WO2013088561A1

WO2013088561A1 - Fastener element and method for producing same, die, and injection molding device

Info

Publication number: WO2013088561A1
Application number: PCT/JP2011/079090
Authority: WO
Inventors: 浩木原; 雅道長谷川
Original assignee: Ykk株式会社
Priority date: 2011-12-15
Filing date: 2011-12-15
Publication date: 2013-06-20
Also published as: CN103997926A; CN103997926B; TW201340905A; TWI465208B

Abstract

A method for producing a fastener element includes steps for die-matching the following: a first die (50) having a die-matching surface provided with a plurality of cavities (51); a second die (70) having a die-matching surface provided with a plurality of cavities (71); and a core part (60) protruding into the interior of fastener-element molding cavities (85) which are produced as a result of the cavities (51, 71) of the first and the second dies (50, 70) opposing one another. The core part (60) is provided with a plurality of gates (61) for connecting to a common runner (82) and supplying a filling material into the plurality of fastener-element molding cavities (85). The exit ports (61b) of the gates (61) are positioned on the projecting surfaces (67c) of the core part (60) which projects into the fastener-element molding cavities (85).

Description

Fastener element, manufacturing method thereof, mold and injection molding apparatus

The present invention relates to a fastener element, a manufacturing method thereof, a mold, and an injection molding apparatus.

Conventionally, slide fasteners are manufactured by various manufacturing methods. A fastener stringer which is a main component of the slide fastener is manufactured by forming a fastener element row on the side of the tape by an injection molding apparatus.

FIG. 2 of Patent Document 1 shows a state where the movable mold 12 is lowered with respect to the fixed mold 11 and the core 13 is pushed upward. As shown in the figure, the fixed die 11 is used for forming the injection hole 17, the rail groove 18, the concave groove 19 a that accommodates the core 13, the concave groove 20 a that accommodates the fastener tape, the gate groove 21, and the meshing teeth 3. The molding part 22a is provided. When the movable mold 12, the core 13, and the fixed mold 11 are stacked, the resin is supplied to the molding portion 22 a through the injection hole 17, the rail groove 18, and the gate groove 21. FIG. 3 of the same document shows a process of pulling out the molded structure from the core 13. In the gate cutting step after the step shown in FIG. 7, unnecessary portions remaining in the injection hole 17, the rail groove 18, and the gate groove 21 are removed from the fastener stringer body.

Patent Document 2 shows a configuration in which the slit forming portion 17 protrudes into the internal space of the tooth mold 9 as shown in FIGS. This configuration is the same as that of Patent Document 1.

JP-A-3-182202 US Pat. No. 5,529,482

When manufacturing a fastener stringer as disclosed in Patent Document 1, it is required to cut off unnecessary portions filled and solidified in the runner and the gate from the stringer body. In this case, by any cutting means such as a rotary blade, the fastener element portion (the fastener element portion is a portion that becomes a fastener element after cutting) to the gate portion (the gate portion is a portion where the filling material remaining on the gate is solidified). Can be considered as one method. However, in the actual manufacturing process, when the gate portion is cut from the fastener element portion, it may not be cut from the root of the gate portion, and gate marks (for example, gate protrusions) may remain on the surface of the fastener element. obtain. For example, in the case of Patent Document 1, as shown in FIG. 3 of the same document, the fastener tape is pulled in the direction of the arrow P, thereby causing variations in the arrangement of the fastener elements. As a result, the accuracy of cutting the gate portion is reduced. There is a risk of deterioration. Although the above-mentioned gate mark is minute, it cannot be ignored in that it is non-flat compared to the surface of the fastener element. For example, there is a risk of discomfort due to contact or the like to a person (for example, a child, a woman, etc.) wearing clothes with a fastener attached.

As is apparent from the above description, it is desired to suppress the adverse effects caused by the gate marks provided on the fastener element. Note that the above-described problem description is exemplary, and based on this, it is not allowed to limit the interpretation of the present invention.

The method for manufacturing a fastener element according to one aspect of the present invention includes a first mold in which a plurality of cavities are provided on a mold matching surface, and a second mold in which a plurality of cavities are provided on a mold matching surface. And a core part projecting into a fastener element forming cavity formed by facing the cavities of the first and second molds, the core part is connected to a common runner. In addition, a plurality of gates for supplying a filling material to the plurality of fastener element forming cavities are provided, and the outlet of the gate provided in the core portion is exposed in the fastener element forming cavities. A mold matching process provided on the exposed surface of the core portion, and a plurality of the plurality of the gates via the plurality of gates by the mold matching process. In a state where the common runner toner element forming cavities is connected, and a step for supplying a filling material into the fastener elements formed cavity through the runner and the gate.

According to this manufacturing method, in the fastener element portion formed by the fastener element forming cavity, the groove portion is formed corresponding to the convex portion of the core portion, and the gate portion generated by the gate is formed on the surface of the groove portion. Is connected. Thereby, even if a gate trace remains after dividing a gate part from a fastener element part, it can control that a gate trace itself contacts the exterior. Further, even in the case where the gate trace is removed in a further subsequent process, the possibility that the gate trace still remains and becomes a problem can be reduced. In addition, the specific structure of the gate provided in the core part which comprises a part of metal mold | die is arbitrary, If it mentions illustratively, it will be a recessed part, a through hole, etc.

It is preferable that the method further includes a step of dividing a structure formed by solidifying the filling material in at least the fastener element forming cavity and the gate at a boundary between the fastener element forming cavity and the gate.

It is preferable that the method includes a step of separating at least one of the first and second molds and the core portion from each other, and dividing a continuous structure between the fastener element forming cavity and the gate.

And a step of separating the structure formed by the runner and the gate of the structure from the core and separating the structure that has been continuous between the fastener element forming cavity and the gate. .

The exposed surface provided with the outlet of the gate is preferably opposed to the bottom surface of the cavity of the first or second mold.

In the step of supplying the filling material to the fastener element forming cavity through the gate of the core portion, the tape to which the fastener element is to be attached is the mold fitting surface of each of the first and second molds. It is good to carry out in a state where the core string of the tape is arranged in the fastener element forming cavity.

A fastener element manufactured by the method for manufacturing a fastener element according to any one of the above, wherein the fastener element includes a trunk portion, a neck portion that extends from the trunk portion, and is narrower than the trunk portion. A head extending from the neck and wider than the neck, and a pair of shoulders extending from the body and sandwiching the neck. A groove portion extending along the arrangement direction of the pair of shoulder portions is provided on the tip surface of the portion, and a gate mark is provided in the groove portion.

It is preferable that the gate mark provided in the groove portion is provided so as to be shifted to one side with respect to the height direction center of the groove portion in the height direction of the fastener element.

The gate mark is preferably located at the center in the extending direction of the groove.

A fastener element according to an aspect of the present invention includes a body, a neck extending from the body, narrower than the body, extending from the neck, and wider than the neck. A head and a pair of shoulders extending from the body and sandwiching the neck, and the head has a direction along which the shoulders are arranged. An extending groove is provided, and a gate mark is provided in the groove.

It is preferable that the gate mark is partially formed in the groove.

The gate mark is preferably non-flat compared to the inner surface of the groove.

The gate mark may be present inside the groove continuously from a part of the edge of the tip surface of the head.

It is preferable that the gate mark is present apart from the edge of the head end face.

