Method for manufacturing structural timber by sheet lamination of fast growing wood

A production method and technology for structural materials, which are applied to flat products, wood processing appliances, household components, etc., to achieve the effects of shortening hot pressing time, good shape stability of products, and low cost

Inactive Publication Date: 2012-12-12
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low density, low strength and high brittleness of fast-growing small-diameter timber, there is a certain gap compared with natural forest timber, so there is a lack of sufficient understanding of its processing and utilization potential, which greatly affects the utilization value and economic benefits of small-diameter timber, and dampens forest farmers. enthusiasm

Method used

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  • Method for manufacturing structural timber by sheet lamination of fast growing wood
  • Method for manufacturing structural timber by sheet lamination of fast growing wood
  • Method for manufacturing structural timber by sheet lamination of fast growing wood

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The small-diameter fast-growing poplar, fir, eucalyptus or masson pine raw material section is first processed into a 1.5-4.0mm thick veneer by a rotary cutting machine, and the veneer is dried naturally or artificially to a moisture content of 2%-10%. After coating, such as: PF, phenolic resin for double-sided coating of veneer, the amount of coating is 300g / m 2 ~440g / m 2 Finally, it is paved into slabs by machinery or supplemented by manual work. After the slabs are aged, they are finally sent to a combined hot press machine with a side steam spraying mechanism. In the hot press, the slab is compressed first, and then steamed laterally. The steam pressure is 0.3-0.9MPa, and the steaming time is 5-25s. Suction, absorb the condensed water vapor in the slab, and finally enter the ordinary pressing stage, so as to produce LVL structural materials with a thickness of 20-200mm or more, and the hot-pressing time is only 10-20s / mm, which is only the traditional hot-pressing ...

Embodiment 2

[0015] Small-diameter fast-growing poplar, fir, eucalyptus or masson pine raw materials, first cut into large shavings by a flaking machine, and then dry the shavings to a moisture content of 2% to 8% and apply adhesives, such as: MUF, MUF sizing amount 8% ~ After 12%, then realize the orientation structure of the slab with the help of a specific paving mechanism, and finally send it into a combined hot press machine with a side steam spraying mechanism. In the hot press, the slab is compressed first, and then steamed laterally. The steam pressure is 0.3-0.9MPa, and the steaming time is 5-25s. Suction, absorbing the condensed water vapor generated in the slab, and finally entering the stage of high-pressure and low-pressure ordinary pressing, so as to produce OSB structural materials with a thickness of 25-40mm or more, and the hot-pressing time is only 5-12s / mm, Only 1 / 5 to 1 / 12 of traditional hot pressing.

Embodiment 3

[0017] Small-diameter fast-growing poplar, Chinese fir, eucalyptus, masson pine and other raw material segments are first cut into strip-shaped shavings by a flaker, or the shredded veneers produced by the above-mentioned tree species in plywood rotary cutting are broken into single pieces of a certain length and width. Slats, then the shavings or veneer strips are dried to a moisture content of 2% to 8%, and then an adhesive such as: MDI is applied, after the amount of glue is 3% to 8%, and then the directional structure of the slab is realized by means of a specific paving mechanism , and finally sent to a combined heat press with a side steaming mechanism. In the hot press, the slab is compressed first, and then steamed laterally. The steam pressure is 0.3-0.9MPa, and the steaming time is 5-25s. Suction, absorb the condensed water vapor in the slab, and finally enter the ordinary pressing stage, so as to produce PSL structural materials with a thickness of 20-60mm or more, ...

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Abstract

The invention relates to a method for manufacturing structural timber by the sheet lamination of fast growing wood, which is characterized by comprising the following processing steps of: 1, machining fast growing wood (such as fast growing poplar, fir, eucalyptus or masson pine) into veneers or large wood shavings, and drying the veneers or the large wood shavings until the water content is 2-10%; 2, gluing the veneers or the large wood shavings, wherein an adhesive can be phenol formaledlyde (PF), urea formaldehyde (UF) or diphenyl-methane-diisocyanate (MDI) and depends on the veneer type and the adhesive type; 3, laminating and paving the veneers or the large wood shavings into plate blanks, and making orienting structures of the plate blanks by means of a paving mechanism; and 4, feeding the plate blanks into a combined type hot press with a lateral steam injection mechanism, compressing the plate blanks in the hot press, then directly injecting steam to the plate blanks from the lateral sides by means of the lateral steam injection mechanism at the preliminary stage of hot compression, and finally compressing at high pressure and then compressing at lower pressure in the common compression stage to obtain laminated veneer lumber (LVL) type structural timber. The invention has the advantages of short hot compression time, high production rate, energy saving, low cost and high product shape stability, and can be used for manufacturing thick laminated lumber with a thickness of 20 mm or above.

Description

technical field [0001] The invention relates to a method for fabricating structural materials by sheet-like lamination of fast-growing materials, which belongs to the field of wood-based panel manufacturing. Background technique [0002] At present, the global timber resources are undergoing a major transition from mainly using natural forests to plantation forests. The research and processing and utilization of plantation forest materials are a hot spot in the field of wood science in the world. my country is a Shaolin country, and large-scale plantation forests began to be built in the 1960s. Therefore, the supply of timber will mainly rely on plantation forests in the future. The biggest difference between artificial forest wood and natural forest wood is the same diameter tree species. The proportion of juvenile wood in artificial forest trees is higher than that in natural forests. Resources are fully and rationally utilized. Fast-growing poplar, fast-growing Chinese ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/10B27N3/20
Inventor 徐咏兰金菊婉周定国梅长彤周晓燕顾景亮张瑞芳华毓坤李显成
Owner NANJING FORESTRY UNIV
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