WO2014155587A1

WO2014155587A1 - Mold for injection molding of resin slider bodies and sliders for slide fasteners

Info

Publication number: WO2014155587A1
Application number: PCT/JP2013/059123
Authority: WO
Inventors: 和樹岡田; 映田中; 和也水本
Original assignee: Ykk株式会社
Priority date: 2013-03-27
Filing date: 2013-03-27
Publication date: 2014-10-02
Also published as: TW201446465A; TWI547362B; CN105050446B; CN105050446A

Abstract

This mold for injection molding (1) has a molding cavity (4) defined and formed therein when in a mold closed state and an exhaust channel (7) through which gas enclosed in the molding cavity (4) can be discharged to the exterior of the mold, and molds a resin slider body (20) for use in a slider fastener on the basis of the supply of resin to the molding cavity (4). The molding cavity (4) has a main body molding face (8) for forming the main body (21) of the slider body (20), and a projection-forming recess portion (9) for forming a projection (22) that projects from the exterior surface of the main body (21) of the slider body (20) is recessed from that main body molding face (8). A gas permeable metal portion (10) that forms at least a portion of the bottom (9a) of the projection-forming recess portion (9) and allows the gas inside the molding cavity (4) to flow into the exhaust channel (7), which is located away from the bottom (9a), is provided between the bottom (9a) of the projection-forming recess portion (9) and the exhaust channel (7).

Description

Resin slider body injection mold and slide fastener slider

The present invention has a molding cavity that is partitioned and formed inside in a mold-clamping state, and an exhaust passage that discharges the gas sealed in the molding cavity to the outside of the mold, for supplying a resin material to the molding cavity. The present invention relates to an injection mold for molding a resin slider body for a slide fastener and a slider for a slide fastener, and in particular, a resin in a molding cavity while ensuring the required durability of the mold molding surface. The present invention proposes a technique capable of sufficiently and reliably discharging the gas in the cavity when supplying the material.

In general, when injection molding a small and thin resin molded product such as the resin slider body described above, for example, in a clamped state of a movable mold and a fixed mold, each of the movable mold and the fixed mold is provided. It is necessary to use a molding die in which the interval between the provided molding surfaces is narrowed corresponding to the thickness of the molded product, and in this die, as the molten resin material is supplied to the molding cavity, As a result, the sealed gas to be discharged to the outside of the mold does not easily pass between the molding surfaces of the molding cavity that are close to each other and tends to remain in the cavity, and as a result, the resin material is not sufficiently filled into the cavity. There is a known problem that a molding defect such as a short shot occurs in a resin molded product.

In addition, this means that when a fiber reinforced resin material in which glass fibers or other fibers are mixed with the resin material is used as the above-described resin material, such a fiber reinforced resin material is melted as compared with a single resin material. This is a particularly serious problem because it is inferior in fluidity, and it is difficult to perform degassing smoothly due to inferior fluidity.

On the other hand, in the conventional mold, as described in

Patent Documents

1 and 2, etc., the exhaust gas that exhausts the gas enclosed in the molding cavity in a mold-clamped state to the outside of the mold is described. A ventilation mold member made of sintered metal or the like, which constitutes a passage and a part of a molding surface facing the molding cavity, and allows gas to pass between the molding cavity and the exhaust passage. It is supposed to be provided. According to this mold, when the resin material is supplied, the gas sealed in the molding cavity can sequentially pass through each of the ventilation mold member and the exhaust passage and be discharged to the outside of the mold. it can.

JP 2008-173887 A JP 2004-42459 A

By the way, since the mold molding surface having a profile corresponding to the outer surface shape of the resin molded product of the injection mold gradually wears as it is repeatedly used, this mold molding surface includes wear resistance. A surface treatment with a TiN coating or DLC coating or other high hardness material may be applied to improve durability.

Here, in the above-described molding dies as described in

Patent Documents

1 and 2, the mold member for ventilation that constitutes a part of the molding surface of the mold is greatly exposed to the molding cavity. The exposed surface of the die member for ventilation made of sintered metal that is low in durability and is particularly susceptible to wear, and when the surface treatment of the mold forming surface as described above is performed on this mold The exposed surface of the mold member for ventilation that is greatly exposed to the molding cavity is also coated with TiN or the like, so that the pores of the mold member for ventilation are clogged by the coating, and the gas passes therethrough. It becomes impossible to do so, resulting in poor filling of the resin material into the molding cavity.

