JPH0243855Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an airtight sealing material used for forming discharge tubes and other airtight containers, and in particular facilitates the assembly work of airtight containers. The present invention relates to an airtight sealing material with good airtight sealing properties.

[Prior art] Conventionally, this kind of airtight sealing material has been made by adding a binder to heat-melting low melting point glass powder, etc., and processing it into a sheet or tape shape, or molding it into a predetermined shape. What has been done is known. When assembling an airtight container, the airtight sealing material is placed between the constituent members of the airtight container to be sealed, and is further heated and melted to seal the members together.

[Problems to be solved by the invention] However, when assembling an airtight container using the above-mentioned conventional airtight sealing material, the airtight sealing material is simply placed between the constituent members of the airtight container. Therefore, if an external force such as vibration is applied before the sealing is completed, misalignment will occur between the members or between the members and the hermetic sealing material.

In order to prevent this, it is possible to use a jig or adhesive to seal each member and airtight sealing material in a temporarily fixed state. In addition to the frequent work of attaching and detaching each member to the machine, equipment costs are required to create the jig.On the other hand, in the case of the method using adhesive, the work of applying the adhesive is complicated, and Depending on the type of adhesive, it may not completely evaporate during sealing, leaving a residue, which may cause leaks and reduce the airtightness of the airtight container.

This invention was devised in view of the above points,
It is possible to temporarily fix the airtight container to the constituent parts of the airtight container without using special jigs or applying adhesives that may cause residue, making it possible to assemble the airtight container at low cost and easily. The object of the present invention is to realize an airtight sealing material that can improve the airtightness of an airtight container.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a heat-meltable sealing base material with a heat-melting material on at least one side of which is decomposed and evaporated at a temperature below the melting temperature of the sealing base material. The present invention provides an airtight sealing material characterized by forming an adhesive layer that does not leave any residue.

[Function] With the above-described configuration, the airtight sealing material is temporarily fixed to the constituent members of the airtight container by the adhesive, so that the airtight sealing material is temporarily fixed to the constituent members of the airtight container or between the constituent members of the airtight container or between the member and the airtight sealing material. No misalignment occurs. Further, the adhesive material does not decompose or evaporate to produce a residue due to heating to melt the sealing base material, so that the airtightness of the airtight container is extremely good.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a cross-sectional view of an airtight sealing material according to an embodiment of the present invention. A bonding base material 2 is formed, and an adhesive layer 3 is further formed on one side of this sealing base material 2.
Note that 4 is a release paper attached to the adhesive layer 3.

The adhesive layer 3 may be any material as long as it decomposes and evaporates at a temperature below the melting temperature of the sealing base material 2, and various materials may be used depending on the melting temperature of the sealing base material 2. can. In the case of this embodiment, since the sealing base material 2 is mainly composed of low melting point glass with a melting temperature of about 350 to 400 degrees Celsius, the adhesive layer 3 is made of polymethacrylic acid having a decomposition evaporation temperature below this temperature. Preferably, those containing alkyl etc. as the main component,
In particular, when selecting a polyalkyl methacrylate having an alkyl chain length of 12 or less, such as polymethyl methacrylate, polyethyl methacrylate, or polybutyl methacrylate, an adhesive layer 3 having a decomposition/evaporation temperature of about 300°C can be obtained. It will be done.

In addition, the binder added to the sealing base material 2 may be decomposed at a temperature below the melting temperature of the base material 2.
Any material that evaporates is fine. In particular, if the material is selected from the same series as the material constituting the adhesive layer 3, that is, in the case of this example, polyalkyl methacrylate, the sealing base material 2 and the adhesive layer 3 will fit well. In addition, there is no possibility that products will be produced by the reaction of the decomposed gases generated from the sealing base material 2 and the adhesive layer 3, respectively. Therefore, this sealing base material 2
It is suitable to use this in an airtight container for a discharge tube in which there is a risk that the discharge characteristics will be deteriorated if impurities are present in the container.

In addition, in the above-mentioned example, the case where the adhesive layer 3 was formed only on one side of the sealing base material 2 was shown,
Depending on the application, it is also possible to form adhesive layers 3, 3' on both sides as shown in FIG. 2. In this case, release paper 4,
If 4' are bonded together, it becomes easy to store them in a rolled or laminated state and to perform post-processing such as punching. Furthermore, the shape of the airtight sealing material 1 is not limited to a sheet or tape shape, but can be formed into various shapes depending on the purpose, such as a ring shape as shown in FIG. 3, by the above-mentioned punching or forming process. It is also easy.

[Effects of the invention] As detailed above, the airtight sealing material of the present invention has an adhesive layer formed on the sealing base material, so when assembling an airtight container, the container components and the airtight sealing material can be easily bonded. is temporarily fixed. Therefore, there is no need to use a jig when temporarily fixing the container component and the airtight sealing material, and costs can be reduced.
Since there is no need to consider positional deviation, the assembly work becomes extremely easy. In addition, the adhesive layer has a decomposition/evaporation temperature lower than the melting temperature of the sealing base material, and does not completely decompose/evaporate and leave a residue when heated to melt the sealing base material. Therefore, extremely good airtight sealing performance can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention. Figure 1 is a cross-sectional view when an adhesive layer is formed on one side, and Figure 2 is a cross-sectional view when an adhesive layer is formed on both sides. The sectional view and FIG. 3 are perspective views showing examples of shapes. 1... Airtight sealing material, 2... Sealing base material, 3, 3'
...adhesive layer.

Claims (1)

[Scope of utility model registration request] At least one side of the sealing base material that has heat-melting property is decomposed and treated at a temperature below the melting temperature of the sealing base material.
An airtight sealing material characterized by forming an adhesive layer that does not evaporate and leave no residue.