HK1148507B - Wrap film container and label adapted for use for the container and used for forming film holding section - Google Patents

Description

Packaging film container and label for forming film holding part

Technical Field

The present invention relates to a technique for effectively forming a film holding portion for stably and continuously preventing a cut film end from being rewound into a container in a container for a packaging film in which a self-adhesive film wound in a roll shape is slightly pulled out and cut and used for packaging of food and the like, and particularly relates to a packaging film container having such a film holding portion and a label structure for effectively forming the film holding portion.

Background

A packaging film in which a self-adhesive film wound in a roll shape is slightly pulled out from a storage container and cut and used for packaging of food and the like is extremely convenient as a packaging article used at a cooking site, but if the film is once wound back into the container due to its self-adhesive property, there is a problem that a lot of troubles are caused in order to peel off an end portion adhered to a roller body, pull out the film from the storage container, and reuse the film for packaging. Therefore, a film holding portion for holding the cut end portion of the packaging film in a peelable manner and facilitating subsequent use is often formed on the front surface of the storage container body. As the film holding portion, for example, an adhesive layer (patent document 1) including a mixture of an ethylene-vinyl acetate copolymer grafted with (graft) vinyl chloride monomer and an acrylic resin, or an adhesive layer (patent document 2) including a cured product of a composition including a polyurethane elastomer and an acrylic resin, and the like are known. However, such adhesive layers have the following difficulties: control of the adhesive force is not easy, and if it is too strong, the film is broken, and as the use continues, the film holding property is lowered by adhesion of dust and/or dirt, and the film holding property is also changed by a change in the environmental temperature.

The present applicant has therefore proposed a packaging film container having a film holding portion which exhibits a moderately stable film holding force with little deterioration regardless of changes in ambient temperature when the film holding portion for attaching a packaging film to the front surface of the container is formed by utilizing the self-adhesiveness of the packaging film itself (patent document 3). However, since the self-adhesive film is generally as thin as about 5 to 20 μm and is extremely flexible, the following problems are exhibited: in either case of applying an adhesive or a pressure-sensitive adhesive to the front surface of the storage container and then attaching the film, or attaching a self-adhesive film having a pressure-sensitive adhesive layer formed on one surface thereof in advance to the front surface of the storage container, defects such as wrinkles, poor adhesion at the end portions, or lifting are likely to occur, and it is difficult to form a film holding portion having a stable film holding force because there is little trouble in the attaching operation.

Patent document 1: japanese unexamined patent publication No. 6-270395

Patent document 2: JP-A10-35657

Patent document 3: japanese laid-open patent publication No. 2008-265839

Disclosure of Invention

Accordingly, a primary object of the present invention is to provide an efficient manufacturing technique for manufacturing a film holding portion of a packaging film container that exhibits stable and continuous film holding force.

According to the studies of the present inventors, it has been found that it is extremely effective to use a self-adhesive film comprising an adhesive, a base material and a separator, the self-adhesive film being capable of being adhered to the front surface of a storage container by itself using the adhesive or the adhesive in order to achieve the above-mentioned object.

That is, the present invention provides a label for forming a film holding portion of a packaging film container having a laminated structure in which a self-adhesive film layer, an adhesive layer, a base layer, an adhesive layer, and a separator layer are arranged in this order from one side.

Further, a packaging film container of the present invention formed using such a label is an elongated container for containing a self-adhesive packaging film wound in a roll shape, and includes at least a cutting unit for cutting the packaging film drawn out from an opening provided in a longitudinal direction of the container, and a film holding portion provided on a front surface portion of a container body for preventing an end of the cut packaging film from being rewound into the container, characterized in that: the film holding section has a laminated structure in which an adhesive layer, a base layer, an adhesive layer, and a self-adhesive film layer are arranged in this order from the container body side.

According to the present invention, when the film holding portion including the adhesive layer of the self-adhesive film is formed in a relatively small portion of the front surface of the packaging film storage container, it is not necessary to separately handle the self-adhesive film having a large flexibility in a small area, and the label applicator having the separating mechanism of the separator can automatically and continuously adhere the label-like film holding portion to predetermined portions of the sheet base material for forming the plurality of packaging film storage containers, and the self-adhesive film is held in a smooth state on the label base material even if it has excessive flexibility when it is separately adhered, and is adhered to the label base material, so that the film holding portion in which the film holding force is not unstable due to the pleating can be easily and stably formed.

Drawings

Fig. 1 is a cross-sectional view showing a laminate of an example of a label for forming a film holding portion according to the present invention.

Fig. 2 is a schematic perspective view of an example of the packaging film container of the present invention.

Fig. 3 is a cross-sectional view showing a laminate of an example of a label for forming a film holding portion (for automatic bonding) of the present invention.

