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Technology for increasing pre-pressing strength of formaldehyde-free artificial board by using hot melt adhesive

A technology of hot-melt adhesives and wood-based panels, which is applied in the direction of manufacturing tools, wood processing appliances, applications, etc., can solve problems that affect production line production capacity, take a long time, and cannot be formed, so as to improve gelatinization effect, increase efficiency, and increase production capacity. Effect

Inactive Publication Date: 2019-01-18
李杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the process of making slabs, it is basically impossible to form, and can only rely on the support of the liner to prevent loosening and loss of shape, so that the pressing process can only use intermittent pressing methods. The intermittent pressing method takes a long time, which affects the production capacity of the production line. Usually The production line of the same scale is only one-third of the production capacity of the conventional urea-formaldehyde glue production line, or even less

Method used

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  • Technology for increasing pre-pressing strength of formaldehyde-free artificial board by using hot melt adhesive
  • Technology for increasing pre-pressing strength of formaldehyde-free artificial board by using hot melt adhesive
  • Technology for increasing pre-pressing strength of formaldehyde-free artificial board by using hot melt adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In step one, crop stalks containing 80% kenaf stalks are used as raw materials, and then the crop stalks are compressed and packaged for storage. Coarsely crushed crop stalks are dried by a tumble dryer so that the moisture content is within the range of 9% to 17%.

[0029] The dried crop stalks are then passed through wind selection and other equipment to remove impurities such as iron and stones, and then enter the fine grinder to be crushed to a fineness of 10-60 mesh and sieved. After sieving, the crop stalks with a fineness of 10-30 mesh The stalks are sent to the core layer silo, and the 30-60 mesh crop stalks are sent to the surface layer silo.

[0030] The crop stalks in the core layer silo and the surface layer silo are weighed separately, and their moisture content is measured by a moisture tester, and sent to different mixers respectively, and the glue spraying device is controlled by PLC to spray glue, according to Corresponding weight controls the amount o...

Embodiment 2

[0041] In step one, jute stalks are used as raw materials, and then the jute stalks are compressed and packaged for storage. Coarsely crushed jute stalks are dried by a tumble dryer so that their moisture content is within the range of 9% to 17%.

[0042] The dried jute stalks are then passed through wind selection and other equipment to remove impurities such as iron and stones, and then enter the fine grinder to be crushed to a fineness of 10-60 mesh and sieved. After sieving, the jute stalks with a fineness of 10-30 mesh The stalks are sent to the core layer silo, and the 30-60 mesh jute stalks are sent to the surface layer silo.

[0043] The jute stalks in the core layer silo and the surface layer silo are weighed respectively, and their moisture content is measured by a moisture tester, and sent to different mixers respectively, and the glue spraying device is controlled by PLC to spray glue, according to Corresponding weight controls the amount of glue spraying, and the...

Embodiment 3

[0054] In the first step, hemp crop stalks mixed with kenaf stalks and jute stalks are used as raw materials, and then the hemp crop stalks are compressed and packaged for storage. The coarsely crushed hemp crop stalks are dried by a tumble dryer so that the moisture content is within the range of 9% to 17%.

[0055] The dried hemp crop stalks are then passed through wind selection and other equipment to remove impurities such as iron and stones, and then enter the fine grinder to be crushed to a fineness of 10-60 mesh and sieved. After sieving, the hemp with a fineness of 10-30 mesh The crop stalks are sent to the core layer silo, and the 30-60 mesh hemp crop stalks are sent to the surface layer silo.

[0056] The hemp crop stalks in the core silo and the surface silo are weighed separately, and the moisture content is measured by a moisture tester, and sent to different mixers, and the glue spraying device is controlled by PLC to spray glue. According to the corresponding w...

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Abstract

The invention provides a technology for increasing the pre-pressing strength of a formaldehyde-free artificial board by using a hot melt adhesive. The technology is characterized by comprising the steps that 1, crop stalks are smashed into the fineness of 10-60 mesh, polymer MDI glue accounting for 2-8% of the weight of the crop stalks is added for stirring and mixing, and a stirred mixture is obtained; 2, before the stirred mixture is laid, a layer of sanding powder is laid, then a layer of hot melt adhesive film is laid on the sanding powder, and the stirred mixture is laid on the hot melt adhesive film so as to be used as a plate blank; 3, the plate bland is subjected compression rolling by using a continuous pre-pressing machine under the condition of 250-500 kN / m<2>, a layer of hot melt adhesive film is laid on the upper surface of the plate blank obtained after pre-pressing forming, and then a layer of sanding powder is laid on the hot melt adhesive film on the upper layer; 4, the plate blank is fed into a hot pressing machine, under the conditions that the hot press temperature is 150-220 DEG C, and the pressure is 2400-3800 kN / m<2>, a rough board is formed through hot pressing and solidification, and the artificial board is obtained through aftertreatment.

Description

technical field [0001] The invention relates to the technical field of wood-based panels, in particular to a process for increasing the pre-compression strength of formaldehyde-free wood-based panels by using hot melt adhesive. Background technique [0002] Reducing formaldehyde emission from wood-based panels is the current development trend of the wood-based panel industry. More and more manufacturers have tried to add diphenylmethane diisocyanate (MDI) in the process of manufacturing wood-based panels to improve the performance of wood-based panels. Increase the strength of the wood-based panel, reduce the water expansion rate, make it have a certain fireproof performance, and greatly reduce the formaldehyde emission. However, since MDI itself is not viscous at room temperature, the cross-chain reaction occurs only under specific temperature and pressure conditions and is irreversible. Therefore, in the process of making slabs, it is basically impossible to form, and can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N1/02B27N3/10B27N3/20
CPCB27N1/0209B27N3/10B27N3/203
Inventor 李杰
Owner 李杰
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