JPH0341222B2 - - 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, a fixed coating device coats a predetermined portion of a rubber or plastic elongated article obtained by extrusion while the extrusion-molded rubber or plastic elongate is moved at a predetermined speed in the longitudinal direction. Conventionally, such a fixed coating device includes, for example, a coating agent supply pipe and a brush or scraper disposed adjacent to the pipe. As shown in the outline of the coating method in Fig. 1, the coating agent is continuously supplied from the tip of the coating agent supply pipe B while the long object A is traveling at a constant speed in its longitudinal direction, and then Regarding the running direction of the long object, the supply pipe B
The applied coating agent is stretched to a predetermined width and thickness by a brush C which is brought into contact with the elongated object A over a range corresponding to the application area in front of the elongated object A. However, with this type of coating method, it is extremely difficult to achieve complete spreading, and it is therefore difficult to form a coating layer with a uniform thickness over the entire coating width, resulting in coating that is thicker in the center and thinner in the periphery. A drug layer is easily formed. In addition, it is difficult to apply the coating agent neatly to the boundary line between the areas where it should be applied and the areas where it should not be applied (i.e., the parting line is not clearly visible, and there are areas where the coating agent is left uncoated or sticking out). occur). Such drawbacks are particularly noticeable when the viscosity of the coating agent is high. On the other hand, a spray coating method is sometimes applied to apply a coating agent to a long object. According to this method, the parting line clearly appears by masking, but this results in a lot of waste of coating material. In addition, with this method, when coating a long object with a highly uneven cross section, it is difficult to coat the entire coated surface with a uniform thickness.

An object of the present invention is to provide a novel coating device that improves the drawbacks of the conventional coating devices for long objects as described above.

According to the present invention, in order to achieve the above object, a first coating agent application means is attached to the tip of the first coating agent supply pipe, and the coating agent application means is adapted to apply the first coating agent. It has a first tube row consisting of a plurality of tubes each communicating with the supply pipe, and the tip openings of the tubes in the tube row are arranged in a row, while the second coating agent supply pipe has A second coating agent applicator is attached to the tip, and the coating agent applicator has a second tube row consisting of a plurality of tubes each communicating with the second coating agent supply pipe, The tip openings of the tubes in the tube row are arranged in a line, and the tip openings of the tubes in the first tube row and the tip openings of the tubes in the second tube row have a coating length. The tubes in the first tube row and the tubes in the second tube row are arranged alternately when viewed from the running direction of the long object, and the tubes in the first tube row and the tubes in the second tube row are all pressed diagonally against the long object to be coated with their tip openings. Provided is a coating device for a long object, characterized in that the arrangement of openings is flexible enough to follow the outer surface of the long object to be coated.

Hereinafter, the present invention will be explained in more detail based on the drawings.

FIG. 2 is a perspective view of the coating device of the present invention;
The figure is a sectional view thereof. In the apparatus of the present invention, a pump 2 is connected to each independent coating agent tank 1 and 1'.
Coating means 4 for applying a coating agent to a long object are respectively installed at the tips of independent coating agent supply pipes 3 and 3' for supplying coating agent by 2' and 2'.
and 4' are provided. The coating agent supply pipe 3 is the first coating agent supply pipe of the present invention,
The coating agent supply pipe 3' is the second coating agent supply pipe of the present invention, the coating means 4 is the first coating agent application means of the present invention, and the coating means 4'
This is the second coating agent application means of the present invention. The coating agent supply pipes 3 and 3' may be conventionally used pipes as long as they can flow the coating agent at a predetermined flow rate and have a predetermined strength. Of course, a material that is resistant to the coating agent should be used. The coating means 4 includes a coating agent reservoir 5 which communicates with the coating agent supply pipe 3;
It consists of a plurality of thin tubes 6 that can communicate with each other. The application means 4' likewise has a reservoir 5' and a tube 6'. The plurality of tubes 6 constitute a first tube row of the present invention, and the plurality of tubes 6' constitute a second tube row of the present invention. There are no particular restrictions on the internal volume, shape, etc. of the storage section 5, and it is provided to uniformly supply the coating agent introduced from the supply pipe 3 to all tubes 6, and this purpose is achieved. If so, the tip of the supply pipe 3 may be branched and the tube 6 may be connected directly. Storage part 5
is made of metal or plastic, for example, and has a certain strength and durability. The tube 6 is flexible and usually made of plastic or rubber. The tube 6 can have an appropriate size depending on the coating and coating thickness, but for example, an inner diameter of 1 m and an outer diameter of 1 m may be used.
It is a 1.5mm polyethylene tube. The tube 6 is made of a material that is resistant to the coating agent used. The tip openings of the plurality of tubes 6 are arranged in a line, and the arrangement shape corresponds to the application area in the cross-sectional shape of the elongated object. The same applies to the storage section 5' and the tube 6'. In this embodiment, the two application means 4 and 4' are fixedly connected to each other and supported by a support stand 7. 2 in the device of the present invention
The arrangement of the end openings of the tubes 6 and 6' belonging to the two application means 4 and 4' is as shown in FIG. 4 (FIG. 4 is a drawing of the application means seen from the direction of the tubes 6 and 6' ). That is, as can be seen from FIG. 3 and FIG. The tube end openings of the rows of tubes 6 are arranged alternately with the tube end openings of the rows of tubes 6'. Different tubes may be used for each row. In each row, the tubes may be in contact with each other at their outer surfaces, or their contact portions may be connected, or they may be spaced apart from each other as shown in the figure.

