JPS59136163A - Method and device for coating - Google Patents

Abstract

PURPOSE:To prevent generation of melt cutting and elongation of a base plate in the stage of conveying the base plate between a coater die and a conveying roll and sticking a viscous material thereon by displacing the gap width between the die and the roll according to the discharge pressure of the viscous material. CONSTITUTION:A loading pressure on a coater die 3 generated in the direction of a base material conveying roll 4 by means of springs 61, 62 is adjusted by adjusting bolts 13 and adjusing nuts 14 according to the mode of coating and thereafter a handle 4 is operated to slide the roll 4 in a forward and backward direction to adjust the gap width between the die 3 and the roll 4 according to the mode of coating. A base material 2 is passed between the die 3 and the roll 4, and a viscous material 7 is discharged from the discharging port at the tip of the die 3. The die 3 upon discharging floats against the loading pressure of the springs 61, 62 and moves vertically according to the fluctuation in the discharge pressure of the material 7 thereby coating uniformly the material under the prescribed discharging pressure. The material 2 is effectively cooled by the roll 4 from below whereby the melt cutting and elongation of the material 2 by the effect of the heat thereof are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating method and an apparatus thereof, and relates to a coating method and an apparatus thereof, which are applied, for example, to the production of true melt adhesive tapes used for disposable diapers and the like.

Conventionally, for example, real-melt adhesive tapes and the like convey a base material (film) between a fixed coater die and a base material (film) conveying roller that is also fixed and usually consists of a rubber roller. ) is manufactured by coating a viscous material (true melt adhesive) through the above-mentioned coater die, but in such a conventional method, the base material (film) tends to melt and break when conveyance is stopped or when conveyed at low speed. Also, when the coating thickness of the viscous hot melt adhesive increases during high-speed conveyance, the amount of heat increases, causing problems such as elongation of the base material (film).
In particular, fusing and elongation of such base materials (films) are likely to occur when coating a high temperature viscous material (hot melt adhesive) on a base material (film) with a low softening temperature.
This has been a major bottleneck in the production of true melt adhesive tapes.

The present invention provides a coating method that solves the above-mentioned problems, that is, a method of coating a viscous material on a substrate conveyed between a coke die and a substrate conveyance roller.
The present invention provides a coating method characterized by displacing the viscous material in the gap between the coater die and the conveyance roller by the discharge pressure of the viscous material from the coater die.

The present invention also provides a coating apparatus used for carrying out the above method, that is, a coating apparatus having a coater die and a substrate conveyance roller provided adjacent to the coke die, at least one of the coater die and the substrate conveyance roller. Provided is a coating device, characterized in that one of the rollers is supported via a spring, and the coater die or the substrate conveyance roller is displaced against the spring by the action of the discharge pressure of the viscous material from the coater die. It is.

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, embodiments of the apparatus of the present invention used for carrying out the method of the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic diagram of an embodiment of the coating apparatus of the present invention. In the figure, 1 is a base material unwinding roller, and the base material (film) unwound from the base material unwinding roller 1 is shown. ) 2 is transported between the coater die 3 and the base material transport roller 4, and is coated with a viscous material discharged from the discharge port at the tip of the coater die 3 during this transport,
There is no need for it to be wound up on a take-up roller 6 via a drive roller 5.

In the coating apparatus of the present invention, as shown in FIGS. 2 and 3, the coater die 3 is connected to the apparatus body work 1
It is supported via springs 61, 61, 62 and 62 so as to be able to move toward and away from the substrate conveyance roller 4, and also adjust the load pressure of the coater die 3 in the direction of the substrate conveyance roller 4 during coating. It is possible to do without. To explain the embodiment in more detail, the coater die 3 is fixed to a movable plate 31, and the movable plate 31 is fixed on the open side of the two U-shaped parts of the main body 11 of the apparatus by means of two guide bolts 12,12. The second spring 62 is supported so as to be displaceable in the downward direction and is biased from below by a first spring 61.61 fitted to the guide bolt, and also fitted to the guide bolt 12.12. .6
2 so that it is biased from above. Also, the downward displacement of the movable plate 31 is as follows:
The downward force exerted by the springs 62 and 62 of the writer 2 can be regulated by the adjustment pole (13.13) which is screwed into the guide pole (13.13) and comes into contact with the movable plate (31) from below. 14.14 Adjustment nut screwed into .12 and regulating the upper end of the second spring 62.62
It can be adjusted without or without. These adjustment ports 13.13 and adjustment nuts 1-14.14 adjust the balance between the urging force of the first spring 61.61 and the second spring 62.62 and the load of the coater die 3 and the movable plate 31. This adjusts the load pressure of the coater die 3 in the direction of the substrate conveyance roller 4 during coating.For example, by moving the adjustment pole 13.13 downward, the second spring 62.62 is attached. If the adjustment pole 13.13 is adjusted to a position where the force of the first spring 61.61 and the load of the coater die 3 and the movable plate 31 are balanced in a state where the force is O kg, the above load pressure can be set to O kg. , From this state, move and adjust the adjustment bolt 13.13 upward, and then adjust the adjustment screw)
．． 14 is adjusted downward, the adjustment bolt 13 prevents the downward movement while the movable plate 31 is urged downward.
．． 13, thereby increasing the load pressure.

