JPS5831281B2 - Manufacturing method of artificial decorative veneer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a method for manufacturing artificially decorated veneer, and its purpose is to improve the yield of material veneer and to create a unique artificial wood grain pattern using sewing thread. We aim to contribute to the development of this industry by providing a wide range of manufacturing methods that express this.

Conventionally, material veneers such as sliced veneers and rotary veneers obtained from logs tend to crack along the fiber direction at both ends corresponding to the butt ends, and therefore, material veneers with such cracks are is taping, hot melt,
They were repaired by joining them with adhesive.

However, paper tapes and hot melts tend to peel off when wet, and when such repair material veneers are dyed, they have the disadvantage that poor dyeing, that is, undyed portions occur at the joints.

Also, in the case of bonding using an adhesive, there is a drawback that cracks are likely to occur near the bonded portion.

In particular, when veneers are bonded by pasting paper tape, when these are laminated and bonded, poor adhesion between the veneers is likely to occur at the joints using the paper tape.
Even in the process of gluing, pressing and pressing to create deformed flitches, and slicing them to obtain artificial decorative veneers, as mentioned above, the cracks in the veneer layers bonded and repaired with paper tape expanded during the pressing process using the uneven press. Not only will this result in poor adhesion, but also a layer with enlarged cracks will appear in the artificial decorative veneer obtained by such flitch slicing, increasing the rate of defective products.

The object of the present invention is to generally provide a method for manufacturing artificial decorative veneers that can eliminate all of the drawbacks of the conventional manufacturing methods.

The outline of this invention will be explained below based on FIGS. 1 and 2.

That is, as shown in FIG. 2, in a method for producing an artificial decorative veneer in which material veneers are laminated and bonded to form a flitch and the flitch is sliced, the material veneer 1 is
As shown in Fig. 1B, the crack 1a in the fiber direction that occurs at both ends corresponding to the butt ends is almost perpendicular to the crack 1a, or in the same Fig. 1B.
, parallel to the fiber direction along the crack 1a as shown in C,
It is sewn using a sewing system used for sewing general fibers such as nylon, polyester, cotton, linen, and silk.

Alternatively, as shown in the first diagram, a plurality of material veneers 1 may be butted together, or a defective portion of the material veneer may be cut out and another material section may be butted against the cut out portion, and the material veneer may be butted along the abutted portion 1b. The sewing is performed using a sewing thread.

Furthermore, irrespective of the presence or absence of cracks, the butt ends are sewn in advance with a sewing thread approximately perpendicular to or parallel to the fiber direction to prevent cracks.

The type of sewing thread is not particularly limited, but when dyeing is performed, cotton and linen, which have good dyeability, are suitable.

Also, the thread diameter can be applied in the range of 20μ to 1000μ,
Preferably, the thickness is 50μ to 500μ.

Sewing is done using an industrial sewing machine, but the sewing speed is 500
Needles/min - 6000 stitches/min is suitable, and the sewing types include single needle lockstitch, double needle lockstitch, zigzag stitch, pattern zigzag stitch, double chain stitch,
The stitch size is ImW ~ 20mr, such as chain stitch and blind stitch.
n is appropriate.

The conditions for the material veneer suitable for such sewing are specific gravity = 0.
2 to 0.9 m, thickness = 0.2 to 3.0 m, but there are no restrictions on the type of wood and it can be applied to all types of wood.

Since the material veneer is sewn in advance in this way, the cracked parts and butt parts will not peel off during the dyeing process, and if the sewing thread has good dyeability, the sewing thread part will The color becomes dark.

Conversely, if the stainability is poor, the color will be pale.

In particular, if the raw material veneer 1 subjected to such a sewing process is laminated and bonded and then pressed and subjected to a deformation flitch process as shown in FIG. does not cause any inconvenience such as spreading during the pressing process,
The surface layer of the artificial decorative veneer 30 obtained by slicing this flitch 2 also has a surface layer (
(0.15 mm or less) A part of the wood grain pattern of the veneer appears, for example, a radial texture or texture.

Artificial decorative veneer 3 obtained from Flitch 2 also has no color unevenness in the dyeing process, but the color of the sewing threads is slightly different from the surrounding color and has a unique wood grain pattern. Even after coating and bonding, there is no uneven coating or increase in cracks due to sewing threads.

