JPH0966512A - Manufacture of green sheet for ceramic board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the occurrence of an elongating deformation at a green sheet without increasing in size an apparatus when a film is released from the sheet after a slurry liquid coating the upper surface of the film is heated and dried in a heating and drying chamber to the green sheet. SOLUTION: An air injection unit 16 for injecting the atmospheric air to the transferring direction of a green sheet 10 with respect to the sheet 10 is provided at the outlet side of a heating and drying chamber 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a green sheet which is a material of a ceramic substrate used for electronic parts such as a thermal print head.

[0002]

2. Description of the Related Art Generally, a ceramic substrate used for an electronic component such as a thermal print head is still a soft green sheet, and after a break groove is formed on one or both of its front surface and back surface, It is produced by firing at a high temperature.

Conventionally, in the production of the green sheet, while transferring a wide synthetic resin film in its longitudinal direction at an appropriate speed, a slurry liquid in which a raw material powder and an organic solvent are mixed is provided on the upper surface thereof. Application and spraying to a constant thickness, then, the slurry liquid on the upper surface of the film, in a heating drying chamber, by performing heat drying to evaporate the organic solvent in the slurry liquid, to form a wide green sheet, then , This green sheet,
After peeling from the film, a plurality of strip-shaped green sheets are cut along the longitudinal direction, and each of the strip-shaped green sheets is wound on a reel.

[0004]

However, the final temperature for heating and drying in the heating and drying chamber is about 110 ° C., and the green sheet after drying is heated and dried at a temperature close to this final temperature. By coming out of the chamber, the green sheet after drying is peeled off from the green sheet in a fairly warm and soft state. Not only does the dimensional accuracy decrease, but the entire green sheet is wavy and surface-distorted.

Therefore, the green sheet must be cooled sufficiently before the film is peeled by providing a considerable distance between the outlet of the heating and drying chamber and the peeling of the film. Therefore, there is a problem that the total length of the entire device is significantly increased. Further, in the conventional device, when each strip-shaped green sheet cut from a wide green sheet is wound on each reel, each reel is driven and rotated simultaneously by one tokdle motor. Therefore, since it is inevitable that the winding of each of the strip-shaped green sheets has strength and weakness due to a diameter difference, variation in stretch deformation occurs between the strip-shaped green sheets, and the thickness thereof is increased. Also, there is a problem that not only the dimensional accuracy of the width is lowered, but also the entire band-shaped green sheet is wavy and surface-strained.

The present invention has a technical object to provide an apparatus which solves these problems.

[0007]

In order to attain this technical object, "Claim 1" of the present invention states that "the slurry liquid is heated and dried along a transfer path of a film on which the slurry liquid is applied and sprayed. In a green sheet manufacturing apparatus comprising a heating / drying chamber for forming a green sheet and a means for peeling the film from the green sheet, atmospheric air is provided on the outlet side of the heating / drying chamber. An air ejection portion is provided for the green sheet so as to eject in the transfer direction of the green sheet. "

Further, "Claim 2" of the present invention includes "a heating and drying chamber for heating and drying the slurry liquid to form a green sheet along a transfer path of a film on which the slurry liquid is applied and sprayed. A means for peeling the film from the green sheet, a slitter for cutting the green sheet into a plurality of strip-shaped green sheets, and a take-up reel for each of the strip-shaped green sheets. In the green sheet manufacturing apparatus, each of the take-up reels is rotationally driven by a torque motor for each.

[0009]

[Advantageous Effects of the Invention] As described in "Claim 1", at the outlet side of the heating and drying chamber, there is provided an air ejecting portion for ejecting atmospheric air to the green sheet in the transfer direction of the green sheet. By providing the green sheet that has been heated and dried in the heating and drying chamber, it will be immediately cooled to a temperature close to room temperature by the atmospheric air ejected from the air ejection unit. The elongation deformation of the green sheet that occurs can be reliably reduced without increasing the distance from the heating and drying chamber to the peeling portion of the film, and the dimensional accuracy of the thickness of the green sheet can be significantly improved, and The wavy surface distortion can be significantly reduced.

In this case, since the atmospheric air is jetted toward the green sheet in the direction of transport of the green sheet, the contact length of the atmospheric air with respect to the green sheet is increased, and the air can be effectively cooled in a short distance. At the same time, it is possible to avoid damaging the surface of the green sheet due to the jet of atmospheric air. Moreover, the jetted atmospheric air flows into the heating and drying chamber and lowers the temperature in the heating and drying chamber. It has no adverse effect.

Further, as described in "Claim 2", the take-up reel for each strip-shaped green sheet cut from the wide green sheet is configured to be rotationally driven by the torque motor for each. The thickness and width of each strip-shaped green sheet can be reliably wound by winding each of the strip-shaped green sheets with a constant tokule and reliably winding the strip-shaped green sheets. The dimensional accuracy of can be greatly improved, and the wavy surface distortion of each strip green sheet can be significantly reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings of FIGS. In this figure, reference numeral 1 denotes a film made of synthetic resin such as polyester that is fed from a winding reel 2. The film 1 passes through a guide roller 8 and passes through the heating / drying chamber 3 at an appropriate speed and then passes through a guide roller 4. After that, the winding reel 5 is wound up.

