Author - china plastic injection molding

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. […]

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 […]

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 […]

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, […]