JPH10101150A - Synthetic resin bag body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent appropriately transmission of ultraviolet rays without increase of the mixed ratio of an ultraviolet absorbent and increase the display effect and further, enable perspection and confirmation of the contents. SOLUTION: The required range of a bag body film 2 made of a thermoplastic synthetic resin film formed by kneading an ultraviolet ray absorbent in the resin covers a thick part 2a and other film parts except the thick area 3 of the required range have a different color from the thick area 3 or have a difference in the dense of color and further have a constitution provided with a laminate constitution or an insulative function with a film 5 having an insulative function against ultraviolet rays. The bag body film 2 having a thick part 3, the film 5 having an insulation function against ultraviolet rays, or the laminate film containing a film having an insulation function, has a different color or a different color density from each other respectively. The bag body film 2 is colorless and transparent or colored but transparent and hence, the contents can be watched through the film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin bag having a function of preventing deterioration of package contents by ultraviolet rays.

[0002]

2. Description of the Related Art Examples of articles which are easily degraded by ultraviolet rays include oil confections such as instant noodles and potato chips, foods containing fats and oils such as butter, salad oil, and baked pork; vegetable foods such as tea and laver; There are chemicals and pesticides.

[0003] As a package for protecting these articles from ultraviolet rays, a synthetic resin bag made of a film mixed with a colored light-shielding or ultraviolet absorbent, a synthetic resin bag provided with an aluminum foil layer, and a synthetic resin bag protected from light by printing. Resin bags and the like are generally employed.

[0004]

However, a synthetic resin bag provided with a colored light-shielding film or an aluminum foil layer has a disadvantage that the packaged contents cannot be visually observed. If the mixing ratio of the UV absorber is increased to obtain the required UV protection effect, the film surface may become sticky or the powder surface may be blown, giving a fatal impression to foods and pharmaceuticals. . In addition, there is a problem in that light-shielding by printing increases the number of steps, which is complicated and increases costs.

[0005] An object of the present invention is to provide a synthetic resin bag capable of appropriately preventing the transmission of ultraviolet light without increasing the mixing ratio of an ultraviolet absorber, enhancing the display effect, and enabling the contents to be seen through. That is.

[0006]

According to a first aspect of the present invention, there is provided a bag comprising a thermoplastic synthetic resin film formed by kneading an ultraviolet absorber. There, the required range of the main body film is a thick portion, while the film portion excluding the thick portion of the required range has a different color or a different shade from the thick portion. And a laminate structure including a film having a function of blocking ultraviolet light or a film having a film having a function of blocking ultraviolet light.

In the above-mentioned structure, the ultraviolet transmittance of the film having the function of blocking ultraviolet light or the laminated film including the film having the function of blocking ultraviolet light is in the thickness region of the main body film. This is equivalent to the difference between the UV transmittance of the film portion excluding the thick portion and the UV transmittance of the film portion, or lower than the UV transmittance of the thick portion.

Further, as described in claim 3, claim 1
In the configurations described in Nos. 1 to 3, the main film having a required range of thickness and a laminated film portion including a film having a function of blocking ultraviolet light or a film having a function of blocking ultraviolet light have different colors or differences in shading. Further, the main body film is colorless and transparent or colored and transparent so that the contents can be seen through.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 10 denotes a bag made of a thermoplastic synthetic resin film, and a required range of a main body film 2 formed by kneading an ultraviolet absorber is a thick portion 2a. The film portion except for the thick portion 3 has a laminated structure with a film 5 having a different color or a different shade from the thick portion and having a function of blocking ultraviolet rays.

The material of the main body film 2 is polyethylene, polypropylene, polyamide, polyvinyl alcohol, ionomer, etc., which are usually used for a package. The ultraviolet absorber kneaded into the body film 2 has no fluorescence. Organic compounds having little or no use, for example, salicylic acid ester, benzophenone, benzotriazole, and acrylonitrile-based substances are used.

A film 5 having a different color or a different shade from the thick portion 3 laminated on the film portion except for the thick portion 3 of the main body film 2 and having a function of blocking ultraviolet rays. Is a film having a white or metal (for example, titanium white or aluminum powder) dye / pigment, another film colored with a dye / pigment having a function of blocking ultraviolet rays, or a thermoplastic resin formed by kneading an ultraviolet absorber. A synthetic resin film (a different color from the main body film 2) or an opaque film is used.

Further, the thick portion 3 of the main body film 2
As shown in FIG. 2, a film 5 having a different color or a different shade from the thick portion 3 laminated on the film portion excluding the above, and having a function of blocking ultraviolet rays is formed by aluminum foil or aluminum vapor deposition. 2 having a metal film layer 6
A laminated film 8 having more than two layers may be used.

