KR19990045175A - Bonding Method and Bonding Device - Google Patents

Abstract

The present invention relates to a method of continuously and uniformly applying an adhesive and / or a curing agent to components of a material having different heights, and continuously applying the adhesive and / or curing agent to at least one surfaces of the components. The components are continuously fed through a roller spreader. Components of the material are supplied between at least one compression roller consisting of a cylinder provided with flexible bristles and one or more application rollers, the application rollers being provided with an adhesive or hardener to be applied to the surface, the adhesive or The curing agent is applied uniformly to the surface of the material. The invention also relates to an apparatus for carrying out the method.

Description

Bonding Method and Bonding Device

The present invention relates to a continuous application of adhesives or hardeners to materials such as wood, plastics, metals with different dimensions, such as, for example, wood lamellae in the manufacture of furniture. The method according to the invention also consists in the operation of continuously applying an adhesive or hardener on the surface of the components connectable by adhesion. The invention also relates to an apparatus for carrying out the coating method.

The simultaneous application of the adhesive to at least one side surface of the components bonded to each other by the rotary rollers (hereinafter the term "glue" refers to one or two adhesives of two components, such as adhesive and / or curing agent) Two components and one component of the adhesive) are commonly used methods. The adhesives are available on the top or bottom side (one side adhesive application) or both sides (double side adhesive application) of the materials to be bonded to each other.

Roller spreaders for each one side or double side adhesive application are known in the art. The roller spreader for one side adhesive application can be constituted, for example, by the feeding roller, the application roller and the adjusting roller shown in document EP-A-0 550 918 and FIG. 1.

The adjustment rollers provide a means for approximate adjustments in tangential application. Grooves are provided on the surface of the application roller. For example, if the application roller has a concave structure in contact with 150 g / m 2, the application of the adhesive can be controlled by the adjustment roller with a deviation of ± 10 g / m 2. There are also roller spreaders with adhesive trays instead of adjusting rollers. On the other hand, the distance between each application roller and the adjustment roller and the adhesive tray is controlled to adjust the adhesive application. It is essential that the correct groove of the application roller be selected for proper adhesive application.

The thickness change or material thickness change between the different components to which the adhesive is applied is typically about ± 0.5 mm. In order for the adhesive to be applied continuously and evenly over the entire surface, it is essential that the material is in continuous contact with the application roller. This can be done by applying pressure to the material against the application roller. In one side adhesive application, the pressure can be achieved by adjusting the distance between the application roller and the supply roller (not in contact with the adhesive), and in the double-side adhesive application, by the distance between the application rollers. . Also for previously adhesive application operations when the feed roller is not used, the top roller of the roller is positioned slightly higher than the plane of the conveying / feeding device, and the application roller is supported by the application roller when the component passes through the roller spreader. By positioning, simply take advantage of the gravity load of the components. In this case, however, the components may be inclined or inclined.

In the manufacture of components consisting of wood and bonded parts, especially parts of furniture, the number of lamellas of different heights (in the size of the width, or in the glued product when the lamellas are pressed together) It is assembled to the aggregate to be bonded. An example of such a production operation is the production of a chair seat having a length and a width of 600 mm and 500 mm, respectively. The sheets consist of 5 to 15 lamellaes of varying width but 600 mm in length. The width of the seat is 500 mm, but consists of 5 to 15 lamellaes. The furniture parts are bonded to one another, for example in hot presses, cold presses or high frequency lines.

Continuous application of the adhesive is carried out at the bottom of the lamellae by means of adhesive coating on one side. The lamellas are placed on the feeder of the adhesive spreader, the surface to which the adhesive is applied faces downward, the lengths of the surfaces are aligned in the feeding direction, and the lamellas are carried on the application roller. Since the lamellas have different heights and thicknesses, the lamellas have different weights, so that for some components the weight of the lamellas is such that the parts are in continuous and intimate contact with the adhesive on the application roller. It is not enough to make, which impairs the continuous and even application of the adhesive and leaves the area of the lower surface where the adhesive is not applied or only poorly applied. As a result, non-uniform and discontinuous application may be caused, and the yield associated with mass production may be abandoned. Most of the material components, in particular the components of the wood material, do not form a perfect shape, but very often this problem occurs because at least some bending or torsion occurs.

Thus, in order to coat the adhesive uniformly and continuously, according to the prior art, the roller spreader of this type with a feed roller is continuous with respect to the material, with different dimensions of small deviations of only ± 0.5 mm. Glue application is possible. When the dimensional change becomes larger and the feed roller becomes unavailable as a result, the components to be bonded are inclined, and the adhesive is unevenly and discontinuously applied, which results in a deterioration in product quality and overall abandonment of production. Throughout the adhesive application, inadequate lateral stability to the components in the required upright position will result in tilting. In order to properly contact the adhesive with the components, in order to raise the highest height of the top surface of the application roller relative to the feeder, the inclination phenomenon was increased even though the problem of unsuitable adhesive application was solved by the prior art. This also results in the risk of tilting the component in the feed direction.

The present invention provides a method and apparatus for performing the method that overcomes the above problems.

