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How many kinds of plastic packaging film blown film production function
How many kinds of plastic packaging film blown film production function
1, biaxially oriented polypropylene film (BOPP)
After biaxially oriented polypropylene film is formed from polypropylene granules by co-extrusion sheet, and then stretching crossbar and two bias obtained. Since molecular orientation stretching, so the physical stability of such a film, the mechanical strength, air tightness is good, high degree of transparency and light, extremely resistant, is currently the most common of the printed films, the thickness is usually 20 to apply 40 μ m, the most common is 20 μ m. Biaxially oriented polypropylene film tension drawback is poor heat-sealing properties, it is often used as the outer layer of the film composite film, such as polyethylene composite film after moisture resistance, transparency, strength, stiffness and printability than ideal, in the practical costumes dry food. Because the appearance of biaxially oriented polypropylene film non-polar, high crystallinity, low appearance of free energy, so its performance is poor printing, inks and adhesives for poor adhesion, is necessary to hold appearance before printing and composite handle punishment.
2, low-density polyethylene film (LDPE)
Low-density polyethylene film commonly accepted blown and cast made of two processes. The thickness of the cast polyethylene film symmetry, but because of the high cost, the current rarely used. Blow by blow molding grade polyethylene film PE particles blown by blow molding machines, and low cost, so the most common. Low-density polyethylene film is a translucent, light, texture softer film with excellent chemical stability, heat sealing, water resistance and moisture resistance, resistance to freezing, can boiled. Its disadvantage is that oxygen tension isolation is poor, commonly used in flexible packaging material of the inner layer film, and is currently the most common, the largest amount of a plastic packaging film, plastic packaging films accounted for 40% of consumption above .
Because the polyethylene containing no polar group in the molecule, and the high degree of crystallinity, the surface free energy, so that the printing properties of the film is poor, and the adhesive of poor adhesion of the ink, and the composite thus necessary before printing held appearance handle punishment.
3, a polyester film (PET)
Polyester film of poly (ethylene terephthalate) and therefore is material, extrusion method accepted into thick slices, and then biaxially oriented film material made. It is a colorless, transparent, light film, excellent mechanical properties, high stiffness, hardness and toughness, puncture resistance, abrasion resistance, high temperature along the low temperature, chemical resistance, oil resistance, air tightness and Paul fragrance Good, is one of the barrier composite film substrate commonly used. But the higher the cost of the polyester film, usually having a thickness of 12mm, often used for cooking and packaging of the finished material, the printing property is good.
4, a nylon film (PA)
Nylon film is a very strong film, transparency, and good light, tensile strength, high tensile strength, but also has good heat resistance, cold resistance, oil resistance and organic solvent resistance, abrasion resistance, excellent puncture resistance and softer than force, excellent oxygen barrier properties, but poor steam isolation, moisture absorption, moisture permeability larger, less heat sealing, suitable for rigid packaging materials, such as greasy food, meat, fried foods, vacuum-packed food, cooking food.
5, cast polypropylene film (CPP)
Cast polypropylene films are accepted cast polypropylene film production process can be divided into ordinary cooking class CPP and CPP are two, excellent transparency, the thickness of the symmetry, and the performance of vertical and horizontal symmetry, often used in the composite films layer material. Ordinary CPP film thickness is usually between 25 ~ 50μm, and the OPP composite transparency is better, looks bright, feel strong, the usual gift bags have accepted such material. This film also has a good heat sealability. CPP film thickness of the cooking stage is generally between 60 ~ 80 μ m, the ability of 121 ℃, 30 min of high-temperature cooking, oil resistance, good gas tightness, and high heat sealing strength, the inner packaging of meat are usually acceptance cooking class CPP film.
 

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