JP2009285913A - Injection compression molding mold, adjusting method of the same, and injection compression molding system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an injection compression molding mold, an adjusting method of the same, and an injection compression molding system in order to reduce the height of burrs formed in a gap between blocks having relatively changed positions in the injection compression molding mold for compressing a molding material injected in a cavity formed between a fixed mold and a movable mold. <P>SOLUTION: In the injection compression molding mold 11 which compresses the molding material injected in the cavity 14 formed between the fixed mold 13 and the movable mold 12, a side surface forming block 19 capable of changing the relative position with respect to a core block 16 is provided through the gap 34 in at least cavity 14 side, and adjusted so that openings 29, 30 of the gap 34 may reach low temperatures with respect to the central part 22a of the core block 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to an injection compression mold that compresses a molding material injected into a cavity formed between a fixed mold and a movable mold, an injection compression mold adjustment method, and an injection compression molding system. .

In the injection compression molding, the volume of the cavity formed between the movable mold and the fixed mold can be changed between the start of molding and the end of molding, and the molten resin injected into the cavity can be compressed. This is a molding method. Therefore, in addition to the type in which the cavity is opened by the injection pressure after the mold is closed, there is also a type called an injection press in which the movable mold is stopped with the cavity slightly opened and the movable mold is advanced and pressurized after injecting molten resin. It shall be included in injection compression molding. These injection compression moldings are particularly advantageous for molding thin plate molded products such as light guide plates and disks, because the cavities are slightly opened before the start of injection or after the start of injection, as compared to when the molding is completed. Since the movable mold can be moved in the mold clamping direction after the start of injection and the molten resin can be pressurized, there is no need to perform ultrahigh-speed injection during injection, and a molded product with good transfer and excellent internal stress can be formed.

As an injection compression molding die, one described in Patent Document 1 is known. The type shown in FIG. 8 and the like of Patent Document 1 is a type called a flat die, and the cavity ring 1040 provided in the movable mold is also the same as the reading side mirror 1022 provided in the movable mold. The volume of the cavity can be changed by moving in the mold opening / closing direction. FIG. 9 of Patent Document 1 shows a type called an inlay mold, in which a cavity ring 2040 provided in a fixed mold is fitted to a reading mirror 2022 provided in a movable mold and the mold is opened and closed. The volume of the cavity can be changed by moving in the direction.

However, no lubricant is applied between the cavity ring and the reading mirror (especially on the cavity side) where the position of each type of mold is relatively changed. Then, a slight gap is provided because galling occurs. The gap in the molding die is also used as a gas vent passage for venting gas generated from air or molten resin in the cavity during molding. However, in the case of an injection compression molding die, there is a problem that the molten resin injected into the cavity enters the gap and a burr is formed in the molded product. In order to solve the problem that burrs are formed on the molded product, it is common to process the mold parts so that the width of the gap of the injection compression mold is optimized. However, processing in units of μm (single digit) so that the gap between the injection compression molding dies is optimal requires advanced technology, leading to an increase in mold cost. In addition, the height of the burr formed by the gap between the injection compression molding dies varies depending on a plurality of molding conditions such as the viscosity (temperature) of molten resin, injection speed (pressure), compression speed (pressure), etc. It does not mean that only the processing accuracy needs to be increased.

Therefore, in the prior art such as Patent Document 1, it is inevitable that burrs are formed by the gaps between the blocks of the injection compression molding die, and measures against burrs formed by the shape of the molded product are taken. . In other words, in the example shown in FIG. 5 of Patent Document 1, the height of the outer peripheral portion P of the reading mirror 1022B is made higher than the inner portion thereof, so that the height at which burr can be generated is made lower than the central portion, thereby reducing the influence of burr. ing. In the example shown in FIG. 7 of Patent Document 1, a concave portion is provided in the reading mirror 1022A and the like so that a convex portion higher than the height of the burr is formed to reduce the influence of the burr. However, the countermeasure of Patent Document 1 is not intended to improve the height of the burr itself.

