JPH07100322B2 - Plywood using wood and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a sawn timber obtained from thinned timber cut in afforestation, or a laminated timber produced by joining timber scraps on the epidermis side after collecting prismatic materials from logs. Further, the present invention relates to a plywood manufactured by using various plate materials such as a plate material obtained by peeling a log material to a predetermined thickness, and a manufacturing method thereof.

[0002]

[Prior Art] A sawn timber obtained from thinned timber, etc., which has been conventionally felled by afforestation, or a sawn timber on the epidermis side after collecting prismatic timber from logs is used to effectively utilize the entire volume without waste. Plywood made by laminating a plurality of these plate materials, or made by laminating multiple logs (veneer plate) formed by peeling a log material to a predetermined thickness as a general laminated wood The plywood is used as various building materials or as decorative boards. In order to prevent "warpage", such a plywood normally uses an odd number of plate materials and is manufactured by surface-bonding the plate materials using an adhesive. For example, in the case of a plywood board composed of three plates, the plate located at the center acts as a core, and two plates are attached to the front and back of this core in a well-balanced manner. It has the feature that "warp" does not occur in the plywood due to environmental changes in temperature and humidity. In addition, the above plate material is 5
Even when an odd number of sheets such as 7 sheets or 7 sheets is used, the same "warp" preventing action due to the presence of the core material can be obtained.

[0003]

However, such a conventional plywood using wood is always manufactured by using an odd number of plate materials as described above, and therefore requires a minimum of three plate materials. Therefore, there is a problem that the cost and manufacturing man-hours are not always satisfied.

Generally, a sawdust obtained from ordinary logs has a habit of causing "warpage" in a direction opposite to the curving direction of annual rings formed on wood. This is because the strength of the log is maintained by the ring line of the annual ring, whereas the ring line of the sawwood is cut, so the ring effect of the annual ring is lost, and the shrinkage of the wood during drying is caused. The above-mentioned "warpage" occurs when stress is applied. Therefore, if such a problem of "warpage" is solved, it is considered possible to manufacture, for example, a plywood in which two plate materials are surface-bonded, and moreover, compared with the case of using three plate materials. It is considered to be extremely advantageous in terms of material costs and bonding man-hours.

Therefore, the present invention solves the problems of the conventional plywood using wood, and the number of plate materials is not limited to an odd number, and an even number can be employed. It is an object of the present invention to provide a plywood using wood that does not cause "warpage" and a method for manufacturing the plywood.

[0006]

In order to achieve the above object, the present invention forms an infinite number of substantially linear or reticulated cracks on a plate surface in a direction opposite to the curved direction of the annual ring of the plate material. The basic structure is a plywood that is made by surface-adhering multiple sheets of the above. Furthermore, the plate material is formed by peeling the log material to a specified thickness.
It is made Te plate configuration, configuration sheet is laminated wood to the skin-side edge member fabricated by joining after collecting prismatic material from挽割material or round timber obtained from thinnings which are cut down, plate
It is provided that the number of bonded sheets is an even number of two or more .

The present invention further provides a plate material obtained by placing a plate material in a raw wood state on a machine stand with the growth direction of the annual rings of the plate material facing upward, or by peeling a log material to a predetermined thickness. It is placed on the machine stand and is conveyed on the machine stand while holding the plate material by a plurality of roller devices that rotate by receiving the driving force of the drive source, and the plate material is forcibly curved by the roller device. Then, there is provided a method for manufacturing plywood in which a myriad of substantially linear or net-like "cracks" are formed on the surface of one side of a plate material, and a plurality of the plate materials are surface-bonded and integrated.

[0008]

According to the plywood using such wood and the method for manufacturing the same, a plate material in a raw wood state is forcibly curved when being sandwiched and conveyed by the roller device, that is, a direction opposite to the curved direction of the annual ring of the wood, that is, Countless small "cracks" are formed on the plate surface in the direction of "warpage". By forming such "cracks", it is possible to prevent the "warp" of the plate material from being caused by the decrease in strength due to the cutting of the annular ring of the plate material and the contraction stress during drying. Two or more sheets of this plate material are used and surface-bonded with an adhesive to integrate them to obtain a wooden plywood without the above-mentioned "warp".

