The difference between PE/PVC/POF heat shrinkable film

Heat shrinkable film is used in 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. There are many types of heat shrinkable film, which are used in various fields. The most important three types are PE/PVC/POF heat shrinkable film. What are the differences between the three?

PE heat shrink film PE polyethylene, which is a transparent thermoplastic. PE is commonly used in three categories, namely: LDPE HDPE LLDPE The three polyethylene monomers are the same, except that the process conditions used to synthesize these polyethylenes are different, so three different polyethylenes are produced. Variety, the performance of the three materials has a big difference. PE film is a very tough material, not easy to smash with ordinary 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. PE heat shrinkable film 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 be damaged, not afraid. The tide and shrinkage rate are large.

PVC heat shrinkable film PVC polyvinyl chloride, with added 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 heat shrinkable film POF is the meaning of heat shrinkable film. POF is a multi-layer co-extruded polyolefin heat shrinkable film. It uses linear low density polyethylene as the intermediate layer (LLDPE) and copolypropylene (pp) as the inner and outer layers. It is plasticized and extruded by three extruders, and then processed by special processes such as die forming and bubble inflation. POF is a heat shrinkable film mainly used for packaging regular and irregular shapes. Due to its non-toxic environmental protection, high transparency, high shrinkage, good heat sealing performance, high gloss, toughness, tear resistance, Uniform heat shrinkage and suitable for automatic high-speed packaging, it is a replacement of traditional PVC heat shrinkable film, widely used in automotive supplies, plastic products, stationery, books, electronics, circuit boards, MP3, VCD, crafts, photo frames, etc. Products, toys, pesticides, daily necessities, food, cosmetics, canned drinks, dairy products, medicine, cassettes and videotapes.

Industrial stretch film introduction

Stretch film is divided into hand stretch film and industrial stretch film. The stretch film manufacturer introduces the industrial stretch film. The industrial stretch film focuses on machine stretch film, just like PE stretch film. . Their hand stretched film differs from industrial stretch film in size.

Specifications: machine film width 500mm, manual film width 300mm, 350mm, 450mm, 500mm, thickness 15um-50um. Can be cut into various specifications online.

The applied industries are like packaging of goods pallets, such as electronics, building materials, chemicals, metal products, auto parts, wire and cable, daily necessities, food, paper and other industries.

PE industrial stretch film features: The product has good cushioning strength, good puncture and tear resistance, thin thickness and good performance and price ratio. It has high tensile strength, tear strength, transparency and good retraction force. The pre-stretching ratio is 400%. It can be assembled, waterproof, dustproof, anti-scatter and anti-theft.

Uses: PE industrial stretch film is used in pallet wrapping and other wrapping packaging, widely used in foreign trade export, bottle making, paper making, hardware and electrical appliances, plastics, chemicals, building materials, agricultural products, food and other industries.

Introduction to the processing of matting film

1-1 In order to obtain a uniform rough surface, that is, a matte surface, the thickness of the matte surface layer must be ensured, the minimum allowable thickness value is related to the die structure, the thickness distribution uniformity of the melt flow section in the die and the laminar flow of the multilayer material The state of the composite smoothness determines the uniformity of the thickness distribution of the matting material. In order to ensure that the matte layer completely covers the BOPP surface, the thickness of the matte surface layer is recommended as follows:

When the total thickness of the film is greater than 15 μm, the thickness of the surface layer is generally 2.3 to 2.6 μm;
When the total thickness of the film is 12~15μm, the thickness of the surface layer is ≥2μm.

1-2 The matte surface of the single-face matt film should be placed on the air knife surface instead of the chill roll surface. The temperature of the cooling roll and the water tank can be appropriately higher, such as about 30 °C.

1-3 Extrusion filter with 80 to 100 molybdenum, extrusion temperature is slightly higher than the general homopolymer PP 5~15 °C. For example, the feed section is 210 ° C, and the other sections are 245 ° C.

1-4 The longitudinal stretching ratio is about 4.8:1, and the longitudinal stretching temperature is similar to that of the random copolymer as the surface layer, such as a stretching zone of 125 ° C ± 5 ° C.

