JPS6030043Y2 - Packaging materials that require conductivity - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a packaging material that is required to be electrically conductive.

Packaging materials such as returnable boxes or cases for integrated circuits I and C0 are required to be electrically conductive, but the current method is to mix conductive substances such as carbon into resin.
In-mold molding (injection molding) or vacuum molding of a plate (film) containing a conductive material is used.

However, in these materials, it is difficult to uniformly mix a conductive substance such as carbon mixed into the resin.

Therefore, there is a drawback that the electrical resistance value partially differs.

In addition, conductive materials such as carbon have a drawback that their electrical resistance value is inherently high (1 (F ohm)), making them unusable for MOS, I, C0, and the like.

These resins also have the disadvantage of being expensive.

In order to compensate for such drawbacks, the present applicant has previously proposed Utility Application No. 53-101406 (Utility Model Application No. 55-20221).
We devised a packaging material with the following structure.

That is, the invention of this prior application has a packaging material structure in which aluminum foil 2 of uniform thickness is laminated on both or one side of a vacuum-formable film 1.

The packaging material according to the invention of the earlier application has achieved its purpose in that the electrical resistance value is uniform over the entire surface of the packaging material, it is lightweight, and the required electrical conductivity has been obtained.

However, when forming a film made by laminating aluminum foil on both sides of a resin film using a vacuum forming machine, as proposed in the previous application,
Currently, many molding machines use radiant heat to soften the film, but as a characteristic of aluminum, the radiant heat absorption rate is only f5%, which has the disadvantage of poor workability and being economically expensive.

In the present invention, in order to absorb the radiant heat, printing 3 is applied to the surface of the aluminum foil 2 to increase the radiant heat absorption rate without impairing the conductivity of the aluminum foil 2.

Embodiments of the present invention illustrated in the drawings will be described below.

In the drawing, aluminum foil 2 of uniform thickness is laminated on both or one side of a vacuum-formable film 1, which is the same as the invention of the prior application.

Next, a print 3 capable of absorbing radiant heat is uniformly applied to the entire surface of the aluminum foil 2.

The shape of the printing 3 is uniformly applied to the surface in the form of a net as shown in FIG. 2, dots as shown in FIG. 3, or parallel lines.

Further, as the color of printing 3, a color with good heat absorption rate, such as black or red, is selected.

By performing the printing 3, the radiant heat absorption rate of the aluminum foil 2 is increased by about 50%, but it is necessary to limit the printing area to an extent that does not impair the conductivity of the aluminum foil.

In short, it is necessary to ensure conductivity by leaving a certain gap between unit patterns such as lines and circles.

Since the present invention has the above-described configuration, it is possible to obtain a packaging material that is both electrically conductive and has a high radiant heat absorption rate, and has effective effects in preserving the packaged items.

[Brief explanation of drawings]

FIG. 1 is a sectional view of two packaging materials of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a plan view of another embodiment. 1: film, 2: aluminum foil, 3: printing.

Claims (1)

[Claim for Utility Model Registration] In a packaging material in which aluminum foil 2 of uniform thickness is laminated on both sides or one side of a vacuum-formable film 1, the surface of the aluminum foil 2 is used to increase the radiant heat absorption rate and impair the conductivity. A packaging material that is required to be electrically conductive, characterized in that it has been printed uniformly over its entire surface to the extent that it does not.