JPH0366027B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an apparatus for applying a coating agent to the outer surface of a long object having a constant cross-sectional shape perpendicular to the longitudinal direction.

When applying adhesive, paint, or other coating agent to a long object, for a specific part (or the entire part) of the outer periphery in a cross section perpendicular to the longitudinal direction of the long object,
Continuous application is performed along the longitudinal direction of the elongated object. For example, long rubber or plastic products obtained by extrusion molding are coated with an adhesive for flocking or painted.

Hereinafter, for the sake of convenience, we will specifically explain a bead, which is a part of the upholstery of a seat used in automobiles and other vehicles, as an example of a long object.

FIG. 1 is a process diagram showing the manufacturing process of the bead.
Soft vinyl chloride is extruded from an extruder 1 to form a beading material 2 having a cross-sectional shape as shown in FIG. 2. [FIG. 2 is a cross-sectional view of the beading material 2 taken along the line -' in FIG. 1.] . The material 2 has a shape in which two flange portions 2a (usually having a hollow portion 2b) are connected by a fin ridge portion 2c, and its dimensions are, for example, an outer diameter of the flange portion of 4 mm, an inner diameter of the flange portion of 2 mm, and a fin portion of the fin portion. The width of the strip is 11mm. The extruded beading material 2 is transferred to a take-up roll 3
The material is guided to a cooling tank 4 and cooled and hardened with cooling water 5 and the like. Next, the beading material 2 is dried while running.
It is dried and cooled in the cooling oven 6, and the urethane adhesive 8 is applied only to the outer surface of the welt portion 2a of the welt material 2 by the adhesive coating device 7 as shown in FIG. FIG. 1 is a sectional view of the bead material 2 at the line -' in FIG. 1. Before the adhesive 8 dries and hardens, a pile 10 of nylon with a length of about 0.9 mm and a thickness of about 2.5 denier is flocked on the welt portion 2a of the welt material 2 as shown in FIG. 4 using an electrostatic flocking machine 9. [FIG. 4 is a cross-sectional view of the welt material 2 at the line -' in FIG. 1]. The electrostatic flocking machine 9 charges the welding material 2 with static electricity and scatters the pile 10, thereby planting the pile 10 in an upright manner on the adhesive on the outer surface of the welt portion 2a of the welding material 2. Flocked bead material 2
is meandered through a drying oven 11, where the adhesive is dried and hardened and the bead material 2 is annealed, and then the material 2 is meandered through a cooling tank 12 and cooled by cold air. The pile-flocked welt material 2 is taken up by the take-up/dividing roll 13, and its fin strips 2c are divided into wavy lines.
Two bead edges 2A having a shape as shown in FIG. 5 are formed, and each of them is wound up by the winding roll 14 [FIG.
FIG. 2 is a cross-sectional view of the bead 2A and a plan view of the bead 2A].

Conventional adhesive applicators used in the above-mentioned bead manufacturing process include those that bring the tip of the brush into contact only with the welt portion 2a of the bead material 2 and supply a predetermined amount of adhesive to the brush, and roll coaters. method was used. However, the adhesive used here has a viscosity of, for example, 4500 to 5000 cps.
Because of this, the conventional apparatus described above cannot perform satisfactory coating. That is, it is difficult to uniformly apply the adhesive over the entire surface to be applied, and it is also difficult to apply the adhesive neatly to the boundary between areas where it should be applied and areas where it should not be applied [i.e. There is no clear line of separation,
In addition, adhesive threading tends to occur, resulting in uneven coating, and it is also difficult to adjust the amount of adhesive applied.

It is an object of the present invention to provide an improved coating device that does not have the drawbacks of the conventional coating devices for long articles as described above.

The above purpose is to continuously coat a long object with a constant cross-sectional shape perpendicular to the longitudinal direction on a specific part or the entire outer periphery of the cross-section while the long object is running in the longitudinal direction. In a device for applying a coating agent, the coating agent distribution chamber into which the coating agent is introduced is formed on the joint surface of the base and the lid at least on one of the base and the lid and has a flat surface perpendicular to the running direction of the long object. The coating agent distribution chamber is provided with a long object inlet and a long object outlet that allow the long object to run as if cutting out or penetrating the distribution chamber. The shape of the inlet and outlet is such that an appropriate clearance is provided to the coated area on the outer periphery of the cross-sectional shape of the long object.
Moreover, on the inner surface of the elongated object outlet, a plurality of holes are provided on the inner surface of the elongated object, which function to uniform the distance between the inner surface and the surface of the elongated object to which the coating agent is applied, and to make the thickness of the coating agent uniform. This is achieved by the coating apparatus of the present invention, which is characterized in that a projection is provided, and a coating agent introduction means is connected to the coating agent distribution chamber.

Hereinafter, the present invention will be specifically explained in more detail based on the drawings. Here again, we will take the bead material as an example of a long material for convenience.

