JPH0353876Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention has good metallic luster and is heat-shrinkable, and is mainly used for heat-shrinkable tubes for the bodies of shampoos, conditioners, cosmetics, dry batteries, etc. It is something.

[Conventional technology]

Conventionally, when shrink packaging the bodies of shampoos, conditioners, cosmetics, dry batteries, etc., in order to create a metallic luster to improve the appearance, the inner surface of the heat shrink tube is printed with silver ink, or A method is used in which metal vapor deposition is performed on the inner surface of a heat-shrinkable tube and the tube is shrunk at a low shrinkage rate (0 to 3%).

[Problem that the invention attempts to solve]

However, heat-shrinkable tubes whose inner surfaces are printed with silver ink do not have sufficient metallic luster, and heat-shrinkable tubes whose inner surfaces are coated with metal evaporation may have a heat shrinkage rate of 3% or more. There were problems with cracks appearing and the metallic luster completely disappearing. Also, low shrinkage rate (0~
3%), shampoo, conditioner, cosmetics,
There was a problem in that it became difficult to attach the heat shrink tube to the inner package such as a dry battery, and it was impossible to mechanize it.

[Means for solving problems]

In view of the above points, the present inventor conducted extensive research and found that by using a heat-shrinkable tube in which film a is partially adhered or temporarily attached to the inner surface of tube b, as shown in Fig. 1, by heat-shrinking the film. , Xiangpu;
The present invention was completed after discovering that it is possible to obtain shrink packaging that gives a beautiful luster due to metal vapor deposition for rinses, containers for cosmetics, dry batteries, etc., and that it also has good mechanical suitability.

Hereinafter, the present invention will be explained based on the drawings.

As shown in FIG. 1, the heat-shrinkable tube of the present invention has a film a partially adhered or temporarily attached to the inner surface of tube b. This is often crushed so that there is no interior space, and then supplied in a rolled state to a shrink packaging machine for various containers or dry cell batteries, etc.

As shown in FIG. 2, film a includes thermoplastic resin film 1, ink layer 12, ink layer 23, metal vapor deposition 4, ink layer 35, adhesive layer 6, and base material 7.
It becomes more.

As the thermoplastic resin film 1, ordinary thermoplastic resins can be used, such as polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, ethylene-acrylic acid copolymer, ethylene-methacrylic acid, ethylene-vinyl acetate copolymer, etc. Polymer, saponified ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer elastomer, styrene-butadiene-acrylonitrile copolymer, styrene-acrylonitrile copolymer, styrene-acrylonitrile copolymer, polyamide, polycarbonate, Thermoplastic resin films such as polysulfone, polyacetal, polymethyl methacrylate, polyphenylene oxide, polyurethane, polyethylene terephthalate, and polybutadiene terephthalate can be used, but the heat shrinkage rate of film a at 60°C to 120°C is Since it is 5% or less in both directions (preferably as low as possible), it is necessary to appropriately select a thermoplastic resin film commensurate with this.

The ink layer 12 and the ink layer 23 do not need to be two separate layers, and may be overlapped or not required. Further, it is not necessary to print completely solidly, but blank printing may be used. Furthermore, an ink layer 35 may be further provided between the four metal vapor deposited layers and the adhesive layer 6.

Further, the type of ink used can be any number of layers and may be selected as appropriate depending on the type of thermoplastic resin film 1.

The four metal vapor deposited layers may generally be any metal such as gold, silver, copper, aluminum, etc., but aluminum is generally used in many cases.

In addition to vapor deposition, thin film forming methods such as sputtering and ion plating may also be used.

Although the adhesive layer 6 and the base material 7 are not necessarily required, they may be provided in order to protect the metal-deposited surface.

A general adhesive can be used as the adhesive layer 6, and an appropriate adhesive can be selected.

The base material 7 is a thermoplastic resin film, cellophane paper,
Paper etc. can be used. The same thermoplastic resin film as in 1 can be used. However, since the thermal shrinkage rate of film a is 5% or less in both the vertical and horizontal directions (preferably as low as possible), it is necessary to appropriately select a base material commensurate with this.

