JPS59177160A - Adhesive coating method and apparatus - Google Patents

Abstract

PURPOSE:To coat a material in good efficiency, by a method wherein a particulate adhesive is thrown into a heating block and melted to be processed into a sheet which is, in turn, successively transferred and applied to the conveyed material to be coated through coating rolls contacts with the side surfaces thereof in a slide state. CONSTITUTION:A solventless type adhesive G pulverized in a separate process is successively supplied to a receiving chamber 14 partitioned and constituted by heating blocks 12 heated to a temp. for melting the adhesive, coating rolls 10 and adjusting rolls 11 through a supply means. The adhesive G is successively melted from the part contacted with the inner wall surface of the heating block 12 and withdrawn to be processed into a sheet at the gap between the coating rolls 10 contacted with the side surfaces of the material 3 to be coated through pressure bonding force regulating means 5 and the adjusting rolls 11. This sheet is successively applied to the side surfaces of the material 3 to be coated through the coating rolls 10 simultaneously rotated in the conveying direction of the material 3 to be coated. In a separate process, the coated material is heated to a set temp. to cure the adhesive G.

Description

[Detailed Description of the Invention] The present invention relates to an adhesive coating method and an apparatus therefor,
More specifically, the present invention relates to a novel coating method and apparatus for continuously coating an adhesive on the side surfaces of bars, shaped steel materials, etc. used for panel assembly, etc.

Conventionally, methods for applying adhesives to the surface of materials to be coated, such as rods and shaped steel materials, include (1) forming the adhesive into a film in advance, and applying this adhesive film to the surface of the material to be coated; A film adhesion method that attaches to the surface of.

(2) A method of applying a liquid adhesive using a sprayer.

(3) A melt method in which the adhesive is processed into a powder and then sprinkled onto the surface of the material to be coated.

(4) A method is used in which a molten adhesive is applied to the front and back surfaces of a material to be coated via a transfer roll.

However, in such conventional coating methods, the above (
In the case of 1), the adhesive must be processed into a sheet shape in advance, which requires a lot of effort and time, leading to a problem of increased costs.

Further, in the spray coating method in case (2) above, the adhesive itself has a high viscosity, and thick coating is extremely difficult. In addition, with the melt method described in (3) above, in which the adhesive is powdered and dispersed, it is possible to coat only the top surface of the material to be coated, making it difficult to coat two or more surfaces at the same time. . Furthermore, in the transfer roll method (4) above, it was difficult to coat only the upper and lower sides of the material to be coated, and it was difficult to coat the side surfaces.

In any case, with conventional coating methods, it is difficult to apply adhesive directly to the vertical sides of the material to be coated. There was a need for a method to do this.

This invention was devised by focusing on the conventional problems, and its purpose is to be able to simultaneously apply adhesive to multiple surfaces of a material to be coated, and particularly to An object of the present invention is to provide an adhesive coating method and an apparatus therefor, which can efficiently coat an adhesive on the vertical side surfaces of a.

In order to achieve the above object, the gist of the present invention is to apply a reactive curing type or true melt type solvent-free adhesive to the longitudinal side surface of a material to be coated using the following process order. It is something.

(a) Processing the solvent-free adhesive into powder form at low temperature in a separate manufacturing process.

(b) An adhesive that is divided into a heating block heated to a set temperature at which the adhesive melts, a coating roll, and an adjustment roll, in which the adhesive processed into powder shape is fed through a supply means. The process of sequentially supplying the storage chambers.

(c) A step of sequentially melting the adhesive supplied to the heating block starting from the portion that contacts the inner wall surface of the heating block.

(d) drawing out the adhesive melted in the heating block and processing it into a sheet in the gap between a coating roll and an adjustment roll that slide into contact with the side surface of the material to be coated via a pressure adjustment means; A step in which this sheet-like adhesive is sequentially applied to the side surface of the material to be coated via a coating roll that rotates in synchronization with the conveyance direction of the material to be coated.

(e) A step in which the adhesive applied to the front and back surfaces of the material to be coated is heated at a set temperature in a separate process to harden the adhesive.

Further, in this invention, a coating roll is rotatably disposed on the side surface of the material to be coated in a direction intersecting with the conveyance direction through a pressure adjusting means, and the coating roll is adhered in close proximity to the coating roll. An adjustment roll for processing the adhesive into a sheet is installed, and a hollow heating roller with an adhesive inlet is provided at the sliding contact area between the coating roll and the adjustment roll. A storage chamber for the adhesive is formed by an adjustment roll and a heating block, and the coating roll, adjustment roll, and heating block are each heated to a set temperature at which the adhesive melts through heating means, and the heating block is introduced. The gist is that a supply means for sequentially supplying a solvent-free adhesive processed into powder form is connected to the mouth.

The present invention will be described in detail below based on the accompanying drawings.

