Characteristics and applications of the hottest bi

2022-08-08
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Characteristics and application of biaxially stretched film materials

biaxially stretched film has excellent properties and is widely used in the packaging industry. It is expected that biaxially oriented films will maintain a rapid development rate this year. However, biaxial tensile materials with different substrates have their own characteristics, which need special attention when selecting

biaxial stretching technology is a film processing technology that began to realize industrialization in the 1970s. Biaxially stretched film has developed rapidly in the past decade and has become the main packaging material for various high-performance packaging films. BOPP and BOPET are the mainstream of biaxially oriented films widely used in the market at present. BOPA and BOPS have also developed in recent years and become an important part of the application of biaxially oriented films

BOPP film

BOPP film is a very important flexible packaging material, which is widely used. BOPP film is colorless, odorless, tasteless, non-toxic, and has high tensile strength, impact strength, rigidity, strong toughness and good transparency. The surface energy of BOPP film is low, and corona treatment is required before gluing or printing. However, after corona treatment, BOPP film has good printing adaptability, and can get beautiful appearance effect by chromatic printing, so it is often used as the surface material of composite film. BOPP film also has shortcomings, such as easy to accumulate static electricity, no heat sealing, etc. In the high-speed production line, BOPP film is easy to generate static electricity, so it is necessary to install an electrostatic remover. In order to obtain heat sealable BOPP, when the particle size of the material enters the nano range, the film can be coated with heat sealable resin glue liquid after corona treatment on the surface of BOPP film, such as PVDC latex, EVA latex, etc., or solvent glue. The heat sealable BOPP film can also be produced by extrusion coating or coextrusion composite method. The film is widely used in the packaging of bread, clothes, shoes and socks, as well as the cover packaging of cigarettes and books. The induced tear strength of BOPP film is increased after stretching, but the secondary tear strength is very low. Therefore, no incision can be left on both sides of BOPP film, otherwise the BOPP film is easy to tear during printing and compounding. After BOPP is coated with self-adhesive, it can produce sealing tape, which is a market with a large amount of BOPP

BOPP film can be produced by tube film method or flat film method. The properties of BOPP films obtained by different processing methods are also different. The BOPP film produced by the flat film method has higher strength and better uniformity of film thickness than that produced by the tube film method because of its large tensile ratio (up to)

in order to obtain better comprehensive performance, multi-layer composite method is usually used in the process of use. BOPP can be compounded with a variety of different materials to meet special application needs. For example, BOPP can be compounded with LDPE (CPP), PE, Pt, Po, PVA, etc. to obtain high gas resistance, moisture resistance, transparency, high and low temperature resistance, cooking resistance and oil resistance. Different composite films can be applied to the packaging of oily food, delicacies, dry food, impregnated food, all kinds of cooked food, monosodium glutamate, pancakes, rice cakes and so on

bopet film

bopet film is biaxially stretched polyester film. BOPET film has the characteristics of high strength, good rigidity, transparency and high gloss; Odorless, tasteless, colorless, non-toxic, outstanding strength and toughness; Its tensile strength is 3 times that of PC film and nylon film, and its impact strength is times that of BOPP film. It has excellent wear resistance, folding resistance, pinhole resistance and tear resistance; The heat shrinkability is very small. At 120 ° C, it shrinks only 1.25% after 15 minutes; It has good antistatic property, is easy to vacuum aluminize, and can be coated with PVDC, so as to improve its heat sealing property, barrier property and printing adhesion; BOPET also has good heat resistance, excellent cooking resistance, low temperature freezing resistance, good oil resistance and chemical resistance

bopet film can not be dissolved by most chemicals except nitrobenzene, chloroform and benzyl alcohol. However, BOPET will be eroded by strong alkali, which should be paid attention to when using. BOPET film has low water absorption and good water resistance, which is suitable for packaging foods with high water content

BOPA film

BOPA film, namely biaxially stretched nylon film, is an important surface material for the production of various vacuum packaging and other composite packaging materials. In order to ensure that nylon film has good barrier property and prevent nylon from hygroscopic due to strong hydrophilicity, resulting in reduced barrier property, multi-layer composite process is usually used, and BOPA film is placed in the middle layer of the composite film as a barrier layer

BOPA film is a colorless, odorless, tasteless and non-toxic packaging material with excellent transparency. It has good strength and barrier property, and can be used for vacuum packaging of sausage and other foods; It has good high and low temperature resistance, and the service temperature is between -60 ° C and ° C for advanced chemical materials; In addition, BOPA film also has excellent oil resistance, organic solvent resistance, alkali resistance, drug resistance, etc; At the same time, BOPA film is not easy to generate static electricity, does not absorb dust, and has excellent vacuum printability, which is easy to vacuum aluminize. Cast nylon sheet has good extensibility and can be used for vacuum thermoforming

due to the strong hydrophilicity of nylon film, the moisture resistance of nylon film used alone is poor, and the barrier property will be reduced after moisture absorption. Therefore, once BOPA film is produced, it should be tightly wrapped with aluminum foil immediately to prevent it from moisture absorption. When using, try to use up the whole roll of film at one time. If it cannot be used up, it should be tightly wrapped with aluminum foil and stored in a dry place. As for the hygroscopic nylon film, it needs to be dried again before printing and compounding, otherwise there will be glue leakage, printing leakage and other faults

after BOPA film is compounded with different materials, it can get better heat resistance, strength and toughness, pinhole resistance, oil resistance, gas resistance, etc. it is widely used in the packaging of all kinds of cooked food, hamburgers, meatballs, cooking meals, all kinds of meat, dairy products, sausage, soy sauce, pickles, aquatic products, general food, wine, rice cakes, cakes, rice, etc., and is widely used

bops film

unmodified PS film is hard and brittle, and has little use value. The toughness and brittleness of PS films can be improved by biaxial stretching. BOPS film is also odorless, tasteless, colorless, non-toxic and other characteristics, @8. Whether the operation at all speeds is uniform@ 9. Whether the operation of each speed is normal; At the same time, it has particularly excellent elongation, so it can be widely used in hot forming processing

BOPS films processed under different conditions have different properties. Random PS particles can be produced by tube film method or flat film method. BOPS films and sheets are usually extruded at a temperature of about 200 ° C in domestic materials. After extrusion, it does not need to be quenched, and it is directly cooled to ° C for vertical and horizontal stretching. The temperature should always be kept above 80 ° C during stretching. For isotactic PS particles, they should be extruded at 290 ° C, stretched vertically and horizontally at ° C, then maintained the tension during stretching, heat set at ° C, and get BOPS film after cooling

BOPS sheet is mainly used for thermoforming various cups, plates, plates, fast food boxes, medicine and other packaging products, and its service temperature is -40 ° c-95 ° C. As PS sheet for thermoforming, its thickness is generally more than 0.1mm. PS film after biaxial stretching can be used as heat shrinkable film without heat setting process. The maximum shrinkage rate can reach 45%-55%, and the shrinkage temperature is ° C. It has good transparency and gloss, and it can also be easily sealed with adhesive. In addition, BOPS film is often used in the window of carton packaging and light food packaging

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