JPH0745105Y2 - Heat shrinkable label with foam ink - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a heat-shrinkable label with a foam ink, which is attached to a container to improve the heat insulating property and cushioning property of the container.

(Prior Art) Conventionally, as this kind of label, for example, Shoukai 58-26532
There are those listed in the Gazette.

In this conventional type, as shown in FIG. 6 (a), an unfoamed ink layer 3 containing unfoamed particles is applied on one surface of a heat-shrinkable label base film 1. . In the label, as shown in FIG. 2B, the base film 1 is formed by heating in a state of being formed into a tubular shape and fitted onto the container 6.
Can be contracted to be brought into close contact with the container 6, and at the same time, the unfoamed ink layer 3 can be foamed to provide the label with heat insulating properties and cushioning properties.

(Problems to be solved by the invention) However, in the above-mentioned conventional one, since the unfoamed ink layer 3 is simply provided on one surface of the substrate film 1,
In practical use, the following problems have occurred.

That is, generally, in this kind of label mounting operation, while the unfoamed ink layer 3 of the label is in direct contact with the outer surface of the container 6, the label 6 is heated from outside using hot air, etc. The inner surface side of the unfoamed ink layer 3 may not be sufficiently heated because heat is taken by the container 6. Therefore, even if the outer side of the unfoamed ink layer is foamed to some extent, the heat-foaming on the inner side close to the container is insufficient, resulting in excellent heat insulation,
It was difficult to exert the buffer property.

In particular, such a difficulty is more remarkable in the case where the container 6 is a cooled glass bottle, or in the case where the container 6 contains the contents at room temperature or lower.

Further, in order to sufficiently heat the inner surface side of the unfoamed ink layer 3 which is insufficiently heated, the heating temperature of the label must be set to a high temperature, but the heating temperature of the label depends on the degree of shrinkage of the base film, the inside of the container, the inside of the container. There are certain restrictions due to the material of the contents of
Labels cannot be indiscriminately heated to high temperatures. Even if it can be heated at a high temperature, in this case, the unfoamed particles contained in the unfoamed ink layer 3 are foamed and expanded more than necessary, and the gas inside the foamed capsule particles escapes to the outside. The foamed ink layer has a problem that the heat insulating function and the cushioning function are deteriorated, and the above problems cannot be appropriately solved.

Further, the phenomenon that the heat insulating and buffering functions are deteriorated due to overheating of the unfoamed ink layer 3 is a phenomenon which is often observed when the label is overheated at a high temperature in the conventional case such as boiling sterilization. Was also a conventional problem.

As a measure for solving the above-mentioned difficulties, it is conceivable to replace the unfoamed ink layer with a base film instead of the foamed layer containing expanded capsules. However, according to such means, the foamed layer that has been foamed in advance becomes extremely bulky, and therefore it is difficult to handle it during transportation, storage, installation on a labeling machine, etc., and the unfoamed ink layer is applied. Compared with the case, there is a drawback that it is not practical. Further, it is very difficult to apply the foamed layer thickly to the substrate film, and there is a problem in terms of the applying work.

Therefore, the present invention has good heat insulation and cushioning property as the foaming of the unfoamed ink layer can be appropriately performed without heating the heating temperature so high, and the unfoamed ink layer is heated too high. The purpose is to prevent the heat insulation function of the label from being significantly impaired even in the case of the above.

(Means for Solving the Problem) The present invention uses an unfoamed ink and a foamed ink in combination, without using a large amount of the foamed ink.
In addition, it was devised under a completely new idea of eliminating the improper cooling of unfoamed ink due to contact with containers.

That is, firstly, the present invention relates to a heat-shrinkable label in which an unfoamed ink layer 3 containing unfoamed particles that expand by heating is applied to one surface of a heat-shrinkable label substrate film 1. A heat-shrinkable label with a foamed ink, in which a foamed ink layer 4 containing a foamed hollow capsule is provided so as to be located closer to the label inner surface side than the unfoamed ink layer 3.

