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Extrusion head of wood and bamboo forming hollow board extruder

A technology of extrusion head and hollow board, which is applied in the direction of wood processing appliances, household components, flat products, etc., can solve the problems of unimproved longitudinal static bending strength, unsuitable application of two-dimensional extrusion head, and damage of mold deformation, etc. To achieve the effect of increasing connection fastness, improving bonding strength, and eliminating broken boards

Active Publication Date: 2011-12-14
ZHEJIANG FORESTRY ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material of the hollow particle board manufactured by this technology is extruded according to the corrugated lines. Although the glued surface between the crushed material units is changed from a flat surface to a curved surface when the extrusion head is extruded, when a vertical force is applied to the surface of the board, the board crushed material unit Shear misalignment will still occur between them, and the large-format sheet is easy to break along the corrugated line during handling, and the longitudinal static bending strength has not been improved.
At the same time, because the cross-section of the two-dimensional corrugated end face of the extrusion head is semicircular, when extruding the raw material, its thrust direction is at a divergent angle of 0 to 90°, resulting in a large lateral thrust of the mold. Force, resulting in mold deformation damage
The two-dimensional extrusion head with a semicircular cross-section cannot be applied in actual production

Method used

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  • Extrusion head of wood and bamboo forming hollow board extruder
  • Extrusion head of wood and bamboo forming hollow board extruder
  • Extrusion head of wood and bamboo forming hollow board extruder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] ①Material preparation: process large-sized wood raw materials into shavings with a thickness of 1-3mm;

[0059] ② Drying: Dry the shavings to a moisture content of 3-8%.

[0060] 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;

[0061] 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.

[0062] ⑤Extrusion molding: adopt a vertical extrusion machine, the extrusion heating temperature is 140-180°C, and the forming hollow plate with a thickness of 28mm is produced at a rate of 0.4-0.7m / min. Hollow plate cross-section selection Figure 5 The structure shown, using image 3 The extrusion head shown is extruded.

[0063] ⑥Post-processing: The produced hollow boards are cut into finished products with a speci...

Embodiment 2

[0065] ①Material preparation: use bamboo shavings with a thickness of 1-3mm;

[0066] ② Drying: Dry the bamboo shavings to a moisture content of 3-5%.

[0067] ③Screening: Screen the bamboo shavings, and the qualified ones are sent to the hollow panel forming line.

[0068] 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.

[0069] ⑤Extrusion molding: A horizontal extrusion machine is used, the extrusion heating 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 24 The structure shown, using Figure 4 The extrusion head shown is extruded.

[0070] ⑥Post-processing: The produced hollow boards are cut into finished products with a specified format by the trimming machine.

Embodiment 3

[0072] ①Material preparation: Wheat straw scraps are used, and the length should be ≤30mm;

[0073] ② Drying: Dry the wheat straw scraps to a moisture content of 3-8%.

[0074] 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.

[0075] 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.

[0076] ⑤Extrusion molding: adopt a vertical extrusion machine, the extrusion heating temperature is 140-180°C, and the forming hollow plate with a thickness of 38mm is produced at a rate of 0.4-0.5m / min. Hollow plate cross-section selection Figure 8 The structure shown, using Figure 7 The extrusion head shown is extruded.

[0077] ⑥Post-processing: The produced hollow boards are cut into finished products with a specified format by th...

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Abstract

The invention relates to an extrusion head for manufacturing a wood and bamboo hollow board formed internally and externally in an extrusion forming mode, and aims to provide an extrusion head for manufacturing a wood and bamboo hollow board which is high in static bending strength, insusceptible to longitudinal cracking and high in the performance of a longitudinal water absorption expansion ratio, and the extrusion head is favorable for prolonging the service life of a die. In the technical scheme, in the extrusion head for the wood and bamboo formed hollow board extruder has a plurality of slide holes which are in sliding fit with a core column in a die pressing gap. The extrusion head is characterized in that: at least one row of recesses and bulges which are arranged mutually in a staggered mode are distributed on the end face of the extrusion head; projections, which are perpendicular to the upper surface of the extrusion head, of the recesses and the bulges are in a trapezoid or an arc shape; two rows or more than two rows of recesses and bulges which are arranged transversely are distributed on the end face of the extrusion head; the same row of recesses and bulges are arranged mutually in a staggered mode, and the recesses and the bulges are formed at positions of aligning from top down between the two adjacent rows; and a plurality of long slots which are parallel to axes of the slide holes are formed on wall parts of the slide holes in the extrusion head.

Description

technical field [0001] The invention relates to a hollow wood-based panel molding and extrusion equipment; in particular, an extrusion head for manufacturing wood and bamboo inner and outer hollow panels by extrusion molding. Background technique [0002] The manufacture and production of wood and bamboo shaped hollow boards (including artificial hollow particle boards) can turn waste into resources, and then obtain artificial board products with superior performance. This type of product has the advantages of stable performance, low density, heat preservation, heat insulation, sound insulation, and saving raw materials. Door core panels, building interior walls, floors, furniture manufacturing and other fields. Therefore, this type of product is recyclable and biodegradable, and has great economic value and social benefits for building a new industrial model that is resource-saving, environment-friendly, and recyclable, and promoting the upgrading of the traditional wood-b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N3/28
Inventor 刘乐群
Owner ZHEJIANG FORESTRY ACAD
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