A mold according to an aspect of the present invention includes a first mold in which a plurality of cavities are provided on a mold matching surface, a second mold in which a plurality of cavities are provided on a mold matching surface, A core part projecting into a fastener element forming cavity formed by facing each of the cavities of the first and second molds, the core part being connected to a common runner and having a plurality of A plurality of gates for supplying a filling material to the fastener element forming cavity are provided, and an outlet of the gate provided in the core portion is exposed in the fastener element forming cavity. Provided.

The exposed surface is preferably opposed to the bottom surface of the cavity of the first mold or the second mold.

The gate is preferably a recess formed on the surface of the core portion on the runner side.

The gate is preferably a through-hole formed in the core portion.

An injection molding apparatus according to an aspect of the present invention includes the above-described mold.

According to the present invention, it is possible to suppress adverse effects caused by gate marks formed on the fastener element.

It is a schematic front view of the fastener concerning a 1st embodiment of the present invention. It is the schematic side view and top view of the fastener element which concern on 1st Embodiment of this invention. It is the schematic side view and front view of the fastener element which concern on 1st Embodiment of this invention. It is a schematic partial expansion schematic diagram of the fastener concerning a 1st embodiment of the present invention. FIG. 5 is a schematic end view taken along a two-dot chain line of the fastener of FIG. 4. It is the schematic of the injection molding apparatus which concerns on 1st Embodiment of this invention. It is the schematic model which looked at the lower metal mold | die and core part which concern on 1st Embodiment of this invention from the upper metal mold | die. FIG. 8 is a schematic schematic view showing a cross-sectional configuration of the mold in a closed state according to the first embodiment of the present invention, and shows a schematic cross section taken along X8-X8 in FIG. FIG. 8 is a schematic schematic view showing a cross-sectional configuration of the mold in a closed state according to the first embodiment of the present invention, and shows a schematic cross section taken along X9-X9 in FIG. It is process drawing which shows the state after the type matching which concerns on 1st Embodiment of this invention. It is process drawing which shows the state which filled the metal mold | die which concerns on 1st Embodiment of this invention with the filling material. It is process drawing which shows the state which opened the metal mold | die which concerns on 1st Embodiment of this invention. It is process drawing which shows the state which extruded the unnecessary solidified part from the core part of the metal mold | die which concerns on 1st Embodiment of this invention. It is the schematic model which looked at the fastener element in the state where the gate part which concerns on 1st Embodiment of this invention was connected. It is a schematic diagram which shows the modification of the metal mold | die of 1st Embodiment of this invention. It is the schematic side view and top view of the fastener element which concern on 2nd Embodiment of this invention. It is the schematic model which looked at the lower metal mold | die and core part which concern on 2nd Embodiment of this invention from the upper metal mold | die. FIG. 18 is a schematic schematic view showing a cross-sectional configuration of a mold in a closed state according to a second embodiment of the present invention, and shows a schematic cross section taken along X18-X18 in FIG. FIG. 18 is a schematic diagram showing a cross-sectional configuration of a closed mold according to a second embodiment of the present invention, and shows a schematic cross section taken along X19-X19 in FIG. It is process drawing which shows the state which match | combined the metal mold | die which concerns on 2nd Embodiment of this invention. It is process drawing which shows the state which filled the metal mold | die which concerns on 2nd Embodiment of this invention with the filling material. It is process drawing which shows the state which moved the die unit which concerns on 2nd Embodiment of this invention. It is process drawing which shows the mold open state of the metal mold | die which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the cross-sectional structure of the fastener element of the state which the gate part which concerns on 2nd Embodiment of this invention connected. It is the schematic model seen from the arrow direction along the dotted line of FIG. It is process drawing which shows the state which filled the metal mold | die which concerns on 3rd Embodiment of this invention with the filling material. It is process drawing which shows the state which moved the metal mold unit which concerns on 3rd Embodiment of this invention, and shows only the left half of FIG. It is a schematic diagram which shows the schematic upper surface and cross-sectional structure of the fastener element which concerns on 4th Embodiment of this invention. It is process drawing which shows the state which match | combined the metal mold | die which concerns on 4th Embodiment of this invention. It is process drawing which shows the state which filled the metal mold | die which concerns on 4th Embodiment of this invention with the filling material. It is process drawing which shows the state which moved the die unit which concerns on 4th Embodiment of this invention. It is process drawing which shows the state which match | combined the metal mold | die which concerns on 5th Embodiment of this invention. It is process drawing which shows the state which filled the metal mold | die which concerns on 5th Embodiment of this invention with the filling material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments are not individually independent, and need not be overexplained. Those skilled in the art can appropriately combine the embodiments, and can also grasp the synergistic effect of the combination. In principle, duplicate descriptions between the embodiments are omitted.

The reference drawings are mainly intended for explanation of the invention and are simplified as appropriate. In general, terms that indicate directions (up, down, left, right, etc.) are based on the assumption that the drawing is viewed from the front. The axis AX10 shown in FIG. 1 coincides with the moving direction of the slider, the longitudinal direction of the tape, and the arrangement direction of the fastener elements, but is not limited thereto. When FIG. 1 is viewed from the front, the direction close to the axis AX10 may be referred to as the inside, and the direction away from the axis AX10 may be referred to as the outside.

In the drawings of the present application, xyz coordinates in which the axes are orthogonal to each other may be set. The x-axis corresponds to, for example, the depth (depth direction) of the fastener element, and is also the left-right direction of the slide fastener (the direction horizontal to the fastener tape and perpendicular to the direction in which the slider slides). The y-axis corresponds to, for example, the vertical width / height (vertical width / height direction) of the fastener element, and is also the front / back direction of the slide fastener (direction perpendicular to the plane horizontal to the fastener tape). The z-axis corresponds to, for example, the lateral width (lateral width direction) of the fastener element, and is also the front-rear direction of the slide fastener (the direction horizontal to the fastener tape and the slider slides). The z axis coincides with the axis AX10 shown in FIG. 1 or an arbitrary axis parallel to the axis AX10. Moreover, in the following description, also in description of a metal mold | die, it may explain based on said zyz coordinate of a fastener element. However, the definition of the xyz coordinates described here is an exemplification, and can be appropriately changed from the detailed description and the disclosure of the drawings.

<First Embodiment>
The first embodiment will be described with reference to FIGS. FIG. 1 is a schematic front view of a fastener. FIG. 2 is a schematic side view and top view of the fastener element. FIG. 3 is a schematic side view and front view of the fastener element. FIG. 4 is a schematic partially enlarged schematic view of the fastener. FIG. 5 is a schematic end view taken along the two-dot chain line of the fastener of FIG. 4. FIG. 6 is a schematic view of an injection molding apparatus. FIG. 7 is a schematic diagram of the lower mold and the core as viewed from the upper mold. FIG. 8 is a schematic diagram showing a cross-sectional configuration of the mold in the closed state, and is a schematic cross-section along X8-X8 in FIG. FIG. 9 is a schematic diagram showing a cross-sectional configuration of the mold in a closed state, and is a schematic cross section taken along X9-X9 in FIG. FIG. 10 is a process diagram showing a state after mold matching. FIG. 11 is a process diagram showing a state in which a filling material is filled in a mold. FIG. 12 is a process diagram showing a state where the mold is opened. FIG. 13 is a process diagram showing a state where an unnecessary solidified portion is extruded from a core portion of a mold. FIG. 14 is a schematic schematic view of the fastener element in a state where the gate portion is connected. FIG. 15 is a schematic diagram showing a modification of the mold.

