JP2013078913A - Method for injection compression molding of resin, and device for injection compression molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for injection compression molding of resin, manufacturing a thick thermoplastic resin molded product without complicating and increasing in size of configurations of a device and a molding die.SOLUTION: In the method for injection compression molding for resin for obtaining an injection molded product by compressing the thermoplastic resin using the molding die whose fixed side has a cavity to be melt-filled with the thermoplastic resin and having a slide core, and an injection compression molding machine, the slide core is slid while moving it back interlocking with a resin amount when the thermoplastic resin is melt-filled, the resin of 20% to 80% of a molding die filling capacity is stored on a leading end side of an injection screw after resin supply is started, and after injecting the resin from an injection cylinder while plasticizing the resin by rotation of the injection screw, the molten resin of 80% to 20% of the molding die filling capacity, stored on the leading end side of the injection screw, is injected at a high speed, and the slide core is slid to the fixed side to mold the injection compression molded product of the thermoplastic resin.

Description

  The present invention relates to a resin injection compression molding method. Furthermore, the present invention relates to a compression injection molding apparatus and a resin injection compression molded body.

  Molding methods using thermoplastic resins include injection molding methods, extrusion molding methods, compression molding methods, and the like, and are widely used as industrial products.

  Conventionally, resin molded products by extrusion molding have been obtained as materials for cutting blocks, round bars, and the like. However, this method has a very poor productivity due to a low production speed. In addition, when an inorganic filler with a small shrinkage is mixed, the void size generated inside the molded product increases due to the difference in shrinkage with a thermoplastic resin with a large shrinkage, or cracks may occur on the surface of the material. Therefore, it could not be a thick resin molding.

  In compression molding, first, a thermoplastic resin powder is put into a mold, heated to the melting temperature of the resin, pressurized, cooled to below the solidification temperature, and the molded product is taken out from the mold. It has been. However, when the powder is melted and pressed, it is difficult to sufficiently deaerate it, and since it contains a lot of voids, it is difficult to obtain a good resin molded body. In addition, since the mold is sufficiently pressurized for deaeration and gradually cooled, this method has a very low productivity because the production speed is slow.

  On the other hand, injection molding is the most widely used molding method for obtaining plastic molded products. However, a molded product obtained by normal injection molding is a thin product, and when the thickness is increased, there is a problem that not only sink marks but also voids are formed in the inner layer portion.

  For example, Patent Document 1 includes a fixed-side template, a movable-side template, and a mold having a slide core. After injecting resin into the cavity in the first step, the fixed-side template and movable An injection molding method including a mechanism for re-clamping after releasing the mold clamping pressure of the side mold plate and relatively changing the position of the slide core in the cavity by the pushing means in the second step is described. Has been.

Patent Document 2 discloses that a resin is filled in a mold at a filling pressure of 50 to 500 kg / cm ² by rotating a screw of an injection molding machine into a cavity formed by a fixed mold and a movable mold. Then, it is cooled below the solidification temperature while being pressurized with a piston in the range of 500 to 3000 kg / cm ² (piston pressure) (compression / cooling step), and after solidification, it is demolded (demolding step) An injection compression molding method is described.

  Patent Document 3 discloses a method in which a mold is provided with a slide mechanism having a slide core that moves in a direction different from the mold clamping direction, and a molten thermoplastic resin is injected into the mold cavity. Have been described. In this method, a resin molding method characterized by compressing the resin in the mold cavity via the slide mechanism and an apparatus for carrying out this method are disclosed.

  However, the background art as described above has the following disadvantages.

  First, in the technique described in Patent Document 1, in order to release the clamping pressure of the fixed side mold plate and the movable side template after the resin injection in the first step, the molten thermoplastic resin is expanded again. However, voids and cracks are generated. If there are voids or cracks in the product, it will cause problems such as damage due to insufficient strength.

  Further, in the technique described in Patent Document 2, the resin pressure filled in the cavity is weak, and voids remain in the cavity or inside the resin. Even if compression / cooling / solidification / demolding is performed as it is, the filling rate is low. Many voids and cracks occur in the product.

  In the technique described in Patent Document 3, since the parting is open at the time of injection filling, the resin leaks and the resin is sandwiched or the filling is insufficient. Therefore, in order to prevent resin leakage, the entire mold needs to have an inlay structure, and the mold shape becomes very complicated. As a result, not only does it become an expensive mold, but also failure tends to occur. Furthermore, in this method, pressure is applied to only a part of the product rather than the entire product, and this is a complementary function of the product portion where a relatively uniform wall pressure is not applied, so a thick resin molded product is created. Not suitable for.