An object of the present invention is to solve such problems in the prior art, and the object of the present invention is to wear the exposed surface of the air-permeable portion that forms part of the molding surface. In addition to minimizing other damage caused by use, even if surface treatment is performed on the molding surface of the mold, a sufficient discharge path for the gas enclosed in the molding cavity is secured to the molding cavity. Provided a mold for injection molding of resin slider body, which can effectively prevent deterioration of the quality of molded products due to poor filling of resin material, and slide fastener with excellent quality stability Is to provide a slider.

The injection mold according to the present invention has a molding cavity that is partitioned and formed inside in a clamped state, and an exhaust passage that discharges the gas sealed in the molding cavity to the outside of the mold. An injection mold for molding a resin slider body for a slide fastener based on the supply of the resin material, wherein the slider is formed on the molding surface of the body portion of the molding cavity for forming the body portion of the slider body A protrusion-forming recess for forming a protrusion protruding from the outer surface of the body portion of the body is provided so as to be recessed from the molding surface of the body portion, and is positioned away from the bottom of the protrusion-forming recess. An air-permeable metal part that forms at least a part of the bottom of the projection-forming recess between the exhaust passage and allows the gas in the molding cavity to flow to the exhaust passage. The interposed therebetween is made provided.

In the injection mold according to the present invention, the surface of the molded part of the main body is subjected to a surface treatment, and the surface hardness (Vickers hardness: HV) of the surface-treated part is in the range of 1000 to 10,000. Thus, it is preferable to ensure air permeability at the bottom without substantially subjecting the bottom of the protrusion forming recess. As used herein, “assuring air permeability at the bottom” means that the surface treatment agent does not adhere to the bottom of the protrusion forming recess, and the surface treatment agent adheres to the bottom of the protrusion forming recess. Even in this case, the surface treatment is performed to such an extent that the gas can sufficiently pass through the breathable metal portion at the bottom, and the gas can be discharged from the bottom to the exhaust passage. Further, the “Vickers hardness: HV” is measured in accordance with the Vickers hardness test of JIS Z2244.

Further, in the injection mold according to the present invention, it is preferable that the protrusion forming recess is formed in a groove shape or a hole shape. In this case, the groove width W or diameter W at the opening position to the main body molding surface of the projection-forming concave portion having a groove shape or a round hole shape, and the depth L of the projection-forming concave portion are as follows. , 0.5 <L / W <30 is preferably satisfied, and the groove at the opening position of the projection-forming concave portion having a groove shape or a round hole shape to the molding surface of the main body is formed. The width W or the diameter W is preferably in the range of 0.1 mm to 5.0 mm.

The slider for a slide fastener according to the present invention is configured such that the connecting pillar is disposed between the upper blade and the lower blade of the main body portion formed by connecting the upper blade and the lower blade with a connecting pillar on the front end side. A resin slider body provided with a Y-shaped element guide path extending between and a handle connected to the upper blade plate so as to be rotatable at one end portion; Protrusions projecting from the outer surface are provided on the outer surface, and a width W1 or a diameter W1 of the projecting part at a connection position with the outer surface of the main body part and a projecting height L1 of the projecting part are , 0.5 <L1 / W1 <30.

In the slide fastener slider of the present invention, it is preferable that a gate mark of an injection mold is present on the main body portion, and further, the protrusion portion may be either an upper wing plate or a lower wing plate of the main body portion. Preferably, the gate mark is formed on the other of the upper wing plate and the lower wing plate. More preferably, the protrusion is provided on the upper wing plate of the main body, and the gate mark is formed on the lower wing plate of the main body.

Particularly in this case, the slide fastener slider according to the present invention further includes a handle holding member for holding and holding the handle rotatably at one end thereof on the outer surface of the upper blade, and the protrusion. The tip surface of the part is formed in contact with the breathable metal part of the injection mold, the handle holding member is disposed to cover the tip surface of the protrusion, and the gate mark is It is preferable that it is formed at the rear end side portion of the lower blade. Preferably, the slider body is formed of a resin material containing glass fibers.

In the injection mold according to the present invention, at least a part of the bottom of the projection forming recess is provided between the bottom of the projection forming recess recessed from the molding surface of the main body and the exhaust passage positioned away from the bottom. The surface exposed to the cavity of the low-hardness breathable metal part composed of sintered metal etc. exists in a position recessed from the molding surface of the main body part. Therefore, the amount of wear is reduced even when the mold is used repeatedly. Even if surface treatment is performed on the molding surface of the mold, the exposed surface of the breathable metal portion existing at a position deeper than the molding surface of the main body is formed with pores by a surface treatment agent such as TiN. It will not be coated so much that it clogs.

