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Plastic packaging bags

Plastic packaging bags is a kind of packaging bags that uses plastic as raw material and is used in the production of various products in life. It is widely used in daily life and industrial production, but the convenience at this time brings long-term harm. Commonly used plastic packaging bags are mostly made of polyethylene film, which is non-toxic, so it can be used to contain food. There is also a film made of polyvinyl chloride, which itself is non-toxic, but the additives added according to the use of the film are often harmful substances and have certain toxicity. Therefore, such films and plastic bags made of the films are not suitable for containing food.

Plastic packaging bags Description

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Why are plastic packaging bags widely used and their advantages

Plastic packaging bags are also an important way to transmit information. Important information on the packaging bags, such as production date, usage, precautions, etc., can be seen at a glance; the use of plastic packaging bags greatly saves the space used, and small items are placed It can save the volume in the packaging bag; it can also keep the items clean and safe. For example, the fruit can be kept fresh in the plastic packaging bags, and it can also play a protective role in the process of transportation.

Plastic packaging bags can bring convenience to our lives, but also bring pollution to our living environment. We recycle them according to the characteristics of plastic packaging bags, which protect the environment to a certain extent. Plastic packaging bags It can be converted into new energy by incineration for other production; plastic packaging bags can also be classified and recycled, and plastic packaging bags of different materials can be classified and processed; it can also be used to synthesize chemical raw materials to produce synthetic chemical products

Plastic packaging bags

1.Plastic packaging bags material

Plastic packaging bags can be divided into OPP, CPP, PP, PE, PVA, EVA, composite bags, co-extrusion bags, etc. Non-toxic, compoundable, better transparency than PE, slightly worse hardness

2.A plastic bag is a container made of plastic film. About five kinds of plastic are made into plastic packaging bags

1. Polyvinyl chloride (PVC)

In the 1950s and 1960s, most plastic packaging bags in China were made of PVC. Because they contain additives to improve processability and plasticizers to improve film flexibility, these additives are toxic and unsuitable for food preservation. Therefore, apart from special non-toxic hard films for packaging, there are few other films on the market

2. Low pressure polyethylene (HDPE) HDPE film

It is typically used where high tension and impermeability are required. HDPE films are also commonly used in commercial bags, grocery bags and food packaging. In daily life, shopping bags with high strength, good waterproof performance and good impermeability are made of this material

3. High pressure polyethylene (LDPE) LDPE

The prepared films have good optical properties, strength, flexibility, sealing properties, slow odor diffusion and chemical stability. Most of the plastic packaging bags in use today are of this type due to their excellent properties and processability, as well as being non-toxic and relatively low price.

4. Polypropylene (BOPP) BOPP film

It is the abbreviation of biaxially oriented polypropylene, which is a very important flexible packaging material, colorless, odorless, non-toxic, with high tensile strength, impact strength, rigidity, strength and toughness and good transparency. After corona treatment, BOPP film has good printing adaptability and can be used for color printing to obtain good appearance, so it is often used as the surface material of composite film. Currently, BOPP is used as a packaging film for colored food and cold drinks.

5. Other plastic films: polyester, polystyrene and composite films, etc.

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What are the raw materials for the production process of plastic packaging bags?

The plastic packaging bags we usually use is not a pure substance, it is formulated from many materials. Among them, high molecular polymers (or synthetic resins) are the main components of plastics. In addition, in order to improve the performance of plastics, various auxiliary materials, such as fillers, plasticizers, lubricants, stabilizers, etc., are added to the polymer. Colorants, etc., can become plastic packaging bags with good performance.

【Synthetic resin】

Synthetic resin is the most important component of plastic, and its content in plastic is generally 40% to 100%. Due to the large content and the properties of resins that often determine the properties of plastics, people often regard resins as synonymous with plastics. For example, polyvinyl chloride resin is confused with polyvinyl chloride plastic, phenolic resin and phenolic plastic. In fact, resin and plastic are two different concepts. Resin is a raw, unprocessed polymer that is used not only to make plastics, but also as a raw material for coatings, adhesives, and synthetic fibers. In addition to a very small part of plastics containing 100% resin, the vast majority of plastics need to add other substances in addition to the main component resin.

 【filler】

Fillers, also known as fillers, can improve the strength and heat resistance of plastics and reduce costs. For example, adding wood powder to phenolic resin can greatly reduce the cost, making phenolic plastic one of the cheapest plastics, and at the same time, it can significantly improve the mechanical strength. Fillers can be divided into organic fillers and inorganic fillers, the former such as wood flour, rags, paper and various fabric fibers, etc., the latter such as glass fiber, diatomaceous earth, asbestos, carbon black and so on.

 【Plasticizer】

Plasticizers can increase the plasticity and softness of plastics, reduce brittleness, and make plastics easy to process and shape. Plasticizers are generally resin-miscible, non-toxic, odorless, high-boiling organic compounds that are stable to light and heat. The most commonly used are phthalates. For example, when producing polyvinyl chloride plastics, if more plasticizers are added, soft polyvinyl chloride plastics can be obtained. .

  【stabilizer】

In order to prevent the synthetic resin from being decomposed and destroyed by light and heat during processing and use, and prolong the service life, a stabilizer should be added to the plastic. Commonly used are stearate, epoxy resin and so on.

  【Colorant】

Colorants can make plastics have a variety of bright and beautiful colors. Organic dyes and inorganic pigments are commonly used as colorants.

 【Lubricant】

The function of the lubricant is to prevent the plastic from sticking to the metal mold during molding, and at the same time to make the surface of the plastic smooth and beautiful. Commonly used lubricants are stearic acid and its calcium and magnesium salts.

In addition to the above auxiliaries, flame retardants, foaming agents, antistatic agents, etc. can also be added to the plastic to meet different application requirements.