  As described above, in the molding methods used so far, voids are generated in the inner layer portion of the resin molded body made of a thick thermoplastic, which is insufficient to obtain a satisfactory molded product.

JP 58-151228 A Japanese Patent Laid-Open No. 10-296812 JP-A-9-323340

  It is an object of the present invention to provide a resin injection compression molding method capable of producing a thick thermoplastic resin molded product without complicating or increasing the size of an apparatus or a mold. .

  The present invention relates to a resin injection compression method in which an injection molded body is obtained by compressing a thermoplastic resin using a mold having a cavity and a slide core in which a fixed side of the mold is melt-filled with a thermoplastic resin, and an injection molding machine. A molding method in which a slide core slides while retreating in conjunction with the amount of resin when a thermoplastic resin is melt-filled, and further 20 to 80% of the mold filling capacity after the resin supply is started. Is injected from the injection cylinder while the resin is plasticized by rotation of the injection screw, and further from 80% to 20% of the mold filling capacity with the molten resin stored at the front end side of the injection screw. % Is a resin injection compression molding method in which a thermoplastic resin injection compression molding is molded by high-speed injection of% and sliding the slide core to the fixed side.

Another compression resin injection molding method of the present invention is a method in which a thermoplastic resin is compressed by using a mold having a cavity and a slide core in which a fixed side of a mold is melt-filled with a thermoplastic resin, and an injection molding machine. A resin injection compression molding method for obtaining an injection molded body,
(1) 20% to 80% of the mold filling capacity stored on the tip side of the injection screw is injected from the injection cylinder at a high speed,
(2) After the resin supply starts, the resin is stored on the tip side of the injection screw, and after being injected from the injection cylinder while plasticizing the resin by rotation of the injection screw,
(3) A resin injection compression molding method in which a molten resin stored on the tip side of an injection screw is injected at a high speed, a slide core is slid to a fixed side, and an injection compression molded body of a thermoplastic resin is molded.
The total amount of resin used in step (2) and step (3) is 80% to 20% of the mold filling capacity, and the slide core is linked with the amount of resin when the thermoplastic resin is melt-filled. This is a resin injection compression molding method that slides while retreating.

  According to the present invention, it is possible to obtain a thick thermoplastic resin molded body having few voids and cracks.

  According to the present invention, it is not necessary to prepare a considerably large injection cylinder for the mold size, and the economic merit is great.

  According to the present invention, it is possible to obtain a thick thermoplastic resin molded body with less voids and cracks without complicating and increasing the size of the apparatus and the mold.

It is a partial external appearance sectional view which shows an example of the metal mold | die used for the resin injection compression molding method of this invention. It is an example of the flowchart which shows the molding point by the compression resin injection molding method of this invention, and its external appearance sectional drawing. This is a resin block 149 obtained in Example 1. 6 is an additional part of a flowchart showing a molding procedure described in Example 2. FIG. 10 is an additional view of a slide core described in Example 7. The slide core center portion 133a and the slide core outer peripheral portion 133b are divided into two layers. It is an additional figure of the slide core of Example 9. FIG. The center portion of the slide core is spread and divided into at least one outer peripheral portion on the cavity side. It is an additional figure of the slide core as described in Example 10 of this invention. The slide core is divided into three layers at the center of the slide core and the outer periphery of the slide core. It is an example of the external appearance sectional view of the whole injection molding device by the compression resin injection molding method of the present invention.

  The compression resin injection molding method of the present invention will be described.

  The compression resin injection molding method of the present invention uses a mold having a cavity and a slide core in which a fixed side of a mold is melt-filled with a thermoplastic resin, and an injection molding machine to compress the thermoplastic resin and perform injection molding. A resin injection compression molding method for obtaining a body, wherein a slide core slides while retreating in conjunction with a resin amount when a thermoplastic resin is melt-filled, and further, a mold filling capacity of 20 after the start of resin supply. % To 80% of resin is stored on the tip side of the injection screw, and after injection from the injection cylinder while plasticizing the resin by rotation of the injection screw, the mold is filled with molten resin stored on the tip side of the injection screw. This is a resin injection compression molding method in which 80% to 20% of the capacity is injected at a high speed and the slide core is slid to the fixed side to form a thermoplastic resin injection compression molding.

  FIG. 1 is a partial external sectional view showing an example of a mold used in the resin injection compression molding method of the present invention. FIG. 2 is an example of a flowchart showing a molding procedure according to the compression resin injection molding method of the present invention and a partial external cross-sectional view of an apparatus corresponding thereto. FIG. 8 is an example of an external cross-sectional view of the entire injection molding apparatus according to the compression resin injection molding method. Hereinafter, the compression resin injection molding method of the present invention will be described with reference to the drawings, but the present invention is not limited to the embodiments described in the drawings.

