Processing technology for manufacturing board by utilizing crop straws

A technology for crop straw and processing technology, which is applied in the direction of wood processing appliances, manufacturing tools, pretreatment of molding materials, etc. Yield and processing efficiency, the effect of overcoming the moisture content problem and improving the moisture content

Active Publication Date: 2010-03-17
SHANGHAI COMPAK ENVIRONMENTAL PROTECTION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many defects in this hot-pressing process: First, the steam exhausting time is long, because the thermal conductivity of crop straw is small, no matter it is hot-pressing or steam exhausting, it can only be done by steam, and the steam exhausting time is about three times that of the whole process. 1 / 1, resulting in low production efficiency; second, the slab often appears "fried board" or bubbles during the steam exhaust process. Excessive steam exhaust speed is very easy to produce this phenomenon, especially when producing high-density plates, resulting in a decrease in product qualification rate and an increase in cost
However, the moisture content of the board produced by this method is low, which leads to serious warping and deformation of the product, long hot pressing process time, and other defects such as poor physical and chemical properties.
The key to the production of crop straw boards is whether the relationship between moisture content, sizing amount, product quality and production cost can be well solved in the production process of crop straw boards; the third is that it is difficult to overcome the density bottleneck, which makes it difficult to overcome the strength bottleneck
As mentioned above, due to the existence of moisture content and steam exhaust problems, it is impossible to produce qualified medium-high density and thick (18mm and above) crop straw plates, so it is difficult for crop straw plates to break through the density limit, resulting in poor physical and chemical properties of the plates. Even if the medium and high density boards are made, they do not have any market competitiveness because of the high cost
As a result, the production of medium-to-high density and thick crop straw plates is limited, and the current crop straw plates can only be used in some low-end occasions

Method used

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  • Processing technology for manufacturing board by utilizing crop straws
  • Processing technology for manufacturing board by utilizing crop straws
  • Processing technology for manufacturing board by utilizing crop straws

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Material preparation:

[0056] Wheat straw (origin: Chuzhou, Anhui) is pulverized by a hammer mill. The diameters of the double screens of the pulverizer are 6mm and 6mm respectively. The moisture content of the crushed straw material is 12.5%. In a blender, atomize isocyanate (PMDI) adhesive and mix evenly with crushed wheat straw. The adhesive used was Huntsman Suprasec 5005, and the sizing amount was 3.5% of the dry weight of the crushed wheat straw.

[0057] (2) Pavement preloading:

[0058] To manufacture wheat straw boards with a homogeneous structure with a thickness of 20mm, take a sanding margin of 1.2mm, that is, set the thickness of the unsanded board produced by the press to 21.2mm, and set the density of the unsanded board to 820Kg / m 3 . According to these parameters, the raw materials after sizing are spread evenly on the metal backing plate, and the backing plate is treated with a release coating, and a release agent is sprayed on the upper surfac...

Embodiment 2

[0072] (1) Material preparation:

[0073] Wheat straw (place of origin: Guannan County, Lianyungang, Jiangsu Province) is pulverized for the first time by a hammer mill. The diameters of the double screens of the pulverizer are 8mm and 6mm respectively. , take 60% of it as the core material for board making. 40% of the pulverized material is pulverized by a hammer mill (screen diameters are 3mm and 3mm respectively) to be used as the surface layer material for board making. The moisture content of the surface material used for board making is 14.5%, and the moisture content of the core layer material used for board making is 10%. The surface layer material and the core layer material are sizing separately. In the mixer machine, the isocyanate (PMDI) adhesive is atomized and mixed with the surface layer material evenly, and then the core layer material is uniformly sized. The adhesive used was Huntsman Suprasec 5005, the sizing amount of the surface layer was 3.5% of the dry ...

Embodiment 3

[0086] (1) Material preparation:

[0087] Corn stalk husks (origin: Harbin, Heilongjiang) are pulverized for the first time by a hammer mill. The diameters of the double screens of the pulverizer are 10mm and 10mm respectively, and 60% of the pulverized raw materials are used as the core material for board making. 40% of the pulverized material is then pulverized by a hammer mill (the screen diameters are 3mm and 4mm respectively) to be used as the surface layer material for board making. The moisture content of the surface material used for board making is 15.5%, and the moisture content of the core layer material used for board making is 11%. The surface layer material and the core layer material are sizing separately. In the mixer machine, the isocyanate (PMDI) adhesive is atomized and mixed with the surface layer material evenly, and then the core layer material is uniformly sized. The adhesive used was Huntsman Suprasec 5005, the sizing amount of the surface layer was 3%...

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Abstract

The invention relates to processing technology for manufacturing a board by utilizing crop straws, which is characterized in that the processing technology comprises the steps of: a, preparing materials, namely performing processing treatment on the crop straws to prepare needed raw materials, and evenly mixing the raw materials with an adhesive; b, paving the materials namely paving the mixed materials to form a board blank to be hot-pressed; c, carrying out hot pressing on the board, namely molding the board blank into the needed board with the hot-pressing board; dividing the hot-pressing process on the board blank into a compression stage, a molding stage and a tempering treatment stage, wherein a molding temperature set value in the molding stage is lower than a compression temperature set value in the compression stage, and a tempering temperature set value in the tempering treatment is between the molding temperature set value and the compression temperature set value; and d, post processing, namely carrying out post processing on the board after the hot pressing to obtain a finished product. Therefore, the processing technology has no technological design of the conventional steam release stage, can solve the problems of layering, board bursting and bubbling in the process of manufacturing the board, save the time, and improve the rate of finished products and processing efficiency..

Description

Technical field: [0001] The invention relates to a processing technology in a method for making boards from crop stalks, in particular to a processing technology with variable temperature and controllable temperature during hot pressing. Background technique: [0002] With the shortage of wood resources and the requirements of environmental protection, the price of wood-based panels is becoming more and more expensive, and countries have successively issued a series of laws and regulations to protect forest resources. It is the natural choice for the plank market to survive and seek development. As a by-product of agricultural production, crop straw has a large output and high cellulose and lignin content, so it has become the material of choice to replace wood-based panels. Reduce straw burning, reduce deforestation, avoid indoor formaldehyde pollution, and improve people's quality of life. So far, the domestic production capacity of 230,000 cubic meters of crop straw pan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/02B27N3/08B27N3/10B27N1/00B27N1/02B27N3/18
Inventor 夏定权薛村禾
Owner SHANGHAI COMPAK ENVIRONMENTAL PROTECTION EQUIP CO LTD
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