JPS59177159A - Adhesive coating method and apparatus therefor - Google Patents

Abstract

PURPOSE:To coat a material in good efficiency, by a method wherein a solventless thermally reactive type adhesive is formed into a particulate form which is, in turn, melted to be formed into a sheet before transferred to the material to be coated while said sheet is successively transferred to the front and back surfaces of the material to be coated and cured under heating. CONSTITUTION:A solventless type adhesive 2 in a container 1 pulverized in a separate process is dispersed and supplied to the liquid sump 6 partitioned and constituted by a coating roll 3 heated to a temp. for melting the adhesive, an adjusting roll 4 and a weir plate 5 through a transport means 12. This particulate adhesive is melted to be processed into a sheet while passed through the gap of the coating roll 3 and the adjusting roll 4. This sheet is successively transferred to the front and back surfaces 1a of a material 1 to be coated while follows the conveying direction thereof. The adhesive 2 applied to the front and back surfaces 1a of the material 1 to be coated is heated to a set temp. in a separate process to cure the adhesive 2.

Description

[Detailed Description of the Invention] The present invention relates to an adhesive coating method and an apparatus therefor,
More specifically, a solvent-free heat-reactive adhesive is supplied in the form of powder, and the powder-shaped adhesive is heated and melted to transfer it to the material to be coated, and then the adhesive is heated to a predetermined temperature. The present invention relates to a method for applying an adhesive and an apparatus therefor, which is heated to cure the adhesive.

Conventional coating equipment using coating rolls equipped with adjustment rolls uses a pump or screw extruder to supply adhesive to the liquid pool formed by the coating roll and adjustment roll. is commonly used.

However, with such conventional coating equipment, if the adhesive is a reactive adhesive, it must be cleaned after use, and since a solvent is used for cleaning, there are safety and hygiene management issues. There was a problem in that it required a lot of effort and time.

On the other hand, a coating method is known in which the adhesive is powdered, the adhesive is dispersed onto the coating surface of the material to be coated, and the entire surface is heated and melted. However, in the case of this coating method, most of the materials to be coated are limited to flat plates, and it is extremely difficult to selectively apply adhesive to uneven surfaces such as both sides of a honeycomb. However, there was a cost problem as there was a lot of waste in the adhesive.

This invention was developed by focusing on the conventional problems, and its purpose is to process the adhesive to be applied to the material to be coated so that the reaction does not occur during the supply stage. While improving the cleaning workability of the coating equipment, it also solves safety and hygiene management problems before they occur, and can also transfer adhesive regardless of the shape of the material to be coated. In addition, the present invention provides an adhesive coating method and apparatus that can efficiently coat a material to be coated without using unnecessary adhesive.

In order to achieve the above-mentioned object, the gist of the present invention is to transfer a reaction-curing or hot-melt solvent-free adhesive to the front and back surfaces of a material to be coated using the following process sequence.

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

(b) The adhesive processed into the powder shape is transported through a means of transportation to an adhesive partitioned by a coating roll, an adjustment roll, and a weir plate that are heated to a set temperature at which the adhesive melts. A process of distributing and supplying liquid to a pool.

(c) A step of heating and melting the adhesive supplied to the liquid reservoir and sequentially processing the molten adhesive into a sheet form through a set gap between a coating roll and an adjustment roll.

(d) A step of sequentially transferring a sheet-like adhesive formed on the circumferential surface of the coating roll to the front and back surfaces of the material to be coated, following the conveyance direction.

(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, an adhesive liquid pool is formed by a weir plate, a coating roll heated to a set temperature that melts the adhesive, and an adjustment roll, and powder particles are added to this liquid pool in advance in a separate manufacturing process. A transportation means is connected to sequentially disperse and supply a solvent-free heat-reactive adhesive processed into a shape, and a coating roll heated to the set temperature is rotatably and slidably contacted to the front and back surfaces of the material to be coated. The gist of the present invention is that the coating material is parallel to the direction intersecting the direction of conveyance of the material to be coated.

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

FIG. 1 shows a perspective view of a coating device embodying the present invention.
(2) indicates, for example, a honeycomb-shaped plate or bar material that is conveyed via a conveyor (not shown).