  In the compression resin injection molding method of the present invention, the slide core slides while retreating in conjunction with the amount of resin when the thermoplastic resin is melt-filled. In the compression resin injection molding method of the present invention, for example, as shown in FIGS. 1 and 2, a cavity 132 in which a fixed side of a mold is melt-filled with a thermoplastic molten resin 170 and a movable side of the mold are thermoplastic. A mold having a slide core 133 that slides with a part of the resin retreating while being supported by the support spring 137 while the resin is melt-filled is used. The support body that supports the slide core 133 in conjunction with the amount of resin is not particularly limited, and may be a spring, highly elastic rubber, a pneumatic cylinder, or a hydraulic cylinder.

  In the compression resin injection molding method of the present invention, 20% to 80% of the mold filling capacity is stored on the tip side of the injection screw 191 after the resin supply is started, and preferably 20% to 50% of the mold filling capacity. The resin is plasticized and stored on the tip side of the screw 191.

  In the compression resin injection molding method of the present invention, preferably, the total amount of the resin stored on the tip side of the injection screw after the start of resin supply and the resin that is injected at high speed is the same as the mold filling capacity.

  Further, in the compression resin injection molding method of the present invention, the resin is injected from the injection cylinder while plasticizing by the rotation of the injection screw. Preferably, the molten resin is intruded from the injection cylinder 192 into the cavity 132 while being plasticized by the rotation of the injection screw.

  Further, in the compression resin injection molding method of the present invention, 80% to 20% of the mold filling capacity is injected at a high speed with the molten resin stored on the tip side of the injection screw, the slide core is slid to the fixed side, and thermoplasticity is achieved. A resin injection compression molding is formed.

  In the present invention, high-speed injection is an injection molding method in which the filling time in the mold is 0.5 seconds or less or the injection speed is 1000 mm / second or more, and the molten resin 170 in the injection cylinder 192 of the injection molding machine is used. This is a method of injecting into a mold in a short time.

  In compression injection molding, the size of the molding machine is fixed, and filling the mold in the thickness direction is too small because the injection screw is too small and the target cavity is set in one injection. Cannot be filled. Therefore, by injecting while plasticizing by rotation of the injection screw, more resin than the injection screw diameter can be put, but the speed is low and the pressure is insufficient. Therefore, high-speed injection increases the filling speed and maintains a high pressure, thereby reducing voids and cracks. A thick resin block with a high filling rate can be obtained.

Another compression resin injection molding method of the present invention is a method in which a thermoplastic resin is compressed by using a mold having a cavity and a slide core in which a fixed side of a mold is melt-filled with a thermoplastic resin, and an injection molding machine. A resin injection compression molding method for obtaining an injection molded body,
(1) 20% to 80% of the mold filling capacity stored on the tip side of the injection screw is injected from the injection cylinder at a high speed,
(2) After the resin supply starts, the resin is stored on the tip side of the injection screw, and after being injected from the injection cylinder while plasticizing the resin by rotation of the injection screw,
(3) A resin injection compression molding method in which a molten resin stored on the tip side of an injection screw is injected at a high speed, a slide core is slid to a fixed side, and an injection compression molded body of a thermoplastic resin is molded.
The total amount of resin used in step (2) and step (3) is 80% to 20% of the mold filling capacity, and the slide core is linked with the amount of resin when the thermoplastic resin is melt-filled. This is a resin injection compression molding method that slides while retreating.

  In another compression resin injection molding method of the present invention, before resin injection compression molding, the molten resin stored on the tip side of the injection screw 191 after the start of resin supply as shown in FIG. 20% to 80% of the volume is injected at high speed. In another compression resin injection molding method of the present invention, it is preferable that 50% to 80% of the mold filling capacity is injected at a high speed. For example, a resin with high viscosity has low fluidity, so after filling the approximate resin at a high speed by high-speed injection in advance, the molten resin is injected into the cavity 132 from the injection cylinder 192 while plasticizing the shortage by the rotation of the injection screw 191. After filling by injection, the resin 149 filled with high viscosity resin can be obtained by filling the resin with high speed injection.

  In the present invention, high-speed injection is an injection molding method in which the filling time in the mold is 0.5 seconds or less or the injection speed is 1000 mm / second or more, and the molten resin 170 in the injection cylinder 192 of the injection molding machine is used. This is a method of injecting into a mold in a short time.