JP 2001-216684 A (0027, 0030, 0032, FIG. 5, FIG. 7, FIG. 8, FIG. 9)

In the present invention, in view of the above problems, the position is relatively changed in an injection compression mold that compresses a molding material injected into a cavity formed between a fixed mold and a movable mold. It is an object of the present invention to provide an injection compression molding die, a method for adjusting an injection compression molding die, and an injection compression molding system, which are intended to reduce the height of burrs formed in gaps between blocks.

An injection compression molding die according to claim 1 of the present invention is an injection compression molding die that compresses a molding material injected into a cavity formed between a fixed die and a movable die. A side surface forming block whose relative position can be changed is provided at least on the cavity side via a gap, and the opening of the gap is at a lower temperature than the center of the core block. It is characterized by being adjusted.

The injection compression mold of the present invention is an injection compression mold that compresses a molding material injected into a cavity formed between a fixed mold and a movable mold, and is relative to the core block. Since the side surface forming block whose position can be changed is provided at least on the cavity side via the gap, and the opening of the gap is adjusted to a low temperature with respect to the central portion of the core block, The height of the burr formed in the gap portion of the side surface forming block can be further reduced or the burr can be substantially eliminated.

An injection compression molding die for a light guide plate of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of an injection compression molding die of this embodiment. FIG. 2 is an enlarged cross-sectional view of a main part of an injection compression molding die at the time of molding. FIG. 3 is a front view of the movable mold of the injection compression mold of the present embodiment. FIG. 4 is a conceptual diagram showing an injection compression molding system including an injection compression molding die and a temperature control device.

FIG. 1 shows a cross section of an injection compression molding die 11 for molding a light guide plate P having a diagonal thickness of 4 inches and a uniform thickness of 0.5 mm according to this embodiment by injection compression molding (line AA in FIG. 3). As shown, the cavity 14 portion is not a cross section of the central portion. The injection compression molding die 11 includes a movable die 12 as a first die and a fixed die 13 as a second die. A cavity 14 having a variable thickness is formed. The movable mold 12 attached to the movable platen of the injection compression molding machine (not shown) is pressurized with molten resin by a mold body 15 having a heat insulating plate 21 attached to the movable platen side and a cavity forming surface 22 to guide the light guide plate P. A core block 16 that forms the main surface of the light guide plate and a side surface forming block 19 that forms the side surface of the light guide plate P by the side surface forming surface 20 are provided.

A core block 16 having a substantially square cavity forming surface 22 substantially matching the shape of the light guide plate P formed on the front surface is fixed to a substantially central portion of the surface of the mold main body 15 on the fixed mold side. A side surface forming block 19 is attached to the surface of the mold main body 15 on the fixed mold 13 side via a spring 18. The side surface forming block 19 is disposed so as to surround the periphery of the core block 16, and can be repositioned relative to the mold body 15 and the core block 16 in the mold opening / closing direction by the spring 18. As shown in FIG. 2, the side surface forming block 19 has a gap formed by a gap surface 25 of the core block 16 and a gap surface 26 of the side surface forming block 19 on the side connected to the cavity 14 with respect to the core block 16. It is arranged via the part 34. In the portion where the gap 34 faces the cavity 14, there are an opening 29 which is a boundary between the gap surface 25 of the core block 16 and the cavity forming surface 22, and the gap surface 26 and the side surface forming surface 20 of the side surface forming block 19. An opening is formed from the opening 30 (including the width direction) as a boundary.

The gap 34 including the opening is a slight gap (for example, a width of 5 to 15 μm) that prevents the core block 16 from being squeezed and ejects compressed air for mold release. A gas passage 34a is formed in the gap surface 25 spaced apart from the cavity 14 side of the core block 16 toward the mold body 15 side, and is connected to an external compressed air supply device (not shown). . Further, on the mold body 15 side of the gas passage 34a of the core block 16, the surfaces of both the blocks 16 and 19 are slidably coated with silicon oil or the like. Both the blocks 16 and 19 may be provided with a gap 34 at least on the cavity 14 side, and the mold main body 15 side has a gap on the whole other than the sliding surface to be lubricated, It may be a guide by a rolling roller.

