JP2557440Y2 - Stretch label for container mounting and container with stretch label - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a stretch label suitable for use in a storage container for food or the like to be subjected to retort sterilization, and a container equipped with the stretch label.

(Prior Art) Conventionally, as this kind of stretch label, a polyethylene-based film having elasticity is used as a label base material.

In such a label, the work of simply stretching the label base material formed in a tubular shape and fitting it outside of the container is performed, and the elastic restoring force of the label base material is used without using an adhesive or heat shrinkage. To adhere to the container.

(Problems to be Solved by the Invention) However, the conventional stretch labels have the following problems in practical use.

2. Description of the Related Art In recent years, in the production and sale of foods in containers, for the purpose of prolonging the storage period, means for retort sterilizing the contents of the container from the outside of the container in a temperature range of, for example, about 90 ° C. to 120 ° C. are often used.

However, since the conventional stretch label is made of a polyethylene film as a base material, the softening is remarkable when heated to, for example, about 120 ° C., and the printed display of the label and the label itself cause a large distortion, and the self-stretch function is also provided. Such as being unable to maintain the proper state of attachment to the container,
This causes a phenomenon that the label is ineligible.

Therefore, there was a drawback that heat sterilization could not be performed with a conventional stretch label.

Heretofore, heat-shrinkable labels have also been developed as labels other than stretch labels. However, in the case of this heat-shrinkable label, when the label is heat-shrinked and attached to the container, and then sterilized and heated, the label may shrink again. Therefore, excessive shrinkage of the label causes a phenomenon that the container is unduly deformed, and cannot be applied to a container to be subjected to heat sterilization. Further, in order to suppress the deformation of the container due to the label shrinkage, the thickness of the container may be increased to improve the strength of the container. Difficult to adopt.

As described above, in the end, it is difficult to simply and beautifully attach and maintain the label to the body of the thermoplastic resin container which conventionally requires heat sterilization of the contents. Therefore, decoration or the like of a label on the body of this type of container must be performed after heat sterilization, which has become a very complicated operation for food manufacturers and the like.

Therefore, the present invention appropriately removes the inconvenience such that the label or the container is deformed erratically even when the sterilization heating is performed after the label is attached to the thermoplastic resin container, and the label is attached. It is an object of the present invention to keep a container in a beautiful appearance.

(Means for Solving the Problems) The present invention is intended to solve the above-mentioned conventional problems by making the stretch label unduly softened by sterilizing and heating the container as in the past, and not shrinking at a large shrinkage ratio. is there.

That is, first, the present invention includes a synthetic resin label base material 2 formed in a cylindrical shape, and has a diameter larger than an outer diameter of a mounting portion of a thermoplastic synthetic resin container. A container mounting stretch label having a self-extensibility so that it can be externally mounted on the outer periphery of the container by the elastic restoring force of the label base material 2 after the outer diameter is fitted onto the outer periphery of the container. The base material 2 has heat resistance to such an extent that deformation and loss of elastic restoring force do not occur at the heat sterilization treatment temperature of the contents inside the container, and does not deform the container by tightening the container at the heat sterilization treatment temperature. A container-equipped stretch label, which is a shrinkable film.

Secondly, the present invention is formed into a tubular shape around the trunk of a thermoplastic synthetic resin container body 4 in which contents to be subjected to a heat sterilization process are contained, and is attached to the container body 4 at the time of mounting. After the diameter is enlarged to be larger than the outer diameter of the mounting portion of the container main body 4 and fitted on the outer periphery of the container main body 4, the outer periphery of the container main body 4 is released by the elastic restoring force of the label base material 2. In a stretch label mounting container in which a stretch label 1 made of a synthetic resin label base material 2 having self-stretchability so as to be able to be fitted and fitted is fitted externally by its elastic restoring force, the label of the stretch label 1 is used. The base material 2 has heat resistance to such an extent that deformation and reduction of elastic restoring force do not occur at the heat sterilization treatment temperature of the contents inside the container, and non-heat that does not deform the container by tightening at the heat sterilization treatment temperature. Shrinkage It is a stretch label attaching container, which is a film.

(Operation) In the stretch label having the first configuration, the elastic label can be easily fitted onto the container body by utilizing the elastic restoring force of returning to the original diameter after the label base material 2 is expanded. When performing heat sterilization of the contents of the container, the label substrate 2
Even if is heated to a predetermined temperature, the label base material 2 is not unduly melted and softened, deformed unnaturally, or loses elastic restoring force. Therefore, the label substrate 2 can maintain a beautiful mounted state, and can reliably maintain the mounted state.

