US-12617597-B2 - Film-packaged tissue product collective pack and packaging material for film-packaged tissue product collective pack

Abstract

Provided is a film-packaged tissue product collective pack containing a plurality of film-packaged tissue products gusset-packaged with an exterior film into a collective pack having a handle on its top face side, wherein the exterior film is a biomass film containing 10 mass % or less biomass raw material, has a degree of blocking of 120 mN or lower, and has a tensile elastic modulus in a TD direction of 380 to 460 MPa. The collective pack may be handled and manufactured in the same way as conventional collective packs, while reduction of environmental burden may be aimed through the use of biomass raw materials.

Inventors

• Shohei Yoshida
• Yasutaka OKOUCHI
• Tatsuya Minami

Assignees

• DAIO PAPER CORPORATION

Dates

Publication Date

20260505

Application Date

20211029

Priority Date

20201030

Claims (14)

1. 1 . A film-packaged tissue product collective pack comprising: a plurality of film-packaged tissue products; and an exterior film gusset-packaging the plurality of film-packaged tissue products to form a collective pack having a handle on its upper side, wherein the exterior film is prepared from a mixture of linear low density petroleum-derived polyethylene and 3 to 10 mass % plant-derived polyethylene, wherein the exterior film has a degree of blocking of 120 mN or lower, and wherein the exterior film has a tensile elastic modulus in a transverse direction (TD) of 380 to 460 MPa.
2. 2 . The film-packaged tissue product collective pack according to claim 1 , wherein the exterior film has a haze value of 12% or lower.
3. 3 . The film-packaged tissue product collective pack according to claim 1 , wherein the electrostatic potential of the exterior film is 0.35 kV or lower.
4. 4 . The film-packaged tissue product collective pack according to claim 1 , wherein the melting point of the exterior film is 110 to 120° C.
5. 5 . The film-packaged tissue product collective pack according to claim 1 , wherein the density of the exterior film is 0.91 to 0.94 g/cm 3 .
6. 6 . The film-packaged tissue product collective pack according to claim 5 , wherein the thickness of the exterior film is about 10-65 μm.
7. 7 . The film-packaged tissue product collective pack according to claim 6 , wherein the basis weight of the exterior film is about 32.5-33.6 g/m 2 .
8. 8 . A packaging material for a film-packaged tissue product collective pack for packaging by gusset-packaging a plurality of film-packaged tissue products into a collective pack having a handle on its upper side, wherein the packaging material is a film prepared from a mixture of a linear-low density petroleum-derived polyethylene and 3 to 10 mass % plant-derived polyethylene, wherein the film has a degree of blocking of 120 mN or lower, and wherein the film has a tensile elastic modulus in a transverse direction (TD) of 380 to 460 MPa.
9. 9 . The packaging material for a film-packaged tissue product collective pack according to claim 8 , wherein the packaging material has a haze value of 12% or lower.
10. 10 . The packaging material for a film-packaged tissue product collective pack according to claim 8 , wherein the electrostatic potential of the packaging material is 0.35 kV or lower.
11. 11 . The packaging material for a film-packaged tissue product collective pack according to claim 8 , wherein the melting point of the packaging material is 110 to 120° C.
12. 12 . The packaging material of according to claim 8 , wherein the density of the packaging material is 0.91 to 0.94 g/cm 3 .
13. 13 . The packaging material for a film-packaged tissue product collective pack according to claim 12 , wherein the thickness of the packaging material is about 10-65 μm.
14. 14 . The packaging material for the film-packaged tissue product collective pack according to claim 13 , wherein the basis weight of the packaging material is about 32.5-33.6 g/m 2 .

Description

FIELD OF ART The present invention relates to a film-packaged tissue product collective pack, in which a plurality of film-packaged tissue products are packaged by gusset-packaging, each of the film-packaged tissue products being a bundle of interfolded and stacked tissues packaged with a flexible packaging film, as well as to a packaging material for such film-packaged tissue product collective pack. BACKGROUND ART There is known a package of tissues, which is a bundle of tissues packaged with a flexible packaging film made of resin, also referred to as a film-packaged tissue product. As such a film-packaged tissue product, portable products, referred to as pocket tissues, are popular, while some others are used in place, like so-called box tissues, which are a bundle of tissues enclosed in a paper-made storage box called a carton (referred to sometimes as a boxed product hereinbelow), or used as a refill of a bundle in a boxed product. Film-packaged tissue products used in this way are, like boxed products, often sold in the form of a collective pack, which is a pack of a plurality of the tissue products, such as five or three of them, packaged with an exterior film. A collective pack of the film-packaged tissue products for use in place takes substantial space, and is thus commonly packaged by gusset-packaging with a handle for portability. Conventionally, exterior films used in collective packaging are made of petroleum-derived general purpose resins, such as polyethylene and polypropylene, for their low cost. Recently, however, problems are attracting attention, such as global escalation in raw material cost of fossil fuel or environmental pollution by plastics flowing out to the ocean, and manufacturers and users are demanded to select ecological materials and products advertising “containing biomass raw materials” or “biodegradable”, from various film materials. PRIOR ART PUBLICATION Patent Publication Patent Publication 1: JP 2018-058600 APatent Publication 2: JP 2018-058654 APatent Publication 3: JP 6721773 B SUMMARY OF THE INVENTION Problems to be Solved by the Invention It is known, however, that plant-derived polyethylene, which is a biomass raw material, contains a trace amount of impurities, and thus is hard to have properties comparable to those of petroleum-derived polyethylene, even if the two are categorized in the same grade. Researches by the present inventors have revealed that, when plant-derived polyethylene is simply used as a substitutional material for the exterior film in the manufacture of the collective packs, problems arise, such as degradation of operational efficiency during gazette packaging due to higher sealing temperatures, inadequate formation of openings in gusset-packaging tubes due to higher degrees of blocking, and deterioration of colors due to higher haze values. It is therefore an object of the present invention to provide a film-packaged tissue product collective pack which may be handled in the same way as the conventional collective packs, and which may be manufactured with the same operational efficiency as the conventional collective packs, while reduction of environmental burden is aimed through the use of biomass raw materials, as well as a packaging material for such film-packaged tissue product collective pack. Means for Solving the Problem Means for solving the above problems are as follows. The first means is a film-packaged tissue product collective pack including a plurality of film-packaged tissue products, and an exterior film gusset-packaging the plurality of film-packaged tissue products to form a collective pack having a handle on its upper side, wherein the exterior film is a biomass film containing 10 mass % or less biomass raw material, has a degree of blocking of 120 mN or lower, and has a tensile elastic modulus in a transverse direction (TD) of 380 to 460 MPa. The second means is the film-packaged tissue product collective pack according to the first means, wherein the exterior film has a haze value of 12% or lower. The third means is the film-packaged tissue product collective pack according to the first or second means, wherein the exterior film is a linear low-density polyethylene film containing 3 to 10 mass % plant-derived polyethylene. The fourth means is a packaging material for a film-packaged tissue product collective pack for packaging by gusset-packaging a plurality of film-packaged tissue products into a collective pack having a handle on its upper side, wherein the packaging material is a biomass film containing 10 mass % or less biomass raw material, has a degree of blocking of 120 mN or lower, and has a tensile elastic modulus in a transverse direction (TD) of 380 to 460 MPa. The fifth means is the packaging material for a film-packaged tissue product collective pack according to the fourth means, wherein the packaging material has a haze value of 12% or lower. The sixth means is the packaging material for a film-packaged tis