Technical method for molding super-thick plastic parts

A molding process and technology of plastic parts, applied in coating and other directions, can solve problems such as being unable to meet the large-scale needs of the market and users, affecting the normal performance of functions, and easily generating air bubbles, achieving excellent mechanical properties, mild conditions, and reducing molding speed. Effect

Inactive Publication Date: 2010-01-06
NANJING HUAGE ELECTRONICS & AUTOMOBILE PLASTIC IND
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the mold design and molding are carried out according to the traditional injection molding process, due to the characteristics of the material and the thick wall thickness of the product, air bubbles are easily generated inside the product, which is not only unsightly, but also seriously affects the normal performance of the function. The finished product of the injection molding process The production rate is only about 10%, which makes the production cost high and the output low, which cannot meet the large-scale needs of the market and users

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Technical method for molding super-thick plastic parts
  • Technical method for molding super-thick plastic parts
  • Technical method for molding super-thick plastic parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A manufacturing process for ultra-thick transparent parts, the shape of which is as follows figure 1 As shown, the size requirements of each part are shown in the table below.

[0014]

[0015] The above parts are injection molded using the following process parameters.

[0016] a. Use a large-diameter main sprue on the mold. The diameter of the main sprue in this example is 18mm.

[0017] b. Control the injection speed to 4mm / s;

[0018] c. Keep the pressure for 95 seconds under the pressure of 23 Pa / cm2 after the injection;

[0019] d. After the pressure holding is completed, it is cooled for 52 seconds and then removed from the mold;

[0020] e. Heat treatment: put the demoulded product into an oven with an oven temperature of 55°C, and take it out after standing for 1 hour.

[0021] According to the characteristics of the product structure, it is advisable to use the main gate to feed the material when opening the mold. The injection molding equipment is Dong...

Embodiment 2

[0023] A manufacturing process of an ultra-thick transparent part. The appearance of the part is shown in Figure 2, and the size requirements of each part are shown in the table below.

[0024]

[0025] The above parts are injection molded using the following process parameters.

[0026] a. Use a large-diameter main sprue on the mold. The diameter of the main sprue in this example is 15mm.

[0027] b. Control the injection speed to 5mm / s;

[0028] c. Keep the pressure for 80 seconds under the pressure of 20 Pa / cm2 after injection;

[0029] d. After the end of pressure holding, cool down for 45 seconds and demould;

[0030] e. Heat treatment: Put the product after demoulding into an oven with an oven temperature of 60°C, and take it out after standing for 1 hour.

[0031] According to the characteristics of the product structure, it is advisable to use the main gate to feed the material when opening the mold. The injection molding equipment is Donghua's 220T injection mol...

Embodiment 3

[0033] A manufacturing process of an ultra-thick transparent part. The appearance of the part is shown in Figure 2, and the size requirements of each part are shown in the table below.

[0034]

[0035] The above parts are injection molded using the following process parameters.

[0036] a. Use a large-diameter main sprue on the mold. The diameter of the main sprue in this example is 20mm.

[0037] b. Control the injection speed to 3mm / s;

[0038] c. Hold the pressure for 120 seconds under the pressure of 25 Pa / cm2 after the injection;

[0039] d. After the end of pressure holding, cool for 60 seconds and demould;

[0040] e. Heat treatment: Put the demoulded product into an oven with an oven temperature of 50°C, and take it out after 2 hours.

[0041] According to the structural characteristics of the product, it is advisable to use the main gate to feed the material when opening the mold. The injection molding equipment is the 450T injection molding machine of Donghua ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a technical method for molding super-thick plastic parts, which has the advantages of simple operation, high rate of finished products and lower production cost. The method comprises the following steps: utilizing a main pouring port with large diameter on a mould during injection molding, wherein the diameter of the main pouring port is 15-20 mm which is 300-400 percent of the diameter of a main pouring port with normal diameter; in injection, controlling the emission speed at 3-5 mm / s which is 20-30 percent of normal speed; pressurizing the mould for 80-120 seconds under the pressure of 20-25 Pa / square centimeter after emission, and cooling for 45-60 minutes after pressurization for demoulding; and directly carrying out heat treatment after demoulding.

Description

technical field [0001] The invention relates to a molding process method of a plastic part, more specifically to a molding process method of an ultra-thick plastic part. Background technique [0002] General-purpose polystyrene (GPPS) is colorless, odorless, tasteless and shiny, transparent particles with light weight, low price, low water absorption, good coloring, dimensional stability, good electrical properties, and products Transparent, easy to process, etc., can be used in daily necessities, electrical appliances, instrument shells, toys, lamps, household appliances, stationery, cosmetic containers, indoor and outdoor decorations, fruit plates, optical parts (such as prisms, lenses), lens windows and molding, Car lights, telecommunications accessories, electric frequency capacitor films, high frequency insulating materials, television containers, wave guides, chemical containers, etc., have become one of the most widely used plastics. With the development of product d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/27B29C45/76B29C71/02
Inventor 周国辉陈浩陆跃忠
Owner NANJING HUAGE ELECTRONICS & AUTOMOBILE PLASTIC IND
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap