阅读说明：本技术 用于切膜的刀具及切膜装置 (Cutter for cutting film and film cutting device ) 是由 李启东 许建勇 谢小梅 于 2019-11-13 设计创作，主要内容包括：本发明提供了一种用于切膜的刀具和切膜装置,该刀具包括两两相互连接的第一锋面、第二锋面和第一端面,所述第一锋面和所述第二锋面相交形成刀刃线,所述第一端面具有至少一平面部,所述刀刃线与所述平面部相交形成一相交点。合理设置刀具第一锋面、第二锋面和第一端面的位置关系,使得第一锋面、第二锋面和第一端面围合形成尖角,从而使得切口处发生较大的形变,以产生体积足够大的气泡,便于剥离膜。(The invention provides a cutter for cutting a film and a film cutting device, wherein the cutter comprises a first frontal surface, a second frontal surface and a first end surface which are connected in pairs, the first frontal surface and the second frontal surface are intersected to form a cutter edge line, the first end surface is provided with at least one plane part, and the cutter edge line and the plane part are intersected to form an intersection point. Rationally set up the position relation of the first frontal surface of cutter, second frontal surface and first terminal surface for first frontal surface, second frontal surface and first terminal surface enclose to close and form the closed angle, thereby make incision department take place great deformation, in order to produce the enough big bubble of volume, be convenient for peel off the membrane.)

1. The utility model provides a cutter for cut membrane, its characterized in that includes two liang of interconnect's first frontal, second frontal and first terminal surface, first frontal with the second frontal is crossing forms the cutting edge line, first terminal surface has at least a plane portion, the cutting edge line with the plane portion is crossing forms an intersection point.

2. The tool according to claim 1, wherein said edge line has at least one straight portion that intersects said planar portion to form said intersection point.

3. The tool according to claim 1, wherein the first facet is symmetrically disposed with respect to the second facet.

4. The tool according to claim 1, wherein the first end surface forms a first angle with the edge line, the first angle being equal to or less than 90 °.

5. The tool according to any one of claims 1 to 4, wherein the first facet and the second facet form a second angle, the second angle ranging from 15 ° to 25 °.

6. The tool according to any one of claims 1 to 4, wherein the tool further comprises a second end face and a back face, the second end face being disposed opposite the first end face, the second end face being either planar or curved; the back is arranged on one side, far away from the edge line, of the first frontal surface and the second frontal surface, and the back is a plane or a curved surface.

7. A film cutting device, which is characterized by comprising a knife roller, a driving device and a knife tool according to any one of claims 1 to 6, wherein the knife tool is connected with the knife roller, and the driving device drives the knife roller to rotate so as to drive the knife tool to rotate.

8. The film cutting device according to claim 7, wherein the axis of the knife roll is parallel to the film to be processed, and the axis of the knife roll is perpendicular to the edge line of the cutter.

9. The tool according to claim 8, wherein the height of the first edge and the second edge along a direction perpendicular to the axis of the knife roll and parallel to the first plane is in a range of 80 μm to 180 μm; the first plane is a plane passing through the edge line and perpendicular to the axis of the knife roller.

10. The tool according to claim 9, wherein the maximum distance between the first facet and the second facet in a direction perpendicular to the first plane is in a range of 3 μ ι η to 7 μ ι η.

Technical Field

The invention belongs to the field of machinery, and particularly relates to a cutter for cutting a film and a film cutting device with the cutter.

Background

With the improvement of the quality of life, people pay more and more attention to the screen quality of terminal products, so that more and more release films are applied to the terminal products. Generally, after the release film is produced, a protective film is needed to protect the release film. Before the release film is used on a product, the protective film needs to be peeled off.

Nowadays, in order to facilitate the peeling of the protective film, a cut is generally cut in the non-visible region of the protective film. Because the incision takes place deformation, incision department and product are in incomplete laminating state for incision department produces the bubble, so that tear the protection film.

On the premise of not influencing the visual quality, the structure of the existing film cutting tool cannot generate enough deformation at the cut so that the protective film can be smoothly peeled off.

Disclosure of Invention

An object of the present invention is to provide a cutter capable of solving the above-described problems and a film cutting apparatus including the cutter.

