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Drying method and coating film drying furnace for coating film formed on PET film surface

一种干燥方法、膜表面的技术，应用在对表面涂布液体的装置、预处理表面、干燥固体物料等方向，能够解决降低生产率、大量时间、降低层叠工序尺寸精度等问题，达到防止升温、防止扩散的效果

Inactive Publication Date: 2013-09-25
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this prior art method, the base film expanded by heating during drying shrinks in the cooling step after drying, thereby generating compressive stress in the coating film formed on the surface.
The coating film subjected to compressive stress will be deformed when peeled off from the base film, resulting in a problem that the dimensional accuracy of the lamination process will be reduced
In addition, if the drying temperature is lowered in order to avoid this problem, it will take a lot of time until the drying is completed, and the productivity will be reduced.

Method used

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  • Drying method and coating film drying furnace for coating film formed on PET film surface
  • Drying method and coating film drying furnace for coating film formed on PET film surface
  • Drying method and coating film drying furnace for coating film formed on PET film surface

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Embodiment approach 1）

[0029] figure 1 1 is a schematic enlarged cross-sectional view of a coating film, 1 is a PET film (polyethylene terephthalate film) as a base film, and 2 is a coating film formed on the surface. The coating film 2 of this embodiment is obtained by dispersing a solute such as barium titanate powder 3 which is a type of ceramic powder in an organic solvent together with an organic binder, and terpineol or the like is used as the organic solvent. In addition, it is a matter of course that the types of these ceramic powders or organic solvents etc. can be changed depending on the target product.

[0030] In general, water or organic solvents have an absorption spectrum of 3.5 μm or less, so they absorb infrared rays with a dominant wavelength of 3.5 μm or less and are heated and evaporated more efficiently, but PET resins are hardly affected by infrared rays with a dominant wavelength of 3.5 μm or less. The physical properties of the heating. In addition, in figure 1 In the sta...

Embodiment approach 2）

[0056] The present invention is not limited to the above-mentioned Embodiment 1, but can also be applied to a thick film type in which the thickness of the coating film is 100 μm to 2 mm. Embodiment 2 is explained below. The drying oven 10 used is the same as that of the first embodiment described above.

[0057] In embodiment 2, in figure 1 In the state before drying shown on the left, the thickness of the PET film 1 is 10-100 μm, and the thickness of the coating film 2 is 100 μm-2 mm.

[0058] When the coating film formed on the surface of the PET film has a film thickness of 100 μm or more, the temperature of the upper and lower surfaces of the coating film is not uniform during the drying process, and deformation caused by thermal stress is likely to occur. However, in this embodiment, first, only from The back side of the coated PET film is irradiated with infrared rays with a dominant wavelength of 3.5 μm or less, and then the coated PET film is irradiated with infrare...

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Abstract

The purpose of the invention is to provide a drying method and a coating film drying furnace for coating films formed on PET film surfaces, said method and furnace being capable of drying the coating film, which is formed on the surface of the base film and contains water or organic solvent, in a shorter time than in the past and without generating compressive stress in the dried thin film. On a PET film (1) on the surface of which a coating film containing water or an organic solvent that has an absorption spectrum at or below 3.5 [mu]m is formed, infrared rays with a dominant wavelength of 3.5 [mu]m or less are irradiated from an infrared heater (13). By bringing a cooling air into contact with the surface of the PET film on which the coating film is formed, the PET film is dried at a temperature lower than the PET film glass transition point. The infrared heater (13) has a structure such that the outer circumference of a filament (14) is covered with a protective tube (15) and a partition wall (23) for forming a flow channel (17) for a cooling fluid that limits the rise in heater surface temperature is provided in the space surrounding the protective tube.

Description

technical field [0001] The invention relates to a method for drying a coating film formed on the surface of a PET film and a coating film drying furnace. Background technique [0002] In the manufacturing process of electronic components with a multilayer structure such as MLCC (multilayer ceramic capacitor), chip inductor, and LTCC (low temperature co-fired ceramic), the following method is adopted: for example, as shown in Patent Document 1, forming A coating film comprising ceramic powder or metal powder, an organic binder, and an organic solvent is peeled and laminated from a base film while drying. An inexpensive PET film having excellent strength is widely used as the base film. [0003] In order to improve the productivity of this drying process, an infrared heater, warm air, etc. are generally used as a heating means. However, in this prior art method, the base film expanded by heating during drying shrinks in the cooling step after drying, thereby generating compr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D3/02B28B1/30
CPCB05D3/0263B05D3/0426B05D7/04F26B3/343B28B1/30C09D5/00
Inventor 藤田雄树近藤良夫青木道郎
Owner NGK INSULATORS LTD
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