JPS62256620A - Method for molding resin product - Google Patents

Abstract

PURPOSE:To transfer recessed and projected patterns of a sheet to the surface of a resin molded product by adhering a section of the emboss patterns of a belt-shaped sheet, injecting molten resin into a cavity between the molds after closing the molds, molding integrally part of the sheet forming emboss patterns and resin and peeling the sheet off the resin. CONSTITUTION:Emboss patterns are formed at a fixed interval on a belt-shaped sheet 32. A cavity of a female mold draws a vacuum through a vent 58 of a female mold 18, and compressed air is sent from a vent 50 of a capping material 44 to peel a sheet 32 off the surface of a heating section 44a and adhere the sheet 32 to the molded face of the female mold 18. The capping material 44 is lifted up from the frame component 46, and a belt-shaped sheet retaining and conveying component 100 is returned to the reference position by the action of an air cylinder 52, being clamped by a press component 56 not to move. The female mold 18 is moved to integrate with a male mold 16 by a ram 22, and molten resin is injected out of an injection machine 28 to prepare a molded product comprising the belt-shaped sheet 32 adhered to the surface of an injection molding section 60. By peeling the belt-shaped sheet 32 off the molded product, a resin product is prepared.

Description

[Detailed description of the invention] (Objective of the invention) (Industrial application field) The present invention forms unevenness Pli at the same time as molding.
1 for the molding method of resin products.

(Prior Art) A method disclosed in Japanese Patent Publication No. 50-19132 is known as a method for simultaneously forming a pattern when injection molding a resin product. This method involves injecting molten resin into the cavity between the molds with a pattern printed in advance between the male molds (4 pieces), and forming a resin product with the sheet integrally attached to the surface. It was designed to do so.

When forming grains or irregularities on the surface of a resin product, etching is applied to the molding surface of the gold to form an uneven pattern, and this uneven pattern is transferred to the resin product during molding.

(Problems to be Solved by the Invention) In the conventional molding method described above, when changing the uneven pattern formed on the H resin crystal, it is necessary to change the mold, and the type of uneven pattern has to be changed. We have many molds available to suit your needs.
Must do.

In addition, conventionally, a single sheet is pressed between molds each time it is molded, which is time-consuming and extremely difficult to align, especially when the molded material is a three-dimensional curved surface.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention forms an uneven pattern at regular intervals on a belt-shaped sheet using thermosetting ink that can withstand the heat and pressure during molding, and After the strip-shaped sheet with the pattern is automatically positioned and the gold is placed in between, the sheet is placed on one of the molds, and then molten resin is injected into the cavity of the mold, and the resin and the sheet are placed in between. - were integrally molded, and then Sea 1 - was peeled off from the resin to transfer the uneven pattern onto the molded product.

(Function) The part of the belt-shaped sheet that has formed the uneven pattern is moved to the position of the 111i mold by moving the moving frame, and while it is softened by the heating plate, it is attached to the molding surface of the female mold. etc., and then after the female mold and female mold are combined, molten Fa resin is applied within 4 days between the molds.
A part of the sheet with the uneven pattern formed thereon is integrally molded with the resin, and then the sheet is peeled off from the resin.11. - By doing so, the uneven pattern of [C]- is transferred to the surface of the resin molded product.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a perspective view of a resin product molded according to the present invention, in which an uneven pattern 10 and uneven characters 12 are formed on the surface 2 of the main body 1 on which the molten Fli resin has solidified.

FIG. 2 is a vertical view of the injection molding apparatus M of the present invention,
At its lower part, a male die 16 is fixed to a fixing 120.
and a female mold 18 which is fixed to the transfer plate 2/I and whose male part is screwed into horizontal direction with respect to the transfer plate 271. 26, which is provided with a protruding bin (not shown) for discharging the molded product out of the mold after injection molding.

An injection device 2 is installed in the center of the fixed platen 20 and the male mold 16.
8 is inserted, and the molten resin injected from this injection device 28 passes through the injection hole 30 bored in the female mold 16 and enters the female mold 16.
'+18 is press-fitted into the cavity.