FIG. 6 is a schematic diagram of the coating device according to the present invention, and FIG. 7 is an exploded perspective view of the vicinity of the coating agent distribution chamber. The apparatus of the present invention is equipped with a coating agent distribution chamber 20. The circulation chamber 20 has a flat shape, and the seventh
As shown in the figure, it is formed between the base 21 and the lid 22 by joining them together. That is, the joint surface of the base 21 with the lid 22 has a certain depth (for example, 1
A recess 23 with a diameter of 1 mm) is formed, and the joint surface of the lid 22 with the base 21 is flat. In order to maintain the connection, the base portion 21 and the lid portion 22 may be screwed together at four corners. The coating agent distribution chamber 20 is provided with a long article inlet 24 and a long article so that one of the adhesive application surfaces of the beading material 2, that is, one of the webbing portions 2a, can run in a direction substantially perpendicular to the flat shape of the coating agent distribution chamber 20. A material outlet 25 is provided. The cross-sectional shape of the inlet 24 and the outlet 25 in a plane perpendicular to the running direction of the welt material 2 corresponds to the shape of the cross section perpendicular to the longitudinal direction of the welt portion 2a of the welt material 2, and the size thereof is a size with an appropriate clearance attached to the outer periphery of the cross-sectional shape of the welt portion 2a of the welt material 2. Here, the clearance can be appropriately determined depending on the desired thickness of the adhesive layer, the viscosity of the adhesive, etc., and may be different between the inlet 24 and the outlet 25. In the device of the present invention, the long object outlet 2
A protrusion 25a is provided on the inner surface of 5. This protrusion 25a is a linear protrusion extending in the running direction of the welt material 2 as shown in the figure. Each protrusion 25a has a height such that the top thereof contacts the outer surface of the welt portion 2a of the beading material 2, so that the beading material 2 can reach the outlet 25.
Uniquely determine the position where it passes. Protrusion 25a
There is no particular limit to the number, as long as it is at least the minimum number necessary for such position determination. still,
A protrusion similar to that at the elongated object outlet 25 may also be formed at the elongated object inlet 24. Since no adhesive is applied to the fin strips 2c of the beading material 2, the long article entrance 24
The outlet 25 cuts out the coating agent distribution chamber 20 only in the portion corresponding to the welt portion 2a of the welt material 2. A portion corresponding to the fin strip 2c is formed as a slit 26 that communicates with the outside. Lid part 2
A coating agent introduction port 27 communicating into the coating agent distribution chamber 20 is formed in 2 . Coating agent distribution room 20
The introduction port 27 is preferably opened at the end opposite to the elongated object inlet 24 and outlet 25. The base portion 21 is formed with a mounting portion 29 for attaching to a pole 28 such as a stand, and 30 is a bolt hole for tightening. Coating agent inlet 2
A coating agent introducing means 31 is connected to 7.
The introducing means 31 is, for example, a Teflon tube for introducing the adhesive from a coating agent container 33 housed in a pressurized tank 32, and the pressurized tank 32 is equipped with an air supply means 35 (compressor) equipped with a pressure reducing valve 34. etc.) are connected.

FIG. 8 is a plan view and a sectional view of a base 21 for forming a coating agent distribution chamber in another embodiment of the present invention. In this specific example, a coating agent inlet 27 is formed on the base 21 side, and a block 36 is further formed in the circulation chamber 20 for restricting the distribution of the coating agent.

In the above specific example, the joint surfaces of the lid 22 and the base 21 are all flat, but the flow chamber 20 is configured by making the joint surface of the base 21 flat and forming a recess in the lid 22. It goes without saying that the flow chamber 20 may be formed by forming a recessed portion on the joint surfaces of both the base portion 21 and the lid portion 22. In this way, by configuring the coating agent distribution chamber by the flat recess formed in at least one of the base and the lid at the joining surface of the base and the lid, the distribution chamber can be easily created, and the structure can be further improved. Since it is simple, maintenance and repair are easy.

FIG. 9 is a partial plan view of the base 21 showing another example of the protrusion 25a of the elongated object outlet 25 of the coating apparatus of the present invention. The protrusion 25a may have any other suitable shape.

