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Polycarbonate molding processing
by：CSSSLD
2021-01-23
POM POM and acetal copolymer divides into two kinds, the former is formaldehyde or melamine formaldehyde homopolymerization body, the latter is melamine formaldehyde and small amounts of copolymerization monomer of the copolymer.
Although both the crystallinity of pom, density, mechanical strength is higher, but the thermal stability than acetal copolymer, and acetal copolymer synthesis process is simple, easy to shape, so, the injection molding processing factory production is given priority to with acetal copolymer.
Polymerization methods have solution polymerization and bulk polymerization.
PC is sensitive to gap, thus products should reduce as far as possible in the design of Angle, the area of gap and the thickness of the mutation, lest produce stress concentration caused by products. When the PC melt cooling contraction even, molding shrinkage of small, usually in 0. 4% - 0. The range of 8%. With proper control of melt temperature, mold temperature, injection pressure and pressure maintaining process conditions such as time, the products of the high dimensional accuracy can be obtained.
PC can use injection molding, extrusion, blow molding, thermoforming and stretch film can meet the processing method, the different USES of all kinds of products, widely used in the optics, electronics electrical, automotive industry, construction and other aspects. Polyformaldehyde word century s industrialized production, due to the excellent comprehensive mechanical properties, good dimensional stability and molding processability, obtained the rapid development, has now become an important variety of engineering plastics, in engineering plastics production after PA and was third in the PC.
if the need to further improve dimensional stability of the product, can be in products - 110 Heat treatment under 135 ℃. Heat treatment can reduce internal stress generated in PC processing, to improve the tensile strength, bending strength, hardness and heat deformation temperature, etc. PC products for heat treatment is to improve its dimensional stability and resistance to environmental stress cracking of commonly used methods. But note that after heat treatment is often results in the decrease of impact strength due to increased crystallization.
industrial PC both pure resin, modified varieties, different specifications and types can meet different use. In be used actually can according to the molding methods and types of products to choose different types or different average molecular weight of the PC. Injection molding generally choose average molecular weight is 20000 - 40000 PCS; Extrusion can be used for high relative molecular mass of PC, usually in the 30000 - More than 40000, relative molecular mass increase not only is advantageous to the extrusion molding, but also to improve mechanical properties of the product, especially the environmental stress cracking resistance.
PC macromolecular chain rigidity, its high melt viscosity and flow characteristics near Newtonian fluid, the melt viscosity is influenced by shear rate is lesser, sensitive to temperature changes. Therefore, processing is commonly used in the temperature to adjust the liquidity of the melt, and requires high molding pressure. In addition, should raise the mold temperature in the injection molding, the production of products to reduce internal stress, according to the thickness of the products size, mold temperature control in the 80 - 120℃。
because of the PC melt viscosity, liquidity is poor, the residual stress in the processing of injection molding parts is big, easy to produce internal stress cracking. Thus developed a series of PC alloy, PC/ABS alloy was the earliest and most widely used. These alloy greatly improve the liquidity of the material, improve the processing performance. In addition, also can use fiber reinforced to further improve the mechanical properties of PC. The modified varieties could be selected according to actual needs.
more excellent articles: polycarbonate, click directly.
http://www。 csssld。 cn//html/2017/Info_1018/702。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
PC is sensitive to gap, thus products should reduce as far as possible in the design of Angle, the area of gap and the thickness of the mutation, lest produce stress concentration caused by products. When the PC melt cooling contraction even, molding shrinkage of small, usually in 0. 4% - 0. The range of 8%. With proper control of melt temperature, mold temperature, injection pressure and pressure maintaining process conditions such as time, the products of the high dimensional accuracy can be obtained.
PC can use injection molding, extrusion, blow molding, thermoforming and stretch film can meet the processing method, the different USES of all kinds of products, widely used in the optics, electronics electrical, automotive industry, construction and other aspects. Polyformaldehyde word century s industrialized production, due to the excellent comprehensive mechanical properties, good dimensional stability and molding processability, obtained the rapid development, has now become an important variety of engineering plastics, in engineering plastics production after PA and was third in the PC.
if the need to further improve dimensional stability of the product, can be in products - 110 Heat treatment under 135 ℃. Heat treatment can reduce internal stress generated in PC processing, to improve the tensile strength, bending strength, hardness and heat deformation temperature, etc. PC products for heat treatment is to improve its dimensional stability and resistance to environmental stress cracking of commonly used methods. But note that after heat treatment is often results in the decrease of impact strength due to increased crystallization.
industrial PC both pure resin, modified varieties, different specifications and types can meet different use. In be used actually can according to the molding methods and types of products to choose different types or different average molecular weight of the PC. Injection molding generally choose average molecular weight is 20000 - 40000 PCS; Extrusion can be used for high relative molecular mass of PC, usually in the 30000 - More than 40000, relative molecular mass increase not only is advantageous to the extrusion molding, but also to improve mechanical properties of the product, especially the environmental stress cracking resistance.
PC macromolecular chain rigidity, its high melt viscosity and flow characteristics near Newtonian fluid, the melt viscosity is influenced by shear rate is lesser, sensitive to temperature changes. Therefore, processing is commonly used in the temperature to adjust the liquidity of the melt, and requires high molding pressure. In addition, should raise the mold temperature in the injection molding, the production of products to reduce internal stress, according to the thickness of the products size, mold temperature control in the 80 - 120℃。
because of the PC melt viscosity, liquidity is poor, the residual stress in the processing of injection molding parts is big, easy to produce internal stress cracking. Thus developed a series of PC alloy, PC/ABS alloy was the earliest and most widely used. These alloy greatly improve the liquidity of the material, improve the processing performance. In addition, also can use fiber reinforced to further improve the mechanical properties of PC. The modified varieties could be selected according to actual needs.
more excellent articles: polycarbonate, click directly.
http://www。 csssld。 cn//html/2017/Info_1018/702。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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