preparation step of preparing a composition in which 0.15 wt% to 1.00 wt% of a lubricant is added to a thermoplastic resin; a primary molding step of melting the composition to mold a primary molded body having the base portion and a plurality of primary elements provided upright on the base portion; and a secondary forming step of forming the forming surface connector by bringing a secondary forming roller into contact with an upper end portion of the primary element formed in the primary forming step, wherein a tip end surface of the engaging element is formed flat and the engaging portion has a hanging portion hanging obliquely downward toward the base material portion.

ADVANTAGEOUS EFFECTS OF INVENTION

In the present invention, the synthetic resin forming the molded surface connector contains 0.15 wt% to 1.00 wt% of a lubricant. By performing a primary molding step of molding a primary molded body having, for example, a plurality of primary elements (temporary elements) using the synthetic resin containing the lubricant as described above, and then performing a secondary molding step of pressing the upper end portion of the primary element with a secondary molding roller on the obtained primary molded body, the distal end surface of the engaging element can be formed flat and parallel to the 1 st surface (upper surface) of the base material portion. In addition, in the secondary molding step, since the frictional resistance between the primary molded body and the secondary molding roller can be reduced, a hanging portion that hangs obliquely downward toward the base material portion can be easily formed in at least a part of the engagement portion provided in the engagement element.

Therefore, in the molded surface fastener of the present invention produced by performing the secondary molding step, the tip end surface of each engaging element is flat, and therefore, a good skin feel can be obtained on the 1 st surface (upper surface) of the molded surface fastener on which the engaging element is provided. Further, since the hanging portion as described above is provided in the engaging portion of the engaging element, when the loop member is engaged with the molding surface fastener, the loop of the loop member can be hooked on the hanging portion of the engaging element and is not easily detached from the engaging element. Therefore, the molded surface connector of the present invention can have high engagement strength (peel strength) with respect to the ring member.

In the molded surface fastener of the present invention, the engaging portion includes: an engaging portion main body integrally extending outward from an outer peripheral edge of an upper end portion of the rod portion in a plan view of the engaging element; and at least 1 claw part protruding from the outer peripheral edge part of the clamping part main body. In this case, the distal end surface of the engaging portion main body is formed flat, and the hanging portion is provided at least in part of the claw portion. With such a configuration of the engaging element, the molding surface fastener of the present invention can stably combine the above-described good texture and high engaging strength.

In the molding surface fastener of the present invention, the engaging portion may have at least 1 claw portion protruding from an outer peripheral side surface of the rod portion, the tip end surface of the rod portion may be formed flat, and the hanging portion may be provided at least in part of the claw portion. Even in the molded surface fastener of the present invention, good touch and high engaging strength can be stably combined.

In the present invention, the lubricant contained in the synthetic resin is a fatty acid amide-based lubricant, and preferably at least 1 selected from the group consisting of stearic acid amide, oleic acid amide, erucic acid amide, methylene bis stearic acid amide, and ethylene bis stearic acid amide. By adding such a fatty acid amide-based lubricant to the synthetic resin, when the primary molded body is pressed by the secondary molding roller in the secondary molding step, the frictional resistance between the primary molded body and the secondary molding roller can be effectively reduced, and therefore, the engaging portion of each engaging element can stably have the drooping portion as described above.

Polypropylene is used as a main component of the synthetic resin forming the molded surface fastener. The main component herein means a component that occupies the highest proportion in the entire molded surface fastener. In particular, in the present invention, it is preferable that 90 wt% or more, preferably 95 wt% or more of the material forming the molding surface fastener is polypropylene. Thus, the engaging element of the forming surface connector can stably have a flat tip surface and a hanging portion provided to the engaging portion.

In the present invention, the angle of inclination at which the hanging portion of the engaging portion hangs down with respect to the height direction of the rod portion is 20 ° or more and 80 ° or less. This effectively increases the engagement strength of the molded surface fastener with the ring member.

Next, in the method for manufacturing a molded surface fastener of the present invention, the following steps are performed: a preparation step of preparing a composition in which 0.15 wt% to 1.00 wt% of a lubricant is added to a thermoplastic resin; a primary molding step of melting the composition to mold a primary molded body having a base material portion and a plurality of primary elements; and a secondary forming step of forming the molded surface fastener by bringing the secondary forming roller into contact with the upper end portion of the molded primary element.