  In another compression resin injection molding method of the present invention, the total amount of resin used in step (1), step (2), and step (3) is preferably the same as the mold filling capacity.

  In the compression resin injection molding method of the present invention, preferably, the cavity outer peripheral portion is made into a box-shaped solid state, and then filled with a resin having a mold filling capacity while being plasticized by rotation of the injection screw, and further After performing high-speed injection, the slide core is slid to the fixed side.

  In the compression resin injection molding method of the present invention, for example, the outer peripheral portion of the cavity 132 is made into a box-like solidified state in one stage, and the resin of the mold filling capacity is plasticized by the rotation of the injection screw 191 in the second stage. After filling, it is preferable to slide the slide core 133 to the fixed side after performing high-speed injection in the third stage.

  Further, in the resin injection compression molding method of the present invention, the molten core stored on the tip side of the injection screw 191 is injected at a high speed and then the slide core 133 is moved to the fixed side after 10 seconds from 0.1 seconds. In the resin injection compression molding method, it is preferable that the slide core 133 be fixed after 1 second to 3 seconds after high-speed injection with molten resin stored on the tip side of the injection screw 191. Slide to the side.

  In the compression resin injection molding method of the present invention, preferably, the mechanism for sliding the slide core to the fixed side has a protruding rod structure.

  For example, it is preferable that the mechanism for sliding the slide core 133 to the fixed side has a protruding rod structure. Depending on the size of the mold or resin block 149, the number of protruding lots may be one or more, and the number may be the same, and it is only necessary that the resin in the cavity 132 can be compressed. Further, the thickness of the protruding rod is not particularly limited to the shape, and it is sufficient that the protruding rod can move smoothly inside the mold. Further, the power for projecting the projecting rod may be electric or hydraulic, and power outside the molding machine may be used.

  Furthermore, in the resin injection compression molding method described above, it is preferable that the mechanism for sliding the slide core 133 to the fixed side is the movable side mounting plate 121 of the mold together with the protruding rod 136. At this time, the spacer block 130 and the movable side mold plate 122 do not need to be directly joined, and the movable side mold plate 122 is pressed against the fixed-side stripper plate 102 by a support such as a spring 137 attached to the spacer block. Good.

  In the compression resin injection molding method of the present invention, the slide core is preferably divided into two layers of a central portion and an outer peripheral portion, and the central portion slides from the outer peripheral portion on the fixed side by 0.1 mm to 5 mm. For example, as shown in FIG. 5, it is preferable that the slide core 133 is divided into two layers of a central portion 133a and an outer peripheral portion 133b, and the central portion slides on the fixed side from 0.1 mm to 5 mm from the outer peripheral portion.

  Preferably, the central portion of the resin block 149 is in the molten state until the latest, and the central portion 133a of the slide core slides to the fixed side from the outer peripheral portion 133b, whereby the central portion of the resin block 149 can be further compressed. Generation of voids can be suppressed. It is particularly preferable to compress only the central portion where the molten resin remains.

  In the compression resin injection molding method of the present invention, it is more preferable that the center portion slides from the outer peripheral portion to the fixed side from 0.2 mm to 2 mm. More preferably, it is preferable that the center portion slides from the outer peripheral portion by 0.3 mm to 1 mm on the fixed side.

  In the compression resin injection molding method of the present invention, for example, as shown in FIG. 5, the slide core 133 is divided into two layers of a central portion 133a and an outer peripheral portion 133b, and the central portion is 1/10 of the injection product thickness from the outer peripheral portion. It is preferable to slide by 1/100 on the fixed side. More preferably, it is preferable to slide on the fixed side by 1/20 to 1/100. More preferably, it slides on the fixed side by 1/50 to 1/100.

  In the compression resin injection molding method of the present invention, for example, as shown in FIG. 6, it is preferable that the center portion of the slide core 133 is at the cavity side and at least one portion extends from 1 mm to 5 mm and is divided.

  For example, as shown in FIG. 6, it is preferable that the slide core center portion 133a is divided into at least one location from 1 mm to 5 mm outer peripheral portion 133b on the cavity side. By having the slide core center part 133a spread, the slide core center part 133a can always slide on the fixed side from the outer peripheral part 133b, so that the center part of the resin block 149 can be efficiently compressed.

  In the compression resin injection molding method of the present invention, more preferably, in the resin injection compression molding apparatus, the slide core central portion 133a is spread and divided from at least two locations on the cavity side from 2 mm to 4 mm slide core outer peripheral portion 133b. Is preferred. Even more preferably, in the resin injection compression molding apparatus, it is preferable that the slide core center part 133a is spread and divided at least at four locations from 2 mm to 4 mm slide core outer peripheral part 133b on the cavity side.