The method according to the invention consists in the continuous feeding of the components of the material through a roller spreader and the application of the adhesive and / or hardener to at least one of the surfaces of the components, the adhesive and / or Or the curing agent is applied continuously and uniformly to the components of the material having different heights. The components of the material are supplied between one or more compression rollers consisting of a cylinder provided with flexible bristles and one or more application rollers, the application rollers being provided with an adhesive and / or curing agent for application to the surface. An adhesive or hardener is evenly applied to the surfaces of the material.

The flexible bristles are preferably bent in contact with all the components of the material having different heights so that the components are evenly applied with an adhesive or hardener.

The width of the cylinder provided with flexible bristles exceeds the width of the components, while providing lateral stability to the components.

Adhesives selected from urea formalade adhesives, melamine-urea-formalade adhesives, phenol-resosocinol adhesives, polyvinylacetate based adhesives, emulsion polymerized isocyanate adhesives and polyurethane complexes are used.

An apparatus according to the invention, comprising means for supplying components of a material to one or more applicator rollers, and means for supplying an adhesive or hardener to each of said applicator rollers, Adhesives or hardeners are applied uniformly and continuously uniformly to the components of the material having different heights. The apparatus of the present invention consists of one or more flexible compression rollers composed of a cylinder provided with flexible bristles, and means for feeding are arranged for supplying said components of material between the compression roller and the application roller.

The compaction roller and the application roller are arranged at a distance from each other so that the flexible bristles bend and contact with the surfaces of all the components of the material having different heights.

In addition, a means for independently controlling the speed of the application roller and the compression roller is configured.

1 is a schematic side view of a prior art roller spreader for one side adhesive application;

2 is a side view of an embodiment of a roller spreader in accordance with the present invention.

3 is a front view of the embodiment of FIG.

Description

200 ... material 205 ... wood lamellae

207 ... lower surface 209 ... lamella

210 ... conveyor belt 240 ... application roller

250 ... doctor roller 260 ... extrusion roller

270 ... cylinder 280 ... bristle

2 and 3 are one embodiment of the invention and do not limit the scope of the invention.

The method according to the invention is explained in more detail with reference to FIGS. 2 and 3. The process according to the invention is carried out by a roller spreader comprising one or two or more flexible compression rollers according to the invention, for example different ones such as wood lamellae 205. And simultaneously attaching an adhesive to the material 200 of the dimension, said wood lamellae for forming a bonded product, for example a layered wood or block wood, or for forming furniture components. Can be compressed with each other.

Referring to FIG. 2, in accordance with the present invention there is provided a material 200 to be adhered to, for example, a wood lamella, on a roller spreader (such as conveyor means 210, 215 in the drawing), and an adhesive ( 290 is applied to the lower surface 207 of the material by means of an application roller 240 and subsequently removed by the conveyor belt 215 to remove fragments released from the roller spreader. The method is performed.

The materials 200 to be bonded by the conveyor belt 210 are conveyed to a roller spreader. According to the present invention, the roller spreader shown in FIG. 2 is composed of an application roller 240, a doctor roller 250 to which an adhesive 290 is supplied, and a flexible compression roller 260.

A portion of the material is then rotatable 90 degrees about the longitudinal axis of each lamellae and another lamella 209 shown in FIG. 3, with no adhesive for application and remaining unpaired. A portion of the material and the lamellae form furniture components, which are for example in hot presses, cold presses or frequency press lines. Are sequentially compressed with each other.

For example, the length of lamellae can range from 50 cm to 4 m.

As can be seen in FIGS. 2 and 3, the flexible compression roller 260 according to the present invention consists of a cylinder 270 with a bristle 280.

Referring to FIG. 2, the maintenance roller 250 is also replaceable with an adhesive tray and optionally an adhesive transfer roller. Thus, an adhesive tray with a maintenance roller 250, adhesive tray or adhesive delivery roller is independently available for each one or more rollers for the supply of adhesive or hardener. However, the means for supplying the adhesive to the application roller, in which the amount of the adhesive supply can be properly controlled, is not limited to a specific method.

According to the present invention, the operation of continuously applying the adhesive on the surface to be adhered applies pressure to the respective portions against the application roller 240 to be adhered, and at the same time the side and the sides of the portions as shown in FIG. It can be made by the bristle 280 is a parallel support action. In addition, since the top surfaces of the application roller 240 and the conveyor belts 210 and 215 are preferably provided in the same plane, tilting and tilting are prevented.

The speed of each application roller 240 and flexible compression roller 260 can be controlled independently so that a suitable material supply is made throughout the roller spreader. For example, the material feed rate over a roller spreader is about 20 m / min to 50 m / min and typically about 30 m / min. The location of the rollers to create the required minimum pressure on the components of the material, to form a suitable gap between the rollers, even to assume continuous contact with the lower surface of the components by means of an adhesive on the application roller. In particular, the distance between the application roller and the flexible compression roller can be controlled by controlling the position of the compression rollers.

The bristles should be in contact with the minimum size components such that the bristles bend slightly to the top surface of the components, and, as a suitable example, about the height of the components on the passage of the components over a roller spreader. 1/2 may overlap.

