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What material is the plastic bag made of?

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is a bag made of polypropylene, polyester and nylon

plastic bag is a bag made of plastic (commonly used plastics include polypropylene, polyester, nylon, etc.) as the main raw material. It is an essential item in people’s daily life and is often used to hold other items. It is widely used because of its advantages of low cost, extremely light weight, large capacity and easy storage. However, due to the disadvantages of extremely long degradation cycle and difficult treatment, plastic bags are prohibited from production and use in some countries

from June 1, 2008, China implements the plastic restriction order: “the paid use system of plastic shopping bags shall be implemented in all supermarkets, shopping malls, market fairs and other commodity retail places. Plastic shopping bags shall not be provided free of charge, and the production, sale and use of plastic shopping bags with a thickness of less than 0.025mm are prohibited throughout the country “

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1. The harm of plastic bags:

1. If plastic bags are wrapped around people’s head, they may be unable to breathe and cause suffocation.

2. Waste plastic products are continuously accumulated in the soil, which will affect the absorption of nutrients and moisture by crops and reduce crop production.

3. Plastic bags themselves will release harmful gases, especially when cooked Food, packaged in plastic bags, often deteriorates, and the impact of deteriorated food on children’s health and development is particularly prominent

II. Application of plastic bags:

plastic bags are light, easy to shape, and have a wide range of applications. They can be soft, hard, wet, dry, sealed, breathable, one-time use and long-term use

since its inception, plastics have been studied to replace metals, wood or glass to reduce weight, facilitate use, storage, transportation or reduce fuel consumption. Plastic bags can also be used to protect goods, preserve food, carry liquid and wrap air. Most of the goods in the supermarket are all plastic packaging

reference source: Baidu Encyclopedia – plastic bags

PE — Polyethylene
polyethylene (, PE), abbreviated as PE. It is a high molecular organic compound formed by the addition and polymerization of ethylene. Polyethylene is recognized as the best material in contact with food in the world. It is non-toxic, tasteless and odorless, and meets the hygienic standard of food packaging. Polyethylene film, light and transparent, with moisture-proof, oxygen resistance, acid and alkali resistance, general air tightness, excellent heat sealing and other properties. It is known as “plastic flower”. It is the most used and important material for plastic packaging and printing

PVC — Polyvinyl Chloride
polyvinyl chloride is abbreviated as PVC. Its molecular formula is (CH-CH) n. It is the most important type of vinyl polymers and the second largest plastic variety in the world after polyethylene. The output in China ranks first among plastics. In the printing industry, PVC color calendered film and transparent glazing film are often used to make the packaging and decoration of book, folder, ticket and other covers

— shrinkable film
shrinkable film () is a thermoplastic film that is stretched and oriented in the production process and shrinks when exposed to hot air treatment or infrared radiation in the use process. After heat treatment, the film is tightly wrapped on the package, the shrinkage reaches the maximum in the cooling stage, and can be preserved for a long time

LDPE — low density polyethylene
low density polyethylene, referred to as LDPE, is the most used variety in the plastic packaging and printing industry in various countries. The specific gravity is 0.92 ~ 0.93 and can float in water. The crystallinity is low (60%), and bulk polymerization is carried out under the pressure of 1000 ~ 3000kg /C ㎡, so it is also called high-pressure polyethylene. At 23 ℃, the density is about 0.92. The calendering formability is poor, and it is suitable to be processed into tubular film by blow molding method. It is suitable for food packaging, fiber products packaging and daily chemical products packaging

HDPE — high density polyethylene
high density polyethylene, referred to as HDPE for short. The density is 0.941 ~ 0.965g/cm3. It is made of low-pressure polymerization, so it is also called low-pressure polyethylene. Milky white, indicating poor gloss. The film can be processed by blow molding and T-die extrusion process. Heat resistant, cooking resistant, cold resistant, freezing resistant, moisture-proof, gas proof, good insulation performance, not easy to damage, and the strength is twice that of LDPE. Easy to open. Strong paper imitation, known as “paper imitation plastic film”

BOPP – biaxially oriented polypropylene film
biaxially oriented polypropylene film, also known as biaxially oriented polypropylene film, with the English abbreviation code BOPP, is characterized by tensile molecular orientation, mechanical strength, folding strength, air tightness and moisture barrier better than ordinary plastic film. Compared with cellophane per unit area, the unit price is lower than cellophane. Because the film has excellent transparency and the reproduction color after printing is particularly bright and beautiful. It is an important substrate for plastic composite flexible packaging.

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Answer

 high temperature resistant materials include refractory and heat-resistant materials, including inorganic compounds and high molecular polymer materials. Refractory materials usually refer to inorganic materials that can withstand temperatures above 1580 ℃. They are building kilns, combustion chambers and other building materials that need to be resistant to high temperatures

 refractory materials generally refer to inorganic materials that can withstand temperatures above 1580 ℃. They are building kilns, combustion chambers and other building materials that need to be resistant to high temperatures. It is generally made of quartz sand, clay, magnesite, dolomite and other raw materials. Zhisheng, a high-temperature heat insulation coating, is a component inorganic coating with a temperature resistance range of - 80-1800 ℃ and a thermal conductivity of 0.03W /M.K. it can inhibit the thermal radiation and heat conduction of high-temperature objects and low-temperature objects, and can maintain 70% heat loss for high-temperature objects. Zhisheng coating can reduce the surface temperature of the object from 1100 ℃ to less than 100 ℃ by applying 8mm high temperature resistant, heat insulation and thermal insulation coating on the surface of the object at 1100 ℃. In addition, the high-temperature heat insulation coating has the characteristics of insulation, light weight, convenient construction and long service life. It can also be used as inorganic material, high-temperature and acid-base adhesive, and the attached objects are firm. Such as refractory cement, magnesia brick, etc. In a broad sense, inorganic refractory and heat-resistant materials refer to these compounds with high hardness, good brittleness and good chemical corrosion resistance, and the melting point is above 1500, such as high-temperature glass, which also belongs to refractory materials

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1 more

let’s not talk about the polymerization of plastic particles from petroleum olefins. It is mainly the “Ziegler Natta” catalyst, which produces the addition polymerization of olefins into polymers

PE (polyethylene) or PVC (polyvinyl chloride) plastic particles are heated and melted into viscous fluid, which enters the feeding hopper and is extruded through the narrow gap of the screw extruder. In order to prevent deformation, they should immediately enter the coolant (generally water) for cooling and forming, and roll them up into “plastic paper” with the pulled roller roll by roll

calendering is also used, but there is no “poly plastic”, because it is not a very thick plastic product and does not need a mold

break the large plastic paper into small pieces and seal one end with a thermal sealing machine to form a plastic belt.

plastic bags are made of healthy protective film according to standards, while the greenest and healthiest plastic bags are made of national grade a paper film. The qualified ones are made by grade C manufacturers. The most unqualified ones are the paper film plastic bags for packing meat in supermarkets. The ingredients are made of carbon ions and oxycarbonic acid, which are harmful to human body, while PVC is made of national grade

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