Method of manufacturing products from papier-mache

FIELD: human vital needs satisfaction.

SUBSTANCE: paper material is wound on the blank corresponding to the shape of the product, layer by layer coated with the adhesive, pressed, dried, the preform is impregnated with a vegetable oil, dried, cut into pieces corresponding to the dimensions of the product, and the product surface is handled. New features are layer-by-layer gluing the paper material, carried out with flour paste made from wheat flour with a mass fraction of wet gluten of not less than 28% and water in the ratio of 1:3.5. Sides of the wound paper material glued on the blank of a rectangular cross section is subjected to compression under a pressure of 490*104 PA for 10-15 min, and before drying the preform with a moisture content of 65-70% is removed from the blanks, impregnated at a temperature of 75-80C for 90-130 min with linseed oil with the addition of up to 3% by volume isopropyl alcohol with the further drying of the preform by heating to constant weight, in the mode - 6 days not less than 60C with a subsequent increase in temperature by 10C, bringing the temperature up to 110C.

EFFECT: shortening the duration of the technological process by accelerating the impregnation of the preform while maintaining the shape while increasing the strength of papier-mache products.

2 tbl

 



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to woodwork. Wood-fibre plate comprises wood fibres, polyacrylamide resin representing an amphoteric-ionic resin containing monomers with cation groups and monomers with anion groups related to 7:3 - 3:7 in molar ratio that features molecular weight of 800000 to 3000000, and cationic paraffin. Wood-fibre board production comprises application of suspension with concentration of solids of 2-3 wt % and pH 3-5 and addition of polyacrylamide resin and paraffin to said suspension.

EFFECT: higher strength of and water resistance.

3 ex, 1 tbl, 4 cl

FIELD: textile, paper.

SUBSTANCE: invention relates to manufacture of products from fibrous material, namely egg cartons, glasses for drinks, food trays. There used is the first device which is permeable to air and water and the second device which is heated up to temperature at least 220C. Raw material is supplied to a forming bath. The first device is submerged into it and the initial product is shaped on it by means of application of negative pressure through it. After the first device is taken from initial raw material, it is supplied to the second device. Formed product from fibrous material is placed between the first and the second device. It is heated with the second device with evaporation of at least some water contained in the shaped product from fibrous material. Water is removed until dry matter content in it is at least 70%; after that the product is subject to drying with superhigh frequency radiation.

EFFECT: providing uniformity of strength properties of the product, effective dehydration and preventing its surface being burnt through.

29 cl, 33 dwg

The invention relates to fibrous cellulosic materials and can be used in the field of building materials in the form of sheets and plates intended for thermal insulation of buildings and structures, furniture industry and other sectors of the economy

The invention relates to woodworking, and more particularly to a technology for fibre materials, mainly used for the production of plates

The invention relates to woodworking, timber and pulp and paper industry and can be used in the production of environmentally friendly solid wood-fibre boards (MDF) wet

The invention relates to the production of fibrous material having good heat and sound insulation properties and is intended for use in construction, shipbuilding, aerospace, industrial and furniture industry and other sectors of the economy

The invention relates to the pulp and paper industry, and in particular to methods of obtaining pressed lignocellulosic materials, mainly wood chipboard, for construction and decoration purposes

The invention relates to woodworking industry and can be used in the manufacture of flooring, furniture parts, parts for decoration of halls and wall panels

FIELD: machine building.

SUBSTANCE: invention relates to the vacuum rollers to held, to transfer, to stow or to execute other operations with flexible materials. The vacuum roller contains internal cylinder, in which an internal chamber is made, for vacuum application it is connected with the vacuum course; external cylinder installed with possibility of rotation around the internal cylinder, and in which multiple holes are made, and actuator configured with the possibility to move the internal cylinder between the first and second positions. At that the vacuum roller has the first vacuum profile with the internal cylinder in the first position, and second vacuum profile with the internal cylinder in the second position.

EFFECT: roller is suitable for material handling at high linear speeds.

20 cl, 64 dwg

FIELD: human vital needs satisfaction.

