The classification of plastic film and blown film technique

In daily life will find plastic film is different, such as plastic bags, some transparent soft, some stiff; Cling film and plastic bags. In fact, this is because the cause of numerous types of plastic film, all kinds of thin film USES each are not identical. The variety of plastic film classification does not have unified regulation. Classification commonly used are: ( 1) According to the plastic molding with raw material classification: is there a polyethylene film, polypropylene film, PVC film, polyester film, etc. （ 2) According to the plastic film use classification: agricultural film ( Here can be divided into the membrane and according to the specific use of agricultural greenhouse film) ； Packaging film ( Packaging film according to their specific purposes and can be divided into food packaging film and all kinds of industrial products with packaging film, etc. ) And used in special environment, with special use of breathable membrane, water soluble film and has the performance of piezoelectric thin film and so on. ( 3) According to the forming methods of the plastic film classification: extrusion plasticizing, then blow molding of thin film, called the blown film; By extrusion plasticizing and molten material from the mold mouth stretch forming film, called stretch film; In rolling machine has a few root roller rolling molding material made of thin film, referred to as the rolling thin film. There are several plastic film forming method, flow, extrusion, blow molding, these three kinds of technology are common. LiuYanFa is produced by melt salivate cold snap in a flat without stretching, non-directional squeeze film. There is no obvious orientation structure. Extrusion is often seen in a uniaxial tensile and two-way stretching method, the two-way stretch for producing methods of concern in recent years. Two-way stretch technology basic principle as the high polymer material by extruder first heated melting extrusion into thick slices, again above the glass transition temperature below the melting point of the appropriate temperature range, through the successively along the longitudinal and transverse tensile machine must be a multiple of stretching, the molecular chain orientation in parallel to the plane of the membrane and orderly arranged, and then heat setting under the taut state, make the orientation of the macromolecular structure is fixed, the last film after cooling and subsequent processing. Blow molding is usually extrusion blow molding manufacturing, material plasticizing extruder, forming tube billet blow molding, cooling, traction, coiling again. Blown film is orientation. Forming in a different way from the above three kinds of technology, the electrical conductivity of membrane are significantly different; Stretch film at the same time compared with the unstretched film barrier performance improvements, such as gas permeability decrease, optical properties, transparency and surface glossiness increases, temperature, good size, good performance of uniform thickness.
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