How is paper produced?

How is paper produced?

Paper is produced in two forms, mechanism and handmade. Mechanism is carried out continuously on the paper machine, the pulp suitable for the quality of the paper, diluted with water to a certain concentration, in the net part of the paper machine initial dewatering, the formation of wet paper, and then press dewatering, and then drying into paper. Handmade with bamboo curtains, polyester mesh or copper mesh frame, will be dispersed in the water suspension of fibers copied into wet paper, dehydrated by the press, and then sun-dried or dried into paper.

The modern papermaking program

can be divided into the main steps of pulping, modulation, copying, processing and so on.

1, the process of pulping Pulping for the first step of papermaking, generally the wood into pulp method of mechanical pulping, chemical pulping and semi-chemical pulping method and so on three.

2, modulation process The modulation of paper for the other focus of papermaking, paper after the completion of the strength, color, printability of the advantages and disadvantages of the paper storage period is directly related to it.

Generally common modulation process can be roughly divided into the following three steps: a. scattered pulp b. pulping c. plus glue and filling

3, copying process The main work of the paper copying department is to thin the paper, so that it is uniformly intertwined and dewatering, and then drying, calendering, rolling, cutting, selection, packaging, so the general common process is as follows:

a. Screening of the paper material. The modulated paper is diluted into a lower concentration, and through the screening device, again sieve out debris and undissociated fiber bundles to maintain quality and protection devices.

b. Screen section. Make the paper material from the head box out of the copper wire mesh or plastic mesh in the loop and evenly distributed and interwoven.

c. Press section. The net surface will be removed from the wet paper led to a cloth with two rolls between, through the rolls of the extrusion and the role of the cloth of the absorbent, the wet paper for further dehydration, and make the paper more compact, in order to improve the surface of the paper to increase the strength.

d. Calendering. Because after pressing the wet paper, its moisture content is still as high as 52 - 70%, at this time has been unable to use mechanical force to press the water, so instead of letting the wet paper through a number of internal hot steam cylinder surface to make the paper dry.

e, rolled paper. Because after pressing the wet paper, its moisture content is still as high as 52 - 70%, at this time can no longer use mechanical force to remove water, so instead of letting the wet paper through a number of internal hot steam cylinder surface to make the paper dry.

f, cutting, selection, packaging: take the front has been rolled into a tube of paper rolls, with the paper cutter cut into a sheet of paper, and then manually or mechanically selected, remove the damaged or stained paper, and finally every five hundred packages into a packet (usually called an order).

How toilet paper is produced

There are strict hygiene standards for toilet paper and napkins, and the former is much lower than the latter. Therefore, experts caution against taking toilet paper as a napkin, because toilet paper contains fluorescent substances and fungi may be more, napkins can be present fungi, just as some foods contain traces of pesticides, there is no need to deliberately exclude. However, it is worrying that some napkins, toilet paper in the number of mold is 60% over the standard. Experts believe that excessive mold is a potential threat to the human body, because mold is less sensitive to general drugs or compounds, and the harm to the human body is heavier, difficult to cure, and even a case of a few years old, a little girl somehow got gynecological disease, after investigation, unclean toilet paper is the culprit. These poor-quality toilet paper made of poor-quality recycled paper, very unfavorable to human health. From a health point of view, only with pure wood pulp this uncontaminated natural pulp made of toilet paper and napkins is harmless to health Using toilet paper manufacturing device. Paper is an indispensable item in people's daily life, its demand is very large, with the improvement of people's living standards, paper and paper products are widely used. Therefore, papermaking is an industry that can be developed in the long term. In the National Eleventh Five-Year Development Plan proposed: to improve the utilization rate of recycled paper. Because the utilization rate of recycled paper in China is only about 30%, which is less than half of that in developed countries; and the utilization of recycled paper can not only save valuable forest resources and energy, but also reduce the emission of pollutants, and even realize zero emission. Recycled paper production process requires less energy than the production of virgin pulp is very low, so this is a benefit to the country and the people, for the benefit of future generations, but also one of China's basic national policies. According to the variety of paper production, the raw materials are waste books and magazines, white paper edges or old boxboard, the production of low-grade toilet paper and superstitious paper, wrapping paper, writing paper, yellow paper, firecracker paper, firecracker paper, superstitious paper. The raw materials are crushed and purified and then sent to the paper machine to be formed by the net part, dewatering of burlap, drying of drying cylinder, wrinkling and then rolled, and then rewound, slit and packaged for sale. Production of toilet paper, burnt paper, firecracker paper, wrapping paper, cultural paper, etc.; bamboo, wood, cotton stalks, straw, waste paper, etc. as raw materials. 100% virgin wood pulp paper is not available.

How to produce oxalis

Four kinds of oxalis

Natural oxalis

Less quantity, more expensive than gold

The gallstones in the body of the cow is natural oxalis, which is more expensive than gold. China's annual demand for oxalis is about 5 tons, but the self-produced natural oxalis is less than 1 ton.

Artificial oxalis

Large amount, the efficacy of the second

Extracted from the pig's bile in the relevant substances can be formulated into artificial oxalis, the price of less than 0.5% of the natural oxalis. But because of the efficacy of the problem, artificial oxalis can not completely replace the natural oxalis.