  In the compression resin injection molding method of the present invention, the slide core is preferably divided into three or more layers of a central portion, an inner peripheral portion, and an outer peripheral portion.

  For example, as shown in FIG. 7, it is preferably divided into three or more layers of a slide core center part 133a, a slide core inner periphery part 133c, and a slide core outer periphery part 133b. Further, the slide core 133 may be divided into three or more divisions such as left, center, and right, or may be divided into three divisions or more such as upper, center, and lower, and the division of the slide core 133 may be asymmetric. When the resin block 149 becomes a large size, the melted state inside the resin block 149 also increases, so it is preferable to compress the center part more strongly in stages, and it is divided into three or more layers. Is preferred.

  Further, in the compression resin injection molding method of the present invention, the thermoplastic resin is polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, nylon 6, nylon 66, nylon 12, nylon 11, aromatic nylon, liquid crystal polymer, polyphenylene sulfide, polycarbonate. Polyethylene, polypropylene, polylactic acid, polystyrene, aromatic polyimide, polyether ether ketone, polyether imide, polyacetal, acrylonitrile butadiene styrene, polyamide imide, polyether sulfone, and mixtures or copolymers thereof are preferable. The thermoplastic resin may contain one or more of glass fiber, glass flake, talc, calcium carbonate, magnesium hydroxide, aluminum hydroxide, carbon fiber, activated carbon, activated carbon fiber, and carbon as an inorganic filler. Good. The mixing ratio is preferably 0 to 80%. Furthermore, the mixing ratio of the inorganic filler is more preferably 10 to 50%.

  In the molded body obtained from the compression resin injection molding method of the present invention, the total volume of voids having a length of 0.2 mm or more contained in the resin injection compression molded body of the resin block 149 is 0.1% of the total volume of the molded body. The following is preferable. Furthermore, it is preferable that the total volume of voids having a length of 0.2 mm or more included in the molded body is 0.05% or less of the total volume of the resin injection compression molded body. More preferably, the total volume of voids having a length of 0.1 mm or more included in the molded body is 0.05% or less of the total volume of the resin injection compression molded body.

  Next, as an example of the compression resin injection molding method of the present invention, the movement inside the mold of FIG. 1 along with the movement of the injection process of FIG. 2 will be described together with the overall view of the injection molding apparatus of FIG.

  Step 10: Move the movable side to the fixed side and tighten the mold.

  Step 20: The molten resin 170 through the spool bush 103 is melted by the rotation of the injection screw 191 as shown in the overall view of the injection molding apparatus in FIG. And the slide core 133 is filled with 50% of the total filling amount while being retracted to the movable side in conjunction with the amount of resin while being supported by the spring 137.

  Usually, in injection molding, the injection capacity is determined by the size of the diameter of the injection screw. However, when a large resin block 149 is made, a considerably large injection screw facility is required. At this time, regardless of the size of the injection screw 191, a large volume of resin can be filled into the cavity 132 by charging the resin plasticized by the rotation of the injection screw.

  Step 30: Thereafter, 50% of the total filling amount is filled in the cavity 132 with the resin injected at high speed. At this time, the slide core 133 is supported by the spring 137 and retracts to the movable side in conjunction with the amount of resin, and is filled by high-speed injection so that sufficient pressure can be applied, so that there is no gap in the cavity 132. Filling becomes possible.

  Step 40: After that, the protruding rod 136 is pushed out to the movable side by the hydraulic cylinder 183, 133 is slid to the fixed side, and the resin block 149 in the cavity is compressed, so that a resin with less voids is obtained.

  Step 50: The hydraulic cylinder 183 protrudes toward the movable side so that the rod 136 moves backward and relaxes.

  Step 60: The movable side is retracted by the mold clamping mechanism 184, the mold is opened and the rod 136 is pushed out to the movable side by the hydraulic cylinder 183. The spring 137 and the slide core 133 are slid to the fixed side, and the inside of the cavity The resin block 149 is taken out.

Method for Measuring Void Existence and Size Measurement was performed using a DAGE (Dage) submicron focus X-ray inspection apparatus XD7500NT950.

Example 1
FIG. 1 shows an external cross-sectional view of the mold used in Example 1. FIG. In FIG. 2, the flowchart which shows the shaping | molding point of Example 1, and the one part external appearance sectional view were shown. In FIG. 3, the resin block 149 obtained by Example 1 was shown. A schematic diagram of the whole injection apparatus used in Example 1 is shown in FIG.

