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Company Name: Yuyao Longguan Extrusion Factory
Company Address: Yuyao Town, Yuyao City, Zhejiang Province, the town of Huitou Village, No. 92
Contact: Manager Li
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Introduction and shortcomings of extrusion processing
Edit:Yuyao Longguo Extrusion Factory   UpDate:2017-04-14

Extrusion processing It is a plastic molding process, is one of the important methods of forming thermoplastic plastic.

Extrusion processing is defined as the plastic raw material is heated, so that it was viscous state, under the action of pressure, through the extrusion die and cross-section and die shape similar to the continuum, and then frozen stereotypes for the glass, Cut to get a certain geometric shape and size of the plastic products. For example, in the extruder to heat the material, pressure, so that the melt flow state, and then from the die to its continuous extrusion and molding, is called extrusion. This method can be made tube, tube, rod, film, film, profile, wire and so on.

In addition to extrusion, the common plastic molding process is injection molding, molding, blow molding, rotomolding, casting, dipping plastic, according to different materials and products can be specific to the specific use of different plastic molding Technology.

Extrusion blow molding.

Extrusion Blow Molding is a method of making hollow thermoplastic parts. Well known blowers are bottles, barrels, cans, boxes and all containers of packaged food, beverages, cosmetics, medicines and daily necessities. Large blown containers are usually used for packaging of chemical products, lubricants and bulk materials. Other blow molded products are ball, bellows and toys. For the automobile manufacturing industry, fuel tank, car shock absorber, seat back, center bracket and armrest and headrest cover are blow molding. For the machinery and furniture manufacturing industry, blow molding parts are housings, door frames, racks, pots or boxes to have an open face.


The most common blown extruded material is high density polyethylene, and most of the milk bottles are made from this polymer. Other polyolefins are often processed by blow molding. Depending on the application, styrene polymers, polyvinyl chloride, polyester, polyurethane, polycarbonate and other thermoplastics can also be used for blow molding. Recently engineering plastics are widely accepted in the automotive industry. Material selection is based on mechanical strength, weatherability, electrical properties, optical properties and other properties. 3/4 blow molded articles are manufactured by extrusion blow molding. The extrusion process is forced to produce the product through a hole or die. The extrusion blow molding process consists of five steps: 1. Plastic mold (hollow plastic tube extrusion); 2. In the embryo will be closed on the mold, clamping mold and cut off the embryo; 3. To the cavity of the Cold wall inflation type, adjust the opening and maintain a certain pressure during cooling, open the mold, write down the blown parts; 5. trim the flash to get the finished product.

Defects in extrusion process

1, plastic scorch

2, extruded plastic poor

3 4, squeeze the size of unqualified

5, longitudinal bag with bond strength failed

6, squeeze the appearance of the bag Unqualified

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