Therefore, according to the injection mold of the present invention, it is possible to suppress wear and other damage of the exposed surface of the air-permeable portion forming a part of the mold molding surface, and to prevent damage caused by use, and Even when surface treatment is performed on the molding surface of the mold, the quality of the molded product due to poor filling of the resin material into the molding cavity by ensuring a sufficient discharge path for the gas enclosed in the molding cavity Can be effectively prevented.

In the slide fastener slider of the present invention, a protrusion protruding from the outer surface is provided on the outer surface of the main body, and the width W1 or the diameter of the protrusion at a position where the protrusion is connected to the outer surface of the main body. Since W1 and the protrusion height L1 of the protrusion satisfy the relationship of 0.5 <L1 / W1 <30, even when the mold is used repeatedly, the cavity is recessed from the molding surface of the body portion of the cavity. Therefore, even if the metal molding surface is subjected to surface treatment, the ventilation in the projection-forming recess is less likely to occur. Since the conductive metal portion is difficult to be coated with the surface treatment agent, high quality can always be maintained.

It is a fragmentary sectional view in alignment with the sliding direction of the slider trunk | drum which shows one Embodiment of the metal mold | die for injection molding of this invention. It is a cross-sectional perspective view which shows the lower mold | type of the injection mold of FIG. 1 about the principal part. FIG. 3 is a cross-sectional view of the lower mold taken along line III-III in FIG. 1. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1. FIG. 5 is a perspective view showing a slider body that can be molded using the injection mold shown in FIGS. 1 to 4 together with a pull handle and a pull handle holding member attached thereto. FIG. 6 is a perspective view of a slide fastener slider configured by assembling the components shown in FIG. 5. It is sectional drawing which follows the sliding direction of the slider body which shows the slider of FIG.

Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view, in which 1 indicates an injection mold according to one embodiment of the present invention, and 2 in the figure indicates a movable mold constituting the injection mold 1. , And 3 indicates a lower mold as a stationary mold that similarly constitutes the injection mold 1. In addition, although a present Example demonstrates with a vertical molding machine, it is not restricted to this.

Here, the mold 1 for injection molding has a mold cavity 4 corresponding to the shape of the resin slider body to be molded in the clamped state of the upper mold 2 and the lower mold 3 shown in FIG. The cavity 4 is defined by the molding surfaces formed on the opposing surfaces of the upper mold 2 and the lower mold 3, respectively. In addition, although illustration is abbreviate | omitted here, a part of upper mold | type 2 can be made into the slide type | mold which slides in the left-right direction of FIG.

In order to form a resin slider body with such an injection mold 1, a molten resin material from a cylinder of an injection molding machine (not shown) is used as a sprue provided on the upper mold 2 in the mold 1 illustrated in FIG. 1. This is performed by injecting into the molding cavity 4 from the injection gate 6 which is provided in the upper mold 2 and having a narrowed cross-sectional area and filling the molding cavity 4 through cooling and hardening. Can do. As described above, when the resin material is supplied to the cavity 4 in the mold-clamped state, the gas sealed in the cavity 4 is smoothly and reliably discharged, and filling failure due to the remaining sealed gas in the cavity 4 is prevented. In order to prevent this, an exhaust passage 7 for discharging the gas in the cavity 4 to the outside of the mold is not provided on the side of the lower mold 3 of the upper mold 2 and the lower mold 3, for example, on the side of the lower mold 2 provided with the injection gate 6. 1 can be spaced apart from the molding cavity 4 on the lower side of FIG.

Here, on the lower mold 3 side where the exhaust passage 7 is provided, a body portion molding surface 8 for forming a body portion of a resin slider body described later of the molding cavity 4 is shown in a cross-sectional perspective view in FIG. As described above, for example, four protrusion-forming recesses 9 for forming protrusions protruding from the outer surface of the main body are provided, and the bottom 9a of the protrusion-forming recess 9 is spaced downward from the bottom 9a. 1 to 3 between the bottom portion 9a of the projection forming recess 9 and the exhaust passage 7 so as to allow the gas to flow between the exhaust passage 7 and the exhaust passage 7 located above. A breathable metal portion 10 having a quality structure or the like is interposed. The protrusion-forming recess 9 forms a part of the resin material supply path that flows from the injection gate 6 into the molding cavity 4.

According to this, when the resin material is supplied to the molding cavity 4, for example, the resin material flows into the cavity 4 by flowing from the injection gate 6 provided in the upper mold 2 and flows through the cavity 4. The generated air or the gas generated from the molten resin material forms at least a part of the bottom 9a of the projection forming recess 9 after flowing into the projection forming recess 9 from the region of the cavity 4 where the main body portion is formed. Since the gas passes through the air-permeable metal portion 10 and is discharged from the exhaust passage 7 to the outside of the mold, such a sealed gas can be discharged smoothly and the resin material in the cavity 4 is poorly filled. It is possible to effectively prevent short shots and other molding defects mainly caused by the above.

