Author - china plastic injection molding

Causes and solutions of sprue sticking in injection molding

Causes and solutions of sprue sticking during injection molding:
(1) The cooling time is too short and the sprue has not yet solidified.
(2) If the gradient of the sprue is not enough, the demoulding gradient should be increased.
(3) The improper fit size between the sprue bushing and the nozzle results in leakage.
(4) The main channel is rough and there is no cooling well in the main channel.
(5) If the temperature of nozzle is too low, the temperature should be increased.
 
 
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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”. […]

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 […]

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 […]

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 […]

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 […]

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 […]

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 […]

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 […]

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. […]