In addition, if the material veneer has cracks or other defects,
As mentioned above, it is possible to obtain a wide material veneer with no defects by cutting out the defective parts and sewing a part of the veneer of another material together, so that raw wood can be used effectively. .

Furthermore, as previously mentioned, threads are sewn perpendicularly or in the direction of the fibers to both ends of the wood veneer, which is prone to cracks, at the end of the wood and is dyed. It can also prevent cracks from occurring during the gluing or flitching process, and a portion of the sewing threads are exposed in the direction perpendicular to the grain pattern of the artificial decorative veneer, resembling a radial structure and very similar to natural wood veneer. It becomes what it is.

As described above, the method for manufacturing artificially decorated veneer of this invention is as follows:
In the method for manufacturing artificial decorative veneers, in which material veneers are laminated and glued to form a flitch, and the flitch is sliced, the material veneer is sewn, so dyeing, pasting, flitch processing, etc. The process does not produce defects such as uneven dyeing, poor adhesion, or gaps, improving the yield of good products and greatly increasing the efficiency of raw wood utilization. It has the effect of revealing a pattern.

Example 1 Made of lamin material, thickness I-Omms, length 1900mm
Sewing speed: 5500 stitches/min Thread type: Cotton 0.15 mm φ Stitch size = 7 mm Needle bar stroke: 30 mm Straight stitch along the end of the rotary material veneer.

Next, this material veneer was cut into 700m lengths, and the paint was coated with Nisuminol Milling Brown 3G (manufactured by Sumitomo Chemical Co., Ltd.) 0.4%.
After dyeing by soaking and boiling in an aqueous solution of 80 to 85℃ mixed with
Dried to 0%.

The crack failure rate of the resulting dyed material veneer was 2.8% (for cracks with a diameter of 150 m or more), which is approximately 10 times lower than the 25% crack failure rate when dyed without conventional treatment. Diminished.

Furthermore, the obtained artificially decorated veneer had a unique wood grain pattern due to the presence of some sewing threads.

Example 2 Sewing speed: 4500 stitches/min for sliced material veneer made of agathis material, thickness 0.811L, rolling length 2500 plates, width 450mm Thread type: nylon 0.08m1φ Stitch size: 4.5mm Needle bar Sew a straight line along the butt end with a stroke of 35 degrees.

Next, this veneer was coated with Lanafast Yellow 2RL (manufactured by Mitsui Toatsu Chemical Co., Ltd.).
......0.2% diethylene glycol......1.0% after dyeing by soaking and boiling in a mixed aqueous solution (92-96°C) for 4 hours, 105 Moisture content 65-80% in drying line at ℃
dried until.

The crack failure rate of the resulting dyed material veneer was 1.4% (those with a crack size of 150 or more), which is one-tenth of the crack failure rate of 19% in the conventional case of dyeing without treatment. It decreased to below.

Example 3 Made of Labra material, thickness 0.71nllL, length 2100
mm, width 700wn rotary material veneer, length 100
Sewing the cracks of mm or more along these cracks at a 4-point zigzag stitch at a speed of 3,500 stitches/min.Sewing Thread type: Cotton: 0.10 mm φ Amplitude: 6 needle bar stroke: 30.8 mm .

Next, this material veneer is coated with Ranil Brown 7R (manufactured by Sumitomo Chemical Co., Ltd.)...
・0.05% Ranil Yellow (manufactured by Sumitomo Chemical Co., Ltd.)・・・・・・・・・0
．． After dyeing by immersing and boiling in a 10% mixed aqueous solution (90-95°C) for 4 hours, it was dried to a water content of 60-70%.

The crack failure rate of the resulting dyed material veneer was 4.5% (for cracks with a size of 150 squares or more), which is approximately 3 times lower than the 14% crack failure rate in the conventional case of dyeing without treatment. It decreased to 1.

In addition, the artificially decorated veneer produced using such a dyed veneer had a radial structure exposed in the wood grain pattern.

Example 4 Made of Melina material, thickness 0.6 mtn, 0.8 mm,
After sewing a rotary veneer with a length of 1,870 mm at a sewing speed of 5,600 stitches/min, sewing thread type: cotton thread, 0.10 mm diameter, stitch size: 4.7 mm, and needle bar stroke = 35 mm, 600 mTL was sewn. Cut to width.

