CN101244580B - Method for producing antennaria dioica flakeboard - Google Patents

Abstract

The invention discloses a technology for using a gramineous plant- Lespedeza cuneata to produce shaving boards, which comprises the following steps: using a piece of special wood shaving equipment to make the discarded Lespedeza cuneata into long and thin wood shavings, which are evenly mixed in a glue blender together with additives like adhesive, curing agent, and waterproofing agent after appropriate treatments; then, laying the Lespedeza cuneata wood shavings blended with glue into a slab with a certain thickness and even density, and through the procedures of prepressing and hot pressingwith a hot press, obtaining the Lespedeza cuneata shaving board in accordance with the national standards concerning shaving boards. By utilizing the adhesives like urea-formaldehyde resin glue and Triarrhena (silvergrass) plants to manufacture shaving boards, the shaving board manufacturing technology has the advantages of simple and feasible manufacturing method, low manufacturing costs, and high strength of the shaving board; furthermore, the technology in the invention overcomes the problem of high expansion rate of the water-absorbing thickness in the shaving boards made from straw raw materials, and the water-absorbing thickness expansion rate, physical mechanics performance as well as the release quantity of free formaldehyde all meet the requirements in relevant national standards.

Description

The production method of antennaria dioica flakeboard

One, technical field

The invention discloses a kind of gramineae plant-reed grass that utilizes and make the production method of particieboard.Wood shavings drying, the glue mixing of making through reed of special use grass wood shavings manufacturing equipment, mat formation, the mode of hot pressing makes particieboard.Its major technique is characterized as: utilize adhesive production reed (awns) genus particieboards such as Lauxite.

Two, technical background

Along with the develop rapidly of national economy and the raising of living standards of the people; the consumption figure of timber is in continuous growth; and the supply of resource is descending; there is structural inconsistency in the timber resources of China; make timber resources in short supply; particularly country implements wildwood protected project, the upper and middle reaches of the Yangtze River and the Yellow River forbid and limit cut down timber after, annual timber insufficiency of supply-demand reaches 6,000 ten thousand m ³, utilizing all utilizable non-timber resource exploitation wood-based plates is forward positions of countries in the world research, also is the approach of necessity of the artificial board industry development of China.The Poyang Lake in China Jiangxi, the ground such as Dongting Lake in Hunan, reed grass of growing a large amount of, reed grass plant belongs to perennial rhizome dogstail, the tall and big tool marrow of cane, reed grass asexual multiplication ability is very strong, the productivity height, the lake region per unit area yield can reach 15-30t/hm ², reed grass also can carry out generative propagation with seed as required, and reed grass growth in the coming year after the felling is better, so the output height, but continuous utilization can be satisfied the large batch of demand of particieboard factory fully.Result of the test shows that the shaving shape that reed grass makes is good, intensity height, the antennaria dioica flakeboard stable performance of producing with adhesive such as Lauxites, the intensity height, variability is little, can match in excellence or beauty with the particieboard of timber production, and its product can be applicable to fields such as furniture, construction and decoration, packing.

Three, summary of the invention

1. Fa Ming purpose

The objective of the invention is to the discarded reed grass resource in China lake region is used.In the ecological environment and the ecological balance of protection lake region, improve value, the local farmers' income of increase and the job opportunity of reed grass.Can utilize simultaneously the raw material of lake region beach plantation reed grass of China, alleviate China's timber resources scarcity, protection wildwood resource as Wood-based Panel Production such as particieboards.Open urea-formaldehyde resin adhesive and produce the new page of stalk class particieboard.

2. technical scheme

What the present invention relates to is to utilize the technological invention that gramineae plant-reed grass is produced particieboard.

1, the production method of antennaria dioica flakeboard is characterized in that its production craft step branch:

1. the preparation of reed grass wood shavings: reed grass is chipped earlier or cut off, again by the broken crusher machine of reed grass meal, obtain reed grass wood shavings of higher yield and better form, screen then and pneumatic separation, remove meticulous dust and part marrow core in the wood shavings, excessive wood shavings are broken again through sander, the size of reed of making grass wood shavings is more elongated than the wood shavings of ordinary particle board, and the screening value of wood shavings is: account for 20-35%, account for 40-25%, the 32-25% that accounts for less than 30 orders greater than 60 orders, account for 8-15% less than 60 purposes less than 10 purposes greater than 30 orders greater than 10 purpose wood shavings;

2. the reed after sorting grass wood shavings are dry in drying machine, the whole moisture content of dried reed grass wood shavings is 2-5% than the moisture content of wooden shavings is low, and reed grass particle drying temperature is 150-190 ℃;

3. dried reed grass wood shavings mix and stir with additives such as adhesive, waterproofing agent, paraffin emulsifiers in glue mixer through suitable wet process.The applied amount of adhesive is 12-16% (ratio of the quality of the solid masses of resin and over dry reed grass wood shavings), and the paraffin emulsifier consumption is the 1-2% ratio of over dry reed grass wood shavings quality (quality of solid paraffin with); The addition 0.8-1.5% of the curing agent ratio of the solid masses of resin (solid masses of curing agent with); These additives are finished this operation in glue mixer with after the uniform mixing of reed grass;

4. the reed after glue mixing grass wood shavings adopt mechanical spreading machine, airflow pavement machine or machinery and air-flow spreading machine to mat formation, and the slab density after mating formation, thickness are evenly and through the preformer precompressed;

5. adopt individual layer periodic or continous way hot press and multi-daylight press compacting antennaria dioica flakeboard, the hot pressing temperature during hot pressing is 160-250 ℃, and hot pressing time is 20-50s/mm, and hot pressing pressure is 2-5MPa;

6. finish that antennaria dioica flakeboard slab after the hot pressing cools off, operation such as cutting edge and sanding makes antennaria dioica flakeboard.

