JPS6078447A - Partial heating device of sheet material - Google Patents

Abstract

PURPOSE:To prevent defects of an image due to formation of sublimates by holding a frame body heating body at a temperature lower than the temperature of a heating body to heat both faces of a sheet material and holding the frame body heating body at a temperature higher than the heating temperature of the heating body when the sheet material is removed from a device. CONSTITUTION:A sheet material 1 is held between a frame body 2 and a holding body 4, and pressurized air is introduced to a pressurized air chamber 17 to bring closely the sheet material 1 into contact with a thin plate-shaped supporting body 3 and a heating body 5, and the sheet material 1 is heated through the thin plate-shaped supporting body 3 by the heating body 5. Simultaneously, power is supplied to a frame heating body 31 to control the frame body to a prescribed high temperature lower than the temperature of the heating body 5, and the sheet material 1 is heated from the side of the frame body 2. Then, sublimates from the sheet material 1 are prevented from sticking to recessed parts of the frame body to form needle-shaped crystal. When the sheet material 1 is removed, the frame heating body 31 is held at a temperature higher than the heating temperature of the heating body 5 to remove completely a minute amount of sublimates stuck to the frame heating body 31. Thus, defects of the image due to formation of sublimates are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a heat-activated, IM-exposed, and heat-developable type of normally non-photosensitive heat-developable original film sheet material as described in, for example, JP-A-52-73022.
For example, the sheet described in Japanese Patent Application Laid-Open No. 54-158231)
The sheet material is partially heated using a heating device 41.

<Prior art> In this conventional sheet material partial heating device, in addition to heating a portion of the sheet material, the material that is easily sublimated in the additive in the sensitive material layer coated on the sheet material is heated. is sublimated,
The sublimated substance adheres to the frame of the heating device and forms needle-shaped crystals. If the partial heating of the material is not repeated several times, the needle-like crystals grow and become large enough to deteriorate.

If these grown needle-like crystals fall onto the material being exposed, the needle-like crystals will change or block the optical path of image exposure, causing defects in the exposure. Furthermore, if it falls onto a sheet material that is being heated, since the sensitive material layer is softened during heating, it will appear as if the needle crystals have scratched the sensitive material layer, resulting in defects in the image. Ta. Further, the sheet material and the sheet material partial heating device are also used in microphotographs, and even if a defect caused by falling needle crystals is small, it becomes a large amount of light for a microphotograph.

Historically, partial heating of a sheet material using a conventional sheet material partial heating device is performed in one direction, only from the edge of the sheet material, or from the side where the sensitive material layer of the sheet material is coated, so it is often used in chemical laboratories. Compared to the photographic characteristics of the image formed by heating from both sides, which is performed by heating the sheet material for a certain period of time in silicone oil heated to the heating temperature of the swirling sheet material and stirred in an oil bath, There is a drawback in that the photographic properties of images formed with conventional sheet material partial heating devices deteriorate.

Even in the past, many efforts have been made to improve and solve these drawbacks. For example, studies have been carried out such as forming needle-shaped crystals, maintaining the temperature of the frame where growth occurs at a high temperature, coating the entrance surface with various materials, etc. However, none of these methods has shown decisive effects, and many of them conflict with important requirements such as uniform heating and digit arrangement in the image sheet material.

<Summary of the Invention> An object of the present invention is to provide a sheet material partial heating device that overcomes these drawbacks of the prior art.

According to this invention, a frame is used which surrounds the heating area and introduces pressurized air into the heating area, and the sheet material which is the object to be heated is placed between the frame and the frame. A thermally conductive thin plate-like support is arranged so that it can be sandwiched between the
The support body is held by a holder, and a heating body is removably disposed on the surface of the support body opposite to the foreboard sheet material,
In particular, a frame heating body is supported in the recess of the frame by a heat insulating material.

With this structure, when partially heating the sorting material, by heating the frame heating body and maintaining the measured temperature lower than the temperature of the heating element, the substance sublimated from the material can be heated. This suppresses the formation and growth of needle-shaped crystals that adhere to the frame recesses, and furthermore, when the notebook material is removed from the sheet material partial heating device, the trace amount that adheres to the frame recesses, that is, the frame heating element, is removed. In order to re-sublimate the sublimated material, the frame heating element is maintained at a high temperature higher than the temperature of the heating element that heats the sheet material for a certain period of time. In this way, image defects caused by needle-shaped crystals can be eliminated.

Historically, by heating a sheet material from both sides, the image characteristics are better than those formed by heating one side.

<Example> The description will be made below with reference to the drawings.

FIG. 1 (Example of sheet material partial heating device of the present invention)
FIG. A sorting material 1 as shown in the above-mentioned publication is held between a frame 2 and a thin plate-like support 3.

The thin plate-shaped support 3 is held by a cylindrical holder 4, and a 7JII heating element 5 is removably inserted into the cylindrical holder 4, and the heating element 5 is located on the side of the thin plate-shaped support 3 opposite to the sheet material 1. It is said that he was able to take care of his brother. The heating element 5 is 4'A as follows.
I'JA @reru. That is, a conductive heating element 8 is sandwiched between plate-shaped heat-resistant insulating plates 6 and 7 to form a planar heating element 9.
This planar heating element 9 is brought into contact with the inner surface of the thin plate-like support 3, that is, the surface opposite to the sheet material 1, via the plate-like heat equalizer 10.

