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Tearing type double-hole polypropylene combined cover and injection molding process thereof

A combination cap and polypropylene technology, which is applied in capping, bottle filling, bottle/container caps, etc., can solve the problems of internal stress and poor plasticity of combined caps, and achieve the effect of eliminating internal stress and improving plasticity

Inactive Publication Date: 2020-03-24
HUNAN NOVOL MEDICINE CHARTERS MATERIAL SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a tear-off double-hole polypropylene composite cover and its injection molding process, which solves the problem that the pressure in the cavity of the existing composite cover is not necessarily equal to the external pressure when the product is demolded. Pressure, where the difference between the pressure inside the mold cavity and the outside pressure is the residual stress, and the plasticity of the combined cover is poor, and it also contains the problem of internal stress

Method used

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  • Tearing type double-hole polypropylene combined cover and injection molding process thereof
  • Tearing type double-hole polypropylene combined cover and injection molding process thereof

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Embodiment 1

[0032] Such as Figure 1-2 As shown, the present invention provides a technical solution: a tear-off double-hole polypropylene composite cover includes a composite cover 1 and a tear protection sticker 2, and the composite cover 1 is integrally molded by an injection molding machine; the described The tear protection sticker 2 is made of PVC hot-pressed aluminum film, which is bonded to the top of the composite cover 1; the composite cover 1 is set in a stepped shaft shape as a whole, and the maximum diameter of the composite cover 1 is φ32, and its thickness is 2mm; The overall height of the combination cover 1 is 18mm, and the middle diameter of the combination cover 1 is φ28; the combination cover 1 is composed of an inner cover and an outer cover.

Embodiment 2

[0034] The injection molding process of the tear-off double-hole polypropylene composite cover includes the following steps:

[0035] Step 1: Preparation process;

[0036] Step 2: injection molding;

[0037] Step 3: Processing after molding.

[0038] The Step 1: preparation process, includes the following steps:

[0039] The first step: analyze the quality of the material, and check the water content and various performance indicators according to the technical performance requirements of the composite cover;

[0040] The second step: material preheating;

[0041] The third step: cleaning of the barrel, before injection molding, the empty injection method is used to clean the barrel.

[0042] Said step 2: injection molding, including the following steps:

[0043] The first step: plasticizing, the granular plastic is heated and melted in the barrel to form a viscous liquid melt;

[0044] Step 2: Injection filling, the screw advances rapidly to inject the plastic melt into...

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Abstract

The invention discloses a tearing type double-hole polypropylene combined cover and an injection molding process thereof. The tearing type double-hole polypropylene combined cover comprises a combinedcover and a tearing protective sticker. In the injection molding process, pressure maintaining feeding is adopted, melt shrinks due to cooling, but due to the fact that a screw process continues to move forwards slowly, the melt in a charging barrel continues to be injected into a cavity to meet the requirement for supplementing feeding. A pouring gate is cooled after being frozen so as to eliminate the difference between the pressure in the die cavity and the external pressure as residual stress; after the combined cover is subjected to injection molding, a conveying belt is used for carrying the combined cover exhaust fan for cooling, ultraviolet rays are used for sterilization, and then the combined cover stands for 24 hours at the normal temperature, so that the internal stress of thecombined cover is eliminated, and the plasticity of the combined cover is improved.

Description

technical field [0001] The invention relates to the technical field of a tear-off double-hole composite cover, in particular to a tear-off double-hole polypropylene composite cover and an injection molding process thereof. Background technique [0002] As a packaging tool, the bottle cap must have good sealing performance. The existing plastic combined anti-counterfeiting bottle cap consists of two parts: the outer cover assembly and the lower part of the bottle cap. The general medical bottle combination cap is made of injection molding. become. [0003] However, when the existing combined cover is demolded, the pressure in the mold cavity is not necessarily equal to the external pressure. The difference between the pressure in the cavity and the external pressure is the residual stress, and the plasticity of the combined cover is poor, and it also contains internal stress. . Contents of the invention [0004] (1) Solved technical problems [0005] Aiming at the defici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/17B29C45/73B29C45/77B65D41/00
CPCB29C45/17B29C45/1753B29C45/73B29C45/77B29C2945/76498B65D41/00
Inventor 夏岳韬何小平
Owner HUNAN NOVOL MEDICINE CHARTERS MATERIAL SCI TECH