JPH0585338B2 - - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial Application Field] The present invention is utilized in the field of synthetic resin molding technology, and in particular relates to a synthetic resin molding method for forming synthetic resin snaps on flexible base materials such as cloth tapes. It is.

[0002]

[Prior Art] Synthetic resin snaps (hooks) used for clothing, such as underwear, are made by attaching a synthetic resin to a flexible base material such as a cloth tape (female hook) and a fastening body (male). (hook) is integrally formed,
This female hook and male hook are combined to form a pair of fasteners.

[0003] When producing this type of synthetic resin molded product using a plastic injection molding machine, conventionally,
As shown in Fig. 3, large holes are punched at a constant pitch in the cloth tape a fed to the molding die, and injection is injected from the injection device into the mold cavity around the large holes through the runner c and the gate d. By injecting synthetic resin, a molded article b is formed integrally with the cloth tape a.

[0004] The flexible tape-like base material has increased flexibility, especially at the periphery of the large hole, so when the synthetic resin is press-fitted into the periphery of the large hole, the mold is broken as shown in FIG. On the side of the gate d communicating with the cavity, that is, on the injection side, the cloth tape a was bent in the press-fitting direction, and at the innermost part of the mold cavity, it was bent in the direction of the circulation of the synthetic resin.

[0005] Furthermore, when the injection pressure of the synthetic resin is high, there is a phenomenon in which the periphery of the large hole in the cloth tape a deforms as shown in FIG. . If the fabric tape a is molded with the large hole periphery deformed in this way, the adhesion force between the fabric tape a and the molded object b will be reduced, so when using the synthetic resin fastener consisting of these male and female hooks, There were problems such as the tape coming off the clothing and creating a space between the periphery of the fastener and the cloth tape.

[0006]

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to prevent the molded part from being removed before molding when integrally injection molding a synthetic resin onto a flexible tape-like base material such as cloth. By impregnating and solidifying the molten synthetic resin to prevent the tape-shaped base material from deforming, the tape-shaped base material is reinforced and molded products such as synthetic resin fasteners can be firmly molded onto the tape base material. The purpose is to

[0007]

[Means for solving the problem] The method of the present invention includes:
A molded article such as a synthetic resin snap is formed firmly and beautifully on a flexible tape-like base material such as cloth, and the molded article forming position of the flexible tape-like base material 21 such as cloth is impregnated with molten synthetic resin. After that, the solidified portion is punched out to form a large hole 5f, and synthetic resin is injected around the large hole 5f to form the molded products 28 and 29 on the flexible tape-like base material 21. It is characterized by being integrally molded.

[0008] The method of the present invention is carried out by following the above-mentioned steps, but since the molded product forming position of a flexible tape-like base material such as cloth is impregnated with molten synthetic resin and solidified, solidification is not possible. The large hole is formed beautifully and accurately by punching out the part, and furthermore, when the synthetic resin is injected around the large hole and the molded product is integrally formed on the flexible tape-like base material. The periphery of the large hole is completely and uniformly embedded in the molded product, and a beautiful molded product is formed around the large hole while being firmly integrated.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. The synthetic molding device 1 is equipped on a plastic injection molding machine A shown in FIG. 1, and specifically, as shown in FIG.
As shown in FIG. 1, there are a base material feeding means 2 arranged on the left and right sides of the molding die 11, a small hole punching means 3, an impregnating means 4, a large hole punching means 5, and a first positioning means arranged in the center. 6, forming means 7, second positioning means 8, ejecting means 9, etc.

[0010] The plastic injection molding machine A is a horizontal injection molding machine (it may be a vertical type if necessary).
It is equipped with an injection device 10 and a molding die 11 arranged on a base (not shown). The injection device 10 uses a screw 10d inserted inside to force-feed synthetic resin material supplied from a hopper 10c disposed at the upper part of a heating cylinder 10b to a molding die 11 side through an injection nozzle 10a.
The molding die 11 is interposed between a fixed plate 13b and a movable plate 12, which are arranged on the left and right sides of the base.