In this case, in the primary molding step, the lubricant-containing composition is discharged toward the rotating die wheel to mold a primary molded body, and the primary molded body has a primary element including: a primary rod part rising from the base material part; a rib portion rising from an upper surface of the primary shaft portion; and a protruding portion protruding from the rib portion to an outside of the primary rod portion.

After that, the obtained primary molded body is subjected to a secondary molding step, whereby the distal end surface of the engaging element can be formed flat. Further, since the synthetic resin of the primary molded body contains the lubricant at a predetermined ratio, the frictional resistance generated when the secondary molding roller and the primary molded body come into contact can be reduced, and thus a hanging-down portion hanging down obliquely downward toward the base material portion can be stably formed at least in a part of the engagement portion provided in the engagement element. As a result, the molded surface fastener of the present invention can be manufactured smoothly.

Drawings

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

Fig. 2 is a front view of the engaging element of the forming surface connector shown in fig. 1, as viewed from the front-rear direction.

Fig. 3 is a schematic view schematically showing an apparatus for manufacturing the forming surface connecting member shown in fig. 1.

Fig. 4 is a perspective view schematically showing an outer cylindrical body and an inner cylindrical body of the molding device shown in fig. 3.

Fig. 5 is a perspective view showing a main part of a primary molded body obtained from a molding apparatus.

Fig. 6 is a front view of the engaging element of the forming surface fastener according to embodiment 2 of the present invention, as viewed from the front-rear direction.

Description of the reference numerals

1. 2, forming surface connecting pieces; 10. a base material portion; 11. a snap-fit element; 12. a rod portion; 12a, a boundary portion; 13. a fastening part; 13a, a tip end face (upper surface); 14. a fastening portion main body; 15. a claw portion (a hanging-down portion); 16. a primary molded body; 17. a primary element (temporary element); 17a, a primary rod portion; 17b, ribs; 17c, a protruding portion (temporary claw portion); 21. a snap-fit element; 22. a rod portion; 22a, a tip end face (upper surface); 23. a fastening part; 25. a claw portion (a hanging-down portion); 30. a manufacturing device; 31. a forming device; 32. a die wheel; 32a, an outer cylindrical body (outer sleeve); 32b, an inner cylindrical body (inner sleeve); 32c, a driving part; 32d, through holes; 32e, groove portion; 33. an extrusion nozzle; 34. a pickup roller; 34a, an upper nip roller; 34b, a lower side nip roller; 36. a pressing device; 37a, 37b, secondary forming rolls (reduction rolls); θ, angle of inclination (claw projection angle).

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 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 structure and the same operational effects as those of the present invention. For example, in the following embodiments, the number, size, arrangement position, formation density, and the like of the engaging elements provided in the molded surface fastener are not particularly limited, and can be arbitrarily changed.

(embodiment 1)

Fig. 1 is a perspective view showing a main part of a forming surface fastener according to embodiment 1, and fig. 2 is a front view of an engaging element of the forming surface fastener as viewed from the front-rear direction.

In the following description, the longitudinal direction of the molding surface fastener and the primary molded body is the longitudinal direction of the molding surface fastener and the primary molded body molded to be elongated as described later, and the longitudinal direction refers to the direction along the mechanical direction (M direction or MD) in which the molding surface fastener or the primary molded body flows in the manufacturing process of the molding surface fastener.

The left-right direction is a width direction perpendicular to the longitudinal direction and along the upper surface (or lower surface) of the base portion of the molding surface fastener. In this case, the left-right direction and the width direction can also be referred to as a perpendicular direction (C direction or CD) perpendicular to the Machine Direction (MD). The vertical direction (thickness direction) is a height direction perpendicular to the longitudinal direction and perpendicular to the upper surface (or lower surface) of the base portion of the molding surface fastener.

As will be described later, by molding a thermoplastic resin using a manufacturing apparatus 30 having a molding apparatus 31 and a pressing apparatus 36, the molded surface fastener 1 of embodiment 1 shown in fig. 1 is manufactured so as to be a rectangular sheet shape that is long in the Machine Direction (MD) of the manufacturing apparatus 30 in a plan view. The length (dimension in the longitudinal direction) and the width (dimension in the width direction) of the molded surface fastener 1 of the present invention are not particularly limited. The molded surface fastener 1 may have a shape other than a rectangular shape in a plan view.