As the above-mentioned plate material, a plate material made of laminated wood produced by joining timber scraps on the skin side after collecting prismatic materials from log materials or logs obtained from thinned wood cut by planting is used. It is possible. Further, by forming the "crack" on one surface of a plate material formed by peeling a log material to a predetermined thickness, the "warp" of the plate material is similarly prevented.

[0010]

EXAMPLES Specific examples of plywood using wood according to the present invention and a method for producing the same will be described below. In the present embodiment, a plate material or a log material made of laminated wood produced by joining sawdust materials obtained from thinned wood cut by tree planting or joining timber scraps on the skin side after collecting prismatic materials from logs. The plywood is manufactured by using an even number of two or more plate materials obtained by peeling off the sheet to a predetermined thickness.

Further, the present embodiment is characterized in that a process for eliminating the deformation stress of the plate is performed in order to prevent the "warp" of the plate material. FIG. 1 is a side view of a first embodiment showing an outline of a roller device used when manufacturing a plywood according to this embodiment, and FIG. 2 is a plan view of the same. In the figure, 1 is a front upper roller, 2 is a front lower roller, 3 is a central roller, 4 is a rear upper roller, 5 is a rear lower roller, and between these rollers 1, 2, 3, 4, and 5. A machine stand 6 is provided,
A plate member 7 is placed on this machine base 6.

The above rollers 1, 2, 3, 4, 5 are rotationally driven in the directions shown by the arrows in FIG. 1 by receiving the driving force of a driving source composed of a motor, a speed reducer and the like (not shown). It That is, the front upper roller 1 and the rear upper roller 4 are driven to rotate left, and the front lower roller 2, the center roller 3 and the rear lower roller 5 are driven to rotate right. In the illustrated example, the central roller 3 is formed to have a shorter diameter than other rollers, and has a function as a plate angle adjusting device for the plate material 7 to be conveyed.

As the plate material 7, a sawed wood material obtained from a normal thinned wood, a laminated wood material, or a wood board obtained by peeling a log material to a predetermined thickness can be used. A material will be described as an example. That is, FIG. 3 shows an example of the sawdust 11 as a plate material, and the sawdust 11 is placed on the machine stand 6 with the growth direction A of the annual rings facing upward. Further, it is preferable to use hard rubber as the material of each roller, but it is also possible to use other synthetic resin materials.

Then, the drive source of the rollers is activated to rotate the rollers 1, 2, 3, 4, 5 in the directions shown by the arrows in FIG. Push in between. Then, the leading end of the plate material 7 is conveyed from the intermediate portion of the rollers 1 and 2 to the upper portion of the central roller 3 and the rollers 4, 5
It is sandwiched between them, but at this time, the plate material 7 is rolled by the rollers 1, 3, 4
It is forcibly curved by the state of FIG. 1, that is, the plate member 7 has a bent shape in which the central portion thereof projects upward. Due to the bending action at this time, innumerable small “cracks” 13 are formed on the upper surface of the plate member 7 as shown in FIG. The plate material 7 is further conveyed between the rollers 4 and 5 and returns to the machine base 6.

The above-mentioned "cracks" 13 are formed by splitting the fibers in a substantially linear or net-like manner on the plate surface in the direction opposite to the curving direction of the annual ring of wood, that is, the direction in which "warping" occurs. Such a "crack" 13 is a plate material 7 in a raw wood state.
When the plate material 7 is formed, the strength of the plate material 7 is reduced due to the cutting of the annular line of the annual ring, and the contraction stress at the time of drying causes the plate material 7.
It is possible to prevent the above-mentioned "warpage" from occurring.

The plywood according to this embodiment is manufactured by surface-bonding two plate members 7 thus obtained with an adhesive to integrate them. It is also possible to use two or more sheets of plywood having a large plate thickness. The bonding surface of the plate material 7 is not particularly limited, but it is preferable to bond the plate material 7 with the surface on which the “crack” 13 is not formed being the outer side from the viewpoint of appearance.

FIG. 4 is a side view of the second embodiment of the present invention, and FIG.
Is a plan view of the same. In the case of the present embodiment, auxiliary rollers 15, 1 are provided outside the front upper roller 1, the front lower roller 2, the rear upper roller 3 and the rear lower roller 5.
6, 17, 18 are provided. By providing such auxiliary rollers 15, 16, 17, 18,
The plate member 7 placed on the machine base 6 can be moved smoothly. The action on the plate member 7 is the same as in the first embodiment.

