JPH0710376Y2 - Tubular label - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a cylindrical label attached to a glass bottle, a plastic bottle, or the like, and particularly, to separate a container and a label required for recycling a used recovery container. This enables easy collection.

[Conventional technology]

In general, a cylindrical label made of a plastic film or the like is attached to the surface of a container such as a glass bottle or a plastic bottle, which doubles as a protective film for the container and a display label for contents.

The tubular label is formed by cutting a film into a predetermined size and adhering or welding one end side and the other end side thereof as a joining margin.

A tubular label formed using a heat-shrinkable plastic film can be attached to a container by using the heat-shrinkage force of the film generated by a simple heat treatment such as blowing with hot air as a tightening force for the container surface.

Glass bottles, plastic bottles, etc. are often collected as empty bottles and reused after their contents are consumed. In this case, it is necessary to remove the old label adhering to the surface of the container and mount a new label again.

Also, when the collected bottles are crushed and reused as a melting raw material, if the plastic material types of the container and the label are different, they must be separated.

As a method for separating and removing the tubular label from the recovered bottle, a method of applying a knife to the tubular label and cutting the tubular shape by cutting over the entire length in the trunk length direction, or blowing hot air etc. The method of burning off the cylindrical label is carried out.

[Problems to be solved by the device]

However, the method of cutting and opening the tubular label using a blade is complicated because it moves along the surface shape (unevenness) of the container while holding the container in a predetermined direction and pressing the blade with a constant pressing force. Equipment is required, automation is difficult, and efficiency is low. Also, when the container is a glass bottle, the resin coating applied as a protective film on the bottle surface may be scratched by the blade, and when the container is a plastic bottle, the bottle itself causes tearing by the blade. There is a risk. On the other hand, the method by blowing hot air does not complicate the device and the operation is complicated as described above, but it is applied to plastic bottles because the bottle itself may be deformed or damaged due to the heat effect of hot air. I can't.

The present invention provides an improved tubular label that solves the above problems.

[Means for Solving the Problems]

The tubular label of the present invention is a tubular label made of a heat-shrinkable plastic film, which is placed on a container and mounted with a heat-shrinkable force as a tightening force for the container surface. Are bonded to each other via an adhesive layer soluble in hot water or a hot alkaline aqueous solution.

[Action]

The tubular label of the present invention is attached to the container by using the heat shrinkage force as a clamping force against the container surface, and the clamping force is not lost unless the film joining portion of the tubular label is separated, and the stable mounting state is maintained. .

When hot water or a hot alkaline aqueous solution is contacted with the tubular label of the container collected after use, the adhesive at the film joint part of the tubular label is dissolved and the film heat shrinks (shortening of the circumferential length of the tubular label. ) Occurs. The heat-shrinking force acts as a shearing stress for peeling the bonded portion of the film in a direction parallel to the bonding surface, and promotes peeling of the bonding surface.

Due to the dissolution of the adhesive at the film joint and the effect of superposition of shear stress due to the heat shrinkage of the film, when the adhesive surface of the film joint is peeled off, the label will not have a tubular shape, so it will not be used for containers that had it. Loss the fastening relationship and leaves the container surface as it is.

Hereinafter, the present invention will be described in detail.

The film of the tubular label of the present invention is a known one such as stretched polyvinyl chloride, polystyrene, polyester, etc.
Those having a shrinkage ratio of 70% are appropriately used.

An adhesive soluble in hot water or a hot alkaline aqueous solution is used as an adhesive for joining both ends of the heat-shrinkable film to form a tubular shape.

As the hot water-soluble adhesive, for example, one that is soluble in hot water at 50 ° C. or higher is used. When the container is a plastic bottle, it is preferable to avoid an excessively high temperature so that the bottle will not be deformed by the influence of hot water, and to use one that dissolves in hot water of about 50 to 70 ° C.

An adhesive that is soluble in a hot alkaline aqueous solution is an adhesive that does not dissolve in an alkaline aqueous solution at room temperature, but dissolves in a heated alkaline aqueous solution (such as a caustic soda aqueous solution).

When using an adhesive that is soluble in a hot alkaline aqueous solution, depending on the material of the target container, for example, a tubular label attached to a container such as a glass bottle or a polyester bottle that is easily attacked by a strong alkali is used to protect the container. It is advisable to use an adhesive that dissolves in a weak alkaline aqueous solution (for example, pH 7.5 to 10).

