Pe Protective Film Coating Machine
bopp self adhesive packaging tape printing coating slitting machine producing clear & color & printed packing tapes.
BOPA film ---
BOPA is the abbreviation of Biaxially oriented polyamide (nylon) film. Biaxially stretched nylon film (BOPA) is an important material for the production of various composite packaging materials. It is now the third largest after BOPP and BOPET films. Packaging material. Also known as: NY.
Characteristics and main uses of BOPA film
Compared with other films, BOPA film has higher strength than PE and BOPP film. It has lower cost and environmental advantages than EVOH and PVDC film. It is an ideal material for food preservation and fragrance. It is especially suitable for freezing. It is cooked and vacuum packed, and it is non-toxic and harmless. Specifically in the following aspects:
(1) Good transparency and gloss, and low haze.
(2) Excellent toughness and puncture resistance.
(3) Excellent gas (oxygen, nitrogen, carbon dioxide), aroma and odor barrier.
(4) Excellent oil resistance, grease resistance and chemical solvent resistance.
(5) It is easy to process, can be coated, metallized, or compounded with other substrates.
(6) Wide temperature range (-60 ° C - 150 ° C).
(7) Strong heat resistance.
BOPA film ---
BOPA film manufacturing method
According to the different gravure printing methods of the production process, the manufacturing method of BOPA film can be divided into flat film method and tube film method, and the flat film method is mainly introduced here. At present, the production methods of flat film BOPA film are divided into two categories: two-step method and synchronous method. The synchronous biaxial stretching process is as follows: raw material drying→melt extrusion→cooling slab→casting thickness measurement→simultaneous biaxial stretching→heat setting→film thickness measurement→traction, trimming→winding→cutting→packaging Library. The two-step biaxial stretching process first performs longitudinal stretching and then transverse stretching, and the other processes are basically the same as the simultaneous biaxial stretching process. The two-step biaxial stretching technique has one of the biggest drawbacks: the bowing effect is large. This effect can result in a significant portion of the BOPA film product being produced that does not meet the very stringent requirements of the end user, such as high quality printed packaging. The synchronous biaxial stretching process can effectively improve the bowing effect problem, and the produced BOPA film has the characteristics of good quality balance and has a good market prospect.
The method of testing the bowing effect in the laboratory: determining the thermal shrinkage rate of the diagonal line, the smaller the difference between the two, the better the balance of the product; the difference is less than 1.5%, and the warp angle is not generated when the bag is formed.