Sealable plastic bag

                                                                     Sealable plastic bag

                                                                                   Characteristics and production of composite bags

      Firstly, various materials with different characteristics are composite together to improve the breathability, moisture permeability, oil resistance, water resistance, and chemical resistance of packaging materials, enabling them to exhibit insect resistance, dust resistance, microbial resistance, isolation from light, fragrance, odor, and other odors, as well as better mechanical strength and processing applicability for heat resistance, cold resistance, and impact resistance, and have good printing and decorative effects.

     Classified by packaging method: Three sided sealed, Yin Yang bag, Middle sealed, Pillow shaped bag, Five sided sealed bag, Self standing bag, Zipper bag, Straw bag, Roll material, Cover material, etc. Classified by function: High Yin diaphragm bag, Steaming film bag, Anti static film bag, Antibacterial film bag, Anti fog film bag, Vacuum bag, Anti chemical film bag, Deoxygenation packaging film bag, Modified Atmosphere packaging film bag, etc. Classified by material: Laser coated aluminum film composite paper material, Laser transfer paper material, Paper composite material, Aluminum composite material, Plastic composite material, Fabric composite material, etc.

In industry, it also includes copolymers of ethylene with small amounts of alpha olefins. Polyethylene is odorless, non-toxic, and feels like wax. It has excellent low-temperature resistance (with a minimum operating temperature of -70~-100 ℃), good chemical stability, and can withstand most acid and alkali corrosion (not resistant to acids with oxidizing properties). It is insoluble in general solvents at room temperature, has 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 in paper plastic composite bags vary depending on the variety, mainly determined by its molecular structure and density. Paper plastic composite bags can produce products with different densities (0.91-0.96g/cm3) using different production methods. Polyethylene can be processed using the molding methods of general thermoplastic plastics (see plastic processing). It has a wide range of applications, mainly used to manufacture films, containers, pipelines, monofilaments, wires and cables, daily necessities, etc., and can also be used as high-frequency insulation materials for televisions, radars, etc. Made of kraft paper with a skid resistance of over 25 degrees, easy to stack; Good moisture resistance, easy loading and unloading, and modular transportation achieved by manpower or forklifts. Currently, it is the most popular and practical ordinary packaging material. Water soluble yarn composite packaging bag is a new type of packaging bag made by composite bag machine technology, which continuously wraps the weft yarn without a middle seam. The structure of the paper yarn composite packaging bag is composed of two layers of international paper bag paper, inner and outer, with a mesh like water-soluble yarn bonded in the middle, and a three in one composite of kraft paper bag. Due to the fact that PVA water-soluble yarn can dissolve in hot water at 80 ℃ without formaldehyde treatment, used waste bags can be recycled and reused after hydrolysis, without polluting the environment. The connotation of "new paper plastic composite bag industry" and alternative products.

Based on the evaluation system and quantitative indicator system of the "New Paper Plastic Composite Bag Industry" and its substitutes, a new perspective was used to deduce and accurately predict the development of China's paper plastic composite bag industry. On this basis, a comprehensive study was conducted on the administrative divisions and the development of the paper plastic composite bag industry in the four major metropolitan areas of China.

      The paper plastic composite bag is made of refined white kraft paper or yellow kraft paper on the outside, and plastic woven cloth on the inside. The plastic particles PP are melted by high temperature and high pressure, and the kraft paper and plastic woven cloth are combined together Additional inner membrane bags can be added. The paper plastic composite bag is equivalent to a sewn bottom open pocket. It has superior characteristics such as good strength, waterproof and moisture-proof. Paper plastic composite bag - Composite plastic woven bag is made by compounding plastic woven bag (referred to as cloth) as the substrate through casting method (cloth/film composite is two in one, cloth/film/paper composite is three in one). Paper plastic composite bags do not have special electrostatic safety characteristics, therefore, they are not recommended for handling sensitive and flammable dust and powder. In addition, they cannot be used in situations where there are dust clouds or flammable solvent vapors present. This type of paper plastic composite bag is usually made of ordinary woven polypropylene fabric and is an insulator. Sometimes, according to usage requirements, Type A paper plastic composite bags may use inner lining bags or surface coating treatments.