When using the coating device for long objects as described above, as shown in FIG.
5 through the welt portion 2a of the welt material 2 and run in the longitudinal direction at a constant speed, for example, 5 m/min. At the same time, the pressurized tank 3 is supplied through the air supply means 35.
Appropriate pressure (for example, gauge pressure of 0.5 to 0.7 kg/cm ² ) is applied within the coating agent 2 to introduce the adhesive from the coating agent introduction means 31 into the coating agent distribution chamber 20 . The adhesive introduced into the circulation chamber 20 reaches the elongated article inlet 24 and the outlet 25, where it is applied to the welt portion 2a of the traveling welt material 2. Ball section 2
Since there is a predetermined clearance between a and the long object outlet 25, an adhesive layer is formed on the outer surface of the webbing portion 2a exiting the outlet 25 to a thickness corresponding to the clearance. However, since a protrusion 25a is formed at the elongated object outlet 25, an adhesive layer is formed in the beading material 2 immediately after passing through this, with the portion corresponding to the protrusion 25a being scraped off. . However, after a short period of time, the adhesive layer becomes smooth due to surface tension. At this time, the thickness of the adhesive layer becomes thinner than the above-mentioned clearance, so in order to obtain the desired adhesive layer thickness, the clearance is determined in advance in anticipation of this thickness reduction. In addition, in Fig. 6, the bead material 2
Although the adhesive is applied only to one of the webbing portions, in the actual process, the adhesive is applied to the other bead portion at the same time using a similar coating device.

According to such a coating device of the present invention, the distribution chamber 20
The adhesive introduced into the welt portion 2a of the welt material 2
Since the adhesive is applied with uniform pressure to the outer surface of the adhesive, there will be no uncoated adhesive, and the parting line is formed in a desired clear straight line at the boundary between the welt part 2a and the fin part 2c. be done. Furthermore, the thickness of the applied adhesive layer can be adjusted by changing the traveling speed of the welt material 2 or the pressure at which the adhesive is introduced. Furthermore, since the protrusion 25a is provided at the elongated object outlet 25, the beading material 2 does not shake when passing through the coating device of the present invention, and therefore the thickness of the applied adhesive layer can be reduced to the entire coating surface. can be kept constant over time. In addition, the protrusion 25a provided at the elongated object outlet 25
Since the bead material extends in the running direction, when passing through the outlet 25, the bead material is reliably maintained in a predetermined running direction without taking a twisted attitude with respect to the outlet, and stable adhesive application is possible. It is possible. Furthermore, since the coating agent distribution chamber 20 is flat and the beading material 2 runs in a direction perpendicular to the coating agent distribution chamber, the welt portion 2a of the beading material 2 may sag or vibrate within the coating agent distribution chamber 20. The entire welt portion 2a is in contact with the adhesive for a uniform period of time, and thus an adhesive layer of uniform thickness can be formed despite the simple structure.

In the above explanation, the beaded material was exemplified as a long object, but the long objects to which the device of the present invention can be applied include all long objects such as rubber weather strips and rubber glass runs used in automobiles, etc. Includes shakumono. The apparatus of the present invention also includes one for applying a coating agent to the entire outer surface of a long object. In this case, the elongate object inlet and outlet may be arranged so that the elongate object passes through the coating agent distribution chamber.
Further, the coating agent applied by the apparatus of the present invention may include paints in addition to adhesives, and the apparatus of the present invention is particularly suitable for applying high-viscosity coating agents.

[Brief explanation of drawings]

Figure 1 is a manufacturing process diagram of the bead, and Figures 2 to 4 are -', -' and - of Figure 1, respectively.
FIG. 5 is a cross-sectional view and a plan view of the bead material at -' in FIG. 1, FIG. 6 is a schematic configuration diagram of the coating device of the present invention, The figure is an exploded perspective view of the vicinity of the coating agent distribution chamber, FIG. 8 is a plan view and a sectional view of the base for configuring the coating agent distribution chamber, and FIG. FIG. 2... Beading material, 2a... Beading part, 2c... Fin thread part, 2A... Beading part, 20... Coating agent distribution chamber, 21... Base, 22... Lid part, 23... Recessed part, 24... Long object entrance, 25... Long object outlet, 25a... Protrusion, 26... Slit, 27... Coating agent introduction port, 31... Coating agent introduction means, 32... Pressurized tank, 33... Coating agent container,
34...Pressure reducing valve, 35...Air supply means.

Claims (1)

[Claims] 1. To continuously apply a coating agent to a specific part or the entire part of the outer periphery of a long object whose cross section perpendicular to the longitudinal direction is constant while the long object is traveling in the longitudinal direction. In the device, the coating agent distribution chamber into which the coating agent is introduced is constituted by a flat recess formed in at least one of the base and the lid and perpendicular to the running direction of the long object, at the joint surface of the base and the lid. The coating agent distribution chamber is provided with a long object inlet and a long object outlet that allow a long object to run as if cutting out or penetrating the distribution chamber, and the shapes of the inlet and outlet are is a shape in which an appropriate clearance is provided to the coated part on the outer periphery of the cross-sectional shape of the long object, and the inner surface of the outlet of the long object has a uniform interval between the inner surface and the coating surface of the traveling long object. A plurality of protrusions extending in the running direction of the long object are provided which have the function of maintaining uniform coating thickness and uniform coating thickness, and a coating agent introduction means is connected to the coating agent distribution chamber. A coating device for long objects, which is characterized by: