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Internal and external molded wood-bamboo hollow plate and manufacturing method thereof

A manufacturing method and technology for hollow panels, which are used in the manufacture of tools, flat products, other household appliances, etc., can solve the problems of unreachable water expansion rate, low longitudinal static bending strength, sheet fracture, etc., so as to improve the water absorption expansion rate, Improve sound absorption performance and eliminate the effect of broken boards

Active Publication Date: 2013-07-31
ZHEJIANG FORESTRY ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The longitudinal static bending strength of the plate is low, only 10-20% of the transverse bending strength; the main defect that the plate is easy to break along the longitudinal extrusion section has not been improved
The water absorption expansion rate of the thickness of the board is good, but the water absorption expansion rate in the length direction does not meet the 15% requirement stipulated by the national forestry industry standard

Method used

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  • Internal and external molded wood-bamboo hollow plate and manufacturing method thereof
  • Internal and external molded wood-bamboo hollow plate and manufacturing method thereof
  • Internal and external molded wood-bamboo hollow plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] ①Material preparation: process large-sized wood raw materials into shavings with a thickness of 1-3mm;

[0086] ② Drying: Dry the shavings to a moisture content of 3-8%.

[0087] ③Screening: Screen the shavings and scraps, and send the qualified raw materials with a thickness of 1-3mm, a length of 5-30mm, and a width of 1-10mm into the hollow board forming line;

[0088] ④Sizing: Apply glue evenly to the wood scraps, the adhesive is a liquid glue with a solid content greater than 52%, and the amount of glue is 6-10% of the weight of the wood scraps.

[0089] ⑤Extrusion molding: use a vertical extrusion machine with a hot-pressing temperature of 140-180°C to produce a formed hollow plate with a thickness of 28mm at a rate of 0.4-0.7m / min. Hollow plate cross-section selection Figure 14 The structure shown, using Figure 19 The extrusion head shown is extruded.

[0090] ⑥Post-processing: The produced hollow boards are cut into finished products with a specified format...

Embodiment 2

[0092] ①Material preparation: use bamboo shavings with a thickness of 1-3mm;

[0093] ② Drying: Dry the bamboo shavings to a moisture content of 3-5%.

[0094] ③Screening: Screen the bamboo shavings, and the qualified ones are sent to the hollow panel forming line.

[0095] ④Sizing: evenly sizing the bamboo shavings, the adhesive is a liquid glue with a solid content greater than 52%, and the sizing amount is 8-12% of the weight of the bamboo shavings.

[0096] ⑤Extrusion molding: A horizontal extrusion machine is used, the hot pressing temperature is 140-180°C, and the forming hollow plate with a thickness of 35mm is produced at a rate of 0.4-0.6m / min. Hollow plate cross-section selection Figure 13 The structure shown, using Figure 21 The extrusion head shown is extruded.

[0097] ⑥Post-processing: The produced hollow boards are cut into finished products with a specified format by the trimming machine.

Embodiment 3

[0099] ①Material preparation: Wheat straw scraps are used, and the length should be ≤30mm;

[0100] ② Drying: Dry the wheat straw scraps to a moisture content of 3-8%.

[0101] ③ Screening: Screen the wheat straw scraps, remove the long materials with a length greater than 30mm, and send the qualified ones to the hollow plate forming line.

[0102] ④ Glue sizing: evenly sizing the wheat straw scraps, the adhesive is a liquid glue with a solid content greater than 52%, and the sizing amount is 8-12% of the weight of the wheat straw scraps.

[0103] ⑤Extrusion molding: use a vertical extruder with a hot-pressing temperature of 140-180°C to produce a formed hollow plate with a thickness of 38mm at a rate of 0.4-0.5m / min. Hollow plate cross-section selection image 3 The structure shown, using Figure 20 The extrusion head shown is extruded.

[0104] ⑥Post-processing: The produced hollow boards are cut into finished products with a specified format by the trimming machine.

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Abstract

The invention relates to an internal and external molded wood-bamboo hollow plate with the characteristics of high strength, remarkably improved swelling rate of water absorption, good sound isolation and heat insulation effect, and high decorating effect of arc molding on the surface. According to the technical scheme of the invention, the internal and external molded wood-bamboo hollow plate comprises a hollow plate body, wherein the hollow plate body is formed by overlapping and bonding a plurality of chip units, each chip unit is formed by extruding and bonding wood-bamboo chips and an adhesive; the length and height of each chip unit are identical to the width and thickness of the hollow plate respectively; and a plurality of holes are formed in the hollow plate body. The hollow plate is characterized in that at least one row of notches and bumps are staggered on each chip unit, and all notches and bumps between two adjacent chip units are embedded one another and bonded to form the molded hollow plate. The method for manufacturing the internal and external molded wood-bamboo hollow plate comprises the following steps: 1) preparing materials; 2) drying; 3) screening; 4) applying the adhesive; and 5) extruding and molding.

Description

technical field [0001] The invention relates to a wood-based panel and a manufacturing method thereof; in particular, a hollow board made of wood or bamboo material formed inside and outside and a manufacturing method thereof. Background technique [0002] Wood and bamboo forming hollow boards (including artificial hollow particle boards) are wastes such as branches, truncations, boards, wood and bamboo chips, shavings and other wastes produced during the harvesting, processing and utilization of wood and bamboo, as well as small-diameter wood and bamboo and waste wood and bamboo. As raw materials, agricultural residues such as wheat straw or rice straw scraps can be added appropriately, and the internal and external molding is made by production processes such as chipping, screening, drying, sizing, and continuous extrusion and heating in a special mold machine. Hollow sheet. [0003] The manufacture and production of wood and bamboo shaped hollow panels can turn waste int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/04B27D1/08B27L11/02B27N3/28
Inventor 刘乐群
Owner ZHEJIANG FORESTRY ACAD
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