JPH0826265A - Wrap film housing carton - Google Patents

Abstract

PURPOSE:To provide a wrap film housing carton which is easy to process and excellent in performance and productivity. CONSTITUTION:In a wrap film housing carton having a film cutting jig 21 and a film holding part 22 for preventing a cut film from being wound back into the carton, the film holding part 22 is formed of a coating layer mainly containing a polyester resin. The polyester resin is constituted of a kind of polyester resin wherein a dry film can be formed by heating and drying a solvent compound while the glass transition point is in a range of -20 to 75 deg.C or a mixture of two or more kinds of such resin whereby the wrap film carton whose film holdability is further stabilized and which is excellent in performance and productivity can be easily obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrap film storage having a cutting tool for cutting a roll-shaped film such as a wrap film, and a film holding function for preventing rewinding of the film end after cutting. The present invention relates to a carton, and more particularly to a technique for improving a film holding portion.

[0002]

2. Description of the Related Art Conventionally, the following methods have been proposed as measures for preventing rewinding of the film edge when cutting the film in a carton for wrapping film. That is, when a pressure-sensitive adhesive layer is provided on the front plate part that constitutes the wrap film storage box, and the tip of the side cover part glued to the position covering the front plate part is peeled off and removed. A method in which the pressure-sensitive adhesive layer is exposed on the surface of the box and the film edge after cutting is held by the pressure-sensitive adhesive layer.

Further, the box itself is formed of a material obtained by laminating a smooth film on the surface of a printed board, and the smoothness of the surface is formed on the front plate of the box which is brought into contact with the wrap film pulled out at the time of cutting. The self-adhesiveness of the wrap film is used to lock the edge of the film.
Further, Japanese Patent Laid-Open No. 64-9151 discloses a front plate surface of a portion of a front plate portion of a box and a side cover lid portion provided at a position covering the front plate portion, or a side cover lid thereof. In this method, a flat coating layer made of a cross-linking cured varnish is provided on the back surface of the part, and the self-adhesiveness of the wrap film with respect to the smooth surface of the coating layer is used for locking.

[0004]

However, in the conventional method as described above, for example, in the case of the method of using the first adhesive, it is difficult to appropriately adjust the adhesive force of the adhesive itself, and even a little. If the adhesive strength is too strong, the wrap film adheres strongly, causing film breakage when pulling out the film, and also gradually sticking dust or dust to the adhesive coated surface, and the film locking property decreases, It has the drawback of becoming unsanitary.

Further, a box body is formed of a material obtained by laminating a smooth film on the surface of the second printed paperboard,
The method of using the self-adhesion of the wrap film to lock it on the front plate of the box with a smooth surface makes the locking stability of the wrap film good, but the wrap film on the surface of the box. In order to provide smoothness that can be locked, it is usually necessary to laminate a thick film having a thickness of 10 μm or more, which is disadvantageous in that the cost becomes high. In this respect, a method of providing a flat coating layer with a third crosslinkable curing varnish on the front plate surface of the box body, or on the back surface of the side cover portion, and using the smoothness of the wrap film, Although the material cost is lower than the method of laminating the film, the electron beam irradiation device or the ultraviolet irradiation device for crosslinking and curing, or
There is a problem that a special curing device such as a heat ray irradiation device is required, and it cannot be processed at high speed by an ordinary gravure printing machine, resulting in an increase in processing cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a film holding portion for preventing rewinding of a wrap film edge after cutting into a carton. It is decided to form a coating film layer of resin with good adhesion to the wrap film, and further, in forming the coating film layer, a special curing device etc. is not required, and it is easy to use a normal gravure printing machine etc. It is intended to provide a wrapping film storage carton having a film holding portion excellent in performance and productivity, which can be formed into a sheet.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the following objects of the present invention have been achieved. That is, the invention of claim 1 is a long carton for storing a wrap film wound in a roll shape, and a cutting tool for pulling and cutting the wrap film from an opening of the carton body, and a cutting tool after cutting. A wrapping film storage carton having a film holding portion for preventing rewinding of the wrap film end into the carton, wherein the film holding portion is formed of a coating film layer containing a polyester resin as a main component. It consists of a wrap film storage carton. Then, the coating layer can be formed by applying a coating solution made of a polyester resin dissolved in an organic solvent by an ordinary gravure printing machine or the like, and drying the coating layer. It has a function to do.