In order to realize the purpose of the invention, the invention provides the following technical scheme:

in a first aspect, the invention provides a cutter for cutting a film, which comprises a first frontal surface, a second frontal surface and a first end surface, wherein the first frontal surface, the second frontal surface and the first end surface are connected in pairs, the first frontal surface and the second frontal surface are intersected to form a cutter edge line, the first end surface is provided with at least one plane part, and the cutter edge line and the plane part are intersected to form an intersection point. Rationally set up the position relation of the first frontal surface of cutter, second frontal surface and first terminal surface for first frontal surface, second frontal surface and first terminal surface enclose to close and form the closed angle, thereby make incision department take place great deformation, in order to produce the enough big bubble of volume, be convenient for peel off the membrane.

In one embodiment, the edge line has at least one straight portion that intersects the planar portion to form the intersection point. Through the arrangement, the intersection point is the intersection point of the straight line and the plane, so that the intersection point is relatively sharp, and the incision is favorably deformed greatly.

In one embodiment, the first frontal surface is symmetrically disposed with respect to the second frontal surface. Through the setting, make the cutter when the cutting film, the deformation volume of membrane in incision department is the same in first frontal surface and second frontal surface both sides to restrict the incision department bubble effectively and extend, avoid the bubble of adjacent incision department to link as an organic whole and enlarge, thereby leave the bubble seal or get into the visual area on leaving the type membrane.

In one embodiment, the first face is perpendicular to the first face and the second face. Set up to vertically geometry through first terminal surface and first frontal and second frontal for first frontal can contact the membrane with the second frontal simultaneously, and the membrane takes place deformation simultaneously in the incision department of first frontal one side and second frontal one side, avoids one side to take place deformation earlier and leads to the unreasonable distribution of deformation volume.

In one embodiment, the first end surface forms a first angle with the edge line, the first angle being equal to or less than 90 °. By limiting the range of the first angle, the phenomenon that when the film is cut, the included angle between the first end face and the surface of the film is too small, the speed of the first end face extending into the film is too high, and therefore stress generated is increased sharply, and warping is easy to occur on two sides of the cut is avoided.

In one embodiment, the first front and the second front form a second angle, and the second angle is in a range of 15 ° to 25 °. Through the scope of reasonable setting second angle, restriction membrane is at the ascending deflection of incision width direction, avoids warping too big or undersize for the volume of bubble is in suitable within range, under the prerequisite that does not produce bubble seal and bubble and do not get into the visible region, can peel off the membrane smoothly.

In one embodiment, the cutter still includes second terminal surface and back, the second terminal surface with first terminal surface sets up back of the body mutually, the second terminal surface is plane or curved surface, the back set up in first frontal surface and the second frontal surface is kept away from one side of sword line, the back is plane or curved surface. Through rationally setting up back and second terminal surface on the cutter for the cutter is convenient for install on the rotor.

The second aspect comprises a knife roller, a driving device and the knife tool of the first aspect, wherein the knife tool is connected with the knife roller, and the driving device drives the knife roller to rotate so as to drive the knife tool to rotate. The preset value is set to limit the preset width, so that the cutter can generate enough deformation on the film under the condition that the first frontal surface and/or the first frontal surface is the cambered surface, and bubbles capable of meeting the film stripping requirement are generated.

In one embodiment, the axis of the knife roll is parallel to the film to be processed, and the axis of the knife roll is perpendicular to the edge line of the cutter. Through the reasonable relation that sets up the axis of rotor and the sword line of cutter for the incision is relatively even in the deflection of width direction.

In one embodiment, the heights of the first edge and the second edge along the direction perpendicular to the axis of the knife roller and parallel to the first plane are in the range of 80-180 μm; the first plane is a plane passing through the edge line and perpendicular to the axis of the knife roller. Through the scope of rationally setting up first frontal and second frontal along specific direction for the cutter fully cuts into in the membrane, is favorable to guaranteeing that the membrane can produce sufficient deflection.

In one embodiment, the maximum distance between the first front and the second front in a direction perpendicular to the first plane ranges from 3 μm to 7 μm. Through the scope of rationally setting up first frontal and second frontal along certain direction maximum distance for when the cutter cut into the membrane, guaranteed that the membrane can produce sufficient deflection, conveniently peeled off.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of a film cutting device according to an embodiment.