FIG. 1 shows an overall perspective view of an adhesive coating apparatus 1 embodying the present invention, in which 2 is a roller conveyor that conveys a material to be coated 3 such as a long bar or a shaped steel material, and 4 is a roller conveyor to be coated. This is a transfer roll device movably disposed near both side surfaces of the coating material 3 via a pressure adjusting means 5.

Adhesive G to be transfer coated via the transfer roll device 4
This method uses a reaction-curing or true-melt solvent-free adhesive, and is made into powder particles by cooling at approximately 20 degrees in a separate manufacturing process (e.g., kneader, extruder, pelletizer, etc.). Processed into shape. Also, does the adhesive G used in this invention already contain a low curing agent? It is blended under ML (40 to 60 degrees), and has the property of becoming viscous and liquid at around 80 degrees, and furthermore has the property of performing a rapid curing reaction around 120 degrees. On the other hand, the adhesive G also has the property of gradually undergoing reaction gelation even at around 80 degrees where it becomes liquid.

Here, the particle shape refers to, for example, a solvent-free adhesive G formed into a pellet or flake shape, and processed to a size that can be melted by heating at around 80 degrees. .

In the pressing force adjusting means 5, one end of a flat arm member 7 is pivotally supported via a pin 8 on a support stand 6 installed under the roller conveyor 2. The above-described transfer roll device 4 is placed therein. Further, a pressure cylinder 9 is interposed between the arm member 7 and the support base 6, and this pressure cylinder 9 moves the transfer roll device 4 toward and away from the side surface 3a of the material 3 to be coated, and at the same time The side surface 3a of the material to be coated 3 is pressed with a pressing force.

The transfer roll device 4 also includes a coating roll 10 rotatably supported on a support base 6, and an adjustment roll (doctor roll) 1 vertically fixed in proximity to the coating roll 10.
1, and a heating block 12 attached to the sliding contact portion X of the coating roll 10 and adjustment roll 11, each having a substantially triangular cross section.

The coating roll 10 and the adjustment roll 11 are used for the coating material 3
is arranged parallel to the side surface 3a and perpendicular to the roller conveyor 2, and the circumferential surface of the coating roll 10 protrudes toward the material to be coated 3 beyond the circumferential surface of the adjusting roll 11. A molten adhesive G having a certain viscosity, which will be described later, is transferred onto the side surface 3a. Further, the adjustment roll 11 is disposed at a predetermined gap from the coating roll 10, and forms the adhesive G melted into a sheet through the gap between the coating roll 10 and the adjustment roll 11.

The coating roll 10 and adjustment roll 11 are configured to be heated to a set temperature (approximately 80 degrees) at which the adhesive G is melted during coating through a heating device (not shown) embedded inside the coating roll 10 and adjustment roll 11. ing.

Next, the heating block 12 attached to the sliding contact portion and,
It consists of an upper weir plate 16 and a lower weir plate 17 that cover the upper and lower surfaces, and are detachably attached via bolts 18, respectively.

The sliding surface 15a of the block body 15 on the side of the coating roll 10 and the adjustment roll 11 is formed in an arc shape so as to be in sliding contact with the arcuate surfaces of the coating roll 10 and the adjustment roll 11 in a watertight manner. is configured to be heated to a set temperature (approximately 80 degrees) at which the adhesive G is melted during coating through a heating attachment 19 such as a heater. Also block body 1
Upper weir plate 16 attached to the upper and lower surfaces of 5. The end face of the lower weir plate 17 is also coated with the coating roll 1 in the same way as the block body 15.
It is formed in an arcuate shape so as to be in sliding contact with the arcuate surface of the adjustment roll 11 in a watertight manner. The storage chamber 1 is divided by the block body 15, the upper weir plate 16, and the lower weir plate 17.
A plurality of cutout recesses 20 are formed on the inner wall surfaces of the upper weir plate 16 and the lower weir plate 17 facing the 4th side in order to return the adhesive G left over during transfer to the storage chamber 14 side. The upper weir plate 16 also has an inclined sliding surface 13 of the block body 15.
An input port 21 is provided at the upper end of the housing, through which adhesive G processed into powder particles is continuously introduced.

A liquid reservoir 23 of the adhesive G is formed in the sliding contact portion X between the heating block 12 configured in this manner and the peripheral surface portions of the coating roll 10 and the adjustment roll 11.

The sliding surfaces of the coating roll 10 and the adjusting roll 11 that are in contact with the molten adhesive G, and the inclined sliding surface 13 of the block body 15. If the surface of the opening of the input port 21 of the upper weir plate 16 is coated with Teflon, silicone, etc. and subjected to mold release treatment, it will be easier to peel off the adhered adhesive G after the work is completed.

Next, an adhesive coating method according to an embodiment of the present invention will be explained.

First, the transfer roll device 4 is pressed against the side surface 3a of the material to be coated 3 with a predetermined pressure via the pressure cylinder 9 of the pressure adjustment means 5, and the coating roll 10. The adjusting roll 11 is heated to a predetermined temperature via a heating device (not shown), and the heating block 12 is also heated to a predetermined temperature via a heating device 19 or the like.