Description of the reference symbols

1: self-adhesive film layer, 2: adhesive layer, 3: substrate layer, 4: adhesive layer, 5: spacer, 6, 7: label detection label, 8: seam for releasing label portion, 10: label portion, 10 a: film holding portion, 20: packaging film housing container body (21: container body front face, 22: outer lid sheet), 30: roll packaging film, 40: base material tape for forming long label tape, H: serrated cutting edge

Detailed Description

The label for forming a film holding portion of a packaging film container according to the present invention has a laminated structure in which a self-adhesive film layer 1, an adhesive layer 2, a base layer 3, an adhesive layer 4, and a separator layer 5 are arranged in this order from one side, as shown in a cross-sectional view in fig. 1, and more preferably, a printed layer 6 such as a detection mark shown as a holding portion is provided on the upper surface of the base layer 2.

The self-adhesive film 1 is generally a resin composition similar to a resin constituting a self-adhesive film constituting a packaging film housed in a packaging film housing container, that is, a composition in which a plasticizer such as an aliphatic polyhydric acid ester, an aliphatic polyhydric alcohol ester, or a hydroxy acid ester is blended in a thermoplastic resin such as polyvinylidene chloride, polyvinyl chloride, polyethylene, polypropylene, polymethylpentene, or polyester in an amount of about 0.1 to 20% by weight, and a composition in which a plasticizer is blended in polyvinylidene chloride is preferably used. The thickness of the self-adhesive film 1 can be selected from a wide range for the purpose of exerting the adhesive holding force to the packaging film, but since the use of the packaging film itself is economically preferable, a thickness of 5 to 20 μm is generally used.

As the adhesive constituting the adhesive layer 2 between the self-adhesive film 1 and the label base 3, a solvent-type, solvent-free, or emulsion-type adhesive containing a main agent such as an acrylic resin-based, acetate-based, epoxy resin-based, or synthetic rubber-based one is suitably used. Among them, an aqueous emulsion type or solvent-free type adhesive containing an ultraviolet-curable acrylic resin as a main component, which is excellent in productivity and does not require treatment with a waste solvent, is preferably used. The thickness of the adhesive layer 2 is preferably about 5 to 50 μm.

As the adhesive (pressure sensitive adhesive) constituting the adhesive layer 4, an adhesive used to be disposed between a label base and a separator for label formation, that is, an adhesive obtained by blending a rosin-based or petroleum-based adhesion-imparting resin, etc. into a viscoelastic elastomer base material such as a rubber-based, urethane-based or acrylic-based resin, is generally widely used. The thickness of the adhesive layer 4 is generally slightly larger than that of the adhesive layer 2, and is about 10 to 100 μm.

The label base material 3 is a member for determining the rigidity of the label portion 10 to be attached to the front surface portion of the packaging film container body, but generally, the label base material is made of paper or plastic, and is made of a material having a rigidity greater than that of the self-adhesive film 1, and the thickness thereof is generally about 25 to 200 μm.

The separator 5 is generally made of paper or plastic having rigidity greater than that of the label base 3 (i.e., strong) and a large thickness, and has releasability by coating a release agent such as silicone resin as necessary on the interface with the adhesive layer 4, and the rigidity and thickness thereof can be basically set arbitrarily as long as it can be easily peeled from the label portion including the adhesive layer 4.

The packaging film container of the present invention can be obtained by applying the adhesive label portion 10 to the front surface of the packaging film container while peeling the separator 5 from the film holding portion-forming label structure having the above-described laminated structure.

Fig. 2 is a schematic perspective view of an opened state of an example of the packaging film container of the present invention obtained in this manner. Referring to fig. 2, the packaging film container of this example is formed by storing a roll-shaped packaging film 30 wound around a core material (not shown in particular) in a container body 20 having a rectangular parallelepiped shape which is long in the transverse direction as a whole, and attaching a film holding portion 10a to a front surface portion 21 of the container body, and according to the present invention, the film holding portion 10a is formed by a sticker portion 10 of fig. 1, and the sticker portion 10 includes a self-adhesive film layer 1, an adhesive layer 2, a base material layer 3, and an adhesive layer 4 of fig. 1.

The container main body 20 of this example has an outer lid sheet 22 having a film cutting blade H formed in a zigzag shape as a whole and attached to a lower end thereof, and in an open state shown in the figure in which the outer lid sheet 22 is lifted upward, an end portion of a packaging film 30 wound in a roll shape is grasped to pull out the packaging film by a necessary length, the packaging film is pressed against a film holding portion 10a at a portion close to the cutting blade of the lowered outer lid sheet 22, and in this state, the packaging film is cut by the cutting blade H, and a necessary amount of the packaging film cut out is used to package food and the like. The end portion of the remaining roll-shaped packaging film 30 is held by the film holding portion 10a by the self-adhesive property of the film holding portion 10a, and is used as a pulled-out end portion of the packaging film in the next use.