The planar heating element 9 is held on a holder 12 via a cylindrical elastic body 11, and the upper surface of the heat equalizing plate 10 is configured to move in any direction relative to the holder 12. A temperature sensor 13 is arranged in contact with the central portion of the heat equalizing plate 10 and sandwiched between the planar heating element 9. The temperature sensor 13 and the conductive heating element 8 are each connected to a temperature controller (not shown) by a flexible heating element 14. The temperature is controlled to a certain predetermined temperature within a range.

The thin plate support 3 is made of a thermally conductive material and is held by the holding body 4 via the holding elastic body 16, and the frame body 2 and the holding body 4 have mating surfaces while holding the sheet material 1 between them. Even if the elevation of the thin plate support 3 is out of order, the holding elastic body 16
is made to coincide with the lower surface of the frame 2.

The frame body 2 surrounds the heating area of the sheet material 1, and pressurized air can be introduced into the pressurized air chamber 17 surrounded by the frame body 2 and the sheet material 1 through the inlet pipe 18.

A frame heating element 31 is supported on the wall surface of the recess of the frame 2 by a thermal bonding material 32. The frame heating element 31 is made by bonding a patterned four-electrode thin film heating element 34 on an insulating highly heat-resistant film 33. For example, a polyimide amide film (thickness 50 μm) is coated with nichrome kh. <Thickness 2
It is made of the trademark ``Samiconi Heater,'' which is made by layering 0μ) and forming a pattern using methods such as photomasks and etching. A temperature sensor 35 is disposed on the conductive thin film heating element 34, and the conductive thin film heating element 34 and the temperature sensor 35 are connected to each other by four flexible wires 36° 37 in a sequence 9]1] control (not shown). The circuit is connected to a temperature controller, and the heating element 1 is heated to a certain temperature, for example, 0 to 40 degrees Celsius lower than the temperature of the heating element 5.

When heating the sheet material 1, the sheet material 1 is held by the frame 2 and the holder 4 via the thin plate support 3,
The heating body 5 is introduced into the holding body 4, and pressurized air (not shown) is supplied to the pressurized air chamber 17 formed by the recess of the frame body 2 and the sheet material 1 through the air carrier 18. Pressurized air is introduced from the generation stage, the sheet material 1, the thin plate-like support 3, and the heating body 5 are brought into close contact with each other in order, and the sheet material 1 is heated by the heating body 5 through the drawing board-like support 3. At the same time, power is supplied to the frame heating body 31 and the frame heating body 31 is immediately heated.
The sheet material 1 is heated from the frame body 2 side by controlling the temperature to a predetermined temperature.

After heating for a predetermined period of time (3 to 6 seconds), the heating element 5 housed inside the holding body 4 is immediately removed to the outside, and at the same time, a = = w N force is applied to the frame heating element 31. The supply is cut off and the temperature If'(j' of the frame heating body 31 is lowered. The sheet 111g held between the frame body 2 and the thin plate-shaped support body 3
' 1 is the Gaussian dislocation point τ of sheet material 1! l? For example, when the base film of the sheet material 1 is made of polyethylene terephthalate, when the temperature drops to 90 to 100°C or less, the thin plate-shaped support 3 held by the holder 4 is released. Partial heating of the sheet material 1 is completed.

Furthermore, there are 4 moving machines for the sheet material 1 (not shown)! After performing partial heating at each location by shifting the position of the heated portion of the sheet material 1 using a By maintaining the temperature at 1 degree Celsius, it is also possible to completely remove a trace amount of sublimate deposited on the frame blade edge heating element 31.

<Effects> As mentioned above, this invention has the following effects when heating notebook material:
By keeping the frame heating body at a lower temperature than the heating body, the notebook material is heated both 1iIi and i1! !
It is possible to improve the characteristics of the J image. Historically, when the sheet material is removed from the sheet material partial heating device, defects in the image due to the formation and growth of sublimate can be prevented by maintaining the temperature at a higher temperature than the heating element during heating.

[Brief explanation of the drawing]

FIG. 1 is a side F side 1 showing a sheet material partial heating device 1j according to the above-described method. 1: 7-4, 2: Frame, 3: Thin plate support, 4: Holder, 5: Heating body, 9: Planar heating element, 10: Plate soaking O
=, 18: Air introduction officer, 31: Frame 7Jl] Atsushi, 32
: Insulating adhesive. Agent Saya Kusano

Claims (1)

[Claims] (1) a frame that surrounds a heating area and introduces pressurized air into the heating area; a frame heating body supported by a heat insulating material in a recess of the frame; a thermally conductive auxiliary plate-like support disposed so as to be able to sandwich a sheet material as a heated body between the frame body; a holder for holding the auxiliary plate-like support; A sheet material partial heating device comprising a heating element removably disposed on a surface of a thin plate-like support opposite to the sheet material.