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HS-CODE
95-
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Detailed Description
The pearlescent film is made of polypropylene resin as raw material, adding calcium carbonate and pearlescent pigment, and then mixed by biaxial stretching. Due to the mechanical foaming method, the proportion of perlite film is only about 0.7, and the proportion of PP is about 0.9, so the soft packaging enterprises are willing to choose, because of low price and good decoration, good performance. BOPP pearlescent film /CPP, BOPP pearlescent film /PE and so on, usually used in cold drink packaging, such as: ice cream, heat sealing labels, sweets, biscuits, snacks packaging and so on.
principle
Pearlescent film is a kind of biaxially oriented heat setting BOPP film which is produced by mixing pearlescent pigment into plastic particles. A typical pearl film is BOPP pearl film produced by A/B/A3 layer extruding method, where B is the mixing of the pearlescent masterbatch PP, A PP is a copolymer with pearl film surface properties vary, with good heat sealing. Biaxial stretching is performed below the melting point of the B material and above the melting point of the A material.
The Pearl contains more inorganic pigment particles B material, biaxial tensile results: Polypropylene molecules were oriented along the direction of the external force, and between the pearlescent pigment particle distance is widening, the formation of pores, the B layer into mechanical foam. Therefore, the A/B/A structure of the Pearl film is a biaxially oriented BOPP foam film, the specific gravity is smaller than the general BOPP film, only 0.7 ~ 0.75, while the general BOPP film weight is about 0.9.
The A layer has the function of protecting the B layer in the BOPP pearlescent film, and endows the pearlite film with a certain heat sealing property. Therefore, the A/B/A structure of the pearlite film has good heat sealing property. Using only B material to produce pearlescent film, porous film and can only rely on small amount without PP molecular orientation slightly heat sealing, pearl film heat sealed is easy to peel.
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China [CN] 
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