JPH0346284B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] A green sheet forming method using a doctor blade method, in which a carrier film for green sheet forming has a multilayer structure, and when winding up the green sheet after forming, the upper layer carrier film is green. By peeling off the lower carrier film and winding it up separately, the tensile strength of the entire carrier film can be ensured during the green sheet forming process, and the green sheet can be easily handled and processed after forming. This will also be achieved by ensuring that

[Industrial application field]

The present invention relates to a method of forming a green sheet used, for example, in the production of a ceramic circuit board, and particularly relates to the structure of a carrier film and the procedure for winding up a green sheet in a forming method using a doctor blade method.

[Conventional technology]

In the green sheet forming method using the doctor blade method, as shown in FIG. A green sheet S of a predetermined thickness is formed on the upper surface of the film, dried in a drying section D to a semi-raw state, and then wound up into a roll at a winding section E.

As shown in FIG. 3, conventionally, the carrier film F is one piece (single layer structure). Also, the green sheet winding method is as shown in A.
There is a method in which the green sheet and the carrier film F are separated and wound separately, and a method in which they are wound together as shown in B, and these methods can be used depending on the handling and processing of the green sheet after forming. In the case of winding method A, since the green sheet is wound separately from the carrier film F, it is inconvenient to handle the green sheet after forming, but it has the advantage that it is easy to make holes. On the other hand, in the case of winding method B, since it is integrated with the carrier film F, it has the disadvantage that the carrier film gets in the way when drilling holes, etc. It has the advantage of being stable. In recent years, the automation of green sheet forming and subsequent processing has progressed, and for this reason, a method of winding together the carrier film F, which is easy to handle, is often used.

[Problem that the invention seeks to solve]

In the case of the above-mentioned method of winding the carrier film together, if the carrier film F is thick, it is difficult to drill holes, and therefore it is required to make the carrier film F as thin as possible.

On the other hand, in the green sheet forming method using the doctor blade method, a large tensile force is applied to the carrier film F by the tension roller R and the winding roller of the winding section E in order to form the green sheet S to a uniform thickness. Let it work. Therefore, if the carrier film F is thin, the tensile strength decreases, distortion occurs, and especially in the case of a wide film, wrinkles occur in the longitudinal direction, making it impossible to form the green sheet to a uniform thickness. There is. Therefore, it is required that the carrier film F be made as thick as possible.

The present invention is intended to meet these conflicting demands, that is, to ensure the tensile strength of the carrier film when winding the green sheet with a carrier film, and to ensure good handling and processability of the green sheet after forming. The purpose of this invention is to provide a green sheet forming method that can achieve both of the following.

[Means for solving problems]

In order to achieve the above object, the present invention provides a carrier film with a multilayer structure consisting of at least two layers, and when winding up a green sheet after molding, the upper carrier film on the green sheet side is wound together with the green sheet, and the lower layer The carrier film is peeled off from the upper carrier film and wound up separately.

[Effect]

The multilayer structure of the carrier film ensures sufficient tensile strength as a whole even if the multilayer film is thin, while the carrier film that is wound together with the green sheet can be made thinner, resulting in good handling after molding. and processability is ensured.

〔Example〕

Examples of the present invention will be described below.

FIG. 1 shows an embodiment of the method of the present invention, in which a carrier film F is composed of two layers, a thin upper film F1 and a thick lower film F2, and a green sheet S is formed on the upper film F1.

Then, when winding up the green sheet after molding, the upper layer film F1 is wound up together with the green sheet S, and the lower layer film F2 is rolled up together with the upper layer film F1.
Peel it off and roll it up separately.

During green sheet molding, the carrier film F exhibits a large tensile strength as a thick film in which the upper and lower films F1 and F2 are integrated, and can prevent distortion and wrinkles of the film.

On the other hand, since the green sheet S is wound together with the upper carrier film F1, it is easy to handle after molding, and the green sheet S is rolled up together with the upper carrier film F1.
Since it is thin, it can be easily drilled.

It is of course advantageous to make the lower carrier film F2 as thick as possible as a tensile strength member, and to make the upper carrier film F1 as thin as possible, but this may impair the workability of the upper carrier film F1. Film F1, F2 within the range
It is also possible to have the same thickness.

Furthermore, the separately wound lower layer film F2 can be reused, and costs can be reduced.

Next, in the above embodiment, the carrier film F has a two-layer structure, but it can also have a multi-layer structure of three or more layers. For example, not only one layer but two or more layers of the upper carrier film F1 are laminated, and at the time of winding, all of these upper carrier films are wound together with the green sheet. In this case, when multiple processing steps are performed after molding, one layer of the upper carrier film is removed for each step.
If the green sheets are peeled off one by one, the handling and processability of the green sheets can be maintained throughout the entire process. However, if there is a large number of upper layer films, there is a risk that workability, especially in the processing step immediately after molding, will be impaired, so it must be avoided to increase the number too much.

〔Effect of the invention〕

As described above, the method of the present invention has a carrier film with a multilayer structure, thereby ensuring a large tensile strength that can sufficiently withstand the tension during green sheet molding, and ensuring good handling and processing of the green sheet after molding. This has an excellent effect in that it is possible to achieve both of this and to ensure safety.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of the main parts of the green sheet forming method of the present invention, FIG. 2 is an explanatory view of the green sheet forming method using the doctor blade method, and FIG. 3 is an explanatory view of the conventional method. S... Green sheet, F... Carrier film, F1... Upper carrier film, F2... Lower carrier film, B... Blade, E... Winding section.

Claims (1)

[Claims] 1. In a green sheet forming method using a doctor blade method, the carrier film for forming the green sheet has a multilayer structure consisting of at least two layers, and when the green sheet is wound up after forming, the green sheet side is A green sheet forming method characterized in that an upper carrier film is rolled up together with a green sheet, and a lower carrier film is peeled off from the upper carrier film and rolled up separately. 2. A patent in which the thickness of the carrier film is such that the upper carrier film is as thin as possible, and the total thickness of the upper and lower layers is sufficient to withstand the carrier film tension during green sheet molding. A green sheet forming method according to claim 1.