The characteristics and application of stretch film
Stretch film is based on PVC in China, and DOA is used as a plasticizer and has self-adhesive effect, but it has disadvantages such as environmental problems, high cost (larger than PE, small unit packaging area), and poor stretchability. At present, LLDPE is the main one, including C4, C6, C8 and metal PE (MPE), so let's learn about the characteristics and applications of the stretch film!
PE stretch film is mainly blown film, which has developed from a single layer to two layers and three layers. At present, LLDPE stretch film is mainly produced by casting method, because the production of casting production line has the advantages of uniform thickness and high transparency, and is suitable for the requirements of high-ratio pre-stretching. A good stretch film has the characteristics of high transparency, high longitudinal elongation, high yield point, high transverse tear strength, and good puncture performance. In addition, the material density of the stretched film also affects the performance of the film. As the density increases, the degree of orientation is high, the flatness is good, the longitudinal elongation is high, and the yield strength is high, but the transverse tear strength, puncture strength and light transmittance decrease. , so comprehensive performance of various aspects, in the non-adhesive layer to form medium density linear polyethylene (lmms
PE stretch film (also known as roll film) has high tensile strength, tear strength, and good self-adhesiveness, which can wrap objects together to avoid loosening during transportation. The film has excellent transparency, wraps the object beautifully, and makes the object waterproof, dustproof, and damage-resistant.
The specific characteristics of stretch film (winding film):
1. Unitization: This is one of the great characteristics of stretch film packaging. The extremely strong winding force and shrinkage of the film make the product compact and fixed into a unit, and the scattered small parts are combined into one, and the product will not loosen and separate even in an unfavorable environment, without sharp edges and Adhesive, no damage.
2. One-time protection: One-time protection provides product surface protection, forming a slight protective appearance around the product to achieve the purpose of dust-proof, oil-proof, moisture-proof, water-proof, and anti-theft. It is particularly important that the stretch film packaging should apply force to the packaged items evenly to avoid damage to the items due to uneven force. This is what traditional packaging methods (bundling, wrapping, tape, etc.) cannot do.
3. Compression fixity: Wrap the product with the shrinkage force of the stretched film to form a compact machine that does not take up space, and wrap each pallet of the product well, which can effectively prevent product dislocation and movement during transportation. At the same time, the adjustable tensile force is used to make the hard product in close contact, so that it is in close contact with the hard product
4. Cost saving: Using stretch film for product packaging can effectively reduce the cost of use. The use of stretch film is only about 15% of the original box packaging, about 35% of the heat shrinkable film, and about 50% of the carton packaging. At the same time, it can reduce the labor intensity of workers, improve packaging efficiency and packaging grade. Stretch film (wound film) application fields:
Stretch film (also known as roll film) is mainly used in conjunction with pallets to replace small containers with scattered goods for packaging. Because it can reduce the cost of transporting and packaging a large number of goods by more than 30%, it is widely used in the batch packaging of many products in industries such as electronics, building materials, chemicals, metal products, auto parts, wires and cables, daily necessities, food, and paper making. In the field of warehouse storage, in order to save space and floor space in foreign countries, most of them use stretch-wound film tray packaging for three-dimensional storage and transportation.