Although the bag 10 shown in FIGS. 1 and 2 is not provided with an openable / closable closing member at its opening, as shown in FIG. It is also possible to form a bag 10a in which a male / female fitting type synthetic resin fastener 7 is integrated.

The ultraviolet transmittance of the laminated film 8 including the film 5 having a function of blocking ultraviolet light and the film having the function of blocking ultraviolet light according to the above-described structure is as large as the thick region 3 of the main body film 2 and the thickness. Either corresponds to the difference in the ultraviolet transmittance of the film portion excluding the region 3 or the thick region 3
UV transmittance lower than the UV transmittance.

That is, 280 which is considered photochemically harmful
UV light of ~ 400mμ is blocked. In the above description, it is desirable to suppress the transmittance of ultraviolet light having a wavelength of 280 to 400 mμ to 10% or less.

The main film 2 having a thick portion 2a in a required range and the laminated film 8 of two or more layers including the film 5 having a function of blocking ultraviolet light and the film having a function of blocking ultraviolet light are respectively provided. The main body film 2 has a different color or a different shade, and the main body film 2 is colorless and transparent or colored and transparent so that the contents can be seen through.

Therefore, in the thick part 3, the bags 10, 10
It is possible to see through the contents enclosed in a while seeing off the ultraviolet rays.

The bag 10, 10 according to the present invention having the above configuration.
In a, by setting the required range to the thick portion 2a, the substantial amount of the ultraviolet absorber in the thick portion 3 is increased, and the thick portion 3 sees through the contents. Even if confirmation is possible, the effect of preventing ultraviolet light transmission is enhanced, and, except for the thick part 3, a laminate with a film 5 having a function of blocking ultraviolet light or a laminate of two or more layers including a film having a function of blocking ultraviolet light. The structure of the film 8 ensures a function of preventing ultraviolet light transmission equal to or higher than that of the thick portion 3. That is, for portions other than the thick portion 3,
This is because depending on the film to be laminated, a synergistic effect can be expected due to the presence of the ultraviolet absorber in the portion of the main film 2.

Therefore, since it is possible to realize sufficient blocking of ultraviolet rays without increasing the mixing ratio of the ultraviolet absorber, sticking of the film surface and a phenomenon (bleed out) such as powder blowing on the film surface occur. It is possible to provide a low-cost synthetic resin bag having a function of preventing ultraviolet transmission.

Further, by forming the main film 2 and the film laminated thereon with different colors or different shades, the thick portion 3 and the portions other than the thick portion 3 have different colors or different shades in appearance. It becomes a combination with something with a difference,
The display effect as a package can be expected by embodying the aesthetic appearance.

[0021]

As described above, according to the present invention, for a product which is easily deteriorated by ultraviolet rays, a synthetic resin bag is provided as a packaging body having a function of preventing the deterioration of ultraviolet rays and allowing the contents to be seen through. It has the advantage that the body can be provided at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a bag according to the present invention.

FIG. 2 is a cross-sectional view of a bag formed by laminating two or more layers according to the present invention.

FIG. 3 is a cross-sectional view of the bag of the present invention having a fastener formed in an opening.

[Explanation of symbols]

 2 Body film 2a Thick part 3 Thick part area 5 Film having a function of blocking ultraviolet rays 6 Metal film layer 7 Fastener 10 Bag (without fastener) 10a Bag (with fastener)

Claims (3)

[Claims] 1. A bag made of a thermoplastic synthetic resin film formed by kneading and mixing an ultraviolet absorber, wherein a required area of the main body film is a thick part, The film portion excluding the thick part region has a different color or shade difference from the thick part region, and a laminated structure with a film having a function of blocking ultraviolet rays or a laminated structure including a film having a function of blocking ultraviolet light. A bag made of synthetic resin, characterized in that: 2. The ultraviolet transmittance of a film having a function of blocking ultraviolet light or a laminated film including a film having a function of blocking ultraviolet light is determined by the thickness of the main body film and the ultraviolet transmittance of the film portion excluding the thick portion. 2. The synthetic resin bag according to claim 1, wherein the bag realizes an ultraviolet transmittance that is equivalent to the difference in the transmittance or is lower than the ultraviolet transmittance in the thick part region. 3. A main film having a required thickness and a laminated film portion including a film having a function of blocking ultraviolet light or a film having a function of blocking ultraviolet light have different colors or shades, respectively. 3. The synthetic resin bag according to claim 1, wherein the main body film is colorless and transparent or colored and transparent so that contents can be seen through.