JPH0271870A - Coating head - Google Patents

Abstract

PURPOSE:To extremely facilitate assembly and decomposition by providing a pressing plate to both end parts in the lengthwise direction of two sheets of coater main body plates and providing a ready made packing plate between the pressing plate and the end faces of the coater main body plates and forming the part of the packing plate allowed to abut against at least a web into a specified shape. CONSTITUTION:A ready made packing plate 3 is allowed to abut against the end faces in the lengthwise direction of coater main body plates 1A, 1B and thereafter a pressing plate 2 is fitted to the packing plate 3 and fixed to the main body plates 1A, 1B by bolts 7, etc., to hold the packing plate. The edge face 3a in a web W side of the packing plate 3 is formed along the flow shape of the web W which is specified by the shape of the face 3a in the web W side of the main body plates 1A, 1B, namely the edge faces 1AE, 1BE in the part allowed to abut against at least the web W. In the extrusion type coating head obtained in such a way, leak of coating liquid in the side can be prevented and also assembly and decomposition thereof are made extremely easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an extrusion type coating head for applying a coating liquid of magnetic recording material or the like to a running web.

Further, this coating head can also be used for coating a photosensitive liquid on a photosensitive lithographic printing plate.

[Conventional technology]

In the production of magnetic recording media, applying a magnetic coating liquid to a support web using an extrusion type coating head was disclosed in Japanese Patent Laid-Open No. 6
2-241574 and the prior art cited therein.

In the prior art described in the above-mentioned publication, regulating plates are provided at both longitudinal ends of the slot between the coater body plates in order to solve the problem of non-uniform coating thickness in the width direction of the web seen in the prior art. It also teaches filling a space between the regulating plate and the side plate (pressing plate) with a filler such as resin or rubber.

[Problem to be solved by the invention]

I see, even if the coating thickness is made uniform in the width direction of the web by making the side surface next to the head of the regulating plate a sloped surface, the presence of the regulating plate will cause the coating liquid to flow over the regulating plate unless it is filled with filler. Since it wraps around in the direction, it is not possible to achieve uniform coating thickness and it is not possible to prevent the coating liquid from leaking. therefore,
Filling with filler is essential.

However, the fact that uniform coating thickness at the ends of the web in the width direction can only be ensured by ensuring that the upper surface of the filler is uniform in the width direction of the web and not undulating in the running direction of the web. In practice, it is extremely difficult to fill the filler with such precision under such conditions. Moreover,
This type of dispensing head requires frequent disassembly and reassembly, which means that once the cured resin is removed, heat must be applied to decompose it. Requires time and special processing.

SUMMARY OF THE INVENTION Accordingly, the main object of the present invention is to provide a coating head that can prevent the coating liquid from leaking from the side (web side) and is extremely easy to assemble and disassemble.

[Means to solve the problem]

The above problem was solved by providing pressers at both longitudinal ends of two coater main plates arranged in parallel with a slight gap to form a slot for injecting the coating liquid.
A ready-made packing plate is installed between this presser plate and the end face of the coater main body plate to close the longitudinal end of the slot, and at least the part of the edge surface of the packing plate that comes into contact with the web to be coated is attached to the coater main body. This problem can be solved by making the web of the plate follow the flow shape of the web defined by the shape of the surface.

[For production]

In the present invention, a regulating packing plate is disposed between the end surface of the coater main body plate and the holding plate to close the longitudinal ends of the slots. Therefore, when assembling, the coater body plates are overlapped while forming a slot, and the presser plate is fixed to the end surface of the coater body plate with the packing plate interposed, and when disassembling, the reverse operation is performed. Basically, no other man-hours are required for assembly and disassembly, and therefore it is extremely easy. In addition, at least the part of the edge surface of the packing plate to be coated on the web that contacts the web is made to follow the flow shape of the web defined by the shape of the web side surface of the coater main body plate. Liquid leakage from the sides of the coating head can be prevented without using any required fillers.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

The coating head according to the present invention includes two coater body plates LA,
The main elements are the IB, the holding plates 2, 2, and the punching plates 3.3 (only one of which is shown in the drawing) interposed therebetween.

The main body plates IA and IB are overlapped, and a half-moon-shaped recess is formed in the center of their mating surfaces in the height direction, thereby forming a pocket portion 4, and the upper part in the height direction is slightly thinner. This forms the slot 5. The upper surfaces of the main body plates IA and IB are shaped to be suitable for coating. Further, as shown in FIG. 6, a semicircular groove is formed in the height direction at the lower part of the longitudinal center of the main body plates IA, 1B, and a supply path 6 for the coating liquid is formed.

After the packing plate 3 is brought into contact with the longitudinal end surfaces of the main body plates IA and IB, the presser plate 2 is applied to the packing plate 3, and the main body plate IA is attached with bolts 7 or the like.

