Abstract: Focusing on special paper and special papermaking blankets for special paper, the status quo of special papermaking blankets for special paper is analyzed, and the research and development direction of special papermaking blankets for special paper is mainly explained.
Keywords: special paper, special papermaking blanket for special paper, status quo, research and development.
In the past 20 years, China's paper industry has developed by leaps and bounds. Paper machines with the largest width and the highest speed for producing different types of paper in the world continue to emerge in China, resulting in China's paper industry equipment manufacturing technology, paper technology and paper products The quality level has been greatly improved, and at the same time, the quality and technology of the papermaking carpets matching the papermaking industry have also been greatly improved.
With the development of the paper industry, the degree of civilization of human society continues to increase, and people's requirements for the refinement of paper performance are constantly rising, and the variety of paper is also increasing. Therefore, the variety of paper blankets required for it is also diverse The function is also more refined, especially the special paper has higher requirements for papermaking blankets.
Let's first understand the special paper.
1. Special paper
Specialty Paper (Specialty Paper or Specialties) was not originally a paper name. It first refers to the small batch of products in the paper mill except for the main products, and then evolved into a synonym for specially made paper to meet customer ordering needs. Special paper is made from different fibers by using a paper machine to make paper with special properties. For example, synthetic fiber, synthetic fiber and plant fiber ratio or different plant fiber ratio and other raw materials are used alone, and modified or processed with different materials. Give different properties and uses of paper, such as: daily life, building materials, electrical products, industrial filters, machinery industry, agriculture, information, optics, culture and art, advanced biochemical technology, etc., as long as it is Paper materials used for special purposes are collectively called specialty paper.
1.1 Definition of special paper
The definition and interpretation of specialty paper in the paper industry are inconsistent. Some say "so-called special paper" is a type of paper that has certain special functions and is suitable for special applications; some say "special paper is: a variety of paper and paperboard with special properties for special purposes"; there are also Said: "Special paper is only used for specific purposes, and requires special paper paper." From this, it is difficult to make a clear and strict definition of special paper. (1)
1.2 Development process of special paper
Specialty paper (Specialty paper) was only gradually circulated after the 1960s. Some people call it special processing paper. The special paper originated from the carbon-free carbon paper developed by the National Cash Register Co. in 1945. Later, other special papers were continuously introduced, which opened up people's horizons and changed people's traditional views on paper. Raw materials are no longer limited to plant fibers, and non-plant fibers (such as inorganic fibers and synthetic fibers) have also been used. Structurally, in addition to the fiber interwoven layer, it can also process or increase the number of coating layers. In effect, it can be copied according to the design according to the needs, which was not thought in the past. However, the development of specialty papers faces many difficulties, such as large capital investment, high equipment requirements, and high technical difficulty. At the same time, many specialty papers have narrow application areas and low demand. In the short term, there is no major climate, which needs to be explored.
At present, the output of domestic specialty papers is very low, and there are few varieties, which is far from meeting the needs of the use of specialty papers in China. However, due to the wide application range of special paper, high performance and added value, the domestic small and medium-sized paper mills producing special paper lack the technical support of applied academic research units, making the development of special paper in China not fast. Special paper production enterprises should formulate development plans and move towards increasing varieties and technological progress. I believe that they will certainly open up a good space for the survival and development of the domestic special paper industry.
1.3 Characteristics of special paper
Special paper has the characteristics of "four new, three high, and dilemma". "Four new" means new raw materials (including plant fiber raw materials, animal fiber raw materials, mineral fiber raw materials and synthetic fiber raw materials, etc.), new processes, new equipment and new products. "Three high" is high technology, high performance, high efficiency (high value-added products). The "dilemma" is that it is difficult to control the processing process and to recycle and reuse. In addition, the specialty paper has the characteristics of "less, short and variable" in the market. "Less" means that specialty paper has a special purpose and the market is limited, so the output is small. "Short" means that the cycle is short and the market is easily saturated. "Change" means changing fast, maybe it becomes ordinary paper, or it may be upgraded, and it changes from time to time.
1.4 Types of special paper
There are many different methods for the classification of special paper. The following is divided according to the different uses of special paper:
1.4.1 Special cultural paper
Such as: carbonless copy base paper, special book printing paper, anti-leakage paper, audible paper, pressure paper, nano waterproof paper, security thread paper and anti-copy paper, etc.
1.4.2 Special packaging paper
Such as: stretch paper, deep stamping paper, paper grain bags, special food packaging paper (solar thermal insulation paper, far infrared packaging paper, edible preservative paper, dehydration function packaging paper, bean residue paper, fruit residue paper, special film packaging Paper, vegetable paper).
1.4.3 Daily Special Paper
Such as: clothing paper, water-soluble paper, vacuum cleaner bagging paper, colored paper rope paper, lampshade paper, cloth cloth paper, Japanese paper, textile material paper, etc.
1.4.4 Special paper for building materials
Such as: construction paper, composite floor wear-resistant layer paper, colored glazed cotton brick backing paper, steel paper, various new wallpapers (heating wallpaper, hygroscopic wallpaper, anti-mold propagation wallpaper, insecticidal wallpaper, taste-absorbing wallpaper, fire alarm wallpaper, Anti-eavesdropping wallpaper, high-frequency masking wallpaper, flame retardant paper), furniture paper and paper furniture, etc.
1.4.5 Special paper for healthcare
Such as: medical paper, oil-absorbing facial paper, dust-free paper, natural contraceptive test paper, disinfectant concentration test paper, deodorant paper, etc.
1.4.6 Special protective paper
Such as: anti-rust paper, refractory paper, etc.
1.4.7 Special paper for agriculture
Such as: weeding paper, seed germination determination paper, Chinese herbal medicine fruit and vegetable preservation paper, "four in one" agricultural paper mat, agricultural mulch paper, fruit bagging paper, shading paper, etc.
1.4.8 Special paper for the tobacco industry
Such as: high air permeability filter rod forming paper, tipping paper and tipping paper, cigarette paper, etc.
1.4.9 Other types of special paper
Such as: temperature measurement paper, heating paper, instrument gasket paper, soybean vegetable protein paper, foam paper, etc.
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