JPH04106495U - Drying equipment for electronic component manufacturing - Google Patents

Abstract

(57) [Summary] [Purpose] A ceramic material plate coated with a paste for forming a resistive film, a circuit, etc. on its upper surface is placed on a wire-mesh-like transfer belt, and while being transferred by the transfer belt, The drying device for drying the paste is designed to prevent the generation of metal powder that can cause manufacturing defects when the transfer belt moves, and to heat the ceramic material plate from the bottom surface as well. prevent warping and cracking. [Structure] In a drying device 5 equipped with a wire-mesh-like transfer belt 1 and a drying oven 5 disposed along the transfer belt 1, the transfer belt 1 is moved as appropriate along the traveling direction of the transfer belt 1. It is supported by rotatable rollers 10 arranged at intervals.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is suitable for thermal heads, chip resistors, or hybrid ICs. Next, paste the resistive film, circuit, etc. on the top surface of the ceramic material plate and dry it. In manufacturing electronic parts that are formed by subsequent firing, Relating to a device for drying the paste applied to the upper surface of the ceramic material plate. It is something.

0002

[Conventional technology]

The manufacturing of thermal heads and chip resistors generally involves A chip resistor in which many ceramic insulating substrates are connected vertically and horizontally. A ceramic material plate is formed on the top surface of the ceramic material plate. Form vertical and horizontal lines to break the board for each insulating board, and Apply the paste to each location on the insulating board using screen printing, and then apply this paste. Resistive films, circuits, etc. are formed by drying and firing, and then the ceramic material is It is well known that the procedure is to break the board along the vertical and horizontal lines. It is as follows.

0003 Conventionally, when drying the paste applied to the ceramic material plate, As shown in FIG. 7, while in contact with the top surface of the stainless steel table 20, The drying oven 22 is moved along an endless wire mesh transfer belt 21 that moves in the direction of the drying oven 22. A belt-type drying device is used, in which a wire mesh transfer belt 21 is While moving at a constant speed, paste is applied to the upper surface of this transfer belt 21 in advance. Place multiple ceramic material plates A side by side and move them in this state. During the conveyance, the drying oven 22 Dry the paste (not shown) on the surface and once the paste is dry, transfer the The raw material is directly transferred to a firing furnace 23 via a route 21 for firing.

0004

[Problem that the idea aims to solve]

However, in this conventional drying device, the transfer belt 21 made of wire mesh is This transfer belt 21 moves while rubbing the top surface of the table 10. When the transfer belt 21 and table 20 are moved, the transfer belt 21 and the table 20 are scraped and fine metal powder is is generated, and this metal powder is thrown upward from the mesh of the transfer belt 21. In addition, the pieces that have fallen off from the ceramic material plate A are also transferred to the transfer belt 21. are splashed upward from the mesh of the ceramic material plate A. Adheres to the paste before or during drying, and metal powder or chips remain attached. By drying and baking the paste in There was a problem that occurred. In addition, since the lower surface of the transfer belt 21 made of wire mesh is in contact with the table 20, , the air heated by the drying oven 22 is mainly directed against the upper surface of the ceramic material plate A. In other words, the top surface of the ceramic material plate A is mainly heated. As a result, warping and cracking are likely to occur in the ceramic material plate A. This also causes defective electronic parts and takes a long time to dry. There was also the problem that the process took a long time, leading to an increase in the size of the device. This invention prevents the generation of metal powder, which causes defective products, and the warpage of ceramic material plates. We provide drying equipment that can reliably prevent cracks and shorten drying time. The purpose is to

[0005]

[Means to solve the problem]

In order to achieve this purpose, the present invention has developed a film for forming resistive films, circuits, etc. on the top surface. A ceramic material plate coated with paste is placed on the plate and transported in a fixed direction. A drying oven for drying the paste is installed along a wire mesh transfer belt. In the drying device, the wire mesh transfer belt is moved along the moving direction of the transfer belt. The structure is such that it is supported by rotatable rollers arranged at appropriate intervals.