Further, a surface of the side surface forming block 19 facing the fixed mold 13 is an abutting surface 19a (parting surface), and a part on the gate P1 side is a runner forming surface 32. In the present embodiment, the side surface forming block 19 is divided corresponding to each side of the cavity 14, but may be integrated. Further, the side surface forming block 19 may be pressed against the core block 16 by a spring.

As shown in FIG. 1, the lower part of the core block 16 is connected to the runner forming surface 32 of the side surface forming block 19 through the gate P1. A gate cutter 24 is disposed at the boundary between the core block 16 and the side surface forming block 19 in the gate P1. Further, a projecting pin 23 that is moved forward and backward by an ejector device is disposed inside the side surface forming block 19. And the front-end | tip of the protrusion pin 23 faces the runner formation surface 32, and the biting part 23a is provided in the cross-sectional Z shape so that the runner P2 and the sprue P3 can be easily held. The core block 16 and the runner formation surface 32 may be formed from the same block, and the volume of the runner P2 may be changed.

As shown in FIGS. 1 to 3, cooling medium flow paths 17 a and 17 b are formed inside the core block 16 at a constant distance from the cavity forming surface 22. The cooling medium flow path 17a mainly cools the central portion 22a of the cavity forming surface 22 of the core block 16, and is formed in a substantially rectangular shape (with a cut) as shown by a broken line in FIG. Further, the cooling medium flow path 17b is mainly for cooling the peripheral portion 22b of the cavity forming surface 22 of the core block 16, and as shown by a broken line in FIG. 3, the cooling medium flow path 17b is located at a position outside the cooling medium flow path 17a. It is formed in a substantially rectangular shape (with a cut) in parallel with the cooling medium flow path 17a. Therefore, the cooling medium flow path 17b is formed in parallel with the gap surface 25 of the core block 16 and most of the portion. In the present invention, the central portion 22a and the peripheral portion 22b on the cavity forming surface 22 show a relative positional relationship, and there is no boundary between the central portion 22a and exactly how far. However, it is desirable to make the central portion 22a as wide as possible to make the temperature distribution uniform, and to narrow the peripheral portion 22b so that the temperature curve decreases in the peripheral portion 22b.

The side surface forming block 19 is also formed with a cooling medium flow path 27 in parallel with the gap surface 26. Furthermore, a cooling medium flow path 33 is also formed around the protrusion pin 23 of the side surface forming block 19.

In the present embodiment, as shown in the conceptual diagram of the injection compression molding system in FIG. 4, the coolant flow paths 17a and 17b of the core block 16 are each connected to the temperature control device 28 as one temperature control system. Yes. Further, the cooling medium flow path 27 of the side surface forming block 19 is connected to the temperature control device 28 so that the cooling medium is sent by a system different from the cooling medium flow paths 17a and 17b of the core block 16, and the temperature is controlled separately. It is like that. With the above-described configuration, it is possible to adjust the portions of the openings 29 and 30 to the cavity 14 in the gap portion 34 with respect to the cavity central portion 22a of the core block 16 so as to have a low temperature. In FIG. 4, the cooling medium flow path 33 and the cooling medium flow path 51 of the sprue bush described later are omitted in the figure, but they may be temperature-controlled separately. Moreover, although the temperature control apparatus 28 is shown as one block in FIG. 4, it is not limited to one.

