مادة مقاومة عالية ومنخفضة درجة الحرارة PP لفة بلاستيكية للتشكيل الحراري من الأطعمة المجمدة

Description of High and low temperature resistance material PP plastic roll for thermoforming trays of frozen food

Polypropylene, a kind of plastic, is a linear polymer with high density, no side chains, and high crystallinity. It has excellent comprehensive properties. Common products: basins, barrels, furniture, films, woven bags, bottle caps, car bumpers, etc.
pp plastic, chemical name: polypropylene English name: Polypropylene (abbreviated as pp) Specific gravity: 0.9-0.91 g/cm3 Molding shrinkage: 1.0-2.5% Molding temperature: 160-220℃ PP is a crystalline polymer, PP is Comprehensive performance is better than PE material. PP products have light weight, good toughness, and good chemical resistance. Disadvantages of PP: low dimensional accuracy, insufficient rigidity, poor weather resistance, it has post-shrinkage phenomenon, after demolding, it is easy to age, become brittle and easy to deform. In daily life, the commonly used fresh-keeping box is made of PP material.

PP polyester is a kind of amorphous, its melting point should be above 220, and its heat distortion temperature should be about 121 degrees, but since it is a macromolecular polymer after all, the higher the temperature, the more likely it is that small analytical oligomers will precipitate Most of these substances are not good for human health, and according to the customer’s use, the general boiling water is 100 degrees, so the general plastic cups will not be labeled with more than 100 degrees.
 

If you want to know whether pp material is poisonous, let’s first have an accurate understanding of the nature of pp material. The so-called pp material is what we usually call polypropylene in our daily life. It is a white translucent without side Chain, high-density linear polymer, has good oil resistance and weak acid and alkali resistance, and has good overall performance. It is often used in the production of household items, barrels, basins, bottle caps and so on.
In the pp material, high-purity propylene is used as the main material, which contains a small amount of ethylene copolymer, which is dried, mixed, extruded, granulated, sieved and homogenized into polypropylene particles. The particles are cylindrical, the particles are very smooth, without any mechanical impurities, it has good mechanical properties and heat resistance, and it is non-toxic when used in the temperature range of minus 30 degrees Celsius to 140 degrees Celsius.

The PP microwave meal box is the only plastic box that can be put in the microwave oven and can be reused after careful cleaning. Special attention should be paid to some microwave lunch boxes. The box body is indeed made of No. 5 PP, but the lid is made of No. 1 PE. Because PE cannot withstand high temperatures, it cannot be placed in the microwave together with the box. To be safe, remove the lid before placing the container in the microwave.