The present invention is optimized in operations such as wood shavings preparation, sorting, drying, glue mixings according to the characteristics of gramineae plant: the thin and MOR height of long slab of the size of wood shavings; Sub-elect the high marrow core of water imbibition; Reduce the whole moisture content of reed grass particle drying, make the cell of reed grass produce bigger drying shrinkage, cell produces the moisture absorption and suction lags behind; Reed grass wood shavings are carried out suitable wet process; Solve common urea-formaldehyde resin adhesive and can not produce the high difficult problem of thickness swelling rate of gramineae plant particieboard and gramineae plant production particieboard.The thickness swelling rate of the antennaria dioica flakeboard of producing with this method and the requirement that other physical mechanics property all can arrive national particieboard standard.

Advantage of the present invention: utilize reed grass of the no value of lake region to do the high added value particieboard product that suitable process for producing goes out to meet national particieboard standard-required, solved common urea-formaldehyde resin adhesive and can not produce a gramineae plant particieboard and the high difficult problem of gramineae plant production particieboard thickness swelling rate.The manufacture method of this invention is simple, and the antennaria dioica flakeboard cost of making is low, and intensity is big, and product can be applied in industries such as furniture, construction and decoration, packing.

Four, the specific embodiment

Embodiment 1:

Describe the present invention below in conjunction with example, but given example is not limit in invention.

1. pulverizer is smashed reed grass, filter out marrow core, silt, tiny raw material etc., reed of making grass wood shavings are of a size of greater than 10 purposes and are 30.4%, are 39.1%, are 21.8%, are 8.7% less than 60 purposes less than 30 purposes greater than 60 orders less than 10 purposes greater than 30 orders;

2. be 2% with reed grass particle drying to whole moisture content, baking temperature is 160 ℃, and adjusting reed grass wood shavings moisture content is 5%;

3. adopt the Lauxite jelly, applied amount is 14%, and the paraffin emulsifier consumption is 1%, and the addition of curing agent is 1.5%;

4. to mat formation into density be 0.80g/cm to the reed after glue mixing grass wood shavings ³, 0.75g/cm ³, 0.70g/cm ³Slab;

5. adopt individual layer periodic hot press compacting antennaria dioica flakeboard, the hot pressing temperature during hot pressing is 180 ℃, and hot pressing time is 24s/mm, and hot pressing pressure is 3MPa;

6. the sheet material after the hot pressing cool off at normal temperatures, cutting edge, deposit 48 hours after, measure the performance of antennaria dioica flakeboard.

The antennaria dioica flakeboard performance indications are as follows:

Plate density 0.80g/cm ³0.75g/cm ³0.70g/cm ³

Elastic modelling quantity 4139MPa 3815MPa 3431MPa

MOR 29.2MPa 26.1MPa 23.0MPa

Internal bond strength 0.84MPa 0.79MPa 0.61MPa

2 hours thickness swelling rate 5.7 (%) 5.8 (%) 7.9 (%)

Claims (1)

1. the production method of antennaria dioica flakeboard is characterized in that its production craft step branch:

1. the preparation of reed grass wood shavings: reed grass is smashed by pulverizer, screen out marrow core, silt, tiny raw material, the reed that makes grass wood shavings are of a size of greater than 10 purposes and are 30.4%, are 39.1%, are 21.8%, are 8.7% less than 60 purposes less than 30 purposes greater than 60 orders less than 10 purposes greater than 30 orders;

2. the drying of reed grass wood shavings: is 2% with reed grass particle drying to whole moisture content, and baking temperature is 160 ℃;

3. the glue mixing of reed grass wood shavings: adjusting reed grass wood shavings moisture content is 5%; Adopt urea-formaldehyde resin adhesive, applied amount is 14%, and the paraffin emulsifier consumption is 1%, and the addition of curing agent is 1.5%;

4. to mat formation into density through spreading machine be 0.80g/cm to the reed after glue mixing grass wood shavings ³, 0.75g/cm ³, 0.70g/cm ³Slab;

5. adopt individual layer periodic hot press compacting antennaria dioica flakeboard, the hot pressing temperature during hot pressing is 180 ℃, and hot pressing time is 24s/mm, and hot pressing pressure is 3MPa;

6. finish that antennaria dioica flakeboard slab after the hot pressing cools off, cutting edge, sanding, make antennaria dioica flakeboard.