[0006]

[Effect]

In this way, the wire mesh transfer belt is supported by rotatable rollers. As a result, the transfer belt and rollers do not rub against each other, and the paste is dried during the process. Metal powder may be generated during the process, and chips that have fallen off from the ceramic material plate may be recycled. This prevents metal powder from flying up to the top of the ceramic material plate. Also, it is possible to reliably reduce the occurrence of defective products caused by chipped pieces of ceramic material plates. become. In addition, by supporting the transfer belt made of wire mesh with rollers, the transfer belt A void is formed below the drying oven, and due to the existence of this void, the air heated by the drying oven The ceramic material gets into the lower part of the ceramic material plate through the mesh of the transfer belt. In other words, heat the ceramic material plate approximately equally from both the top and bottom surfaces. The ceramic material board can be heated almost evenly, preventing warping or cracking of the ceramic material board. It is possible to reliably reduce the occurrence of drying, and also shorten the time required to dry the paste. It will be possible.

[0007]

[Effect of the idea]

Therefore, according to the present invention, the paste applied on the top surface of the ceramic material plate is dried. This can greatly reduce the occurrence of defective products during the drying process. In addition, it can shorten the drying time of the paste, improving the drying efficiency. Another advantage is that the drying device can be made smaller.

[0008]

【Example】

Next, the embodiment of the present invention will be explained based on the drawings (Figs. 1 to 6). Reference numeral 1 indicates an end roller that is wound around a pair of front and rear drive rollers 3 that are pivotally supported on the machine frame 2. The transfer belt 1 is, for example, a strip-shaped metal plate, After carving a large number of cutting lines in the direction perpendicular to the It is made of a wire mesh such as a so-called lath plate formed by stretching it. Among the upper portions of the transfer belt 1, the front side along the transfer direction of the transfer belt 1 A drying oven 4 that is heated to approximately 125 to 150°C is installed in a nearby area. The drying oven 4 and the transfer belt 1 constitute a drying device 5. A temperature of about 810°C is applied to the area located in front of the drying device 5 along the transfer direction. A heating furnace 5 is provided, and the firing furnace 5 and the transfer belt 1 form a firing device 7. It consists of

[0009] Then, the transfer belt 1 is placed in a portion of the machine frame 2 that corresponds to the baking device 7. A table 8 is provided whose bottom surface is in direct contact with the A recess 2a is formed in a portion corresponding to the drying device 5 so that there is a space below the transfer belt 1. The recess 2a is provided with left and right holes extending along the left and right longitudinal side edges of the transfer belt 1. A pair of support rods 9 are arranged between the support rods 9 along the moving direction of the transfer belt 1. A large number of small diameter rollers 10 arranged at appropriate intervals are rotated via bearings 11. The transfer belt 1 is rotatably mounted, and the transfer belt 1 is supported by a large number of rollers 10. The bearing 11 is attached to the support rod 9 with a snap ring 12, Further, a tube 13 made of Teflon is fitted onto the outer peripheral surface of each roller 10. Further, the left and right support rods 9 have both ends 9a and 9b of the transfer belt 1. Only the proximal end 9a located on the front side in the transfer direction is screwed with an appropriate number of screws 14. A tip portion 9 fixed to the machine frame 2 and located forward in the direction of movement of the transfer belt 1 b is the free end.

0010 In the above configuration, a resistance is applied to the upper surface of the transfer belt 1 moving at a constant speed. A plurality of ceramic material plates A coated with paste to form a film etc. are sequentially As it is placed, during the transfer by the transfer belt 1, it is first placed in the drying oven 5. The paste applied to the top surface of each ceramic material plate A is dried using heat, and then By firing in the firing furnace 6, a resistive film, a circuit, etc. are formed on the ceramic material plate A. will be accomplished.