Film a has a heat shrinkage rate of 5% or less, preferably 3% or less at 60°C to 120°C.
This is because the higher the thermal contraction rate, the more cracks will appear on the metal-deposited surface due to thermal contraction, causing whitening, and the lower the thermal contraction rate, the less whitening will occur.

The tube b may be any thermoplastic resin film having a heat shrinkage rate of 5% or more in the transverse direction at 60 DEG C. to 120 DEG C., and may be appropriately selected from commonly used shrink films. However, the smaller the heat shrinkability in the vertical direction, the better, preferably 8% or less.

The method of adhering or temporarily attaching the film A and the tube B may be by adhering them in a band shape as shown in Fig. 1, or by adhering them in spots as shown in Fig. 3 a. good. Alternatively, as shown in FIG. 3b, the entire surface may be temporarily attached so that the film a and the tube b can slip smoothly during heat shrinkage. Further, in order to provide such slipperiness, an oil layer, a Teflon-based lubricant layer, a silicone-based lubricant layer, or the like may be provided between the film a and the tube b.

Further, the tube b may be made of a film made into a cylinder as shown in FIG.

[Effect]

In the heat-shrinkable tube of this invention, since film a has a lower heat shrinkage rate than tube b, the metal deposited on film a does not whiten even after shrinking and maintains its brightness, and the shrinkage rate of tube b is Since it is sufficient, attachment to the inner package is also extremely good.

〔Example〕

Next, the present invention will be explained in more detail by giving concrete examples.

Example 1 Biaxially stretched polyester film 8 as shown in FIG.
Yellow ink 9 and gold red ink 10 (both Lamic F220 manufactured by Dainichiseika Chemical Co., Ltd.) were printed on (25μ thick, Lumirror manufactured by Toray Industries), and an aluminum vapor deposition layer 11 was further provided on the entire surface with a thickness of 500 Å to form film a.

In addition, a vinyl chloride film (70μ thick, Hishilex 502 manufactured by Mitsubishi Plastics) is used as the tube b and sealed with a seal 12 using a high frequency sealing method.

Film a and tube b are spot-bonded using a urethane adhesive.

Film a had a width of 100 mm, and tube b had an inner circumference of 170 mm.

When this heat-shrinkable tube was inserted into a shampoo container with an outer circumference of 160 mm and heated at 120° C. for 1 minute to cause the tube to shrink, the tube was sufficiently shrunk.

In addition, the luminance of film a (measured at a 60° gloss meter angle on a Suga test machine) was 550 before shrinkage, but
The luminance of film a seen from above tube b after shrinkage is 520, with almost no decrease in luminance.
It had a very good appearance.

[Effect of idea]

As explained above, by heat-shrinking the heat-shrinkable tube of this invention into containers for shampoos, conditioners, cosmetics, dry batteries, etc., it is possible to obtain shrink packaging that exhibits the beautiful luster of metal vapor deposition, and has good mechanical suitability. There is an effect that

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a heat shrinkable tube showing an embodiment of the present invention, Fig. 2 is a configuration diagram of film a, and Fig. 3 is a perspective view of a heat shrinkable tube showing an embodiment of the present invention.
Figures a and b are perspective views showing other embodiments of this invention, Figure 4 is a perspective view showing another embodiment of tube b, and Figure 5 is a perspective view showing Embodiment 1 of this invention. A: Film a, B: Tube b, C: Adhesive part, 1: Thermoplastic resin film, 2: Ink layer -
1, 3: Ink layer-2, 4: Metal vapor deposition, 5: Ink layer-3, 6: Adhesive layer, 7: Base material, 8: Biaxially stretched polyester film, 9: Yellow ink, 10:
Gold red ink, 11: Aluminum vapor deposition layer, 12:
Seal part.

Claims (1)

[Scope of utility model registration request] The ends of a highly heat-shrinkable thermoplastic film are glued together to form a tube B, and a low heat-shrinkable laminated film (hereinafter referred to as film a) consisting of at least a thermoplastic resin film, an ink layer, and a metal vapor deposition layer is attached to the inner surface of the tube b. A heat-shrinkable tube that is partially glued or temporarily attached.