1-5 matt film formulations can be divided into three categories:

Packaging and compound packaging matte film:

Matting layer (air knife surface): matting masterbatch 100% 2.5μm
Core layer: HOPP 97%+ antistatic masterbatch 3% 13 ~ 15μm
Bright layer (adhesive roll surface): HOPP 98% + open masterbatch 2% 0.8μm
Corona treatment is generally in the bright layer (composite surface). The matte surface can also be corona treated if desired, but flame treatment is not possible. The surface resistance of the film must be less than 1012 Ω.

Invisible adhesive tape matte film:

Matting layer: matting masterbatch 100% 2μm
Core layer: HOPP 100% 24μm
Matting layer: matting masterbatch 100% 2μm
Single-sided corona treatment. In addition, the coated surface can also be made into a glossy surface.

Imitation paper film:

Matting layer: matting masterbatch 100% 2μm
Core layer: HOPP 70%+ pearlescent masterbatch 10%+ white masterbatch 20% 46μm
Matting layer: matting masterbatch 100% 2μm

In addition, when one of the matte surfaces is made into a glossy surface, a single-sided imitation paper film can be obtained.

The use and characteristics of matting film

1-1 The matte film looks like paper, giving a soft and luxurious feel. The purpose is as follows:

——Direct outer packaging and imitation paper use, including keeping a letter window, oily writing

——Combined with other materials, such as paper, aluminized film, light-shielding film, etc., used as daily necessities, clothing,

Packaging of cosmetics, small foods, etc.

——Use as adhesive tape substrate to make invisible adhesive tape

1-2 The matte surface layer is not only rough and uneven, the thickness is difficult to accurately characterize, and its mechanical strength is lower than that of the BOPP layer, so some manufacturers do not count the thickness of the layer into the film thickness.

1-3 The matting layer has good heat sealability, and has high heat seal strength and good hot tack.

1-4 The wear resistance of the matte film is worse than that of the bright film.

How does stretch stretch film change "waste" into treasure

       We all know that many products will try to tie them together before shipping. Although the rope can be done, it will not work during transportation. Instead of packing them with a stretch of stretch film, you can not only tie them. Together, it can also be dust-proof and moisture-proof to ensure that the product is not damaged.
                         
    Stretch film has excellent tensile strength, puncture resistance, tear resistance, high transparency, tight packaging and no looseness. It is widely used in chemical products, electronic product boxes, ceramic products, electromechanical equipment, paper products, etc. Bundling. Thanks to the superior winding force and retractability of the film, the product can be compactly fixed and bundled into one unit, providing excellent primary protection for the product. It can ensure the safety and stability of the product, and it can prevent dust and moisture and ensure the product is not damaged.

     The "predecessor" of this stretch film is waste plastic. Under the influence of advanced technology, the waste plastic is transformed into a wrap film. This film is different from traditional packaging materials and is entering the packaging market at an alarming rate. It is increasingly favored and widely used in the logistics and paper industry. Large pastoral herdsmen in the winter, as small as Mercedes-Benz, BMW car headlights, can see it.
                   
    Stretch-wrapped film is thinner and does not need to be glued, so it is simpler in the manufacturing process. However, in the face of piles of plastic waste, the stretch-wound film used for packaging is not only cost-effective but also A great packaging effect.

How to eliminate white spots on aluminized film?

The aluminized film is coated with a layer of metal on the basis of the bottom mold. It is a high-grade film product in the protective film industry. Its use is mainly for the packaging of advanced batteries and lenses, especially some need to be with water and For products that are isolated from air and sunlight, aluminized films are the first choice for their packaging.

    There are many white spots on the aluminized film, some of which are the reasons for the production process, and some are the reasons for not keeping it properly after production. In short, white spots cause great losses to the product itself, so how to eliminate these white spots , the knowledge required for both the manufacturer and the manufacturer.

    1. Different batches of inks increase the particle size detection index and strictly control, especially the size and particle size distribution of the full-bottom inks are not used outside the standard range; choose an excellent stable supplier.