Such a porous breathable metal portion 10 can be formed by, for example, irradiating a metal powder such as maraging steel powder having a particle size of 10 μm to 45 μm with laser to sinter the powder. it can. The breathable metal portion 10 can be formed separately from the surrounding mold portion having a dense structure, while the laser speed, laser output, scanning speed, scanning pitch, stacking pitch, etc. By appropriately controlling, it can be formed integrally with the surrounding dense mold portion. In addition, since the range (laser spot diameter) of laser irradiation is 50 micrometers, it is necessary to contain in it.

The air-permeable metal portion 10 having a porous structure formed as described above has a low hardness and poor durability, so that the surface exposed to the molding cavity 4 is worn by repeated use of the mold 1. However, according to the present invention, the breathable metal portion 10 is disposed below the bottom portion 9a of the projection forming recess 9 so that the breathable metal portion 10 covers at least part of the bottom portion 9a of the projection forming recess 9. Since it was formed, the exposed surface of the breathable metal portion 10 having a low hardness can be reduced, and the amount of wear of the breathable metal portion 10 can be kept small. In addition, although illustration is abbreviate | omitted, an exhaust passage, a breathable metal part, and the recessed part for protrusion formation can also be provided in the upper mold | type side.

By the way, the surface of the mold including the respective molding surfaces of the upper mold 2 and the lower mold 3 may be subjected to surface treatment such as TiN coating, DLC coating, or the like. Since the durability such as wear resistance is increased, it is possible to prevent the occurrence of wear on the molding surface due to the use of the mold 1 and to manufacture a molded product having excellent quality over a long period of time.

Here, when the surface treatment is performed on the mold forming surface, the surface treatment agent such as titanium nitride or silicon carbide is applied to the exposed surface of the breathable metal portion 10 for discharging the gas in the molding cavity 4. When the coating is applied, the pores of the air-permeable metal member 10 are clogged, and the exhaust function there is deteriorated. Therefore, the air-permeable metal portion 10 can be prevented from being covered with the surface treatment agent. Therefore, by performing the surface treatment on the mold molding surface, the surface treatment is performed only on the main body molding surface 8 and, for example, the surface portion adjacent to the main body molding surface 8 of the projection forming recess 9. As a result, even though the durability of the surface region is improved, the gas discharge path in the gas-permeable metal portion 10 is surely secured, so that the filling speed of the resin material into the cavity 4 is increased. Even in this case, it is possible to effectively prevent the deterioration of the quality of the molded product due to poor filling of the resin material.

As an example of such a surface treatment method, PVD, CVD, especially sputtering can be mentioned. When the surface treatment is performed by sputtering or the like, adhesion of the surface treatment agent to the bottom portion 9a of the projection forming recess 9 is suppressed, and a gas discharge path is ensured at the breathable metal portion 10 of the bottom portion 9a. Therefore, it is preferable to perform sputtering in a direction inclined with respect to the main body forming surface 8 as a target from the depth direction of the projection forming concave portion 9 (the direction of the normal line standing on the main body forming surface 8).
When surface treatment is performed on the main body molding surface 8, the surface hardness (Vickers hardness: HV) of the coating portion subjected to the surface treatment is preferably in the range of 1000 to 10,000. In other words, when the Vickers hardness of the coating part: HV is less than 1000, there is a possibility that the wear of the molding surface due to use may not be sufficiently effectively prevented, and the Vickers hardness of the coating part: HV is If it exceeds 10,000, there is a possibility that the hardness difference from the base material becomes large and a problem such as peeling from the base material may occur. More preferably, the coating portion has a Vickers hardness: HV of 1500 to 8000, particularly 2000 to 4000.

Here, the protrusion forming recess 9 described above can be formed in a groove shape extending along a predetermined direction or a hole shape having a cross-sectional shape such as a circle or a polygon, but in the illustrated embodiment, The groove shape extends along the sliding direction of the slider body to be molded (the left-right direction in FIG. 1). More specifically, the length in the direction along the sliding direction of the protrusion forming recess 9 is gradually shortened toward the deeper side in the depth direction, as shown in FIG. As shown in FIGS. 2 and 3, the groove width W of the recess 9 in the direction orthogonal to the sliding direction is substantially constant over the entire length and over the entire depth direction. However, since the protrusion forming recess 9 only needs to be recessed from the main body molding surface 8, the shape thereof may be various shapes other than the groove shape and the hole shape described above.

