What is Specialty Paper and Specialty Paper Felt?

Specialty paper is a type of paper and paperboard with special properties that are suitable for specific purposes.

Types of specialty paper

1） Cultural specialty paper:

For example: carbonless copy base paper, special book printing paper, leak proof paper, sound producing paper, pressure resistant paper, nano waterproof paper, safety thread paper, and anti copying paper, etc.

2） Packaging specialty paper:

For example: stretch paper, deep stamping paper, paper grain bags, special food packaging paper (solar insulation paper, far-infrared packaging paper, edible anti-corrosion paper, dehydration function packaging paper, soybean residue paper, fruit residue paper, special laminated packaging paper, vegetable paper).

3） Specialty paper for daily use:

Such as clothing paper, water-soluble paper, vacuum cleaner bag paper, colored paper rope paper, lampshade paper, cloth paper, toilet paper, textile material paper, etc.

4） Special paper for building materials:

For example, architectural paper, wear-resistant layer paper for composite flooring, colored glazed tile lining paper, paper steel, various new wallpapers (heating wallpaper, moisture absorbing wallpaper, anti mold breeding wallpaper, insecticide wallpaper, odor absorbing wallpaper, fire alarm wallpaper, anti eavesdropping wallpaper, high-frequency shielding wallpaper, non combustible paper), furniture paper and paper furniture, etc.

5） Medical and healthcare specialty paper:

Such as medical paper, oil absorbing face paper, dust-free paper, natural contraceptive test paper, disinfectant concentration testing paper, deodorizing paper, etc.

6） Protective special paper:

For example: rust proof paper, fire-resistant paper, etc.

7） Agricultural specialty paper:

For example: grass cultivation paper, seed germination testing paper, Chinese herbal fruit and vegetable preservation paper, "four in one" agricultural paper mat, agricultural paper mulching film, fruit bagging paper, shading paper, etc.

8） Special paper for tobacco industry:

Such as high air permeability filter rod forming paper, water pine paper and water pine base paper, cigarette paper, etc.

9） Other types of specialty paper:

Such as: temperature measuring paper, heating paper, instrument washer paper, special paper made of soybean vegetable protein, foam paper, etc.

Different specialty papers have different requirements for paper making felt:

Different specialty papers have different paper properties and special uses, so there are different performance requirements for the corresponding paper making felt. Only by understanding the special requirements for felt can qualified felt be produced with targeted measures.

1) Prevent hair removal and shedding. Some special papers that need to be printed, such as wood grain base paper, water pine base paper, etc., have strict requirements for the removal and shedding of batt from felt. Otherwise, the "batt" that falls off the felt will adhere to the surface of the paper sheet, which can easily lead to "missing printing" and "pasting" problems; At the same time, as the "batt" falling off the felt accumulate more and more in the surface adhesive solution, these fine batt are easily adhered to the surface of the paper with the adhesive solution; The paper type that needs to be coated on the surface is prone to linear coating "scratches" on the paper surface due to the fine batt falling off the felt, which are easily trapped between the coating blade and the paper sheet.

2) No felt marks are produced. The vast majority of special paper requires no felt marks, especially some paper containing anti-counterfeiting watermarks. If there are felt marks, it will greatly affect the clarity of the anti-counterfeiting watermark, and unnecessary felt marks will also seriously affect the appearance of the paper.

3) There are felt marks produced. Some papers, such as sketch paper and craft packaging paper, require clear, natural, and beautiful strip-shaped marks on the paper surface, and these marks are mostly produced by striped felts. The mechanically pressed patterns are stiff, too regular, and lack aesthetic appeal, and cannot compare to the patterns produced by striped felts.

4) The surface of the felts is flat and delicate. This is also the basic requirement of the vast majority of special paper for felts. If the felt surface is too rough, it will inevitably lead to unevenness on the paper surface. Of course, there are some paper types that require a rougher surface, which in turn requires a rougher surface for the felt.

5) Filter performance and air permeability settings. This performance is crucial for paper making felts. Some special papers, such as tracing paper, have a high degree of tapping, making it difficult for the pulp to filter water. However, some paper types, such as tea bag paper and filter paper, have a low degree of tapping, making the pulp filter water quickly. All of these require paper making felts that are matched with them to have suitable water filtration performance, water retention performance, and anti rewetting performance.

6) Acid resistance requirements. Some specialty papers are made under acidic conditions, which requires felts to have acid resistant oxidation properties. We need to use some acid resistant raw materials to produce felts.