Tape Coating Machine Taiwan
It's be mainly used for bopp film gelatinizing producing，The tape is mainly used to seal the box, seal the cover and bind the articles, and can also be used as office supplies.
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.
Polyethylene (PE) film--
Medium Density Polyethylene (MDPE):
-- Its density is between 0.93 and 0.94 g/cm2 between high density and low density polyethylene.
High density polyethylene (HDPE):
- The density is between 0.94 and 0.965 g/cm2. The high-density polyethylene film has better heat resistance and mechanical strength than the low-density polyethylene film, and has a small tensile elongation, and the film thickness is generally 0.03 mm or more, but the transparency is poor. It is printed on the front side and is mainly used as a vest bag, a garbage bag and a liner bag.
Crosslinked polyethylene (CLPE):
- Because it has higher heat resistance, tensile strength, heat shrinkage and barrier properties than other polyethylene products, its use is further expanded, and it is currently mostly used as a heat shrinkable packaging film.
In general, as the density increases, the mechanical properties and barrier properties will increase accordingly, and heat and heat will be good. Polyethylenes of the same density have different properties due to the different film forming processes. This is because the rotting method can be rapidly cooled, the crystallinity is low, the transparency is high, the turbidity is small, but the molecular arrangement is more irregular, so the barrier property is small, that is, the transmittance is large, the elongation is low, and the tear resistance is Poor cracking.