  The resin block 149 was formed by using an injection molding machine 190 as a rectangular parallelepiped having a width of 50 mm, a length of 50 mm, and a thickness of 25 mm. Here, nylon 6 was used as the resin. The mold clamping force of the injector used in steps 10 to 60 is 100 t. The resin filling amount in Step 20 is 80%, and the resin filling amount in Step 30 is 20%.

  0.1 seconds after filling the resin, the projecting rod 136 is used in step 40 to compress the slide core 133 by sliding it to the fixed side with a force of 5 t. In step 50, the projecting rod 136 is slid to the movable side and relaxed. After opening the mold in step 60, the resin core 149 was taken out by sliding the slide core 133 and the spring 137 to the fixed side.

  The presence and size of voids in the resin block are shown in Tables 1 and 2. In the obtained resin block 149, no void of 0.2 mm or more was found. 0.1 to 0.2 mm voids were found to be 0.03%.

Example 2
In Example 1, the material is changed to nylon 66, and after step 10, as step 15 shown in FIG. 4, high-speed injection is performed with a resin filling amount of 20%, and 20% of the remaining 80% of resin amount is step 20 The remaining 80% was carried out in step 30. The same as Example 1 except that compression was performed 3 seconds after resin filling.

  The presence and size of voids in the resin block are shown in Tables 1 and 2. In the resin block 149, no void of 0.2 mm or more was observed. 0.1 to 0.2 mm voids were found to be 0.02%.

Example 3
In Example 2, the material is changed to a rectangular parallelepiped of nylon 12, width 50 mm × length 50 mm × thickness 15 mm, step 15 is followed by step 15 as high-speed injection with a resin filling amount of 60% and the remaining resin amount 40%. Of these, 80% was performed in Step 20, and the remaining 20% was performed in Step 30. It is the same as that of Example 2 except having compressed in step 40 4 seconds after resin filling.

  The presence and size of voids in the resin block are shown in Table 1. In the resin block 149, no void of 0.2 mm or more was observed. Moreover, when the obtained resin block 149 was cut within 1 minute, the exterior of the product resin was formed in a box shape due to the difference in the hue of the resin.

Example 4
In Example 1, the material is changed to aromatic nylon (nylon 9T), the resin filling amount in step 20 is 50%, the resin filling amount in step 30 is 50%, and in step 40 7 seconds after the resin filling. The same procedure as in Example 1 was performed except that compression was performed.

  The presence and size of voids in the resin block are shown in Table 1. In the obtained resin block 149, no void of 0.2 mm or more was found.

Example 5
In Example 1, instead of the polybutylene terephthalate material, the resin filling amount of Step 20 is 20% as a rectangular parallelepiped of width 50 mm × length 50 mm × thickness 10 mm, and the resin filling amount of Step 30 is 80%. The same operation as in Example 1 was performed except that the compression was performed in Step 40 after 10 seconds from the resin filling.

  The presence and size of voids in the resin block are shown in Table 1. In the obtained resin block 149, no void of 0.2 mm or more was found.

Example 6
In Example 1, instead of polypropylene, the resin filling amount in step 20 is 60%, the resin filling amount in step 30 is 40%, and the movable side compressed in step 40 0.2 seconds after resin filling. The slide core 133 is compressed by sliding it to the fixed side using the projecting rod 136 at the same time as the mounting plate 121. After the slide core 133 is slid to the movable side and relaxed in Step 50, the mold is opened in Step 60. Then, the same procedure as in Example 1 was performed except that the resin block 149 was taken out by the slide core 133 and the spring 137.

  The presence and size of voids in the resin block are shown in Table 1. In the resin block 149, no void of 0.2 mm or more was found.

Example 7
In Example 1, instead of polyphenylene sulfide, the slide core center part 133a and the slide core outer peripheral part 133b are divided into two layers as shown in FIG. It implemented similarly to Example 1 except the part 133a sliding to 0.1 mm fixed side from the slide core outer outer peripheral part 133b.

  The presence and size of voids in the resin block are shown in Table 1. In the obtained resin block 149, no void of 0.2 mm or more was found.

Example 8
In Example 7, when the material was compressed in Step 40 instead of nylon 6 / glass fiber = 60: 40, the slide core center portion 133a was 2.2. The same operation as in Example 7 was carried out except that the slide was made to the 5 mm fixed side.

  The presence and size of voids in the resin block are shown in Table 1. In the obtained resin block 149, no void of 0.2 mm or more was found.