Further, the invention of claim 2 is characterized in that the polyester resin is one kind or two or more kinds of polyester resins having a glass transition point of -20 ° C to 75 ° C. The wrap film storage carton described in 1. By adopting such a constitution, the adhesion of the formed coating film layer to the wrap film is further improved, and the film holding property can be made more stable.

(Preferred Embodiment) In the wrapping film storage carton of the present invention, the film holding portion for preventing the end of the wrapping film from being rewound into the carton is mainly composed of a polyester resin having good adhesion to the wrapping film. The coating resin layer is used, and the polyester resin is not of the type that forms a dried coating layer by crosslinking and curing after coating, but forms a dried coating layer by heating and drying the solvent component. We selected from the available types. Therefore, the formation of the coating layer does not require a special curing device for the crosslinking reaction, and the coating layer can be easily formed by an ordinary gravure printing machine or the like.

With respect to this polyester resin, the glass transition point is -20, especially in view of its thermal characteristics.
By using one type of polyester resin in the range of ℃ to 75 ° C, or a blend of two or more types, a more stable film holding property is obtained. That is, since the polyester resin having a glass transition point of about -20 ° C to 10 ° C is not a hard coating film at room temperature but a softened and tacky coating film, it strongly adheres when the wrap film is adhered. It becomes difficult to remove again and is not suitable for temporary holding of the film. On the other hand, the glass transition point is 50
C. to 75.degree. C. is easy to form a coating film having a smooth surface, and is a hard coating film at room temperature. Therefore, when the wrap film is adhered, the smoothness of the coating film layer helps. However, it is judged to be slightly insufficient as a coating layer for preventing film rewinding.

Therefore, when one kind of polyester resin is used, it is preferable to use one having a glass transition point of about 30 ° C. to 40 ° C., and more preferably, two or more kinds of polyester resins having different glass transition points are used. It is to use the resin by blending. That is, a smooth and hard coating film made of a polyester resin having a high glass transition point (eg, 50 ° C. to 75 ° C.) has a low glass transition point (eg, −2).
By adding a slight amount of tackiness due to the polyester resin at 0 ° C. to 10 ° C., the respective properties are complemented and more reliable film holding property is obtained.

The coating layer containing a polyester resin as a main component as described above usually has a viscosity suitable for a coating means such as gravure printing in which these resins are dissolved in an organic solvent.
It is formed by adjusting the evaporation rate and the like to obtain a coating liquid, and applying and drying the coating liquid. When the surface of the coating layer is smooth, the adhesiveness to the wrap film is better and the film holding property is improved. Therefore, it is preferable that the coating liquid for forming the coating layer has a low viscosity and is gradually dried after the coating so that the surface is leveled. For example, when applying with a gravure printing machine, the viscosity is 1 for Zahn cup No. 4.
It is preferable to apply with a low viscosity of 0 to 20 seconds.

The thickness of the coating layer when dried is 2 to 10
About 3 μm is preferable because workability of coating is good. When the thickness is 2 μm or less, the smoothness of the surface is insufficient and the holding property of the wrap film is reduced, and when the thickness is 10 μm or more, the holding property of the wrap film is not further improved, which is a waste of material and the workability is poor. However, it is not preferable. The location of the coating layer is not particularly limited as long as the wrap film is pulled out from the carton body and cut and then the wrap film contacts the carton.
Generally, when cutting a wrap film, the wrap film is sandwiched between the front plate part of the carton body and the lid part that overlaps with this, and the wrap film is cut while being pressed from the outside, so the wrap film is the front plate of the carton. It is pressed against the part and it becomes easy to adhere. Therefore, the film-holding coating layer is preferably provided on the surface of the front plate portion at a position where the film is sandwiched. The size and shape of this coating layer are arbitrary, and may be freely determined depending on the material of the wrap film, the shape of the carton, the attachment position of the cutting tool, etc. so that the film holding property is stable.