As shown in FIG. 1, a slide fastener (hereinafter sometimes referred to simply as a fastener) 110 has a pair of fastener stringers 101 (left fastener stringer 101a, right fastener stringer 101b) and a slider 10. The fastener 110 is opened and closed by the vertical movement of the slider 10. By sliding and lifting the slider 10 upward, the fastener elements 30 of the pair of

fastener stringers

101a and 101b are engaged. By sliding the slider 10 downward and pulling it down, the engagement of the fastener elements 30 of the pair of

fastener stringers

101a and 101b is released.

As shown in FIG. 1, the fastener stringer 101a includes a long tape 20a extending along the axis AX10 and an inner side of the tape 20a (sides adjacent to each other with the left and right tapes 20a arranged in parallel). A fastener element row having a plurality of fastener elements 30 arranged at regular intervals along the. Further, the configuration of the right fastener stringer 101b can be roughly described by inverting the configuration of the left fastener stringer 101a and shifting it along the axis AX10. In addition,

upper stoppers

30p and 30q provided at the respective upper ends of the left and right fastener element rows, and opening tools provided at the lower ends of the left and right fastener element rows, respectively. And the opening tool is a box bar and box 30n formed at the lower end of the right fastener element row, a butterfly pin 30m formed at the lower end of the left fastener element row and insertable into the box, Is provided. The opening tool may be a bottom stop portion that is not separated into right and left.

In the state shown in FIG. 1, the fastener element 30b is held by meshing between the fastener element 30a and the fastener element 30c. This specific aspect will be specific from the following description, but is well known to those skilled in the art without being overexplained. As shown in FIG. 1, the slider 10 includes a slider body 11, a handle attachment portion 12, a handle 13, and the like. The configuration of the slider 10 is well known to those skilled in the art, and an excessive description is omitted. The tape is a woven or knitted fiber of polyester or the like, and a core string (core part) 22 is woven or knitted on the inner side thereof, and the tape 20 that is a sheet-like member is formed by the core string 22. It is composed of a flat plate portion 21 and a core string (core portion) 22 forming the inner side thereof, and the inner side of the flat portion plate 21 is larger than the flat plate 21. This configuration and manufacturing method are arbitrary.

2 shows a side view of one fastener element 30 fixed to the tape 20 (for convenience, the tape 20 is shown in cross section). The lower part of FIG. 2 shows a schematic diagram of the xz plane including the two-dot chain line of the upper part of FIG. 2 as viewed from the direction of the arrow P3 (here, hatching is applied only to the head of the fastener element). The gate mark 36 on the side surface 35b of the groove 35 is visible from above). The left part of FIG. 3 shows a side view of the fastener element 30 which is equivalent to the upper part of FIG. The right part of FIG. 3 shows a schematic front view of the fastener element 30 viewed from the arrow shown in the left part of the figure. 2 and 3, the direction indicated by the arrow indicating the x axis may be referred to as the front / front side, and the opposite direction may be referred to as the rear / rear side.

2 and 3, the fastener element 30 is injection-molded on the front and back of the tape 20 so that the core string 22 is contained.

As shown in FIGS. 2 and 3, the fastener element 30 is attached to the front and back surfaces of the inner side of the tape 20, and the fastener element 30 is extended from the body portion 32 toward the mating tape 20 and is opposed to the fastener element 30. A head 31 that meshes with the head 30, a body 32, and a neck 33 that is narrower than the head 31 and a pair of shoulders 34 that are arranged so as to sandwich the neck 33. 34a, 34b) and a groove 35 formed at the tip of the head 31 and into which the shoulder 34 of the mating fastener element 30 is fitted. More specifically, the neck portion 33 extends forward from the central region of the lateral width (width in the z-axis direction) of the trunk portion 32, and the head portion 31 extends forward from the entire lateral width of the neck portion 33. It is larger than the width. The shoulder portion 34a extends forward (in the direction from the trunk portion toward the head) from the center region of the height width (width in the y-axis direction) of the trunk portion 32. As shown in the lower part of FIG. 2, a recess is provided between the head 31 and the body 32, thereby forming the narrow neck 33 described above, and closing the slide fastener. Sometimes, the fastener element is engaged by the head of the other fastener element 30 entering. Further, shoulders 34a and 34b are provided in the recess.

As shown in FIGS. 2 and 3, the front end surface of the head 31 (in the depth direction, the end surface opposite to the body portion 32 (front end surface, inner surface)) 31 c is in the lateral width direction (z-axis) of the fastener element 30. A groove 35 (groove may be referred to as a groove portion) 35 is provided that extends along the direction) and is not closed / released at both ends thereof. Due to the groove 35, the tip end portion of the head portion 31 is concave, and

convex portions

31 a and 31 b arranged in parallel to sandwich the groove 35 are provided. The depth of the groove 35 is uniform over the entire region in the extending direction. As shown in the upper part of FIG. 2, the groove 35 is recessed in the depth direction from the front end side of the head, and the surface of the groove is a pair of side surfaces 35 a and 35 b that are horizontal to the tape and face each other. These side surfaces are connected to each other, and the bottom surface 35c is perpendicular to the tape. The side surfaces 35a and 35b are flat surfaces that are substantially parallel to the x axis, and the bottom surface 35c is a flat surface that is substantially perpendicular to the x axis (substantially parallel to the y axis). The vertical width H35 of the groove 35 is wider than the vertical width H34 of the shoulder 34. A line (two-dot chain line) that defines the center in the height direction of the fastener element 30 is located at a position descending from the upper end position of the longitudinal width H30 of the fastener element 30 by a half width H15 of the longitudinal width H30. This line also coincides with the vertical width center of the shoulder portion 34 and also coincides with the vertical width center of the groove 35. In addition, the surface of the groove | channel 35 is good also as a surface where each surface is connected in circular arc shape in the figure which a side surface and a bottom face represent in FIG.

In this embodiment, a gate mark 36 is formed on the side surface 35b of the groove 35. Thereby, for example, it becomes possible to obtain a profit that will be apparent from the following description. The gate mark 36 is more flat than the side surface 35b, and is, for example, a protrusion, a depression, or a rough surface. Here, by way of example, the gate mark 36 is illustrated as a convex portion. The specific mode of the gate mark 36 varies depending on the manufacturing process, and in some cases, the gate mark 36 is flattened by an additional process.

As shown in FIG. 2, the gate mark 36 is located away from an edge 36m (also referred to as an edge, see the lower part of FIG. 2) between the side surface 35b and the tip surface 31c, and the bottom surface is closer to the edge 36m. It is arranged at a position close to 35c. That is, the gate mark 36 is provided so as to be shifted to one side with respect to the height direction center of the groove portion 35 in the height direction of the fastener element. In this case, even if the gate mark 36 has a protruding shape, it is suppressed as much as possible from jumping out of the groove 35 until it exceeds the tip surface 31 c of the head 31. Note that the position of the gate mark 36 in the x-axis direction on the side surface 35b is arbitrary, and should not be limited to the disclosure of FIG. For example, the gate mark 36 may be provided so as to straddle the side surface 35b and the bottom surface 35c. Further, the gate mark 36 may be provided not on the lower side surface 35b in the upper part of FIG. 2 but on the upper side surface 35a in FIG. A gate mark 36 may be provided so as to straddle the side surface 35a and the bottom surface 35c. However, it is preferable that these gate marks 36 are formed at substantially the same position in each fastener element.