Example 9
In Example 7, the material was changed to nylon 6 / carbon fiber (CF) = 85: 15. Further, as shown in FIG. 6, the slide core central portion 133a and the slide core outer peripheral portion 133b are divided into two layers, and the slide core central portion 133a is spread and divided into at least one peripheral portion of 2.0 mm on the cavity side. Then, the same operation as in Example 7 was performed except that the slide core central portion 133a was slid to the fixed side by 0.5 mm from the slide core outer peripheral portion 133b.

  The presence and size of voids in the resin block are shown in Tables 1 and 2. In the obtained resin block 149, no void of 0.2 mm or more was found. 0.1 to 0.2 mm voids were found to be 0.03%.

Example 10
In Example 7, the material was changed to a rectangular parallelepiped of polyphenylene sulfide / magnesium hydroxide = 50: 50, width 70 mm × length 70 mm × thickness 20 mm. Furthermore, as shown in FIG. 7, the slide core was divided into three layers, and the slide core central portion 133a was slid from the slide core inner peripheral portion 133c to a fixed side of 0.8 mm with respect to the thickness of the molded product of 25 mm. Furthermore, it implemented similarly to Example 7 except the slide core outer peripheral part 133b slid to 0.3 mm fixed side with respect to the thickness 25mm of a molded product from the slide core inner peripheral part 133c.

  The presence and size of voids in the resin block are shown in Tables 1 and 2. In the obtained resin block 149, no void of 0.2 mm or more was found. A 0.1 to 0.2 mm void was found to be 0.04%.

Example 11
In Example 1, it was carried out in the same manner as in Example 1 except that the projecting rod 136 was compressed by sliding the slide core 133 to the fixed side with a force of 7 t, and the plastic resin was changed to polyetherimide.

  The presence and size of voids in the resin block are shown in Table 1. In the obtained resin block 149, no void of 0.2 mm or more was found.

Comparative Example 1
In Example 1, the same operation as in Example 1 was performed except that the molten resin 170 was injected into the cavity 132 while plasticizing by the rotation of the injection screw 191 only in Step 20 to set the resin filling amount to 100%.

  The presence and size of voids in the resin block are shown in Tables 1 and 2. In the obtained product, voids of 0.2 mm or more were found to be 1.5% of the total resin amount. A void of 0.1 mm to 0.2 mm was found to be 3.2%.

Comparative Example 2
In Example 2, as Step 15 shown in FIG. 4 after Step 10, the high-speed injection is performed with a resin filling amount of 20%, and the remaining resin amount of 80% is plasticized only by Step 20 by the rotation of the injection screw 191, and the cavity 132. The molten resin 170 was poured into the container (Step 30 was not performed), and the same procedure as in Example 2 was performed except that the resin filling amount was 100%.

  The presence and size of voids in the resin block are shown in Table 1. In the obtained product, voids of 0.2 mm or more were found to be 2.1% of the total resin amount.

Comparative Example 3
In Example 1, the molten resin 170 was injected by high-speed injection only in Step 30 after Step 10 (Step 20 was not executed), but the high-speed injection was repeated four times because the resin amount was insufficient.

  The presence and size of voids in the resin block are shown in Table 1. In the obtained product, voids of 0.2 mm or more were found to be 3.0% of the total resin amount.

Comparative Example 4
In Example 1, the molten resin 170 was injected into the cavity 132 while being plasticized by the rotation of the injection screw 191 in Step 20, and the resin filling amount was 95%. Next, in step 30, it implemented like Example 1 except having performed resin filling amount 5% by high-speed injection.

  The presence and size of voids in the resin block are shown in Tables 1 and 2. In the obtained product, voids of 0.2 mm or more were found in 3.5% of the total resin amount. A void of 0.1 mm to 0.2 mm was found to be 5.2% of the total resin amount.

100: Thermal insulation plate 101: Fixed side template 102: Stripper plate 103: Spool bush
105: Spool runner 107: Ejector guide 109: Pulling link 110: Parting lock 111: Stop bottle 121: Movable side mounting plate 122: Movable side template 130: Spacer block 132: Cavity 133: Slide core 133a: Center of slide core 133b: Slide core outer peripheral part 133c: Slide core inner peripheral part 134: Nest 135a, d, c, d, e, f: Ejector plate 136: Extrusion rod 137: Spring 138: Slide core spreading part 149: Resin block 150: Heater 151: Water pipe 170: Molten resin 181: Hydraulic pump 183: Hydraulic cylinder 184: Clamping mechanism 190: Injection molding machine 191: Injection screw 192: Injection cylinder 193: Hopper