The packing plate 3 is held by being fixed to 1B.

On the other hand, the edge surface 3a (third and fourth
(see figure) is along the flow shape of the web W defined by the shape of the web W side surfaces of the main body plates IA, IB, that is, the edge surfaces IAt, IB1 (see FIG. 4). More specifically, when the web W has a certain flow shape, in the P range of the back jet IBM that defines the coating thickness,
The coating portion has the same shape as the edge surface IBE, and the lower surface of the flowing web W is shaped to prevent liquid from leaking to the side of the coater head in the Q area up to the end of the edge, the slot 5, and the liquid pool. Along the front edge L, in the R area excluding the terminal part of ○, the packing plate 3 is attached to the web W.
There is no need to contact the front edge IA in the R area.
Either match it to the shape of t or retract it further. As is clear from this explanation, as for the shape of the edge surface 3a, at least the portion (QR region) that contacts the web W is formed by the shape of the web W defined by the shapes of the edges IAI and IBE of the main body plates LA and IB. The surrounding shape of the packing plate 3 in other parts is arbitrary. Such a packing plate 3 prevents lateral leakage of the coating liquid from the Q to the R region, and conversely can also regulate the flow shape of the web W in the Q region, ensuring stable running of the web W. In addition, the coating thickness is defined in the P region, and furthermore, the use of the filler described in the above-mentioned publication is unnecessary.

The packing plate 3 is preferably formed of a wear-resistant resin such as a fluororesin such as "Teflon", but other general-purpose resins, rubber, etc. may also be used.

On the other hand, the coating liquid enters the pocket portion 5 from the supply path 6 at the center in the longitudinal direction of the main body plates IA, IB, passes through the slot 5, and is applied to the web W, but on both sides of the web W, As the problem is taught in the above-mentioned publication, the flow of the coating liquid stagnates at the longitudinal ends of the pocket portion 4 and the slot 5, and the coating liquid 4 degree increases or coagulates, resulting in the coating thickness becoming thinner than the web. It becomes thicker than the middle part of W, and when the coated web is wound up, only the edge part of the winding roll has a large diameter, which deteriorates the winding bag.

Therefore, as shown in FIGS. 5 and 6, a Deitzker 2A having an upward slope 2a from the bottom of the pocket 4 toward the outlet is formed at the position corresponding to the pocket 4 of the presser plate 2. preferable. Due to this presence in the Deitzkel 2, the coating liquid smoothly flows out from the slot 5 without stagnation, and prevents a high edge phenomenon after winding. The inclined surface may be a curved inclined surface 2a' shown in FIG. That is, the inclined surface 2 at allows the thickness of the applied film to be intentionally made thinner than the central portion. The shape may be 2AH,=20 fins or less, 2At1g=3011 or less, and 2AH3=3 cranes or less.

Further, in the above example, the date scale is formed on the presser plate 2, but it is also possible to form it integrally with the packing plate 3.

In the above example, presser plate 2 (including Deinkel 2A)
Although only one gasket 3 and gasket 3 are shown in the figure, they are also present at the other end in the longitudinal direction of the coater head. Further, the coater edge shapes shown in FIGS. 3 and 4 are merely examples.

Disassembly and reassembly can be carried out very easily by attaching and detaching the bolts 7, as described in the section of "Operation" above.

〔Effect of the invention〕

As described above, according to the present invention, the coater head is extremely easy to assemble and disassemble, and furthermore, there are advantages such as being able to prevent side leakage of the coating liquid without using a filler.

[Brief explanation of the drawing]

Fig. 1 is a side view of the coating head, Fig. 2 is a partial front view, Fig. 3 is a perspective view of the edge portion, Fig. 4 is a cross-sectional view thereof, and Fig. 5 is a side view of the coating head.
The figure is a perspective view of the presser plate, and FIG. 6 is a view taken along the line Vl-VI in FIG. 5. LA,,IB...Coater main board, IAE, IBE...
・Edge, 2...presser) anti, 2A...Deitskell,
3... Packing, 3a... Edge surface, 4... Pocket portion, 5... Slot, L... Coating liquid, W... Web. Figure 1 IJ 6 Figure 2 Figure Figure Figure Figure

Claims (1)

[Claims] (1) A presser plate is provided at each longitudinal end of two coater body plates arranged in parallel with a slight gap to form a slot for injecting the coating liquid, and the presser plate and the coater A ready-made packing plate is provided between the end face of the coater body plate to close the longitudinal end of the slot, and at least the portion of the edge surface of the packing plate that comes into contact with the web to be coated is covered with the web of the coater body plate. A coating head characterized in that it follows the flow shape of the web defined by the shape of the surface.