Multipoint nitrogen charging injection molding technology

A multi-point, process technology, applied in the direction of coating, etc., can solve the problems of unsatisfactory appearance color of products, inconsistent wall thickness shrinkage of plastic parts, high requirements for mold equipment, etc., to achieve full appearance color, shorten molding cycle, and improve surface quality. Effect

Inactive Publication Date: 2016-07-06
上海精卫模具有限公司
View PDF5 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention aims to solve the problem that the traditional plastic product injection molding process is prone to produce inconsistent wall thickness shrinkage, uneven stress, easy deformation and warping of plastic parts, low precision, unsatisfactory appearance and color of the product, and the solid injection molding process has high req

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
  • Multipoint nitrogen charging injection molding technology
  • Multipoint nitrogen charging injection molding technology

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] The specific implementation manners of the present invention will be further described below in conjunction with the drawings and examples. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0029] Using the multi-point nitrogen-filled injection molding process of the present invention to inject a plastic product with four strips arranged in parallel in a theme, comprises the following steps:

[0030] Step (1): In the mold clamping state, form 4 mold cavities arranged in parallel in the form of long strips, and the four sides of the long strips are provided with large rounded corners to avoid stress concentration during the injection molding process. The plastic melt enters the mold cavity from the mold gate, and the plastic melt meets the lower temperature mold wall to form a thinner solidified layer.

[0031] Step (2): The mold is equipped w...

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

No PUM Login to view more

Abstract

The invention discloses a multi-point nitrogen-filled injection molding process, which comprises the following steps: (1) making the plastic melt enter the mold cavity from the mold gate in the mold clamping state; (2) filling the mold cavity with the plastic melt When the cavity reaches 75% to 95% volume, the inert gas enters the molten plastic melt through the inlet of the air channel, and pushes the unsolidified plastic melt in the center into the mold cavity that has not yet been filled; (3) the inert gas in the plastic melt Form an air passage; (4) Under the pressure-holding state, the inert gas in the air passage compresses the plastic melt, replenishes the material to ensure the appearance of the part is complete, and continues to maintain pressure until the plastic melt cools down; (5) The plastic melt is cooled and formed Finally, the inert gas in the airway is exhausted to obtain plastic products. The invention solves the problem that the traditional injection molding process of plastic products is prone to produce inconsistent wall thickness shrinkage, uneven stress, easy deformation and warping of plastic parts, low precision, unsatisfactory appearance and color of products, and the solid injection molding process has high requirements for mold equipment and is expensive. material problem.

Description

technical field [0001] The invention relates to the field of mold injection molding technology for plastic products, in particular to a multi-point nitrogen-filled injection molding technology. Background technique [0002] Plastic products are inseparable in people's production and life. This supply-demand relationship also promotes the rapid development of the injection molding industry. Focusing on the scarcity of oil in the future, cost control is a must for businesses. Since injection molding products are widely used in various industries, the requirement for the precision of plastic parts has also become a difficult problem in the industry. Traditional plastic injection molding is to inject molten plastic into the mold cavity through high-pressure mechanical energy, but the stress generated during injection, pressure holding, cooling, and shrinkage is different from the shrinkage of the wall thickness of the plastic part, causing the plastic part to deform and warp. I...

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
IPC IPC(8): B29C45/00B29C45/17
CPCB29C45/0025B29C45/1704
Inventor 冷金财陈向军
Owner 上海精卫模具有限公司
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