    2. A special adhesive for aluminized film is used. The surface adhesive of the aluminized film composite adhesive has a low surface tension, and the coating spread effect on the surface of the aluminized layer is significantly superior to that of the general-purpose adhesive. The use of aluminized rubber makes it easy to control the leveling of the glue and has an ideal coating condition. From the adhesive coating state, the use of aluminum-plated glue can eliminate the possibility of white spots.

    3. The viscosity of the glue has a certain matching relationship with the number of the wire roller. If the matching interval is too large, the coating state of the glue will be destroyed, and the generation of "white spots" is more concerned.

    4, using aluminized film coating. The coating process usually adopted is a printing film (ink surface) coating, and a special coating method is adopted here to avoid the problem of uneven penetration of the ethyl layer on the ink layer, and avoid the problem of uneven penetration of the ink layer by the ethyl ester. At the same time, the applied adhesive can cover the surface of the aluminum layer sufficiently uniformly, so that the white point can be well eliminated. However, this process has its own limitations. First, it is limited to the composite of VMPET, while other aluminized films are subjected to heat in the oven and will be stretched and deformed under the action of tension. Secondly, a certain peel strength will be sacrificed. .

     5, flexible packaging companies must adhere to the regular cleaning system of coating rolls, master the correct coating roller cleaning method. When producing a full-white or light-bottom printing film, pay attention to two points. First, thoroughly clean the blade, coating roller, flattening roller, etc. before production.

    6. The adhesive should be thoroughly dried. Because the barrier property of aluminum plating is better, if the adhesion in the composite film is not completely dried, after the composite film enters the curing chamber, a large amount of residual solvent needs to be quickly released, and under the barrier of the aluminized film, a bubble is formed. . There may even be no white spots when the machine is off, and white spots appear after the aging.
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Different uses of CPP protective film in various industries

      CPP protective film has very important practicality in various industries. More and more industry packaging and engineering are focused on CPP protective film. CPP protective film has CPP matte protective film, CPP transparent protective film, CPP extinction protection. Membrane, CPP co-extruded composite film, etc., have different uses in various industries.

                          

    Use of CPP protective film in the medical industry: The production line is required to be installed in a sterile room to prevent the product from being contaminated by any form, and does not contain hygienic properties such as migration of harmful substances. After aluminum plating, it is combined with BOPP, PET, BOPA, etc. as a package for tablets or powder medicines; and is co-extruded with high-barrier materials such as EVOH to produce infusion bags, blood collection bags, and the like.

    CPP protective film for pesticide use: The special solvent is used to improve the solvent resistance, heat seal strength and impact strength of CPP film. It is applied to the packaging of pesticides such as emulsifiable concentrate. The usual flexible packaging structure is CPP/AL/BOPET. And CPP/PET aluminized/BOPET.

    CPP protective film and PE co-extruded composite film use: CPP film produced by modification can directly use LDPE and other film materials for extrusion compounding, which not only ensures the fastness of extrusion compounding, but also reduces the cost of compounding.

    Highly transparent and flexible film processed by using CPP protective film as a substrate: CPP protective film has high transparency and high impact resistance by using co-extrusion and blending technology, and has extremely soft hand feeling and excellent resistance. Puncture performance and low temperature resistance, mainly used for food packaging after frozen storage, also used in high-end clothing, T-shirts and underwear, and other heavy packaging.

    The CPP protective film can be processed into a biodegradable film, and its use: a CPP degradation film prepared by adding a degradation masterbatch to the PP, and being substantially degradable to inorganic matter by the soil under the natural conditions for about 7 months to 12 months. absorb. At present, some European companies have successfully developed such masterbatch, and some domestic cast film plants are testing.

Introduction to PET Aluminized Film

       PET aluminized film is widely used in beverages, pharmaceuticals, alcohol, cigarettes, cosmetics, food, gifts, and other packaging. It is the basic raw material for printing composite industry. PET aluminized film mainly produces high vacuum aluminum film (including color film). High vacuum aluminum-plated paper (including color aluminum-plated paper), anodized aluminum, aluminized non-woven fabric, cigarette liner paper, water-soluble coating for aluminum plating.