[0011] Between the fixed side plate 13b and the fixed side base plate 13a, there are four tie rods 11c...
A movable plate 12 is connected to the tie rod.
a is slidably attached. The movable side plate 12a is adapted to move toward or away from the fixed side plate 13b by a toggle device 12c connected to a mold clamping cylinder 12b, thereby clamping or opening the molding die 11. .

[0012] The ejection means 9 is an ejector plate 9.
The ejector plate 9a has ejector pins 9b, 9b, and a hydraulic cylinder 9c for reciprocating the ejector plate 9a is connected to the ejector plate 9a. A movable mounting plate 14 is fixed to the right side of the movable plate 12a, while a fixed mounting plate 15 is fixed to the left side of the fixed plate 13b. Further, an ejector plate 9a and a movable template 16 are arranged on the right side of the movable mounting plate 14, and a fixed template 17 is arranged on the left side of the fixed mounting plate 15 via a runner plate 18. . This molding die 11 has a vertical mold parting surface 19 and a tape feeding groove 19a formed between the movable side template 16 and the fixed side template 17, and a cloth tape-like base material 21 is formed. It is now being inserted. A runner 20 is interposed between the stationary mold plate 17 and the runner plate 18 to branch the synthetic resin of the injection device 10.

[0013] The base material feeding means 2 is shown in FIGS. 2 to 4, and includes a reel 2a around which a tape-shaped base material 21 is wound, a guide roller 2b, a tension roller 2c, and a fixed roller 2d. It is equipped with a feed roller 2s, a nip roller 2t, a torque motor 2r, and base material feed fittings 2f and 2g. The nip roller 2t is applied with an appropriate contact pressure and comes into contact with the circumferential surface of the feed roller 2s. The feed roller 2s and the nip roller 2t feed the tape-shaped base material 21 inserted between the two rollers in a tact manner at a constant pitch.

[0014] FIG. 3 shows a plan view of the feed roller 2s section. The feed roller 2s is driven by a torque motor 2r, and is biased by a spring 2u so that the nip roller 2t contacts the feed roller 2s with an appropriate contact pressure. There is.

[0015] Both the base material feed fittings 2f and 2g have the same configuration, and FIG. 4 shows a side view of the base material feeding fitting 2f, but the pad 2i is attached to the rod tip of the small air cylinder 2h, and The material feed fitting 2f is configured to hold the tape-shaped base material 21 at one end thereof. A common feeding rod 2p is fixed to the other ends of the upper and lower base material feeders 2f and 2g. The feed rod 2p is configured to be movable up and down by an air cylinder (not shown), whereby the upper and lower base material feed fittings 2f and 2g are moved up and down synchronously.

[0016] The small hole drilling means 3 is connected to the fixed side template 17.
It is equipped with a punch 3b fixed to a punch planting plate installed inside the punch plate, a stripper 3c having a small hole through which the punch is inserted, and a spring 3d interposed between the stripper and the punch planting plate 3a. are doing. On the other hand, a die 3e is provided on the movable template 16, and a small hole is punched in the tape base material 21 using the punch 3b and the small hole 3f of the die 3e during mold clamping.

[0017] The impregnating means 4 includes an upper mold 4a provided on the stationary mold plate 17 and a lower mold 4b provided on the movable mold plate 16. Upper mold 4a
An impregnating runner 20a is bored in the impregnating runner, and a small diameter gate 4c is bored through the upper mold 4a at the lower end of the impregnating runner. In addition, the lower mold 4b
A partition portion 4d for preventing resin flow is provided in an annular manner and protrudes from the upper surface thereof. This partition portion 4d slightly protrudes inward from the mold parting surface 19, and when the tape-shaped base material 21 is tightened during mold clamping, the molten resin spreads around the tape base material 21. Regulations are in place to ensure that there is no such thing.

[0018] The large hole punching means 5 has almost the same structure as the small hole punching means, and the large hole punching means 5 has a structure similar to that of the small hole punching means.
7, a punch 5b fixed to the punch planting plate, and a stripper 5c having a small hole through which the punch is inserted. A spring 5d is interposed between the plate 5a and the plate 5a. On the other hand, a die 5e is provided on the movable template 16, and a large hole is punched in the tape base material 21 using the punch 5b and the large hole 5f of the die 5e during mold clamping.

