Professional tips: analysis of the difference between release paper and release film
xinstApr 09, 2020
Release film release paper, the difference between the two, there can be no small difference A variety of organic pressure-sensitive adhesives can exhibit extremely light and stable release force.
Different organic pressure-sensitive adhesives, such as hot-melt adhesives, acrylic adhesives, and pressure-sensitive adhesives in rubber systems, require different release forces for the release film. Needle isolation products have different viscosity and release characteristics. The force is adjusted accordingly to achieve a very light and stable release force during peeling.
The release film classification can be divided into different substrates: PE release film, PET release film, OPP release film, and composite release (that is, the substrate is composed of two or more materials) Wait.
Single-sided release film: HDPE (low-pressure polyethylene) release film, used for LDPE (high-pressure polyethylene) release film such as sealing tape and other waterproof rolls. BOPP (stretched polypropylene) release films for mechanical product packaging, hot-melt adhesive packaging, health care products (diapers), anti-corrosion coils, etc., used for PET (stretched polyester) release for sealing tape, silent tape, etc. Type membrane. Adhesive protection and other double-sided release films, red / green polyolefin (PE).
Double-sided release film: used for foam tape transparent PET double-sided release film; double-sided adhesive anti-sun light isolation film (HDPE silver coating film); waterproof coiled material sunscreen cooling enhanced BOPP reinforced aluminum substrate ( BOPET).
The release paper can be classified according to plastic release paper and non-plastic release paper; it can also be classified into silicone release paper and non-silicon release paper according to release agent. There is plastic release paper, because the release agent has a certain permeability, if there is no certain barrier, the release agent will penetrate into the paper, resulting in poor curing and the use of a large amount of release agent (too high cost) and many other defects factor.
Therefore, plastic coating (commonly known as coating) needs to be done on paper. Polyethylene (PE) particles are generally used for coating in China. The melt index is required to be around 7. Domestic PE particles generally use Yanshan Petrochemical 1C7A. Divided into single-plastic release paper and double-plastic release paper, non-plastic release paper, there are other special-treated release paper such as glassine, CCK and so on.
The release paper produced by laminating release paper base paper after laminating
Because there are paper wool and fibers on the surface of the paper, the film must reach a certain amount to ensure that there is no penetration point, that the silicone oil will not penetrate into the paper, and that there will be no peeling defects.
The film release paper is divided into single and double shower. Generally, single-sided release paper is single-leaf, of course, there are double-sided single-sided release paper, because the release surface is thicker, the film is generally 20 grams, and the non-release surface is generally thinner, 15 grams. smooth. If the coated paper is 22 grams on both sides, it is more suitable for double-sided release paper.
The film release paper is generally made of all wood pulp paper, especially in the electronics industry. If you choose straw pulp paper, there will be a lot of paper scraps and easy torn edges when die cutting. All wood pulp paper is generally called kraft paper, such as natural kraft paper (commonly known as: the cow), white kraft paper (commonly known as: white cow), yellow kraft paper (commonly known as: Japanese yellow color cattle), blue kraft paper (commonly known as: Indonesian blue color cattle).
Glassine release paper is coated with release agent after overpressure to produce release paper
Due to the super calendering, Grassin has a good paper tightness and is especially suitable for use in die-cutting factories. Since the domestic glassine can only produce a basis weight of 60 to 80 grams, the die-cutting factory prefers to use a basis weight of more than 100 grams, such as 120 grams and 140 grams. It has certain transparency, good stiffness and good die-cutting performance. All relied on imported base paper, but because the minimum amount of imported base paper is 20 tons per container, and must be booked 3 months in advance.