When using the coating device of the present invention as described above,
First, the elongated object A is made to run at a constant speed in its longitudinal direction, and the tip openings of the two rows of tubes 6 and 6' are lightly pressed against the coated surface of the elongated object A. At the same time, the coating agent is supplied from the coating agent tank 1 through the supply pipe 3 by the pump 2, passes through the reservoir 5, and is pushed out onto the coating surface from the tip opening of each tube 6, and from the coating agent tank 1' to the pump 2'. The coating agent is supplied through the supply pipe 3', passes through the reservoir 5', and is pushed out from the opening at the tip of each tube 6' onto the coating surface. Preferably, the tubes 6 and 6' are brought into oblique contact with the coating surface. According to the device of the invention, the coating agent is first applied to the coating surface of the long object using the tubes 6', and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the elongated object, and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the long object, and at this stage, the coating agent is applied to the coating surface of the long object. The coating agent is not applied to some areas, or even if it is applied, the thickness is small, but subsequently the coating agent is applied mainly to the middle area by the tubes 6 of other rows, so that the thickness is almost uniform as a whole. A coating agent layer can be formed. The spacing between the tube tip openings in each of the two tube tip opening rows in the apparatus of the present invention may be as long as it can produce such an effect, and specifically depends on the coating agent, tube diameter, coating conditions, etc. The decision shall be made accordingly. Even if there is slight non-uniformity in the thickness of the coating agent layer immediately after coating, the thickness will be averaged out by flow after a short period of time. In the case of FIG.
The arrangement of the tip openings was originally arranged in accordance with the shape of the application part in the cross-sectional shape of the long object (before it was applied to the long object A), but the arrangement of the tip openings was originally arranged according to the shape of the application part in the cross-sectional shape of the long object. It does not have to correspond exactly to the shape. The tubes 6 and 6' in the apparatus of the present invention have flexibility, so when the tip openings are pressed diagonally against the coating surface, they follow the shape of the coating surface and are arranged in a corresponding manner (i.e., the tubes 6 and 6' in the present invention are arranged in a corresponding manner to the shape of the coating surface). The degree of flexibility of 6' is such that it can produce such an effect).

FIG. 5 is a perspective view of a coating apparatus of the present invention used for coating the entire surface of a long article A having a circular cross-sectional shape, and FIG. 6 is a sectional view thereof. In this case, the coating agent reservoirs 5 and 5' are donut-shaped, and tubes 6 and 6' are connected to their inner surfaces, respectively, and the openings at their respective ends are arranged in a circular shape.

FIG. 7 is a perspective view of another specific example of the apparatus of the present invention, in which there is no storage section and a plurality of tubes 6 are directly connected to the coating agent supply pipe 3, and the pipes are similarly connected. A tube 6' is directly connected to 3'. In this way, if the coating agent is evenly supplied to each tube from the coating agent supply pipe, the storage section may be omitted. When such relatively long tubes are used, connecting and holding means 8 can be attached at predetermined locations in order to maintain the arrangement of the tip openings in each row.

According to the coating apparatus of the present invention as described above, the coating agent can be applied to a uniform thickness over the entire surface to be coated, and the parting line can also be clearly formed. Also, no coating agent is wasted. Furthermore, the long object is made to run along an appropriate guide,
Flare may occasionally occur. Even in that case, in the apparatus of the present invention, since the tubes 6 and 6' are flexible, they can sufficiently follow the coating surface and no uneven coating will occur. Further, according to the apparatus of the present invention, even a coating surface having a complicated cross-sectional shape can be easily coated with a uniform thickness. In the apparatus of the present invention, in particular, by charging different coating agents into two coating agent tanks, these can be mixed on the coating surface. That is, for example, by charging the main component of a two-component adhesive into one coating agent tank 1 and charging the hardening agent for the adhesive into the other coating agent tank 1', the adhesive can be coated on the coating surface. Only then are they mixed, and then curing begins. Therefore, compared to the case where the main agent and curing agent are mixed in advance and then applied, there is more time for adhesion work, and only the strictly necessary amount is used, eliminating the need for a special mixing container. There is no such thing as Further, for example, by charging paints of different colors into the paint tanks 1 and 1', it is possible to mix and match the colors on the surfaces to be coated, thereby creating a new color. Even in this case, only the strictly necessary amount is used, so there is no waste, and no special mixing container is required.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a conventional long object coating method, FIGS. 2, 5, and 7 are perspective views of a long object coating apparatus of the present invention, and FIG. 6 are sectional views of the apparatus of the present invention, and FIG. 4 is a drawing of the coating means seen from the tube direction. 1, 1': Coating agent tank, 2, 2': Pump,
3, 3': Coating agent supply pipe, 4, 4': Coating means, 5, 5': Coating agent storage section, 6, 6': Tube, 7: Support stand, 8: Connection holding means, A:
Long objects.

Claims (1)

[Scope of Claims] 1. A first coating agent application means is attached to the tip of the first coating agent supply pipe, and the coating agent application means includes a plurality of coating agent application means each communicating with the first coating agent supply pipe. The first tube row has a first tube row consisting of tubes, and the tip openings of the tubes in the tube row are arranged in a row, while the second coating agent supply pipe has a second coating agent at the tip. A coating means is attached, and the coating agent application means has a second tube row consisting of a plurality of tubes each communicating with the second coating agent supply pipe, and each tube in the tube row has a second tube row. The tip openings are arranged in a line, and the tip openings of each tube in the first tube row and the tip openings of each tube in the second tube row are aligned when viewed from the traveling direction of the long object to be coated. The tubes in the first tube row and the tubes in the second tube row are arranged such that the end openings of the tubes are pressed diagonally against the long object to be coated, so that the arrangement of the end openings becomes the same. A coating device for a long object, characterized in that it has flexibility so as to conform to the outer surface of the long object to be coated.