The plate material used in the present invention, which is formed by peeling off the log material to a predetermined thickness, is a plate material for producing general veneer plywood, and a known cutting blade attached to a rotary roller cuts wood to a predetermined thickness. It is formed by peeling. This plate material is also subjected to the same treatment as the sawdust material 11, and one side,
An infinite number of substantially linear or net-like cracks are formed, and a plurality of these plate materials are surface-bonded and integrated to manufacture a plywood.

Next, a method of manufacturing a plywood using a laminated wood, which is manufactured by joining the wood-side scraps on the skin side after collecting the prismatic materials from the logs, will be described. That is, the log material 21 shown in FIGS.
Based on the end opening 22 of the, the core portion 23 of the annual ring of the log 21
Centered on sawdust 24, 25, 26, 2 with a specified thickness
7, 28 are first created. The sawdust materials 25, 27 and the sawdust materials 26, 28 are symmetrical, and both have a substantially trapezoidal sectional shape.

The above sawdust 25, 26, 27, 28 is
After forming a myriad of small "cracks" on one surface of the sawdust material that is opposite to the bending direction of the annual ring using the roller device shown in FIG. 1 or 4, as shown in FIG. 8 and FIG. The step portions 30 and 30 having the long sides protruding with reference to the edges of the short sides of the two parallel sides in the cross-sectional shape of the sawdust 25 and 26 are cut and formed using an earing machine or the like. By cutting off the bent portions 31, 31, bilaterally symmetrical step portions 30, 30 are formed at both end portions of each of the sawdust materials 25, 26.

With the substantially trapezoidal plane and cross-sectional shape obtained in this way, the sawing material is shown in FIG. 10, and each step portion 30 is formed so that the end openings 22 and the main openings 35 are alternately adjacent to each other. Thirty
The laminated wood material board 40 having a constant width
Is obtained. The obtained laminated wood material plate 40 is assembled so that the curved directions of the annual rings of the respective sawn wood materials are opposite to each other.

By further joining the above-mentioned laminated wood base plate 40 laterally through the step portions 30, 30, a laminated material having a predetermined width can be obtained. 11 to 16 show an example of a surface bonding method for the obtained laminated members 45, 45. 11 is an example in which two laminated members 45, 45 are attached in the same direction, FIG. 12 is a view from the direction B in FIG. 11, and FIG. 13 is a view from the direction C.

FIG. 14 shows an example in which one of the two laminated members 45, 45 is deviated by 90 degrees and bonded, and FIG. 15 is shown in FIG.
FIG. 16 is a view from the direction D, and FIG. 16 is a view from the direction E. Further, FIG. 17 is an example in which one of the two laminated members 45, 45 is offset by 45 degrees and bonded, and FIG.
Is a view from the F direction, and FIG. 19 is a view from the G direction.

As described above, the laminated members 45, 45 are offset in not only the same direction but also an arbitrary direction and bonded to each other, whereby a plywood having desired performance and appearance can be obtained.

[0025]

As described above in detail, according to the plywood and the method for manufacturing the same according to the present invention, the raw wood plate is forcibly curved by the roller device, so that the annual ring of the wood is formed. Innumerable small "cracks" are formed on the plate surface in the direction opposite to the curving direction of, i.e., in the direction of "warp", or on one surface of the plate material formed by peeling the log material to a predetermined thickness. Therefore, it is possible to prevent "warp" from occurring in the plate material due to the strength reduction due to the cutting of the annular line of the annual ring of the plate material and the contraction stress during drying. Therefore, unlike the conventional wood plywood, it is not always necessary to manufacture using an odd number of plate materials of three or more, and since it is possible to manufacture using at least two plate materials, it is possible to reduce the manufacturing man-hours and the cost. Can be measured.

[0026] As the plate material, a sawed wood material obtained from thinned wood cut in tree planting, or a laminated wood material produced by joining wood-side scraps on the skin side after collecting prismatic materials from log materials, or logs. Various plate materials such as a plate material formed by peeling the material into a predetermined thickness can be used, and there is an effect of high versatility.

