Polypropylene (PP)
A thermoplastic resin obtained by polymerization of propylene. There are three configurations, namely, isotactic object, random object and syndiotactic object. Industrial products are mainly composed of isotactic object. Polypropylene also includes copolymers of propylene and a small amount of ethylene. It is usually a translucent colorless solid, odorless and non-toxic. Due to the regular structure and high crystallization, the melting point is as high as 167 ℃, and the products can be sterilized with 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. The disadvantages are poor low-temperature impact resistance and easy aging, which can be overcome by modification and addition of antioxidant respectively.
The woven bag is generally white or grayish white, non-toxic and tasteless, and generally less harmful to human body. Although it is made of various chemical plastics, it has strong environmental protection and recycling efforts;
Woven bags are widely used, mainly for packaging and packaging of various articles, 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 wires, then woven and made into bags.
Composite plastic woven bag is made of plastic woven cloth as the base material by tape casting.
It is used for packing powdery or granular solid materials and flexible articles. 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 sewing bottom bags, sewing side bottom bags, inserting pockets and gluing sewing bags.
According to the effective width of the bag, it can be divided into 450, 500, 550, 600, 650 and 700 mm, and the special specifications shall be determined by both parties.
The main raw material for foreign production is polyethylene (PE), while the domestic production is mainly polypropylene (PP), which is a thermoplastic resin made from ethylene through polymerization. In industry, it also includes ethylene and a small amount of α－ Copolymers of olefins. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the minimum use temperature can reach - 70~- 100 ℃), good chemical stability, can withstand the corrosion of most acids and alkalis (not resistant to acids with oxidizing properties), insoluble in general solvents at room temperature, low water absorption, and excellent electrical insulation performance; However, 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. The products with different densities (0.91 ～ 0.96g/cm3) can be obtained by different production methods. Polyethylene can be processed by the general thermoplastic molding method (see Plastic Processing). It has a wide range of applications, mainly used to make films, containers, pipes, monofilament, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for television, radar, etc. With the development of petrochemical industry, polyethylene production has developed rapidly, accounting for about 1/4 of the total plastic output. In 1983, the total production capacity of polyethylene in the world was 24.65Mt, and the capacity of plants under construction was 3.16Mt.
Sichuan Quanyuan plastic industry is a comprehensive large-scale sales enterprise integrating production, sales, customization and trade. It has a number of branches and factory departments for physical production, sales, customization and R & D. The company entered the integrated plastic packaging industry in advance from the production of single plastic (woven bags, plastic bags, color printing composite bags). After years of efforts, it has realized the one-stop supply of overall plastic packaging customization, production, design, plate making, proofing, warehousing and logistics. With the update and improvement of production technology and equipment, the output increases rapidly, and the product quality becomes more stable and mature. The main products of Quanyuan plastic industry are: plastic woven bags, ton bags, color printing composite woven bags, paper plastic composite bags, pure kraft paper bags, composite plastic food bags, vest bags and other plastic products. With an annual output of 1.5 million container bags, 120million color printing composite woven bags and tens of millions of other food composite bags, our company's "export qualification", "plastic packaging and printing license", "food hygiene license", "national industrial product production license" and other qualifications, after 12 years of sales experience focusing on plastic packaging R & D, production and customization. We have established the sales brand "Quanyuan plastic industry" located in Chengdu head office, Sichuan Province, to become a leader in the plastic packaging industry. Packaging products are mainly of high quality, And "high quality environmental protection - harmless" "Quality is the primary condition. Quality is the foundation and integrity management! For 12 years, Quanyuan plastic industry has focused on the customization and production of plastic packaging for chemical fertilizer, chemical industry, metallurgy, minerals, food and other products, and is committed to meeting the packaging requirements of various enterprises. Quanyuan plastic industry has launched customized, free design, complete categories, small batch orders, one-stop procurement, correct use of packaging, door-to-door service for customers, which has won the recognition and trust of the majority of users. I We have established long-term friendly cooperative relations with many well-known domestic enterprises. All employees of Quanyuan plastic industry will take integrity as the foundation, customer as the center, and high-quality service as the purpose. We are willing to work with you to create a brilliant career!
Tianquan Zhang
328609569@qq.com