PE film is a kind of material with good toughness, which is not easy to be crushed by general plastic crusher. Because PE film is soft and tough, it is not easy to be chopped, not to mention the high temperature of the cutter at high speed, which will make LDPE melt and stick to the blade. The granulation of PE can be directly put into the feed inlet of the extruder in strips, and the PE film is pulled into the barrel by the shear force of the screw to be heated, melted and extruded for granulation. The first-class materials recovered from PE can still be blown into films for non-food and medicine packaging, and also widely used in the production of Oxford cloth leather and tarpaulin, with broad prospects.
PE heat-shrinkable film is widely used in the overall packaging of wine, cans, mineral water, various beverages, fabrics and other products. The product has good flexibility, strong impact resistance and tear resistance, is not easy to be damaged, is not afraid of moisture, and has large shrinkage.
PVC shrink film, adding ingredients to enhance its heat resistance, toughness, ductility and so on. The top layer of this surface film is paint, the main component in the middle is PVC, and the bottom layer is adhesive. It is a kind of synthetic material which is deeply loved, quite popular and widely used in the world today. Among the materials that can be used to make three-dimensional surface films, PVC is the most suitable material.
PVC film is widely used in building materials industry and packaging industry because of its unique properties (rain-proof, fire-proof, antistatic and easy molding) and low input and high output. Therefore, PVC film has the characteristics of high transparency, good gloss and high shrinkage.
Polyethylene heat shrinkable film parameters
Detailed parameters of polyethylene heat shrinkable film:
Width: single piece 0.2m ~ 9m; transverse tear strength: ≥ 40kn/m.
Longitudinal 0.4m~4.2m cylindrical diaphragm: ≥40kn/m
Thickness: 0.015mm ~ 0.35mm ~ 0.35mm.
Tensile strength: transverse: ≥ 17mpa, longitudinal: ≥ 17mpa.
Shrinkage rate: transverse 15%~30%, longitudinal 50%~70%.
Elongation at break: ≥350%
Shrinkage temperature: 120℃~ 180℃
Volume core internal code: 76mm
Specific gravity: 0.925g/cm3
Novel winding intelligent pre-stretched winding film
"Wrapsmart pre-stretched winding film is a new generation of green and environmentally friendly hand-stretched winding film newly developed abroad. This product adopts a brand-new pre-stretching process, which makes the original mother film lighter and thinner, while the physical tensile strength and wrapping force are basically unchanged. And no special packaging equipment is needed, which is suitable for manual packaging, saving time, effort and money!
This new generation of environmental protection wrapped film product with a thickness of 0.007mm(7μm) can reach the stability and protective performance of traditional film packaging 18 ~ 20 μ m, and this product is a domestic new technology product. Compared with the traditional winding film, it packs the same goods with less consumption and lower cost!
(1) Reduce atmospheric environmental pollution: As the thickness of pre-stretched winding film is obviously thinner, the usage of the same goods in packaging is also obviously reduced, resulting in a decrease in total transportation volume, thus reducing transportation energy consumption and waste gas emission and reducing atmospheric environmental pollution.
(2) Reduce the amount of garbage disposal.
When packaging the same goods, the amount of pre-stretched coating is obviously reduced, so the amount of recycled coating is correspondingly reduced by about 50%.
(3) Recycling: The environmentally-friendly wound film can be recycled and granulated with general recycling equipment in the factory 100%. It can not only reduce environmental pollution, but also save the cost of recycling packaging.
(4) Reduce the overall packaging cost: replacing the traditional stretched film with green film significantly reduces the total usage, so its use cost, transportation cost and storage space cost are all reduced.
(5) Easy to use and high working efficiency: due to the adoption of environmentally-friendly winding film, pre-stretching is labor-saving, and it can be operated by men, women and children, without special packaging machines and special packaging sites. Under the same weight, the length of each roll of environmentally-friendly wound film is more than twice that of ordinary wound film, which can reduce the number of film roll changes during packaging and save the cost of transportation, packaging and distribution.
Pre-stretched wound film is superior to traditional wound film.
Low price, good quality, environmental protection and convenient use.
Under the same weight, the actual packaging area of ultra-thin wound film is about 3 times that of traditional wound film on the market. Compared with the traditional plastic wrap, the cost savings are considerable. Moreover, our green plastic wrap is a high-strength pre-stretched single-sided adhesive plastic wrap, which is quite convenient to use and saves labor and money. The outer layer of the package is not easy to stick dust, and it is clean and hygienic. OPS (heat shrinkable film) is a new type of close-fitting packaging material that meets the requirements of environmental protection. OPS heat shrinkable film has high strength, high rigidity, stable shape, good luster and transparency. It is convenient to process, easy to color, good in printing performance and high in printing resolution, which is completely a material progress for trademarks that are constantly pursuing exquisite printing. Because of its high shrinkage and strength, OPS film can be closely attached to containers with different shapes, so it can not only print exquisite patterns, but also meet the needs of novel packaging containers with different shapes. This non-toxic, odorless, grease-resistant, food hygiene standard-compliant film allows designers to adopt eye-catching colors, realize 360 label design, and give full play to creativity and imagination, thus making the patterns of drinks and other commodities more vivid and prominent in label use.