Further, the substrate conveying roller 4 is constituted by a hollow roller made of metal, and there is no interior so that a cooling medium can flow therethrough. In FIG. 1, 41 is a coolant inflow pipe, and 42 is a coolant discharge pipe. Further, the substrate conveyance roller 4 is pivotally supported on a movable base 43 provided on the apparatus main body 11 so as to be slidable in the front and rear direction, and by adjusting the sliding position of the movable base 43 by operating a handle 44, As shown in FIG. 3, there is no gap between the coater die 3 and the base material conveying roller 4, which are provided at a slight angle, so that the state of fit can be adjusted. The substrate conveying roller 4 may be composed of a rubber roller with low thermal conductivity as long as it can be cooled with a low-temperature cooling medium, but the rubber roller should have a circularity and smoothness of 1 micron or less. Since it is difficult to perform coating with high precision and uniformity, it is preferable to use a metal roller that can avoid such difficulties. In addition, by using a metal roller as the substrate conveyance roller 4, it is easy to manufacture and has high thermal conductivity, so it is effective even when using a higher cooling medium than when using a rubber roller. The base material 2 can be cooled instantly.

Next, an embodiment of the method of the present invention carried out using an embodiment of the apparatus of the present invention having the above configuration will be described. In an embodiment of the method of the present invention, the coater die 3 and the base material conveying roller When coating the viscous material 7 on the base material 2 conveyed between the coater die 3 and the base material conveyance roller 4, the viscous material 7 is displaced in the gap between the coater die 3 and the substrate conveyance roller 4 by the discharge pressure of the viscous material 7 from the coater die 3. To be more specific, prior to coating the viscous material 7, the adjusted pols 13, 13 and the adjusted nands 14.
14 to adjust the load pressure of the coater die 3 in the direction of the substrate conveyance roller 4 due to the stripes 1J 61, 61, 62, 62 according to the coating mode, and then operate the handle 44 to adjust the base material conveyance roller 4 direction as described above. The material conveying roller 4 is slid in the front and back direction to connect the coater die 3 and the base material conveying roller 4.
Adjust the gap between the two according to the coating type.

Thereafter, the base material 2 is passed between the coater die 3 and the base material conveyance roller 4, and the viscous material 7 is discharged from the discharge port at the tip of the coater die 3. Due to this discharge, the coater die 3 floats against the load pressure by the springs 61, 61, 62, 62, moves up and down according to fluctuations in the discharge pressure of the viscous material 7 from the coater die 3, and reaches a predetermined discharge pressure. 7 is uniformly coated on the substrate 2. At the same time, the base material 2 is effectively cooled from below by the base material conveying roller 4. Therefore, for example, when a hot melt adhesive is used as the viscous material 7 and a J film is used to bind the base material 2, the base material 2 is effectively cooled from below. It is possible to prevent the material 2 from fusing or elongating due to heat. still,
When coating as described above, the coater die 3
Due to the discharge pressure of the viscous body 7 from the viscous body 7, normally a force in the direction of expansion is applied to the first spring 61.61, and a force in the direction of compression is applied to the second spring 62.62.