Secondly, the present invention is provided on one side of the heat-shrinkable base film 1,
A heat-shrinkable label with a foaming ink, in which a foaming ink layer 7 containing both unfoamed particles and foamed hollow capsules is provided.

(Function) In the first configuration, the foamed ink layer 4 provided inside the unfoamed ink layer 3 has a heat insulating function,
It exerts an effect of blocking and suppressing heat conduction from the unfoamed ink layer 3 to the side of containers to which labels are attached. Therefore, when the label is heated, the unfoamed ink layer 3 is not deprived of heat by the low-pitched container to which the label is to be attached, and the heat-foaming is not insufficient. Further, since the foamed ink layer 4 is located inside the unfoamed ink layer 3, there is no risk of hindering the heating of the unfoamed ink layer 3 from the outside. Therefore, it is possible to perform heat shrinkage of the label base film 1 and sufficient heat foaming of the unfoamed ink layer 3 without setting the label heating temperature to a temperature high enough to hinder the containers and the label base film 1. Becomes

Further, even if the unfoamed ink layer 3 is overheated and the gas in the unfoamed particles escapes to the outside to cause proper foaming of the relevant part, the foamed ink layer 4 existing separately from this. Therefore, the label as a whole has sufficient heat insulating property and shock absorbing property in order to exhibit heat insulating property and shock absorbing property. There is no significant reduction in heat insulation or buffer function due to overheating of the label.

Further, in the above-mentioned second configuration, in addition to the unfoamed particles, the foamed ink layer 7 provided on one surface of the base film 1
Since the foamed hollow capsules are contained, the hollow capsules suppress heat conduction from the foamed ink layer 7 to the containers. Therefore, similar to the first configuration,
The unfoamed particles in the foamed ink layer 7 can be appropriately heated and foamed. Even if the foamed ink layer 7 is unduly heated, even if the unfoamed particles cannot be properly foamed, the foamed hollow capsules previously contained in the foamed ink layer 7 have a certain heat insulation and cushioning property. Will guarantee the sex.

(Example) Hereinafter, the Example of this invention is described.

[First Embodiment] In FIG. 1, reference numeral 1 denotes a rectangular label substrate film made of a conventionally known heat-shrinkable material such as polypropylene. Reference numeral 2 denotes a printing layer on which a product name and other patterns are displayed, which is printed and coated on one surface (corresponding to the inner surface) of the base film 1 so that it can be seen from the outside of the transparent or semitransparent base film 1. Has been done.

Reference numeral 3 denotes an unfoamed ink layer applied on the surface of the printed layer 2, which is an unfoamed particle which is foamed by heating (for example, JP-A-56).
This is a so-called foamed ink containing microcapsules described in Japanese Patent Laid-Open No. 111663, which is printed by gravure, flexo, silk screen or the like.

Reference numeral 4 denotes a foamed ink layer provided on the surface of the unfoamed ink layer 3, and an ink containing already foamed hollow capsules (microcapsules) is superposed on the unfoamed ink layer 3 to form the unfoamed ink layer. It is applied by printing in the same manner as in No. 3.

Since the label 5 according to this embodiment has the above configuration,
First, in its use, a cylindrical shape in which the unfoamed ink layer 3 and the foamed ink layer 4 are located on the inner surface side of the base film 1 by connecting both ends of the label 5 to each other as shown in FIG. To form.

Next, in a state where the tubular label 5 is fitted onto the container 6 as shown by the chain double-dashed line in FIG. 2, hot air or steam is blown, sprayed, or heated by an electric heater to heat the base film 1. Heat contraction and foaming of the unfoamed ink layer 3 are performed.

Thus, the foamed ink layer 4 is provided inside the unfoamed ink layer 3.
Exists, and has the effect of blocking and suppressing the heat conduction between both the unfoamed ink layer 3 and the container 6, the unfoamed ink is not removed by the container 6 even if the container 6 is at a low temperature below room temperature. A large amount of heat of the layer 3 is not taken away. The unfoamed ink layer 3 can be efficiently heated, and the whole of the unfoamed ink layer 3 can be appropriately foamed under a relatively low heating temperature condition that is optimum for the heat shrinkage of the base film 1. Therefore, the entire label is attached to the container 6 in a tensioned state due to the heat shrinkage of the base film 1, and the unfoamed ink layer 3 is sufficiently foamed inside the base film 1 to provide excellent heat insulation and cushioning properties. It works.

