Why are snakeskin bags called snakeskin bags?
In fact, woven bags are the formal name for snakeskin bags. The materials are PE, PP, etc., not made of snakeskin. The reason why it is called snakeskin bag is mainly because it looks like snakeskin, because each of its strands can be connected smoothly and the whole body is flat, as smooth and bright as snake skin, so it is named snakeskin bag, which is more convenient. The image is easy to understand, and people gradually got used to calling it snakeskin bag. Gradually, many people did not know that its original name was woven bag.
Woven bags, also known as snakeskin bags. It is a type of plastic bag used for packaging. Its raw materials are generally polyethylene, polypropylene and other chemical plastic raw materials. Braiding density refers to the number of warp and weft yarns in a 100mm×100mm braided fabric.
Woven bags are widely used, mainly used for packaging and packaging of various items, and are widely used in industry;
Plastic woven bags are made of polypropylene resin as the main raw material , extruded and stretched into flat yarn, and then weaved and made into bags.
Composite plastic woven bags are made of plastic woven cloth as the base material and compounded by casting method.
Used for packaging 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 is divided into seam bottom bags, seam bottom bags, insert bags and adhesive sewing bags.
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Woven bag?
Woven bag, also known as snakeskin bag. It is a type of plastic bag used for packaging. Its raw materials are generally polyethylene, polypropylene and other chemical plastic raw materials. Braiding density refers to the number of warp and weft yarns in a 100mm×100mm braided fabric.
Chinese name
Woven bag
Foreign name
woven bag
Alias
Snake skin bags
Materials
Polyethylene, polypropylene and other chemical plastic raw materials
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Type application scope
Introduction
Definition
The national standard GB/T8946-1998 stipulates, "Flat the bag, place two Circle two 100mm×100mm squares at two diagonal corners. The distance between the outer edge of the square and the edge of the bag is 100mm. Visually check the number of longitude and latitude roots of the square and take the average. When counting, when the final point is less than one, it will be counted as one. While the weaving density is specified in the standard, the density tolerance is also specified. The weaving density mainly depends on the packaging product and is decided by the user.
Raw materials
Explanation of plastic weaving terms: Woven bags are mainly made of polypropylene (English name pp) as the main raw material, which is extruded and stretched into flat Silk is then weaved, braided and made into bags.
Parameters
The commonly used woven fabric densities are 36×36 strands/10cm?, 40×40 strands/10cm?, and 48×48 strands/10cm?.
1. Braiding density tolerance.
The braid density tolerance refers to the number of flat yarns that are more or less than the given standard braid density.
2. The mass per unit area of woven fabric.
The weight per unit area of woven fabric is expressed in grams per square meter, which is an important technical indicator of woven fabric. The gram weight per square meter mainly depends on the warp and weft density and the thickness of the flat yarn. The gram weight per square meter affects the tensile strength and load capacity of the woven fabric. The gram weight per square meter is an important link for production enterprises to control costs.
3. Tensile load of woven fabric.
Tensile load is also called tensile strength, tensile strength. Woven cloth bears tensile loads in both warp and weft directions, so it is called warp and weft tensile loads.
4. Width.
The width of various woven fabrics directly affects the bag making process. For tube cloth, the warp width is expressed by warp warp, which is equal to half of the circumference of the circle.
Width shrinkage rate, the width of all woven fabrics after weaving and rolling. After unwinding, cutting, printing, and sewing, the width of the bag made will be slightly smaller than the width when rolling. We call it width. Wide retraction.
5. Feel.
PP flat knitted fabric feels thicker, wider, and rougher.
HDPE flat yarn braid feels soft, smooth and not dense.
Adding calcium masterbatch to PP flat wire material will make it feel wider. Adding less HDPE to PP will make it softer.
The flat yarn is narrow, the weaving is flat, and the hand feels soft. The flat yarn is wide, and there are many folded yarns when weaving the cloth, and the hand feels rough.