A strip sheet 32 runs vertically downward between the molds,
Band-shaped sheet 32G, unwinding roll 34 located above
It is held by the scraping roller 36 located below J3, and the traveling position of the lower roller is determined by the idle roller 38.38. Note that the unwinding roll 34 is spring-biased to unwind the strip sheets 1 to 1, and the roll 36 is spring-biased to wind up the strip sheets 1 to 1. , 36L and U, the belt-shaped sheet is pulled in the opposite direction to give tension to it.

Here, the band-shaped sheet 32 is made of a vacuum-formable film such as polyvinyl chloride, polynisal, nylon, polycarbonate, polypropylene, and borisdylene.
Further, a concavo-convex pattern (including grain) is formed on the belt-shaped sheet 32 at regular intervals. This uneven pattern is made of polyurethane,
It is formed by gravure printing or silk printing using thermosetting ink such as epoxy resin. Then, this uneven pattern is set so as to be on the side of the till mold 18 and the mold cavity 8.

In addition to the uneven pattern, positioning marks T (register mark marks) as shown in FIG. 3 are printed on the sheet at regular pitches. The mark T consists of a horizontal line a for defining one core in the vertical i direction (X direction) and a vertical line rAb for determining the position in the left and right direction (Yh direction), and these drawing lines a and b may be formed separately. good.

For both types of the belt-shaped sheet. On the L flow side, the alignment mark formed on the belt-shaped sheet is detected and the regular position is maintained with respect to the uneven pattern of the belt-shaped sheet. A belt-shaped sheet holding and conveying device 100 is installed to move the sheet over the female mold by the pitch, and this device 100
has a frame plate 101, and a movable plate 102 is attached to the frame plate 101 so as to be freely movable downward. Each member 44 in which a heater is embedded is attached to the movable plate 102 by a known moving mechanism so as to be movable in the transverse direction (direction perpendicular to the moving direction of the J plate to be transferred) with respect to the movable &102. A frame member 46 is provided integrally with the lid member 44, and this frame member 46 can freely rotate the support plate 103 installed on the rail 42, but the frame member 46 is designed so that it does not float above the support plate 103. It has become. Cylinders 106 are provided on the left and right sides of both members 44, 46 via arms 104, 105 (
4), by the operation of this cylinder 106, the lid member 44 moves toward the frame member 46 and clamps the sheet. Note that the left and right rails 712 have four The legs 101a hanging from the corners are engaged.The above-mentioned members 44 and 46 quickly cooperate to form the seals 1 to 3.
2 and move the band-shaped sheet 32 between both molds. The frame member 46 has an opening shape and is slidably supported by a rail 42 so that the lower part is open, and the rail 42 is a female!
Two trees are installed vertically on both sides of J'+18.

Each member 44 has a heating part 44a inside thereof, and a plurality of ventilation holes 50 are provided in the heating part 44a.The ventilation holes 50 are connected to a vacuum pump J3 (not shown) through a common guide hole 51. It is connected to a compressed air pump, and switching between these pneumatic sources is performed by a switching valve (not shown). The heating part 44a of the lid member is composed of a heat plate, a sintered metal plate, or a high frequency heating plate. The frame plate 101 is connected to the lower end of the air cylinder 52 and moved in the upward F direction, and the cylinder 52 is rotatably held by a frame (not shown) via a pivot shaft 52a.

Detectors 54 such as phototubes are provided on the tenth floor of the lid member 14 or the frame member 46 to detect the mark T on the strip sheet 32, two for detecting in the X direction and two for detecting in the Y direction. Preferably, two detectors 54 are provided.

Note that a pressing member 56 that supports the band-shaped sheet 32 is installed below the female die 18, and this pressing member 56 is attached to the movable platen 2.
An air cylinder (not shown) supported by D is connected to D. The pressing member 56 extends in the transverse direction of the belt-shaped sheet 32, one of which is fixed, and the other is movable. Furthermore, a vent hole 58 for vacuum extraction is provided in the old model 18.

