Raw material regulations for injection molding process- Dunhai Mould Factory

The injection molding process is a common plastic granulation method and a rapidly developing plastic molding method. The process relies on standard air pressure to inflate the hot melt parison in the mold into a hollow product. The mold shell used for injection molding only has a male mold (cavity). Compared with injection molding, injection molding has the characteristics of lower engineering cost of machinery and equipment, strong adaptability, and good moldability. It can be made with complicated fluctuation curves. commodity.

1. Raw material regulations for injection molding process
If the melt index value of the hollow injection molding raw material is 0.04 ~ 1.12, then it belongs to high-quality raw materials. Common raw materials include high-pressure polyethylene, polyethylene, acrylic resin, cellulose ester and polyacetal resin, etc., among which high-pressure Polyethylene is the most used.

2. Types of injection molding processing technology
There are four types of injection molding processes, namely injection injection molding, extrusion injection molding, stretch injection molding, and injection plastic film method.
Injection injection molding Injection injection molding is key to the production and processing of parisons supported by metal cores. Its advantages are as follows: it is not easy to cause waste during the production process; it can manipulate the thickness of products and the dispersion of raw materials; commodity molding High precision, smooth surface; small batch production can be carried out.
The defect of injection molding depends on the increase in the cost of molding machinery and equipment, and it is uncomfortable for injection molded products with large body shapes.

Extrusion injection molding Extrusion injection molding is to first use the extrusion method to first make the plastic into a bottomed parison, and then move the parison to the injection mold to make a hollow product. The key is to use the parison that is not supported. Production and processing.

The advantages of extrusion injection are as follows: high production efficiency; low-cost machinery and equipment; wide selection of mold shells and mechanical equipment. The disadvantages are the high rate of unqualified; poor purchase and utilization of waste; restrictions on the thickness control of products and the dispersion of raw materials; the actual pressing operation must be carried out after molding.

Lashen injection molding Lashen injection molding has two production and processing methods, one is extrusion-pulsing-injection, the other is injection-pulsing-injection, which can produce and process products with two-axis trends, which can greatly reduce Product cost, improve product characteristics. The products made by this molding method have the characteristics of high definition, strong impact resistance, strong surface layer and good rigidity. Injection plastic film method Injection plastic film method uses extrusion method to first knead the plastic into a tube, and then blow air into the tube to make it continue to expand to a certain specification, and after the tube is cooled, it is stretched and rewinding into two layers. Flat film. The injection plastic film method is very common, and it is commonly used to make plastic films such as high-pressure polyethylene, polyethylene, and acrylic resin.

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