JPH0454572B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a mold apparatus for coating a metal plate with a plurality of resin coating layers.

[Background technology] When covering a metal plate with multiple resin coating layers,
Usually, this is done by first forming a resin into a film using inflation molding or a T-die, and then welding this resin film to a metal plate using a heated roll. However, in this case, if the metal plate is coated with resin in this way, it will be disadvantageous in terms of manufacturing costs as it will take time and effort to make the resin into a film. A resin film that is larger than the board is used, which requires labor and labor for trimming the resin film and causes material loss.In addition, the resin film is completely molten. Since the metal plate is not coated with the metal plate, the adhesion to the metal plate is poor, and especially when multiple coating resins have different molding temperatures such as melting and softening temperatures, the adhesion between the coating resin layers may also be poor. Sexual problems will arise. Furthermore, when coating a resin film, the thickness of the resin coating layer is regulated by the thickness of the resin film, and there is also the problem that the thickness cannot be freely adjusted at the coating molding stage.

[Object of the Invention] The present invention has been made in view of the above points, and it is possible to coat resins having different molding temperatures with good adhesion without the need to make a film from the resin, and to make it possible to coat resins with good adhesion. The object of the present invention is to provide a mold apparatus for manufacturing a resin-coated metal plate that allows the thickness of the layer to be freely set.

[Disclosure of the Invention] The mold apparatus for manufacturing a resin-coated metal plate according to the present invention has a slit 2 through which the long metal plate 1 is continuously passed, and has slits 2 formed on both sides of the slit 2. A primary coating mold 5 having built-in resin supply channels 4, 4 for extruding the molten resin 3 into the slit 2 to apply a primary resin coating to both surfaces of the metal plate 1.
and a secondary coating mold 8 which is disposed closer to the primary coating mold 5 of the metal plate 1 than the primary coating mold 5 and has a built-in resin supply channel 7 for extruding the molten resin 6;
The opening portion of the resin supply channel 7 is rotated in sliding contact with the secondary coating mold 8 through a predetermined gap, and the molten resin 6 extruded from the resin supply channel 7 is transferred to the metal plate 1.
This mold apparatus is characterized by comprising a coating roll 10 for coating the surface of the primary resin coating layer 9, and an adjustment lip 17 for varying the cross-sectional area of the resin supply path 7. The above object is achieved by using the present invention, and the present invention will be explained in detail below with reference to Examples.

FIG. 1 shows an embodiment of the present invention, in which a primary coating mold 5 is formed by upper and lower molds 12 and 13, and a metal plate 1 is passed between the upper and lower molds 12 and 13. A slit 2 is formed for this purpose. Each mold 12, 13 has manifolds 14, 14 connected to an extrusion molding device, and slit-shaped resin supply passages 4, 4 guided from the manifolds 14, 14 are connected to the upper part of the slit 2. It has an opening in the lower part. For example, soft polyvinyl chloride is supplied as the molten resin 3 to the manifolds 14, 14, and each of the molds 12, 1
3 is heated to about 190℃. Further, the secondary coating mold 8 is formed with a built-in manifold 15 connected to an extrusion molding device.
A slit-shaped resin supply passage 7 guided by the resin supply passage 7 is opened at the front side thereof, and a concave surface 16 having an arcuate cross section is formed in this opening portion. In this secondary coating mold 8, an adjustment lip 17 is attached at the exit portion of the resin supply path 7.
By adjusting the vertical position of 7, the resin supply path 7
By adjusting the width of the slit, the amount of molten resin 6 extruded from the resin supply path 7 can be adjusted. The secondary coating mold 8 is a main mold 1 in which a manifold 15 and a resin supply path 7 are provided as shown in FIG.
8, and end plates 19, 19 that are attached to both ends of the main mold 18 and close the side end openings of the manifold 15 and the resin supply path 7, and one end plate 19 has an extrusion molding device. A joint 20 to be connected is attached. For example, methyl methacrylate resin is supplied to the manifold 15 as the molten resin 6, and the secondary coating mold 8 is heated to about 240°C. The coating roll 10 is rotationally driven by a geared motor or the like, and a part of its outer periphery is inserted into the concave surface 16 of the secondary coating mold 8, and there is a gap between the outer circumferential surface of the coating roll 10 and the concave surface 16. Gap 21 for resin passage
is formed. The applicator roll 10 is moved in a direction approaching and away from the secondary coating mold 8 (a in FIG. 1).
It is possible to adjust the movement slightly in the direction of the arrow), and by this adjustment, the thickness of the gap 21 can be adjusted. The coating roll 10 is used to collect molten resin 6 extruded from the resin supply path 7 of the secondary coating mold 8.
is methyl methacrylate resin, 240
It is heated to about ℃. Further, a receiving roll 22 is disposed below the application roll 10 so as to be rotated in synchronization with the application roll 10. The primary coating mold 5 is fixed on the base 23, and the secondary coating mold 8 and the rolls 10, 22 are fixed on the side plate 23.
It is supported by a trolley 25 and is movable on the base 23.