The molded surface fastener 1 according to embodiment 1 contains polypropylene as a main component, and is formed of a synthetic resin containing a lubricant in a proportion of 0.15 wt% or more and 1.00 wt% or less.

More specifically, in embodiment 1, the synthetic resin forming the molded surface fastener 1 contains polypropylene at a ratio of 90 wt% or more, preferably 95 wt% or more. By thus containing polypropylene as a main component (main agent) in the material of the molding surface fastener 1, the engaging element 11 of the molding surface fastener 1, which will be described later, can be easily molded into a predetermined shape in which a hanging portion is formed in the engaging portion 13. Further, since polypropylene has a small specific gravity, the weight of the molded surface fastener 1 can be reduced.

The synthetic resin according to embodiment 1 contains a fatty acid amide lubricant as a lubricant. As the fatty acid amide-based lubricant, for example, stearic acid amide, oleic acid amide, erucic acid amide, methylene bis stearic acid amide, and ethylene bis stearic acid amide are suitably used. These fatty acid amides may be used alone in 1 kind, or may be used in plural kinds at the same time.

By containing the fatty acid amide-based lubricant in an amount of 0.15 wt% or more in the synthetic resin of the molding surface fastener 1, friction inside the synthetic resin can be reduced, and friction between a device, a machine, and a molded body during molding can be reduced. As a result, as will be described later, the upper end portion of the primary element 17 is pressed by the secondary forming roller 37a at a predetermined heating temperature in the secondary forming step, whereby the hanging claw portion 15 can be stably formed in the engagement portion 13 of the engagement element 11. On the other hand, by containing the fatty acid amide-based lubricant in an amount of 1.00 wt% or less, the engaging element 11 having a predetermined shape can be stably formed while securing the form stability at the time of molding. In addition, the strength of the molded surface fastener 1 can be appropriately secured.

In the present invention, instead of the polypropylene, a thermoplastic resin such as polyester, nylon, polybutylene terephthalate, or a copolymer thereof may be contained as a main component in the synthetic resin forming the molded surface fastener 1. Further, as the lubricant, a fatty acid amide-based lubricant other than the above-described fatty acid amide, a lubricant other than the fatty acid amide-based lubricant such as a hydrocarbon-based lubricant, a higher alcohol-based lubricant, a metal soap-based lubricant, or an ester-based lubricant can be used. The synthetic resin of the molded surface fastener 1 may further contain an inorganic substance such as titanium oxide, an additive other than a lubricant, and the like.

The forming surface fastener 1 of embodiment 1 includes a thin flat plate-like base material portion 10 and a plurality of engaging elements 11 provided upright on the upper surface of the base material portion 10. The base material portion 10 is formed to have a predetermined thickness, and an upper surface (1 st surface) and a lower surface (2 nd surface) thereof are formed in a flat and mutually parallel manner.

The plurality of engaging elements 11 are arranged along the Machine Direction (MD) and the orthogonal direction (CD) of the forming surface fastener 1. In the present invention, the arrangement of the engaging elements 11 is not limited to the above, and for example, the plurality of engaging elements 11 may be arranged in another arrangement pattern such as a zigzag pattern or may be arranged randomly.

Each engaging element 11 has: a stem portion 12 rising from the base portion 10; and an engaging portion 13 (also referred to as an engaging head) integrally formed at an upper end portion of the rod portion 12 and extending in a direction orthogonal to the height direction. The rod portion 12 has a truncated cone shape in which the cross-sectional area perpendicular to the vertical direction increases as the base portion 10 approaches. In the present invention, the shape of the stem portion is not limited to the truncated cone shape.

The engaging portion 13 of the engaging element 11 includes: an engaging portion body 14 (also referred to as a head body) having a disk-like or dish-like shape extending outward from the entire periphery of the outer periphery of the upper end portion of the rod portion 12; and two minute claw portions 15 provided to protrude from the outer peripheral side surface of the engaging portion main body 14.