In addition, since the label substrate 2 is a non-heat-shrinkable film that is not deformed by tightening the container at the heat sterilization treatment temperature, a material having a small strength that is easily softened and deformed when heated, such as a thermoplastic synthetic resin container, Even if the container is made of a thick material, the risk of the container being unduly deformed under the influence of the shrinkage force of the label base material 2 is eliminated as much as possible.

The term “non-heat-shrinkable” used herein includes a slight heat shrinkage to such an extent that the container mounted at the temperature of the heat sterilization treatment is not deformed by tightening.

For example, the non-heat-shrinkable film includes a film which causes a slight heat shrinkage without affecting the container, that is, a film having a heat shrinkage of about 5% or less at the heat sterilization treatment temperature.

Further, in the stretch label-equipped container having the second configuration, even if the thermoplastic synthetic resin container main body 4 softens during heat sterilization and its strength is slightly reduced, the container main body 4 is not affected by the heat.
Since the stretch label 1 acting on the container is non-heat-shrinkable at the heat sterilization temperature, the container body 4 is not easily deformed. Therefore, it is not necessary to increase the thickness of the container body 4 to prevent deformation of the container body 4 to increase the container strength.

(Example) Hereinafter, an example of the present invention will be described.

In FIG. 1, reference numeral 1 denotes a stretch label formed by printing a trademark or other appropriate character pattern (not shown) on the surface side of a cylindrical label base material 2. The label base material 2 of the stretch label 1 has self-stretchability in the circumferential direction, and the material thereof is, for example, a polyurethane resin product having a trade name of "Esmer URS" of Nippon Matai Co., Ltd. You. The stretch label has a melting point of 180 ° C. and a shrinkage rate in the circumferential direction (direction of arrow A) at 120 ° C. of 1%.

The label base material 2 is formed in a tubular shape by attaching both end portions of a band-shaped resin film to each other, or cutting a long resin tube to a desired size. .

In the figure, reference numeral 3 denotes a container made of a thermoplastic synthetic resin for accommodating a food 5 or the like.
A polypropylene sheet heated to about 2.5 mm and softened by heating is formed into a bottomed cylindrical shape with an upper opening by vacuum forming or the like.

The stretch label 1 is externally fitted to the body of the container 3. The stretch label 1 is enlarged beyond the outer diameter of the container 3 by an appropriate expanding jig, and is externally fitted to the container 3. What is necessary is just to pull out the spreading jig from the label 1 and remove it. Thereby, as shown in FIG. 2, the stretch label 1 is attached and fixed to the body of the container 3 while being stretched by its own contraction force.

The stretch label 1 only needs to be attached to the container 3 with an elastic restoring force that does not fall off the container 3. Therefore, the container 3 is not unduly deformed by the elastic restoring force of the stretch label 1.

Next, in order to perform retort sterilization of the contents of the container with a label having the above configuration, these are heated at, for example, 120 ° C. for about 40 minutes.

Thus, since the stretch label 1 is made of a predetermined polyurethane resin whose label base material is excellent in heat resistance, the label 1 may be softened to cause unnatural distortion or lose its elastic restoring force. Never. The state of being attached to the outer surface of the container 3 is maintained with good appearance.

Further, the label 1 does not substantially shrink in the circumferential direction of the container 3 even by the sterilization heating (the shrinkage is a slight shrinkage of 1%). Is extremely small, and even if the strength of the polypropylene container 3 is slightly reduced by sterilization heating, the container body 4 does not deform.

In the above-described embodiment, the polyurethane resin was used as the label base material at 120 ° C. and the heat shrinkage rate in the circumferential direction was 1%. However, the specific material and shrinkage rate of the label according to the present invention were never changed. Not limited.

The temperature of the heat sterilization treatment varies depending on the object to be sterilized, but the point is that at a predetermined heat sterilization temperature at which the label base material 2 is applied, heat resistance is sufficient to stop the original state of the label base material and maintain the self-stretching property. Any non-heat-shrinkable film may be provided so as to prevent the container from being deformed due to heat shrinkage in the circumferential direction upon heating.

In this case, the non-heat-shrinkable film is a film having a heat shrinkage of 0% that does not shrink at all and the container 3 on which the label 1 is mounted is tightened and deformed by heat shrinkage of the label substrate 2 of the label 1. A film having only a slight heat shrinkage to the extent that it does not occur, for example, a film having a heat shrinkage of about 5% or less is also included.