In the above description, the “sliding direction of the molded slider body” refers to the slider in a state where each of the element rows facing each other is inserted into the Y-shaped element guide path of the molded slider body. It means a direction in which the body slides to engage or separate each element row.

The specific dimensions of the projection forming recess 9 are preferably as shown in FIG. 3 as a cross-sectional view orthogonal to the sliding direction of the slider body. The groove width W at the position is in the range of 0.1 mm to 5.0 mm. When the groove width W of the protrusion forming recess 9 is less than 0.1 mm, the resin material may not flow into the protrusion forming recess 9 because the opening of the protrusion forming recess 9 is too small. . On the other hand, when the groove width W of the projection forming recess 9 exceeds 5.0 mm, the surface treatment agent is applied to the inside of the projection forming recess 9 when the surface treatment is performed on the mold forming surface. There is a possibility that the gas may enter and close the pores of the air-permeable metal member 10 at the bottom 9a, thereby making it impossible to reliably discharge the sealed gas.
More preferably, from the above viewpoint of smoothly flowing the resin material into the projection forming recess 9 and effectively ensuring the air permeability at the bottom 9a of the projection forming recess 9 when performing injection molding, The groove width W is set to 0.5 mm to 3.0 mm.

Further preferably, the groove width W at the opening position of the projection forming recess 9 to the molding surface 8 of the main body and the direction of the projection forming recess 9 perpendicular to the sliding direction (vertical direction in FIG. 3). It is assumed that the measured depth L satisfies the relationship of 0.5 <L / W <30. That is, when L / W ≦ 0.5, the depth L is too shallow with respect to the groove width W of the protrusion forming recess 9, so that when the surface treatment of the molding surface is performed, There is a concern that the treatment agent may cover the breathable metal portion 10 in the projection forming recess 9, and when L / W ≧ 30, the depth L of the projection forming recess 9 is If the groove width W is too small, it may be difficult to fill the resin material in a molten state over the entire protrusion forming recess 9.
For this reason, the groove width W and the depth L of the projection forming recess 9 preferably satisfy the relationship 1 <L / W <20, and more preferably 3 <L / W <10. It is particularly preferable to satisfy

Here, although the illustration of the protrusion forming recess is omitted, when the round hole shape has a circular cross-sectional shape, the diameter of the protrusion forming recess having a round hole shape is used instead of the groove width W described above. It is preferable that W satisfy a relationship of 0.1 mm ≦ W ≦ 5.0 mm and 0.5 <L / W <30.

In the mold 1 of this embodiment, as shown in FIGS. 1 to 3, two of the four protrusion-forming recesses 9 each having a groove shape extending in the sliding direction of the slider body are parallel to each other. The air-permeable metal portion 10 having a substantially rectangular parallelepiped shape is arranged side by side along the sliding direction of the slider body so that the upper surface thereof facing the molding cavity 4 side has all of the protrusion-forming recesses 9. It arrange | positions so that it may adjoin to the bottom part 9a.

Here, in this mold 1, as can be seen from the cross-sectional view taken along the line IV-IV in FIG. 4, the exhaust passage 7 is formed on the lower side of the breathable metal portion 10. The exhaust passage 7 communicates with the pores in the air-permeable metal portion 10 described above through the surrounding portion 7a. The surrounding portion 7a extends around the lower mold portion 3a.

By using the mold 1 as described above, the slider body 20 as shown in FIG. 5 can be formed. The slider body 20 illustrated in FIG. 5 is arranged in parallel with each other at a predetermined interval, and the upper wing plate 21a and the lower wing plate 21b, both of which are substantially flat, are illustrated in FIG. It has the main-body part 21 connected by the connection pillar 21c, and the four protrusion parts 22 provided by protruding from the outer surface (upper surface in the figure) of the upper blade 21a of the main-body part 21, for example. .

Here, the slider body 20 is preferably formed of a resin material containing glass fiber or the like, and specific examples of the fiber reinforced resin material include glass fiber reinforced plastic. According to this, it is possible to obtain the slider body 20 which is lighter than that made of a metal material and which has higher strength than that made of a single resin material. In addition, since the resin material containing glass fiber has low fluidity at the time of melting, it is difficult to discharge the gas generated in the cavity 4, and this is a particular problem. Since the mold 1 described above can easily and reliably discharge such gas, the slider body 20 having excellent quality can be manufactured. On the other hand, as the reinforcing fiber to be included in the resin material used for the slider body 20, an aramid fiber, a carbon fiber, or the like can be used in addition to the glass fiber. In addition, as a resin material, a polyester resin and a polyamide resin can be used.

