PE polyethylene, which is a transparent thermoplastic. There are three major categories of PE commonly used, namely: LDPE HDPE LLDPE The monomers of the three polyethylenes are the same, but the process conditions used when synthesizing these polyethylenes are different. Therefore, three different polyethylenes are generated. Variety, the properties of the three materials are quite different.
PE film is a material with very good toughness and is not easy to be crushed with ordinary plastic crushers. Because the PE film is soft and tough, it is not easy to shred. What's more, the high temperature of the tool at high speed will cause the LDPE to melt and stick to the blade. PE granulation can be directly put into strips into the feeding port of the extruder, and the PE film is dragged into the barrel by the shear force of the screw, heated, melted, extruded and granulated. The first-grade material recycled from PE can still be blown into film and used for non-food and pharmaceutical packaging. It is also widely used in the production of Oxford leather and waterproof cloth. It has a bright future.
PE heat shrinkable film is widely used in the integrated packaging of alcohol, cans, mineral water, various beverages, cloth and other products. The product has good flexibility, impact resistance, and tear resistance. It has strong resistance to damage, is not afraid of moisture, and has a large shrinkage rate.
PVC shrink film, with added ingredients to enhance its heat resistance, toughness, ductility, etc. The top layer of this surface film is paint, the main component in the middle is polyvinyl chloride, and the bottom layer is back-coated adhesive. It is a synthetic material that is loved, popular and widely used in the world today. Among the materials that can produce three-dimensional surface films, PVC is the most suitable material.
Due to the unique properties of PVC (rainproof, fire-resistant, antistatic, easy to form) and the characteristics of low investment and high output of PVC, it is widely used in the building materials industry and packaging industry. Therefore, PVC film has transparency High, glossy, high shrinkage and other characteristics.
Parameters of PE heat shrinkable film
Detailed parameters of PE heat shrinkable film:
Width: single piece 0.2m~9m tear strength transverse direction: ≥40kn/ m
Tubular membrane 0.4m~4.2m Longitudinal: ≥40kn/m
Thickness: 0.015mm~0.35mm
Tensile strength: Transverse: ≥17mpa Longitudinal: ≥17mpa
Shrinkage: 15%~30% in transverse direction 50%~70% in longitudinal direction
Elongation at break: ≥350%
Shrinkage temperature : 120℃~180℃
Inner diameter of core: 76mm
Specific gravity: 0.925g/cm3
New Wrapsmart pre-stretched stretch film
"Wrapsmart pre-stretched stretch film is a new generation of green and environmentally friendly manual pre-stretched stretch film recently developed abroad. This product uses a new pre-stretching process to make the original film lighter and thinner, while its physical The tensile strength and wrapping force are basically unchanged, and no special packaging equipment is required, which is suitable for manual packaging, saving time, effort and money!
This new generation of green and environmentally friendly stretch film with a thickness of 0.007mm (7μm) product, but it can achieve the stability and protective performance of traditional 18~20μm film packaging. This product is a new technological product in China. Compared with traditional stretch film, it packs the same goods with less consumption and lower cost!
(1) Reduce atmospheric environmental pollution: Since the thickness of pre-stretched stretch film is significantly thinner, the amount used in packaging the same goods is also significantly reduced, resulting in a reduction in the total transportation volume, thereby reducing transportation energy consumption and Waste gas emissions are reduced, and the pollution to the atmospheric environment is reduced.
(2) Reduce the amount of waste processed
When packaging the same goods, the amount of pre-stretched stretch film is significantly reduced, so The amount of post-use recycling of stretch film has also been reduced by about 50%.
(3) Recycling: Green and environmentally friendly stretch film can be 100% recycled and granulated in the factory using general recycling equipment. Use. It can not only reduce environmental pollution, but also save recycling packaging costs.
(4) Reduce overall packaging costs: Using green environmentally friendly film to replace traditional stretch wrapping film significantly reduces the total amount used. , so its use cost, transportation cost and storage space cost have all dropped.
(5) Easy to use and high work efficiency: Because the green and environmentally friendly stretch film has been processed with pre-stretching technology, it is very easy to use. It is labor-saving, does not require a dedicated packaging machine and a dedicated packaging site, and can be operated by men, women, old and young.
Under the same weight, the length of each roll of this green and environmentally friendly stretch film is more than double that of ordinary stretch film. It can reduce the frequency of changing film rolls when packaging, and it is more convenient in terms of transportation, packaging and distribution. It can also save costs.
Advantages of pre-stretched stretch film over traditional stretch film
Cheap, high-quality, environmentally friendly and easy to use
Under the same weight, ultra-thin stretch film The actual packaging area is about 3 times that of traditional stretch film on the market. Compared with traditional stretch film, the cost savings are considerable. Moreover, our green environmentally friendly stretch film is a high-strength pre-stretched single-sided adhesive stretch film, which is very convenient to use, saving effort and money. The outer surface of the packaged object is not prone to dust and is clean and hygienic. OPS (heat shrinkable film) is a new type of skin-friendly packaging material that meets environmental protection requirements. OPS heat shrinkable film has high strength, rigidity, stable shape, and good gloss and transparency. It is easy to process, easy to color, has good printing performance, and has extremely high printing resolution. It is a complete material improvement for trademarks that are constantly pursuing exquisite printing. Due to the high shrinkage rate and strength of OPS film, it can closely fit various containers of different shapes, so it can not only print exquisite patterns, but also meet the use of various novel packaging containers with different shapes. This non-toxic, odorless, grease-resistant film that meets food hygiene standards allows designers to use eye-catching colors to achieve 360° label design, giving full play to creativity and imagination, so that beverages and other commodities can be used on labels. In use, the pattern is more vivid, highlighting the image on the shelf, creating an unexpected container effect.