From this state, the material to be coated 3 is conveyed from the direction of the arrow on the first surface via the roller conveyor 2, and on the other hand, in another manufacturing process, the solvent-free adhesive is processed into powder form at low temperature. The adhesive G is sequentially introduced into the storage chamber 14 having the inclined sliding surface 13 from the input port 21 provided in the upper weir plate 16 of the heating block 12 by a supply means such as a hopper (not shown).

Then, the powder-shaped adhesive G introduced into the storage chamber 14 falls along the inclined sliding surface 13 and forms a liquid pool 2.
As the amount of adhesive G gradually increases, the adhesive G starts to melt from the portion that contacts the sliding surface 13 of the heated block body 15.

The melted adhesive g with high viscosity adheres to the circumferential surface of the coating roll 10 that rotates in synchronization with the movement of the material to be coated 3 conveyed by the roller conveyor 2 through the opening of the liquid reservoir 23. Then, it is drawn out while being heated, processed into a sheet in the gap between the coating roll 10 and the adjustment roll 11, and then sequentially transferred onto the side surface 3a of the material to be coated 3 being conveyed. .

Note that among the adhesives G put in the storage chamber 14 in the block body 15, the adhesive G on the center side
As the adhesive g is melted and drawn out at the same time as it comes into contact with the adhesive g, it sequentially moves to the heated sliding contact surface 13 side and is melted. Further, when the adhesive g is drawn out, the powder-shaped adhesive G that follows this and moves to the coating roll 10 and adjustment roll 11 side is the coating roll 10 and adjustment roll 11 heated to a predetermined temperature. Since it is melted by the roll 11, no separate problem occurs when transferring it to the material to be coated 3.

In the embodiment shown in FIG. 1, the case where the adhesive g is transfer coated on both side surfaces 3a of the material to be coated 3 is described, but it is of course possible to transfer the adhesive g only on one side. In this case, the transfer roll device 4 may be separated from the side surface 3a of one of the coated materials 3 via the pressure adjusting means 5.

In this invention, as described above, an adhesive that has been processed into a powder shape in a separate manufacturing process is put into a heating block heated to a predetermined melting temperature and melted. After being processed into a sheet, transfer coating is performed sequentially via a coating roll that slides against the side surface of the material to be coated as it is being conveyed. The adhesive can be transferred and coated continuously on the side surface in the direction intersecting the feeding direction, and therefore the adhesive coating work efficiency can be significantly improved.

In addition, since the adhesive is pre-processed into powder form, the supply of adhesive is easy and stable, and it is also easy to clean when the work is completed, and there is less space to clean. Maintenance is also extremely easy.

Further, the embodiments of the present invention can be effectively used for applying reaction-curing adhesives and true-melt adhesives.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of an adhesive coating apparatus embodying the present invention, FIG. 2 is a side view of a heating block, and FIG. 3 is an exploded perspective view of the heating block. 1. Adhesive coating device 3. Material to be coated 3a. Side surface 4 of material to be coated. Transfer roll device 5. Pressure force adjustment means 10. Coating roll 11. Adjustment roll 12.・Heating block 15...Block body G...Adhesive

Claims (1)

[Claims] (1) An adhesive characterized by applying a reaction-curing or hot-melt solvent-free adhesive to the longitudinal side surface of a material to be coated in the following process order: Coating method. (a) Processing the solvent-free adhesive into powder form at low temperature in a separate manufacturing process. (b) An adhesive that is divided into a heating block heated to a set temperature at which the adhesive melts, a coating roll, and an adjustment roll, in which the adhesive processed into powder shape is fed through a supply means. The process of sequentially supplying the storage chambers. (C) A step of sequentially melting the adhesive supplied to the heating block starting from the portion that contacts the inner wall surface of the heating block. (d) drawing out the adhesive melted in the heating block and processing it into a sheet in the gap between a coating roll and an adjustment roll that slide into contact with the side surface of the material to be coated via a pressure adjustment means; A step in which this sheet-like adhesive is sequentially applied to the side surface of the material to be coated via a coating roll that rotates in synchronization with the conveyance direction of the material to be coated. (e) A step in which the adhesive applied to the front and back surfaces of the material to be coated is heated at a set temperature in a separate process to harden the adhesive. 2. A coating roll is rotatably disposed on the side surface of the material to be coated in a direction perpendicular to the conveyance direction via a pressure adjustment means, and adhesive is applied to the sheet in close proximity to the coating roll. A conditioning roll to be processed into a shape is installed, a hollow heating block with an adhesive inlet is provided at the sliding contact portion of the coating roll and the conditioning roll, and the coating roll, conditioning roll, and heating block are connected to each other. A storage chamber for the adhesive is defined by the coating roll. The adjusting roll and the heating block are each heated to a set temperature at which the adhesive melts through heating means, and the solvent-free heat-reactive adhesive processed into powder is sequentially supplied to the input port of the heating block. An adhesive coating device characterized in that a supply means is connected.