In the slider body 20, an upper flange 21d and a lower flange 21e extending toward the opposite blade side are provided on each side edge of the upper blade 21a and the lower blade 21b of the main body 21, and The space between the upper wing plate 21a and the lower wing plate 21b is defined by the upper flange 21d, the lower flange 21e, and the connecting column 21c on the front end side. A Y-shaped element guide path 21f through which each of a pair of fixed element rows is inserted is formed with the connecting pillar 21c interposed therebetween.

The slider body 20 can be used as a slide fastener slider 60 shown in FIG. 6 by attaching a handle 30 and a handle holding member 40 as shown in FIG.

The slide fastener slider 60 is connected to the above-described resin slider body 20 and the upper blade 21a side of the slider body 20 to disengage the element rows as shown in FIG. One end of the handle 30 is sandwiched between the upper handle 21a and the handle 30 held by the user when the slider 60 is slid to be displaced on the outer surface of the upper blade 21a. And a handle holding member 40 that rotatably attaches and holds 30 at one end, and in addition, a metal elastic plate member 50 is sandwiched between the upper blade 21a and the handle holding member 40. Arranged and provided with an automatic stop function.

Here, as shown in FIGS. 5 and 6, the puller 30 includes a flat plate portion 31 that is used for holding by the user, arm portions 32 that extend in parallel from the flat plate portion 31, and the arm portions 32. For example, it may be constituted by a rod-like connecting portion 33 having a circular cross section, which are connected to each other at the tips.

Further, here, the handle holding member 40 is formed in a plate shape substantially having a “C” shape in a section along the sliding direction of the slider body 20, and both ends of the plate-like handle holding member 40 in the longitudinal direction are formed. The inward hooking convex portion 41 that engages with each of the outward hooking convex portions 22a provided between the pair of projecting portions 22 of the upper wing plate 21a of the slider body 20 extending in parallel with each other. Each is provided.

In addition, the elastic plate-like member 50 is specifically configured to bend and plastically deform both end portions of a rectangular metal flat plate toward the slider body 20, and the rear end of the slider body 20 out of the both end portions. As shown in a sectional view in FIG. 7, one end portion on the side is an engaging claw portion 51 to the element row that can be inserted into the through hole 23 provided between the projections 22 on the rear end side of the upper blade 21a. Further, the central portion of the above-described metal flat plate is cut out in a rectangular shape leaving one side, and the central portion is raised slightly toward the handle holding member 40 side. It is configured as a spring piece 52 that abuts the lower surface) and urges the engaging claw portion 51 toward the inside of the through hole 23.

According to the slider 60 configured as described above, in a state where a pair of element rows (not shown) are inserted through the element guide path 21f, the elastic plate-like member 50 holds the handle as shown in a sectional view in FIG. The spring piece 52 that is in contact with the inner surface of the member 40 urges the engaging claw 51 toward the lower side in FIG. 7, whereby the engaging claw 51 that enters the through hole 23 of the upper blade 21 a is formed. The slider 60 can be stopped at the position of the element row by engaging between the elements of the element row (not shown).

On the other hand, when the puller 30 is pulled toward the upper side of FIG. 7, for example, the rod-like connecting portion 33 between the elastic plate member 50 and the upper blade 21 a of the puller 30 is connected to the upper blade 21 a. By sliding and displacing on the inclined surface 24 provided on the outer surface, the engaging claw portion 51 of the rod-like connecting portion 33 falling into the element guide path 21f through the through hole 23 is attached to the spring piece 52. Since it acts to pull up against the force, the engaging claw portion 51 can be lifted, and the engaging posture of the engaging claw portion 51 to the element can be removed. Thereby, the stop state of the slider 60 is released, and the slider 60 can be slid along the element row.

In the slider 60 as described above, each protrusion 22 formed by the protrusion forming recess 9 that also functions as a discharge path for the sealed gas during the injection molding described above, as shown in FIG. In a state where the handle holding member 40 is attached to the outer surface of the upper blade 21a, the handle holding member 40 functions to be supported at a certain distance from the outer surface of the upper blade. According to this, the required interval is formed between the handle holding member 40 and the outer surface of the upper wing plate, so that the rod-like connecting portion 33 of the handle 30 on the inclined surface 24 as described above. Sliding displacement is possible, and an automatic stop function of the slider can be realized.