As shown in the lower part of FIG. 2, the gate mark 36 is preferably provided at the center of the lateral width of the side surface 35b. Thereby, it can suppress as much as possible that the shoulder part of the other fastener element received by the groove | channel 35 of the fastener element 30 shown in FIG. 2 and the gate trace 36 of the fastener element 30 shown in FIG. 2 contact (FIG. 2). (See also 4).

As shown in the lower part of FIG. 2, the relationship of the lateral width W32a of the trunk portion 32> the maximum lateral width of the head portion 31 (length / width of the groove 35) W31a> the minimum lateral width W33a of the neck portion 33> the maximum lateral width W36a of the gate mark 36. Satisfied. The relationship of the depth width W35 of the groove 35> the depth width W34b of the shoulder 34> the depth width W36b of the gate mark 36 is satisfied. The relationship of the depth width 36b of the gate mark 36 <the x-axis width of the side surface 35b (this width coincides with the width W35) is satisfied. The relationship of the lateral width 36a of the gate mark 36 <the z-axis width of the side surface 35b (this width coincides with the width W31a) is satisfied.

FIG. 4 schematically shows a top view of a state in which the fastener element rows of the fastener stringer 101a and the fastener stringer 101b are engaged with each other. As shown in FIG. 4, the right fastener element 30b is engaged with the left fastener element 30a and the fastener element 30c adjacent to the fastener element 30a. Illustratively, in FIG. 4, the shoulder portion 34a of the left fastener element 30c (the shoulder portion located on the upper side in FIG. 4) is received by the groove 35 of the right fastener element 30b, and the left fastener element 30c. A shoulder portion 34b (lower shoulder portion in FIG. 4) of 30a is received by the groove 35 of the right fastener element 30b. According to the same logic, the upper shoulder 34a of the fastener element 30b (the shoulder located on the upper side in FIG. 4) is received in the groove 35 of the fastener element 30a, and the shoulder 34b (FIG. 4) of the right fastener element 30d. The lower shoulder portion) is received by the groove 35 of the left fastener element 30a.

Assuming that no external force is applied to the fastener 110, as shown in FIG. 4, there is a gap between the gate mark 36 of the fastener element 30a and the shoulder 34b of the fastener element 30d in the z-axis direction. A clearance (interval) of width W91 is provided. Similarly, a clearance having a width W92 is provided in the z-axis direction between the gate mark 36 of the fastener element 30a and the shoulder 34a of the fastener element 30b. That is, a clearance is provided between the gate mark 36 and the shoulder 34 on both sides in the z-axis direction. Thereby, the contact between the protruding gate mark 36 provided on the side surface of the groove 35 and the shoulder portion 34 of the adjacent fastener element 30 can be suppressed.

FIG. 5 schematically shows a schematic cross-sectional configuration of the xz plane including the two-dot chain line of FIG. Assuming that no external force is applied to the fastener 110, as shown in FIG. 5, the side surface 35a of the groove 35 (the side surface located on the upper side in FIG. 5) and the side surface 34m of the shoulder portion 34 (FIG. 5). And a side surface located on the upper side) is provided with a gap having a y-axis width W94. The same applies to the side surface 35b (the side surface located on the lower side in FIG. 5) of the groove 35 and the side surface 34n (the side surface located on the lower side in FIG. 5) of the shoulder portion 34. A space having a y-axis width W93 is provided between the apex of the gate mark 36 provided on the side surface 35b of the groove 35 and the side surface 34n of the shoulder 34 (the side surface positioned on the lower side in FIG. 5). The front end surface 34p of the shoulder portion 34 and the bottom surface 35c of the groove portion 35 are opposed to each other with a predetermined interval. Even if the shoulder portion 34 is biased to one of the upper and lower sides, a sufficient interval is formed by the y-axis widths W93 and W94. Here, the size of the apex of the gate mark 36 protruding from the side surface 35b of the groove 35 is obtained by subtracting the sum of the vertical width H34 of the shoulder portion 34 and the y-axis widths W93 and W94 from the vertical width H35 of the groove 35. Therefore, it is preferable that the projecting dimension of the gate trace does not exceed half of the dimension obtained by subtracting the vertical width H34 of the shoulder 34 from the vertical width H35 of the groove 35.

Hereinafter, a specific example of the above-described method for producing the fastener stringer will be described with reference to FIGS. The fastener stringer is manufactured using, for example, an injection molding apparatus 200 shown in FIG. As shown in FIG. 6, an injection molding apparatus 200 includes a stage 201 to which a lower mold 50 (also referred to as a first mold) is fixed, and a stage to which an upper mold 70 (also referred to as a second mold) is fixed. 202, and is configured so that the interval between the stage 201 and the stage 202 can be adjusted. The injection molding apparatus 200 includes, for example, a computer, and moves and controls the stage with high accuracy in accordance with a feedback signal from a sensing element (for example, an optical sensor, a pressure sensor, etc.). Between the stage 201 and the stage 202, the tape 20 in a state of being stretched in a plane is disposed. Therefore, for example, by moving the stage 202 to the tape 20 side and moving the stage 201 to the tape 20 side in synchronism with this, the tape 20 can be sandwiched between the lower mold and the upper mold. . The injection filling material injected through the hopper 207 is melted by the injection molding unit 206 into the cavities of the upper mold and the lower mold thus laminated, and the fastener element is injected onto the tape 20 by feeding. Molded to produce fastener stringers.

FIG. 7 shows a schematic view of the lower mold 50 viewed from the upper mold 70 side, that is, from above. FIG. 8 shows a schematic cross-sectional view of the entire mold along the two-dot chain line X8-X8 in FIG. FIG. 9 shows a schematic cross-sectional view of the entire mold along the two-dot chain line X9-X9 in FIG. As shown in FIG. 7, on the flat die-matching surface 50z of the lower mold 50, a cavity row 51m corresponding to an element row provided on the fastener stringer 101a and a cavity corresponding to an element row provided on the fastener stringer 101b. A tee row 51n is provided. A space 51r for receiving the core part 60 is provided between the cavity row 51m and the cavity row 51n. The cavity row 51m is a plurality of cavities 51 arranged at regular intervals in the z-axis direction. The cavities adjacent to each other constituting the cavity row 51m are connected by a groove 52 that receives a half of the core string 22 of the tape 20. The lower mold 50 is also formed with a groove for receiving the flat plate portion 21 of the tape 20 (see FIGS. 8 and 9). The cavity is a recess recessed from the mold matching surface, and is defined by a bottom surface and a side surface.

The core part 60 is arranged in the space 51r of the lower mold 50. The core part 60 is a separate body from the lower mold 50. In contrast to the upper mold 70, the core portion 60 may be grasped as a part of the lower mold. The core portion 60 extends in a band shape in the z-axis direction, is accommodated in the space 51r, and is slidable up and down, and at the upper end of the support portion, in the left-right direction of the support portion (in the fastener element forming cavity). The convex part 66 which protrudes in the direction (direction to face) is provided, and the cross-sectional view shape is T shape (refer FIG.8 and FIG.9). As shown in FIG. 7, the core portion 60 is provided with a gate row 61m corresponding to the left cavity row 51m and a gate row 61n corresponding to the right cavity row 51n. Each gate 61 is provided in association with each cavity 51. For example, in FIG. 7, the gate 61p is connected to the cavity 51p on the left side, and the gate 61q is connected to the cavity 51q on the left side. Other gates are similarly connected to the cavity next to the gate. As an example of the pushing means, the core portion 60 is provided with push pins (pushing means) 62 arranged in the through holes of the core portion 60 at a constant interval in the z-axis direction. In the case shown in FIG. 7, when one set of cavities adjacent in the x-axis direction is taken as one set, one push pin 62 is provided corresponding to two sets of cavities. When the upper mold 70 is stacked on the lower mold 50, the upper surface 60a of the strip-shaped core portion 60 extending in the z-axis direction shown in FIG. 7 is a surface that defines the runner.

