Wuhan Hyundai Shrink Film
DATE：2020/7/20 8:35:52 / READ： / SOURCE：This station
Wuhan Hyundai Shrink Film
Wuhan Hyundai Shrink Film is a film that shrinks or seals the package in the vertical and horizontal directions under the conditions of use (heat and external force), thereby shrinking or sealing the package, and maintaining long-term tension on the package. This kind of functional film is different from other functional films that use special functional master batches or additives to obtain specific functions. Its defrosting function mainly depends on the characteristics of the high material itself and the special molding process conditions. The shrink film described in this chapter includes heat shrinkable film and stretched (cold) shrinkable film. The heat-shrinkable film has a heat-shrinking function due to the directional stretching process and the unique "memory function" of the polymer. Heat shrinkable film is divided into two-way (longitudinal and transverse) heat shrinkable film (longitudinal and transverse shrinkage at the same time, but the shrinkage rate is not necessarily the same); unidirectional heat shrinkable (longitudinal or transverse heat shrinkable) film. Choose different equipment, the heat shrinkable film can be cut into single-layer heat shrinkable film and multilayer composite heat shrinkable film. According to different uses, heat shrinkable film can be divided into heavy packaging heat shrinkable film (container packaging film), light packaging heat shrinkable film (small package film) heat shrinkable sleeve, etc. Heat-shrinkable films used in industrial production, including cylindrical films. www.handern.com Breathable Film EquipmentSheet film, film bag, etc. Stretched (cold) shrinkable film is a sheet-like film. Compared with heat shrinkable film, it can shrink and fasten the packaging film without heating, also known as stretch film or stretched film. It is an extremely thin film made of the high elongation, puncture resistance and the self-adhesive properties of low-density polymers (or the addition of self-adhesive polymers) of certain polymers. The stretch shrink film is made by extrusion casting or extrusion blown film method, using different equipment, can produce single layer (double-sided self-adhesive) stretch shrink film, multi-layer composite (single side) stretch shrink film. According to different uses, stretch shrink film is divided into manual stretch shrink film, pre stretch machine stretch shrink film, anti-condensation food preservation film, etc. Shrink film is generally transparent in natural color. www.handern.com Breathable Film Equipment
Commonly used plastics for making heat-shrinkable films include: polyethylene (PE), polyvinyl chloride (PVC), poly internal ene (PP), polystyrene (FPS), styrene butadiene copolymer (BS), ethylene vinyl acetate Copolymer (EVA), polyvinylidene chloride (PVDC), polyester (PET), etc. The most used materials are DPE heat shrinkable film and hard PVC heat shrinkable film. Common methods for manufacturing heat shrinkable film include: ① Extrusion blowing method. It also includes a one-step inflation method with upper blowing and cooling, a one-step inflation method with downward blowing and water cooling, and a two-step inflation method with downward blowing and water cooling and heating. ②Extrusion casting method (flat film method). It also includes two-way simultaneous stretching orientation method, vertical and horizontal direction gradual stretching orientation method, etc. www.handern.com Breathable Film Equipment
Commonly used plastics for making stretch (cold) shrink films include polyethylene (LLDPE, LDPE), ethylene vinyl acetate copolymer (EVA), polybutene (PB), etc. www.handern.com breathable film equipment
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