The engaging portion body 14 extends outward from the position of the outer peripheral edge of the upper end portion of the rod portion 12 (or the boundary portion 12a between the rod portion 12 and the engaging portion 13), and has a circular shape in a plan view of the engaging element 11 from above. The engaging portion main body 14 includes a distal end surface (upper surface) 13a that is disposed parallel to the upper surface of the base material portion 10 and is formed flat, and the distal end surface 13a is formed by pressing the upper end portion of the primary element 17 by a secondary forming roller 37a in a secondary forming step described later. Such a distal end surface 13a is formed flat and parallel to the upper surface of the base material portion 10, and the skin touch on the upper surface side of the molding surface fastener 1 can be improved.

The back surface of the engaging portion 13 is disposed on the opposite side of the distal end surface 13a of the engaging portion main body 14 so as to face the base material portion 10. The back surface of the engaging portion main body 14 is formed to extend while being bent from the outer peripheral edge of the upper end portion of the rod portion 12 toward the outer peripheral edge of the engaging portion main body 14. A curved outer peripheral side surface is arranged from the outer peripheral portion of the distal end surface 13a of the engaging portion main body 14 to the rear surface of the engaging portion main body 14.

Each engaging element 11 has a pair of left and right claw portions 15 protruding outward from the outer peripheral side surface of the engaging portion main body 14. In particular, in embodiment 1, the two claw portions 15 are disposed in a point-symmetric positional relationship with each other in a plan view of the engaging element 11, and are provided so as to protrude from the outer peripheral side surface of the engaging portion main body 14 in opposite directions to each other in the left-right direction (C direction).

As shown in fig. 2, the left and right claw portions 15 are formed to hang obliquely downward from the proximal end portion connected to the engaging portion main body 14 toward the distal end portion in the protruding direction so as to approach the base portion 10, and each claw portion 15 is formed as a hanging portion of the engaging portion 13 in the present invention. In embodiment 1, the hanging portion of the engaging portion 13 may be formed not only by the claw portion 15 as in embodiment 1 but also by partially hanging the outer peripheral edge portion of the engaging portion main body 14 obliquely downward.

The claw portion 15 is formed in such a minute size that a claw width dimension (an interval between claw side wall surfaces) at the base end portion of the claw portion 15 becomes 1/3 or less, preferably 1/5 or less, and more preferably 1/7 or less of a dimension in the M Direction (MD) at the outer periphery of the upper end portion of the lever portion 12.

As shown in fig. 2, the claw portion (hanging portion) 15 of the engaging portion 13 is formed so that an inclination angle (claw projecting angle) θ that hangs obliquely downward with respect to the height direction (vertical direction) of the lever portion 12 is 20 ° or more and 80 ° or less.

Here, the inclination angle (claw projection angle) θ of the claw portion 15 is an angle at which the lower surface (back surface) or the upper surface (outer surface) of the claw portion 15 is inclined with respect to the height direction when the engaging element 11 is viewed from a direction parallel to the upper surface of the base material portion 10 (a direction orthogonal to the height direction of the engaging element 11), for example, and is preferably an angle at which the lower surface of the claw portion 15 is inclined with respect to the downward direction. For example, when the lower surface or the upper surface of the claw portion 15 is formed as a curved surface, the inclination angle θ of the claw portion 15 is an angle at which a virtual straight line connecting the lower surface (or the upper surface) of the base end portion and the lower surface (or the upper surface) of the tip end portion of the claw portion 15 at the shortest distance is inclined with respect to the downward direction.

By setting the inclination angle θ to 20 ° or more, when the loop member is engaged with the molded surface fastener 1, the loop of the loop member can be easily hooked and engaged under the hook portion 15. On the other hand, when the inclination angle θ is 80 ° or less, the ring engaged with the engaging element 11 can be made less likely to be disengaged from the claw portion 15.

Next, a method of manufacturing the molded surface fastener 1 of embodiment 1 will be described.

The profile joint 1 is manufactured using the manufacturing apparatus 30 shown in fig. 3. The manufacturing apparatus 30 includes: a molding device 31 for performing a primary molding step; and a pressing device 36 that performs a secondary molding step in which the primary molded body 16 molded in the primary molding step is pressed and molded.