The upper mold cavity 71 forms a half in the height direction of the head portion 31, the trunk portion 32, the neck portion 33, and the shoulder portion 34 of the fastener element 30 (a half above the center in the front and back direction of the fastener tape 20). It has a part forming part, a trunk part forming part, a neck part forming part, and a shoulder part forming part. The lower mold cavity 51 forms a half in the height direction of the head portion 31, the trunk portion 32, the neck portion 33, and the shoulder portion 34 of the fastener element 30 (a half on the lower side of the center in the front and back direction of the fastener tape 20). It has a head forming part, a trunk forming part, a neck forming part, and a shoulder forming part. The upper and

lower cavities

51 and 71 have a bottom portion that forms the surface of the fastener element 30 and side portions that rise from the four sides of the bottom portion. A groove 52 into which the core string 22 enters is formed. The core portion 60 is located between the upper die and the lower die, and has a convex portion 66 that protrudes into a fastener element forming cavity that is formed by the cavities of the upper die and the lower die facing each other. The convex portion 66 has exposed

surfaces

67a and 67c that form the groove 35 in the head. The exposed surface is a part of the convex portion 66, and when the convex portion 66 is sandwiched between the upper and

lower cavities

51 and 71, the side surface (particularly the head) is formed. It is a part located inside the cavity from the side part of the part to be formed). The upper die and the lower die are matched with the convex portion of the core portion 60 positioned therebetween, and the filling material is supplied, whereby the fastener element portion is injection-molded on the edge portion of the fastener tape. And the groove part 35 is formed in the front end side of the head part of a fastener element by the convex part 66 (the exposed surface).

First, as shown in FIG. 8, the lower mold 50 and the upper mold 70 are aligned with the tape 20 sandwiched in a state where the core portion 60 is arranged in the lower mold 50. For example, as described with reference to FIG. 6, the

stages

201 and 202 are brought close to and in close proximity to the tape 20 to obtain the state of FIG. As shown in FIG. 8, the cavity 51 formed on the mold mating surface of the lower mold 50 and the cavity 71 formed on the mold mating surface of the upper mold 70 face each other. A tee 85 is formed. Here, the case where two fastener stringers are manufactured at the same time is shown. Correspondingly, the fastener element forming cavity located on the left side is a fastener element forming cavity 85a, and the fastener element forming cavity located on the right side is shown. Is shown as a fastener element forming cavity 85b. A filling material, for example, a thermoplastic resin, is supplied to each fastener

element forming cavity

85a, 85b through a common flow path. In addition, the escape of the air at the time of mold matching shall be ensured suitably.

As shown in FIG. 8, the upper mold 70 is provided with a sprue 81 for introducing the thermoplastic resin discharged from the nozzle 204 into the mold 500, and the thermoplastic resin supplied from the sprue 81 is used as a fastener. A runner 82 is provided to guide the element in the arrangement direction (longitudinal direction of the tape 20). The runner 82 is formed continuously in the z-axis direction. When viewed from the fastener element forming cavity 85, the flow path of the thermoplastic resin is constituted by a space in which the sprue 81, the runner 82, and the gate 61 are continuous. As shown in FIG. 9, the runner 82 is partitioned into a trapezoidal shape. Further, the push pin 62 is disposed in a through-hole (push-out pin accommodation hole) of the core portion 60.

In addition, as shown in FIG. 10, the convex part 66 of the core part 60 is arrange | positioned so that it may protrude in the fastener element formation cavity 85 after mold matching. Here, the fastener element forming cavity 85 is a portion that forms the head portion 31, the trunk portion 32, the neck portion 33, and the shoulder portion 34 of the fastener element 30, and the convex portion 66 of the core portion 60 is in the fastener element forming cavity. Thus, the portion that forms the head portion 31 protrudes horizontally with the die-matching surface, thereby forming a groove 35 in the head portion 31 of the fastener element 30 after injection molding. Here, the case where two fastener stringers are manufactured simultaneously is shown, and correspondingly, the convex portion located on the left side is shown as a convex portion 66a, and the convex portion located on the right side is shown as a convex portion 66b. The convex portion 66a has an exposed surface that is exposed (located inside) from the side surface of the cavity in the fastener element forming cavity 85. The exposed surface has an upper surface (side surface) 67a, a tip surface 67b, and a lower surface (side surface) 67c. The upper surface 67a is a part of the upper surface 60a of the core portion 60, and is parallel to the mold matching surface and faces the bottom surface of the cavity of the upper mold. The lower surface 67c is a part of the lower surface 66c of the convex portion 66 of the core portion 60, and is parallel to the mold matching surface and faces the bottom surface of the cavity of the lower mold. The front end surface 67b is a surface that connects the upper surface 67a and the lower surface 67c in the y-axis direction (a direction perpendicular to the die-matching surface), and faces the core string of the tape 20. The gate 61 is a through-hole penetrating the core portion 60, the inflow port 61 a is provided on the upper surface 60 a of the core portion 60 that coincides with the bottom surface of the runner 82, and the discharge port 61 b is a convex portion of the core portion 60. The lower surface 66c of 66 is provided on the lower surface 67c of the exposed surface (see FIG. 8). At the time of injection molding, the molten resin enters the gate 61 from the inlet 61a, exits the gate 61 from the outlet 61b, and the molten resin is supplied into the fastener element forming cavity. The gate 61 extends obliquely downward (outwardly in the direction in which the convex portion 66 of the core portion 60 protrudes and in the direction from the upper die to the lower die). In FIG. 10, the gate 61 extends obliquely outward and downward, but the extending mode of the gate 61 is arbitrary and should not be limited to this. For example, you may make it penetrate from the upper surface 60a of a core part toward the front end surface 67b of an exposed surface. The above description for the left convex portion 66a also applies to the right convex portion 66b.

8 to FIG. 10, after mold matching, a thermoplastic resin is supplied into the mold 500, and as shown in FIG. 11, the space in the mold 500 is filled with the thermoplastic resin. Thereafter, the mold 500 is cooled to solidify the thermoplastic resin. Thereby, in the mold 500, a solidified portion (hereinafter referred to as a sprue portion) 91 corresponding to the sprue 81, a solidified portion (hereinafter referred to as a runner portion) 92 corresponding to the runner 82, and a solidified portion corresponding to the gate 61 are provided. A structure in which a portion (hereinafter referred to as a gate portion) 93 and a solidified portion (hereinafter referred to as a fastener element portion) 94 corresponding to the fastener element forming cavity 85 are arranged is disposed.