SUBSTANCE: paper material is wound on the blank corresponding to the shape of the product, layer by layer coated with the adhesive, pressed, dried, the preform is impregnated with a vegetable oil, dried, cut into pieces corresponding to the dimensions of the product, and the product surface is handled. New features are layer-by-layer gluing the paper material, carried out with flour paste made from wheat flour with a mass fraction of wet gluten of not less than 28% and water in the ratio of 1:3.5. Sides of the wound paper material glued on the blank of a rectangular cross section is subjected to compression under a pressure of 490*104 PA for 10-15 min, and before drying the preform with a moisture content of 65-70% is removed from the blanks, impregnated at a temperature of 75-80C for 90-130 min with linseed oil with the addition of up to 3% by volume isopropyl alcohol with the further drying of the preform by heating to constant weight, in the mode - 6 days not less than 60C with a subsequent increase in temperature by 10C, bringing the temperature up to 110C.

EFFECT: shortening the duration of the technological process by accelerating the impregnation of the preform while maintaining the shape while increasing the strength of papier-mache products.

2 tbl

FIELD: textile, paper.

SUBSTANCE: invention relates to manufacture of products from fibrous material, namely egg cartons, glasses for drinks, food trays. There used is the first device which is permeable to air and water and the second device which is heated up to temperature at least 220C. Raw material is supplied to a forming bath. The first device is submerged into it and the initial product is shaped on it by means of application of negative pressure through it. After the first device is taken from initial raw material, it is supplied to the second device. Formed product from fibrous material is placed between the first and the second device. It is heated with the second device with evaporation of at least some water contained in the shaped product from fibrous material. Water is removed until dry matter content in it is at least 70%; after that the product is subject to drying with superhigh frequency radiation.

EFFECT: providing uniformity of strength properties of the product, effective dehydration and preventing its surface being burnt through.

29 cl, 33 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to woodwork. Wood-fibre plate comprises wood fibres, polyacrylamide resin representing an amphoteric-ionic resin containing monomers with cation groups and monomers with anion groups related to 7:3 - 3:7 in molar ratio that features molecular weight of 800000 to 3000000, and cationic paraffin. Wood-fibre board production comprises application of suspension with concentration of solids of 2-3 wt % and pH 3-5 and addition of polyacrylamide resin and paraffin to said suspension.

EFFECT: higher strength of and water resistance.

3 ex, 1 tbl, 4 cl

FIELD: building industry.

SUBSTANCE: during the first stage an element is created, preferably, of cellulose, using hot moulding under pressure in the mould, during the second stage, as soon as the element has a solids content of at least 60% after its release from the mould, the said element is covered by a pigmented lacquer and dried; and during the third stage, as soon as the element has a solids content of at least 98% the said element is impregnated with hot bitumen. Specific operating conditions are set. The covering elements comprise, in particular, a side portion of the ridge, a ridge cap, a set of the ridge roof covering, a cant board, or a border around a hole in the roof, and a hipped roof element for the creation of connection between two planes of the roof.

EFFECT: increase in reliability.

15 cl, 12 dwg

FIELD: pulp and paper industry.

SUBSTANCE: invention relates to tooling for moulding articles from cellulose. Device for moulding comprises a mould and a support plate with a cavity and flat support surfaces. Mould has porous body made by sintering and having outer moulding surface and inner surface. Mould inner surface is machined after sintering powder zone. Said mould surface zone is intended for connection with support surfaces of support plate to make vacuum chamber.

EFFECT: producing a high-quality mould, which does not require a large amount of energy for heating of shaping surface, a method which does not require high time expenses.

15 cl, 11 dwg

FIELD: human vital needs satisfaction.

SUBSTANCE: paper material is wound on the blank corresponding to the shape of the product, layer by layer coated with the adhesive, pressed, dried, the preform is impregnated with a vegetable oil, dried, cut into pieces corresponding to the dimensions of the product, and the product surface is handled. New features are layer-by-layer gluing the paper material, carried out with flour paste made from wheat flour with a mass fraction of wet gluten of not less than 28% and water in the ratio of 1:3.5. Sides of the wound paper material glued on the blank of a rectangular cross section is subjected to compression under a pressure of 490*104 PA for 10-15 min, and before drying the preform with a moisture content of 65-70% is removed from the blanks, impregnated at a temperature of 75-80C for 90-130 min with linseed oil with the addition of up to 3% by volume isopropyl alcohol with the further drying of the preform by heating to constant weight, in the mode - 6 days not less than 60C with a subsequent increase in temperature by 10C, bringing the temperature up to 110C.

EFFECT: shortening the duration of the technological process by accelerating the impregnation of the preform while maintaining the shape while increasing the strength of papier-mache products.

2 tbl

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