stretch film packaging stetch packing film is a stretch and with a flexible

stretch film packaging stetch packing film is a stretch and with a flexible, continuous, single or double coated adhesive plastic film. The stretch film stretch wrap the necessary materials, a unique self-adhesive, high tensile strength, excellent puncture resistance and good transparency, and packaging process is simple. Packaging, stretch film stretch subjected to stress, be firmly affixed to cover food during transport can play in the food or food tray, fixed, the role of protection and cleaning. The stretch film is mainly used for cargo tray unit carton stacking and wrapping large quantities of glass bottles, plastic bottles, cans and other products packaging.
stretch film packaging technology is the use of a tensile the tensioning nature of film, strapping assembled goods, so that the stretch film tension spread to the entire cargo surface, solid goods and bind them in one film can play, so that handling and transportation of goods, the role of the rubber band, with the changes in the force stretching, with a strong resistance to impact and resistance to vibration force. In order to fully develop and utilize this technology, must be familiar with and master the performance and characteristics of the stretch film to the appropriate choice of materials and equipment.
Paste refers to the ability to stretch film paste. Two ways to stretch the film to get this performance: ① manufacture of easy self-adhesion of smooth and has a shiny surface; ② paste additives to the material. It can migrate to the surface of the stretch film and stretch film interface wetting, thereby contributing to the paste. Paste by humidity, dust and material rigidity. In order to avoid loading tray to rely on the mutual adhesion of the film together, the development of single-sided pasted stretch film. Toughness refers to the pallet stretch film extension and resistance to puncture and resistance to rupture the ability. horizontal stretch film tear resistance scalability is very important, if this performance is low, the gap will be in the horizontal expansion, so that the spread of packaged goods.
Stretching refers to the ability of stretch films by tension when stretching. Of LLDPE pallet stretch film in the longitudinal tensile, thickness and width of the stretch film is gradually reduced, often referred to as necking. Generally vertical as much as possible multi-stretch, but stretching too much, make the stretch film wrapped lap reduction in the thickness is not sufficient, increase applied to the crushed lesser force on the loading or soft goods, while increase the risk of tear extension. Therefore, in order to stretch film pe of an extension in the the necking minimum conditions, the use of stretch film pre-stretching device ofLLDPE stretch film is not a stretch in the wound, but in the pre-stretch before winding. The device by the two rotation speed rubber-coated roller. Their speed can be changed in order to generate proportional to the stretch percentage. Pre-stretching allows stretch film pull longer and thinner, which can reduce packaging costs, but down at the end of the intensity of the stretch film, and therefore more suitable for loading requires less tension, so as not to pull off. Pre-stretch may also make pallets paste of stretch film to lose, is being studied to improve paste thick film used as a pre-stretch film.

Stress retention refers to the ability to maintain tension pallet stretch film stretch wrapping. All stretch film begins to relax immediately after stretching, relaxation of 99% occurred within 24h. Stretch film stretch to l30% of its original length, and after 16h of relaxation, the stress retention: ethylene vinyl acetate, low density polyethylene and linear low density polyethylene, 60% to 35%, poly vinyl chloride to 25%. Effective tensile stretch film use to maintain its essential characteristics (toughness, stress to maintain) the maximum amount of stretch. Effective tensile higher the value, the less packaging materials required for each pallet, packaging costs are lower.