Are you PP woven bag supplier?
A woven bag, also known as a snakeskin bag in China, also can name pp woven sack, a plastic woven bag. It is a kind of plastic bag used for packaging, and its raw materials are generally polyethylene, polypropylene, and other chemical plastic raw materials. Weaving density refers to the number of warp and weft yarns in a 100mm×100mm braid
Explanation of plastic weaving terms: woven bags are mainly: plastic woven bags made of polypropylene (English name pp) as the main raw material, which is extruded and stretched into flat silk, and then woven, woven, and bagged.
The commonly used woven cloth density is 36×36/10cm², 40×40/10cm², 48×48/10cm².
1. Braid density tolerance.
Braid Density Tolerance refers to more or fewer tapes than a given standard braid density.
2. The mass per unit area of the woven roll.
The unit area weight of the woven fabric is expressed by the weight of square meters, which is an important technical indicator of the 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 a major part of the cost control of the production enterprise.
3. Woven fabric tensile load.
Tensile load is also called tensile strength, tensile strength. The woven fabric bears tensile loads in both warp and weft directions, so it is called warp and weft tensile loads.
The width of various woven fabrics directly affects the bag-making process. For tube cloth, the width is indicated by the warp, and the warp is equal to half of the circumference.
Width shrinkage rate, the width of all woven fabrics after weaving and winding, after unwinding, cutting, printing, and sewing, the width of the bag is slightly smaller than the width at the time of winding, we call it width shrinkage.
- PP flat silk woven fabric feels thicker, wider, and stiffer.
- HDPE tape braid feels soft, lubricated, and not dense.
- Adding calcium masterbatch to PP flat silk material will make the hand feel very broad, and adding less HDPE in PP will make it softer.
- The flat wire is narrow, the weaving is flat, the hand feel is soft, the flat wire is wide, and there are many folded wires when weaving the cloth, and the hand feels rough.
The main raw material for foreign production is polyethylene (PE), and domestic production is mainly polypropylene (PP), which is a thermoplastic resin obtained by the polymerization of ethylene. In industry, copolymers of ethylene and small amounts of alpha-olefins are also included. Polyethylene is odorless, non-toxic, feels like wax, has excellent low-temperature resistance (minimum operating temperature can reach -70 ~ -100 ℃), has good chemical stability, and can resist the erosion of most acids and alkalis (not resistant to oxidation properties). acid), insoluble in general solvents at room temperature, low water absorption, and excellent electrical insulation performance; but polyethylene is very sensitive to environmental stress (chemical and mechanical effects) and has poor heat aging resistance. The properties of polyethylene vary from variety to variety, mainly depending on the molecular structure and density.
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Different production methods can be used to obtain products with different densities (0.91-0.96g/cm3). Polyethylene can be processed by the usual thermoplastic molding methods (see Plastics 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 insulating materials for TVs, radars, etc. With the development of the petrochemical industry, polyethylene production has developed rapidly, and the output accounts for about 1/4 of the total plastic output. In 1983, the world’s total polyethylene production capacity was 24.65Mt, and the capacity of the units under construction was 3.16Mt. Yes, we are a pp woven bag supplier and produce the bags as per the customer’s details request.
A thermoplastic resin obtained by the polymerization of propylene. There are three configurations of isotactic, random, and syndiotactic, and industrial products are mainly composed of isotactic. Polypropylene also includes copolymers of propylene with small amounts of ethylene. Usually translucent colorless solid, odorless, and non-toxic. Due to the regular structure and high crystallization, the melting point is as high as 167 ° C, heat resistance, and the products can be sterilized by steam, which is its outstanding advantage. 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. The disadvantage is that it has poor low-temperature impact resistance and is easy to age, but it can be overcome by modification and the addition of antioxidants.
- The color of polypropylene bags 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 has strong environmental protection and greater recycling efforts;
Woven bags are widely used, mainly used for 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, which is extruded and stretched into flat wire, and then woven and bagged.
- The composite plastic woven bag is made of plastic flour sack fabric as the base material and compounded by the casting method.
For packaging powdered 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.
According to the sewing method, it is divided into a seam bottom bag, plain 50kg polypropylene, insert pocket, and adhesive sewing bag.
According to the effective width of the bag, it is divided into 450, 500, 550, 600, 650, and 700mm, and the special specifications are negotiated by both parties.
Scope of application
1. Industrial and agricultural product packaging bags
Due to product resources and price issues, 6 billion woven bags are used for cement packaging in my country every year, 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 at sea. Transportation and packaging of industrial and agricultural products, in the packaging of agricultural products, polypropylene woven sacks have been widely used in aquatic product packaging, poultry feed packaging, covering materials for farms, sunshades for crop planting, 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
Food packaging such as rice and flour is gradually used in woven bags. Commonly woven bags include rice woven bags, flour woven bags, corn woven bags, and other woven bags.
3. Tourism and Transportation
Temporary tents, parasols, various travel bags, and travel bags in the tourism industry all have plastic-woven applications. Various tarpaulins are widely used as covering materials for transportation and storage, replacing cotton tarpaulins that are prone to mildew and bulky. Fences and nets in construction are also widely used in pp woven fabric. Common ones are logistics bags, logistics packaging bags, freight bags, freight packaging bags, etc.
Since the development of geotextiles in the 1980s, the application fields of plastic woven fabrics have been broadened, and they are widely used in small water conservancy, electric power, highway, railway, seaport, mine construction, and military engineering construction. In these projects, geosynthetics have the ability to filter, drain, reinforce, isolate, anti-seepage, and other functions, plastic geotextile is a kind of synthetic geotextile.
Flood Fighting Materials
Woven bags are indispensable for flood relief and disaster relief. Woven bags are also indispensable in the construction of dams, river banks, railways, and highways. They are flood-control woven bags, drought-control woven bags, and flood-control woven bags.