[0014]

The carton for storing the wrap film of the present invention is dried by heating and drying the solvent component in the solution as a film holding portion for preventing the end of the wrap film pulled out during use from being rewound into the carton. A coating liquid containing a polyester-based resin as a main component capable of forming a coating film,
Apply to a predetermined part of the carton by gravure printing machine,
The coating layer formed by drying is used, and the coating layer of this polyester resin has good adhesion to the wrap film and the surface is formed smoothly, so the wrap film adheres well. Let it hold. In addition, the glass transition point of the polyester resin is -2.
By comprising one kind in the range of 0 ° C. to 75 ° C. or a blend of two or more kinds of polyester resins,
It is also possible to give a slight adhesion to the coating layer,
A more reliable and stable film holding property can be obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The above-mentioned present invention will be described in more detail with reference to the drawings of the embodiments. In the wrapping film storage carton of the present invention, the site where the polyester resin coating film layer serving as the film holding portion is formed varies depending on the shape of the carton, specifically, the attachment position of a cutting tool for cutting the film. 1 to 3 exemplify typical examples of cartons having different shapes and attachment positions of the film cutting tool, and examples of suitable coating layer formation sites for the respective cartons. The coating layer forming portion is preferably a region including a position where the film is strongly pressed against the carton surface when the wrap film is cut, and as a result, the film naturally becomes a coating layer by the operation of cutting the film. It will be pressed into close contact and held.

FIG. 1 is a schematic perspective view showing a first embodiment of a wrap film storage carton of the present invention, showing a state when it is opened. Incidentally, a development view of this type of carton is shown in FIG. 4 and the names of the respective parts are described. Further, the carton of the type shown in FIGS. 2 and 3 will also be described by using this name. In the carton of FIG. 1, when the carton is assembled, the film cutting tool 21 has the cutting edge of the saw-toothed cutting tool 21 slightly forward of the bottom plate portion 3 (designated in FIG. 4) of the carton,
That is, it is attached to the surface of the bottom plate portion 3 so as to project toward the front plate portion 2. In this case, the coating layer 22 for holding the film is preferably provided on the surface of the front plate portion 2 of the carton at a position shown in the figure. By providing the wrap film at this position, when the drawn wrap film is cut, the wrap film sandwiched between the side cover part 6 and the front plate part 2 of the carton can be manually operated from the outside of the side cover part 6. Since the wrap film is fixed so as to be pressed against the surface of the front plate portion 2 and cut, the wrap film is pressed against the coating layer and comes into close contact with the coating layer.

As with FIG. 1, the cartons shown in FIGS. 2 and 3 show the states of the respective types of cartons after they have been opened. Therefore, the cartons provided on the side cover 6 shown in FIG. The part before the cut line 7 is also a glued part, which is peeled off and removed when the package is opened, and is not shown. FIG. 2 is a schematic perspective view showing a second embodiment of the wrap film storage carton of the present invention. A feature of this carton is that the saw blade-like film cutter 21 is V-shaped as shown. Therefore, the cutting tool 21 is attached to the side cover 6.
The V-shaped cutting line 7 having the same shape as that of the V-shaped cutting line 21 is provided, and when the gluing portion at the tip of the cutting line 7 is peeled off and removed, the cutting edge of the V-shaped cutting device 21 slightly protrudes. 6
It is attached to the back of the, at the position that hangs on the perforation line.
When cutting the wrap film, the side cover 6
Since the film is cut from the center of the film toward both sides while pressing the film at a position close to the V-shaped tip, the coating layer 22 of the film holding unit
Is preferably provided at the center of the surface of the front plate portion 2 of the carton or at a position closer to the upper side, as it is easy to bring the film into close contact.

FIG. 3 is a schematic perspective view showing a third embodiment of the wrap film storing carton of the present invention. The saw blade-shaped film cutting tool 21 of this carton is of a straight type unlike the case of the carton of FIG. 2, and its mounting position is at the tip of the linear cutting line 7 provided on the side cover lid portion 6. It is attached to the back surface of the side cover portion 6 so as to hang on the cutting line so that the blade edge slightly protrudes when the gluing portion is peeled off and removed. Then, the coating layer 22 for holding the film is provided on the surface of the front plate 2 of the carton at a position where the film is pressed by the side cover 6 and the film cutting tool 21, as shown in the figure.

FIG. 4 is a schematic development view of the wrap film storing carton of the present invention shown in FIG. 1 as described above, in which names of respective parts are described.