The joining method of both ends of the film for forming the tubular label of the present invention is, for example, as shown in FIG. 1, face both end edges (2a) and (2b) of the film (2), and spread the adhesive on both sides. The tape (5) having the layer (3) may be adhered, or both edge portions (2a) and (2b) of the film (2) may be overlapped with each other as shown in FIG. The tape (5) having the above (4) may be attached.

In the tubular label of the present invention, a film cut into a required size is wound into a tubular shape having a diameter slightly larger than that of the container, and both end edges are joined as shown in FIGS. As shown by the chain line in FIG. 4, the body (10) of the container (10)
It is attached to the container by covering it with a) and heat treatment such as blowing with hot air, or alternatively, the film (2) cut to the required size is wound around the body (10a) of the container and the both edges are cut. It is also possible to form a cylindrical label surrounding the body portion (10a) by joining and heat-treat it.

As described above, the tubular label attached to the container by using the heat shrinkage force of the film as the tightening force for the container surface is stable with the heat shrinkage force of the film as the tightening force unless the joint portion of the film is peeled off during the product distribution process. Do not lose the installed state. In the normal product distribution process, the product does not come into contact with hot water or hot alkaline aqueous solution, so unless the product comes into contact with hot water or hot alkaline aqueous solution during the distribution process, there is no abnormality or special condition. The tubular label maintains a stable mounted state on the container surface due to thermal contraction without causing peeling of the bonded portion of the film.

On the other hand, the removal treatment of the label of the empty container collected after use is performed by using hot water or a hot alkaline aqueous solution as the treatment liquid, and dipping it in the treatment liquid or passing it through the shower to obtain an adhesive agent for the joint portion of the cylindrical label. Is carried out by a simple processing operation for dissolving.

In the label removing process, thermal contraction of the tubular label occurs, so that separation of the joint portion is promoted. That is, the tubular label of the heat-shrinkable film does not exhaust the heat-shrinkability of the heat-shrinkable film when it is attached to the surface of the container by heat treatment. Since the heat shrinkage remains, the heat shrinkage of the tubular label occurs as a film heating effect of the treatment liquid. For example, in the process of removing a tubular label attached to a bottle with a diameter of 5 cm, it is possible to cause a thermal shrinkage of, for example, about 10% in the tubular label, and the tubular label has about 16 mm (π × 50 mm × 10
%) The shrinkage stress in the circumferential direction that tends to shorten the circumference is at the joint (the width of the joint is about 10 mm at the maximum).
And acts as a shear stress in a direction parallel to the adhesive surface.

Therefore, the bonding portion of the film, even if the adhesive does not completely dissolve and disappear, as the effect of the action of shrinkage stress of the film in the process of decreasing the adhesive force as the dissolution progresses,
The peeling of the adhesive surface is promoted.

That is, when the tubular label of the present invention is attached to a container, its heat shrinkage force is used as a tightening force for the container, and in the label separating process of the collection container, peeling of the joint portion for separating the label is performed. The heat contracting force is used as the promoting force.

When the joints at both ends of the tubular label are separated as shown in FIG. 5, the tubular label loses the engagement relationship with the container surface and is separated from the container surface as it is.
Collected individually.

[Effect of device]

The tubular label of the present invention can be removed from the container surface by a simple treatment such as dipping or spraying with hot water or a hot alkaline aqueous solution as the treatment liquid. Therefore, unlike conventional cylindrical labels that must be cut with a blade or burned with hot air, problems such as damage and deformation of the container in the removal process can be solved, and label removal work can be performed more efficiently. You can

Further, in the container recycling process, the container cleaning process using hot water or an alkaline aqueous solution is performed, so that label removal and cleaning process can be achieved at the same time in the same process, which also contributes to simplification of the container recycling process. .

[Brief description of drawings]

1 to 3 are partially cutaway perspective views showing a film joining example of the tubular label of the present invention, FIG. 4 is a perspective view illustrating a mounted state of the tubular label of the present invention, and FIG. 5 is a tube of the present invention. It is a perspective view which shows the peeling state of the joint part of a label. 1: Cylindrical label, 2: Film, 3: Adhesive layer.

Claims (1)

[Scope of utility model registration request] 1. A tubular label made of a heat-shrinkable plastic film, which is covered with a heat-shrinkable force as a tightening force for the container surface, wherein one end side and the other end side of the heat-shrinkable plastic film are: A cylindrical label, which is bonded via a layer of adhesive that is soluble in hot water or a hot alkaline aqueous solution.