OPS is a new type of body-printing packaging material that meets international environmental protection requirements.
1) OPS can achieve a lateral shrinkage rate of about 74%, and it is not easy to wrinkle during the shrinkage process. It can complete shrinkage in non-high temperature environment, so that the heat shrinkable label can be packaged tightly outside the container. After the label is shrunk in the transverse direction, there is almost no shortening of the label height due to longitudinal shrinkage in the longitudinal direction.
2) OPS has almost no crystallization points. Because OPS resin is different from PVC resin in the raw material refining process, it can greatly reduce the presence of crystal points and foreign matter.
3) OPS has a light proportion. The specific gravity of OPS is only 1.05. For the three materials of OPS, PVC, and PET with the same thickness and area, OPS can reduce the weight by 25%.
4) The tear line formed after the OPS label shrinks is very well-proportioned and easy to tear without destroying the overall effect of the label.
Heat shrink film is a small heat shrink packaging equipment carefully produced in accordance with international standards. It has the characteristics of easy operation, wide application range, good sealing, high transparency, low cost, and high grade. It is suitable for small and medium-sized batches of products. Package. The heat shrinkable film machine and the sleeve labeling machine are used online to form a sleeve labeling shrinking machine line, which is widely used in the fully enclosed heat shrink packaging of medicines, food, beverages, stationery, ceramics, daily chemicals, auto parts, knitting, electronic audio and video and other products. , is a sleeve label shrinking machine for downstream packaging lines. PET heat shrinkable film is a new type of heat shrinkable packaging material. Because it is easy to recycle, non-toxic, odorless, has good mechanical properties, and is especially environmentally friendly, polyester (PET) has become an ideal substitute for polyvinyl chloride (PVC) heat shrinkable film in developed countries.
However, ordinary polyester is a crystalline polymer, and ordinary PET film can only obtain a thermal shrinkage rate of less than 30% after special processing. To obtain a polyester film with a higher thermal shrinkage rate, modification must also be carried out. That is to say, in order to prepare a polyester film with a high thermal shrinkage rate, ordinary polyester, namely polyethylene terephthalate, needs to be polymodified. The maximum thermal shrinkage rate of polymer-modified PET film can be as high as more than 70%.
Characteristics of heat-shrinkable polyester film: It is stable at room temperature, shrinks when heated (above the glass transition temperature), and more than 70% of the thermal shrinkage occurs in one direction. The advantages of heat-shrinkable polyester film packaging are:
① It is transparent and body-hugging, reflecting the product image.
②Tightly tighten the packaging and have good anti-falling properties.
③Rainproof, moisture-proof and mildew-proof. ④No restorability and certain anti-counterfeiting function.
Heat-shrinkable polyester film is often used in convenience food, beverage markets, electronic appliances, and metal products. In particular, shrink labels are its main application areas.
Because with the rapid development of PET beverage bottles, beverage bottles such as Coke, Sprite, and various juices require PET heat shrinkable films to be used as heat seal labels. They are both polyesters, environmentally friendly materials, and easy to recycle. use.
In addition to being used as shrink labels, heat-shrinkable polyester film has also begun to be used in the outer packaging of daily commodities. Because it can not only protect packaged items from impact, rain, moisture, and rust, but also enable products to win users with beautifully printed outer packaging. At the same time, it can well demonstrate the good image of the manufacturer. More and more packaging manufacturers use printed shrink films to replace traditional transparent films. Because printed shrink film can improve the appearance of the product, is conducive to product advertising, and can make the trademark brand have a deep impression in the minds of consumers.
General properties of PET heat shrinkable film:
< p>Unitization: This is one of the biggest characteristics of shrink film packaging. With the film's super winding force and retractability, the products are compactly and firmly bundled into a unit, so that the scattered small parts become a whole. Even in unfavorable environments, the products do not have any looseness or separation, and are not sharp or sharp. edges and stickiness to avoid damage.Primary protection: Primary protection provides surface protection of the product, forming a very light, protective appearance around the product, thereby achieving the purpose of dustproof, oilproof, moistureproof, waterproof, and anti-theft. What is particularly important is that stretch film packaging allows the packaged items to be evenly stressed and avoids damage to the items caused by uneven stress. This is something that traditional packaging methods (bundling, packing, tape, etc.) cannot achieve.
Compression fixation: With the help of the retraction force of the stretch film, the product is wrapped and packaged to form a compact unit that does not take up space, so that the product pallets are tightly wrapped together, and can be It effectively prevents mutual dislocation and movement of products during transportation. At the same time, the adjustable tensile force can make hard products close and make soft products shrink. It has a unique packaging effect especially in the tobacco and textile industries.
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 shrink 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.