Next, the cut veneer was coated with Suminol Milling Orange SG (manufactured by Sumitomo Chemical Co., Ltd.).
...0.7% Suminol □Ring Yellow RA (manufactured by Sumitomo Chemical Co., Ltd.)...
After dyeing by immersing and boiling in a 0.2% mixed aqueous solution (95-98°C) for 4 hours, it was dried to a moisture content of 70-90%.

The coating amount of these material veneers is 110g/? The flitches were laminated and bonded via a 72" adhesive layer KU224 (manufactured by Konishi Co., Ltd.), and then pressed at room temperature for 4 hours under pressure crab 11 warm conditions to obtain a concavo-convex deformed flitch.

This flitch was sliced to obtain an artificially decorated veneer.

The crack failure rate of the obtained artificial decorative veneer was 0.6% (crack size 150mrLy, above), and the crack failure rate of the conventional artificial decorative veneer obtained from untreated material veneer was 5.9%. It was reduced to almost one-tenth compared to the previous year.

By exposing a part of the sewing thread, the texture of the wood grain pattern was also revealed.

Example 5 Sliced veneers made of lamin material with a thickness of 0.6 m, a length of 2500 mm, and a width of 340 mm were dried to a moisture content of 10 to 20% and cut into widths of 320 mm, and these processed material veneers were cut into two pieces each. Butt sewing speed: 3600 stitches/min Sewing thread type: nylon 0.06mmφ Stitch size: 4.3 Countersunk needle bar stroke: 30.8mm One bell, 4 points staggered along the butt part I sewed it.

These butt-sewn veneers are bonded to adhesive layer Pound C.
HI O7 (manufactured by Konishi) 100% Dye: Suminol °□Ring Brown 5R...
They were laminated and bonded using a 0.1% mixed adhesive layer (coating amount: 170g/771″), and then pressed at room temperature for 18 hours under pressure crab conditions of 13W and 1L to form uneven deformation flitches. Obtained.

Slice this flitch to 2 shaku (60.6 crrL)
Obtained artificial decorative veneer of width.

The obtained artificial decorative veneer does not have defects such as gaps due to butt stitching, and has an excellent appearance similar to that of an artificial decorative veneer obtained based on a wide material veneer. was completed.

Also, due to the presence of a part of the sewing thread, it was possible to have a unique wood grain pattern.

Example 6 Thickness made of Wawa wood 1. Omrr5 0.8 mrn
A rotary veneer was placed in a 0.2% aqueous solution (90-95°C) of Lanafast Brown BL (manufactured by Mitsui Toatsu Chemical Co., Ltd.) for 2 hours.
．． After dyeing by soaking and boiling for 5 hours, the moisture content is 60-80.
% dried.

Sewing speed: 3000 stitches/min Sewing thread type: Polyester 0.08 m 1φ amplitude: 6 mr
rt Needle bar stroke: Two point zigzag stitches were performed with two needles under the conditions of 34.0.

This single plate was laminated with two urethane adhesive layers with a coating amount of 100 g/= through SumiTac BA601 (manufactured by Sumitomo Chemical Co., Ltd.).
After adhering, the flitches were pressed at room temperature for 4 hours at a pressure of 10 to 11 g to obtain a flitch with concavo-convex deformation.

This flitch was sliced to obtain an artificially decorated veneer.

The defective rate of the resulting artificial decorative veneer due to cracks that occur during the slicing process was 1.2%, compared to the 7.4% failure rate of artificial decorative veneers produced by the conventional processing process in which cracks are not sutured. It decreased to less than one-sixth.

In addition, the wood grain pattern was unique and had scattered patterns.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the sewing process of an embodiment of the present invention, and FIG. 2 is a process explanatory diagram showing the flitching process and slicing process of the embodiment. 1...Material veneer, 1a...Cracked, 1b
...Butt part, 2...Flitch, 3
...Artificial decorative veneer.

Claims (1)

[Claims] 1. After sewing a material veneer with a sewing thread, a large number of the material veneers are laminated with an adhesive interposed, and then pressed to create a flitch, and the flitch is cut. A method for manufacturing artificial decorative veneer, characterized in that a part of the sewing thread is exposed within the wood grain pattern.