A method of making hardboard


(57) Abstract:

Usage: in woodworking and pulp and paper industry in the manufacture of soft wood booknote plates. The inventive method of manufacturing a wood-fibre boards, including the preparation of wood pulp by its processing binder - sapropel, ebb carpet, pressing and heat treatment of the plates. In its composition additionally injected waste paper or scop in the following ratio, wt.%, wood particles: trash or scop: binder - sapropel(55 - 79): (1 - 30). (1 - 20). 2 table.


Same patents:

FIELD: wood-working industry; production of pressed building items.

SUBSTANCE: the group of inventions is pertinent to the field of production of pressed building items made out of plant roughage and may be used in wood-working construction industries and other branches of economy. The panel made by pressing out of a carpet without synthetic binding materials consists of a mixture of a birchen bark ground up to a faction of 40-5000 microns and a filler predominantly out of cellulose filaments at the following ratios in respect to the total dry solid matter (in mass %): a birchen bark - 60-95, cellulose filaments - 5-40. In an alternative version of the panel, which is made the same way as the above, the outer surfaces of the carpet are strengthened with lingo-cellulose-polymeric compound including an excelsior and the KF-EC resin with a hardener or an excelsior and triturated secondary polymer taken in amount of 10-12 mass % to the weight of the excelsior. At that the share of the lingo-cellulose-polymeric compound makes 20-40 % to the total dry weight of the carpet. The method allows to use a ground birchen bark without synthetic binding agents for shaping a carpet and its consequent pressing. At that for a carpet formation they use the birchen bark ground up to a faction of 40-5000 microns, and a filler mainly made out of cellulose filaments taken in the following ratio in respect to the total dry weight(in mass %): a birchen bark-60-95, cellulose filaments - 5-40. Before formation of the carpet the filler is moistened up to 18-20 % of absolute humidity and is mixed with ground birchen bark. The carpet is formed with a thickness equal to 200-300 % of the thickness of a finished panel. The group of the inventions ensures simplification of the production process, reduction of its cost, expansion of the range of the List of items.

EFFECT: group of the inventions ensures simplification of the production process, reduction of its cost, expansion of the range of the List of items.

8 cl, 1 tbl

FIELD: woodworking industry, in particular composition for soft groundwood board.

SUBSTANCE: claimed composition contains (mass %): wood fiber 86.7-92.5; fiber-containing precipitate 9.6-3.8; paraffin emulsion 2.5; and sulfuric acid 1.2; wherein ratio of wood fiber and fiber-containing precipitate is 90-96:10-4, respectively. Fiber-containing precipitate used as wood raw material represents waste from wet method for production of soft groundwood board and sulfate method for production of cellulose.

EFFECT: method for production of soft groundwood board with reduced prime wood mass consumption without deterioration of characteristics.

2 tbl, 1 ex

FIELD: manufacture of substantially flat articles, for instance particle boards and other articles of industrial wood residue or vegetable raw materials by hot pressing thereof.

SUBSTANCE: method for particle board production involves performing hot molding at temperature of 120-200°C and under pressure of 2.5 - 30.0 MPa for panel forming. Industrial waste, molasses, concentrated corn steep or mixture thereof are used as binding material, wherein lime and starch-containing materials are added to mixture including industrial wood residue or vegetable raw materials and the binding material before hot molding operation beginning.

EFFECT: increased ecological safety and increased strength of the panels.

4 cl, 1 tbl, 1 ex

FIELD: construction materials industry; production of the composite materials used in production of wood pressing masses.

SUBSTANCE: the invention is pertaining to production of the wood pressing masses exclusively on the basis of the fragments of the vegetable origin, in particular, to the molding compound for manufacture of the composite materials. The invention presents the molding compound containing fragments of the lignocellulose material containing cellulose, lignin, hemicelluloses, free sugars produced from of the hydrocarbonic part of the vegetable material at its steam treatment and differing by the fact, that the lignocellulose material before steam treatment at the room temperature is subjected to steeping by the pure water within 20-120 minutes, which is taken in the ratio of 1 mass share of water to l mass share of the lignocellulose material. The technical result of the invention - preliminary steeping allows to reduce the temperature and the steam treatment duration, which leads to reduction of the power consumption and to the increase of productivity.

EFFECT: the invention allows to reduce the temperature and duration of the lignocellulose material steam treatment, ensures reduction of power consumption and increase of productivity.