The use form of the packaging film using such a packaging film container is known per se from patent document 3 and japanese unexamined patent application publication No. h 10-35657, and the like, and a more detailed description thereof is not necessary.

The cutting blade H is not entirely V-shaped as in the above example but is linear, and as the shape of the film holding portion 10a, it is generally preferable that the lower shape includes a curved shape of a convex portion in order to facilitate separation of the separator as shown in fig. 2, but a deformation form such as a longer shape or a smaller shape in the longitudinal direction of the container main body 20 is known from the above patent documents and the like. The film holding portion 10a is preferably formed to have an area of about 1 to 30% of the area of the container main body front portion 21.

As described above, the container main body 20 is formed in a horizontally long rectangular parallelepiped shape in the use form, but it is generally formed by folding a thick paper sheet spread out in a flat shape as is well known (for example, japanese unexamined patent application publication No. h 10-35657). Accordingly, the label portion 10 for forming the film holding portion 10a may be attached to the corresponding portion of the flat thick paper corresponding to the container main body front surface portion 21. This allows the label portion 10 to be continuously attached to a plurality of flat thick paper materials corresponding to the container main body 20 while peeling the separator 5. Such a method of continuously sticking labels and a label sticking device (label sticking apparatus) used for the method are well known in japanese patent application laid-open nos. 8-26236 and 10-258818, and can be applied to a flat raw material sheet continuously sticking the labels to a packaging film container using the label for forming a film holding portion of the present invention. In order to apply the continuous sticking method, it is necessary to elongate the label for forming the film holding portion having the laminated structure described in fig. 1, and use a label stock having a plurality of stick-on label portions 10 on an elongate separator 5, the plurality of stick-on label portions 10 each having a laminated structure of a self-adhesive film layer 1, an adhesive layer 2, a base layer 3, and an adhesive layer 4 and being separated from each other; however, according to a usual method, a continuous label attaching operation may be performed by removing a residue portion adhered to the periphery of the film holding portion 10a of the thick paper material corresponding to the container main body front surface portion 21 in advance, or the residue portion may be formed and removed at the same time in a continuous label attaching device (for example, japanese unexamined patent application publication No. h 10-258818), and the method is arbitrary.

Examples

A long label having a laminated structure as shown in fig. 3 suitable for automatic label application by a label applicator is formed in substantially the same manner as in fig. 1. In fig. 3, the same reference numerals as those in fig. 1 denote the same parts as those in fig. 1.

Referring to FIG. 3, a long strip substrate 40 having a total thickness of 158 μm, a width of 230mm and a length of 400m, which was prepared by previously laminating a polypropylene (OPP) substrate film 3 having a thickness of 50 μm and a release paper 5 having a thickness of 88 μm via an acrylic resin adhesive layer 4 having a thickness of 20 μm, was prepared. Then, while the tape base 40 is wound out from the roll, alignment marks 7 (marks for sequentially peeling off the release paper 5 from the individual labels by the automatic label sticking machine) are sequentially printed with UV-curable black ink on the back surface of the release paper 5, detection marks 6 of the individual labels are sequentially printed with UV-curable green ink on the surface of the base film 3 (for subsequent label sticking position confirmation of the thick paper for forming the carton (packaging film container) by the automatic label sticking machine and for position confirmation of the film holding portion 6a on the carton by the packaging film user), and further UV curing is performed. Subsequently, an acrylic copolymer-based UV curable transparent adhesive ("ACRYTACK T-1050" manufactured by No-tape kogyo.k.k.) was applied to the surface of the base film 3 on which the detection marks 6 were printed, with the tape base material 40 being moved, with a thickness of about 10 μm, and a vinylidene chloride-based packaging film 1 (NEW Krewrap "manufactured by kureha) having a thickness of 10 μm, a width of 220mm, and a length of 1000m was laminated thereon while being wound out from the roll, and further UV-dried to form a label primary tape having a laminated structure substantially as shown in fig. 3. Next, while the label stock tape is moved, a release slit 8 (fig. 3) penetrating from the packaging film 5 from which the release paper 5 is removed to the adhesive layer 4 is formed in the shape of the individual label 10a in fig. 2, unnecessary portions (residue portions) around the slit are removed, the slit is cut in the longitudinal direction and divided into 6 parts, and the 6 parts are rolled up, whereby 6 long label stocks having a width of 34cm and a length of 400m and each having about 1 ten thousand 6 thousand individual labels are obtained. It was confirmed that the label stock thus obtained was suitable for automatically applying the individual label 10a to a packaging film ("NEW Krewrap" manufactured by kureha) at a predetermined portion of a box containing a thick paper for formation using an automatic label applicator ("S60J label applicator" manufactured by japan electric machine corporation).