The metal plate 1 is coated with resin using the mold apparatus formed as described above. First, a long metal plate 1 such as a 0.8 mm thick steel plate is continuously coated with a primary coating mold 5. Pass it through slit 2. At this time, the slit 2 is formed in the primary coating mold 5.
Molten resin 3, 3 such as polyvinyl chloride is extruded from resin supply channels 4, 4 from above and below, and both upper and lower surfaces of metal plate 1 are coated with molten resin 3, 3.
The metal plate 1 coated with the primary resin coating layers 9, 9 using the molten resins 3, 3 is passed between the applicator roll 10 and the receiving roll 22, but at this time,
The molten resin 6 such as methyl methacrylate resin extruded from the resin supply path 7 of the secondary coating mold 8 passes through the gap 21 as the coating roll 10 rotates.
The coating is applied to the surface of the primary resin coating layer 9 of the metal plate 1 by the coating roll 10 which acts as a rolling lip die. After the secondary resin coating layer 26 is thus formed on the surface of the primary resin coating layer 9, a product is obtained through a cooling process. The resin-coated metal sheet thus obtained is used as a roofing board material, etc., where the metal sheet is rust-proofed by the polyvinyl chloride film and has improved weather resistance by the methyl methacrylate resin film.

In the above, since the resin is coated on the metal plate 1 in a molten state, the adhesion of the resin coating layer to the metal plate 1 is good, especially the adhesion between the primary and secondary resin coating layers 9 and 26. This means that it will be possible to improve the Furthermore, by adjusting the width of the slit 2 of the primary coating mold 5 and adjusting the thickness of the gap 21 between the concave surface 16 of the secondary coating mold 8 and the applicator roll 10, the molten resin 3, 6 By increasing or decreasing the amount of resin applied, the thickness of the resin coating on the metal plate 1 can be easily adjusted.

[Effects of the Invention] As described above, in the present invention, both the primary resin coating and the secondary resin coating can be performed without the need to form a resin film, and the primary resin coating can be applied while the primary coating is in a softened state. Since the secondary coating can be applied to the metal plate, the adhesion of the resin coating layer to the metal plate and the adhesion of the resin coating layers to each other can be improved.Moreover, the primary coating mold can be melted into the slit through which the metal plate passes. It is structurally simple because the resin is extruded and coated on both surfaces of the metal plate. The molten resin extruded from the resin supply path is applied to the surface of the primary resin coating layer of the metal plate by a coating roll that is rotated in sliding contact, thereby forming a secondary resin coating on the metal plate that has been coated with the primary resin. In addition, the thickness of the primary coating and secondary coating can be adjusted by adjusting the amount of resin extruded, but no matter what the thickness of both is,
In the secondary coating mold, the cross-sectional area of the resin supply path is variable using an adjustment lip, so the thickness of the resin coating layer can be easily adjusted, and the coating roll for the secondary coating can be adjusted easily. Therefore, since the total thickness can be regulated, the final thickness dimension can be determined accurately.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, and FIG. 2 is an exploded perspective view of a part of the same. 1 is a metal plate, 2 is a slit, 3 is a molten resin, 4
5 is a resin supply path, 5 is a primary coating mold, 6 is a molten resin, 7 is a resin supply path, 8 is a secondary coating mold, 9 is a primary resin coating layer, and 10 is a coating roll.

Claims (1)

[Claims] 1. A resin having a slit through which a long metal plate is continuously passed, and for extruding molten resin formed on both sides of the slit into the slit to apply a primary resin coating to both surfaces of the metal plate. A primary coating mold with a built-in supply channel, and a secondary coating with a built-in resin supply channel for pushing out molten resin, which is disposed closer to the primary coating mold on the side in the direction of movement of the metal plate than the primary coating mold. The mold and the opening of the resin supply channel are rotated in sliding contact with the secondary coating mold through a predetermined gap, and the molten resin extruded from this resin supply channel is applied to the surface of the primary resin coating layer of the metal plate. 1. A mold device for manufacturing a resin-coated metal sheet, comprising a coating roll for coating and an adjustment lip for varying the cross-sectional area of the resin supply path.