Thereafter, as shown in FIG. 12, the mold is opened, for example, the lower mold 50, the upper mold 70, and the tape 20 are separated from each other. Subsequently, as shown in FIG. 13, the push-out pin 62 is pushed upward by an arbitrary means, for example, a feed mechanism utilizing the power of an air cylinder, a hydraulic cylinder, a motor, or the like, or an urging mechanism utilizing a spring force. Accordingly, the bottom surface of the runner portion 92 is pushed upward by the tip surface of the push pin 62, and the runner portion 92 is separated from the core portion 60. In this process, a force that pushes the runner portion 92 upward is applied to the gate portion 93. Then, the gate part 93 is cut off at the connection part / boundary part between the gate part 93 and the fastener element part 94. For example, the diameter of the discharge port of the gate 61 is smaller than the diameter of the introduction port of the gate 61, but this is not necessarily the case. Thus, a fastener element row is provided on the tape by molding, and gate cutting is performed on the die in the same process. Thereafter, the fastener stringer is sent to an optional next step for scraping the gate trace, but this step may be omitted to increase production efficiency. As described above, the gate mark 36 is not on the outer surface of the fastener element 30 but on the surface (here, the side surface) constituting the groove 35 of the head portion 31 thereof. Therefore, the necessity to remove the gate mark 36 is relatively low.

FIG. 14 shows a state in which the gate portion 93 is connected to the fastener element portion 94. When the push pin 62 is pushed up as described with reference to FIG. 13, the gate portion 93 is pulled in the direction indicated by the arrow in FIG. 14 (the direction in which the gate 61 is formed), and the gate portion 93 and the fastener element portion 94 are A “shearing force” is generated at the connection / boundary part. Due to this shearing force, the gate portion 93 is pulled away from the side surface of the groove 35 of the fastener element portion 94. It is assumed that a crack is generated at the root of the gate portion 93, whereby the root portion of the gate portion 93 is divided, and the gate portion 93 is torn from the side surface of the groove 35 of the fastener element portion 94. It should be noted that the present invention should not be limitedly interpreted due to this principle description itself or the influence of its validity (the same applies to the following description).

A modification of this embodiment will be described with reference to FIG. In the above-described embodiment, a set of fastener stringers is manufactured using a common mold at the same time. However, as understood from FIG. 15, only one set of fastener stringers may be manufactured from a single mold. . The present embodiment can be modified in various other ways. For example, the outlet of the gate 61 shown in FIG. 10 may be provided on the upper surface 67a or the tip surface 67b. The gate 61 is not necessarily linear but may be curved. The core part 60 does not need to be T-shaped at all. The number of constituent molds such as an upper mold and a lower mold constituting the mold apparatus is arbitrary. The manufacturing conditions should be adjusted as appropriate depending on the materials used.

<Second Embodiment>
A second embodiment will be described with reference to FIGS. 16 to 25. FIG. 16 is a schematic side view and top view of the fastener element. FIG. 17 is a schematic diagram of the lower mold and the core portion as viewed from the upper mold. FIG. 18 is a schematic diagram showing a cross-sectional configuration of the mold in a closed state, and shows a schematic cross section taken along X18-X18 in FIG. FIG. 19 is a schematic diagram showing a cross-sectional configuration of the mold in a closed state, and shows a schematic cross section taken along X19-X19 in FIG. FIG. 20 is a process diagram showing a state in which the molds are combined. FIG. 21 is a process diagram showing a state in which a filling material is filled in a mold. FIG. 22 is a process diagram showing a state in which the mold unit is moved. FIG. 23 is a process diagram showing the mold opening state of the mold. FIG. 24 is a schematic diagram illustrating a cross-sectional configuration of the fastener element in a state where the gate portion is connected. FIG. 25 is a schematic diagram seen from the arrow direction along the dotted line in FIG.

In this embodiment, unlike the first embodiment, the gate is cut by the movement of the mold unit after resin filling (see FIG. 22). Even in such a case, it is expected to obtain the same effect as that of the first embodiment. Hereinafter, differences from the first embodiment will be described, and the same points as in the first embodiment will be given the same reference numerals as in the first embodiment, and the description thereof will be the same, and the description of the same reference numerals will be omitted. The first embodiment is referred to as necessary. In this embodiment, basically, the same effect as that of the first embodiment can be obtained. The same applies to the following third and fourth embodiments.

As shown in FIG. 16, the fastener element 30 includes a body portion 32 attached to both the front and back surfaces of the inner side of the tape 20, a fastener element 30 that extends from the body portion 32 toward the mating tape 20, and faces the opposite side. A head portion 31 that meshes with each other, a neck portion 33 that is formed between the body portion 32 and the head portion 31 and is narrower than the head portion 31, and a pair of shoulder portions 34 (34a) arranged so as to sandwich the neck portion 33. 34b) and a groove 35 formed at the tip of the head 31 and into which the shoulder 34 of the mating fastener element 30 is fitted. Unlike the first embodiment, the gate mark 36 is provided not on the side surface 35b on the y-axis lower side of the groove portion 35 but on the side surface 35a on the y-axis upper side of the groove portion 35. The gate mark 36 is more flat than the side surface 35b, and is, for example, a protrusion, a depression, or a rough surface. Here, by way of example, the gate mark 36 is illustrated as a convex portion. The specific mode of the gate mark 36 varies depending on the manufacturing process, and in some cases, the gate mark 36 is flattened by an additional process.

As shown in FIG. 16, the gate mark 36 is located at an edge 36m (see the lower part of FIG. 16) between the side surface 35b and the tip surface 31c, and extends from the edge 36m toward the bottom surface 35c of the groove 35. Has been. In this case, even if the gate mark 36 has a protruding shape, the groove 35 protrudes from the side surface 35a of the groove 35 toward the opposite side surface 35b. Jumping out from the front of 35 is suppressed as much as possible.

As shown in FIGS. 17 and 18, after the mold matching, the convex portion 66 of the core portion 60 is disposed so as to protrude into the fastener element forming cavity 85, and the convex portion 66 a is disposed in the fastener element forming cavity 85. In this embodiment, the top surface (side surface) 67a, the tip surface 67b, and the bottom surface (side surface) 67c exposed from the upper mold 70 and the lower mold 50 are the same as those in the first embodiment. Unlike 1st Embodiment, it is not a through-hole but the recessed part of the trapezoid shape (the trapezoid shape which tapers outward from the center of the left-right direction of a core part) by which the upper surface 60a of the core part 60 was cut. As shown in FIGS. 18 and 19, the upper mold 70 is divided into upper molds 70a to 70c. Note that each of the upper mold 70a and the upper mold 70b corresponds to a cavity row, and is a left upper mold 70a and a right upper mold 70b. The upper mold 70c corresponds to the runner 82, and is disposed between the left upper mold 70a and the right upper mold 70b, and serves as a central upper mold 70c. The lower mold 50 also corresponds to the cavity row, and is a left lower mold 50a and a right lower mold 50b, which are arranged on the left and right sides of the core portion 60, respectively. As shown in the enlarged view of the dotted ring in FIG. 20, the gate 61 includes a recess provided on the upper surface 60a of the core portion 60 (this recess is defined by the inclined surface 61d, the bottom surface 61e, and the inclined surface 61f). The

upper molds

70a and 70c above the recesses are partitioned by the lower ends 70a1 and 70c1, and as shown in FIG. 18, an inflow port 61a and a discharge port 61b are formed. Thereby, the inflow port 61a is provided in the upper surface 60a of the core part 60 which corresponds to the bottom surface of the runner 82, and the discharge port 61b is provided in the fastener element forming cavity.

