PP Polypropylene Chemical and Physical Properties PP is a semi-crystalline material. It is harder and has a higher melting point than PE. Since the homopolymer PP is brittle at temperatures above 0C, many commercial PP materials are random copolymers with 1 to 4% ethylene or clamp copolymers with higher ethylene content. Copolymer PP materials have a low heat distortion temperature (100C), low transparency, low gloss, and low rigidity, but have stronger impact strength. The strength of PP increases with the ethylene content. The Vicat softening temperature of PP is 150C. Due to the high degree of crystallinity, this material has very good surface stiffness and scratch resistance.
PP does not have the problem of environmental stress cracking. In general, PP is modified by adding glass fibers, metal additives, or thermoplastic rubber. The flow rate of PP has an MFR range of 1 to 40. PP materials with low MFR have better impact resistance but lower strength. For the same MFR material, the copolymer type has higher strength than the homopolymer type. Due to crystallization, PP shrinkage is quite high, typically 1.8 to 2.5%. And the uniformity of the shrinkage direction is much better than that of materials such as PE-HD. Adding 30% of the glass additive can reduce the shrinkage to 0.7%. Homopolymer and copolymer PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and resistance to dissolution. However, it is not resistant to aromatic hydrocarbons such as benzene solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, and the like.
Injection Molding Process Conditions
Drying: Drying is not required if stored properly.
Melting temperature: 220 ~ 275C, be careful not to exceed 275C. Mold temperature: 40~80C, 50C is recommended. The degree of crystallization is mainly determined by the mold temperature. Injection pressure: up to 1800 bar.
Injection speed: In general, using high-speed injection molding can minimize internal pressure. If there is a defect on the surface of the product, low speed injection at higher temperature should be used. Runners and Gates: For cold runners, typical runner diameters range from 4 to 7 mm. It is recommended to use round injection ports and runners. All types of gates can be used. Typical gate diameters range from 1 to 1.5 mm, but gates as small as 0.7 mm can also be used. For edge gates, the minimum gate depth should be half the wall thickness; the minimum gate width should be at least twice the wall thickness. PP material can use hot runner system completely.
Typical use
Automotive industry (mainly using PP with metal additives: fenders, ventilation ducts, fans, etc.), instruments (dishwasher door liners, dryer ventilation ducts, washing machine frames and covers, refrigerator door liners, etc.), Japan Use consumer products (lawn and garden equipment such as lawn mowers, sprinklers, etc.).
PP Polypropylene Chemical and Physical Properties PP is a semi-crystalline material. It is harder and has a higher melting point than PE. Since the homopolymer PP is brittle at temperatures above 0C, many commercial PP materials are random copolymers with 1 to 4% ethylene or clamp copolymers with higher ethylene content. Copolymer PP materials have a low heat distortion temperature (100C), low transparency, low gloss, and low rigidity, but have stronger impact strength. The strength of PP increases with the ethylene content. The Vicat softening temperature of PP is 150C. Due to the high degree of crystallinity, this material has very good surface stiffness and scratch resistance.
PP does not have the problem of environmental stress cracking. In general, PP is modified by adding glass fibers, metal additives, or thermoplastic rubber. The flow rate of PP has an MFR range of 1 to 40. PP materials with low MFR have better impact resistance but lower strength. For the same MFR material, the copolymer type has higher strength than the homopolymer type. Due to crystallization, PP shrinkage is quite high, typically 1.8 to 2.5%. And the uniformity of the shrinkage direction is much better than that of materials such as PE-HD. Adding 30% of the glass additive can reduce the shrinkage to 0.7%. Homopolymer and copolymer PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and resistance to dissolution. However, it is not resistant to aromatic hydrocarbons such as benzene solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, and the like.
Injection Molding Process Conditions
Drying: Drying is not required if stored properly.
Melting temperature: 220 ~ 275C, be careful not to exceed 275C. Mold temperature: 40~80C, 50C is recommended. The degree of crystallization is mainly determined by the mold temperature. Injection pressure: up to 1800 bar.
Injection speed: In general, using high-speed injection molding can minimize internal pressure. If there is a defect on the surface of the product, low speed injection at higher temperature should be used. Runners and Gates: For cold runners, typical runner diameters range from 4 to 7 mm. It is recommended to use round injection ports and runners. All types of gates can be used. Typical gate diameters range from 1 to 1.5 mm, but gates as small as 0.7 mm can also be used. For edge gates, the minimum gate depth should be half the wall thickness; the minimum gate width should be at least twice the wall thickness. PP material can use hot runner system completely.
Typical use
Automotive industry (mainly using PP with metal additives: fenders, ventilation ducts, fans, etc.), instruments (dishwasher door liners, dryer ventilation ducts, washing machine frames and covers, refrigerator door liners, etc.), Japan Use consumer products (lawn and garden equipment such as lawn mowers, sprinklers, etc.).
100% polyester Tricot Velvet
width 150cms 160cms 170cms
GSM 85gsm 120gsm 135gsm 160gsm 180gsm 200gsm 220gsm 240gsm 275gsm
Canton Fair in Guangzhou (May 1 to May 5,Oct 31 to Nov 4 every year)
China East China Import&Export Fair in Shanghai(Mar 1 to Mar 4,Sep 25 to Sep 27 every year)
Keqiao Textile Expo in Shaoxing(May 6 to May 8,Sep 28 to Sep 30 every year)
Heimexti Russia in Moscow(Feb 19 to Feb 22,Sep 17 to Sep 19 every year)
Heimtextil Frankfurt in Germany ( Jan 7 to Jan 10 every year)
Every year we are here to waiting for you.Textile business start from 1999.
Quality its soul of enterprise
Certificate:BRC , BSCI , COS , FAMI-QS , FSC , GB , GMP , GSV , HACCP , ISO/TS16949 , ISO10012 , ISO13485 , ISO14001 , ISO14004 , ISO14010 , ISO17025 , ISO17799 , ISO22000 , ISO9001 , ISO9002 , OHSAS18001 , OHSMS , SA8000 , TL9000 , ACS , API , ASME , AZO Free , CB , CCC , CE , CSA , EEV , EMC , ETL , FCC , FDA , GS , MSDS , NSF , Oeko-Tex Standard 100 , PSE , REACH , RoHS , S-Mark , SSA , Test Report , TUV , UL , VDE
Company Address:Changxing Light Textile Zone,Jiapu Town,Changxing County, Huzhou, Zhejiang, China
We are grey fabric factory.Printing and dyeing factory.Rolling and Packing factory.One-stop production from raw materials to finished products.Since 1999,we already start to produce and sale textile.The quality of our products has been certified by all international standard certificates,example OEKO-TEX.ANAB.IAF.EWC.AZO.SGS.CMA.ILAC-MRA.CNAS.ISO etc.Welcome to our factory to visit and negotiate.
Bleached Fabric
Superpoly and Tricot
Disperse Printed Fabric
Pigment Printed Fabric
Mattress Fabric
Super Poly
Golden Velvet,Poly Solid Velvet,Solid Tricot Fabric,Golden Goose Velvet
Zhejiang Qingsong Light Textile Co.,Ltd. , https://www.zjqstextile.com