[0019] The molding means 7 is a mold for injection molding the object obtained by the apparatus of the present invention, that is, the molded product 28 shown in FIGS. 9 and 10, and is disposed in the final step. A mold 7a provided on the fixed template 17 and a mold 7b provided on the movable template 16.
A molding runner 20b is provided in the mold 7a, and an ejector pin 9 is provided in the mold 7b.
Insertion holes a and 9b are provided.

[0020] The first positioning means 6 is flexible because the tape-shaped base material to be processed is fabric, and accurate positioning is required during processing. , the large hole formed in the tape-like base material 21 is held in the movable mold 6b to properly position the molding position.
It consists of a fixed side mold 6a having a concave portion provided on the fixed side mold plate 17, and a movable side mold 6b provided on the movable side mold plate 16 and having a convex pilot portion 6c, and a large hole punching means 5. A first positioning station is provided between the molding means 7 and the molding means 7.

[0021] The second positioning means 8 is also a means for the same purpose as the first positioning means, and is arranged after the molding means 7, and moves the molded product attached to the tape base material 21 to the movable mold 8b. The tact feeding of the tape-like base material 21 is carried out with exact dimensional accuracy by holding the tactile feed of the tape-like base material 21. and a movable mold 8b having a convex pilot portion 8c.

[0022] As shown in FIG. 2, the small hole punching means 3, the impregnating means 4, the large hole punching means 5, the forming means 7, the first positioning means, and the second positioning means include a small hole punching station S3, an impregnating station S4, A large hole punching station S5, a first positioning station S6, a forming station S7, and a second positioning station S8 are respectively arranged. The distances between the sections of these six stations 3 to S8 are equal, and the tape-shaped base material 21 tact-fed by the base material feeding fittings 2f and 2g is transported from the small hole punching means 3 to the positioning means. 8
They are sent in at a certain pitch one after another.

[0023] The synthetic resin is injected into the impregnation means 4 and the molding means 7 from the injection nozzle 10a through the gates 4c, 7c, runners 20a, 20b, 20, and sprue 24a. Note that 24 is a sprue bush, and 25 and 26 are cylinders for removing the runner 20 from the runner extraction surface when the mold is opened. Further, 27 is a locate ring that presses and fixes the sprue bush.

[0024] As shown in FIG. 2, the tape base material 21 supplied from the reel 2a passes through the guide roller 2b and the tension roller 2c of the tension device, passes through the base material feed fitting 2f, and is transferred to the fixed side template 17. It is guided to the mold parting surface 19 with the movable mold plate 16.

[0025] The tape-shaped base material 21 is passed through the mold parting surface 19 and passed through the base material feeder 2g. The base material feed fittings 2f and 2g are integrally connected by one rod, so that they always move forward and backward at the same time.

[0026] The tape-shaped base material that has passed through the base material feeder is sandwiched between the feed roller 2s and the nip roller 2t, and is tensioned by the torque motor 2r, and is moved by the operation of the base material feeder 2f and 2g. It is fed in tact at a certain pitch. That is,
The stretched tape-like base material 21 is held between the pads 2i of the base material feed fittings 2f and 2g, and both base material feed fittings 2f and 2g are interlocked with the sliding metal fittings that are reciprocated by an air cylinder. As a result, the data is sequentially sent to stations S3, S4, S5, S6, S7, and S8 at a constant pitch.

[0027] FIG. 8 is a diagram showing the work steps at each station S3 to S8. Tape-shaped base material 2
The work for 1 is as follows. First step...Small hole punching means by the small hole punching means 3Second step...Impregnation of the peripheral area of the small hole with synthetic resin by the impregnating means 4Third step...Small hole on the outer periphery of the small hole by the large hole punching means 5 4th step of drilling operation...Positioning of molding work of a molded article such as a fastener by injection of synthetic resin into the mold cavity by the molding means 7...Large hole 21c or molded article by the first and second positioning means 6 or 8 This is done by pushing the pilot member 6c or 8c into 28.

