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Comparison between heat shrinkable film packaging and stretch film packaging?

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each has his own advantages, which mainly depends on the needs of product packaging

the two packages are quite different. It depends on what products you pack
it depends on the nature of the package, packaging speed, etc.

characteristics of heat shrinkable film
is a good film packaging material, which has the following advantages:
(1) good transparency, allowing customers to directly see the packaged goods, which is convenient for customers to choose goods
(2) close to the shape of goods, it can be applied to the packaging of goods of various shapes, with a wide range of packaging contents
(3) excellent anti-theft and dust resistance
(4) a variety of commodities can be packed in a heat shrinkable bag to prevent the loss of individual small commodities, and it is also convenient for customers to carry
(5) heat shrinkable films with different mechanical strength and functions can be produced by selecting different resins and formulas. They can be used not only for inner packaging with low strength and small commodity weight, but also for transportation packaging (outer packaging) for mechanical products and building materials for containers with high strength requirements
protective performance of shrink packaging
brief introduction to protective performance of shrink packaging: shrink film is a thermoplastic film that is stretched and oriented in the production process and heated and shrunk in the use process. The heat shrinkability of film was applied as early as 1936. At first, rubber film was mainly used to shrink and package perishable food. Nowadays, heat shrinkable technology has been developed to almost package all kinds of goods with plastic shrinkable film. In addition, shrink packaging is also used to make shrink labels and shrink bottle caps, so that containers that are not easy to print or have complex shapes can be labeled. Recently, new application fields have been developed
production technology and features: thick films are usually produced by extrusion blow molding or extrusion tape casting, and then stretched longitudinally and transversely at a high elastic temperature above the softening temperature and below the melting temperature, or stretched and oriented in one direction and not in the other direction. The former is called biaxial tensile shrinkage film, The latter is called unidirectional contraction membrane. When in use, when it is greater than or close to the tensile temperature, the packaged goods can be wrapped with reliable shrinkage force
classification of heat shrinkable film
PE shrinkable film
PE polyethylene, which is a transparent thermoplastic. There are three types of PE commonly used, namely: LDPE, HDPE, LLDPE. The monomers of the three kinds of polyethylene are the same, but the process conditions used in the synthesis of these polyethylene are different. Therefore, three different polyethylene varieties are produced, and the properties of the three materials are quite different
PE film is a material with good toughness, which is not easy to be crushed by ordinary plastic crusher. Because the PE film is soft and tough, it is not easy to cut. Moreover, the high temperature of the tool at high speed will melt and adhere to the blade. PE granulation can be directly put into the feeding port of the extruder in strips, and the PE film is dragged into the barrel by the shear force of the screw to heat, melt and extrude granulation. PE recycled primary material can still be blown film, which can be used for non food and drug packaging. It is also widely used in the production of Oxford leather and waterproof cloth, and has a bright future
PE heat shrinkable film is widely used in the whole package of wine, cans, mineral water, various beverages, cloth and other products. The product has good flexibility, strong impact and tear resistance, not easy to damage, not afraid of moisture and high shrinkage
PVC shrink film
PVC PVC, with additional components to enhance its heat resistance, toughness, ductility, etc. The top layer of the surface film is lacquer, the main component in the middle is polyvinyl chloride, and the bottom layer is the back coating adhesive. It is a kind of synthetic material which is deeply loved, popular and widely used in the world. PVC is the most suitable material for producing three dimensional surface film. Br> due to the unique properties of PVC (rainproof, fire-resistant, antistatic and easy to form) and the characteristics of low input and high output of PVC, it is widely used in building materials industry and packaging industry. Therefore, PVC film has the characteristics of high transparency, good gloss and high shrinkage
POF shrinkable film
POF means heat shrinkable film. The full name of POF is multi-layer coextrusion polyolefin heat shrinkable film. It is made by plasticizing and extruding linear low-density polyethylene as the intermediate layer (LLDPE) and co polypropylene (PP) as the inner and outer layers through three extruders, and then processing through special processes such as die forming and film bubble expansion
POF is a kind of heat shrinkable film, which is mainly used for packaging products with regular and irregular shapes. Due to its non-toxic and environmental protection, high transparency, high shrinkage, good heat sealing performance, high gloss, strength and toughness, tear resistance, uniform heat shrinkage and suitable for automatic high-speed packaging, POF is a replacement product of traditional PVC heat shrinkable film, which is widely used in automotive products and plastic products, Stationery, books, electronics, circuit boards, MP3, VCD, handicrafts, photo frames and other wood products, toys, pesticides, daily necessities, food, cosmetics, canned drinks, dairy products, medicine, cassette and video tapes and other products
definition of stretch winding film