The inventor of the present invention has conducted a number of experiments using various thermoplastic resin containers currently on the market as samples, and found that when the thermal shrinkage in the circumferential direction of the label was 5% or less, in any case. No gross deformation was observed. When the content exceeded 5%, some containers were deformed.

Further, as a specific material of the label base material 2, for example, polypropylene having a low draw ratio may be used as a material other than the above-described embodiment. The label substrate needs to have self-stretchability, but the specific elasticity is not limited.

However, when the label substrate 2 is a polyurethane resin, the label substrate 2 is excellent in elasticity and is particularly excellent in heat resistance, so that the label substrate 2 is softened to generate irregular distortion, Alternatively, the loss of the elasticity can be reliably prevented, the label and the container can be prevented from being deformed, and the state of being attached to the outer surface of the container 3 can be maintained in a better appearance.

Further, the specific configuration of the stretch label according to the present invention, such as printing applied to the surface thereof, can be freely changed in design. Further, the label may have both heat insulation and heat retention by applying foaming ink to the inner surface of the label base material 2 as necessary.

Further, the container with the stretch label according to the present invention also does not matter the specific shape and size of the container main body, and naturally does not matter the type of the specific contents.

In addition, the design of the present invention can be arbitrarily changed freely within the range intended by the present invention.

(Effects of the Invention) As described above, in the present invention, the self-stretchable label base material of the stretch label is deformed and the elastic restoring force is reduced at the temperature of the heat sterilization treatment of the contents inside the container to be loaded. Since it is a substantially non-heat-shrinkable film that has heat resistance that does not occur and does not deform the container at the heat sterilization treatment temperature by tightening, the self-stretching property of the label substrate is used. Of course, a simple outer fitting can be attached to the container body, even if the label substrate is heated to a predetermined temperature when performing heat sterilization of the contents of the container,
Unlike a conventional stretch label, the label does not unnecessarily deform or fall out of the container, and even when the strength of the container is low, the container may be deformed unnaturally due to the shrinking force of the label. It can be resolved.

As a result, in the present invention, a container that could not be sterilized by heating with a label attached to the body of the container body in the past, particularly a container having a small strength such as a thin-walled thermoplastic resin container was used. Even so, the decoration function, the advertising function, and the like can be obtained by attaching the stretch label, and a special effect of improving the product value and improving the service to the purchaser can be obtained.

Further, in the present invention, it is not necessary to increase the thickness of the container body for the purpose of preventing deformation of the thermoplastic resin container body caused by label shrinkage during heat sterilization, thereby making it possible to reduce the thickness of the entire container body. Another advantage is that resources can be saved during manufacturing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a stretch label and a container according to the present invention. FIG. 2 shows an example of a label mounted state, wherein FIG. 2A is a perspective view and FIG. 2B is a cross-sectional view. DESCRIPTION OF SYMBOLS 1 ... Stretch label, 2 ... Label base material 3 ... Container, 4 ... Container body

Claims (2)

(57) [Scope of request for utility model registration] The present invention comprises a synthetic resin-made label base material (2) formed in a cylindrical shape, and is expanded so as to have a diameter larger than an outer diameter of a mounting portion of a thermoplastic synthetic resin container. After being fitted on the outer periphery of the container, the elastic substrate of the label base material 2 has a self-stretching property so that the label base material 2 can be externally mounted on the outer periphery of the container. A non-heat-shrinkable film that has heat resistance such that deformation and loss of elastic restoring force do not occur at the heat sterilization temperature of the contents inside the container, and does not deform the container by tightening at the heat sterilization temperature. A stretch label for mounting on a container, characterized in that there is. 2. A container body formed of a thermoplastic synthetic resin, in which the contents to be subjected to a heat sterilization treatment are housed, is formed in a cylindrical shape on the outer periphery of a body portion thereof. After being enlarged so as to have a diameter larger than the outer diameter of the mounting portion of the container 4 and fitted on the outer periphery of the container body 4, the label base material 2
Label base 2 made of synthetic resin having self-stretchability so that it can be externally fitted to the outer periphery of the container body 4 by the elastic restoring force of
In a stretch label-equipped container in which a stretch label 1 made of a resin is externally fitted by its elastic restoring force, the label base material 2 of the stretch label 1 is deformed and elastic at the temperature of the heat sterilization treatment of the contents inside the container. A stretch label-equipped container, which is a non-heat-shrinkable film that has heat resistance to such an extent that a restoring force does not decrease and that is not deformed by tightening the container at the heat sterilization treatment temperature.