What problems should be paid attention to in the use of plastic woven bags ? Plastic woven bag factory
In general, plastic woven bags are generally used for packaging of industrial products, not for packaging of food products. If there are, they are generally used for outer packaging of products, not inner packaging, so we When using plastic woven bags, some problems need our special attention.
In the tableware market, plastic woven bags are generally used as outer packaging. Many plastic products have the advantages of light weight and non-fragility. The outer packaging of these products is not easy to use woven bags and other items. So many people have doubts about the toxicity of the components of woven bags. In fact, otherwise, if the woven bags are used as food packaging, they are generally made of plastics within the qualified range of food, rather than industrial woven bag materials;
Generally speaking, plastic woven bag products on the market should be safe and reliable if they strictly use food-grade raw materials. In addition, when using plastic woven bag products for food, controlling its temperature is also critical. Generally, plastic products have a temperature resistance range, which averages around 110 degrees Celsius. Of course, each product is different. So when using woven bags, try to avoid using at high temperature;
In the above aspects, we have analyzed some safety methods of plastic woven bags from the perspective of food safety. We also ask the users to pay attention to avoid unnecessary loss and trouble.
Types of plastic woven bags
Foreign production is mainly polyethylene (PE), domestic production is mainly polypropylene (PP), which is a thermoplastic resin made by the polymerization of ethylene. Industrially, copolymers of ethylene and a small amount of α-olefins are also included. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (minimum use temperature can reach -70 ～ -100 ℃), good chemical stability, can withstand most acid and alkali erosion (not resistant to oxidizing properties) Acid), insoluble in ordinary solvents at room temperature, low water absorption, and excellent electrical insulation properties; but polyethylene is very sensitive to environmental stress (chemical and mechanical effects), and has poor heat aging resistance. The properties of polyethylene vary from species to species, mainly depending on the molecular structure and density. Products with different densities (0.91 to 0.96 g / cm3) can be obtained by using different production methods. Polyethylene can be processed by common thermoplastic molding methods (see Plastic Processing). It has a wide range of uses, mainly used to manufacture films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials such as televisions and radars. With the development of petrochemical industry, the production of polyethylene has developed rapidly, and the output accounts for about 1/4 of the total plastic output. In 1983, the total polyethylene production capacity in the world was 24.65Mt, and the capacity of devices under construction was 3.16Mt. Plastic woven bag factory
A thermoplastic resin made by the polymerization of propylene. There are three configurations of isotactic, irregular and syndiotactic substances. Industrial products are based on isotactic substances. Polypropylene also includes copolymers of propylene and a small amount of ethylene. Usually a translucent colorless solid, odorless and non-toxic. Because the structure is regular and highly crystallized, the melting point is as high as 167 ° C, and it is heat resistant. The product can be sterilized by steam. With a density of 0.90g / cm3, it is the lightest general-purpose plastic. Corrosion resistance, tensile strength 30MPa, strength, rigidity and transparency are better than polyethylene. Disadvantages are poor low temperature impact resistance and easier ageing, but they can be overcome by modifying and adding antioxidants, respectively.
The color of the woven bag is generally white or off-white, non-toxic and tasteless, and generally less harmful to the human body. Although it is made of various chemical plastics, it is more environmentally friendly and has a stronger recycling strength;
Woven bags have a wide range of uses, mainly for the packaging and packaging of various items, and are widely used in industry;
The plastic woven bag is made of polypropylene resin as the main raw material.
The composite plastic woven bag is made of plastic woven cloth as a base material and is compounded by a casting method.
This series of products are used to package powdery or granular solid materials and flexible items. Composite plastic woven bags are divided into two-in-one bags and three-in-one bags according to the main material composition.
According to the sewing method, it can be divided into bottom-stitched bags, bottom-stitched bottom bags, insert pockets and adhesive sewing bags.
According to the effective width of the bag, it is divided into 350, 450, 500, 550, 600, 650, 700mm, and special specifications are negotiated between the supply and demand sides. Plastic woven bag factory