Release paper is also known as isolation paper, anti-stick paper, silicone oil paper. It is a kind of anti-adhesive paper that prevents prepregs from sticking and protects prepregs from contamination. Release paper is made of paper coated with anti-adhesive substances, and its type should be differentiated according to the material, thickness, elongation, single and double-sided differences.

Release paper on the base of the paper that is the base of the paper has high requirements, not only requires it to have a high strength and in the heat resistance of the pine thickness of moisture and other aspects also have strict requirements. It is understood that in the quantitative aspects of the raw paper is generally used more than 125g / m2 of paper, its production technology is difficult, the thickness of the raw paper and heat resistance control.

In the pine thickness of general selection of coniferous wood pulp and broadleaf wood pulp ratio copying way to control the heat resistance needs, add heat-resistant agent in the pulp to enhance the paper's heat-resistant properties. So the general release paper will use the film paper to make release paper, because of its good flatness, good toughness, in line with the basic requirements of the production of release paper.

Release coating layer can be divided into two categories, namely, silicone-based release coating layer and non-silicone-based release coating layer. Silicone-based release materials, including silicone resin and modified silicone resin with alkyd resin acrylic resin.

Non-silicone release materials include chromium complex methacrylic acid type or fatty acid type polypropylene resin, polymethylpentene resin and other special resins amino alkyd resins, epoxy resins and so on.

Different types of release coatings have different characteristics, such as silicone resin-type coatings with excellent peel performance and heat resistance, chrome complex-type coatings with poor solvent resistance, polypropylene-type coatings with high gloss but poor heat resistance.

Different types of release coatings and their technical processes are different, silicone-based release coatings are generally used roller or doctor blade coating method, and requires the raw paper used to be a layer of primer coating. Coating Online believes that the main purpose of the primer is to improve the smoothness and resistance to penetration of silicone-based coatings.

Polypropylene resin and polymethylpentene resin-type coating mainly through the extrusion coating method, which uses the raw paper can not be primed, the coating of the other added components through the extrusion coating machine feed slot feed, these release coating technology processes are involved in the control of the peel strength of the coating, which is also where the technical difficulties lie. Because this in turn involves the choice of peel strength control agent and its impact on the other properties of the release coating.

The production process of release paper is divided into four categories:

1, with the printing of the release paper, lamination paper, silicone oil paper must be printed before the latter process: lamination and silicone coating;

2, PE film (plastic coating), PE film machine, also known as plastic coating machine, will be hot melt PE plastic film evenly coated on the surface of the paper to form a film paper, also known as plastic coated paper or plastic paper. It is also the first process of producing plastic release paper;

3, silicone coating, silicone oil has the physical properties of non-affinity, silicone coating is the use of coating machine will be coated with silicone on the surface of other materials in rolls, forming a layer of silicone oil layer, called silicone oil paper (film), so as to achieve non-stick, oil, is the production of grease-proof paper, anti-adhesive paper, the main material of the release film;

4, slitting, because many companies have large silicone coated production line, and customer demand is generally narrower or a single sheet of finished products, so the last process is the large rolls of release paper (film) slitting into the finished product required by the customer. After slitting, the rolls of silicone coated paper, release film or laminating paper are then slit into rectangular sheets by a fluttering machine to meet the customers' needs for flat sheet products.

Application of Release Paper:

(1) Silicone oil paper: high temperature resistance, moisture-proof, oil-proof, generally used in food industry packaging;

(2) The role of ordinary release paper has moisture-proof, oil-proof, play a product isolation and so on. Applicable to electronics, coating, automotive foam, printing and other industries, etc., it is used in most of the scope of use and has a viscous in together, especially tape, so, generally to use the tape of the product will use the release paper;

(3) PVC wallpaper, PVC leather coated foam process to undertake the role.
Nanjing Suminoe Precision Machinery Co., Ltd. is committed to creating a high-quality release paper coating machine as follows.



Translated with DeepL.com (free version)