Next, the operation of this device will be described.

First, the 7i member 44 and the frame member 4G move integrally from the reference position, and the detector 54 detects the horizontal line a of the mark T on the sheet.
When the lid member 4 is detected, the lid member 4 is activated via a known control circuit 2It.
4 and frame member 46 are integrally moved by a moving mechanism including a servo motor (not shown), then both members 44 and 46 are moved in the Y direction by a moving mechanism including a servo motor, and the detector 54 detects the vertical line. Then, the servo motor is stopped via a known control circuit, and the lid member 44 is moved to its normal position relative to the strip.

Next, the vacuum pump is operated to open the ventilation hole 5 of the heating section 44a.
Attach the sheet onto the heating part through the 0. Furthermore, vessel part 4
444 moves toward the frame member 46 side by the operation of the V-cylinder 106, and clamps the sheet 32 between the two members 44 and 46. Note that at this time, the movable plate 102 is moved to the frame plate 101.
Since the rose member 44 is prevented from floating above the moving plate 102, the entire belt-shaped sheet holding and conveying device 100 is moved to the support plate 103 side, and the cylinder 52 is moved from the pivot shaft 52.
Slight inclination g′ around a! IJ.

Thereafter, both members 44 and 46 return to their original reference positions due to the action of the movement R, and as shown in FIG. 5, the cylinder 52 supporting the frame plate 101 extends.
The belt-shaped sheet holding and conveying device iff10C1 integrally descends from the reference position along the rail 42 and stops at a predetermined position on the Iffi'118. Along with this, the sheet is unwound by -pidge. During this time, the sheet is heated and softened by the heating section 44a. Since the lower part of the frame member 46 is open, the frame member 46 can surround the female mold 18, and the lid member 44 holds the sheet and closes the crack of the old mold 18. At this time, the unevenness of the sheet is set at a normal position (tuned position) so that it is aligned with the molding surface of the female mold.

In this state, the -1-↑l bit of the female mold is first evacuated through the vent hole 58 of the jI mold 18. After that, compressed air is sent through the ventilation hole 50 of the lid member/I/l to remove the sheet 32 from the surface of the heating section 44 [1] and tighten the sheet 32 by 1 mL.
2 is attached to the molding surface of the female mold 18 as shown in FIG. In addition, in the case of deep drawing, if the molding surface of the female mold is deep, a part of the base member 44 is held by a cylinder or the like (not shown) while moving toward the molding surface of the female mold, and the vacuum is not applied. - If so, the sheet can be preformed without excessive stretching.

Previous 1. In step C, the cavity of the old mold 18 is evacuated, compressed air is sent from the heating root side, and the air holes 58 are placed on the molding surface of the female mold.
Heating section /I /1 without vacuuming through. a
It is also possible to send compressed air through the ventilation holes 50 and to supply air to the instep through the ventilation holes 58.

However, in this case, it is necessary to provide a large number of ventilation holes 58 in the old model because air remains in the cavity. It is not preferable to provide a large number of ventilation holes 58 because they will leave traces on the molding surface. On the other hand,
According to the method described in the previous section, since the vacuum is drawn in advance, there is no need to provide a large number of ventilation holes in the female mold for forming the sheet. Therefore, it is possible to reduce the number of traces of ventilation holes that occur on the surface of the molded product.

Further, since the belt-like sheet is heated while being adsorbed to the heating portion 44a, there is no possibility that the belt-like sheet will sag during movement of the heating plate and the positional relationship between the uneven pattern and the molded product will shift. In particular, the female type and the old type are separated horizontally and the band-shaped sea 1
In the horizontal type that feeds ~ in the vertical direction,
Although sagging of the belt-shaped sheet due to heating is a problem, with this configuration, there is no worry about sagging.

Thereafter, the six members 44 are lifted up from the frame member 46 by the operation of the cylinder 106, and the belt-shaped sheet holding and conveying member 100 is returned to the reference position shown in FIG. 2 by the operation of the palm ring 52. After this, the pressing member 56 clamps the belt-shaped sheet 32 so that it does not move.