Cultivation in the body

Oxalis is good, the scale of production is difficult

Like raising pearls, in the body of the cow planted in the foreign body, prompting the growth of stones. This kind of oxalis is good, but not easy to scale production, China's peak only 1,000 cows to undergo surgery.

In vitro cultivation of oxalis

Good efficacy, scale production is easy

A doctor invented the use of cow bile in cattle in vitro cultivation of oxalis technology, the efficacy of its good and easy to scale production, this technology is ultimately transferred at a high price of 28.5 million yuan.

How is PO film produced?

Agricultural PO film is a new type of agricultural film, its effect is more prominent in the following aspects: 1, excellent transparency: the use of high-grade olefin raw materials, low haze, high transparency. So that the morning light transmittance rate is high and the scattering rate is low, so that it will warm up quickly in the morning.

2, super continuous mist elimination, drip ability: the use of mist elimination drip agent coating drying treatment, can inhibit fog generation, mist elimination drip period can be achieved with the service life of the agricultural film synchronization.

3, strengthen the heat preservation performance: film internal high-tech special organic insulation agent, so that most of the infrared radiation in the shed to the outside is reflected back. Effectively control the heat dissipation. Ensure the growth temperature of crops at night, shorten the maturity period. Can effectively prevent the sudden drop in temperature at night caused by frost damage to crops.

4, long service life: the use of high-tech antioxidants and light stabilizers, greatly extending the service life of the film, normal use can reach more than 3 years.

5, super tensile strength. The raw material has super tensile strength and tear strength.

6, anti-static, non-sticky dust: nano technology, four-layer structure. Surface anti-static treatment. No precipitates, not easy to adsorb dust, to achieve the effect of maintaining high light transmission for a long time.

Its production process abroad and domestic are very different, Japan generally use double-sided printing process, the uniformity of its products, the stability of the existence of more obvious advantages. However, the width of the Japanese products is generally below 10 meters, and the wide width generally requires docking.

In recent years, the domestic production of a number of PO film manufacturers, product quality varies, the domestic use of coating and drying process. The process is as follows: extrusion blow molding, corona surface treatment, demisting and dripping agent tank infiltration, oven drying, winding, packaging.

Qingzhou City Kailifeng Plastic Factory is a professional manufacturer of grouting film, has more than ten years of experience in the production of grouting anti-mist film. Since 2009, it has taken the lead in developing external spray drying technology in China. The factory newly purchased imported large-scale three-layer **** extrusion production line, using Japan's imported high-grade polyolefin raw materials and Japan's imported coating liquid for the production of PO film, to realize the 3 + 1 layer PO film production. Since the product has been put on the market, the market response is good.

How are dogs produced?

The production process is roughly divided into three stages: Stage 1: The female dog has the phenomenon of scratching the ground, scratching the production nest. Breathing is accelerated and the cervix begins to dilate during this stage, which lasts about 12 to 24 hours. Stage 2 : The abdominal muscles of the bitch will contract to expel the fetus from the cervix *** to the outside of the body. Before the fetus is expelled, the amniotic fluid bag will rupture at the ***, causing the amniotic fluid to flow out, and the contraction of the abdominal muscles will result in the expulsion of the fetus, which will last for about six hours, after which the fetus will be expelled every 10 to 60 minutes, but the maximum time may be up to three hours. Most of the dogs come out head first, but it is normal if the hind limbs come out first. Stage 3 : The earliest possible time for expulsion of the placenta is 10 minutes after the birth of the dog, but it is normal for the placenta to be expelled after several hours. The period from abdominal contractions to the expulsion of all the fetuses should be completed within 24 hours. The shortest time may be one to two hours.

How is GRC produced?

First in the molding mold coated with mold release agent, and in the mold surface paved a layer of 1:1 (cement: sand) cement mortar, and then paved a good anti-alkali mesh fiberglass cloth, and put a good pre-tied molding of the embedded rebar in accordance with the cement, sand, anti-alkali fiberglass filament, the ratio of (1: 1.5: 0.15) another additive cement mortar uniformly placed in the mold, and paved, compaction, wiping smooth, steam-drying. Molding. Finally form excellent, high-quality GRC products.

How is the production of wine

The basic production process of wine, white wine brewing methods 1. Harvesting - 2. skin - 3. juice (isolation of grape skins, seeds and kernels) - 4. -4. Clarification - 5. Fermentation, cultivation - 6. Clarification before bottling - 7. Bottling 2. --Harvesting - 2. Skin-breaking and de-stemming - 3. Juicing (retaining the skins and isolating the seeds and cores) - 4. Fermentation and cultivation - 5. Clarification - 6. -5. Clarification - 6. bottling ※ brewing white wine, usually in the white grapes (sometimes also need red grapes, but only the juice) after the juice on the pulp, the core of the isolation, leaving the juice to ferment on their own. For rosé wines, the skins are left in the juice for a while to get the color; for red wines, the skins are left to ferment together to get the tannins, the color, and the richer structure (sometimes even the stems are left in the juice for a while to get more tannins), and for this reason, the unstable aromatic compounds in the red wines are reduced.