Mastars

Location: Home » Resources » FAQ
Related news
Mold appearance acceptance standard|Mold manufacturer
Mold appearance acceptance standard|Mold manufacturer
To make a set of molds that can be called tall, we not only need to have a superb mold design level and precise processi...
Mastars|Full Guidelines for Efficient Sheet Metal Design|sheet metal prototyping
Mastars|Full Guidelines for Efficient Sheet Metal Design|sheet metal prototyping
Sheet metal process is one of the common processes used by mastars for rapid prototyping services. The sheet metal desig...
Mastars:What is CNC turning?
Mastars:What is CNC turning?
CNC Turning is a manufacturing process using of computer numerical control (CNC) in which workpiece are held in a chuck ...
Mastars: Full Guide for Selective Laser Sintering
Mastars: Full Guide for Selective Laser Sintering
SLS involves sintering minute pieces of polymer material into a rigid mass depending on a 3D design using a high-powered...
Terminology related to sheet metal processing|metal prototype maker|mastars
Terminology related to sheet metal processing|metal prototype maker|mastars
Mastars as a metal prototype maker, provides rapid sheet metal prototyping,rapid CNC service.rapid prototyping. Sheet...
Popular science of prototype making materials|rapid cnc machining
Popular science of prototype making materials|rapid cnc machining
Mastars specialize in CNC machining /CNC Rapid prototyping/3D printing/Vacuum die casting/metal prototype maker . Famili...
Popular FAQs About NPD(New Product Development)|Rapid prototyping services
Popular FAQs About NPD(New Product Development)|Rapid prototyping services
New Product Development, also known as NDP, is the process of transforming an idea into a viable software product. The p...
Commonly Used Injection Molding Materials You Can Choose
Commonly Used Injection Molding Materials You Can Choose
Mastars can offer a complete service for components and sub-assemblies manufactured in engineering polymersSecondary ope...
Mastars: Detail Guide About Aluminum Injection Molding
Mastars: Detail Guide About Aluminum Injection Molding
Prototypes or real products are produced by the aluminum injection molding technique. The aluminum tooling technique is ...

Contact us

  • Building 6 , Blue Sky Industrial Park, Ditang Road, Shajing Town, Shenzhen City,Guangdong, China (518104)
  • marketing@mastars.com

Detailed explanation of difficulties in medical plastic injection molding (I)

Release date:01 , Jan , 0001 Source:Mastars Pageviews:-
Injection molding in the medical industry is also a branch of the whole injection molding field. After years of development, injection molding in the traditional Chinese medicine industry also has its unique processes and requirements. In the process of plastic injection molding
Injection molding in the medical industry is also a branch of the whole injection molding field. After years of development, injection molding in the traditional Chinese medicine industry also has its unique processes and requirements. In the process of plastic injection molding, how to solve the problem of crazing and bubbles in injection molded products? How to improve the process if the product is not filled enough?

Medical products


How to solve the craze and bubble of injection molded products?

Plastic is disturbed by gas in the filling process, and silver stripes or tiny bubbles often appear on the surface of products or bubbles form in the thick wall of products. The main source of these gases is that the raw materials contain too much water or volatile substances or lubricants, or the material temperature is too high, the plastic is heated for a long time, and degradation occurs, resulting in decomposition gas.

1. Equipment

The nozzle hole is too small, the materials salivate or wire drawing at the nozzle, the machine barrel or nozzle has obstacles or burrs, and the friction heat is generated when the high-speed material flow passes, causing the material to decompose.

2. Mold

(1) Due to design defects, such as poor gate position, too small gate, asymmetric gate layout of multi gate parts, small runner, unreasonable mold cooling system, too large mold temperature difference, etc., the flow of molten material in the mold cavity is discontinuous, blocking the air channel.

(2) The mold parting surface is lack of necessary exhaust channels, or the exhaust channels are insufficient, blocked, and in a poor position. There is no processing gap such as inserts and thimbles to exhaust, resulting in the air in the cavity cannot leave at the same time when the plastic enters.

(3) The surface roughness of the mold is poor, and the friction resistance is large, causing local hot spots and decomposing the passing plastic.
【Tag of this article】:Injection molding medical industry sheet metal prototyping prototyping tooling injection tooling injection molding plastic extrusion pressure die casting metal stamping MIM
【Editor】:Mastarsall rights reserved:Please indicate the source