The forming device 31 has: a die wheel 32 that rotates in one direction (counterclockwise in the drawing); an extrusion nozzle 33 disposed to face the outer peripheral surface of the die wheel 32 and configured to discharge a composition (synthetic resin material) described later in a molten state; and a pickup roller 34 disposed on the downstream side of the extrusion nozzle 33 in the rotational direction of the die wheel 32.

The die wheel 32 is formed substantially in the same manner as the die wheel described in patent document 1. Briefly described, the die wheel 32 includes: a cylindrical outer cylindrical body (outer sleeve) 32a serving as a mold; a cylindrical inner cylindrical body (inner sleeve) 32b disposed inside the outer cylindrical body 32a so as to be in close contact with the outer cylindrical body 32 a; and a driving portion 32c that rotates the outer cylindrical body 32a and the inner cylindrical body 32 b.

As shown in fig. 4, the outer cylindrical body 32a is provided with a plurality of through holes 32d penetrating from the outer peripheral surface to the inner peripheral surface of the outer cylindrical body 32a as a cavity for molding a primary rod portion 17a of the primary molded body 16, which will be described later. The outer peripheral surface of the inner cylindrical body 32b is concavely provided with a plurality of groove portions 32e along a C Direction (CD) parallel to the central axis of the cylinder of the inner cylindrical body 32 b. The groove portion 32e has a groove width and a groove depth into which the molten composition can flow, and is disposed so as to overlap the diameter of the through hole 32d formed in the outer cylindrical body 32 a.

By providing the through-holes 32d of the outer cylindrical body 32a and the groove portions 32e of the inner cylindrical body 32b in the positional relationship as described above, when the primary molded body 16 is molded as described below, a plurality of primary elements 17 as shown in fig. 5 can be stably and integrally formed in the base material portion 10.

The pickup roller 34 includes a pair of upper and lower pinch rollers 34a and 34b that vertically pinch the primary molded body 16 formed on the outer peripheral surface of the die wheel 32. The upper pinch roller 34a and the lower pinch roller 34b are disposed to be rotatable in a predetermined direction at a predetermined speed. Further, an unillustrated surface layer made of an elastomer such as a urethane elastomer is provided on the outer peripheral surface portion of the upper pinch roller 34a and the outer peripheral surface portion of the lower pinch roller 34 b.

The pressing device 36 has a pair of upper and lower secondary forming rollers 37a, 37b disposed downstream of the pickup roller 34. In this case, the distance between the upper and lower secondary forming rollers 37a and 37b can be adjusted by a height adjusting member, not shown. The upper secondary forming roller 37a is a pressing roller for pressing the primary element 17 of the primary formed body 16 formed in the primary forming step from above to form the primary formed body. The upper secondary forming roller 37a is internally provided with a heat source, not shown, and the roller surface temperature thereof is set to a temperature at which the composition can be softened. The lower secondary forming roller 37b is a supporting roller for supporting the primary formed body 16 from below.

When the molded surface fastener 1 is produced using the production apparatus 30 as described above, first, a composition is prepared in which a fatty acid amide-based lubricant is added to polypropylene as a main component in a proportion of 0.15 wt% to 1.00 wt%. The prepared composition is melted and continuously discharged from the extrusion nozzle 33 toward the outer peripheral surface of the die wheel 32. For example, solid polypropylene and pellets (master batch) containing polypropylene and a lubricant are mixed and melt-kneaded, and the obtained composition in a molten state is fed from an extrusion nozzle 33 to be supplied to a die wheel 32. In addition, the particles may contain other additives such as titanium oxide.

Thereby, the base material portion 10 is continuously molded between the extrusion nozzle 33 and the die wheel 32. Further, a plurality of primary elements (temporary elements) 17 as shown in fig. 5 are integrally formed on the base material portion 10 by the outer cylindrical body 32a and the inner cylindrical body 32b of the die wheel 32 at the same time. Thereby, the primary molded body 16 is formed. In this case, the base material portion 10 of the primary molded body 16 directly becomes the base material portion 10 of the molding surface fastener 1. The primary element 17 is press-molded in the secondary molding step to become the engaging element 11 of the molded surface fastener 1.