Claims (12)

This is a resin injection compression molding method in which an injection molded body is obtained by compressing a thermoplastic resin by using a mold having a cavity and a slide core in which a fixed side of the mold is melt-filled with a thermoplastic resin, and an injection molding machine. When the thermoplastic resin is melt-filled, the slide core slides back while interlocking with the amount of resin, and after the resin supply starts, 20% to 80% of the mold filling capacity is injected into the injection screw. It is stored at the tip side and injected from the injection cylinder while plasticizing the resin by rotating the injection screw, and then 80% to 20% of the mold filling capacity is injected at high speed with the molten resin stored at the tip side of the injection screw. A resin injection compression molding method in which a slide core is slid to a fixed side to mold an injection compression molding of a thermoplastic resin. The resin injection compression molding method according to claim 1, wherein the total amount of the resin stored on the tip side of the injection screw after the start of resin supply and the resin to be injected at high speed is the same as the mold filling capacity. This is a resin injection compression molding method in which an injection molded body is obtained by compressing a thermoplastic resin by using a mold having a cavity and a slide core in which a fixed side of the mold is melt-filled with a thermoplastic resin, and an injection molding machine. And
(1) 20% to 80% of the mold filling capacity stored on the tip side of the injection screw is injected from the injection cylinder at a high speed,
(2) After the resin supply starts, the resin is stored on the tip side of the injection screw, and after being injected from the injection cylinder while plasticizing the resin by rotation of the injection screw,
(3) A resin injection compression molding method in which a molten resin stored on the tip side of an injection screw is injected at a high speed, a slide core is slid to a fixed side, and an injection compression molded body of a thermoplastic resin is molded.
The total amount of resin used in step (2) and step (3) is 80% to 20% of the mold filling capacity, and the slide core is linked with the amount of resin when the thermoplastic resin is melt-filled. A resin injection compression molding method that slides while retreating. The resin injection compression molding method according to claim 3, wherein the total amount of the resin used in the step (1), the step (2) and the step (3) is the same as the mold filling capacity. Create a state where the cavity outer periphery is solidified, and after filling with resin of the mold filling capacity while plasticizing by rotation of the injection screw, after further performing high speed injection, slide core is fixed side The resin injection compression molding method according to claim 1, wherein the resin injection compression molding method is slid. 6. The resin injection compression molding method according to claim 1, wherein the mechanism for sliding the slide core to the fixed side has a protruding rod structure. 7. The resin injection compression molding method according to claim 1, wherein the slide core is divided into two layers of a central portion and an outer peripheral portion, and the central portion slides on the fixed side from 0.1 mm to 5 mm from the outer peripheral portion. The resin injection compression molding method according to claim 1, wherein the slide core is divided into three or more layers of a central portion, an inner peripheral portion, and an outer peripheral portion. A resin injection compression molded product obtained by the resin injection compression molding method according to claim 1. The resin injection compression molded body according to claim 9, wherein the total volume of voids having a length of 0.2 mm or more contained in the resin injection compression molded body is 0.1% or less of the total volume of the resin injection compression molded body. The mold has a mold with a cavity and a slide core that is melt-filled with thermoplastic resin on the fixed side of the mold, and an injection molding machine. When the slide core is melt-filled with thermoplastic resin, the mold is linked with the amount of resin. Sliding while retreating, and after starting resin supply, 20% to 80% of the mold filling capacity was stored on the tip side of the injection screw, and the resin was injected from the injection cylinder while plasticizing by rotation of the injection screw. Later, 80 to 20% of the mold filling capacity is injected at a high speed with molten resin stored on the tip side of the injection screw, and the slide core is slid to the fixed side to form an injection compression molded body of thermoplastic resin. Injection compression molding equipment. The mold has a mold having a cavity and a slide core that is melt-filled with a thermoplastic resin on the fixed side, and an injection molding machine.
(1) 20% to 80% of the mold filling capacity stored on the tip side of the injection screw is injected from the injection cylinder at a high speed,
(2) After the resin supply starts, the resin is stored on the tip side of the injection screw, and after being injected from the injection cylinder while plasticizing the resin by rotation of the injection screw,
(3) The molten resin stored on the tip side of the injection screw is injected at a high speed, the slide core is slid to the fixed side, and an injection compression molded body of thermoplastic resin is molded,
The total amount of resin used in step (2) and step (3) is 80% to 20% of the mold filling capacity, and the slide core is linked with the amount of resin when the thermoplastic resin is melt-filled. An injection compression molding apparatus that slides while retreating to mold an injection compression molded body of thermoplastic resin.