When using laminated lumber, there are a method of surface-bonding the two annual rings of the laminated wood in the same direction and a method of surface-bonding the annual rings of the two laminated wood by deviating in any direction. It is feasible and plywood with desired performance and appearance can be obtained.

[Brief description of drawings]

FIG. 1 is a side view showing an outline of a roller device used when manufacturing a plywood according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view showing an example of a plate material used in this embodiment.

FIG. 4 is a side view showing an outline of a roller device according to a second embodiment of the invention.

5 is a plan view of FIG.

FIG. 6 is a sawing instruction diagram when creating sawed material.

FIG. 7 is a perspective view showing the appearance of a log material.

FIG. 8 is a front end view of the sawdust.

FIG. 9 is an end face view of the sawed material.

FIG. 10 is a plan view of the laminated wood material plate.

FIG. 11 is a perspective view showing an example in which two laminated members are attached in the same direction.

FIG. 12 is a view from the direction B in FIG.

FIG. 13 is a view from the direction of C in FIG.

FIG. 14 is a perspective view showing an example in which one of the two laminated members is deviated by 90 degrees and bonded together.

FIG. 15 is an arrow view from the direction D in FIG.

16 is a view from the direction D in FIG.

FIG. 17 is a perspective view showing an example in which one of the two laminated members is deviated by 45 degrees and then bonded.

FIG. 18 is an arrow view from the F direction in FIG.

FIG. 19 is a view from the direction of G in FIG.

[Explanation of symbols]

 1 ... Front upper roller 2 ... Front lower roller 3 ... Central roller 4 ... Rear upper roller 5 ... Rear lower roller 6 ... Machine base 7 ... Plate material 11, 24, 25, 26, 27, 28 ... Grinding material 13 ... Crack 15 , 16, 17, 18 ... Auxiliary roller 21 ... Log material 22 ... End opening 23 ... Core part 30 ... Step part 31 ... Curved part 35 ... Source opening 40 ... Laminated wood fabric plate 45 ... Laminated wood

Claims (10)

[Claims] 1. A number of substantially linear or net-like cracks are formed on a plate surface in a direction opposite to a curved direction of an annual ring of the plate material,
Plywood using wood, characterized in that a plurality of these plate materials are surface-bonded and integrated. 2. A sheet material was used timber according to claim 1, wherein a plate material obtained by forming strip the round timber to a predetermined thickness plywood. 3. A process according to claim 1, wherein the plate material is a laminated timber which is manufactured by bonding the skin-side edge material after collecting the prismatic material from挽割material or round timber obtained from thinnings which are felled Plywood made from wood. 4. A plywood with claim 1, wherein the timber is a even number bonding number is more than two plates material. 5. A plywood using wood according to claim 3, wherein the two annual rings of the laminated wood are arranged in the same direction and are surface-bonded. 6. A plywood using wood according to claim 3, wherein two laminated annual rings of laminated lumber are displaced in an arbitrary direction and surface-bonded. 7. A plate material in a state of raw wood is placed on a machine stand with the growth direction of the annual rings of the plate material facing upward, and the plate material is rotated by a plurality of roller devices which receive a driving force of a driving source and rotate. While being held, the plate material is conveyed on the machine base, and the plate material is forcibly curved by the roller device to form an infinite number of substantially linear or mesh-like "cracks" on one surface of the plate material. 2. A method for manufacturing a plywood using wood, characterized in that a plurality of the sheets are surface-bonded and integrated. 8. The method of manufacturing a plywood using wood according to claim 7, wherein the “crack” is a direction opposite to the direction of curve of the annual ring of the wood, and is a plate surface in a direction in which the “warp” occurs in the plate material. 9. A plate material formed by peeling a log material into a predetermined thickness is placed on a surface machine stand, and while sandwiching the plate material by a plurality of roller devices which are rotated by receiving a driving force of a driving source. The plate material is conveyed on a machine base and is forcibly curved by the roller device to form an infinite number of substantially linear or net-like "cracks" on one surface of the plate material. A method for manufacturing a plywood using wood, which is characterized in that the pieces are surface-bonded and integrated. 10. The method for manufacturing a plywood using wood according to claim 7, 8 or 9, wherein the material of the roller is hard rubber.