Type
The main raw material for foreign production is polyethylene (PE), and the main raw material for domestic production is polypropylene (PP), which is a thermoplastic resin obtained by polymerizing ethylene. In industry, it also includes polymers of ethylene and a small amount of α-olefins. Polyethylene is odorless, non-toxic, feels like wax, has excellent low-temperature resistance (the lowest operating temperature can reach -70~-100°C), has good chemical stability, and is resistant to most acids and alkalis (not resistant to oxidation) acid), insoluble in general solvents at room temperature, has low water absorption and excellent electrical insulation properties; however, 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 and mainly depend on molecular structure and density. Products with different densities (0.91~0.96g/cm3) can be obtained using different production methods. Polyethylene can be processed using general thermoplastic molding methods (see Plastic Processing). It has a wide range of uses, mainly used to make films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for televisions, radars, etc. With the development of petrochemical industry, polyethylene production has developed rapidly, accounting for about 1/4 of the total plastic production. In 1983, the world's total polyethylene production capacity was 24.65Mt, and the capacity of the equipment under construction was 3.16Mt.
Polypropylene (PP)
A thermoplastic resin made from the polymerization of propylene. There are three configurations: isotactic, atactic and syndiotactic. Industrial products have isotactic as the main component. Polypropylene also includes polymers of propylene and a small amount of ethylene. It is usually a translucent colorless solid, odorless and non-toxic. Due to its regular structure and high degree of crystallization, its melting point is as high as 167°C. It is heat-resistant and its outstanding advantages are that the product can be sterilized by steam. With a density of 0.90g/cm3, it is the lightest general-purpose plastic. Corrosion-resistant, tensile strength 30MPa, strength, rigidity and transparency are better than polyethylene. The disadvantage is that it has poor low-temperature impact resistance and is prone to aging, but this can be overcome by modification and addition of antioxidants.
Woven bags are generally white or off-white in color, non-toxic and odorless, and generally less harmful to the human body. Although they are made of various chemical plastics, they are highly environmentally friendly and can be recycled easily. Large;
Woven bags are widely used, mainly used for packaging and packaging of various items, and are widely used in industry;
Plastic woven bags are made of polypropylene resin. The main raw material is extruded and stretched into flat yarn, and then weaved and made into bags.
Composite plastic woven bags are made of plastic woven cloth as the base material and compounded by casting method.
Used for packaging 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 is divided into seam bottom bags, seam bottom bags, insert bags and adhesive sewing bags.
According to the effective width of the bag, it is divided into 450, 500, 550, 600, 650 and 700mm. Special specifications are agreed upon by both parties.
Application Scope
Packaging Bags
1. Industrial and agricultural product packaging bags
Due to product resource and price issues, there are 60 packaging bags in our country every year 100 million woven bags are used for cement packaging, accounting for more than 85% of bulk cement packaging. With the development and application of flexible container bags, plastic woven container bags are widely used in maritime, transportation and packaging of industrial and agricultural products. In the packaging of agricultural products, Plastic woven bags have been widely used in aquatic product packaging, poultry feed packaging, farm covering materials, crop planting sunshade, windproof, hail-proof sheds and other materials. Common products: feed woven bags, chemical woven bags, putty powder woven bags, Urea woven bags, vegetable mesh bags, fruit mesh bags, etc.
2. Food packaging bags
Rice, flour and other food packaging are gradually packaged in woven bags. Common woven bags include: rice woven bags, flour woven bags, corn woven bags, etc. bag.
3. Tourism transportation industry
Plastic woven fabrics are used in temporary tents, parasols, various travel bags, and travel bags in the tourism industry, and various tarpaulins are widely used Covering materials for transportation and storage, replacing cotton tarpaulins that are prone to mildew and bulky. Plastic woven fabrics are also widely used in fences and net covers during construction. Common ones include: logistics bags, logistics packaging bags, freight bags, freight bags, etc. Packaging bags, etc.