Case

Plastic box packaging main material difference?

Release time:

2017-09-20

PVC plastic box

A: PP (Polypropylene) that is polypropylene, is the development of nylon after another excellent resin varieties, it is a high density, no side chain, high crystalline linear polymer, with excellent comprehensive properties. White translucent, waxy when uncolored; lighter than polyethylene. Transparency is also better than polyethylene, rigid than polyethylene.
Material Performance
Density is small, strength stiffness, hardness and heat resistance are better than low pressure polyethylene, can be used at about 100 degrees. It has good electrical properties and high-frequency insulation, which is not affected by humidity, but becomes brittle at low temperature and is not resistant to aging. It is suitable for making general mechanical parts, corrosion-resistant parts and insulation parts.
Forming performance
1. Crystalline material, moisture absorption is small, prone to melt rupture, long-term contact with hot metal easy to decompose.
2. The fluidity is good, but the shrinkage range and shrinkage value are large, and shrinkage is easy to occur. Dents, deformations.
3. The cooling speed is fast, the gating system and the cooling system should slowly dissipate heat, and pay attention to control the molding temperature. The material temperature is low and the direction is obvious. Especially at low temperature and high pressure, when the mold temperature is lower than 50 degrees, the plastic parts are not smooth, easy to produce poor welding, leaving marks, and easy to warp and deform above 90 degrees.
4. plastic wall thickness should be uniform, to avoid the lack of glue, sharp corners, to prevent stress concentration.
Two: PVC (Polyvinyl chloride) that is polyvinyl chloride. PVC is one of the most widely used plastic materials. PVC material is a non-crystalline material. PVC material in the actual use of often add stabilizers, lubricants, auxiliary processing agents, colorants, anti-impact agents and other additives.
PVC material is non-flammable, high strength, resistance to climate change and excellent geometric stability. PVC has strong resistance to oxidizing agents, reducing agents and strong acids. However, it can be corroded by concentrated oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid and is not suitable for contact with aromatic hydrocarbons and chlorinated hydrocarbons.
PET (Polyethylene Terephthalate) is polyethylene terephthalate. Is a common resin in life, PET can be divided into APET,RPET,PETG.
The molecular structure of PET is highly symmetrical and has a certain crystalline orientation ability, so it has high film-forming properties and properties. PET has good optical properties and weather resistance, and amorphous PET has good optical transparency. In addition, PET has excellent wear resistance, friction resistance, dimensional stability and electrical insulation. PET bottles made of high strength, good transparency, non-toxic, impermeable, light quality, high production efficiency and so on have been widely used. PBT and PET molecular chain structure is similar, most of the properties are the same, but the molecular main chain from two methylene into four, so the molecule is more flexible, more excellent processing performance.

Previous

What is PVC material? PVC material detailed introduction

None

Next

Previous

What is PVC material? PVC material detailed introduction

Next

None