JP2984828B2 - Wood compaction method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a method and an apparatus for consolidating wood, specifically, for example, as a conduit for electric wiring.
The present invention relates to a method and an apparatus for consolidating wood for producing compacted cylindrical wood to be used .

[0002]

2. Description of the Related Art At present, the technique of consolidating wood has reached the stage of practical use, and various methods of consolidation have been tried. The purpose of consolidation of wood is to increase the mechanical strength and hardness of the wood by increasing the density of the wood structure, and to improve the quality of the wood and to make molding easier than conventional cutting. It is intended to enhance the value of wood use by improving productivity and the like, and is particularly expected for the effective use of soft wood or thinned wood.

[0003] For example, cylindrical compacted wood used as a conduit or the like for electric wiring is formed by winding a thin single plate obtained by rotary cutting or slice cutting into a cylindrical shape so as to have a space in the center. After filling in a cylindrical (pipe-shaped) metal casing tube with water, it is softened with steam, and then a cylindrical or round bar-shaped press-in die is inserted into the center space of a thin sheet veneer wound in a cylindrical shape. After press-fitting to compress the thickness direction of the thin sheet veneer rolled in a cylindrical shape, or after expanding the inner core mold inserted in advance in the radial direction and compressing it, heat-fix its state by high-temperature heating. Manufactured.

[0004]

However, in the case of conventional compacted wood, only a single thin plate is rolled into a cylindrical shape and the compacted wood is compressed in the thickness direction. In addition, the bonding strength between the laminated single sheets laminated in a cylindrical shape after consolidation is low, and there is a possibility that the laminated single sheets laminated in a cylindrical shape after consolidation may be separated, and furthermore, it is also vulnerable to corrosion due to water leakage and the like. There are also problems.

[0005] In addition, the conventional cylindrical compacted wood is:
Wood to be consolidated (thin veneer rolled into a cylinder)
Because of the small thickness of the plate, even if it is consolidated to compress its thickness direction, there is naturally a limit to the increase in strength due to consolidation, and in places where strength is required, the woody feel is preferred. There is a problem that it cannot be used.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and completely prevents peeling between laminated single sheets laminated in a cylindrical shape after consolidation, and reduces mechanical strength as a cylindrical consolidated wood. It is an object of the present invention to provide a method and an apparatus for consolidating wood, which is capable of producing cylindrical compacted wood that is improved and is resistant to corrosion due to water leakage and the like.

[0007]

In order to achieve the above-mentioned object, the present invention provides a thin (single-plate) metal casing tube formed by winding a thin plate into a cylindrical shape with a space in the center. In the loaded state, after softening treatment with water vapor, a cylindrical or round bar-shaped pressing die is placed in the center space of the cylindrical single-layered sheet veneer, and the thickness direction of the cylindrical single-sided veneer. When press-fitting or compressing a pre-inserted inner core mold in the radial direction, and then heat-setting by high-temperature heating, when winding a thin veneer into a cylindrical shape Further, sheet-like synthetic fibers that are melted at or below the temperature at which wood is thermally fixed are simultaneously wound up, and the above-mentioned sheet-like synthetic fibers are interposed between thin single plates laminated in a cylindrical shape.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

1 to 3, (1) is a thin single plate obtained by rotary cutting or slice cutting, (2)
Is a synthetic fiber that melts at or below the temperature at which wood is heat set (eg, polyamide, polyester, etc.)
(3) is a cylindrical (pipe-shaped) metal casing tube, (4) is a press-fitting device, and a cylindrical or round bar-shaped press-in die (5) Paste taken at the distal end of the piston rod (6a) of the hydraulic cylinder (6), mounted integrally through the bracket (8) on the fixed member (7) by extending movement of the piston rod of the hydraulic cylinder (6) (6a) The metal mold (5) is pressed into the metal casing (3).

Next, the method for consolidating wood in the present invention will be described.

First, the thin single plate (1) is wound into a cylindrical shape so as to have a space at the center. When the sheet veneer (1) is wound into a cylindrical shape, the sheet-like synthetic fibers (2) are simultaneously wound and the sheet-like synthetic fibers (2) are sandwiched between the sheet veneers (1) to be laminated in a cylindrical shape. Intervene.

Next, the thin sheet veneer (1) wound in a cylindrical shape is loaded into a metal casing tube (3), which is softened with steam. That is, a metal veneer tube (3) is loaded with a thin cylindrical plate (1) wound in a cylindrical shape and is housed in a processing tank (not shown) to supply steam into the processing tank. The temperature of the inside of the processing tank is raised by the steam. By placing the cylindrical veneer veneer (1) in the processing tank heated by steam in this way for a predetermined time, the cylindrical veneer veneer (1) is heated by steam. And soften uniformly.