Each primary element 17 has: a truncated cone-shaped primary shaft portion 17a rising from the base material portion 10; an elongated rib 17b rising upward from an upper surface (distal end surface) of the primary lever portion 17 a; and left and right projecting portions (temporary claw portions) 17c formed continuously integrally with the rib portion 17b and projecting from the rib portion 17b to the outside of the primary lever portion 17 a. In this case, the rib 17b and the protrusion 17C are formed by flowing the molten composition from the through hole 32d of the outer cylindrical body 32a into the groove portion 32e provided in the inner cylindrical body 32b in the primary molding step, and thus the rib 17b and the protrusion 17C are formed along the C Direction (CD).

Such a primary molded body 16 is solidified by rotating with the die wheel 32 for half a revolution, and thereafter, is continuously peeled off from the outer peripheral surface portion of the die wheel 32 by the pickup roller 34.

Next, the primary molded body 16 peeled off from the die wheel 32 is conveyed to the pressing device 36 which performs the secondary molding step.

In the secondary molding step, the primary molded body 16 is introduced between the upper secondary molding roller 37a and the lower secondary molding roller 37b of the pressing device 36. At this time, the primary element 17 of the primary molded body 16 is brought into direct contact with the rotating upper secondary molding roller 37a, whereby at least the upper end portion of the primary element 17 is heated to a predetermined temperature to be softened, and is pressed from above to deform the upper end portion of the primary element 17. In particular, in embodiment 1, the rib 17b and the left and right projecting portions 17c of the primary element 17 and a part (upper end portion) of the primary rod portion 17a are deformed by the upper secondary forming roller 37 a.

Thus, the engaging portion main body 14 having the distal end surface 13a formed by flattening the outer peripheral surface of the upper secondary forming roller 37a is formed, and the left and right claw portions (hanging portions) 15 projecting in the C direction from the outer peripheral surface of the engaging portion main body 14 and hanging obliquely downward are formed. Thus, the molded surface fastener 1 according to embodiment 1 shown in fig. 1 is manufactured.

In the molded surface connector 1 of embodiment 1 manufactured as described above, the distal end surface 13a of the engaging portion 13 (i.e., the distal end surface 13a of the engaging portion main body 14) is formed as a flat surface parallel to the upper surface of the base material portion 10 by the upper secondary forming roller 37a as described above. As a result, the upper surface of the forming surface fastener 1 can be formed so as to obtain a good tactile sensation.

In embodiment 1, the molded surface fastener 1 is formed using a thermoplastic resin containing polypropylene as a main component and a fatty acid amide-based lubricant in a predetermined ratio. By adding such a lubricant, the surface of the primary molded body 16 molded in the primary molding step can be easily formed smoothly, and friction with, for example, the upper secondary molding roller 37a of the pressing device 36 can be reduced. In addition, the friction between the synthetic resin particles in the molded body can be reduced. Therefore, by press-molding the primary element 17 by the upper secondary molding roller 37a as described above, the claw portion 15 protruding from the outer peripheral side surface of the engaging portion main body 14 can be smoothly and stably formed in the form of a hanging-down portion that hangs obliquely downward so that the tip end portion thereof comes close to the base portion 10.

The two claw portions 15 protruding obliquely downward are provided in the engaging portion 13 of the engaging element 11, so that when the loop member is engaged with the molded surface fastener 1, the loop of the loop member can be made less likely to come off from the engaging element 11. Therefore, the engagement strength (peel strength) of the molded surface fastener 1 with respect to the ring member can be effectively improved.

In embodiment 1 described above, the primary molded body 16 molded on the outer peripheral surface portion of the die wheel 32 is peeled off from the die wheel 32 by the pickup roller 34, and thereafter, the primary molded body 16 is introduced between the upper secondary molding roller 37a and the lower secondary molding roller 37b, thereby performing press molding (secondary molding) on the primary molded body 16. However, in the present invention, for example, by providing a heating member or the like to the upper pinch roller of the pickup roller, the primary molded body can be peeled from the die wheel by the upper pinch roller and the lower pinch roller, and the primary molded body which has just been peeled can also be press molded (secondary molding). In this case, the molded surface fastener 1 can be manufactured without using the pressing device 36 described above.

