——The heat shrinkable film is used for the sale and transportation of various products, and its main function is to stabilize, cover and protect the product. The shrink film must have high puncture resistance, good shrinkage and certain shrinkage stress. The film does not create holes during shrinkage. Since the shrink film is often used outdoors, it is necessary to add a UV anti-UV agent. ——
Type of heat shrinkable film
PE shrink film
PE polyethylene, which is a transparent thermoplastic. There are three major types of PE commonly used, namely: LDPE, HDPE, LLDPE. The monomers of the three kinds of polyethylene are the same, except that the process conditions used in the synthesis of these polyethylenes are different, so three different types are generated. Polyethylene varieties, the performance of the three materials have a big difference.
The PE film is a very tough material that is not easily pulverized by a conventional plastic pulverizer. Because the PE film is soft and tough, it is not easy to shred, not to mention the high temperature of the tool at high speed, which will cause the LDPE to melt and adhere to the blade. The granulation of PE can be directly placed into the feeding port of the extruder, and the PE film is dragged into the barrel by the shearing force of the screw to heat, melt and extrude the granule. The first grade material recycled by PE is still blown film, used for non-food and pharmaceutical packaging, and is also widely used in the production of oxford leather and tarpaulin, with a bright future.
It is widely used in the whole collection packaging of wine, cans, mineral water, various beverages, cloth and other products. The product has good flexibility, strong impact resistance, tear resistance, not easy to break, not afraid of tide, shrinkage rate. Big.
PE heat shrinkable film detailed parameters:
Width: Single piece 0.2m~9m Tear strength Horizontal direction: ≥40kn/m
Tube film 0.4m~4.2m Longitudinal: ≥40kn/m
Thickness: 0.015mm~0.35mm
Tensile strength: transverse: ≥17mpa longitudinal: ≥17mpa
Shrinkage: horizontal 15%~30% vertical 50%~70%
Elongation at break: ≥350%
Shrinkage temperature: 120 ° C ~ 180 ° C
Core inside: 76mm
Specific gravity: 0.925g/cm3
PVC shrink film
The PVC shrink film is added with ingredients to enhance its heat resistance, toughness, and ductility. The uppermost layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the lowermost layer is a back-coated adhesive. It is a well-loved, popular and widely used synthetic material 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 (rain, fire, antistatic, easy to form) and PVC low input and high output, it is widely used in building materials industry and packaging industry. Therefore, PVC film has high transparency, good gloss and shrinkage. High rate and other characteristics.
POF shrink film
POF is a multi-layer coextrusion environmentally friendly polyolefin heat shrinkable packaging material. The membrane adopts a double-bubble process, and LLDPE is used as the middle layer material, and ternary copolymer polypropylene is used as the inner and outer layer materials, and is produced by three-layer co-extrusion compounding. POF has the characteristics of high transparency, high shrinkage, and good heat sealing performance. It has the advantages and advantages of PP film and PE film, so its product performance far exceeds that of pure PP film and PE film. It is currently on the international market. An environmentally-friendly heat shrinkable film packaging material that is widely used and approved by the European and American markets.
The main features of POF packaging film are:
1. High shrinkage rate;
2, gloss, high transparency, good product decoration performance;
3, good flexibility, low temperature is not embrittled, not easy to age;
4, low product density, can effectively reduce packaging costs;
5. The heat sealing performance is outstanding and the sealing strength is high;
6, tear resistance, good puncture resistance;
7, a wide range of use, can be used for semi-automatic, fully automatic high-speed packaging equipment and manual packaging;
8, the product meets FDA and USDA standards, non-toxic, environmentally friendly, can be used for packaging and production of various products such as food and medicine.
Available thickness: 10μ, 12μ, 15μ, 19μ, 25μ, 30μ, 38μ
Product performance of polyolefin heat shrinkable film
OPS shrink film
OPS (Heat Shrink Film) is a new type of body packaging material that meets environmental requirements. OPS heat shrinkable film has high strength, high rigidity, stable shape, and good gloss and transparency. It is easy to process, easy to color, good printing performance and high printing resolution. It is a material improvement for the trademarks that are constantly pursuing beautiful printing. Due to the high shrinkage and strength of the OPS film, it can be closely attached to various shapes of containers, so it can not only print beautiful patterns, but also meet the use of various novel packaging containers with different shapes. A non-toxic, tasteless, grease-resistant, food-sanitary film that allows designers to use eye-catching colors to achieve 360° label design, giving full play to creativity and imagination, allowing beverages and other products to be labeled The pattern in use is more vivid, highlighting the image on the shelf and creating an unexpected container effect.
OPS is a new type of body-printing grade packaging material that meets international environmental requirements.
1) OPS can achieve a lateral shrinkage of about 74%, and is not easy to wrinkle during shrinkage. The shrinkage can be completed in a non-high temperature environment, so that the heat shrinkable label can be packaged outside the container. After the shrinkage of the label is completed in the lateral direction, the longitudinal direction is hardly shortened due to the longitudinal contraction.
2) OPS hardly occurs at the crystal point. Since OPS resin is distinguished from PVC resin in the raw material refining process, the presence of crystal points and foreign matter can be greatly reduced.
3) The OPS is light in weight. OPS has a specific gravity of only 1.05. For three materials of the same thickness of OPS, PVC and PET, OPS can reduce the weight by 25%.
4) The tear line made after the OPS label is shrunk is very symmetrical and easy to tear without damaging the overall effect of the label.