Next, the thin sheet veneer (1) which has been softened with steam and wound into a cylindrical shape is compressed. That is, the metal casing tube (3) is integrally attached to the fixing member (7) via the bracket (8) in a state in which the thin sheet veneer (1) which has been softened and wound into a cylindrical shape is loaded therein. Then, the hydraulic cylinder (6) of the press-fitting device (4) is operated to operate the piston rod (6a).
Is extended, and the pushing die (5) is advanced by the extension operation of the piston rod (6a) to move the thin cylindrical single plate (1) loaded in the metal casing tube (3). Press into the center space. The press-in die (5) is pressed into the center space of the softened cylindrical single plate (1) to be loaded into the metal casing tube (3), thereby forming the cylindrical shape. In order to compress the veneered veneer veneer (1) in the thickness direction, the veneered veneer veneer (1) is consolidated.

Next, the compacted single-sheet thin plate (1) wound in a cylindrical shape is heat-fixed. That is, in a state in which the metal mold (5) is pressed into the center of the cylindrical single plate (1) loaded in the metal casing tube (3) and is pressed into the center, it is harder than in the softening process. When heat treatment is performed again with high-temperature steam for a predetermined period of time, the compacted single-layer thin plate (1) is thermally fixed by the steam.

Then, after cooling the heat-fixed cylindrical veneer veneer (1), removing the cylindrical veneer veneer (1) from the metal casing tube (3). By this, cylindrical compacted wood can be manufactured.

The cylindrical compacted wood produced according to the present invention is a sheet-like synthetic material which is melted at a temperature at which the wood is heat-fixed or lower when the thin veneer (1) is wound into a cylindrical shape. Since the sheet-like synthetic fiber (2) is interposed between the thin veneers (1) which are simultaneously wound up and laminated in a cylindrical shape, the interposed sheet-like synthetic fiber (2) Is melted and hardened to act as a hot-melt adhesive, so that the bonding strength between the consolidated cylindrical laminated sheets (1) is dramatically improved, and the consolidated cylindrical laminated sheets are laminated. Peeling between the veneers (1) can be completely prevented. Moreover, since the strength is increased by the melt-hardening of the sheet-like synthetic fiber (2) in addition to the increase in strength due to the compaction of the thin veneer (1), the mechanical strength as a cylindrical compacted wood is also remarkable. To improve. Furthermore, since a hydrophobic coating is formed by the sheet-like synthetic fiber (2) between the laminated thin veneers (1), cylindrical compacted wood which is resistant to corrosion due to water leakage and the like. Can be.

In the above embodiment, the pressing die (5) is press-fitted into the space at the center of the cylindrical veneer (1) to consolidate the veneer (1). However, the present invention is not limited to this, and the inner core die inserted in advance into the center space of the cylindrically wound thin single plate (1) is radially extended to project the thin single plate. The plate (1) may be compacted.

In the above-mentioned embodiment, the method of cooling after heat setting, the method of loading the thin cylindrical plate (1) into the metal casing tube (3), and the method of removing the same are not particularly limited. In addition, the thickness, the number of windings, the compression ratio, and the like of the thin single plate (1) are arbitrary and are not limited.

[0019]

As described above, according to the present invention,
A cylinder that completely prevents peeling between laminated single veneers after consolidation, improves the mechanical strength of cylindrical consolidation wood, and is durable against corrosion due to water leakage, etc. It has the advantage that it can be made into compacted wood, and although it has a woody feel, it can be used in places where it could not be used conventionally due to problems such as corrosion due to strength and water leakage, especially soft materials, Alternatively, thinned wood can be effectively used in a wide range.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a method and apparatus for consolidating wood according to the present invention.

FIG. 2 is an enlarged view of a portion A in FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thin veneer 2 Sheet-like synthetic fiber 3 Metal casing 4 Press-fitting device 5 Pushing die 6 Hydraulic cylinder 7 Fixing member

Claims (2)

(57) [Claims] 1. A thin sheet veneer is wound in a cylindrical shape so as to have a space in the center, loaded in a cylindrical (pipe-shaped) metal casing tube, softened with steam, and then formed into a cylindrical shape. A cylindrical or round bar-shaped press die is pressed into the center space of the rolled thin veneer so as to compress the thickness direction of the rolled thin veneer, or an inner core inserted in advance. In the method of consolidating wood, in which the mold is stretched in the radial direction and compressed, and then heat-set by high-temperature heating, when the thin veneer is rolled into a cylindrical shape, the temperature is set at the temperature at which the wood is heat-set or lower. A method for consolidating wood, wherein the synthetic fibers to be melted are simultaneously wound, and the synthetic fibers are interposed between thin single plates laminated in a cylindrical shape. 2. A cylindrical metal casing tube for loading a thin sheet veneer wound with a sheet of synthetic fiber that melts at or below the temperature at which the wood is heat-set, and a cylindrical coil. After the thin veneer is placed in a metal casing tube and softened with water vapor, a cylindrical or round bar-shaped pressing die is inserted into the center space of the thin veneer rolled into a cylindrical shape. Means for press-fitting in a thickness direction of a thin sheet veneer wound in a cylindrical shape, or protruding in a radial direction a pre-inserted inner core mold and compressing it. .