A doctor pipe 6 and an enclosure frame type dam member 7 are disposed on a portion of the upper surface of the film 1 on the delivery reel 2 side, and the slurry liquid is introduced into the doctor pipe 6 inside the dam member 7. From the lower surface of the film 1 to the upper surface of the film 1 to form a slurry liquid 9 on the upper surface of the film 1 with a constant thickness, and the slurry liquid 9 is heated and dried in the heating and drying chamber 3 to obtain a wide width. On the other hand, the film 1 is applied to the wide green sheet 1 at the position of the guide roller 4.
After being peeled from 0, it is wound on the winding reel 5.

Reference numeral 11 denotes a slitter provided on the rear side of the guide roller 4 in the transport direction, and the slitter 11 allows a plurality of the wide green sheets 10 (four in this embodiment). Strip green sheet 10
A, 10b, 10c, 10d is cut. Next, each of the strip-shaped green sheets 10a, 10
b, 10c, 10d, a plurality of reels 12, 13, 1 in which the slitter 11 is arranged on the rear side in the transfer direction.
It is configured such that it is wound in sequence with Nos. 4 and 15.

On the outlet side of the heating and drying chamber 3,
An air jet box 16 is provided in which atmospheric air is blown by a fan (not shown), and a filter 17 for removing dust is provided in the air jet box 16, and a louver 18 of a slanted blade is provided below the filter 17. Is provided, the atmospheric air is ejected toward the green sheet 10 in the transfer direction of the green sheet 10.

Further, the strip-shaped green sheets 10a,
As shown in FIG. 3, the winding reels 12, 13, 14, 15 for the respective 10b, 10c, 10d are driven to rotate by belt transmission from the torque motors 19, 20, 21, 22 for the respective reels 12, 13, 14, 15. To configure. Green sheet 10 heated and dried in the heating and drying chamber 3
The film from the green sheet 10 is immediately cooled to a temperature close to room temperature by the atmospheric air ejected from the inclined vane type louver 18 of the air ejection box 16 at the place of exiting the heating / drying chamber 3. It is possible to reliably reduce the elongation deformation of the green sheet 10 that occurs during the peeling of No. 1 without increasing the distance from the heating / drying chamber 3 to the film peeling guide roller 4.

In this case, the atmospheric air is ejected from the air ejection box 16 to the green sheet 10 by the louver 18 of the inclined blade type.
By setting the transfer direction to 0, the contact length of the atmospheric air with respect to the green sheet 10 is increased, and the air can be effectively cooled in a short distance, and the surface of the green sheet 10 is damaged by the jet of atmospheric air. In addition, it is possible to prevent the jetted atmospheric air from flowing into the heating and drying chamber 3 and lowering the temperature in the heating and drying chamber 3.

Further, each strip-shaped green sheet 10a, 10b, 10c, 1 cut from the wide green sheet 10 is cut.
Take-up reels 12, 13, 14, 1 for each 0d
5 is configured to be rotationally driven by the belt transmission from the torque motors 19, 20, 21, 22 for each of them, as described above, so that each of the strip-shaped green sheets 10a, 10b, 10c, 10d is Since it is possible to wind the belt-shaped green sheets 10a, 10b, 10c, and 10d, it is possible to reliably prevent the winding of the belt-shaped green sheets 10a, 10b, 10c, and 10d from occurring.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is an enlarged plan view taken along line II-II of FIG.

3 is an enlarged plan sectional view taken along line III-III of FIG.

[Explanation of symbols]

1 film 2 reel 3 heating / drying chamber 4 stripping guide rail 5 take-up reel 6 doctor pipe 7 dam member 9 slurry liquid 10 green sheet 10a, 10b, 10c, 10d strip green sheet 11 slitter 12, 13, 14, 15 rolls Take-up reel 16 Air jet box 17 Filter 18 Louver 19, 20, 21, 22 Torque motor

Claims (2)

[Claims] 1. A heating / drying chamber for heating and drying the slurry liquid into a green sheet along a transfer path of the film having the slurry liquid applied on its upper surface, and a means for peeling the film from the green sheet. In the apparatus for manufacturing a green sheet having the above-mentioned arrangement, an air ejection unit is provided on the outlet side of the heating and drying chamber so as to eject atmospheric air in the transfer direction of the green sheet with respect to the green sheet. An apparatus for manufacturing a green sheet for a ceramic substrate, which is characterized in that 2. A heating / drying chamber for heating and drying the slurry liquid into a green sheet along a transfer path of the film on which the slurry liquid is applied and sprayed, and a film for peeling the film from the green sheet. A green sheet manufacturing apparatus comprising: a means, a slitter for cutting the green sheet into a plurality of strip-shaped green sheets, and a take-up reel for each of the strip-shaped green sheets. Is configured to be rotationally driven by a torque motor for each of them.