[0011] In this drying process, the transfer belt 1 is supported by rotatable rollers 10. Since the transfer belt 1 and the rollers 10 do not rub against each other, the transfer belt 1 No metal powder is generated during the movement of the ceramic material, and no metal powder is Prevents fallen chips from flying up again to the top of the ceramic material plate. Therefore, it is possible to reliably reduce the incidence of defective products caused by the generation of metal powder and chips. It is. Furthermore, by providing the roller 10, a void is formed below the transfer belt 1. , as shown by the arrow in FIG. It enters the lower part of the ceramic material plate A through the mesh, and the ceramic material plate A is placed on the upper surface. Since the ceramic material plate A can be heated almost equally from both the By reducing the occurrence of warping and cracking, it is possible to further reduce the incidence of defective products. The time required for drying the paste can also be shortened.

0012 In addition, even if metal powder or dust is generated after the drying process, it will not adhere to the paste. Therefore, in the baking device 7, the transfer belt 1 is placed on the table 8. There is no problem with direct contact.

[0013] As in the above embodiment, the left and right support rods 9 on which the rollers 10 are mounted are connected to the transfer belt 1. It is fixed to the machine frame 2 only at the base end 9a located on the front side in the direction of transfer. Then, the tip portion 9b located forward in the direction of movement of the transfer belt 1 is shaped into a free end. By doing so, the adverse effects of the expansion of the support rod 9 due to the heat of the drying oven 4 can be avoided. This can be prevented without impairing the smoothness of the movement. In other words, if only the base end 9a of the support rod 9 is fixed to the machine frame 2, the thermal expansion of the support rod 9 is not obstructed, and the support rod 9 remains linearly extended in its longitudinal direction. Since it thermally expands freely, no problem occurs even if the support rod 9 thermally expands. Furthermore, if only the tip end 9b of the support rod 9 is fixed to the machine frame 2, the transfer belt 1 causes a phenomenon in which the support rod 9 vibrates in a direction that intersects with its longitudinal direction. As a result, the transfer belt 1 also oscillates in the direction crossing the traveling direction. , if only the base end 9a of the support rod 9 is fixed to the machine frame 2, the support rod 9 will be Since the transport belt 1 does not vibrate in the direction that crosses the direction of travel, the There is no phenomenon of shaking in the direction in which the transfer belt 1 is inserted, and the transfer belt 1 can be moved smoothly. It is possible.

[0014] Note that the roller 10 is not attached to the support rod 9, but is mounted between the left and right machine frames 2. Needless to say, you can do as you like. The drying device in this invention is a line type or chip type thermal head or a chip type. ceramic resistors, chip capacitors, or hybrid ICs. By applying the paste to the top surface of the material plate, drying and baking it, the resistive film and dielectric film are formed. It is said that it can be applied to the manufacturing of general electronic parts that form electric bodies, circuits, etc. Not even.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of an embodiment of the present invention.

FIG. 2 is a plan view of the device.

FIG. 3 is an enlarged sectional view taken along III-III in FIG. 2;

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 2;

FIG. 5 is an enlarged sectional view taken along the line V-V in FIG. 2;

FIG. 6 is a partially enlarged view of FIG. 2;

FIG. 7 is a perspective view showing a prior art.

[Explanation of symbols]

1 Transfer belt 2 Machine frame 4 Drying oven 5 Drying device 6 Firing furnace 7 Baking equipment 9 Support rod 10 roller

──────────────────────────────────────────────── ─── Continued from the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location H05K 3/12 B 6736−4E // H01L 23/12

Claims (1)

[Scope of utility model registration request] Claim 1: A ceramic material plate on which a paste for forming a resistive film, a circuit, etc. is applied is placed, and the paste is conveyed along a wire mesh transfer belt configured to be transferred in a fixed direction. A drying device equipped with a drying oven for drying, characterized in that the wire mesh transfer belt is supported by rotatable rollers arranged at appropriate intervals along the moving direction of the transfer belt. Drying equipment for manufacturing electronic components.