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Method for manufacturing hemp stalk composite materials

A technology of composite materials and hemp stalks, which is applied in the field of paving machines, can solve the problems of restricting the development of hemp stalk composite boards, low mechanical strength, and high investment costs, and achieve simplified laying process, high strength, and improved production efficiency Effect

Active Publication Date: 2013-10-30
SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not only complex in process, such as chipping, shaving, grinding, sizing, layering, pre-pressing and hot pressing, but also requires relatively high equipment requirements, such as paving machines, and the investment cost is large; the hemp stalks prepared by it The composite material is density board, the mechanical strength is not high
These factors have greatly limited the development of hemp stalk composite panels.

Method used

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  • Method for manufacturing hemp stalk composite materials
  • Method for manufacturing hemp stalk composite materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use the drum chipper to cut the hemp stalks after peeling off the hemp stalk skin into sheets of certain specifications, and then plan the sheets with a ring planer to grow 10-70mm, 3-20mm wide, and 0.3- 1mm wood shavings; use a spray glue mixer to evenly spray water-soluble phenolic resin glue on hemp shavings, the amount of glue is 10% of the weight of the shavings; use a hot air circulation oven at a temperature of 80°C to dry the shavings after sizing Dry the moisture content of the hemp stalk shavings to below 5%; then evenly add the dried hemp stalk shavings to the paving machine (see figure 1 ) in the hopper 1, the hemp stalk shavings are sent to the conveyor belt 5 rotating at a constant speed by rotating the unloading roller 2 clockwise, and the uniform material roller 3 rotating clockwise evens the hemp stalk shavings on the conveyor belt 5, Make the shifting roller 4 evenly spread the hemp stalk shavings on the material spreading platform 6, according to the ...

Embodiment 2

[0023] A method for preparing a hemp stalk composite material, the method comprising the following steps:

[0024] (1) Raw material preparation: Use a drum chipper to cut the hemp stalks after peeling off the hemp stalk skin into sheets, and then plan the sheets into shavings with a ring-type flaker. The shavings are 10-70mm long and wide. 3-20mm, thickness 0.3-1mm;

[0025] (2) Glue sizing: Spray the water-soluble phenolic resin glue evenly on the shavings with a spray-type glue mixer, and the sizing amount is 3% of the weight of the shavings;

[0026] (3) Drying: dry the shavings after sizing until the moisture content is below 5% at a temperature of 60°C;

[0027] (4) Laying: According to the standard of preparing hemp stalk composite materials with a width of 1m and a thickness of 4mm, the paving of the slab is completed by controlling the feeding speed of the paving machine and the speed of the paving table;

[0028] (5) Preloading: preload the laid slab for 5s under a ...

Embodiment 3

[0031] A method for preparing a hemp stalk composite material, the method comprising the following steps:

[0032] (1) Raw material preparation: Use a drum chipper to cut the hemp stalks after peeling off the hemp stalk skin into sheets, and then plan the sheets into shavings with a ring-type flaker. The shavings are 10-70mm long and wide. 3-20mm, thickness 0.3-1mm;

[0033] (2) Sizing: Spray the water-soluble phenolic resin glue evenly on the shavings with a spray-type glue mixer, and the amount of sizing is 15% of the weight of the shavings;

[0034] (3) Drying: Dry the shavings after sizing until the moisture content is below 5% at a temperature of 90°C;

[0035] (4) Laying: According to the standard of preparing hemp stalk composite materials with a width of 1.5m and a thickness of 30mm, the paving of the slab is completed by controlling the feeding speed of the paving machine and the speed of the paving table;

[0036] (5) Preloading: Preload the laid slab for 20s under...

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Abstract

The invention relates to a method for manufacturing hemp stalk composite materials. The method includes steps of (1), raw material preparation: cutting hemp stalks into sheets by the aid of a chipping machine after skins of the hemp stalks are peeled, and planing the sheets into shavings by the aid of a flaking machine; (2), adhesive application: uniformly spraying water-soluble phenolic resin adhesive on the shavings by the aid of an atomizing adhesive blender; (3), drying: drying the shavings at the temperature of 60-90 DEG C after the adhesive is applied to the shavings so that the moisture content of the shavings is lower than 5%; (4), paving: paving applied adhesive and the dried shavings to obtain plate blanks on a paving machine; (5), pre-pressing: performing pre-pressing for the paved plate blanks under the pressure of 0.2-2MPa for 5-20s; (6), hot-pressing: performing hot-pressing on the paved plate blanks at the temperature of 120-140 DEG C and a rate of 30-60s / mm under the pressure of 1-2MPa to obtain the required hemp stalk composite materials. The quantity of the applied adhesive is 3-15% of the weight of the shavings in the step of adhesive application. Compared with the prior art, the method has the advantages of simple process, low cost, high production efficiency and the like.

Description

technical field [0001] The invention belongs to the field of composite material preparation, in particular to a composite material with hemp stalks as the main raw material, and also to a paving machine. Background technique [0002] Hemp, also known as hemp, is a woody herbaceous plant. The bast fiber part is mainly used in the textile industry, and the seed part is used in the food industry. However, the hemp stalk has not been rationally utilized. Only a very small part is used for wood processing. Incinerated as waste. my country is one of the main industrial hemp growing countries in the world, which produces about 10 million tons of hemp stalks every year. If these hemp stalks can be used to make composite materials, it will not only turn waste into treasure, but also give full play to the performance advantages of hemp stalks. ecological and economic benefits. [0003] Compared with wood, hemp stalks have a lower bulk density (the density is only 0.25g / cm 3 Left and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/08B27N3/18B27L11/02
Inventor 曹凯
Owner SHANGHAI GENIUS ADVANCED MATERIAL (GRP) CO LTD