Fig. 2a is a schematic perspective view of a cutter according to an embodiment.

FIG. 2b is a perspective view of another perspective of the present invention.

Fig. 3a is a schematic perspective view of a film and a release film after being cut by a conventional cutter.

Fig. 3b is a top view of the film and the release film after being cut by the conventional cutter.

Fig. 4a is a schematic perspective view of a film and a release film after being subjected to film cutting by the cutter provided by the invention.

Fig. 4b is a top view of the film and the release film after being cut by the cutter provided by the invention.

FIG. 5 is a right side view of the tool in one embodiment.

FIG. 6 is a front view of a cutter in one embodiment.

FIG. 7 is a cross-sectional view of a knife cutting a membrane in one embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Referring to fig. 1, a film cutting apparatus 1000 according to an embodiment of the present invention is provided, where the film cutting apparatus 1000 includes a knife roll 20, a driving device 30, and a cutter 10 according to an embodiment of the present invention. The cutter 10 is connected with the knife roller 20, and the driving device 30 provides driving force for the rotation of the knife roller 20, so that the knife roller 20 drives the cutter 10 to rotate, and film cutting is performed. The cutter 10 may be embedded in the cutter roll 20 and then connected by a screw, or may be fixed to the cutter roll 20 by a clamp, and the embodiment of the present invention does not limit the connection manner between the cutter 10 and the cutter roll 20. The driving device 30 may be a stepping motor, a dc motor, a servo motor, etc., and the embodiment of the present invention does not limit the specific kind of the driving device 30. By adding the cutter 10 provided by the invention to the film cutting device 1000, the film cutting device 1000 can generate appropriate deformation on the film 40, generate bubbles 60 with appropriate volume, and further facilitate the peeling of the film 40.

In one embodiment, referring to fig. 1 and 4b, the axis 201 of the knife roll 20 is parallel to the film 40 to be processed, and the axis 201 is perpendicular to the edge line 101 of the knife 10. Specifically, the driving device 30 drives the knife roll 20 to rotate around the axis 201, and the cutter 10 rotates around the axis 201 along with the knife roll 20, so that the film 40 is cut. The axis 201 of the knife roll 20 is parallel to the film 40 so that the depth of the cuts 42 is uniform and the volume distribution of the bubbles 60 is relatively uniform in the lengthwise direction. The axis 201 is perpendicular to the edge line 101, reducing the axial force of the knife roll 20 while making the width of the cuts 42 relatively uniform and the volume distribution of the bubbles 60 relatively uniform across the width.

An embodiment of the present invention provides a cutter 10 for cutting a film 40, please refer to fig. 1 to 3a and 5, the object to be processed of the cutter 10 is the film 40 for a release film 50, and the film 40 is attached to the release film 50. In one embodiment, the release film 50 has an adhesive on the side of the film that is attached to the film 40, and the adhesive side of the film is typically used to attach to a device so that the release film 40 is secured to the device. The film 40 is attached to the sticky film surface of the release film 50, so that the release film 50 is not easily damaged, meanwhile, the stickiness of the film surface of the release film 50 can be maintained, and the attaching tightness of the release film 50 and a product is ensured. The film 40 is made of plastic and may be made of polypropylene, polyvinyl chloride, polyethylene terephthalate, or the like.

Specifically, the tool 10 includes a first front 11, a first front 12, and a first end 13, which are interconnected in pairs. The intersection of the first edge 11 and the first edge 12 forms a cutting edge line 101, the first end surface 13 has at least one planar portion 131, and the first end surface 13 may include a curved surface or a flat surface, but the portion of the first end surface 13 intersecting the cutting edge line 101 is a flat surface. The edge line 101 intersects the planar portion 131 of the first end surface 13 at an intersection point S (i.e., the intersection point S is a point on the edge line 101), thereby forming a sharp angle at the intersection point S. Preferably, the first edges 11 and 12 are flat surfaces, the edge lines 101 are straight lines, the sharp angles are relatively sharp, and the deformation generated at the notches 42 is relatively large.