                   

       PET Aluminized Film Processing: A composite flexible packaging material is formed by vaporizing and vaporizing aluminum in a high vacuum state by high temperature to cause aluminum vapor to deposit and deposit aluminum vapor onto the surface of the plastic film. The aluminized film has excellent gas barrier properties, moisture barrier properties, light blocking properties and aroma retention properties, which can extend the shelf life of the contents. Because of its beautiful appearance, it can also replace aluminum foil to a certain extent, reducing the cost of packaging, and is often used in ordinary small food packaging, such as puffed food, biscuits, mustard and the like. It is also frequently used in high-end packaging such as medicine, tea, and milk powder.

Feature of polyethylene stretch film

The biggest feature of polyethylene stretch film is firstly unitized: unitization is one of the biggest features of polyethylene stretch film packaging. Primary protection: Primary protection provides surface protection of the product, forming light around the product and protecting the appearance to achieve dust, oil, moisture, water and anti-theft.

Cost saving: the use of PE stretch film packaging can effectively reduce the cost of use, the cost is only about 15% of the original box packaging, about 35% of the heat shrinkable film, about 50% of the carton packaging, and can reduce the labor intensity of workers. Improve packaging efficiency and packaging grade.

Compression fixation: The product is wrapped and packaged with the help of the shrinkage force of the PE stretch film to form a compact, space-free unit that allows the product tray to be tightly wrapped together. It can effectively prevent the product from being misaligned and moved during transportation. The adjustable tension can make the hard products close to each other, making the soft products firm, especially in the tobacco and textile industries, with unique packaging effects.

Different types of stretched film

Stretch film is divided into hand stretch film and industrial stretch film. The stretch film manufacturer introduces the industrial stretch film. The industrial stretch film focuses on machine stretch film, just like PE stretch film. . Their hand stretched film differs from industrial stretch film in size.

Specifications: machine film width 500mm, manual film width 300mm, 350mm, 450mm, 500mm, thickness 15um-50um. Can be cut into various specifications online.

The applied industries are like packaging of goods pallets, such as electronics, building materials, chemicals, metal products, auto parts, wire and cable, daily necessities, food, paper and other industries.

The development of stretch film in China

In the 1990s, stretch film was introduced to China from Europe and the United States. At the end of 1997, a plastic material company took the lead in introducing professional equipment from abroad and began to produce stretch film. The stretch film began to grow in China as a large-scale processing product.
As of the end of the 1990s, China's stretch film market was less than 20,000 tons, mainly concentrated in foreign companies in Guangdong and Shanghai, of which 50% of stretch film was imported from Australia and Italy. At the beginning of 2000, domestic self-made stretch film equipment gradually developed. The investment threshold of less than RMB 60,000 attracted many manufacturers into the field of stretch film production, and the production scale of stretch film expanded rapidly.


The film produced by the stretch film manufacturer casting method has high transparency and is not discussed here. As the number of C-atoms of the comonomer of the material increases, the length of the branch increases, the crystallinity decreases, and the effect of the "coiling or kinking" of the resulting copolymer increases, so the elongation is improved, and the puncture strength and the tear strength are also improved.

By 2005, the output of China's stretch film exceeded 140,000 tons, which formed a situation in which several large factories and many small factories coexisted. In the early stage of stretch film wholesale LLDPE stretch film is more than blown film, from single layer to two or three layers; LLDPE stretch film is mainly produced by casting method. Shenzhen stretch film is usually used with MPE and C4-LLDPE, but not all C4-LLDPE can be matched with it. The machine stretch film is mostly made of C6 and C8 materials, which is easy to process and can meet various packaging requirements. Handmade packaging uses C4 material due to its low draw ratio.

From the introduction of the 1990s to the current production scale, stretch film has occupied a certain market in the country and played an important role.

Analysis of the color change problem of stretched stretch film

Stretch film is a kind of packaging method that we often see in our life. It is of great value in food and medicine. It is known to everyone who stretches the film, but why is the color of it yellow? The following orientflex stretch film manufacturers tell you in detail.

