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animal glue,gelatin ,JELLY GLUE

Date: 2010/2/20 17:33:47

Animal glue
[English]: animal glue and gelatin

[Explain]:

Animal skin, bone or tendon, such as raw materials, will be contained in one of the collagen after partial hydrolysis, extraction and drying solids made of protein. Color light yellow to brown. Can dissolve in water, slightly soluble in alcohol, insoluble in organic solvents. Its aqueous solution with surfactant, viscosity higher, after cooling to freeze into a flexible gel, heating status and then restore solution. Mainly used for industrial adhesive, emulsifying agent and emulsion stabilizer, processing at the time of flocculant, paper and textile industry in the sizing agent, as well as for the printing industry and manufacture of plate making ink roller and so on, in food, photography materials, pharmaceuticals and cosmetics and other production areas have a wide range of uses. Modern development of microencapsulation technology are animal glue the new fields of application. Because of animal glue waste materials are used, so the production of animal glue is a kind of industrial waste to treasure. Animal glue can be divided into  bone glue and leather glue according to the raw materials used; According to the extent ,products are divided into coarse refined products (such as bone glue, hide glue) and refined products (such as gelatin);It be divided into two types of gelatin and industrial glue according to the type of products .Gelatin is the main product. There mainly are three parts of  gelatin production process, raw material pretreatment, extraction and manufacturing of finished part.

Dongwujiao

Animal glue

Animal glue and gelatin

Animal skin, bone or tendon, such as raw materials, will be contained in one of the collagen after partial hydrolysis, extraction and drying solids made of protein. Color light yellow to brown. Can dissolve in water, slightly soluble in alcohol, insoluble in organic solvents. Its aqueous solution with surfactant, higher viscosity, cooling will freeze into a flexible gel, then heated to restore solutions. The latter are the exclusive characteristics of animal glue can be quantitatively to the gel strength to that known as the freeze on our habits. This is animal glue decide the value of merchandise the main physical properties, are formed under standard conditions at the gel rigidity. Commodity value increases with the freezing power increased. Cold with a force known as勃卢姆of special apparatus to measure the "g" express.

Animal glue is mainly for industrial adhesive, emulsifier and emulsion stabilizer, processing at the time of flocculant, paper and textile industry in the sizing agent, as well as for the printing industry and manufacture of plate making ink roller and so on, in the food, photographic materials, pharmaceuticals and cosmetics and other areas of production also have a wide range of important uses. Modern development of microencapsulation technology are animal glue the new fields of application.

Animal glue in the national economy has a unique status essential. According to incomplete statistics, so far there is more than 30 industries, over 1000 kinds of products should be used for animal glue. Despite the constant emergence of new materials, but in some areas (such as photographic materials), the animal glue or can not be replaced. Animal glue used in the production of animal bones and skins are all bits and pieces of waste, can be used to play a bigger role and effectiveness. Such as their waste is causing pollution, therefore the production of animal glue is a kind of industrial waste to treasure.

History about 27 century BC, built the pyramids of Egypt had found the kind animal glue. Chinese at BC 500 years, "Kao Gong Ji" in "plastic deer Qingbaikouan,赤白plastic horse, plastic cow fire red, black plastic rats, fish glue traps, rhino plastic yellow" and so recorded. Description 2000 years ago China has already started manufacturing and application of animal glue, mainly medicinal, used ink and adhesive used.

Europe at the beginning of the 18th century to extract small bone gelatin, as a food additive. 1847 French first gelatin for photographic paper production. British official in 1871 developed a dedicated photographic gelatin.

China in 1921 set up in Shanghai, Shanghai gelatin factory, but only the production of skin glue; at Jinan, Qingdao simultaneously set up a bone meal plant, after the glue extracted from the bone meal. In 1932 first set up in Jinan glue factory. Shanghai in 1935 began producing gelatin. To 50 in the early seven total production of animal glue factory, the total production capacity of 2500 tons / year. Most of the products are industrial glue (glue and hide glue), a small amount for gelatin (edible). Beginning in 1958 with the production of photographic gelatin. Inerting plastic camera in 1983 (that is, with inert photographic gelatin, also known as pure plastic) trial successfully. Guangdong Kaiping in 1988 built a gelatin factory specialized photographic gelatin (including Inerting plastic) production line. To 80 at the end of the country's total production capacity reached 40,000 tons / year, accounting for about 40% gelatin.

Classification of animal glue bone glue press materials can be divided into two major categories of plastic and leather. Broadly speaking have blood glue animal glue, fish glue, cheese glue, plastic, such as turtle shell, but these products do not, do not use a wide range of animal glue are generally not included in the classification. According to the degree of refined products points, easy processing of semifinished product for the glue and hide glue, fine processing of refined products for the gelatin. By product into gelatin and industrial glue (glue and hide glue) the two types. Than the use of gelatin glue and hide glue is much broader. Modern manufacturing enterprises are mostly of animal glue to gelatin as the main product. Glue used to put on, hide glue and gelatin are collectively referred to as three plastic.

Production process gelatin production process there is the main raw material pretreatment, extraction and product manufacturing.

Pretreatment of raw materials to remove materials (aggregate or leather material) contained in the non-collagenous material, such as fat, minerals and so on. The main processes are degreasing, alkali treatment, acid treatment. Pretreatment of raw materials for plastic industry is relatively simple, for gelatin is higher. Pretreatment process and finished product variety and quality.

Extraction of raw materials contained in a first step in the formation of collagen cross-linked hydrogen bonds or electrostatic nature of the role of keys in the water under the fracture. The second is the hydrolysis of covalent bond rupture, causing the disintegration of collagen, this role is called helicase. Generation after helicase soluble animal glue. By hot water extraction has been a concentration of 3 ~ 8% (the majority of 5 ~ 7%) of the light glue. For different products, extraction steps and process conditions are different.

Finished products manufactured by the light glue made of animal glue products, primarily through filtration, evaporation, gel forming, drying and other processes.

① filters: general use of Plate and Frame Filter Press and cotton as a filter medium浆板. Such devices are cheaper, but the removal of filter cake to intermittent use of artificial, and is suitable for small and medium-sized. Modern large-scale production device used by the filter leaf group, pressure composed of cones and drive centrifugal self-cleaning leaf filter. Pressure leaf filter tube in place, the filter lobe connected with the hollow shaft, from top to bottom are covered by very thin metal wire. Short pre-glue add diatomite filter aid slurry transferred into a filter with a pump into the pressure cylinders, leaf filtration on filter aid in the formation of a filter medium layer. After a certain period of time filtering operation, it will filter leaf group rotation, using centrifugal force to clear the dregs and the filter aid together.

② evaporation: the use of tubular or multi-effect plate evaporator, generally carried out under decompression. After evaporation of the liquid concentrations of up to 20 ~ 25%.

③ gel forming: the use of transfer drum or belt machine gel, so that condensed liquid cooling cemented irregular thin sheet or small granules. Commonly used in cooler have both inside and outside the casing, which is a cooling jacket both inside and outside of the tube-type equipment. Glue stress at the annular gap between low-down-off, space is also equipped with a rotating blade, cooling gel after the scraper and fluid in the joint efforts of squeezing through the export of porous plate, squeezed out thin strips of the gel. Therefore, this device also known as the squeeze machine.

④ Drying: Using a roller or long dryer belt dryer Net. Roller clearance operation are applicable to small and medium-sized. Net long belt of continuous operation are applicable to large factories. Product moisture content after drying at 16% below the general. Some products in the dry to go through crushing and screening, to be finally finished.

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