By arranging the structure of the first front surface 11, the first front surface 12 and the first end surface 13 of the cutter 10 and the structure that the first end surface is a plane, so that the intersection point S of the first front surface 11, the first front surface 12 and the first end surface 13 forms a sharp angle, the structure that the first end surface 13 gradually widens from the sharp angle in the first direction 90 from the edge line 101 to the knife roll 20 is formed, and it should be noted that the first direction 90 is perpendicular to the axis 201 of the knife roll 20 and is parallel to the first plane, and the first plane passes through the edge line 101 and is perpendicular to the axis 201 of the knife roll 20. In the film cutting process, the sharp corner firstly enters the film 40, then the first end face 13 enters the film 40 along the first direction 90, and the structure that the first end face 13 gradually widens along the first direction 90 generates larger extrusion force on the film 40 at two sides of the cut 42, so that the film 40 is rapidly cut, larger stress is generated, and larger deformation occurs at the cut 42. The greater deformation allows a greater gap between the film 40 and the release film 50 to create a bubble 60 of sufficient volume to facilitate peeling of the film 40.

Referring to fig. 3a, fig. 3b, fig. 4a and fig. 4b, it can be seen that the technical effects of the present invention are different from the prior art. As can be seen from fig. 3a and 4a, the knife 10 provided by the embodiment of the present invention produces a larger deformation of the cut 42 after cutting on the film 40 than the existing knife. In particular, the deformation produced at the end of the cut 42 close to the visible area 41 is much greater than the deformation produced at the same point with the known tools. As can be seen from fig. 3b and 4b, the volume distribution of the bubbles 60 generated at the cut 42 by the existing cutter is very uneven, and the bubbles 60 on the side of the visible area 41 are too small; in the embodiment of the present invention, the bubbles 60 generated at the cut 42 are uniformly distributed in volume, and the bubbles 60 on the side of the visible region 41 are large enough not to enter the visible region 41. In tearing the film, the film 40 is first opened near the slit 42 so that the film 40 is slowly opened toward the other end of the film 40 along the slit 42. If the above-described slit 42 is too small in volume of the bubble 60 near the center of the film 40 (the viewing area 41), further tearing may not be accomplished.

In one embodiment, referring to fig. 2a and 2b, the edge line 101 has at least one straight line 1011, and the straight line 1011 intersects the planar portion 131 to form an intersection S. It will be appreciated that edge line 101 may include both curved and straight lines, preferably with a portion of the line intersecting planar portion 131 being straight. Through the arrangement, the intersection point S is the intersection point of the straight line and the plane, so that the intersection point S is relatively sharp, and the notch 42 is favorably subjected to relatively large deformation. When the portion of the edge line 101 near the intersection S may also be an arc, i.e., the portion of the edge line that protrudes toward the film 40 when cutting is an arc, the amount of deformation of the cutter 10 in the length direction of the film 40 is relatively uniform. For the film 40 with the larger specific gravity of the area of the visible area 41, the cutter 10 with the edge line 101 being a curve (an arc line protruding toward the film 40) can be used, so that the cut 42 generates relatively small bubbles 60 near the visible area 41 side, and the bubbles 60 are prevented from entering the visible area 41. The knife edge line 101 is of a straight line or curve structure, so that the knife 10 can adapt to the films 40 with different area specific gravities of the visible area 41, and the bubbles 60 meeting the stripping requirements can be generated on the premise that the release films 50 are free of defects in all the films 40.

In one embodiment, referring to fig. 5, the first end surface 13 is in the shape of an isosceles triangle, and the first edge surface 11 and the first edge surface 12 are symmetrical about a plane passing through the edge line 101 and the center line of the isosceles triangle, and are arranged such that the deformation of the notch 42 at one end of the first edge surface 11 and at one end of the first edge surface 12 is almost the same, and the volume of the bubbles 60 generated at both ends is also almost the same.

In one embodiment, referring to fig. 2a and 2b, the first end surface 13 is perpendicular to the first front surface 11 and the first front surface 12. Through the arrangement, when the cutter 10 cuts the film, the deformation amount of the film 40 at the cut 42 is the same at the two sides of the first front surface 11 and the second front surface 12, so that the extension of the bubbles 60 at the cut 42 is effectively limited, and the bubbles 60 at the adjacent cuts 42 are prevented from being connected into a whole and expanding, so that bubble marks are left on the release film 50 or the visible area 41 is left.