The temperature of the cooling medium sent to the cooling medium flow paths 17a and 17b of the core block 16 may be individually controlled by the temperature control device 28. When the vicinity of the gap 34 is cooled to a relatively low temperature by the cooling medium flow path 17b, it is desirable that the cooling medium flow path 17b is close to the gap surface 25 and provided at a position deeper than the cooling medium flow path 17a. As a result, the temperature does not decrease over a wide range of the peripheral portion 22b of the cavity forming surface 22. Further, when the temperature of the cooling medium channels 17a and 17b is separately controlled as described above, the vicinity of the openings 29 and 30 of the gap 34 is provided in the core even if the cooling medium channel 27 of the side surface forming block 19 is not provided. The temperature can be adjusted to a lower temperature than the central portion 22a of the block 16. In addition to the above, even if the cooling medium channels 17a and 17b are of the same system, the cooling medium channel 17b is closer to the cavity forming surface 22 and the gap surface 25 than the cooling medium channel 17a. The temperature near the openings 29 and 30 of the gap 34 is set to the temperature of the cavity forming surface 22 by forming the cooling medium and sending the cooling medium sent to the cooling medium flow path 17b to the cooling medium flow path 17a as it is. The center portion 22a can be lowered. When the molded product is the light guide plate P, and the brightness and thickness difference of the transfer surface in the peripheral part become a problem, the transfer pattern in the peripheral part of the core block 16 is changed in advance, or the cavity 16 in the peripheral part is changed. It is also possible to take measures such as slightly increasing the thickness on the mold side in advance.

Next, the fixed mold 13 will be described. As shown in FIG. 1, the fixed mold 13 attached to the fixed plate of the injection compression molding machine includes a mold main body 41, a cavity forming block 42 corresponding to a core block, The insert block 43, the sprue bush 44, the gate cutter member 45, the contact block 46, and the like are formed. A heat insulating plate 47 is attached to the fixed plate side of the mold main body 41, and a hole 48 into which a nozzle of an injection device (not shown) is inserted is formed. A locating ring 49 is attached around the hole 48.

A cavity forming block 42 that forms the main surface of the light guide plate P by the cavity forming surface 31 is attached to the mold main body 41 on the movable mold 12 side. A contact block 46 is disposed around the cavity forming block 42 so as to surround the cavity forming block 42. Further, on the cavity 14 side of the cavity forming block 42 and the contact block 46, a slight gap portion 37 (for example, a width of 3 to 3) is difficult for the molten resin to enter due to the gap surface 35 of the cavity forming block 42 and the gap surface 36 of the contact block 46. 10 μm) is formed. The gap surface 37 is a groove that is connected to the gas passage 37a of the cavity forming block 42 and blows out compressed air for mold release. In the present invention, the gap portion 37 is not essential, and the cavity forming block 42 and the contact block 46 may be an integral member, and the gap portion 37 and its opening may be eliminated. The cavity forming surface 31 may be any of a mirror surface, a stamper, etc. in addition to the nickel phosphorus plating transfer surface, and the cavity forming surface 22 is the same. An insert block 43 is disposed in the mold main body 41 together with the cavity forming block 42. The insert block 43 is provided with a sprue bush 44 provided with a hole whose diameter is increased toward the movable platen at the center thereof.

Inside the cavity forming block 42, a cooling medium flow path 38a that mainly cools the central portion 42a and a cooling medium flow path 38b that mainly cools the peripheral portion 42b are formed at a certain distance from the cavity forming surface 31. . The cooling medium flow paths 38 a and 38 b are formed at positions substantially opposite to the cooling medium flow paths 17 a and 17 b of the core block 16 of the movable mold 12. In addition, a cooling medium flow path 39 is also provided in the contact block 46 so as to surround the cavity forming block 42 at a position substantially opposite to the cooling medium flow path 27 of the side surface forming block 19 of the movable mold 12 in the mold opening / closing direction. Is formed. As shown in FIG. 4, the cooling medium flow paths 38a and 38b of the cavity forming block 42 and the cooling medium flow path 39 of the abutment block 46 are connected to the temperature control device 28 as separate systems, respectively. Control is possible. In the present invention, the cooling medium flow path 39 of the contact block 46 is not essential.

