JP3227344U - Veneer center connection tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape which can be provided in a short time without using a monofilament in connecting a veneer core. SOLUTION: A wide veneer core connecting tape 1 is placed on the upper surface of a connecting portion and is strongly bonded by applying heat and pressure. The tape 1 is a sheet composed of a non-woven fabric 2 having a basis weight of 25 g/m2 to 50 g/m2 and a hot melt adhesive layer 3 and punched with a number of holes 4 and cut into a width 31 to 52 mm to obtain a roll 5. It has a rolled structure. Radiation rays from a far infrared heater or the like are applied to the hot melt layer 3 side of the tape 1 to melt the hot melt adhesive, and the single roll is strongly pressure-bonded to the single plate with a rubber roll. By punching a large number of holes using a non-woven fabric, the adhesive liquid has the effect of soaking into the non-woven fabric, entering the holes, and curing to firmly bond the single plates together. [Selection diagram] Figure 1

Description

The veneer core used for veneer is made by connecting veneers lacking 3 or 6 shaku. The present invention relates to these short single-plate connecting tapes.

Conventionally, hot melt adhesives have been used for connecting single plates. That is, the hot-melt adhesive melted at 140 to 150°C is divided into two parts, one is used for sticking the veneer of the single plate (Fig. 3), and the other is applied to the monofilament 3 bundle 8 (Fig. 4). It is used to supplement the strength of pasting by inserting the veneer group from above and below by sticking it on the top and bottom of the board group. For the sticking of the mouthpiece, the hot-melt adhesive 7 melted in a dot shape is applied to the mouthpiece 6 of the veneer 1013, the veneer 1014 sent later is pressed and the adhesive spreads, and the veneer 1013 and the veneer 1014 are cooled. Are connected. The thickness of the veneer is as thin as 3 mm, and the connecting work is performed while the veneer group is moving on the belt. Therefore, the adhesive is likely to come off before the adhesive is solidified, and perfect adhesion cannot be expected.

A 1000 denier tetron monofilament (a bundle of 192 monofilaments) 8 is used as the monofilament (FIG. 4) in a pipe 9 containing molten hot melt adhesive. The bundle 8 of monofilaments is impregnated with hot melt adhesive as it passes through 9 and is attached to the veneer with shoes 10. The single plate groups 1011, 1012, 1013, and 1014 are sandwiched by a bundle of monon filaments having two upper surfaces and one lower surface to supplement the connection of the single plate groups.

Both the conventional wood veneer core single plate connection and the monofilament reinforcement for reinforcement have a small adhesive area, and the connection may be easily peeled off. Especially in the case of severely warped veneer, the monofilament bundle may not be adhered from the beginning. It aims to solve the problem by using tape to complete the adhesion.

(FIG. 5A) The tape of the present invention having a large adhesive area is placed on the upper surface of the connecting portion between the single-core single plates 1013 and 1014, and heat and pressure are applied to strongly bond the solution. The tape has a width of 31 to 52 mm and a length of 3 or 6 tapes, and the adhesion area is sufficiently large. Before sticking, radiate rays of an electric heater, infrared heater, far infrared heater, etc. on the hot melt side of the tape to melt it (softening point of hot melt is 100-115°C), and strongly press the rubber roll 12 from the nonwoven side of the tape. To do. If there is a risk of hot melt sticking to the roll, use a silicone rubber roll. Generally, a tape width of 31 mm (Fig. 6-1) is sufficient, but there is a 52 mm width tape (Fig. 6-2) for thick single plates and special single plates. The reason for using a non-woven fabric and punching holes is that when a veneer is laminated with an adhesive such as urea resin, melamine resin, or phenol resin during plywood production, the adhesive solution often penetrates into the non-woven fabric and This is so that the intruding upper and lower veneers can be strongly bonded.