The small shrink heat packaging equipment carefully prepared according to international standards has the characteristics of simple operation, wide application range, good sealing, high transparency, low cost and high grade. It is suitable for the packaging of small and medium batch products. The heat shrinkable film machine and the sleeve labeling machine are used together to form a sleeve shrinking machine line, which is widely used in the fully enclosed heat shrinkable packaging of medicines, foods, drinks, stationery, ceramics, daily chemicals, auto parts, needle spinning, electronic audio and video products. , is the sleeve shrinking machine of the downstream packaging line.
PET shrink film
PET heat shrinkable film is a new type of heat shrinkable packaging material. Due to its easy recycling, non-toxicity, odorlessness, good mechanical properties, and especially environmental protection, polyester (PET) has become an ideal substitute for polyvinyl chloride (PVC) heat shrinkable film.
However, the ordinary polyester is a crystalline high polymer, and the ordinary PET film can only obtain a heat shrinkage rate of 30% or less by a special process. To obtain a polyester film with a higher heat shrinkage rate, it must also be modified. That is, in order to prepare a polyester film having a high heat shrinkage ratio, it is necessary to copolymerize a common polyester, that is, polyethylene terephthalate. The copolymerized modified PET film has a maximum heat shrinkage rate of up to 70%.
The characteristics of the heat-shrinkable polyester film: it is stable at normal temperature, shrinks upon heating (above the glass transition temperature), and is more than 70% heat shrinkage in one direction.
The advantages of heat shrinkable polyester film packaging are:
1 The body is transparent, reflecting the image of the product.
2 tightly packed with good anti-scattering properties.
3 rain, moisture, mildew. 4 no recovery, there is a certain anti-counterfeiting function.
Heat shrinkable polyester film is often used in the convenience food, beverage market, electronic appliances, metal products, especially shrinkage labels are its main application areas. Because with the rapid development of PET beverage bottles, beverage bottles such as cola, sprite, and various juices require PET heat shrinkable film to be used as a heat seal label. They are all polyester-based, environmentally friendly materials, and easy to recycle. use.
In addition to being used as a shrink label, heat-shrinkable polyester film is also used in the outer packaging of daily-use goods. Because it can protect the packaged goods from impact, rain, moisture, rust, and the product can win the user with a beautifully printed outer packaging, and it can show the good image of the manufacturer. More and more packaging manufacturers use printed shrink film to replace traditional transparent film. Because the printing shrink film can improve the appearance of the product, which is conducive to the advertising of the product, which can make the brand of the brand deeply impressed in the hearts of consumers.
General properties of PET heat shrinkable film:
Unitization : This is one of the biggest features of shrink film packaging. With the superior winding force and retracting property of the film, the product is compactly and fixedly bundled into one unit, so that the scattered small pieces become a whole, and the product does not have any looseness and separation even under unfavorable environment, and there is no sharpness. The edges and stickiness are so as not to cause damage.
Primary protection : Primary protection provides surface protection of the product, forming a very light, protective appearance around the product to achieve dust, oil, moisture, water and security. It is especially important that the wrapping film package makes the packaged articles evenly stressed, and avoids damage caused by uneven force. This is not the case with traditional packaging methods (bundling, packaging, tape, etc.).
Compressive fixation : The product is wrapped by the retractive force of the stretched film to form a compact, space-saving unit, so that the trays of the product are tightly wrapped together, which can effectively prevent the products during transportation. The mutual misalignment and movement, while the adjustable tensile force can make the hard product close to each other, making the soft product tight, especially in the tobacco industry and the textile industry.
Cost-saving : The product packaging can be effectively reduced by using the wrapping film. The winding 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.
Heat shrink machine features
Heat shrink packaging machine
Directly heating PVC/POP shrink film with far-infrared radiation to achieve perfect shrink packaging, never affecting packaging, electronic stepless speed change, solid-state voltage regulator temperature control, stable and reliable, used in food, beverage, candy, stationery, Shrink packaging of hardware tools, daily necessities, chemical products, etc. Put the product on the shrink wrap film, seal it and then enter the shrink wrap machine, the product will automatically shrink.
Advantages of heat shrinkable label packaging
Heat shrink packaging
(1) Heat shrink packaging can package shaped products that are difficult to package in general, such as vegetables, meat, poultry, aquatic products, toys, gadgets, and small electronic products.
(2) The heat shrinkable film has high transparency, so the label has bright color and good gloss.
(3) The shrink film shrinks and sticks to the product, and the package is compact and can display the appearance of the product, and the packaged product is beautiful.
(4) The heat shrinkable film can provide a 360-degree all-round decoration to the packaging container, and can print product information such as product description on the label, so that the consumer can understand the performance of the product without opening the package.
(5) The shrink film has good wear resistance and high strength, ensuring the weight of the contents. The printing belongs to the film printing (the image is in the film sleeve), which can protect the imprint and the label has better wear resistance.
Prepress treatment of heat shrinkable film
Prepress processing
Good printability is obtained on the plastic film, the surface tension of the film should be higher than the surface tension of the ink, and the surface should have a certain roughness to form an adsorption force. In the plastic film, polyolefins such as PP and PE film are non-polar polymer materials, which have stable chemical properties, small surface tension, lower than the tension of the ink, and poor adhesion to the ink. However, although some films have surface tension and ink tension equivalent or higher, the surface is smooth, and the adsorption of the surface of the pore-free pores is small, and the opening agent, antistatic agent, and anti-aging agent added to the various resins in the synthetic resin are also Will affect the surface properties of the film, making its printability worse. Therefore, there are some printability problems in most shrink films currently used. Therefore, in order to improve the printability of the film surface, it is necessary to pretreat the surface of the film having poor printing performance to improve surface tension and surface adsorption. Commonly used methods include corona treatment plasma treatment, chemical treatment, coating treatment, and the like.
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