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Compression-molded articles of vegetable material

A compression molding, plant-based technology, used in applications, thin material handling, household components, etc.

Active Publication Date: 2013-05-15
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, wooden boards are not suitable for precision processing because the size of the pulverized materials used as raw materials varies greatly.
Moreover, since the casings of electronic equipment such as notebook computers are required to have the flame retardancy specified by the UL standard, it is difficult to use wooden boards for the casings of electronic equipment.

Method used

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  • Compression-molded articles of vegetable material
  • Compression-molded articles of vegetable material
  • Compression-molded articles of vegetable material

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0027] figure 1 It is a flowchart showing the manufacturing method of the compression-molded article of the first embodiment of the present invention, figure 2 It is a schematic diagram showing this manufacturing method step by step.

[0028] First, wood or bamboo (hereinafter referred to as "wood, etc.") as a raw material is pulverized to obtain a pulverized product (hereinafter also referred to as "wood powder") having a particle diameter (average particle diameter) of, for example, 5 to 100 μm (step S11) . The type of wood or bamboo used as a raw material is not particularly limited, and the heartwood or skin of cedar, cypress, beech, sycamore, zelkova, maple, mulberry, camphor, oak, elm, bamboo, etc. can be used. In addition, ground materials such as multiple types of wood may be mixed and used.

[0029] In order to ensure processing accuracy and uniformity when manufacturing a case of an electronic device, it is preferable to set the average particle diameter of the ...

no. 2 approach

[0055] Figure 5 It is a flowchart showing the manufacturing method of the compression-molded article of 2nd Embodiment of this invention.

[0056] First, a tree or bamboo as a raw material is pulverized to obtain a pulverized product having an average particle diameter of about 500 μm (step S21 ).

[0057] Next, a flame retardant is impregnated on the surface of the pulverized product (step S22). For example, the pulverized material is immersed in an aqueous solution of a boron-based flame retardant to impregnate the surface of the pulverized material with the flame retardant. In this case, it is only necessary for the flame retardant to enter the surface of the pulverized product relatively shallowly, and the pulverized product can be immersed in the flame retardant for a short time.

[0058] Next, the pulverized material impregnated with the flame retardant is put into a mold, and a press molding process is performed (step S23). The mold temperature in the pressure moldi...

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Abstract

[Problems] Provided is a compression-molded product employing a plant material, using no or little petroleum-based resins, having high mechanical strength and thus being suitable for a housing of an electronic device, and a manufacturing method thereof. [Means of Solving] First, wood or bamboo is crushed to obtain wood powder with an average grain size of 5 µm to 100 µm. Next, the wood powder is put in a first mold 11, and a first compression molding step is carried out under the conditions that, for example, a temperature is 160°C and a pressure is 30 MPa. Thus, a temporary molded body 12 is obtained. Subsequently, the temporary molded body 12 is immersed in a flame retardant 13 and a surface of the temporary molded body 12 is impregnated with the flame retardant. Thereafter, the temporary molded body 12 is put in a second mold 14, and a second compression molding step is carried out under the conditions that, for example, a temperature is 200°C and a pressure is 100 MPa. At this time, ingredients such as lignin and a hemicellulose are separated from the wood powder, and function as an adhesive. For this reason, pieces of crushed material are firmly bonded with each other so as to be integrated into a single body. Thus, a compression-molded product 15 with a predetermined shape is obtained.

Description

technical field [0001] In recent years, fossil resources represented by petroleum have been consumed in large quantities, and these fossil resources are in danger of being exhausted. In addition, a large amount of carbon dioxide is produced along with the massive consumption of fossil resources, and this is considered to be a cause of global warming. Although petroleum-based resins are still used in many products, in view of the above-mentioned problems, there has been a worldwide trend of using plant-based resins such as polylactic acid instead of petroleum-based resins. Background technique [0002] Polylactic acid is extracted from plants such as corn, and after being discarded, it is decomposed into water and carbon dioxide by microorganisms in the soil. In addition, when polylactic acid is incinerated, water and carbon dioxide are also produced. This carbon dioxide is obtained by plants through photosynthesis and used for plant growth. In this way, plant-based resin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/02
CPCB27N3/02B27N9/00B27N3/08Y10T428/268
Inventor 木村浩一中村贵光
Owner FUJITSU LTD