stretch winding film is a kind of packaging method that uses mechanical stretching device or manual force to stretch the film at room temperature to wrap the goods tightly for transportation and storage. It is a very popular packaging form in the world at present. Imported resin and advanced flow diffraction film extrusion technology are adopted. It has the characteristics of good tensile property, tear resistance, strong penetration resistance, high transparency, good self-adhesion, high retraction rate, tight packaging and no looseness. It can be widely used in single or pallet packaging and other binding packaging of chemical raw materials, chemical fertilizers, food, electromechanical products, light textile products, etc
types of stretch winding films
stretch winding films are divided into machine Wrapping series and hand wrapping series
A. thickness: 15mic-50mic
B. width: 5cm-150cm
C. stretch ratio (): 200% – 400%
D. color: transparent (other colors can be customized according to customer requirements)
application field of stretch winding film
the packaging of stretch film must be stretched, The stretching forms of pallet mechanical packaging include direct stretching and pre stretching. There are two kinds of pre stretching, one is roll pre stretching and the other is electric stretching
Direct stretching is to stretch between the tray and the winding film. This method has low tensile ratio (about 15% ~ 20%). If the tensile ratio exceeds 55% ~ 60%, which exceeds the original yield point of the film, the film width is reduced, the puncture performance is also lost, and the film is easy to break. And at 60% tensile rate, the tensile force is still large. For light goods, it is likely to deform the goods
pre stretching is done by two rollers. The two rollers pre stretched by the roller are connected by the gear unit. The stretching ratio can vary according to the gear ratio. The tension is generated by the rotary table. Because the stretching is generated in a short distance and the friction between the roller and the film is large, the film width does not shrink and the original puncture performance of the film is maintained. No stretching occurs during actual winding, which reduces the fracture caused by sharp edges or corners. This pre stretching can increase the stretching ratio to 110%
the stretching mechanism of electric pre stretching is the same as that of roller pre stretching, except that the two rollers are driven by electricity, and the stretching is completely independent of the rotation of the tray. Therefore, it has stronger adaptability. Light, heavy and irregular goods are applicable. Due to the low tension during packaging, the pre stretching ratio of this method is as high as 300%, which greatly saves materials and reduces costs. Suitable for film thickness of 15 ~ 24 μ m。
to sum up, the application fields of stretch film are very wide, but many domestic fields have not been involved, and many fields involved have not been widely used. With the expansion of application fields, the amount of stretch film will increase greatly, and its market potential is immeasurable. Therefore, it is necessary to vigorously promote the production and application of stretch film
advantages of stretch wound film
1 Compared with shrink packaging, stretch packaging saves raw materials, does not need heat shrink packaging machine, and saves energy
2. It has high strength and large elastic tension. It can wrap goods with any geometry tightly, and can avoid damage to goods caused by bundling.
it has good effects of preventing looseness, rain, dust and theft
3. High performance resins and auxiliary materials can be used to meet the needs of different users to the greatest extent
4. It can produce single-sided viscous products, reduce the noise during winding and stretching, and reduce dust and sand during transportation and storage
high quality stretch wound film features
● high transparency and good gloss
● rapid shrinkage at low temperature
● good sealing at high speed
● high shrinkage at low temperature, Suitable for small packaging in the field of food (special types of food)
● “one step” system and semi-automatic L-shaped shrinkage sealing roller table
● roller with diameter of 20cm is also suitable for small machines
● effective width: 200 ~ 800mm
● effective thickness: 18,20,30,40 μ M
PE winding film is an industrial film product with high tensile strength, high elongation, good self-adhesive and high transparency. It is used for manual winding film and machine winding film. It can be widely used in the centralized packaging of various goods
PE winding film is mainly made by mixing and extruding several different brands of polyoxyalkylene resins. It has puncture resistance, super strength and high performance. It winding and packaging the goods stacked on the supporting plate, making the packaging more stable and tidy and more super waterproof. It is widely used in foreign trade and export, papermaking, hardware, plastic chemical industry, building materials, food and pharmaceutical industries
PE stretch winding film: LLDPE stretch winding film is made of high-quality LLDPE as the base material, without adding high-quality tackifier, heated, extruded, cast, and then cooled by quench roller. It has the advantages of strong toughness, high elasticity, tear resistance, high viscosity, thin thickness, cold resistance, heat resistance, pressure resistance, dust prevention, waterproof, single-sided adhesion and double-sided adhesion. It can save materials It can save labor and time. It is widely used in papermaking, logistics, chemical industry, plastic raw materials, building materials, food, glass and so on
PE slitting and winding film: it is made of high-quality LLDPE as the base material, without high-quality tackifier, heated, extruded, cast, and then cooled by quench roll. It has the advantages of strong toughness, high elasticity, tear resistance, high viscosity, thin thickness, cold resistance, heat resistance, pressure resistance, dust prevention, water resistance, single-sided adhesion and double-sided adhesion. It can save materials, labor It saves time and is widely used in papermaking, logistics, chemical industry, plastic raw materials, building materials, food, glass and so on.

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