In embodiment 1, the hook portion 15 forms a hanging portion of the engaging portion 13 provided in the engaging element 11. However, in the present invention, the hanging portion of the engaging portion may be formed continuously by both the pawl portion of the engaging portion and the engaging portion main body, or may be formed only by the engaging portion main body of the engaging portion. In addition, when the hanging portion is formed only by the engaging portion main body of the engaging portion, the engaging element can be formed without providing the claw portion in the engaging portion.

(embodiment 2)

Next, the forming surface fastener according to embodiment 2 will be described with reference to fig. 6. Fig. 6 is a front view of the engaging element of the forming surface connector viewed from the front-rear direction.

The forming surface fastener 2 according to embodiment 2 includes a thin flat plate-like base material portion 10 and a plurality of engaging elements 21 provided upright on an upper surface of the base material portion 10. In the molded surface fastener 2 of embodiment 2, the form of the engaging element 21 is different from that of the molded surface fastener 1 of embodiment 1, but the form of the base portion 10 and other structures (structure, properties, etc.) such as the material of the molded surface fastener 2 are the same. Therefore, in embodiment 2, substantially the same portions or members as those of embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The engaging element 21 of embodiment 2 includes: a truncated cone-shaped stem portion 22 rising from the base portion 10; and two minute claw portions 25 integrally formed at the upper end portion of the lever portion 22 and protruding from the outer peripheral side surface of the lever portion 22 along the left and right.

The tip surface (upper surface) 22a of the rod portion 22 is formed flat as the tip surface of the engaging element 21 in parallel with the upper surface of the base material portion 10. The engaging portion 23 of the engaging element 21 is formed by two claw portions 25 extending outward with respect to the outer peripheral edge of the upper end portion of the lever portion 22 (i.e., the outer peripheral edge of the distal end surface 22a of the lever portion 22), and the two claw portions 25 are provided so as to protrude from the outer peripheral side surface of the lever portion 22 in opposite directions to each other in the left-right direction (C direction).

The left and right claw portions 25 are formed as hanging portions of the engaging portion 23 in a form hanging obliquely downward from the proximal end portions thereof toward the distal end portions in the protruding direction so as to be close to the base portion 10. In this case, each claw portion 25 is formed so that an inclination angle (claw projection angle) θ in the downward direction with respect to the height direction of the lever portion 22 is 20 ° or more and 80 ° or less.

The molded surface fastener 2 of embodiment 2 as described above is manufactured using the manufacturing apparatus 30 shown in fig. 3 as in embodiment 1.

First, a predetermined composition is prepared as in the case of embodiment 1, and the composition is melted and discharged from the extrusion nozzle 33 toward the outer peripheral surface of the die wheel 32, thereby performing a primary molding step. Thereby, the primary molded body 16 shown in fig. 5 is molded.

Next, the obtained primary molded body 16 is conveyed to a pressing device 36 that performs a secondary molding step. In the secondary forming step of embodiment 2, the rib 17b and the left and right projecting portions 17c of the primary element 17 are brought into contact with the upper secondary forming roller 37a to deform the rib 17b and the left and right projecting portions 17c of the primary element 17. That is, in embodiment 2, the deformation of the primary rod portion 17a by the upper secondary forming roller 37a is not generated or the deformation of the primary rod portion 17a is reduced.

As a result, the stem portion 22 is formed by the primary stem portion 17a and a part of the rib portion 17b of the primary element 17, and the left and right claw portions (hanging portions) 25 are formed by the remaining part of the rib portion 17b and the left and right projecting portions 17 c. Thereby, the molded surface fastener 2 having the engaging elements 21 shown in fig. 6 is manufactured.

The same effects as those of the molded surface fastener 1 of embodiment 1 can be obtained also in the molded surface fastener 2 of embodiment 2 thus manufactured.

In embodiment 1 and embodiment 2, a case where two claw portions 15 and 25 are provided in the engaging elements 11 and 21, respectively, is described. However, in the present invention, the number of the claw portions provided to the engaging elements is not limited, and each engaging element may be formed to have 1 claw portion, or each engaging element may be formed to have a plurality of claw portions of 3 or more. In the present invention, the surface fastener can be manufactured by changing the number of the claw portions provided to each engaging element in, for example, the Machine Direction (MD), and the molded surface fastener can be manufactured so that the claw portions are not formed in some of the engaging elements.