About BOPP cigarette film and drug packaging film
一、BOPP cigarette coating
As a transparent plastic film for cigarette outer surface packaging, the cigarette industry has used a variety of materials, including cellophane, PVC coating film, PVDC coating film, BOPP cigarette film, etc. BOPP cigarette film has unparalleled characteristics of other materials because of its comprehensive good optical properties, wide heat sealing range, high heat sealing strength, excellent water vapor barrier ability, uniform thickness, wide shrinkage control range, good stiffness, etc., making it the preferred material for cigarette packaging.
BOPP smoke film, also known as 'biaxially oriented polypropylene smoke film', is co extruded and stretched by a variety of polypropylene functional materials. This product has high transparency and luster, non-toxic material, stable molecular structure, and certain barrier function to odor and moisture, so it is an ideal material for cigarette packaging.
classification | characteristic |
BOPP ordinary smoke film | With excellent smoothness, low shrinkage and good barrier property, it is suitable for high-speed and low-speed cigarette packaging machines, and is generally used in soft box packaging. |
BOPP low shrinkage smoke film | With excellent smoothness, high shrinkage and good barrier property, it is suitable for high-speed and low-speed cigarette packaging machines, used in soft and hard box packaging. |
BOPP high shrinkage smoke film |
1. Anti wrinkle universal smoke film: It has good smoothness, high shrinkage (with body fitting packaging effect), good ink resistance and good stiffness. It is suitable for medium and low-speed cigarette packaging machines and used in hard box packaging.
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2. High gloss shrink smoke film: It has good smoothness, high shrinkage (with body fitting packaging effect), good ink resistance, good gloss and good stiffness. It is suitable for high-speed and low-speed cigarette packaging machines and high-end hard box packaging.
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3. Anti counterfeit printing smoke film: It has good smoothness, high shrinkage (with body fitting packaging effect), good ink resistance, good surface tension and good stiffness. It is suitable for high, medium and low-speed cigarette film machines, and is used on hard box bags and strip bags that need anti-counterfeiting. |
4. Wear resistant smoke film: It has good smoothness, high shrinkage (with body fitting packaging effect), good ink resistance and few precipitates. Its surface has high hardness. It is suitable for high, medium and low-speed cigarette packaging machines and used in high-grade hard box bags and strip bags. |
The physical and mechanical properties of BOPP smoke film and the processing quality of products have a great impact on its use in the production process. Compared with ordinary BOPP film, its main requirements are: high transparency and gloss, excellent heat sealing strength, high water vapor barrier performance, suitable for high-speed packaging. The physical and mechanical properties of BOPP smoke film can be verified in the following aspects:
index | requirement |
Thickness | The basic index for laboratory testing of film properties. However, the thickness will affect the tensile strength and barrier properties of the smoke film, and will also affect the subsequent processing of the smoke film. |
Friction coefficient | The smoothness of BOPP smoke film is an important index in the comprehensive index, and it is the detection demand generated by the high-speed packaging. In the cigarette packaging process and the whole production process, there are four kinds of friction coefficient tests: ① the friction coefficient between the outside of the film and the mechanical metal surface or the conveyor belt ② the inside and inside of the film, ③ the inside and outside of the film ④ the outside of the film and the carton. |
Heat sealing performance | The cigarette industry requires BOPP film to have high heat sealing strength and wide heat sealing range, so as to improve the packaging speed and operation adaptability. Of course, if the heat sealing temperature of BOPP smoke film is high, there will be wrinkles caused by the large shrinkage of the smoke film. Therefore, the appropriate heat sealing temperature should be selected according to the actual situation to avoid the phenomena of loose heat sealing, flying bags, wrinkles and so on. |
Thermal shrinkage | It is mainly used to evaluate the dimensional thermal stability of BOPP smoke film under different conditions or factors. |
Antistatic property | Antistatic performance is one of the basic conditions to ensure the smooth operation of the packaging machine in the cigarette packaging process. |
Stiffness | Stiffness is a quantitative index that indicates the stiffness of smoke film. When the stiffness of smoke film is high, high folding quality can be obtained in the packaging and molding process, and the adverse effects of static electricity on the cutting, conveying and folding process of smoke film can be overcome, which is conducive to reducing the running faults of smoke film on the machine. |
Haze | Higher transparency and gloss are the eternal requirements of the market for BOPP film to match the cigarette bag to show a better appearance effect. Haze and glossiness are two main indexes reflecting the optical properties of thin films. Haze is usually referred to as transparency. The lower the haze value, the higher the transparency of the film, which makes the trademark pattern of the cigarette bag clearer and more beautiful. The film with low haze will make the appearance of cigarettes more high-end, thus improving consumers' desire to buy. |
The commonly used cigarette film thickness is generally about 21mic, and the commonly used models are 'medium harvest' and 'medium high harvest',
Note: medium and high income refer to the index of thermal shrinkage.
二、 BOPP drug packaging film
BOPP drug packaging film is basically the same as BOPP cigarette packaging film. The difference is that the drug packaging film generally uses 'micro collection'.