Bag making machine is a machine for making all kinds of plastic bags or other material bags. Its processing range is all kinds of plastic or other material bags with different sizes, thicknesses and specifications. Generally speaking, plastic bags are the main products.
Plastic bag making machine
1. Classification and application of plastic bags
1. Types of plastic bags
(1) High pressure polyethylene plastic bag
(2) Low pressure polyethylene plastic bag
(3) Polypropylene plastic bag
(4) PVC plastic bag
2. Use of plastic bags
(1) Purpose of high pressure polyethylene plastic bag:
A. Food packaging: cakes, candy, fried goods, biscuits, milk powder, salt, tea, etc;
B. Fiber packaging: shirts, clothing, needle cotton products, chemical fiber products;
C. Packaging of daily chemical products.
(2) Purpose of low pressure polyethylene plastic bag:
A. Garbage bag and strain bag;
B. Convenience bag, shopping bag, handbag, vest bag;
C. Fresh keeping bag;
D. Woven bag inner bag
(3) Application of polypropylene plastic bag: mainly used for packaging textiles, needle cotton products, clothing, shirts, etc.
(4) Uses of PVC plastic bags: A. gift bags; B. Luggage bags, needle cotton products packaging bags, cosmetics packaging bags;
C. (zipper) document bag and data bag.
2.Composition of plastics
The plastic we usually use is not a pure substance. It is made of many materials. Among them, high molecular polymer (or synthetic resin) is the main component of plastics. In addition, in order to improve the performance of plastics, it is necessary to add various auxiliary materials, such as fillers, plasticizers, lubricants, stabilizers and colorants, so as to become plastics with good performance.
1. Synthetic resin
Synthetic resin is the main component of plastics, and its content in plastics is generally 40% ~ 100%. Because of its high content and the nature of resin often determines the nature of plastics, people often regard resin as a synonym for plastics. For example, PVC resin and PVC plastic, phenolic resin and phenolic plastic are confused. In fact, resin and plastic are two different concepts. Resin is an unprocessed original polymer. It is not only used to make plastics, but also used as raw material for coatings, adhesives and synthetic fibers. In addition to a small part of plastics containing 100% resin, the vast majority of plastics need to add other substances in addition to the main component resin.
Fillers, also known as fillers, can improve the strength and heat resistance of plastics and reduce costs. For example, the addition of wood powder to phenolic resin can greatly reduce the cost, make phenolic plastic one of the cheapest plastics, and significantly improve the mechanical strength. Fillers can be divided into organic fillers and inorganic fillers, the former such as wood powder, rags, paper and various fabric fibers, and the latter such as glass fiber, diatomite, asbestos, carbon black, etc.
Plasticizers can increase the plasticity and softness of plastics, reduce brittleness and make plastics easy to process and shape. Plasticizers are generally high boiling organic compounds that are miscible with resin, non-toxic, odorless and stable to light and heat. Phthalates are the most commonly used. For example, in the production of PVC plastics, if more plasticizers are added, soft PVC plastics can be obtained. If no or less plasticizers are added (dosage < 10%), rigid PVC plastics can be obtained.
In order to prevent the synthetic resin from being decomposed and damaged by light and heat in the process of processing and use, and prolong the service life, a stabilizer should be added to the plastic. Commonly used are stearate, epoxy resin, etc.
Colorants can make plastics have various bright and beautiful colors. Organic dyes and inorganic pigments are commonly used as colorants.
The function of lubricant is to prevent the plastic from sticking to the metal mold during molding, and make the plastic surface smooth and beautiful. Common lubricants include stearic acid and its calcium magnesium salts.
In addition to the above additives, flame retardants, foaming agents and antistatic agents can also be added to plastics to meet different application requirements.
Garment bag making machine
Garment bag refers to a bag made of OPP film or PE, PP and CPP film, with no adhesive film at the inlet and sealed on both sides.
We are generally widely used for packaging summer clothes, such as shirts, skirts, trousers, buns, towels, bread and jewelry bags. Usually, this kind of bag has self-adhesive on it, which can be sealed directly after being loaded into the product. In the domestic market, this kind of bag is very popular and widely applicable. Because of its good transparency, it is also an ideal choice for packaging gifts.
Post time: Aug-10-2021