In fact, strictly speaking, the stretched film is only colorless and color. The yellowish color is mainly caused by additives such as dov, color masterbatch or processing technology. If the color is light, the stretch rate and self-adhesiveness are not affected. If the color is not natural, the general quality will be very poor.

Stretched film development to today's production process is very mature, some stretch film manufacturers will try to change the formula to produce different properties of stretch film, mainly reflected in three aspects: color, stretch and self-adhesive, single color The change does not necessarily affect the use of the stretched film. It is known that many times the melt temperature of the process is set to cause a change in the color of the stretched film, but it does not affect the transparency. This is a good stretch film if stretched. The rate and self-adhesive properties are degraded, which is a poor stretch film, which may be mixed with impurities.

If the color of the stretched film is light yellow, but the transparency, stretch rate, self-adhesiveness have not changed, and there is no odor, it can be used. If the four indicators change, do not use it again.

Introduction to the advantages of pe stretch film

The biggest advantage of PE stretch film is that the protected product is not polluted, corroded, scratched and protected from the original smooth and shiny surface during production, processing, transportation, storage and use, thus improving product quality and market competition. force. The PE stretching film is suitable for the following industries:

The PE stretching film is suitable for the following industries:

1. Hardware industry;

2. Photovoltaic industry;

3. Plastic industry;

4. Printing industry;

5. Wire and cable industry;

6. Electronic industry;

7. Logistics industry;

PE stretch film has the advantages of good tensile properties, strong retraction force, high transparency, good puncture resistance and self-adhesiveness. It can keep the articles close together and prevent scattering, which is conducive to safety during transportation. The use of PE stretch film is not prone to scratches and bumps, beautiful and firm.

PE Coated Spunlace

Product Specification:

width 5cm-200cm
Weight: 20g/sm--250g/sm

Composition: 100% Polypropylene, PE, airlaid paper

Product Features:
Good water absorb function, Good water absorb rate,Soft hand feeling  

Product  Application:
Medicial treatment sanitation and lab our protective products, Such as Surgical Drapes, Surgical Wraps . 

Product  Packing:

Rolls packing,inner is plastic bag,outside packing by woven bag.And we can packing with customers' require.

PE Coated Viscose

Product Specification:
        width 5cm-200cm
        Weight: 20g/sm--250g/sm

        Composition: 100% Polypropylene, PE, airlaid paper  

    

 

Product Features:
      Good water absorb function, Good water absorb rate , soft hand feeling 

Product  Application:
      Surgical Drapes,Surgical Wraps

Product  Packing:

    
Rolls packing,inner is plastic bag,outside packing by woven bag.And we can packing with customers' require.

Hot Melt Glue Lamination

           Product Description: 
           Product  Name: Breathable PE Film Laminated PP With Glue 
           Product Specification:
           width 5cm-200cm.
           Product Features:
            Top-Grade Medical PE Film, Puncture Resistance 
           Product Application:
             Surgical Drapes, Surgical Wraps

                Product Packing:

Rolls packing, inner is a plastic bag, outside packing by the woven bag. And we can pack with customers' require.

Medical Anti-slip film

  

Characteristics Medical Anti-slip film:
TPE material is coated on the non-woven fabric, the material has a higher viscosity, friction resistance on the smooth surface can be used in the manufacture of disposable shoes, the smooth surface has higher requirements for better antiskid effect health environment. For medical, disposable consumer goods and other industries.

        

                    

Product Show:

PE Unbreathable Film

Description:

       Non-Breathable PE Film is one of the raw materials for diaper and sanitary napkin.It is mainly used for the film and the packing of the sanitary napkins and diapers .Can also be used for diapers and disposable pads and so on.

       There are some advantages are as follows: precise contraposition, excellent printing&physical  performance ,rich and colorful, environment, friendly, odorless, Non-toxic, without VOC, no benzene residue, soft and comfortable.

         

Features:

  1. Excellent water proof performance

  2. Best physical function

  3. Non-toxic, tasteless and harmless to human

  4. Excellent printing performance

   5. Soft and silk hand feeling

 
  

Product  Application

   

Product Process

Product Packing 

        

Rolls packing,inner is plastic bag,outside packing by woven bag.And we can packing with customers' require.