Crystalline material injection molding self-reinforcement process and equipment

A technology of crystalline materials and equipment, which is applied in the field of crystalline material injection self-reinforcing technology and equipment, can solve problems such as poor mechanical properties, and achieve the effects of ensuring mechanical properties, increasing crystallinity, and avoiding pollution

Active Publication Date: 2018-03-06
CHENGDU MEDART MEDICAL SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by this invention is that the medical precision parts obtained by the traditional injection molding process present an almost amorphous shape and poor mechanical properties. The purpose is to provide a self-reinforcing process and equipment for injection molding of crystalline materials. The extrusion is combined so that the thermoplastic material is extruded through the second molding at its crystallization temperature during the injection molding process, and different compression ratios are controlled (that is, the diameter L of the injection cavity and the diameter D of the gate valve. Ratio) to promote its rapid crystallization orientation and later heat treatment to fix its orientation state and release internal stress, which can meet the mechanical properties and stability requirements of medical special-shaped precision injection molded parts of crystalline thermoplastic materials for surgical implants, and has a wide range of applications

Method used

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  • Crystalline material injection molding self-reinforcement process and equipment
  • Crystalline material injection molding self-reinforcement process and equipment
  • Crystalline material injection molding self-reinforcement process and equipment

Examples

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Effect test

Embodiment 1

[0035] Such as Figure 1~5 As shown, the present invention provides a kind of injection molding equipment, comprises the movable mold 7 that moves up and down and fixed mold 8, and movable mold 7 is arranged on the top of fixed mold 8, and fixed mold 8 is provided with the injection mold cavity 2 that distributes left and right and The molding cavity 4, the injection molding cavity 2 and the molding cavity 4 are connected through a glue port, and a glue port valve 3 is arranged on the glue port. The cavity compression slider 1 is also provided on the fixed mold 8, and the cavity compression slider 1 is used for extruding the injection molding blank material in the injection cavity 2 into the molding cavity 4 through the glue port. The movable mold 7 is provided with a hot runner 5 , and the output end of the hot runner 5 communicates with the injection molding cavity 2 . A valve needle 5-1 is also provided on the hot runner 5, and the valve needle 5-1 is used to control the s...

Embodiment 2

[0037] Such as Figure 1~5 As shown, the specific steps of the injection molding self-reinforcement process of crystalline material based on the injection molding equipment provided by the present invention are as follows:

[0038] Step 1: The movable mold 7 and the fixed mold 8 are in the closed state, and the cavity compression slider 1 is in the reset state to leave a space for the injection molding blank. The compression ratio can be adjusted by adjusting the initial position of the cavity compression slider 1, and the rubber port The valve 3 is in a closed state to ensure the design size of the injection molding blank; the injection molding raw material that is easy to crystallize is melted into the hot runner 5 through high temperature melting, and then into the injection cavity 2, and the injection molding blank is formed, such as figure 1 shown;

[0039] Step 2: After the injection molding of the blank is completed, close the hot runner valve needle 5-1 to prevent the...

Embodiment 3

[0044] Using poly-L lactic acid material as raw material, adopt the process steps of embodiment 2 to produce a kind of absorbable skull lock, and adjust the compression ratio to be 1~5 to obtain the injection molding sample; Qi Jingang, Zhou Ying, et al. Effect of hot-pressing temperature on the structure and mechanical properties of polylactic acid fracture internal fixation materials [J]. Plastic Industry, 2015,43(10):63-66) The injection molded sample was used as a comparison sample Parts, and molded preparation polylactic acid / bacterial cellulose derivatives composite material [J]. Plastics, 2010,39 (5): 62-64.) The obtained molded sample is used as a comparison sample, and the injection molded sample of the present invention The performance parameters of the comparison sample were tested, as follows.

[0045] (1) Crystallinity of injection molded parts

[0046] The ADVANCW-D8X X-ray diffractometer produced by German Bruker Company was used to test the crystallinity of in...

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Abstract

The invention discloses a crystalline material injection molding self-reinforcement process. The process includes the steps of: 1, injection molding mould pressing shear induced crystallization treatment: subjecting an injection molding raw material in a heated molten state to injection moulding, then conducting mould pressing extrusion on a semisolid injection molded blank material into a moldingcavity; and 2, stable molding treatment: heating the molding cavity to complete thermal stability treatment of a molded part. The process provided by the invention combines injection molding and mould pressing, carries out second mould pressing extrusion at a crystallization temperature in the injection moulding process of a thermoplastic material, and controls different compression ratios to promote rapid crystallization orientation and utilizes later heat treatment to fix the orientation state and release internal stress, and the product can satisfy the requirements of surgical implantationcrystalline thermoplastic material medical irregular precision injection molded parts for mechanical properties and stability, and has a wide range of application.

Description

technical field [0001] The invention relates to an injection molding process, in particular to a crystalline material injection molding self-reinforcing process and equipment. Background technique [0002] Polylactic acid materials have good biocompatibility and biodegradability. In the past 10 years, although poly-L-lactic acid for surgical implants has been used as a material for implantable devices, tissue skeletons and other products, its initial mechanical properties are stable. The performance of each product is different, especially the parts that need to bear weight and force limit their use. At present, the processing method of poly-L-lactic acid medical special-shaped precision parts for surgical implants is mainly injection molding. Poly-L-lactic acid is heated above its melting point, then molded into the desired shape, and finally cooled to stabilize its dimensions. Cooling optically pure poly-L-lactic acid for surgical implants from the molten state (such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/26B29C45/27B29C47/28B29C45/40B29C45/76B29C45/77B29C45/78B29K67/00B29C48/34
CPCB29C45/2602B29C45/27B29C45/4005B29C45/76B29C45/77B29C45/78B29C48/30B29C48/34B29C2945/76588B29C2945/76498B29C2945/76531B29K2067/00
Inventor 王军杨满吴建张伟
Owner CHENGDU MEDART MEDICAL SCI CO LTD
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