Tag - china custom injection molding

How to prevent stripe defects in precision injection molding?

As we all know, the stripe defect in mold is a very serious matter, it will directly affect the accuracy of injection molding, and will also lead to product scrap, so we must pay attention to. So, how can we avoid this defect?
Proper design, careful processing, reasonable mold repair and timely nitriding are the key measures to prevent the occurrence of stripe defects in precision injection molding.
It should be processed in strict accordance with the requirements of the drawing, […]

Discoloration of common problems in plastic injection molding

Discoloration refers to the inconsistency between the surface color of the formed parts and the required color. Discoloration may be caused by a variety of reasons, including injection molding machine, plastic mold, injection process and raw materials.
(1) Injection molding machine
① The equipment is not clean and needs cleaning. Dust or powder deposited in the barrel contaminates and discolors the material;
② Temperature control fault caused by temperature controller or heating system fault;
③ There are obstacles in the barrel, which lead […]

What will be caused when injection mold testing in many times?

The design of the injection mold was not fully collectively reviewed, and the structure of the injection mold was unreasonable, which caused the injection mold to undergo multiple improvements after the test, which made the injection mold cost exceed the budget.
If it can be solved after several improvements, it is relatively fortunate. There are many cases that are unsatisfactory, and even the injection molds have to be scrapped and reworked. This cost cannot be controlled.
There are also cases where […]

Warpage and deformation of common problems in injection molding

Warpage and deformation of injection products are very difficult problems. Mainly from the mold design to solve the problem, and the forming conditions of the adjustment effect is very limited. The causes and solutions of warpage and deformation can refer to the following items:
1) When the deformation is caused by the residual stress caused by the forming conditions, the stress can be eliminated by reducing the injection pressure, increasing the mold temperature, increasing the resin temperature or annealing.
2) When […]

Why plastic parts have deformation when processing

In order to ensure the normal processing of plastic parts, operators need to understand the cause of the abnormal appearance in this process, the better to avoid the abnormal appearance during processing. Below, JasonMould share you the causes of deformation in processing:
 
 

During the process of molding, the surplus material is spilled into the gap between the mold and the mold surface and retained on the plastic part. A kind of linear trace on the surface of plastic parts, is […]

Bubbles of common problems in injection molding

According to the causes of bubbles, the solutions are as follows:
1) When the wall thickness of the product is large, the cooling speed of the outer surface is faster than that of the center part. Therefore, with the cooling process, the resin in the center part shrinks and expands to the surface, resulting in insufficient filling in the center part. This is called a vacuum bubble. The solutions are as follows:
a) According to the wall thickness, determine the reasonable […]

How to solve the surface sag in 2K mold

The basic reason for surface sag: from the perspective of plastics, when the plastic cools and shrink, insufficient filling will lead to product surface sag or internal cavity.
 
The causes and solutions of defects are different depending on the location of sag.
 

When the sag occurs at the final cooling position of the thick-walled product, or at a distance from the sprue:

 
Cause analysis: The typical thick wall and the surface sag or hole far from the sprue are usually due to […]

Discoloration of common problems in plastic injection molding

Discoloration refers to the inconsistency between the surface color of the formed parts and the required color. Discoloration may be caused by a variety of reasons, including injection molding machine, plastic mold, injection process and raw materials.
(1) Injection molding machine
① The equipment is not clean and needs cleaning. Dust or powder deposited in the barrel contaminates and discolors the material;
② Temperature control failure caused by temperature controller or heating system failure;
③ There are obstacles in the barrel, which lead […]

Causes and solutions for swelling and bubbling of injection molding parts

Some plastic parts after demoulding, have swelling or bubbling on the back of metal insert or in the extra thick parts. This is due to the expansion of the released gas under the action of internal pressure on the plastic which has not been completely cooled and hardened. JasonMould works with you for details.
 
Solutions:
 

Effective cooling. Reduce mold temperature, prolong tooling time, reduce drying and processing temperature.

 

Reduce the filling speed, reduce the forming cycle and reduce the flow resistance.

 

Increase the […]

Why is it so expensive to open a set of plastic mould?

“Why is the cost of mold opening so expensive” is probably the voice of most customers! But in the eyes of Xiaobian, there is a trace to follow when opening a set of plastic mold.
1) Plastic mold belongs to customized products, not ordinary standard parts.
2) The difficulty degree of product structure determines the difficulty degree of mold processing. The more complex the mold processing, the more manpower and material resources it takes.
3) The cost of mold steel used in […]