Although an embodiment of the coating apparatus of the present invention in which the coater die 3 is supported via a spring and an embodiment of the coating method of the present invention carried out using the embodiment have been described above, the coater die 3 of the present invention has been described. The coating device supports at least one of the coater die 3 and the substrate conveyance roller 4 via a spring, and the coater die 3 or the substrate conveyance roller 4 is supported by the spring by the discharge pressure of the viscous body 7 from the coater die 3. The coating method of the present invention can be carried out in the same manner as in the above embodiment by using the coating apparatus of the present invention configured in this manner. For example, in another embodiment of the coating apparatus of the present invention shown in FIGS. 4 and 5, on the contrary, the coater die 3 is fixed, while the substrate conveyance roller 4
is pivotally supported on a vertically movable movable plate 45 which is mounted on the movable table 43 via springs 45.45, and is provided with adjustment nuts 47.47 and adjustment bolts 48. as in the previous embodiment. 48, it is possible to adjust the circumference of the load pressure applied to the base material 2 by the springs 45, 45, and the pressure of the viscous material 7 discharged from the coater die 3 exerts a compressive force on the springs 45, 45, so that the coater die 3 and the substrate conveyance roller 4, the coating method of the present invention can be carried out in the same manner as in the previous embodiment using the coating apparatus of this embodiment.

Although the base material 2 and the viscous body 7 used in the present invention are not particularly limited, the present invention is suitable for producing a hot melt adhesive tape in which a hot melt adhesive is coated on a film.

According to the present invention, the gap between the coater die and the substrate conveying roller is displaced by the pressure of discharging a viscous material, such as a hot melt adhesive heated and melted, from the coater die during coating. With this structure, when coating a viscous material, desired cushioning properties can be obtained between the coater die and the substrate conveyance roller, and the discharge of the viscous material from the coater die can be adjusted to suit the viscosity of the viscous material. The pressure can be adjusted as desired, and the coating thickness can be adjusted extremely easily in microns.

Further, according to the present invention, as shown in the examples, a metal base material conveying roller that can obtain a core circularity and smoothness of 1 micron or less and has high thermal conductivity can be replaced with a conventional rubber base material conveying roller. Because it can be used in place of other materials, it is possible to perform highly accurate and highly uniform coatings by cooling metal rollers, etc., and prevents the base material (film) from elongating or fusing. As a result, effects such as being able to coat thin films or films with a low softening point with high temperature and high viscosity hot melt adhesives, which have been considered difficult in the past, can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the apparatus of the present invention, FIGS. 2 and 3 are front sectional views and side sectional views of the main parts, respectively, and FIGS. 4 and 5 are respectively the apparatus of the present invention. FIG. 6 is a front view and a side sectional view of main parts of another embodiment. 2...Base material 3...Coater die 4...Base material conveyance roller 7...Viscous body 61.62.45...Spring patent applicant Kao Soap Co., Ltd. Procedural Amendment 1988 3 February 28th, Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office■, Indication of the case, Patent Application No. 1982-9702, Title of the invention, Coating method and apparatus 3, Person making the amendment, Relationship with the case, Patent applicant (091) Hana Wang Soap Co., Ltd. 4, Agent: Pacific Nogizaka 601-6, 6-29 Akasaka, Minato-ku, Tokyo 6, Detailed explanation of the invention in the specification subject to the amendment, column 7, Contents of the amendment (1), page 11 Add the following with a line break between lines 12 and 13. [Also, the coating method of the present invention is not limited to the case where it is carried out using a coating apparatus using a spring as described above, and instead of using a spring, an air cylinder, a motor cylinder, a magnetic repulsion, a friction plate, or a weight may be used. Similarly, the above embodiments can also be achieved using a coating device in which the gap between the coater guide and the substrate conveyance roller is displaced by the discharge pressure of the viscous material from the coater die.

Claims (1)

[Claims] (11) In a method of coating a base material conveyed between a coater die and a base material transport roller with a viscous material, the discharge pressure of the viscous material from the coater die causes the gap between the coater die and the transport roller to be coated. (2) In a coating apparatus having a coater die and a substrate conveyance roller provided adjacent to the coater die, at least one of the coater die and the substrate conveyance roller is moved via a spring. A coating apparatus characterized in that the coater die or the substrate conveying roller is displaced against the spring by the action of the discharge pressure of the viscous material from the coater die. (3) The coater die is a first spring. and a second spring. When the discharge pressure of the viscous material from the coater die acts on the first spring, a force acts in the direction of expansion, and the second stripe 1 run receives the viscous material from the coater die. The coating apparatus according to claim (2), characterized in that when the discharge pressure of the body acts, a force acts in the direction of compression. (4) The substrate conveyance roller is supported via a spring, The coating apparatus according to claim (2), characterized in that when the discharge pressure of the viscous material from the coater die acts, a force acts on the spring in the direction of compression. (5) Inside of the substrate conveying roller Claim No. 2, characterized in that the cooling medium is not allowed to flow through the cooling medium.
Coating equipment described in ).