Then, as shown in FIG. 7, the female mold 18 is moved by the ram 22 and combined with the male mold 16, and the molten resin is
It is ejected from 8. Furthermore, the mold is released and the presser member 56
are separated and the strip sheet is released. In this way, a molded product is obtained in which the belt-shaped sheet 32 is (J 41 L/) on the surface of the injection molded part 60.

In addition, IFJI Kino system t111 of 7 shillings 52 etc. to engineering
; L This is carried out using the well-known a, IJ tX1 circuit.

Next, the resin product shown in FIG. 1 is obtained by peeling the band-shaped sheet I-32 from the molded product. By the way, if the 1) resin is made of 8BS, PS, PP, 1) E urethane or acrylic, these resins can be used to form the strip sheet 32.
Therefore, the strip sheet 32 can be peeled off from the molded product very easily, and only the ink that forms the uneven pattern adheres to the surface of the molded product.

In this example, gold W is used horizontally! Although the case where the mold is arranged vertically has been discussed, it goes without saying that it can also be applied to the case where the mold is arranged vertically.

In this case, the lid member 44 and the frame member 46 will move in the horizontal direction.

Also, sleep for vacuuming! The ventilation holes marked in step [J] may be formed as ventilation holes in the peripheral wall of the old model.

〔Effect of the invention〕

As explained above, according to the present invention, there is a
It is possible to form an uneven pattern on the surface of a resin product at the same time as molding, without forming an uneven pattern by tweezing or the like. Therefore, the number of ←F types of molds to be prepared can be reduced, and cost reduction can be achieved.

In addition, since the uneven pattern formed on the band-shaped sheets 1 to 1 can be formed by gravure printing, etc., the uneven pattern has an excellent shape for pre-printing purposes.Furthermore, the band-shaped sheet is also used for molding resin products. Therefore, products can be molded continuously, and furthermore, it is possible to determine the position of the left and right sides of the lower part of the heel, making it possible to mold products with three-dimensional curved surfaces with high precision.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the resin product, Fig. 2 is a side view of a part of the forming mold machine taken in longitudinal section to schematically show the damage, and Fig. 3
The figure shows a scaled plan view of a part of the belt-shaped sheet, Figure 4 shows the state of connection between the lid member and the frame member, 1 a top view, and Figure 5 t shows the completion of Y-preparation of the belt-shaped sheet. Fig. 6 is a partially cross-sectional side view of the water device; Fig. 6 is a vertical sectional view of the female mold and the lid member showing the state inside the female mold after the completion of preforming of the strip sheet;
The figure is a longitudinal sectional view of both TFL1M molds during injection molding. 16... Male type, 18... Female type, 32... Band-shaped sheet, T... Mark, 42... Rail, 44... Lid member, 46... Frame member, 52...・Shilling, 54・
...Detector, 101... Frame handling. Applicant's agent Mr. Sato Figure 3 +05 46 103 105 Figure 4 Figure 6

Claims (1)

[Claims] A large number of uneven patterns are formed on a belt-shaped sheet at regular intervals, and positioning marks are formed for each uneven pattern in the sheet running direction and the width direction of the sheet, and a detector is provided to detect the positioning marks. The positioning mark in the running direction is detected by moving the heating plate in the running direction of the sheet, and the positioning mark in the width direction of the sheet is detected by moving the moving frame that holds the sheet in a direction transverse to the moving platen that holds the moving mold. by moving to
After that, a part of the sheet is held between the heating plate and the frame member, and in this state, the heating plate and the frame member are moved so that part of the sheet faces between the female mold and the male mold, and then the sheet is A part of the resin is heated and softened to adhere to the molding surface of the female mold, and the sandwiched state between the heating plate and the frame member is released, and the molten resin is injected into the cavity formed between the female mold and the male mold. A method for molding a resin product, characterized in that unevenness is transferred to the surface of the molded product by peeling a sheet from the molded product.