PVC (PVC) chemical and physical properties of rigid PVC are one of the most widely used plastics. PVC material is a kind of non-crystalline material. PVC material is used in the actual use of stabilizers, lubricants, auxiliary processing agents, color materials, reinforcing agents and other additives.
The PVC material has non-flammability, high strength, resistance to climate change and excellent geometric stability. PVC has a strong resistance to oxidants, reductants and strong acids. However, it can be corroded by concentrated oxidizing acid such as concentrated sulfuric acid, concentrated nitric acid, and is not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons.
The melting temperature of PVC is a very important technological parameter in the process of processing. If this parameter is improper, it will cause the problem of material decomposition. The flow characteristics of PVC are quite poor and its process is very narrow. In particular, the large molecular weight of PVC material is more difficult to process (this material usually has to be lubricants to improve the flow characteristics), so it is usually used for small molecular weight of PVC material. The shrinkage rate of PVC is quite low, generally 0.2~ 0.6%.
Injection molding process conditions
Melting temperature: 185 ~ 205 ℃ mold temperature: 20 ~ 50 ℃
Injection pressure: can be large to 1500bar pressure pressure: can be large to 1000bar injection speed: to avoid material degradation, it is generally used to give a considerable injection speed.
Runner and gate: all regular sprue can be used. If you are working with smaller parts, it is better to use a needle gate or a submerged gate. For thicker parts, it is best to use a fan gate. The minimum diameter of needle-pointed gate or submerged gate should be 1mm; The thickness of the fan gate should not be less than 1mm.
Typical use of water supply pipeline, household pipe, housing wall board, commercial machine housing, electronic packaging, medical equipment, food packaging, etc.
What are the classification of PVC plastic bags? What are the advantages of Pvc plastic bags
High of the first kind is polyethylene plastic bags, the bags because the density is higher, so for some more for air tightness is higher products, such as used for packing food, tea and milk powder, etc., these items of gas tightness is higher, once appear mistake, can affect the quality of the products. The second type of low-pressure polyethylene plastic bags, because the plastic bags are treated with low pressure, so the quality is not very high, so it is widely used in garbage bags, shopping bags and so on. The third type is polypropylene plastic bags, which are widely used in clothing and knitwear because of the different materials, so that products are not damaged. The fourth category is the most highly rated polyvinyl plastic bag in the plastic, which USES the highest materials, so it is more suitable for making gift boxes, which are both practical and beautiful.
The advantages of Pvc plastic bags
As we all know, plastic bags have many advantages, so they are widely used, but all you know is that plastic bags are very light, but they can carry many things. The advantages of PVC plastic bag are introduced. First, the anti-corrosion ability of plastic bags is strong, and it will not react with acid base. Secondly, plastic bags are cheap, waterproof, low quality and durable. This is the reason why people like to use plastic bags most. The third plastic bag is a good insulator, so it is not easy to have an accident. The design of the water solubility of the fourth PVC plastic bag is completely soluble in water and is not toxic and harmless. The fifth PVC plastic bag is malleable and not easy to deform.