CN101357469A - Production method of medium-density fiberboard using waste and old wood - Google Patents

Abstract

The invention relates to a method for producing medium density fibre boards by utilizing waste wood. The method comprises: waste materials are smashed, processed by steam stewing for softening in a stewing tank, then sent to the millstone cavity of a thermofiner for processing by defibrator process to be fibre-shaped wood pulp, the fibre-shaped wood pulp is in a discharge pulp pipe and sent to a tube-typed drier for carrying out airflow drying process by applying glue by a rubber pipe and relying on steam pressure, and then is sent into a pressing machine for hot press molding after being paved by a paver. The method is characterized in that: the waste materials are wood sections containing steel nails and waste furniture boards, the smashing process comprises: a rolling press is adopted for squeezing, kneading and cutting the waste materials, then the waste materials are impacted by a hammer-typed crusher, thus facilitating the wood materials to be crushed into debris and the impurities in the wood materials to be loose and the steel nails to be separated; the crushed materials are screened by a vibration screen for wiping off small sand, stones and dust impurities; iron type metal grains are wiped off in a magnetic separator, suspending and sorting relying on airflow are carried out in a sorter for wiping off the impurities such as sandstones and non-iron metals. By adopting the production method, the waste furniture and the wood sections containing steel nails can be utilized by removing impurity.

Description

Utilize waste and old wood to prepare the production method of medium density fibre board (MDF)

Technical field

The invention belongs to medium density fibre board (MDF) manufacturing technology field, be specifically related to a kind of production method of utilizing waste and old wood to prepare medium density fibre board (MDF).

Background technology

At present, the raw materials for production of making medium density fibre board (MDF) mainly are the leftover pieces that various planks produce in branch material, the furniture production process etc., these dead meals are cut the pulverizing back be made into medium density fibre board (MDF) by associated production technology.Such as patent wooden fork people earlier application and disclosed " a kind of production method of the medium density fibre board (MDF) of regenerating " (patent No.: patent of invention 200310111863.8), the production method that this technical scheme discloses is: medium density fibre board (MDF) leftover pieces, broken, screening again, applying glue mix glue, mat formation, precompressed, hot pressing, saw limit, sanding, manufactured goods, and its raw materials for production are the medium density fibre board (MDF) leftover pieces.Chinese invention patent once also disclosed a kind of name and had been called " method for preparing medium density fibre board (MDF) " (patent No.: technical scheme 99808225.2), its method that adopts is: the timber or the plant of peeling are ground into the wood fragments bits, sieve then, purify, wood fragments bits after its purification are sent into boiling vessel through reinforced hopper and conveying worm, soften processing back mill with the steam overvoltage and be pressed into fiber, send into through the air blast line by steam pressure and to carry out drying in the tube drier, be sent to after the applying glue on the follow-up spreading machine and mat formation, die mould produces manufactured goods at last on the press, and the raw material that this manufacture method adopts is thin log.Because the leftover pieces that various planks produce in branch material, the furniture production process are very limited, production scale is restricted, and at present a large amount of juggles that contains iron nail, waste and old furniture-plates are because contain impurity such as more metal, sand mud, there is not effective method with Impurity removal, never rationally utilized, caused the great deal of raw materials waste.

Summary of the invention

The object of the present invention is to provide and a kind ofly waste and old furniture, the juggle that contains iron nail can be carried out utilizing waste and old wood to prepare the production method of medium density fibre board (MDF) after removal of impurities is handled.

The object of the present invention is achieved like this: a kind of production method of utilizing waste and old wood to prepare medium density fibre board (MDF), comprise waste and scrap is carried out fragmentation, in cooker, carry out the softening processing of steam boiling, deliver to again that defibrator process becomes fibrous wood pulp in the defibrator mill chamber, fibrous wood pulp passes through the sebific duct applying glue in going out the slip pipe, and send into by steam pressure and to carry out pneumatic conveying drying in the pipe drier and handle, send in the press hot-forming after on spreading machine, mating formation then, it is characterized in that: described waste and scrap is the juggle that contains iron nail, waste and old furniture-plates, its shattering process comprises:

Adopt roll squeezer that it is squeezed, rubs and shears, impact through hammer mill again, make wood materials be broken into particle and make that impurity in the wood materials gets loose, iron nail separates;

Crushing material through the vibratory sieve screening, is removed tiny sandstone, dust impurity;

In magnetic separator, remove the ferrous metal particle;

In separator, rely on the pneumatic floating sorting, remove impurity such as sandstone, nonferrous metal.

The linear pressure of above-mentioned roll squeezer pressure roller is greater than 200kg/cm.

