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Material analysis of injection molded parts of battery buckle

 

1.Shape analysis of battery buckle

the structure of this plastic part is relatively simple and the appearance is smooth, but the demoulding involved in the groove of the product must be ejected twice, and there are four grooves on the plastic part. 

 

 The battery buckle material analysis
 battery buckle material is PE. Is a short name for polyethylene, a polymer formed by ethylene polymerization. When used as a plastic, its average relative molecular weight is more than 10,000. Depending on the polymer conditions, the actual average relative molecular weight can range from 10,000 to millions. Most of the PE ethylene monomers are obtained from petroleum cracking, which is the simplest molecular structure in the resin. it has rich raw material sources, low price, excellent electrical insulation and chemical stability, and is easy to be molded and processed. And there are many varieties, which can meet the different performance requirements, so it has developed rapidly since it came out. It is the largest resin variety at present and has a wide range of applications.

 

The properties of PE materials:
soft, poor mechanical properties, low surface hardness, good chemical stability, but not resistant to strong oxidant, good water resistance.

 

PE molding characteristics:
can not be preheated before molding, large shrinkage, easy deformation, long cooling time, The molding efficiency is not high, the plastic parts have shallow side concave can force demoulding.

Matters needing attention in die design of PE materials: pouring system should be filled as soon as possible, cooling system should be set up, and the operating temperature is generally less than 800 Celsius degree.
There are many kinds of PE materials. According to the requirements and characteristics of plastic parts, low density polyethylene can be selected as injection molding material.
There are many kinds of PE materials, in which low density polyethylene (LDPE) is used as injection molding material for plastic parts. (LDPE) is obtained by typical free radical polymerization process at high temperature and very high pressure. As early as the early 1940s, LDPE has been used for wire coating and is the earliest product in the PE family. LDPE combines many excellent properties, such as transparency, sealing, easy processing. It is one of the most widely used materials in polymer industry.

 LDPE can usually be prepared by tubular and kettle reactor. The pressure is (150 × 350) Mpa, polymerization temperature is between 150  and 260 , and appropriate amount of initiator is added.

 Different from the linear PE obtained by other processes, chain transfer is easy to occur in the process of high pressure free radical polymerization. There are a large number of branch chain structures in the obtained polymers, which make LDPE have specific properties such as transparency, flexibility, easy extrusion and so on. By controlling the average relative molecular weight (MW), crystallinity and relative molecular weight distribution (MWD), can be used as LDPE resin to obtain a variety of applications.

The average relative molecular weight of polymers is expressed by the average size of all the molecular chains that make up the polymer. For convenience, the melt flow rate (MFR) is used as a measure of the average relative molecular weight in the plastic industry. The unit of MFR is g / 10 min, and the value of MFR is inversely proportional to the average molecular weight.

The crystallinity of LDPE is related to the content of short branch chain in the resin, which is usually 30% ~ 40%. The increase of crystallization is due to the increase of rigidity, chemical resistance, barrier, tensile strength and heat resistance of LDPE. However, the impact strength, tear strength and stress cracking resistance are reduced.

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Address:No. 8, Rong Feng Road, Shang Sha third industrial zone, Changan Town, Dongguan, Guangdong, China

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