Pulp molded material
(57) Abstract:The material used in the field of building materials for thermal insulation of buildings and structures, furniture industry and other sectors of the economy. The material is made of spongy wood particle size of 3.8-4 mm with KF. h20 and tonkoizmelchennyj wood particle size < 3.8 mm with KF. h20 at a ratio of 1 : 0.3 to 0.5. As wood particles used fire bast plants, sawdust, logging residues, or a mixture thereof. Technical result: getting a cheap environmentally friendly material with improved operational performance by increasing its strength. 1 C.p. f-crystals, 1 table. 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.Teplonositeli newly constructed buildings can be achieved through the proposed new cheap insulating materials made from waste wood and flax industries. Such materials and terjadinya in the waste wood, emitted when the pre-treatment, it makes the resulting material is environmental friendly. The production of such materials is a rational direction for the integrated use of waste products.Known insulating material containing interconnected particles ground and not the fires of flax (see USSR Author's certificate N 1530601, class C 04 B 18/24, publ. 23.12.1989).The disadvantage of this material is its low mechanical strength and low thermal insulation properties.Closest to the invention to the technical essence is a pulp molded material composed of particles fires fraction of 0.5-3 mm, initial fires and fires fine grinding, interconnected by polysaccharides isolated from the particles when they are grinding in the wet state (see RF Patent N 2081098 class. C 04 B 40/00, publ. 10.06.1997).The disadvantage of this material are low physico-mechanical parameters.The objective of the invention is to provide a molded pulp material, ensuring the achievement of the technical result consists in the improved performance by increasing chastity, interconnected polysaccharides, is achieved by the fact that it is made of spongy wood particle size of 3.8-4 mm shape factor of the particles TOF. h20, and tonkoizmelchennyj wood particle size < 3.8 mm with a shape factor of the particles TOF. h< 20, the ratio of the spongy and tonkoizmelchennyj wood particles, respectively, is 1: 0.3 to 0.5, and as the wood particles used fire bast plants, sawdust, logging residues, or a mixture thereof.The main raw material for the proposed material is waste from flax industry - fire bast plants, flax fire, which is the woody part of the stem of the flax. In the processing of flax trusts formed about 2.8 tons of fires per 1 ton of fiber, which is irrational, and 100 thousand tons of flax straw can ensure the production of the material in volume from 100,000 to 200,000 m3per year.If the ratio of spongy to concratulations wood particles and in particular TO aF. h(the ratio of length to thickness) in the material creates a certain structure, which is the main determinant of its prognostic among themselves, and when the molding increases the number of adhesive contacts, causing an increase in strength.The proposed pulp molded material produced by next technology.Wood particles (linen chaff, sawdust, forest residues) are razvlecheniy in a weak alkaline medium by any known method until the particle size of 3.8-4 mm and KF. h20 and the thin razvlecheniy to the particle size of < 3.8 mm andF. h< 20.From wood particles when razvlechenii them in an alkaline medium are polysaccharides (pectin, hemicellulose), which bind the particles together. The resulting mixture is subjected to cold forming under pressure and dried.Specific examples and operational characteristics of the proposed pulp molded material and the prototype shown in the table.As can be seen from the table, the proposed pulp material has a high strength (MPa) 1,0 instead 0,40 prototype, its heat and sound insulation properties correspond gastropanel indicators.Pulp molded material according to the invention on the organoleptic and physico-chemical parameters meet sanitary-hygiene the Alov. 1. Pulp molded material containing wood particles interconnected by polysaccharides, characterized in that it is made of spongy wood particle size of 3.8-4 mm shape factor of the particles TOF. h20 and tonkoizmelchennyj wood particle size <3.8 mm with a shape factor of the particles TOF. h<20, the ratio of the spongy and tonkoizmelchennyj wood particles, respectively, is 1: 0.3 to 0.5.2. Pulp molded material under item 1, characterized in that as the wood particles used fire bast plants, sawdust, logging residues, or a mixture thereof.
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