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

29 Apr

Defect correction of injection mold products

In the process of plastic production, various reasons lead to different defects of various products. The following are common product defects and solutions:
There are some non design reasons, such as mold temperature, material temperature, high temperature, insufficient holding time and residual stress, etc. when the deformed products are out of the mold. The product wall thickness and uneven shrinkage, improper gate position and ejector position, and mold sticking must be considered in the design.
The vacuum state caused by too […]

24 Apr

Analysis and elimination of injection defects of unstable gauge

What is unstable gauge?
Dimensional instability (unstable gauge) refers to the change in the size of plastic parts between each batch of molded products or between each cavity molded products produced by each mold under the same injection molding machine and molding process conditions. As shown in the figure:
The change of product size is caused by abnormal equipment control, unreasonable injection molding conditions, poor product design and material performance change.
Analysis and elimination of injection defects of unstable gauge
1) Inconsistent conditions […]

19 Apr

Defects and abnormal phenomena of injection molding

The defects and abnormal phenomena of injection molding are finally reflected in the quality of injection molded products. The disadvantages of injection molded products can be divided into the following points:
(1) Insufficient product injection;
(2) Product overflow;
(3) Product dents and bubbles;
(4) The product has contact mark;
(5) The product is brittle;
(6) Plastic discoloration;
(7) The products have silver wire, stripes and flow marks;
(8) The product gate is muddy;
(9) Product warpage and shrinkage;
(10) The product size is not accurate;
(11) Product paste in mold;
(12) […]

08 Apr

Product quality control requirements of injection molding department

“Product quality is everyone’s responsibility”. High quality products are produced, managed and controlled, not inspected. The goal is excellent quality, customer satisfaction, and one-time molding pass rate of more than 98%. To achieve the above goals, all employees must improve their quality awareness and sense of responsibility, and do a good job according to the following requirements:
1. When the beer is opened, it is necessary to adjust the machine according to the process parameters in the “forming process record”. […]

06 Apr

Process flow of ABS plastics

ABS, commonly known as acrylonitrile butadiene styrene, is made by copolymerization of acrylonitrile butadiene styrene. Due to the different proportions of the three monomers, ABS with different properties and melting temperature can be expanded to ABS with different uses and properties, such as impact grade, heat resistance grade, flame retardant grade, transparent grade, reinforced grade, electroplating grade, etc., if it is blended with other plastics or additives.
The fluidity of ABS is between PS and PC. the fluidity of ABS […]

30 Mar

Responsibilities of mold tester in injection molding department

1. Be directly responsible to the supervisor / foreman, report to him, obey his work arrangement and management;
2. Strictly abide by the management system of the injection molding department and the company, the staff code of the injection molding department and the staff safety code of the injection molding department;
3. Make good preparation for materials before mold test, and trial produce each set of mold according to the requirements of “mold test notice”;
4. According to the structure of each […]

26 Mar

Difference between two color mold and over mold

A. Two color mold: two kinds of plastic materials are injected on the same injection molding machine, which are molded twice, but the product only produces the mold once. Generally, this molding process is also called double injection molding, usually completed by a set of moulds, and requires a special two-color injection molding machine.
Over molding): two kinds of plastic materials are not necessarily injected on the same injection molding machine, and are molded in two times; after the product […]

24 Mar

Discussion on surface pretreatment and coating process of ABS plastic products

More than 80% of the exterior decoration parts of motorcycle (Scooter) are ABS plastic products, so the coating quality directly affects the market competitiveness of motorcycles. This paper introduces the pretreatment and coating technology of ABS plastic products, and analyzes and discusses some special requirements for the pretreatment and coating of ABS plastics due to the particularity of ABS plastic materials.
Surface properties
ABS (acrylonitrile, butadiene and styrene terpolymer) is a thermoplastic resin plastic, which has high mechanical strength and good […]

23 Mar

Technology analysis of mobile phone mold making

1.Selection of mobile phone shell material
The mould of mobile phone is expensive, and the material price of the product is not very expensive; the role of the shell in the mobile phone: it is the support frame of the whole mobile phone; positioning and fixing the electronic components; carrying all other non shell parts and limiting. The shell is usually molded by engineering plastics.
1. Common materials for shell
Abs: high fluidity, cheap, suitable for parts with low strength requirements (components […]

19 Mar

Solution to the problem of air marks in PC injection parts

The reason why air marks are easy to appear at the water inlet of PC parts has been described earlier, which is caused by too fast glue injection speed. Therefore, in order to solve the problem of air marks at the water inlet, we must try to reduce the injection speed without producing chatter marks and material shortage.
For this reason, we should first ensure that the melt temperature is high enough. In the case of no discoloration and no […]