Next, the injection compression molding adjustment method of the present invention will be described. In the present embodiment, a relatively high-temperature 120 ° C. cooling medium is circulated from the temperature control device 28 to the cooling medium flow paths 17a, 17b, 38a, and 38b. A 90 ° C. cooling medium is circulated in the cooling medium flow path 27 of the side surface forming block 19 and the cooling medium flow path 39 of the contact block 46. A 90 ° C. cooling medium is also circulated through the cooling medium flow path 33 of the protruding pin 23 and the cooling medium flow path 51 of the sprue bush 44. The temperature control device 28 is controlled in a closed loop. On the cavity forming surface 22 of the injection compression molding die 11, the central portion 22a in which the molten resin as the molding material flows from the gate P1 toward the light incident surface is controlled to a relatively high temperature. In addition, the opening 29 of the gap surface 25 of the core block 16 and the opening 30 of the gap surface 26 of the side surface forming block 19 are cooled from the side surface forming block 19, and thus have a lower temperature than the central portion of the core block 16. ing.

When the mold is closed by a mold clamping device (not shown) and molten resin as a molding material is injected into the cavity 14 formed between the fixed mold 13 and the movable mold 12, the core block 16 of the movable mold 12 is injected. Is slightly retracted by the injection pressure and the cavity 14 is expanded. At this time, since the side surface forming block 19 is held by the spring 18, the position of the side surface forming block 19 is changed relative to the core block 16, and the state in which the side surface forming block 19 is in contact with the contact block 46 is maintained. At the same time, the gas generated from the air and molten resin in the cavity 14 flows out of the mold through the gaps 34 and 37 and the parting surface. When a screw (not shown) advances to a predetermined position by injection, the mold clamping device is operated to perform mold clamping. At that time, the core block 16 is moved forward with respect to the side surface forming block 19, the molten resin in the cavity 14 is compressed, and the internal pressure of the cavity rises.

However, in the present invention, since the peripheral portion 22b of the cavity forming surface 22 of the core block 16 is cooled more than the central portion 22a, a molten resin skin layer is formed earlier on the peripheral portion 22b and enters the gap portion 34. Decrease. Further, even when molten resin enters the gap 34, the temperature of the gap surfaces 25, 26 and the openings 29, 30 is lower than that of the conventional one, so that the molding example using the conventional injection compression mold 91 shown in FIG. As compared with, the molten resin is solidified quickly and the height of the burrs B is lowered. Similarly, the gap 37 on the fixed mold 13 side has a relatively low temperature opening, and the height of the burr B can be reduced.

In the present embodiment, the peripheral portion 22b and the side surface forming block 19 are controlled to have a low temperature with respect to the central portion 22a of the core block 16, but the core block 16 is fixed by a mold clamping device (not shown) during the cooling process. Since the molten resin is compressed through the gate cutter 24 after injection, the gate cutter 24 is moved forward to cut the gate, and even if the holding pressure from the injection device does not reach the cavity 14, the central portion of the light guide plate P may be damaged. It does not occur. This is not limited to a thin molded product such as a light guide plate, and sink marks can be eliminated even in a thick molded product. When the cooling of the molded light guide plate P is completed, compressed air is ejected from the gas passage 37a through the gap 37 into the cavity 14 before the mold is opened, and the release of the light guide plate P is promoted. Then, the compressed air is ejected from the gas passage 34a opened by the mold clamping device to the light guide plate P through the gap 34, the ejection pin 23 is also ejected, and the light guide plate P and the sprue are taken out. .

Next, a method for adjusting the width W of the gap 34 between the core block 16 and the side surface forming block 19 of the injection compression molding die 11 of the present invention will be described with reference to FIGS. The conventional example will be described first. In the conventional injection compression molding mold, the temperature of the side surface forming block is not adjusted. Therefore, the temperature of the core block is directly transmitted to the side surface forming block, and similarly, the side surface forming block is heated. As a result, the width of the gap could not be adjusted.