Therefore, in the state shown in FIG. 6, the front end surface of the protrusion 22 provided on the outer surface of the upper wing plate of the slider body 20 is attached with the handle 30, the handle holding member 40 and the elastic plate member 50. Since it is difficult to visually confirm from the outside, by disposing the porous breathable metal portion 10 on the molding surface of the mold 1 at a position corresponding to the tip surface of the projection 22, Even when the exposed surface of the air-permeable metal portion 10 is worn with use, it is possible to suppress a decrease in the design of the product due to such wear.

Here, the dimensions of the projections 22 each having a flat plate shape extending in the sliding direction of the slider body 20 are the same as the dimensions of the projection forming recesses 9 described above in the sliding direction of the slider body 20. The ratio L1 / W1 of the protrusion height L1 to the width W1 in the orthogonal direction is 0.5 <L1 / W1 <30. This protrusion length L1 shall be measured along the normal set up on the outer surface of the upper blade 21a. Although not shown in the drawings, the protruding portion may be formed in a round bar shape protruding on the outer surface of the upper blade. In this case, the width W1 is the diameter W1 of the round bar, and the above numerical range is set. Shall be satisfied.

Here, in this invention, it is preferable that a gate mark (not shown) of the injection mold 1 is present at a position of the main body 21 away from the protrusion 22. More specifically, the protrusion 22 is provided on either the upper wing plate 21a or the lower wing plate 21b of the main body, and the trace of the gate 6 is formed on the other of the upper wing plate 21a or the lower wing plate 21b. Preferably it is formed. In the illustrated embodiment, the protrusion 22 is provided on the upper wing plate 21 a of the main body 21, and the gate 6 trace is formed on the lower wing plate 21 b of the main body 21.
That is, the position of the gate in the injection mold when the slider body 20 is injection-molded is not particularly limited. However, as in the embodiment shown in FIG. The gas in the cavity 4 is exhausted from the bottom 9 a of the protrusion forming recess 9 by the flow of the molten resin material flowing into the molding cavity 4 from the gate 6 positioned away from the protrusion forming recess 9 in the cavity 4. Since it becomes easy to discharge | emit toward a channel | path, the quality of the slider trunk | drum 20 to shape | mold can be maintained highly.

In this case, it is preferable that the protruding portion 22 is disposed on the outer surface of the upper wing plate 21a of the main body portion 21, and the gate mark is formed on the rear end side portion of the lower wing plate 21b. That is, the gate 6 for supplying the resin material to the mold molding surface is a region for forming the lower blade 21b of the main body 21 of the molding cavity 4 (in the upper side in FIG. 1, as in the embodiment shown in FIG. 1). It is preferable to dispose the molten resin material that has flowed into the cavity 4 from the gate 6 into the cavity 4. From the region corresponding to the lower wing plate 21b toward the lower side of FIG. 1, the region corresponding to the connecting post 21c and the region corresponding to the upper wing plate 21a are sequentially passed to reach the protrusion forming recess 9. As a result, the sealed gas in the cavity 4 is more easily discharged into the exhaust passage through the breathable metal portion 10 disposed on the bottom 9a side of the protrusion forming recess 9.

It should be noted that the tip surface of the protrusion 22 formed in contact with the bottom 9a of the protrusion-forming recess 9 during injection molding may have a rougher surface roughness than other portions such as the surface of the main body 21. is there. This is because the exposed surface of the porous air-permeable metal portion 10 forming at least a part of the bottom portion 9 a in the mold 1 is rougher than other molding surfaces including the main body molding surface 8. It is due. The surface roughness of the tip surface of such a protrusion 22 is, for example, relative to the surface roughness (Ra = 0.2 to 1.0 μm) of the outer surface of the main body 21, Ra = 1.0 μm A range of 5.0 μm is preferable. The surface roughness is measured with a laser confocal microscope (Keyence Vk-8500) based on the arithmetic average roughness according to JIS B0601.

By the way, each of the pull handle 30 and the pull handle holding member 40 is manufactured by injection molding using, for example, a thermoplastic resin such as polyamide, polypropylene, polyacetal, or polybutylene terephthalate, or a thermoplastic resin material to which an abrasion resistance reinforcing material is added. can do. However, the puller 30 and the puller holding member 40 can be manufactured by die casting using a metal material such as an aluminum alloy or a zinc alloy instead of using a thermoplastic resin material. The elastic plate-like member 50 can be manufactured by pressing or the like of a metal material such as a copper alloy or stainless steel.

