JPS62109877A - Bonding with hot-melt adhesive or such - Google Patents

Abstract

PURPOSE:To enable the bonding of adherends such as wood, etc., with simple operation and apparatus in a short time, by placing an electrically heat- generating metal in combination with an adhesive between adherends and heating the adhesive with electric current. CONSTITUTION:An electrically heat-generating metal 2 (e.g. stainless steel plate having perforations 7) is placed on a substrate material 1. an adhesive 6 (e.g. powder of ethylene-vinyl acetate copolymer) is placed on the top of the electrically heat-generating metal 2 and a plywood 3 is placed on the adhesive. The adhesive 6 is heated by electrifying the electrically heat-generating metal 2 to effect the bonding of the substrate material 1 and the plywood 3. The electrically heat-generating metal 2 may be integrated with a hot-melt adhesive before use.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a novel method for bonding wood and the like using a hot melt adhesive or the like.

<Prior art> Hon 1 ~ Mel 1 ~ Adhesives bond as soon as they cool, so the setting time is as short as about 1 second, so they have the advantage of good work efficiency, and are used in a variety of fields. .

Conventionally, Hola 1 to Melt Adhesive 1A: To use it, an applicator consisting of a melting part and an application part is required. There are various types such as type, foil type, roll type, etc., and there is a limit to how easy and low cost can be kept below a certain level.

In addition, once such equipment is stopped, it generally takes a certain amount of time to restart if the nozzle becomes clogged;
In many cases, a useless continuous heating state is maintained.

Problems to be Solved by the Invention In the conventional bonding method using a double-sided adhesive, the heating means must be performed in a previous step that has no relation to the members to be bonded. There wasn't. The present invention attempts to enable heat bonding between members to be bonded, thereby solving the complicated and high cost of the conventional method.

Means for Solving the Problems Therefore, the present invention provides the following features: 1. When bonding target members such as wood and plywood using a melt adhesive or the like, an energized heat-generating metal is placed between the target members together with the adhesive. Then, the adhesive is heated by energization, and the adhesive is solidified by stopping the energization for one time, thereby bonding the members to be bonded.

Here, the adhesive for hot melt 1 is ethylene vinyl acetate copolymer (EVA), polyamide, polyester, atactic polypropylene, etc., and can be bonded by heating.

In addition, since the present invention attempts to complete the bonding by heat generation by making the adhesive between the parts to be bonded coexist with an energized heat generating metal, it is possible to use other adhesives such as epoxy resin adhesives in addition to hot melt adhesives. To.

It also includes a bonding method using an adhesive that is liquid at room temperature and whose curing time can be shortened by heating.

Generally speaking, nichrome is considered to be the current-generating metal, but 1
In the present invention, other metals such as inexpensive aluminum foil, stainless steel alloy, and fine carbon particles which have a small resistance value by themselves can be used as the current-generating metal.

According to the method of the present invention, when a suitably adjusted current is passed through the energized heat-generating metal coexisting with the hot melt adhesive, the energized heat-generating metal reaches a predetermined temperature, and the members to be bonded are bonded together. Make it possible. When the electricity is turned off, the adhesive solidifies and the bonding is completed.

Example Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing a case where the objects to be bonded are wood, a hexagonal stainless steel plate (30μ thick) is used as the energized heat generating metal, and EVA is used as the hot melt adhesive. In this example, an energized heat-generating metal (2) is placed on a base material (1), EVA powder is placed on top of it as an adhesive (6), and a plywood (3) is further placed. When a current of IV and IOA was applied to the energizing metal (2), the temperature reached 150°C in about 1 minute and it became molten, and the current was immediately stopped and the metal was left at room temperature. The adhesion state was examined after 3 minutes, but both tensile stress and shear stress were observed.
It was as strong as the conventional method.

In FIG. 2, one of the members to be bonded is a wooden pallet deck member (4), and the other is a paper tube (5). A hexagonal aluminum foil with a thickness of 30 μm was used as the energized heat generating metal (2), and a 2-liquid crystal composite epoxy resin (1) was used as the adhesive (6). Place a paper tube (5) on aluminum foil with a knee hole, apply adhesive on top of it, adhere it to the baren 1-deck member, and apply electricity to the six-hole aluminum foil on the heat-generating metal (2) at 1.5V, 20Δ. When I turned on the power and left it, 5
The adhesion was completed within minutes. The conventional method required about 3 hours, so it was found that the workability was very good.

Effects of the Invention According to the method of the present invention, members to be bonded can be bonded together in a short time and with simple operations and equipment.

There is also no need for maintenance of the device.

[Brief explanation of drawings]

1 and 2 are perspective views showing how the present invention is implemented.

Claims (1)

[Claims] When bonding objects to be bonded such as wood or plywood using hot melt adhesive, etc., an energized heat-generating metal is placed between the objects to be bonded together with the adhesive, the adhesive is heated by electricity, and the adhesive is bonded by turning off the electricity. An adhesion method using a hot melt adhesive or the like, which is characterized in that the adhesive is solidified and the parts to be adhered are bonded together.