In one embodiment, referring to fig. 6, the first angle 18 formed by the first end surface 13 and the edge line 101 is less than or equal to 90 °. By limiting the range of the first angle 18, the situation that when the film cutting starts, the included angle between the first end surface 13 and the surface of the film 40 is too small, the first end surface 13 extends into the film 40 too fast, and the generated stress is increased sharply, so that the two sides of the notch 42 are easy to warp or crack is avoided.

In one embodiment, referring to fig. 5, the first front surface 11 and the first front surface 12 form a second angle 19, and the second angle 19 ranges from 15 ° to 25 °. The first frontal surface 11 is symmetrical to the first frontal surface 12, that is, the included angle between the first frontal surface 11 or the first frontal surface 12 and the symmetrical surface 16 is 7.5-12.5 °. The larger the second angle 19, the larger the area of the first end face 13, the greater the amount of deformation the cutter 10 generates at the cut 42, and the greater the volume of the generated bubble 60. Therefore, when the film 40 is large in area and thick in application, the second angle 19 can be a large value, namely 20-25 degrees, and the generated bubbles 60 are large enough in volume on the premise of ensuring that the bubbles 60 do not enter the visible area 41, so that the thick film 40 can be conveniently peeled off; when the area of the film 40 is small and thin, the second angle 19 can be smaller, 15-20 degrees, on the premise that the size of the bubbles 60 is enough to complete film tearing, the generated bubbles 60 are appropriate in volume, the bubbles 60 of the adjacent cuts 42 are not connected, and the bubbles 60 do not enter the visible area 41. The second angle 19 is preferably set to 20 deg., and the knife 10 is able to have a good film cutting effect on the majority of the film 40. Through the value range of reasonable setting second angle 19, the deformation of restriction membrane 40 in incision 42 width direction is avoided warping too big or undersize for the volume of bubble 60 is in suitable within range, under the prerequisite that does not produce bubble 60 seal and bubble 60 and do not get into visible area 41, can peel off membrane 40 smoothly.

In one embodiment, referring to fig. 1 and 7, the height ranges of the first front surface 11 and the second front surface 12 (hereinafter referred to as the first depth H) along the direction perpendicular to the axis 201 of the knife roll 20 and parallel to the first plane are 80 μm to 180 μm; the first plane is a plane passing through the edge line 101 and perpendicular to the axis 201 of the knife roll 20. Specifically, the first depth H is equal to or greater than the thickness of the film 40 to ensure complete cutting, and the first depth H cannot be too large to cause the release film 50 under the film 40 to be cut. By properly setting the range of the first depth, the cutter 10 can cut into the film sufficiently, which is beneficial to ensure that the film 40 can generate enough deformation at the notch 42.

In one embodiment, referring to fig. 1 and 7, the maximum distance between the first edge 11 and the second edge 12 in the direction perpendicular to the first plane ranges from 3 μm to 7 μm (hereinafter referred to as the first width Dx). Specifically, the first width Dx is preferably 5 μm. By properly setting the range of the first width Dx, the cutter 10 can cut into the film 40 sufficiently, and the film 40 can be deformed at the slit 42 by a sufficient amount.

It should be noted that, whether the first front 11 and/or the first front 12 are flat or arc, the first width Dx satisfies the above range.

In one embodiment, referring to fig. 1 and 2a, the cutting tool 10 further includes a second end surface 15 and a back surface 14, the second end surface 15 is opposite to the first end surface 13, the second end surface 15 is a plane or a curved surface, the back surface 14 is opposite to the edge line 101, and the back surface 14 is a plane or a curved surface. The cutter 10 can be installed on the knife roller 20 through the back 14, so that the back 14 can be set to be a curved surface and connected with the knife roller 20; it may also be provided as a flat surface, with the cutter 10 mounted by grooving the knife roll 20. The second end face 15 can be set to be a plane, on one hand, the processing difficulty is low, and on the other hand, the second end face 15 with a plane structure can also be matched with the back face 14 to be installed in the groove of the knife roller 20; the second end surface 15 may also be curved and may snap into a groove in the knife roll 20. The tool 10 is easily mounted on the knife roll 20 by properly arranging the back surface 14 and the second end surface 15 on the tool 10.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.