Regarding the manufacturing process, as in the first embodiment, first, the molds are matched to the state shown in FIG. Next, as in the first embodiment, resin is supplied into the mold 500 and the mold is cooled. As a result, as shown in FIG. 21, a structure in which the thermoplastic resin is solidified is molded in the mold 500.

Next, as shown in FIG. 22, the mold units U10 to U30 are separated from each other in a plane (mold matching surface and horizontal plane) while keeping the upper mold and the lower mold aligned. The mold unit U10 (first unit) is a unit in which a left lower mold 50a and a left upper mold 70a are stacked. The mold unit U20 (second unit) is a unit in which the core portion 60 and the center upper mold 70c are stacked. The mold unit U30 (third unit) is a unit in which a lower mold 50b and an upper mold 70b are stacked.

Illustratively, the mold U10 is moved to the left with respect to the fixed mold unit U30, and then the mold U20 is moved to the right with respect to the fixed mold unit U30. By this unit movement, a shearing force is applied to the connecting portion / boundary portion between the gate portion 93 and the fastener element portion 94, and the gate portion 93 is separated from the fastener element portion 94. Next, the mold is opened as shown in FIG. In this way, a fastener element row is provided on the tape by molding, and gate cutting can be performed on the die in the same process. The gate is cut by a simple operation of moving the mold. As a result, the production efficiency of the fastener stringer and, consequently, the fastener is expected to be improved. Further, the fastener stringer is taken out in the mold open state. For example, after the tape 20 is pushed up or divided, each mold unit U10, U20, U30 is temporarily returned to the state at the time of injection molding, and in this state, the upper mold 70 and the lower mold 50 are taken out. Are separated from each other in the vertical direction and the mold is opened, and then the core portion 60 is lifted to be taken out.

24 and 25 show a state in which the gate portion 93 is connected to the fastener element portion 94. When the mold unit is moved as described with reference to FIG. 23, for example, the fastener element portion 94 is pulled in the direction indicated by the dotted arrow in FIG. 24, and “shear” is applied to the connection portion between the fastener element portion 94 and the gate portion 93. Force "is generated. Due to this shearing force, the gate portion 93 is pulled away from the side surface of the groove 35 of the fastener element portion 94. This is because the connection / boundary portion between the gate portion 93 and the fastener element portion 94 is sandwiched between the lower end 70a1 of the left upper mold 70a and the upper surface 66 of the core portion 60 by the movement of the mold unit. It is assumed that a crack is generated at the root of the portion 93, whereby the root portion of the gate portion 93 is divided and the gate portion 93 is torn from the side surface of the groove 35 of the fastener element portion 94.

<Third Embodiment>
A third embodiment will be described with reference to FIGS. 26 and 27. FIG. 26 is a process diagram showing a state in which a filling material is filled in a mold. FIG. 27 is a process diagram showing a state in which the mold unit is moved, and shows only the left half of FIG.

In the present embodiment, the core portion 60 having the gate 61 of the oblique through hole according to the first embodiment is adopted, and the gate cut by the movement of the mold unit (first to third units) according to the second embodiment. Is adopted. Also in this case, the same effects as those of the first and second embodiments can be obtained. As shown in FIG. 26, in a state where the molds are aligned, the mold 500 is filled with resin, and the mold 500 is cooled to solidify the filled resin. Next, as shown in FIG. 27, the mold unit U10 is separated from the mold unit U30. Although not shown, the mold unit U20 is also separated from the mold unit U30. Thereafter, the mold is opened and the fastener stringer is taken out. The shape or the like of the gate mark 36 is expected to be slightly different from that in the first embodiment.

<Fourth embodiment>
The fourth embodiment will be described with reference to FIGS. 28 to 31. FIG. 28 is a schematic diagram illustrating a schematic top surface and a cross-sectional configuration of the fastener element. FIG. 29 is a process diagram showing a state in which the molds are combined. FIG. 30 is a process diagram showing a state in which a filling material is filled in a mold. FIG. 31 is a process diagram showing a state in which the mold unit is moved.

In this embodiment, unlike the above-described embodiment (particularly the second embodiment), a slide fastener 110 having waterproofness is manufactured / provided. Depending on the difference in the fastener type, the configurations of the fastener element 30, the mold, and the like are different. Even in such a case, the same effect as that of the above-described embodiment can be obtained.

As shown in FIG. 28, the fastener element 30 is attached to the tape 20 as in the above-described embodiment. Unlike the above-described embodiment, the inner side 20d of the tape 20 is located on the inner side (the front end side of the head portion 31 of the fastener element) of the fastener element 30 and protrudes inward from the bottom surface 35c of the groove 35. ing. The protruding inner piece 20d brings the left and right inner pieces 20d into close contact with each other when the fastener is closed, and exhibits waterproofness. At the rear end of the body portion 32, a set of leg portions 37 (37a, 37b) divided by dents defining the crotch are provided. As shown in the lower part of FIG. 28, the tape 20 is a sheet member in which a sheet-like core layer 21b is covered with a waterproof layer 21a. The core layer 21b is a tape made of woven or knitted fabric, and the water basin 21a is a synthetic resin or rubber made of a thermoplastic elastomer. This configuration is disclosed in International Publication Pamphlet WO2011 / 077750 (Application No. PCT / JP2009 / 071679), the entire disclosure of which is hereby incorporated by reference.

As shown in FIG. 29, a concave portion for receiving the inner end portion of the tape 20 is provided on the tip surface 67b of the convex portion 66a of the core portion 60. After the molds are aligned as shown in FIG. 29, as in the second embodiment, as shown in FIG. 30, the mold 500 is filled with resin, and the mold 500 is cooled to solidify the filled resin. . Next, as shown in FIG. 31, the mold units U10 and U20 are separated simultaneously or sequentially from the mold unit U30. The shape or the like of the gate mark 36 is considered to be the same as that in the second embodiment.

<Fifth Embodiment>
A fifth embodiment will be described with reference to FIGS. 32 and 33. FIG. 32 is a process diagram showing a state in which the molds are combined. FIG. 33 is a process diagram showing a state in which a filling material is filled in a mold. In the present embodiment, unlike the above-described fourth embodiment, a mold corresponding to that shown in the first embodiment is used. Even in such a case, the same effect as that of the above-described embodiment can be obtained.

After the molds are aligned as shown in FIG. 32, as in the first embodiment, as shown in FIG. 33, the mold 500 is filled with resin, and the mold 500 is cooled to solidify the filled resin. . Next, the extrusion pin is extruded as shown in FIG. 13 of the first embodiment. Alternatively, as shown in the second to fourth embodiments, the mold unit is moved and gate cut is performed.

Based on the above teaching, those skilled in the art can make various modifications to the embodiments. The number of cavities provided in the upper mold and the lower mold is an arbitrary plural number (N), N is a natural number of 2 or more, and the number of cavities is 2 or more. The number of fastener element forming cavities generated by facing the upper and lower mold cavities is equal to the number of gates for individually supplying the filler material to the fastener element forming cavities. Are connected to a common runner, and at the time of injection molding, the filling resin passes through the runner and is supplied from each gate into the fastener element forming cavity, and the fastener element is injection molded.