On the other hand, in the present invention, the width W of the gap 34 can be adjusted by controlling the relative temperature difference between the core block 16 and the side surface forming block 19. As an example, when the temperature of the cooling medium sent to the cooling medium flow path 27 of the side surface forming block 19 is 90 ° C., the temperature of the cooling medium sent to the cooling medium flow paths 17a and 17b of the core block 16 is 110 ° C. to By changing between 130 ° C., the thermal expansion of the core block 16 is changed, and the width W of the gap 34 is adjusted to an optimum dimension. In this embodiment, SUS420J2 which is stainless steel is used for both the core block 16 and the side surface forming block 19, and the thermal expansion coefficient is about 10.3 × 10 ⁻⁶ · C ⁻¹ . Therefore, when the width of the cavity forming surface 22 of the core block 16 is 5.7 mm, when the temperature of the core block 16 is increased by 1 ° C., the width is expanded by about 0.59 μm. Therefore, normally, by controlling the temperature of the core block 16 within a range of 20 ° C., more preferably within a range of 10 ° C., the width W of the gap 34 is optimally adjusted as shown in FIGS. (The optimum width depends on the molding conditions and the like as described above). In addition, with respect to the temperature control of the core block 16, the temperature of the cavity forming block 42 is similarly controlled in order to prevent warping of a molded product such as the light guide plate P. At this time, even if the temperature of the core block 16 is in a high temperature range, the molding cycle time is within an allowable range. Even if the temperature of the core block 16 is in a low temperature range, the transfer and thickness of the molded product such as the light guide plate P are uniform Needless to say, it is molded to be.

Therefore, in the present invention, when the height and size of the burr B formed in the gap portion 34 becomes a problem or galling occurs, the core block 16 is considered in consideration of the material and thermal expansion coefficient of the core block 16. By controlling the temperature, the width W of the gap 34 can be adjusted optimally. In addition to the method of adjusting the temperature of only the core block 16, it is also possible to adjust the width W of the gap portion by keeping the temperature of the core block 16 constant and raising or lowering the temperature of only the side surface forming block 19. Further, the width W of the gap 34 may be adjusted by raising and lowering the temperature of both the blocks 16 and 19 and controlling the relative temperature difference between the both blocks 16 and 19. Further, at the time of adjusting the gap portion 34, the adjustment is initially performed at a low mold closing speed so as not to cause galling.

Next, an injection compression mold according to another embodiment will be described. The injection compression molding mold 71 is a mold called an inlay mold, and the molten resin injected into the cavity 74 formed between the fixed mold 72 and the movable mold 73 can be compressed. ing. The fixed mold 72 includes a mold main body 75, a cavity forming block 76, a side surface forming block 77, and the like, and includes a hot runner 78. On the other hand, the movable mold 73 has a core block 80 fixed to the front surface of the mold main body 79 and includes a protruding pin 81 and the like. When the mold is closed, the core block 80 of the movable mold 73 is fitted into the frame-shaped side surface forming block 77 provided in the fixed mold 72 to form the cavity 74. At this time, a gap portion is formed between the gap surface 82 inside the side surface forming block 77 and the gap surface 83 of the core block 80 so that the molten resin does not easily enter without causing galling.

In another embodiment, the cooling medium flow path 84 is formed inside the cavity forming block 76 of the fixed mold 72, and the cooling medium flow path 85 is formed inside the side surface forming block 77. A cooling medium flow path 86 is formed inside the core block 80 of the movable mold 73. The temperature of the cooling medium sent to the cooling medium flow path 85 of the side surface forming block 77 is lower than the temperature of the cooling medium sent to the cooling medium flow path 84 of the cavity forming block 76 and the cooling medium flow path 86 of the core block 80. Then, by controlling the temperature in the vicinity of the gap surface 83 to be lower than the central portion of the cavity forming surface 87 of the core block 80, the generation of burrs is suppressed. In another embodiment, the central portion and the peripheral portion of the core block 80 may be temperature-controllable in two systems. In that case, the cooling medium flow path 85 of the side surface forming block 77 is not essential. Also for the inlay mold shown in FIG. 8, the width of the gap is adjusted by controlling the relative temperature difference between the core block 80 and the side surface forming block 77 as in the examples shown in FIGS. It is possible.

