JPH0112660B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to shrink labels for glass containers. This label serves as a decoration and advertising label as well as protecting the glass container.

Conventional technology Up until now, heat-shrinkable films formed into a cylindrical shape have been shrink-wrapped for glass bottles to prevent fragments from scattering when the bottles are broken, and predetermined characters, designs, etc. have been printed on the surface of the films. It is known that it can be printed and used as a label.

In particular, polyvinyl chloride stretched film has shrinkage characteristics,
Due to its excellent ductility, gloss, suitability for packaging machines, suitability for printing, etc., it has an established position as a material for use in shrinkable labels.

However, conventional heat-shrinkable films used to cover bottles are made from materials that are pre-formed into a cylindrical shape using an annular nozzle during manufacturing. It had to be printed on the surface of the bottle and then coated. However, if the printed surface is exposed to the surface, the printing becomes unclear due to contact with other objects, and printing directly on the surface of the bottle requires complicated operations, which reduces work efficiency. I can't escape it.

Furthermore, when these cylindrical heat-shrinkable films are applied to glass bottles, etc., support to the glass surface relies solely on the shrinkage force of the film, which has the disadvantage of causing misalignment. Moreover, since this film had almost no cushioning properties, it was hardly effective in preventing bottles from breaking.

Problems to be Solved by the Invention The present invention overcomes the drawbacks of conventional shrink wrapping covering materials, prevents the covering material from falling off or shifting during use, transportation, etc., and has cushioning properties against impact. The purpose of this invention is to provide a shrinkable label for glass containers with excellent quality.

Means for Solving the Problems The present inventors have conducted various studies to develop shrinkable labels for glass containers that do not fall off or shift in position and have good cushioning properties.
The inventors discovered that the objective could be achieved by combining a heat-shrinkable film and a specific foamable ink layer, and based on this knowledge, the present invention was accomplished.

That is, the present invention provides a shrink label for glass containers, which is comprised of a cylindrical body of a heat-shrinkable film printed on the inner surface, and a low-temperature heat-foamable foaming ink layer provided over the entire inner surface of the cylinder. be.

The heat-shrinkable film used in the present invention includes polyvinyl chloride, polyethylene, polypropylene,
It is a uniaxially or biaxially stretched film of polystyrene, polyvinylidene chloride, polyester, etc. The suitable temperature range for shrinkage is 80 to 140°C, such as 80 to 160°C.

There are no particular restrictions on the foamable ink as long as it is of the low-temperature heat-foaming type. For example, the foamable ink may be a microorganism made of thermoplastic resin particles impregnated with a low-boiling point liquid expanding agent, the surface of which is coated with a resin with low gas permeability. Containing capsules (U.S. Pat. No. 3,615,972,
JP-A No. 49-32966, JP-A No. 50-53111, JP-A No. 50-53111,
51-102191, 54-153869) or those containing chemical blowing agents (see JP-A-54-155266). Temperature range, e.g. 90
Those that foam at ~150°C, particularly 100-140°C, are preferred.

Such foamable inks are commercially available as, for example, "New Daiform (manufactured by Dainichiseika Kagyo Co., Ltd.),""Rioform G (manufactured by Toyo Ink Mfg. Co., Ltd.),""Rioform W (manufactured by Toyo Ink Manufacturing Co., Ltd.)," etc. .

To manufacture the shrinkable label for glass containers of the present invention, first, one side of a flat heat-shrinkable film is printed in the required manner, and then a foaming ink is applied over the entire surface, and the film is heated at 70°C or less. Dry at temperature.

In this way, it is possible to omit solid printing, which is required when creating normal labels.

Next, this film is cylindrically shaped with the foaming ink side facing inside, and the opposing edge pieces are butted against each other, and the edge pieces are adhered. This adhesion may be performed using a suitable adhesive or by heating and fusing the part.

The coating at this time can be performed by any known means such as a screen method, gravure roll method, summer dyeing roll method, roll coating method, or brush coating method.

FIG. 1 is a perspective view showing the structure of the thus obtained shrink label for glass containers before it is formed into a cylindrical shape, in which a printed surface 2 is formed on one surface of a heat-shrinkable film 1, and A low-temperature heating foaming type foaming ink layer is provided thereon.

The low-temperature heat-foaming type foamable ink layer does not need to be provided over the entire surface of the heat-shrinkable film, and may be partially missing in some cases. This has the advantage that when a transparent container is coated, the state inside the container can be observed from that location.

The shrink label for glass containers of the present invention can be applied to a predetermined container with a foam coating in the same manner as conventional shrink labels, either by hand or by an automatic shrink label machine. That is, by sealing a slit into a cylindrical shape to match the size of the container, attaching it to the container, and then heating it in the shrink process, the outer heat-shrinkable film adheres to the container, and then the inner The foamable ink layer foams to form a tightly packed layer between the film and the peripheral wall of the container. The heating conditions for this shrinking process vary depending on the size of the container, contents, film thickness, etc., but the temperature is 100-200℃ and the time is 3-200℃.
The range is 120 seconds.

FIG. 2 is a sectional view showing the state of the shrink label for glass containers attached to the container in this way.
The container wall 5 is covered with a film 1 having a seam 4, and a foaming ink layer 3 is inserted between the container wall 5 and the film 1, and the expansion pressure of the foamed particles and the contraction pressure of the film 1 are applied. Therefore, film 1 is wall 5
is strongly supported.

Effects of the Invention The label of the present invention has excellent cushioning properties, explosion-proof properties, heat retention properties, sealing properties, etc., and when using a film printed with characters, symbols, patterns, etc., it can bring about a beautiful decorative effect. It has the remarkable effect of being able to.

Next, the present invention will be explained in more detail with reference to Examples.

Example: The words "CI Kasei" were printed on a polyvinyl chloride shrink film ("BONSET SR" manufactured by CI Kasei Co., Ltd.), and the words "CI Kasei" were printed on the printed surface, and a foaming ink ("NEUDIFORM" manufactured by Dainichiseika Kagyo Co., Ltd.) was printed on the printed surface. '') was applied and dried at approximately 50°C for 10 minutes to produce a label-coating material.

Next, the coating material was sealed into a cylindrical shape and placed over a glass bottle with an outer diameter of 8 cm, and this was passed through a shrink tunnel (135°C, 60 seconds) equipped with a hot air heat source to create a tight seal between the film and the container wall. A foamed filling layer was formed.

The coating thus applied was so firmly attached to the glass bottle that it would not move at all even if an attempt was made to move it by hand. In addition, the printed characters were clearly observed, and it was confirmed that the printed characters could sufficiently function as a label.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a shrinkable label for glass containers according to the present invention, and FIG. 2 is a sectional view showing the shrink label attached to a container. In the figure, numeral 1 is a heat-shrinkable film, 2 is a printing surface, 3 is a low-temperature heating foaming type foaming ink layer, and 5 is a container wall.

Claims (1)

[Scope of Claims] 1. A shrinkable label for glass containers, comprising a cylindrical body of a heat-shrinkable film printed on the inner surface, and a low-temperature heat-foamable foaming ink layer provided over the entire inner surface of the cylinder. 2. The shrinkable label for glass containers according to claim 1, wherein the shrinkable film is a stretched polyvinyl chloride film.