[0028] In these operations, the tape-shaped base material 21 is tact-fed at constant time intervals and at the same pitch in each step, and the above-mentioned steps are performed simultaneously. After the small hole drilling work performed in the first step, the peripheral portion of the small hole 3f is strengthened to the strength of the resin plate in the second step. Therefore, in the third step, the punching work in the large hole punching step is performed with good workability, and the inner periphery of the punched large hole is reinforced, so that it is difficult to fit into the large hole 5f in the next first positioning. The fitting of the mating members is strong and dimensionally accurate. Furthermore, the molding operation in the fourth step can be performed with better workability than conventional operations.

[0029] Below, an example of a molded product in which a snap (fastener) is attached to a tape-shaped base material will be described. Figure 9,
Reference numerals 10, 11, and 12 are a plan view and a sectional view of a molded article molded by this synthetic resin molding apparatus 1, and the molded article is a synthetic resin fastener consisting of a female hook and a male hook.

[0030] As shown in FIG. 9, the female hook 28 has a substantially rectangular shape, and has an opening 28a formed in the center into which a male hook, which will be described later, is fitted. This opening 28a
As shown in FIG. 10, the tapered surface 28 has a rounded edge on the upper surface side 28b and expands toward the lower surface side 28c.
It has d. The male hook 29 also has a substantially rectangular shape as shown in FIG. 11, and has U-shaped locking pieces 29b, 29b on the upper surface side 29a in the center as shown in FIG. The locking piece has an upper end expanded outward and a rounded outer edge, and can be fixed by inserting the locking piece 29a into the opening 28a of the female hook 28 from the upper side 28b. It is said that

【0031】

[Effect] As described above, the present invention impregnates and solidifies the molten synthetic resin at the molding position of a flexible tape-like base material such as cloth, so that large holes can be formed by punching out the solidified portion. The formation is beautiful and accurate, and furthermore, when the synthetic resin is injected around the large hole and the molded product is integrally molded onto the flexible tape-like base material, the hole circumference of the large hole is completely formed. It has the advantage that it is uniformly embedded in the molded product, a beautiful molded product is formed around the large hole, and at the same time, it is firmly integrated.

[Brief explanation of drawings]

[Fig. 1] Center longitudinal sectional front view of a synthetic resin molding apparatus according to the present invention.

[Figure 2] Enlarged view of main parts of Figure 1

[Fig. 3] A plan view of essential parts of the base material feeding means according to the present invention.

[Fig. 4] Side view of the base material feeder according to the present invention

FIG. 5 is a central vertical sectional view of the small hole drilling means according to the present invention.

FIG. 6 is a central vertical sectional view of the impregnating means according to the present invention.

FIG. 7 is a central vertical cross-sectional view of the large hole punching means according to the present invention.

[Fig. 8] Process explanatory diagram of the present invention

FIG. 9 is a plan view of the female member of the snap, which is the molded product of the present invention.

[Figure 10] Cross-sectional view of the female member of the snap, which is the molded product of the present invention

[Fig. 11] Plan view of the male member of the snap, which is the molded product of the present invention.

[Figure 12] Cross-sectional view of a male member of a snap that is a molded product of the present invention

[Figure 13] Cross-sectional view showing the state of a conventional molded product before injection

[Figure 14] Cross-sectional view showing the injection state of a conventional molded product

[Figure 15] Cross-sectional view showing the state of a conventional molded product after injection

[Explanation of symbols]

1...Synthetic resin molding equipment 2...Base material feeding means 2f, 2g...Base material feeder 2i…Pad 2k...Air cylinder 2p...feeding rod 2r...torque motor 6...First positioning means 6c, 8c...Mating member 7... Molding means 8...Second positioning means 10...Injection device 11...Molding mold 12a...Movable side plate 13a...Fixed base 13b...Fixed side plate 14...Movable side mounting plate 15...Fixed side mounting plate 16...Movable side template 17...Fixed side template 19...Mold parting surface 21... Tape-shaped base material 28, 29... Molded product.

Claims (1)

[Claims] 1. A flexible tape-like base material such as cloth is impregnated with a molten synthetic resin at the position where the molded product is to be formed, and then solidified, and then the solidified portion is punched out to form a large hole. A synthetic resin molding method characterized by integrally molding a molded product onto a flexible tape-like base material by injecting a synthetic resin around the holes of the material.