Beneficial effect of the present invention: the log branch of prior art, the general wood chipping equipment that adopts such as leftover pieces is chipped to it, what adopt is sharp keen cutter, can not be applicable to the juggle that contains iron nail, waste and old furniture-plates, and the present invention adopts roll squeezer, hammer mill is to containing the juggle of iron nail, waste and old furniture-plates squeezes, rub, shear and impact, what adopt is the broken instrument of passivity, can effectively will inlay after the fragmentation, being riveted on metal materials such as iron nail on the wood materials and the sandstone that is attaching and wood materials separates, again through vibratory sieve with some tiny sandstones, dust-filtering falls, magnetic separator utilizes magnetic field with iron metal removal, utilize gravity principle to carry out pneumatic separation on the separator and remove sandstone, nonferrous metal etc. are than heavy seeds, just can effectively guarantee the quality of manufactured goods medium density fibre board (MDF), make impurity content lower.Adopt this method to produce medium density fibre board (MDF), the a large amount of juggle that contains iron nail, waste and old furniture-plates just can utilize again, have promptly reduced the wasting of resources, have expanded the raw material source of density fiber board again, production scale is promoted, for enterprise brings huge economic benefit.

Description of drawings

Fig. 1 utilizes waste and old wood to prepare the production method flow chart of medium density fibre board (MDF).

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the invention is described in further detail.

Present medium density fibre board (MDF) production both domestic and external, its conventional production technology is very ripe, the production procedure of domestic and international most producers is: adopt wood chipping equipment or chipper to pulverize on log (mainly being timber with small diameter or branch material) or leftover pieces, again through defibrator process, applying glue, drying, mat formation, operations such as hot pressing, cutting edge, sanding produce medium density fibre board (MDF), its raw-material recovery is defined in the obsolete materials less than impurity content such as raw material, leftover pieces.The production technology major part of medium density fibre board (MDF) of the present invention is identical with routine, its difference mainly is the production technology difference before the fiber production operation, the wood materials that is recovered to factory comprises that MDF saw edge strip, wood chip, wood shavings, the old juggle of building and timeworn furniture disassemble the raw material such as plank that get off, impurity contents such as its material mixes, performance is different, shape is not of uniform size, metal sandstone are many, therefore the technical scheme that its break process adopted needed difference to some extent.At first need the waste and scrap that is recovered to factory is sorted, subregion is stacked and is stored, it is free from foreign meter or content is less separately deposits that MDF is sawed edge strip, log branch, wood chip, wood shavings etc., produce by existing production method, old juggle of the building that contains more sandstone, metal and timeworn furniture are deposited in addition, undertaken by production method of the present invention.Because these wood materials impurity promiscuous mode complexity, there is the surface to attach between it and the wood materials, no any mixing that attaches has to be embedded in together, nail riveting combination arranged, so need adopt the multichannel technique measure to handle targetedly.The wood materials that contains more sandstone, metal that at first will sort out drops in the roll squeezer, through pinch roller it is squeezed, shears, the linear pressure of roll squeezer pressure roller is better in the above effect of 200kg/cm, and the rotating speed of two puck design is inconsistent, and such two pinch rollers have just produced rubs effect (roll squeezer is usually used in the crushing operation in the mining industry).Impact through hammer mill again, make wood materials be broken into particle and make that impurity in the wood materials gets loose, iron nail separates; Then crushing material is filtered out fine dusts and sandstone impurity through vibrating screen mesh, in magnetic separator, remove the scrap iron particle; In separator, rely on the pneumatic floating sorting, remove impurity such as sandstone, nonferrous metal; Broken wood materials after the purification carries out the softening processing of steam boiling in cooker, deliver to again that defibrator process becomes fibrous wood pulp in the defibrator mill chamber, fibrous wood pulp passes through the sebific duct applying glue in going out the slip pipe, and send into by steam pressure and to carry out pneumatic conveying drying in the pipe drier and handle, send in the press hot-forming after on spreading machine, mating formation then.Certainly, can also saw PROCESS FOR TREATMENT such as limit, sanding for the medium density fibre board (MDF) of the demoulding.In addition, because of raw material are reclaimed materials, the fragment after chipping is preferably in equipment such as magnetic separator, airflow separator are installed in the conveying circuit and carries out removal of impurities, reduces impurity content as far as possible, improves the quality of medium density fibre board (MDF).

Claims (2)

1, a kind of production method of utilizing waste and old wood to prepare medium density fibre board (MDF), comprise waste and scrap is carried out fragmentation, in cooker, carry out the softening processing of steam boiling, deliver to again that defibrator process becomes fibrous wood pulp in the defibrator mill chamber, fibrous wood pulp passes through the sebific duct applying glue in going out the slip pipe, and send into by steam pressure and to carry out pneumatic conveying drying in the pipe drier and handle, send in the press hot-forming after on spreading machine, mating formation then, it is characterized in that: described waste and scrap is the juggle that contains iron nail, waste and old furniture-plates, and its shattering process comprises:

Adopt roll squeezer that it is squeezed, rubs and shears, impact through hammer mill again, make wood materials be broken into particle and make that impurity in the wood materials gets loose, iron nail separates;

Crushing material through the vibratory sieve screening, is removed tiny sandstone, dust impurity;

In magnetic separator, remove the ferrous metal particle;

In separator, rely on the pneumatic floating sorting, remove impurity such as sandstone, nonferrous metal.

2, require the 1 described production method of utilizing waste and old wood to prepare medium density fibre board (MDF) according to the wooden fork profit, it is characterized in that: the linear pressure of described roll squeezer pressure roller is greater than 200kg/cm.

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