A material to be coated such as a shape material, the front and back surfaces 1 of this material to be coated 1
The melted adhesive 2 having a constant viscosity is transferred onto a (coated surface 1a). This adhesive 2 uses a reaction-curing or hot-melt solvent-free adhesive, and is prepared in advance in a separate manufacturing process (for example, using a kneader, extruder, Pellequiza, etc.) to
It is processed into powder form under cooling at a certain temperature. In addition, the adhesive 2 used in this invention has a hardening agent already at a low temperature (40 degrees to
It is blended at a temperature of 60 degrees), has the property of becoming viscous and liquid at around 80 degrees, and furthermore has the property of performing a rapid curing reaction at around 120 degrees. On the other hand, the adhesive 2 also has the property that reaction gelation gradually progresses even at around 80 degrees where it becomes liquid.

Here, the powder shape refers to, for example, a solvent-free adhesive 2 formed into a pellet or flake shape, and processed into a size that can be melted by heating at around 80 degrees. .

On the coating surface la of the material to be coated 1, a coating roll 3 and an adjustment roll (Dokuroll) 4 are disposed in parallel in a direction perpendicular to the conveying direction of the material to be coated 1, and this coating roll 3 is rotatably installed in sliding contact with the coating surface 1a of the material to be coated 1, and the adjustment roll 4 is installed in a fixed state with a predetermined gap from the coating roll 3.

The coating roll 3 and the adjustment roll 4 are heated with adhesive 2 during coating via a heating device (not shown) embedded therein.
The coating roll 3 and adjustment roll 4 are heated to a set temperature (approximately 80 degrees) at which they are melted, and above the coating roll 3 and adjustment roll 4 there is a weir plate surrounding the coating roll 3, adjustment roll 4, and both sides thereof. A dispersion supply device 7 for uniformly distributing and supplying the powder-shaped adhesive 2 to a substantially V-shaped liquid reservoir 6 defined by 5 is installed in parallel.

Note that the coating roller C3 and the adjustment roll 4 are in contact with the melted adhesive 2. If the surface of the weir plate 5 is coated with Teflon, silicone, etc. and subjected to mold release treatment, it will be easier to peel off the adhesive 2 that has adhered after the work is completed.

The box-shaped supply gutter 8 constituting the distributed feeding device 7 includes a tall weir 8a and a short gutter 8 in its longitudinal direction.
b, and partition plates 8c that are taller than the gutter 8a on both sides, and the adhesive 2 is placed in the liquid pool 6 in the shorter gutter 8b.
A guide plate 9 is integrally formed to allow the water to flow down one after another.

Further, the supply gutter 8 of the distributed supply device 7 is connected to the vibration generator 1.
When the adhesive 2 is supplied into the supply gutter 8, this vibration generator 10 vibrates the supply gutter 8 in the vertical direction alternately from front to back and left and right, thereby causing the adhesive 2 to become uneven. In addition to preventing this, the liquid is evenly distributed and supplied to the liquid reservoir 6.

At the upper part of one end side of the supply gutter 8 in the distributed supply device 7, there is a transport means 1 connected to a container 11 containing the adhesive 2.
Two supply pipes 13 are connected. There are 12 means of transportation
is a separator 15 to which one θ 111 of the supply pipe 13 is connected via a valve 14, a blower 16 and an exhaust pipe 17 installed in the separator 15, and an adhesive 2 connected to the side of the separator 15. It is composed of a suction pipe 18.

Then, by driving the blower 16, the adhesive 2 is sucked into the separator 15 together with the air from inside the container 11, and after separating the air and the adhesive 2, the supply amount is adjusted to the valve 1.
4 into the supply gutter 8 by the supply pipe 13.
is distributed evenly.

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

First, the adhesive 2, which is a solvent-free heat-reactive adhesive processed into powder form at low temperature in a separate manufacturing process, is supplied into a container 11 and housed therein. Next, the powder-shaped adhesive 2 and air in the container 11 are sucked into the separator 15 constituting the transportation means 12 through the suction pipe 18 by driving the blower 16.
Then, the adhesive 2 and air are separated in the separator 15,
Only air is exhausted to the outside via the exhaust pipe 17.