In addition, when the label 5 formed in the cylindrical shape is externally fitted to a food container or the like that is sterilized by boiling, when the heat sterilization is excessively heated at a high temperature, an unfoamed ink layer is formed. Due to excessive foaming of the particles in 3 and the escape of gas inside, a situation occurs in which proper foaming is not performed. However, in the label 5, since the foamed ink layer 4 exists in addition to the unfoamed ink layer 3, the foamed ink layer 4 supplements the heat insulating property and the cushioning property of the entire label. The hollow capsule of the foamed ink layer 4 does not further foam and expand by heating, and maintains the initial state even when heated at high temperature. Therefore, the presence of the foamed ink layer 4 does not significantly impair the heat insulation and cushioning properties of the entire label due to overheating.

In the present invention, the thickness, ratio, etc. of the unfoamed ink layer 3 and the foamed ink layer 4 may be arbitrarily changed according to the application, and the specific numerical values are not limited at all.
Further, the ink layers 3 and 4 do not necessarily have to be provided on the entire surface of the base film 1, and may be provided, for example, in a stripe shape as shown in FIG. 3, or may be partially provided in other grid shapes, spot shapes, or the like. I don't care. Ink layer, if applicable
The inside of the container can be seen through by making the part where 3 and 4 are not provided transparent.

Further, the present invention is not necessarily limited to the means for sequentially providing the unfoamed ink layer 3 and the foamed ink layer 4 on the inner surface side of the label substrate film 1 as in the above embodiment.

For example, as shown in FIG.
When the unfoamed ink layer 3 is arranged on the outer surface side by contacting the foamed ink layer 3, the foamed ink layer 4 may be interposed between the unfoamed ink layer 3 and the base film 1. Further, as shown in FIG. 2B, the foamed ink layer 4 may be provided inside the base film 1. The point is that the foamed ink layer 4 may be provided so as to be located closer to the label inner surface side than the unfoamed ink layer 3. Here, the label inner surface side means that the foamed ink layer 4 is located inside the unfoamed ink layer 3 when the label is attached to a container or the like.

Further, the specific materials, components, etc. of the respective portions of the unfoamed ink layer 3 and the foamed ink layer 4 of the present invention are not limited to those in the above embodiment. The unfoamed ink layer 3 may contain unfoamed particles that expand by heating, and the foamed ink layer 4 may contain foamed hollow microcapsules. Specific types of unexpanded particles, hollow microcapsules, other specific ink components, coating methods, etc. are not limited.

Second Embodiment Next, a second embodiment of the present invention will be described.

In FIG. 5, reference numeral 7 denotes a foaming ink layer provided on one side of the heat-shrinkable base film 1 similar to that of the first embodiment, in which the foaming ink layer has unfoamed particles and foamed hollow capsules. And both are included. That is, in this embodiment, both the unexpanded particles and the expanded hollow capsules are not formed in separate ink layers as in the first embodiment, but are formed as a single expanded ink layer.

According to such a configuration, when the container 6 is externally fitted and heat-shrinked by forming it into a tubular shape as in the first embodiment, the foamed hollow capsules contained in the foamed ink layer 7 are A heat insulating function is exhibited, and heat conduction from the foamed ink layer 7 to the container 6 side is suppressed. Therefore, the efficiency of heating the foamed ink layer 7 is increased, and the unfoamed particles in the foamed ink layer 7 can be appropriately foamed at the optimum temperature for the heat shrinkage of the base film 1, and the foamed ink layer thus foamed. 7 has excellent heat insulating properties and cushioning properties.

It should be noted that it is the same as in the first embodiment except that the specific components of the unfoamed particles and the foamed hollow capsules contained in the foamed ink layer 7 and the coating method are not limited.
The ratio ratio is also not specifically specified. It can be arbitrarily changed according to the usage conditions.