Commercially available flexible compression rollers are available and consist of a brush roll that accommodates dimensional differences of material height of at least about 100 mm, suitably at least 50 mm. The brush roll should be soft and elastic so as not to adversely affect the lamellae speed in the feed direction. The width of the component part of the material supplied by the width of the brush roll is extended (refer to FIG. 3), and it is preferred to provide side stability to the component part. For example, the diameter of the brush roll is about 300 mm, and the width of the brush roll is preferably about the same as that of the application roller.

Referring to FIGS. 2 and 3, the flexible material of the brush roll according to the present invention may be made of, for example, other plastic materials such as polyamide or polypropylene or spring steel, glass fiber materials. Or bristles 280 made of natural fiber material, which are provided radially essentially from the center of the axis of rotation. The bristles have a cross section of round, square or rectangular or other suitable geometric shape. The diameter of the bristles ranges from about 0.1 mm to about 2.0 mm, and the length ranges from about 100 mm to about 300 mm. As long as the bristles have the required elasticity, the special shape and material of the bristles is not critical, for example the material of the cylinder 270 is, for example, a metallic material or a plastic material such as polyethylene.

For example, a suitable brush roll is 1.5 mm in diameter and consists of polyamide bristles, is attached to the cylinder 270 in a bundle, and the spacing between adjacent bristles along the length of the cylinder is 10 mm and 7.5 mm. Have an axial distribution of mm. The spacing between two adjacent bundles can be about 2-10 mm in all directions. For example, 22 bundles can be provided around a cylinder 270 having an outer diameter of 80 mm.

Optionally or essentially a pair of brush rollers arranged in a V-shape or eg bonded with a "V" shaped tip facing the outlet side of the roller spreader in combination with the present invention Further means for anti-tilt can be provided, such as a pair of arms placed on the outer sides of the parts and subjected to elastic forces.

The roller spreader, which is described with reference to the embodiments of the present invention and which consists of only one application roller and one flexible compression roller, is also configurable with two or three or more of the above rollers, the number being each It is understood that can be selected independently for.

Adhesives used in the wood processing industry and with the present invention are, for example, urea-formaldehyde adhesives, melamine-urea-formaldehyde adhesives, phenol-resorches Phenol-resorcinol adhesives, polyvinyle acetate based binders, emulsion polymerized isocyanate adhesives and polyurethane adhesives.

As described in relation to the adhesive, besides the adhesive, for example, the roller spreader of the present invention is used to separate and apply the curing agents (implied in the term "glue") of a two-component adhesive to the components. It is possible to apply the adhesive component successively on the components. For example, a curing agent suitable for adjusting a formaldehyde based or an aminoresin based adhesive is possible. The curing agent can also be mixed with the adhesive and applied to the component itself.

The surface material of the application roller, in which the grooves are configured, is a suitable material of the prior art such as steel, rubber or plastic having sufficient inertness to the specific adhesive or hardener to be applied.

The material of the components intended for application of the adhesive or hardener according to the invention is, in addition to wood, for example a suitable plastic or metal material.

Claims (10)

Continuously supplying the components of the material through a roller spreader and applying the adhesive and / or hardener to at least one of the surfaces 207 of the component. In a method for continuously and uniformly applying 290 to components 205 of material having different heights, The components of the material are supplied between one or more compression rollers 260 composed of a cylinder 270 provided with flexible bristles 280 and one or more application rollers 240, and the application rollers An adhesive and / or curing agent is provided for application to a surface, wherein the adhesive or curing agent is uniformly applied to the surfaces of the material. The method of claim 1 wherein all the components of the material having different heights and the bristles are bent to contact. The method of claim 1, wherein the width of the cylinder provided with flexible bristles exceeds the width of the components, while providing lateral stability to the components. 3. Method according to claim 1 or 2, characterized in that the speeds of the application rollers (240) and the compression rollers (260) are controlled independently. According to the preceding claims, an adhesive selected from urea formalade adhesive, melamine-urea-formalade adhesive, phenol-resosocinol adhesive, polyvinyl acetate based adhesive, emulsion polymerized isocyanate adhesive and polyurethane complexes is used. Characterized in that the method. Means 210, 215 for supplying components of the material to one or more applicator rollers, and means for supplying adhesive or hardener 290 to each of said applicator rollers, Apparatus for applying the adhesive or the curing agent uniformly and continuously uniformly to components of materials having different heights, The flexible bristle 280 consists of one or more flexible compression rollers 260 consisting of a cylinder 270 provided, and a paragraph for supply for supplying the above components of material between the compression roller and the application roller is provided. Device arranged. 7. The apparatus according to claim 6, wherein the compression roller and the application roller are arranged at a distance from each other such that the flexible bristles are bent in contact with the surfaces of all the components of the material having different heights. 8. Apparatus according to claim 6 or 7, wherein means for controlling the speeds of the application rollers (240) and the compression rollers (260) independently are configured. The device of claim 6, wherein the width of the cylinder provided with flexible bristles exceeds the width of the components, while providing lateral stability to the components. 10. The device of claim 6 to 9, wherein the bristles (280) accommodate a height difference of the components up to about 100 mm.