The separated adhesive 2 is passed through a valve 14 whose supply amount is adjusted.
It is distributed and supplied into the supply gutter 8 of the distributed supply device 7 via the supply pipe 13 . Before supplying the adhesive 2, the supply gutter 8 is vibrated back and forth and in the left and right directions via a vibration generator 10 so that the adhesive 2 is not biased and is evenly distributed. The adhesive 2 supplied into the supply gutter 8 is sequentially moved to the shorter weir 8b side by the vibration feeding of the vibration generator 10, and when the adhesive 2 fills the supply gutter 8, it moves to the weir 8b side. The liquid flows out into the reservoir 6 along a guide plate 9 formed integrally with the liquid.

The adhesive 2 formed in the shape of powder and collected in the liquid reservoir 6 comes into contact with the peripheral surfaces of the coating roll 3 and the adjusting roll 4, which have been heated to a melting temperature in advance, and becomes a viscous liquid adhesive. 2
a, and is formed into a sheet through the gap between the coating roll 3 and adjustment roll 4 that rotate in synchronization with the movement of the material 1 to be coated, and then transferred to the front and back surfaces 1a of the material 1 to be coated. .

The coated material 1 to which the adhesive 2a has been transferred is then heated to a set temperature (approximately 120 degrees) in the next step, and the adhesive 2a is cured at this heating point.

Through the steps described above, the adhesive 2a is transferred and applied to the front and back surfaces 1a of the material 1 to be coated, which are sequentially conveyed by the conveyor.

This invention involves processing a solvent-free heat-reactive adhesive into a powder form as described above, and then melting and processing it into a sheet before transferring it to a material to be coated. is sequentially transferred to the front and back surfaces of the material to be coated, and then cured by heating the adhesive in a separate process, making it extremely easy to clean the coating equipment. Because it uses a material that has been processed into a shape, it is extremely effective in terms of safety and hygiene management.Furthermore, the adhesive can be transferred regardless of the shape of the material to be coated, and it also eliminates wasted adhesive. It has the effect of being able to coat the material to be coated with a high reno rate without using it.

Furthermore, since the device itself is relatively simple, it can be manufactured at low cost and maintenance is easy.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view of an adhesive coating apparatus embodying the present invention, and FIG. 2 is a sectional view taken along line nn in FIG. 1. L... Material to be coated 1a... Front and back surfaces of the material to be coated 2.2a... Adhesive 3... Coating roll 4... Circumference roll 5... Weir plate 6... Liquid pool 7...・Distributed supply device 12 ・Transportation means 15 ・Separator agent Shin Ogawa, patent attorney - Satoshi Noguchi, patent attorney Kazuhiko Saishita, patent attorney Teru

Claims (1)

[Scope of Claims] 1. Adhesive coating characterized by transferring a reactive curing type or phototomel 1~ type solvent-free adhesive to the front and back surfaces of a material to be coated by the following process order. Construction method. (a) Processing the solvent-free adhesive into powder form at low temperature in a separate manufacturing process. (b) The adhesive processed into the powder shape is transported through a means of transportation to an adhesive partitioned by a coating roll, an adjustment roll, and a weir plate that are heated to a set temperature at which the adhesive melts. A process of distributing and supplying liquid to a pool. (c) A step of heating and melting the adhesive supplied to the liquid reservoir and sequentially processing the molten adhesive into a sheet form through a set gap between a coating roll and an adjustment roll. (d) A step of sequentially transferring a sheet-like adhesive formed on the circumferential surface of the coating roll to the front and back surfaces of the material to be coated, following the conveyance direction. (e) A process in which the adhesive coated on the front and back surfaces of the material to be coated is heated at a set temperature in a separate process to melt the adhesive again and form an adhesive. 2. The weir plate and the coating roll and adjustment roll, which are heated to a set temperature that melts the adhesive, form an adhesive pool, and this liquid pool is processed into powder form in a separate manufacturing process in advance. A transportation means is connected to sequentially disperse and supply the solvent-free thermally reactive adhesive, and a coating roll heated to the set temperature is rotatably brought into sliding contact with the front and back surfaces of the material to be coated, An adhesive coating device characterized in that the adhesive coating device is disposed parallel to a direction intersecting the conveying direction of a material to be coated.