[Other Examples]

In any case, the present invention is not limited to the specific type of the base film 1, and it is essential as long as it has heat shrinkability. Further, a specific shape such as whether or not it is formed in a tubular shape, and the presence or absence of a print layer for displaying a product name or the like are not limited. The print layer may be provided as needed. The printing layer may be provided on the outer surface side of the base film 1, but it is preferable to provide it on the inner side of the base film 1 because of the advantage that the printing layer can be protected.

In addition, in the present invention, all the specific configurations of the respective parts can be arbitrarily changed in design within the scope intended by the present invention, and the kind of the article to which the label is attached is not limited.

(Effect of the Invention) As described above, according to the means of separately providing a foamed ink layer having a heat insulating function containing a foamed hollow capsule inside the unfoamed ink layer of the present invention, The ink layer does not hinder the heating work for the unfoamed ink layer from the outside, and the foamed ink layer is deprived of heat from the unfoamed ink layer to the container side to which the label is attached when the label is heated. By properly preventing and suppressing such a problem, even when the label is attached to a low-pitched container as in the past, heating of the unfoamed ink layer does not become insufficient, heat shrinkage of the label base film and the container The unfoamed ink layer can be sufficiently foamed by a relatively low-pitched heating operation that does not hinder the performance of the products, and it has a special effect that excellent thermal insulation and cushioning functions can be provided.

Further, even when the unfoamed ink layer is overheated and proper foaming cannot be performed at the relevant portion, the heat insulation and cushioning function of the entire label may be significantly reduced by the conventional method. Instead, the foamed ink layer provided separately from the non-foamed ink layer supplements the heat insulating property and the buffer property of the label, and there is an effect that a considerable heat insulating property and buffer function can be secured as the entire label. Therefore, there is an advantage that it can be used properly even under a label mounting work condition in which heating at a relatively high temperature is unavoidable, such as a boiling sterilization work.

Further, according to the means of providing a foamed ink layer containing both unfoamed particles and foamed hollow capsules on one surface of the substrate film of the present invention, the foamed hollow capsules in the foamed ink layer have a heat insulating function. It is possible to prevent the heat of label heating from being deprived from the foamed ink layer to the container side, so that the other unfoamed particles in the foamed ink layer can be appropriately heated and foamed, and the foamed ink layer can be heated. Even if it is overfilled, the expanded hollow capsule still exerts a certain degree of heat insulation and cushioning function, and has the same special effect as the two-layer system of the expanded ink layer and the unexpanded ink layer described above. Is obtained.

In this way, the present invention has achieved a superior effect as compared with the conventional label of the non-foaming ink by using the non-foaming ink and the foamed ink in combination, and the non-foaming ink is completely eliminated. It is extremely practical without causing the bulk of the label to be inconvenient for its handling and production as in the case of providing only the foamed ink without using it.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention. FIG. 1 (a) is a perspective view, and FIG. 1 (b) is an enlarged sectional view taken along line XX of FIG. 1 (a). FIG. 2 is a sectional view showing a state in which the container is mounted. 3 and 4 (a) and (b) are sectional views showing other embodiments of the label. FIG. 5 is a sectional view showing a second embodiment of the present invention. 6 (a) and 6 (b) are sectional views showing a conventional example. 1 ... Label substrate film, 3 ... Unfoamed ink layer 4 ... Foamed ink layer

Claims (2)

[Scope of utility model registration request] 1. A heat-shrinkable label comprising a heat-shrinkable label base film 1 coated with an unfoamed ink layer 3 containing unfoamed particles that expand when heated. The foamed ink layer 4 containing hollow capsules,
A heat-shrinkable label with a foamed ink, which is provided so as to be positioned on the label inner surface side of the unfoamed ink layer 3. 2. A heat-foamable ink with a foamed ink, comprising a heat-shrinkable substrate film 1 provided on one side thereof with a foamed ink layer 7 containing both unfoamed particles and foamed hollow capsules. Shrinkable label.