Production process of PVC foam
DATE：2021/8/18 8:29:18 / READ： / SOURCE：This station
Production process of PVC foam
1. The process flow of PVC production by molding method:
Recipe→kneading two-roll plastic refining pull sheet→cutting and weighing→foaming in the lamination mold
1. Molding method → heat treatment → PVC foam sheet. In the formula, the booster is mixed with foaming agent and stabilizer, grind 2～3 on a three-roll mill and then added to the kneader. The grinding formula is: DBP: foaming agent=0911; tribasic lead sulfate: DOP= 1:0.7. The molding foaming temperature is 160～165℃, time 30～45min, molding pressure is 5MPa, cooling temperature 50℃, time 20min, heat treatment is carried out in drying room, temperature 90～100℃, time 15～20min, and then placed at room temperature Around 7d
2 Note Union Law
Use the above-mentioned formula of soft low-foaming PVC foam plastic and produce according to the following production process: formula → kneading one and two rolls of plastic drawing → cooling and pelletizing → injection molding machine using 2.5-3kg/cm2 of steam during injection molding Heating, time 45～90min, Z type machine. The temperature of the injection machine is 170～175℃, the injection time is the same as 4～8s, the cooling time is 1～2.5min, the injection pressure is 25～40.7MPa, the mold temperature is 45～75, and the injection speed is 30～65mm/s.
Second, the performance of PVC foam
1. The performance of soft PVC foam
Density ≤6g/cm, tensile strength ≥2MPa, elongation at break ≥160%, Shore hardness 20-40, flexural strength 100,000 times
2. The performance of rigid PVC foam
Density≤4kg/m, line yield≤4%, water absorption≤.kg/m, tensile strength＞0.4MPa, elongation rate 10%, compressive strength ン18MPa, 8C2 non-proliferation, time-dependent -35c15mn Cracking, thermal conductivity (thermal conductivity) ≤ 0,043W/(m·℃), oil resistance, no change in normal gasoline immersion for 24b; acid resistance: 24h in 2HCL, no change in alkaline 45% NaOH, no change in immersion for 24h .
Developed and produced a new type of latex foam plastic material: latex, EVA, LDPE, PVC rubber-plastic blended foam material, using molded foaming technology for one-time molding, the key is to solve the meta-blend system
The compatibility of vulcanization can be carried out simultaneously, so as to obtain a good blended foamed homogeneous material. The advantages are large resilience, small compression deformation, excellent wear resistance, high tensile strength, and high performance, which are excellent Punch packaging materials.
Author：admin