Polyethylene (PE) film The air permeableness of letter film is comparatively large, and because the density increases, its air permeability decreases.
letter film has wet resistance and moisture permeability small. synthetic resin film (PE) is factory-made into low-density, medium-density, and high-density in step with totally different producing strategies and management methods. Products with totally different properties like synthetic resin and cross-linked polyethylene.
Low-density synthetic resin (LDPE) Its density is 0.92g/cm2.
The low-density synthetic resin film has smart transparency and heat-sealability, and maybe waterproof and moisture-proof; The durability is low, the tensile elongation is large, and it's straightforward to wrinkle. For the film below 0.03mm, the stress management ought to be small, and The tension ought to be constant, particularly once it's heated, it is easier to deform, inflicting issues in color registration. Therefore, when drying, the surface temperature of the film mustn't be too high (Within 550C).
in step with totally different film-forming processes, it is divided into a blown film (IPE), solid film (CPE), low foam film, etcetera Several kinds. The durability and gap of IPE film are higher than CPE film. it's written on the front facet and may be used as food baggage and consumer goods bags. Etc.; CPE film thickness is uniform, surface gloss, transparency, and heat-sealability ratio, the letter is better, is written on each side, however production High cost.
CPE film is principally used because the inner layer of composite baggage and also the packaging of cosmetics, pickles, and pastries; low-foaming film packaging Good decoration, thick texture, demanding to be stretched and deformed, written on the front, used as twelvemonth pictures, logos, and handbags, etcetera Medium Density synthetic resin (MDPE) Its density is regarding 0.93～0.93. 94g/cm2 performance is between high-density and low-density polyethylene.
High-density synthetic resin (HDPE) The density is 0.94-0.965g/cm2. the warmth resistance and mechanical strength of HDPE film are more than that of rarity synthetic resin The film is good, the tensile elongation is small, the film thickness is mostly on top of 0.03mm, however, the transparency is poor.
Use front printing, in the main Used as a vest bag, trash bag, and liner bag, etcetera Cross-linked synthetic resin (CLPE) Because it's higher heat resistance, tensile strength, heat shrinkage, and barrier properties than alternative synthetic resin products, its applications are With any expansion, it's presently principally used as a heat-shrinkable packaging film.
Generally speaking, because the density increases, the mechanical properties, and barrier properties can increase accordingly, and also the heat resistance and hygiene are better. The same secret Because of the various film forming process, the synthetic resin of a high degree additionally has different properties. this is often} as a result of the secretion methodology can quickly cool down, The crystallinity is low, the transparency is high, and also the murkiness is small, however, the molecular arrangement tends to be a lot of irregulars, that the barrier property is small, that is, the transmission Larger, lower elongation, poor tear resistance.
Edit this paragraph letter film production method The film processing machine may be a robot that heats and melts plastic particles then blows them into a film. First, add dry synthetic resin particles Into the lower hopper, the particles enter the screw from the hopper by the burden of the particles themselves. once the pellets inherit contact with the threaded bevel, the rotating bevel surface A thrust perpendicular to the bevel surface is generated on the plastic, and also the plastic particles are pushed forward. throughout the process, thanks to the plastic and the screw, The friction between the plastic and also the barrel and the collision and friction between the particles are bit by bit liquid thanks to the external heating of the barrel.
Melting The plastic is filtered by the pinnacle to get rid of impurities from the die opening of the die, cooled and inflated by the air ring, ironed by the material plate, and rolled by the traction roller Take the finished film and roll it into a tube.Tags: PE film, Polyethylene (PE) film, Polyethylene film