The type of the fastener element of the slide fastener and the tape type are arbitrary, and may have sealing properties such as waterproofness and airtightness. The filling material may be a filling material other than the thermoplastic resin (for example, energy ray curable resin, metal, etc.). Specific examples of the thermoplastic resin include polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, Teflon (registered trademark), ABS resin, AS resin, acrylic resin, and the like. The method for solidifying the filling material in the mold is arbitrary. The process of mold matching should be understood in a broad sense and should not be understood as meaning only laminating flat plate molds. The specific configuration of the flow path of the filling material leading to the gate is arbitrary. Reference signs included in the claims are for reference only and should not be referenced for the purpose of limiting the scope of the claims. In order to determine whether or not it is a gate mark in the above description, the injection-molded fastener element is visually observed, and other than the inner side surface or the side surface of the groove, the inner side surface or the side surface is not flat. It can be discriminated by the presence or absence (for example, protrusions, depressions, rough surfaces, etc.). In other words, if there is a non-flat part other than the inner surface of the groove or on the side surface, and there is no other non-flat part, a gate is formed on the inner surface or side surface of the groove during injection molding. It is clear that it was. In addition, even when flattened so as to scrape the trace of the gate trace by an additional process, the location with the gate trace is different in surface roughness from the other locations, so such a location Can be identified as the place where the gate mark was formed. From this point, the gate mark includes a case where the gate mark is flattened. In addition to visual observation, the surface roughness may be measured, and the determination may be made by comparing the portion of the gate trace with the other portion.

The convex portion 66 of the core portion 60 is integrally formed with the support portion and the convex portion and has a T-shaped cross section, but is not limited thereto, and may be a separate body. In addition to the cavity for forming the fastener element, the upper mold and the lower mold may be provided with a cavity for molding a separable fitting, an upper stopper, a lower stopper, and the like.

110 ... slide fastener 101 ... fastener stringer

10 ... Slider 20 ... Tape

200 ... Injection molding device

30 ... Fastener element 31 ... Head 32 ... Body 33 ... Neck 34 ... Shoulder 35 ... Groove 36 ... Gate mark 37 ... Leg

500 ... Mold

50 ... Lower mold 51 ... Cavity

60 ... Core 61 ... Gate 61a ... Inlet 61b ... Discharge 62 ... Extrusion pin 66 ... Convex

70 ... Upper mold 71 ... Cavity

81 ... Sprue 82 ... Runner 85 ... Fastener element forming cavity

92 ... Runner part 93 ... Gate part 94 ... Fastener element part

Claims

A first mold (50) in which a plurality of cavities (51) are provided on a mold matching surface; a second mold (70) in which a plurality of cavities (71) are provided on a mold matching surface; The core portion (60) protruding into the fastener element forming cavity (85) formed by the cavities (51, 71) of the first and second molds (50, 70) facing each other is matched. In the process, the core portion (60) is provided with a plurality of gates (61) that connect to a common runner (82) and supply a filling material to the plurality of fastener element forming cavities (85). The exposed surface of the core part (60) in which the outlet (61b) of the gate (61) provided in the core part (60) is exposed in the fastener element forming cavity (85). 67a, it is provided in 67c), and the mold alignment step,
In the state where the common runner (82) is connected to the plurality of fastener element forming cavities (85) through the plurality of gates (61) by the mold matching process, the runner (82) and the gates Supplying a filling material to the fastener element forming cavity (85) via (61);
The manufacturing method of a fastener element containing this.
A step of dividing a structure formed by solidifying the filling material at least in the fastener element forming cavity (85) and the gate (61) at a boundary between the fastener element forming cavity (85) and the gate (61). The fastener element manufacturing method according to claim 1, further comprising:
At least one of the first and second molds (50, 70) and the core part (60) are separated from each other, and are continuous between the fastener element forming cavity (85) and the gate (61). The method for manufacturing a fastener element according to claim 2, further comprising a step of dividing the structured body.
A portion molded by the runner (82) and the gate (61) of the structure is separated from the core (60), and between the fastener element forming cavity (85) and the gate (61). The method for manufacturing a fastener element according to claim 2, further comprising a step of dividing the continuous structure.
The exposed surface (67a, 67c) provided with the outlet (61b) of the gate (61) is the bottom surface of the cavity (51, 71) of the first or second mold (50, 70). The manufacturing method of the fastener element according to any one of claims 1 to 4, wherein
In the step of supplying the filling material to the fastener element forming cavity (85) through the gate (61) of the core portion (60), the tape (20) to which the fastener element is to be attached is It is sandwiched between the mold mating surfaces of the first and second molds (50, 70), and the core string (22) of the tape (20) is disposed in the fastener element forming cavity (85). The method for manufacturing a fastener element according to any one of claims 2 to 5, wherein the fastener element is manufactured as described above.
A fastener element manufactured by the method for manufacturing a fastener element according to any one of claims 1 to 6,
The fastener element (30)
The torso (32);
A neck (33) extending from the body (32) and narrower than the body (32);
A head (31) extending from the neck (33) and wider than the neck (33);
A set of shoulders (34) provided in a manner extending from the body (32) and sandwiching the neck (33),
The tip surface (31c) of the head portion (31) is provided with a groove portion (35) extending along the arrangement direction of the pair of shoulder portions (34), and the groove portion (35) A fastener element provided with a gate mark (36).
The gate mark (36) provided in the groove portion (35) is provided so as to be offset toward one side with respect to the height direction center of the groove portion (35) in the height direction of the fastener element. The fastener element described.
A fastener element (30) according to claim 7 or 8,
The gate mark (36) is a fastener element located at the center in the extending direction of the groove (35).
The torso (32);
A neck (33) extending from the body (32) and narrower than the body (32);
A head (31) extending from the neck (33) and wider than the neck (33);
A set of shoulders (34) provided in a manner extending from the body (32) and sandwiching the neck (33);
The head portion (31) is provided with a groove portion (35) extending along the arrangement direction of the pair of shoulder portions (34). The groove portion (35) includes a gate mark (36). Fastener element is provided.
The fastener element according to claim 10, wherein the gate mark (36) is partially formed in the groove (35).
The fastener element according to claim 10 or 11, wherein the gate mark (36) is located in the center in the extending direction of the groove (35).
The fastener element according to any one of claims 10 to 12, wherein the gate mark (36) is non-flat compared to the inner surface (35a, 35b) of the groove (35).
The said gate mark (36) exists in a groove part (35) inside continuously from a part of edge part of the front end surface (31c) of a head, The one of Claim 10 thru | or 13 characterized by the above-mentioned. The fastener element described.
The fastener element according to any one of claims 10 to 13, wherein the gate mark (36) is spaced apart from an edge of the tip surface (31c) of the head.
A first mold (50) provided with a plurality of cavities (51) on the mold mating surface;
A second mold (70) provided with a plurality of cavities (71) on the mold mating surface;
A core portion (60) projecting into a fastener element forming cavity (85) formed by the cavities (51, 71) of the first and second molds (50, 70) facing each other,
The core portion (60) is provided with a plurality of gates (61) connected to a common runner (82) and supplying a filling material to the plurality of fastener element forming cavities (85),
An outlet (61b) of the gate (61) provided in the core part (60) is an exposed surface (67a, 67c) of the core part (60) exposed in the fastener element forming cavity (85). The mold provided in
The exposed surface (67a, 67c) faces the bottom surface of the cavity (51, 71) of the first mold or the second mold (50, 70). Mold.
The mold according to claim 17, wherein the gate (61) is a recess formed on a surface on the runner side of the core (60).
18. The mold according to claim 17, wherein the gate (61) is a through hole formed in the core portion (60).
An injection molding apparatus comprising the mold according to any one of claims 16 to 19.