A method of manufacturing a solid fiberboard
(57) Abstract:Usage: to obtain a firm wood-fiber plates in the wet. The inventive ground wood pulp is diluted with water to a predetermined concentration. From the obtained suspension casting machine molded fibrous Mat and subjected to hot pressing. Pressed material is impregnated with the melt mixture of raffinate and concentrate polyfunctional oxidized compounds within a specified time. The treated plate is subjected to heat treatment. table 2. 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) in the wet.A method of obtaining a solid fiberboard (MDF) using the concentrate of unsaponifiable substances sulfate soap, which is as follows: wood-fibre pulp, obtained from a mixture of softwood and hardwood in excellent machine form the carpet, which is then cut, the resulting billet is pressed at a temperature of 180oC with the subsequent drawing on outprespace at a temperature of 165oC for 4 h, the ratio of the fibre mass and unsaponifiable matter (%), equal to (88-98):(2-12).The main disadvantage of this method is inefficient use of concentrate unsaponifiable substances sulfate soap, which is a complex substance and contains valuable biologically active substances, which can be used for the production of medicinal products, food supplements and cosmetics.The task of the invention to provide a solid fiberboard with a minimum of environmental pollution and sustainable use of components of neutral substances, which are the waste in the processing of neutral substances with the aim of obtaining biologically active compounds; betulin, sterols, polyprenols and squalene.In the processing of neutral substances hardwood sulfate soap by successive crystallization and filtration of the solution neutral compounds in hydrocarbon solvent receive betulin and sterols, and isolated from the filtrate residual neutral substances are obtained concentrate polyprenols and squalene by extraction aprotic polar solution is ntrat polyfunctional oxidized compounds (PIC). The raffinate is a mixture of aliphatic alcohols C22-C28and residual hydrocarbons, polyprenols C35-C40, triterpene alcohols, 24 methylenecycloartanol, betulin, alpha-sitosterol and beta-sitosterol. Concentrate polyfunctional oxidized compounds (PIC) is a complex mixture of oxidized high molecular weight compounds containing various functional groups, carbonyl, carboxyl and alcohol - viscous resinous product is a reddish-brown color.This task is solved in that milled wood fibrous mass of a mixture of deciduous (80%) and coniferous (20%) wood diluted with water to 1.0% concentration. From the obtained suspension casting machine to form wood-fiber carpet and expose his hot pressing at 190oC. the Extruded material is impregnated with at 90-120oC a melt containing a mixture of raffinate and the VILLAGE; the raffinate; concentrate polyfunctional oxidized compounds (PIC). Consumption impregnating composition 3-10% by weight of absolutely dry plate. The treated plate was subjected to heat treatment at 160-165oC within 3.5-4 hoursIn the manufacture of fiberboard used in this method iskluchiteno and forth in the waste water, since eliminated their use. The same chemical compounds that are included in a sealing compound, insoluble in water. It should also be noted that the components of neutral substances nelituji in the process of heat treatment plates and they do not experience air pollution.Obtained in this way fiberboard does not contain toxic chemical compounds can be released into the environment in the course of their operation.Applying a sealing composition on the basis of neutral substances sulfate soap in quantity is less than 3% is not possible to obtain a stable strength and hydrophobic properties of fiberboard, the collapse of the impregnating composition of more than 10% inappropriate due to some small improvement of physico-mechanical properties of fiberboard and economic reasons, the invention is illustrated by the following examples.Example 1. Milled wood weight of a mixture of deciduous (80%) and coniferous (20% ) wood, dilute with water to 1.0% concentration. From the obtained suspension casting machine molded fibrous Mat and put it under hot pressing at 190oC. the Extruded material is impregnated with at 90-120oC in the melt mixture of Rafiah to 7.0% by weight of absolutely dry /A. from./ plate. The treated plate was subjected to heat treatment at 160-165oC within 3.5-4 hoursExample 2. All the techniques are similar to example 1, but the impregnation is carried raffinate at a rate of 10% by weight.with. plate.Example 3. The method is carried out analogously to example 1, but the impregnation is carried concentrate polyfunctional oxidized compounds in the amount of 8% by weight.with. plate.Example 4. The method is carried out analogously to example 1, but the impregnation are a mix of RAF and SETTLEMENT in the amount of 3% by weight.with. plate.In table. 1 shows data on group composition and processing products source neutral substances.The test results fiberboard on the proposed method are presented in table. 2. A method of manufacturing a solid hardboard, including molded carpet from wood pulp, extrusion, impregnation and heat treatment, characterized in that the impregnation implement waste recycling neutral substances hardwood sulfate soap in the amount of 3 - 10% of absolutely dry plate, representing the raffinate on the basis of aliphatic alcohols WITH22WITH28and residual hydrocarbons, polyprenols WITH
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 220°C. 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 75-80°C 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 60°C with a subsequent increase in temperature by 10°C, bringing the temperature up to 110°C.
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.