It was confirmed that the packaging film holding portion 10a attached to the predetermined portion of the thick paper for forming the packaging film storage carton as described above was an extremely flat packaging film holding portion without any defects such as wrinkles, defective adhesion at the end portions, and curling.

The thick paper for forming a packaging film storage carton and the packaging film to be held ("NEW Krewrap" manufactured by kureha) to which the label 10a for holding a packaging film (width 30mm) was attached at a predetermined position as described above were stored at 10 ℃ and 23 ℃ for 1 hour, respectively, and then the packaging film was placed on the label under the same environment, and pressurized by a 2Kg roller, and then the T peel adhesion strength (peel angle 90 °) and the shear adhesion strength (peel angle 0 °) between the packaging film and the label were measured. For comparison, the T peel adhesion strength and shear adhesion strength to a packaging film were also measured for a film holding portion made of a coating cured product (referred to as "SP" varnish cured film) containing a composition disclosed in patent document 2, the composition including a polyurethane elastomer and a non-reactive acrylic resin. The results (average of 5 specimens) are shown in table 1 below.

TABLE 1

The film holding portion comprising a label having the packaging film itself on the surface thereof according to the present invention shows a very small T peel adhesion strength to the packaging film regardless of temperature change as compared with the SP varnish cured film, and the shear adhesion strength also shows a value close to an ideal range of experience from the viewpoint of appropriate holding power and prevention of breakage of the packaging film, i.e., 700 to 1500g · f.

Further, as a practical test, after the packaging film storage carton 20 having the shape of fig. 2 was formed by a predetermined method from the packaging film storage carton forming cardboard having the packaging film holding label 10a attached to a predetermined portion formed as described above, the operations of winding out, cutting out, packaging food, and the like of the general method were repeated 300 times (that is, the operations of winding out and cutting the packaging film 30 of 60m in total were repeated 1 time for 1 minute while replacing the packaging film roll 30 in the same carton 20) as shown in fig. 2, and storing the vinylidene chloride-based packaging film roll 30 (NEW Krewrap) having a width of 300mm and a length of 20 m. As a result, it was confirmed that: the film holding portion 10a exhibits extremely good resistance to a rewinding force that operates as a shearing force parallel to the surface thereof, while exhibiting almost no adhesion resistance to peeling in a direction orthogonal to the surface thereof (T-peeling), and a series of packaging operations proceed extremely smoothly. In addition, in this period, the film holding ability of the film holding portion 10a was hardly changed.

As described above, according to the present invention, the packaging film having preferable characteristics as a member for forming the film holding portion of the packaging film container which stably and continuously exerts a film holding force with a small temperature dependency is formed into a label structure including an adhesive, a base material, and a spacer without being directly adhered to the front surface of the packaging film container, whereby it is possible to eliminate the disadvantages such as complication of the adhering work due to excessive flexibility of the packaging film, instability of the film holding force due to wrinkles of the formed film holding portion, poor adhesion of the end portion, lifting, and the like, and to form the film holding portion by automatic and continuous adhesion by the label applicator.

Claims (6)

1. A packaging film container which is a long container for storing a self-adhesive packaging film wound in a roll shape, and which is provided with at least a cutting unit for cutting the packaging film pulled out from an opening provided in a longitudinal direction of the container, and a film holding portion provided on a front surface portion of a container body for preventing an end of the cut packaging film from being rewound into the container, characterized in that:

the film holding section has a laminated structure in which an adhesive layer, a base layer, an adhesive layer, and a self-adhesive film layer made of the same material as the packaging film are arranged in this order from the container body side.

2. The packaging film container according to claim 1, wherein: the self-adhesive film layer and the wrapping film each include polyvinylidene chloride blended with a plasticizer.

3. A label for forming a film holding portion of a packaging film container, characterized in that: the packaging film has a laminated structure in which a self-adhesive film layer, an adhesive layer, a base layer, an adhesive layer, and a separator layer are arranged in this order from one side, and the self-adhesive film layer is made of the same material as the packaging film.

4. A label for forming a film holding portion of a packaging film container according to claim 3, wherein: the detection marks of the individual labels are provided on the side surface of the self-adhesive film layer of the base layer and on the surface of the separator layer opposite to the self-adhesive film layer, and the overall shape is a long strip shape suitable for automatic attachment of a plurality of individual labels.

5. The label for forming a film holding portion of a packaging film container according to claim 4, wherein: each of the plurality of individual labels having a laminated structure is provided separately on a long separator, and the laminated structure of each of the plurality of individual labels includes a self-adhesive film layer, an adhesive layer, a base layer having an individual label detection mark on its opposite surface, and an adhesive layer.

6. The label for forming a film holding portion of a packaging film container according to claim 4 or 5, wherein: the laminated structure of the unnecessary portion to be removed includes a self-adhesive film layer, an adhesive layer, a base layer, and an adhesive layer.