The tape of the present invention can be strongly adhered to the upper surface of the core single plate connecting portion by heat sealing in a short time. In the case of ordinary veneer, the tape of the present invention is sufficient for the 31 mm width of (Fig. 6-1), but for thicker veneer or special use, 52 mm of tape (Fig. 6-2) is available. .. An example of a far-infrared heating furnace is one that can raise the temperature to 130°C by irradiation for 40 seconds, which can considerably speed up the conventional core connection work.

The tape of the present invention eliminates the need for monofilament reinforcement. In the conventional method in which the hot-melt adhesive is melted in the hot-melt melting tank, oxidative-degrading kogeus is accumulated, so cleaning which takes time and labor is sometimes necessary, but the melting tank is not necessary in the present invention.

An overhead view of the tape for connecting a veneer core of the present invention Sectional view of the tape of the present invention AB section Explanatory drawing with conventional core core sticking Illustration of reinforcing conventional monofilament Illustration of how to use the tape of this invention (heating process) Illustration of how to use the tape of the present invention (crimping process) Explanatory drawing of the tape (31mm width) hole of the present invention Illustration of the tape (52mm width) hole of the present invention

Nonwoven fabric using a roll having a basis weight of ^{25g / m 2 ~50g / m 2} , 1m width × 4000 m of Tetron.

The hot melt adhesive used is Polyolefin wax 30
Ethylene, vinyl acetate copolymer (M1:1) 3-6
Ethylene, vinyl acetate copolymer (M1:15) 33-30
Rosin ester resin 10-14
C5 petroleum resin 24-20
Antioxidant 0.15
100.15 in total
The hot-melt adhesive obtained by melt-mixing the above until uniform has a viscosity at 150° C. of 20.000 to 25.000 mPa.s. s (B-type viscometer) and softening point 110 to 115° C. (ring and ball method).

The tape of the present invention is manufactured by punching a number of holes as shown in (Fig. 6-1) and (Fig. 6-2) in a sheet consisting of two layers of the non-woven fabric 2 and the hot-melt adhesive layer 3 and having a width of 31 mm or A tape of the present invention was obtained by cutting a scroll 5 having a width of 52 mm (Fig. 1). The (nonwoven fabric-hot melt) sheet is obtained by thinly spreading one face of the nonwoven fabric by melting hot melt to a thickness of 0.2 mm to 0.4 mm using a kiss roll or a doctor blade. The coating temperature should be as low as possible to prevent the non-woven fabric from seeping in as much as possible.

As another method of making, there is a method in which a thin film of hot melt is first made with an extruder and a T-die, and the hot melt film is partially melted in spots and a non-woven fabric is placed and partially spot-bonded.

How to use the tape of the present invention will be described with reference to FIGS. 5-1 and 5-2. Unwind the tape roll 5 of the present invention having a width of 31 mm and cut it into 3 shaku (or 6 shaku) lengths, warm the hot melt layer 3 to 130° C. by far-infrared radiation 11, and put the tape on the connecting part of the core single plate. , The roll 12 strongly presses the single plate. Since the adhesion is strong, it can sufficiently withstand the vibration accompanying the movement of the single plate group. When the adhesive liquid such as urea resin, melamine resin, and phenol resin is applied in the next step of plywood production, the nonwoven fabric 2 is sufficiently impregnated with the resin liquid, and the hole 4 is also filled with the resin liquid so that the upper and lower veneers are completely bonded. To be done.

1. Veneer core connection tape 2. Non-woven fabric 3. Hot melt layer 4. Hole 5. Tape roll 6. Core veneer veneer 7. Hot melt adhesive 8.1000 denier hetetron monon filament 9. Pipe 10. Sticking shoe 11. Press roll 1011 Core single plate group connected 1012 Core single plate group connected 1013 Core single plate group connected 1014 Core single plate group connected

Claims (1)

Those punched basis weight ^25g / ^{m 2 ~50g} / m 2 nonwoven fabric 2 and the large number of sheets consisting of two layers months holes 4 of the hot melt adhesive layer 3 was cut into a width 31Mm～52mm, as scrolls 5 Connection tape for veneer core with a rolled structure.

Images