CN1149524A

CN1149524A - Eucalyptus medium-density fibre board

Info

Publication number: CN1149524A
Application number: CN 95118155
Authority: CN
Inventors: 李永青; 符爱珠
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-07
Filing date: 1995-11-07
Publication date: 1997-05-14

Abstract

An eucalyptus medium-density fibre board uses sub-standard material such as tree tip, branch, etc. through slicing, removing impurities, boiling, then adding ureaformaldehyde resin, solidifier and buffering agent, and the product is formed under thermo-pressing. It features rational process, low cost, good quality, wide usage (suitable for building finishing, furniture, building trade, vehicle, etc.), solving the tension situation of timber in our country, and it is a new developing project with good economic benefit and social benefit.

Description

The eucalyptus medium density fibre board (MDF)

The invention belongs to a kind of eucalyptus medium density fibre board (MDF).

At present, remove the U.S. and built up in the world since the first hand medium density fibre board (MDF) factory, countries in the world are also along with development.Also corresponding development such as Fuzhou Artificial Plate Factory of China, brilliance timber mill, Beijing, Shanghai Artificial Board Factory, but they suit measures to local conditions, and use different material, produce product to some extent.Their great majority all are as raw material with bagasse, cotton bar, reed rod, straw and weedtree etc., the product of producing is defective, some does not meet national standard, do not enter the international market, can only relax the sub-fraction that domestic timber uses, far can solve China's timber and use problem in short supply.For example: patent 91109899.2 pressboards, patent 92100691.8 are made the method for wood fibre board, and production technology of patent 93109707.X plant fiber molding goods or the like also is like this.

The purpose of this invention is to provide a kind of eucalyptus medium density fibre board (MDF), be non-gauge material such as the tree head that makes full use of the eucalyptus that this locality abounds with, branch as raw material, produce the premium wood boards that is rich in use value.

The present invention after doing dimension stock section, boiling with eucalyptus head, branch etc., adds additive hot pressing and forms.Non-dimension stocks such as first tree head with eucalyptus, branch are through slicer, be cut into the wood chip of certain specification, after mechanical picker is removed impurity with chip classification and purification, boil with steam, during preheating, use saturated vapor, steam pressure is 6～8Pa, digestion time 1～6 minute, the length of preheating digestion time, can be according to the moisture content of wood chip and the content of " tannin ", and factor such as the specification of wood chip and deciding, well-done wood chip is sent into defibrator, carries out wood chip fiber separation, drying, make qualified dried fiber, send into plate shop machine after metering and mat formation.Prepare with Lauxite dilution back adding curing agent, buffer in addition, squeeze in the blow-off pipe through the glue pump again, be sprayed on fiber.Urea-formaldehyde glue for well, and makes applying glue even with 80Kg/M3, and the spreading head through make-up machine becomes continuous slab to fiber interweaving.The plate embryo is deburring again after precompressed, is cut into certain specification, advances heating pressurization in the hot press then, and the good hair plates of hot pressing is through cooling, saws limit, sanding, classification again and just can.

Production technology of the present invention is reasonable, and unit cost is low, quality good, of many uses, the use value height.Making full use of the non-gauge material of eucalyptus, not only can solve China's timber situation in short supply, and can find one's way into world market and earn foreign exchange, is the explorative new projects with good economic benefits and social benefit.

The present invention utilizes the non-dimension stock of eucalyptus to make medium density fibre board (MDF).Large stretch of eucalyptus woods is arranged in area, west of Guangdong Province Yuexi, Guangdong, and annual cut down the eucalyptus that comes except that partly as architectural fore-set wood, stringer wood be processed on a small quantity fragment undersells, a large amount of eucalyptus heads, branch etc. are all committed to the flames as the firewood charcoal, unfortunately tangible, now eucalyptus head, branch etc. are collected, perishable because of eucalyptus, the storage phase is unsuitable oversize, generally is advisable to be no more than three months.Also can cut out the wood chip of certain specification, be placed in the warehouse,, sift out silt, bark, metal sundries and underproof wood chip etc. then through mechanical picker through slicer.For guaranteeing the operate as normal of defibrator, guarantee the quality of product, remove the part " tannin " in the wood chip, to alleviate the color and luster of fiber, with wood chip preheating boiling, defibrator process, make wood chip fiber separation, drying earlier, utilize the glue pump that the sizing material for preparing is sprayed on the qualified dried fiber, through hot pressing, cooling, saw limit, sanding etc. by grade and just can be made into again.The performance of eucalyptus medium density fiber is similar to timber and is better than timber, and capacity is moderate, and intensity is big, and fiber is even, and structure is tight, and qualitative degree height, its fiber molecule are organized the not obvious difference of direction in length and breadth of seeing, no knot trace, and the characteristics of about one.Available general conventional tool processing, no matter saw, dig, cut, cutter, grooving, borehole are sticked on joggle or on the surface, japanning, printing or embossment, it is easy to construct invariably, and finished product is good.Be used for building word finishing, furniture making, machining, building industry, vehicle and household appliances shell making etc., its purposes is extensive especially.

Claims

1, a kind of eucalyptus medium density fibre board (MDF), be to use the eucalyptus head, non-dimension stock such as branch is made, it is characterized in that: elder generation is with the tree head of eucalyptus, non-dimension stock such as branch is through slicer, be cut into the wood chip of certain specification, after mechanical picker is removed impurity with chip classification and purification, boil with steam, during preheating, use saturated vapor, steam pressure is 6～8Pa, digestion time 1～6 minute, the length of preheating digestion time, can be according to the moisture content of wood chip and the content of " tannin ", and factor such as the specification of wood chip and deciding, well-done wood chip is sent into defibrator, carries out the wood chip fiber separation, dry, make qualified dried fiber, send into plate shop machine after metering and mat formation.Prepare with Lauxite dilution back adding curing agent, buffer in addition, squeeze in the blow-off pipe through the glue pump again, be sprayed on fiber.Urea-formaldehyde glue for well, and makes applying glue even with 80Kg/M3, and the spreading head through make-up machine becomes continuous slab to fiber interweaving.The plate embryo is deburring again after precompressed, is cut into certain specification, advances heating pressurization in the hot press then, and the good hair plates of hot pressing is through cooling, saws limit, sanding, classification again and just can.