OPS is a new type of body-fitted printing-grade packaging material that meets the international environmental protection requirements.
1)OPS can achieve 74% lateral shrinkage, and it is not easy to wrinkle during shrinkage. Shrinking can be done in a non-high temperature environment, so the heat-shrinkable label can be packaged outside the container. After the transverse contraction of the label is completed, the height of the label will hardly be shortened due to the longitudinal contraction.
2)OPS hardly produces crystallites. Because OPS resin is different from PVC resin in raw material refining process, it can greatly reduce the existence of crystallizing point and foreign matter.
3)OPS has light specific gravity. The specific gravity of OPS is only 1.05. For OPS, PVC and PET with the same thickness and area, the weight of OPS can be reduced by 25%.
The tear line of OPS label after shrinking is very symmetrical, which is easy to tear and will not destroy the overall effect of the label.
Small-scale heat-shrinkable film packaging equipment, carefully made according to international standards, has the characteristics of simple operation, wide application range, good sealing, high transparency, low cost and high grade, and is suitable for packaging small and medium-sized products. Heat shrinkable film machine and scaler are used on line to form a scaler line, which is widely used for fully-enclosed heat-shrinkable packaging of drugs, food, beverages, stationery, ceramics, daily chemicals, auto parts, knitting, electronic audio-visual products and other products, and is the scaler in the subsequent packaging line. PET heat shrinkable film is a new type of heat shrinkable packaging material. Because of its easy recycling, non-toxic, tasteless, good mechanical properties, especially in line with environmental protection, PET has become an ideal substitute for PVC heat shrinkable film in developed countries.
However, ordinary polyester is a crystalline polymer, and the thermal shrinkage of ordinary PET film can only be less than 30% after special process treatment. In order to obtain polyester film with higher thermal shrinkage, it must be modified. That is to say, in order to prepare high thermal shrinkage polyester film, it is necessary to modify the common polyester, namely polyethylene terephthalate. * * * The maximum thermal shrinkage of poly-modified PET film can reach more than 70%.
Thermal shrinkable polyester film is characterized by being stable at room temperature, shrinking when heated (above the glass transition temperature), and more than 70% of thermal shrinkage occurs in one direction. The advantages of heat shrinkable polyester film packaging are:
(1) Close-fitting and transparent, reflecting the product image.
② Tight packaging and good anti-scattering.
(3) Rain-proof, moisture-proof and mildew-proof. (4) It has no resilience and has certain anti-counterfeiting function.
Heat shrinkable polyester film is often used in convenience food, beverage market, electronic appliances and metal products, especially shrink label is its main application field. Because with the rapid development of PET beverage bottles, such as cola, sprite, all kinds of fruit juice and other beverage bottles need PET heat shrinkable film to match with them for heat sealing labels. They are polyester, environmentally friendly materials and easy to recycle.
Heat shrinkable polyester film is not only used as shrink label, but also used as the outer packaging of daily necessities. Because it can not only protect the packaged goods from impact, rain, moisture and rust, but also make the products win users with beautifully printed outer packaging, and also show the good image of the manufacturers. More and more packaging manufacturers use printed shrink film to replace the traditional transparent film. Because printing shrink film can improve the appearance grade of products, is conducive to product advertising, and can make trademark brands leave a deep impression on consumers.
General properties of pet heat shrinkable film:
Unitization: This is one of the biggest characteristics of shrink film packaging. Using the super-strong winding force and flexibility of the film, the product is tightly fixed and bound into a unit, so that the scattered small pieces become a whole. Even in unfavorable environment, the product will not be loose and separated, and there is no sharp edge and stickiness to avoid damage.
Primary protection: Primary protection provides the surface protection of the product, forming a light and protective appearance around the product, thus achieving the purposes of dust-proof, oil-proof, moisture-proof, water-proof and theft-proof. More importantly, film wrapping packaging can make the packaged goods uniformly stressed and avoid damage caused by uneven stress, which is impossible for traditional packaging methods (binding, packaging, tape packaging, etc.). ).
Compression fixity: the product is wrapped by the retraction force of the winding film after stretching, forming a compact unit whole without space, so that the product trays are tightly wrapped together, which can effectively prevent the product from dislocation and movement during transportation. At the same time, the adjustable stretching force can make hard products close to each other and make soft products close, especially in tobacco industry and textile industry.
Cost saving: The use of plastic wrap for product packaging can effectively reduce the use cost. The packaging film is only about 65,438+05% 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 and improve the packaging efficiency and packaging grade.