1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: fibrous plate contains base, consisting of at least 30 wt % vegetative fibres; substance absorbing and decomposing aldehydes, impregnating, with its further hardening, near-surface area of base from both sides, and which contains at least carbodihydroside. Said substance can impregnate only one base side. Carbodihydroside is applied on base by sputtering in form of water solution together with surface active substance.

EFFECT: obtaining fibrous plate with property of simultaneous absorbing and decomposing both formaldehyde and acetaldehyde.

13 cl, 3 dwg, 6 tbl, 3 ex

FIELD: process engineering.

SUBSTANCE: proposed method comprises gluing wooden shavings or fibers together. Note here that prior to gluing, wood is subjected to treatment by bisulphate in atmosphere saturated with steam, or in air saturated with steam for 3 to 8 minutes at 6 to 12 bar. In using formaldehyde-resin binders, articles with extremely lows evaporation of chemicals can be produced that feature relatively light colour.

EFFECT: reduced degree of evaporation.

8 cl, 1 tbl, 1 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of composited materials from lignocellulose raw and can be used in construction and furniture production. Proposed method comprises grinding raw material, drying, processing by steam at higher temperature and pressure during time interval sufficient for decomposition of hemicelluloses followed by elevated-temperature compaction. The latter allows thermal hardening of hemicelluloses decomposition products to produce polymer matter that makes a binder for lignocellulose material. Grinding lignocellulose raw material, represented by wheat straw or aspen wood, is performed to 0.2 mm-size, steam processing is carried out at 170 to 190°C. Note here that, prior to elevated-temperature compaction, 5 to 30% by weight of total dry weight of filler are added selected from the group of electrically conducting or coloring material, e.g. natural graphite, aluminium powder.

EFFECT: simplified method of producing composite materials, improved properies.

2 cl, 1 tbl, 12 ex

FIELD: construction industry.

SUBSTANCE: invention refers to wood-working, furniture and construction industry. In order to develop non-toxic plate material, it is proposed to use moulding material from plant raw material without using synthetic binders. Moulding material in the form of plant raw material particles containing cellulose, lignine, easy- and difficult-to-hydrolyse polysaccharides and carboxyl groups is obtained by means of cavitation treatment of plant raw material; at that, it contains easy- and difficult-to-hydrolyse polysaccharides 13-18% and 28-37%, correspondingly, cellulose with copper index of 1.7-2.9 g/100 g - 53-58 %, lignine (Komarov) 31-37% and carboxyl groups 0.6-4.9 %.

EFFECT: cheap plate materials having high ecological and physic and mechanical properties are obtained from moulding material.

6 cl, 1 ex, 5 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of plate materials based on cellulose-containing particles impregnated with glue base on carbamide-formaldehyde resin to be used woodworking industry. Cellulose-containing particles are mixed with glue based on carbamide-formaldehyde resin and acid solidifier. Said cellulose-containing particles represent flax boon. Note here that said glue comprises additionally modifier butanol-1 in amount of 1.4…1.6% of carbamide-formaldehyde resin weight.

EFFECT: production of new structural material with increased physical and mechanical properties.

1 cl, 2 tbl, 2 dwg

FIELD: wood industry.

SUBSTANCE: invention may be used to extract, recycle and process wood wastes in process of fibreboards production. The method includes supplying waste waters downstream pouring-forming machine into an accumulating-balancing reservoir, its pumping along a bypass pipeline into a disperser with simultaneous air supply from atmosphere into the bypass pipeline, formation of air and water mixture passing through the disperser, supply of air and water mixture into a dynamic absorber to create floating complexes, their supply into a receiving chamber of a flotation plant, separation into foam sent to the pouring-forming machine and treated water supplied to the accumulator. The system for method realisation comprises an accumulating-balancing reservoir for collection of waste waters, a bypass pipeline and a disperser to create air and water mixture, a dynamic absorber to form floating complexes, a floatation plant with a receiving chamber, a foam-producing mechanism and a foam-collecting pocket to separate caught fibre in the form of foam and an accumulator of treated water.

EFFECT: inventions ensure simple and cheap technology for extraction, recycling and processing of internal fibreboard production wastes with the possibility of secondary wood fibre catching and return directly into the process cycle without its additional treatment.

2 cl, 1 dwg, 2 tbl, 1 ex