Plastic Injection Molding | China Plastic Injection Molding Companies With Tooling And Injection Moulding Die Makers

16 Mar

The key of injection molding for precision plastic parts of car

Plastic parts of cars, For example, the coil frame, base, fuse box, lamp holder, chip fuse, central distribution box, sheath, push frame, reed bar assembly and outer cover are mostly injection molding. Because of their high design accuracy, they cannot be injected into conventional injection molding, but precision injection molding technology must be adopted. In order to ensure the performance, quality and reliability of the precision plastic parts of the car, the injection molding of plastic products with high […]

05 Mar

Defect analysis and elimination of molding flash

What is molding flash?
Molding flash, also known as overflow, overflow, seam and so on, mostly occurs in the opening and closing position of the mold, such as the interface of the mold, the sliding part of the slider, the gap of the insert, the hole of the ejector pin and so on. If the flash is not solved in time, it will be further enlarged, resulting in local collapse of the impression die, which may eventually cause permanent damage. […]

03 Mar

Analysis and elimination of crack and whiten injection defects

What are crack and albino injection defects?
Cracking is a common defect of plastic products, which is mainly caused by stress deformation. There are mainly residual stress, external stress and stress deformation caused by external environment. As shown in the figure
Analysis and elimination of crack and whiten injection defects
1) The surface residual stress is too large
Excessive residual stress is the main cause of surface cracking of plastic parts. In the process operation, the process parameters should be set according to […]

01 Mar

How to solve the side wall dent of injection molding products

The “dent” is caused by the local shrinkage after the gate is sealed or caused by the lack of material injection. The depression or micro depression on the surface of injection molded products is an old problem in the process of injection molding.
Dents are generally caused by the increase of the shrinkage rate of plastic products caused by the increase of the wall thickness. They may appear near the external sharp corner or the sudden change of the wall […]

24 Feb

Common quality problems of injection parts

A. Appearance:
Product surface often appears: shrinkage, drape, mixed color, mixed point, drag pattern, mold pattern, water pattern (material pattern), oil stain, crack, water pattern, air pattern, flow pattern, water pattern, deformation, color difference, uneven color, scratch, top white, top height, top piercing, blind hole, broken column, bubble, fogging, brittle, air pattern, uneven erosion pattern, unclear word mark, lack of glue, nozzle damage, residual glue deviation Long wait

B. In terms of structure:
1. Screw column position: lack of glue, flapping edge, […]

22 Feb

How to choose the best gate location

1. The gate must be designed in the area with the largest wall thickness.
2. The gate should not be set near the high stress area.
3. For the long parts, especially for the reinforced mixture, if the motor is possible, the gate should be set along the longitudinal direction rather than the transverse direction or in the center.
4. If there are two or more cavities, the parts and gate should be symmetrically arranged along the sprue.
5. For axially symmetrical parts, […]

01 Feb

Defect analysis and elimination of black specks

What is black specks?
Black specks are dark or dark streaks on the surface of products, and black streamline appears along the flow direction near the gate, which is a surface quality problem, as shown in the figure
Black spot and black stripe
Defect analysis and elimination of black specks
1) The melt temperature is too high
If the material temperature is too high, the melt will overheat and decompose, forming carbides. In order to avoid the overheat decomposition of the melt, the temperature […]

12 Jan

How to solve the problem of insufficient filling in the process of plastic injection molding

In the process of plastic injection molding, there will be a variety of problems, and insufficient filling is a phenomenon with high probability, so what is the reason for insufficient filling? How should we solve this problem? Mr. Fu, a teacher of Jiangsu injection molding factory for many years, shared it with you.
Plastic injection processing
1、 The main reasons for insufficient filling in plastic injection molding are as follows:
1. Insufficient resin capacity.
2. There was insufficient pressure in the cavity.
3. The […]

04 Jan

Analysis of cooling time in injection molding

The cooling time of plastic injection molding products accounts for about 80% of the whole injection molding production cycle. If the injection molding parts are cooled properly, the product quality is qualified. If the cooling is not qualified, it will lead to warpage deformation or surface defects, which will affect the dimensional stability of the products. The injection molding manufacturers analyze the cooling of injection molding parts for you.

The cooling time of injection molded parts generally refers to the […]

31 Dec

Causes and solutions of bubbles in injection molding

In the process of injection molding, bubble is a very common phenomenon, light is harmless, heavy directly affects the actual quality of injection molding products.

1、 Causes of bubbles in injection molding
In the process of injection molding, when the wall thickness of the product is large, the cooling speed of the outer surface is faster than that of the central part. Therefore, with the cooling process, the resin in the central part shrinks and expands to the surface, resulting in […]