DESCRIPTION OF SYMBOLS 1 Injection mold 2 Upper mold 3 Lower mold 3a Lower mold part 4 Molding cavity 5 Sprue 6 Gate 7 Exhaust passage 7a Surrounding part 8 Main body molding surface 9 Protrusion forming concave part 9a Bottom part 10 Breathable metal part 20 Slider body 21 Main body Part 21a Upper wing plate 21b Lower wing plate

21c Connecting pillar

21d Upper flange

21e Lower flange 21f Element guide path 22 Projection part 22a Outward hooking convex part 23 Through hole 24 Inclined surface 30 Pulling 31 Flat plate part 32 Arm part 33 Rod-like connecting part 40 Pulling holding member 41 Inward hooking convex portion 50 Elastic plate-like member 51 Engaging claw portion 52 Spring piece 60 Slider W Groove width or diameter of the protrusion forming concave portion L Depth of the concave portion for forming the protrusion W1 Width of the protruding portion or Diameter L1 Projection height of protrusion

Claims

In the mold clamping state, it has a molding cavity 4 that is partitioned and formed inside, and an exhaust passage 7 that discharges the gas sealed in the molding cavity 4 to the outside of the mold, for supplying the resin material to the molding cavity 4 An injection mold 1 for molding a resin slider body 20 for a slide fastener,
A protrusion-forming recess for forming a protrusion 22 protruding from the outer surface of the main body 21 of the slider body 20 on the main body forming surface 8 of the forming cavity 4 for forming the main body 21 of the slider body 20. 9 is provided so as to be recessed from the main body molding surface 8;
At least a part of the bottom 9a of the projection-forming recess 9 is formed between the bottom 9a of the projection-forming recess 9 and the exhaust passage 7 positioned away from the bottom 9a, and the molding cavity 4 A mold for injection molding, which is provided with a gas-permeable metal portion 10 that allows the gas inside to flow into the exhaust passage 7.
The main body molding surface 8 is subjected to a surface treatment, and the surface hardness (Vickers hardness: HV) of the surface-treated portion is in the range of 1000 to 10,000, while the bottom of the protrusion forming recess 9 The mold for injection molding according to claim 1, wherein air permeability at 9a is secured.
The injection mold according to claim 1 or 2, wherein the protrusion forming recess 9 is formed in a groove shape or a hole shape.
The groove width W or diameter W of the protrusion-forming recess 9 having a groove shape or a round hole shape at the opening position to the body molding surface 8 and the depth L of the protrusion-forming recess 9 are 0. The injection mold according to any one of claims 1 to 3, wherein the mold satisfies the relationship of 5 <L / W <30.
The groove width W or diameter W of the projection-forming recess 9 having a groove shape or a round hole shape at an opening position to the main body forming surface 8 is in a range of 0.1 mm to 5.0 mm. 5. The injection mold according to any one of 1 to 4.
The main body 21 formed by connecting the upper wing plate 21a and the lower wing plate 21b on the front end side with the connecting column 21c sandwiches the connecting column 21c between the upper wing plate 21a and the lower wing plate 21b. A slide fastener slider 60 comprising a resin slider body 20 provided with an extending Y-shaped element guide path 21f and a handle 30 rotatably connected to the upper blade 21a at one end. There,
A protrusion 22 protruding from the outer surface is provided on the outer surface of the main body 21, and a width W1 or a diameter W1 of the protrusion 22 at a connection position with the outer surface of the main body 21, and the protrusion A slide fastener slider in which the protrusion height L1 of 22 satisfies the relationship of 0.5 <L1 / W1 <30.
The slide fastener slider according to claim 6, wherein the main body portion 21 has a trace of the gate 6 of the injection mold 1.
The protrusion 22 is provided on either the upper wing plate 21a or the lower wing plate 21b of the main body, and the trace of the gate 6 is formed on the other of the upper wing plate 21a or the lower wing plate 21b. Item 8. The slide fastener slider according to Item 7.
The slide fastener slider according to claim 8, wherein the protrusion 22 is provided on the upper blade 21a of the main body 21 and the trace of the gate 6 is formed on the lower blade 21b of the main body 21.
On the outer surface of the upper wing plate 21a, the handle 30 is further provided with a handle holding member 40 that rotatably attaches and holds the handle 30 at one end thereof,
The tip surface of the protrusion 22 is formed in contact with the breathable metal portion 10 of the injection mold 1, and the handle holding member 40 is disposed so as to cover the tip surface of the protrusion 22. The slider for a slide fastener according to claim 9, wherein the trace of the gate 6 is formed on a rear end side portion of the lower wing plate 21b.
The slide fastener slider according to any one of claims 6 to 10, wherein the slider body 20 is formed of a resin material containing glass fiber.