The present invention is not enumerated one by one, but is not limited to that of the above-described embodiment, and it goes without saying that those skilled in the art also apply modifications made in accordance with the spirit of the present invention. is there. For example, a protrusion as shown in FIG. 5 of Patent Document 1 may be formed in the opening 29 of the cavity forming surface 22 and the gap surface 25 to reduce the height of the burr B in combination with the present invention.

In the present invention, a molded product and a molding material are not selected, but the temperature difference between the core block 16 and the side surface forming block 19 is desirably lower in the range of 5 to 50 ° C. in the side surface forming block. Cooling water is generally used as the cooling medium, but the temperature may be controlled by oil, an electric heater, induction heating, etc., and heat pipes, cooling air, etc. may be used to partially cool the gap. Gas may be used.

It is sectional drawing of the injection compression molding die of this embodiment. It is an expanded sectional view of the principal part of the injection compression molding metal mold | die at the time of shaping | molding. It is a front view of a movable metal mold | die of the injection compression molding metal mold | die of this embodiment. It is a conceptual diagram which shows the injection compression molding system which consists of an injection compression molding die and a temperature control apparatus. It is a figure which shows the example of shaping | molding by the conventional injection compression molding die. It is a figure which shows the adjustment method of the width | variety of the gap | interval part of an injection compression molding die. It is a figure which shows the adjustment method of the width | variety part of an injection compression molding die with FIG. It is sectional drawing of the injection compression molding die of another embodiment.

Explanation of symbols

11, 71 Injection compression mold 12, 73 Movable mold 13, 72 Fixed mold 14, 74 Cavity 16, 80 Core block 17a, 17b, 27, 33, 38a, 38b, 39, 51, 84, 85, 86 Cooling medium flow path 19, 77 Side surface forming block 22, 31, 87 Cavity forming surface 22a Central part 22b Peripheral part 25, 26, 35, 36 Gap surface 29, 30 Opening part 34, 37 Gap part B Burr P Light guide plate

Claims (6)

In an injection compression molding mold for compressing a molding material injected into a cavity formed between a fixed mold and a movable mold,
A side surface forming block whose position relative to the core block can be changed is provided at least on the cavity side via a gap,
An injection compression mold, wherein the opening of the gap is adjusted to a low temperature with respect to the center of the core block. The injection compression molding die according to claim 1, wherein a cooling medium flow path through which a cooling medium is sent from a temperature control device by a separate system is formed in the core block and the side surface forming block. 3. The width of the gap between the core block and the side surface forming block is adjusted by controlling a relative temperature difference between the core block and the side surface forming block. 2. An injection compression mold according to 1. In the adjustment method of the injection compression molding mold for compressing the molding material injected into the cavity formed between the fixed mold and the movable mold,
A core block whose position can be changed relative to the side surface forming block is provided at least on the cavity side via a gap,
An adjustment method for an injection compression molding die, wherein the opening of the gap is adjusted to a low temperature with respect to a central portion of the core block. The injection according to claim 4, wherein a width of a gap portion between the core block and the side surface forming block is adjusted by controlling a relative temperature difference between the core block and the side surface forming block. Adjustment method of compression mold. Injection provided with an injection compression mold for compressing a molding material injected into a cavity formed between a fixed mold and a movable mold, and a temperature control device for controlling the temperature of the injection mold In compression molding system,
In the injection mold, a side surface forming block whose relative position can be changed with respect to the core block is provided at least on the cavity side via a gap,
An injection compression molding system characterized in that the opening of the gap is adjusted to a low temperature with respect to the center of the core block by a temperature control device.

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