JPH0314351Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a backing sheet for press-through packs, and particularly to a backing sheet that makes printed characters easy to read from both sides.

[Conventional technology and its problems]

A press-through pack has a storage body with many pockets, and tablets and other items are stored in the pockets, and a backing sheet is glued to the outside of the pockets to seal them.When opening, the pockets must be opened from the outside of the bottom wall of the pocket. By pressing, the tablet inside breaks the backing sheet and the tablet is taken out.

Such a backing sheet usually consists of a base material of aluminum foil with a thickness of about 20 μm, glossy on one side and matte on the other, with a heat seal layer on one side and a printing layer and a resin coating layer on the other side. In order to create packaging that takes advantage of the characteristics of aluminum foil, it is attached to the container so that the shiny side faces the outer surface of the press-through pack. Therefore, when viewed from the outside of the backing sheet of the press-through pack, there has been a problem in that printed characters, figures, etc. are extremely difficult to read due to the high reflectivity of the glossy surface. In order to solve this problem, it is possible to provide a printing layer and a resin layer on the matte surface and use this as the outer surface, but in recent years, it has become common to print on the inner surface as well, and therefore the inner surface of the backing sheet A problem arises in that characters, figures, etc. become difficult to read when viewed from above.

[Purpose of invention]

The purpose of this invention is to solve the above-mentioned problems and provide a backing sheet that allows characters printed on aluminum foil to be clearly read from both sides.

[Means to achieve the purpose]

In order to achieve the above objective, in this invention, a printing layer and a heat-sealing layer were sequentially formed on the glossy surface of aluminum foil, and a filler with an average particle size of 10μ or less was mixed into this heat-sealing layer. .

[Effect]

In a press-through pack using a backing sheet constructed in this manner, the outer surface of the backing sheet of the pack is a matte surface of aluminum foil, making the printing easy to read and preventing misreading. Furthermore, the glossy surface of the backing sheet is made matte by the filler-containing heat-seal layer, and this heat-seal layer is sandwiched between the aluminum foil and the storage body, so that a water film is formed and the filler is removed. There is no fear that unevenness will be filled in, and even when the pack is viewed from the inner surface of the backing sheet, letters and other prints printed on the aluminum foil can be clearly read.

〔Example〕

Embodiments of this invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the backing sheet 10 includes a printed layer 12 on the glossy surface 11a of the aluminum foil 11,
A filler-containing heat-sealing layer 13 is sequentially formed, and a printing layer 12 is formed on the matte surface 11b of the aluminum foil 11.
and a resin coat layer 14. The printing layer 12 on the matte side and the resin coating layer 14 may be formed in the opposite order.

The aluminum foil 11 may be either hard or soft, but a hard aluminum foil with a thickness of 15 to 30 microns is desirable from the standpoint of protecting the contents and breaking through when taking them out. This is because if it is less than 15μ, pinholes are likely to form, and if it exceeds 30μ, the penetration property will be poor.

The heat-sealing agent used for the heat-sealing layer 13 is determined by the material of the storage body, and may be polyvinyl chloride-based such as vinyl chloride-vinyl acetate copolymer, polypropylene-based such as chlorinated polypropylene, modified polypropylene, etc. Ordinary glue is used. Examples of fillers to be mixed include silicon oxide, magnesium silicate, diatomaceous earth, titanium dioxide, zinc white, calcium carbonate, alumina white, and talc.

The average particle size of such fillers is less than 10μ, preferably from 0.5 to 8μ. When it is larger than 10μ,
The surface of the heat-sealing layer 13 becomes too rough, giving an undesirable rough feel. The blending amount is 0.5 to 70% by weight based on the resin content of the heat seal layer.
Preferably it is 1 to 20% by weight. This amount is
It is best to select it in relation to the average particle size. for example,
If the average particle size is relatively large, on the order of several μ, 0.5~
20% by weight. If it is less than 0.5%, the matting effect will not be sufficient, and if it exceeds 20%, the surface of the heat seal layer will become rough and rough, which is not preferable. If the average particle size is relatively small, the matting effect will be poor, so it is necessary to mix in a large amount, approximately 1 to 70% by weight.

Incidentally, when a filler is mixed into the heat-sealing layer, the adhesion property generally decreases, but if the particle size is small, the decrease is small, and in relation to the matting effect, a mixture of large and small particle sizes may be used. Furthermore, aluminum foil 11
An anchor coat layer can be provided between the heat seal layer 13 and the heat seal layer 13. When a transparent anchor coat layer is placed inside a heat-sealing layer that has been mixed with a filler to create a matte effect, it may appear glossy with a blackish tint.In this case, the adhesiveness of the anchor coat layer may be It is even better if a filler is mixed in to the extent that it does not interfere with the finish, to produce a somewhat matte effect, and to make the overall matte state.

Furthermore, this heat-sealing layer may be partially provided with gaps as necessary.

The resin coat layer 14 may be made mainly of resins such as nitrocellulose, acrylic, epoxy, or mixed resins thereof.

Further, a white pigment, a translucent pigment, an extender pigment, a colored pigment, etc. may be mixed into the heat seal layer or the resin coat layer.

FIG. 2 shows a press-through pack 1 in which tablets T are stored in the pockets 3 of the storage body 2 using the backing sheet 10 of this invention.

[Effect of idea]

By using the backing sheet of this invention, the outer surface of the backing sheet of the press-through pack can be made into a matte surface, making printed characters such as trademarks easy to read.
On the other hand, from the inner surface of the backing sheet of the pack, the glossy aluminum surface is visible through the housing and the filler-containing heat seal layer, so the gloss is erased and the printing is easy to read, making it extremely easy to read from both sides of the pack. It has the effect of becoming

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view showing an embodiment of the backing sheet of this invention, and FIG. 2 is a sectional view showing the structure of a press-through pack using the sheet shown in FIG. 10...Backing sheet, 11...Aluminum foil, 11a...Glossy surface of aluminum foil, 11b
... Matte surface of aluminum foil, 12 ... Printing layer, 13 ... Filler-containing heat-sealing layer, 14 ...
...Resin coat layer.

Claims (1)

[Scope of utility model registration request] A printing layer and a resin coating layer are sequentially formed on the matte side of the aluminum foil, which is glossy on one side and matte on the other side, and a printing layer and a heat sealing layer are sequentially formed on the glossy side. A backing sheet for a press-through pack that is characterized by being mixed.