The present invention will be described below with reference to specific examples. (Example 1) Using a coated ball (paperboard) having a basis weight of 450 g / m ² as a carton material and using an in-line device for gravure rotary printing punching, printing of a predetermined pattern and overprint varnish and in-line film holding coating. Membrane layer
22 was applied and dried at a position shown in FIG. 4 using a coating liquid having the following composition, and punched into a shape shown in FIG. 4 to prepare a carton blank. Next, a straight saw blade-shaped cutting tool 21 is attached to the same position shown in FIG. 4 by a dedicated device, and is further attached to the body by a sack applicator (the surface of the front plate part 2 and the side cover part that covers the front plate part 2). Cutout line 6
The back side of the gluing part is attached in the longitudinal direction) to produce a wrap film storage carton of Example 1.

Composition of coating liquid for film-holding coating layer Polyester resin solution having glass transition point 75 ° C. (solid content 30%) 70 parts by weight Polyester resin solution having glass transition point 5 ° C. (solid content 30%) 10 Parts by weight Polyester resin solution having a glass transition point of -20 ° C (solid content 30%) 20 parts by weight Diluting solvent (toluene / methyl ethyl ketone weight ratio 1: 1) 100 parts by weight

After the wrapping film storage carton made by the above method is separately filled and wrapped with the wrapping film of polyvinylidene chloride resin, the wrapping film of polyvinyl chloride resin, and the wrapping film of polyethylene resin,
Open each, pull out the wrap film, cut,
The film retention was evaluated by the adhesion of the wrap film to the coating layer. As a result, the adhesion was good in all cases, sufficient film retention was exhibited, and the adhesion was too strong without causing film breakage.

(Example 2) In the constitution of the carton for storing the wrap film of Example 1, only the composition of the coating solution for the film-holding coating layer was changed to the coating solution of the following composition, and all other components were applied. The wrapping film storage carton of Example 2 was prepared by processing in the same manner as in Example 1. Composition of coating liquid for film-holding coating layer Polyester resin solution having glass transition point of 40 ° C. (solid content 30%) 100 parts by weight Diluting solvent (toluene / methyl ethyl ketone weight ratio 1: 1) 80 parts by weight

In the same manner as in Example 1, a wrap film of polyvinylidene chloride resin, a wrap film of polyvinyl chloride resin, and a wrap film of polyethylene resin were separately placed in the wrap film storing carton obtained as described above. After they were filled and packaged, they were opened, the wrap film was pulled out and cut, and the film retention by the adhesion of the wrap film to the coating layer was evaluated.

As a result, compared with the film adhesiveness of the coating layer having the constitution of Example 1, there is a tendency that the adhesiveness is slightly reduced only for the polyethylene resin wrap film. However, it was at a level with no problem in practical use, showed good film retention, and was good without causing film breakage.

[0026]

Since the present invention is constructed as described above, it has the following effects. In the wrapping film storage carton of the present invention, the film holding portion for preventing the rewinding of the film end is constituted by the coating film layer of the resin, and the shape of the carton (the used area of the paperboard) and the usage method are the same as the conventional one Well, no extra cost or operation required. And in the coating layer that holds the film,
Since a polyester resin is used that can form a dried coating film by simply applying the coating solution for the coating layer and heating and drying the solvent component, no special curing equipment is required, and normal gravure is used. The coating layer can be easily formed by a printing machine or the like. Therefore, it can be processed in-line with the printing of a pattern, has good productivity, is easy to manufacture, and is inexpensive.

Further, since the formed coating layer has a smooth surface and is formed of a polyester resin having good adhesion to the wrap film, the film can be easily adhered,
Has excellent retention. Furthermore, when the coating layer is made of one or more polyester resins having a glass transition point in the range of −20 ° C. to 75 ° C., the coating layer has very small surface smoothness as well as smoothness. It is also possible to give tackiness, and it is possible to form a coating layer having stable adhesion to various wrap films and excellent film retention. As described above, according to the present invention, there is an effect that it is possible to easily provide an inexpensive wrapping film storage carton having a film holding portion excellent in productivity and performance.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of a wrap film storage carton of the present invention.

FIG. 2 is a schematic perspective view showing a second embodiment of the wrap film storage carton of the present invention.

FIG. 3 is a schematic perspective view showing a third embodiment of the wrap film storage carton of the present invention.

FIG. 4 is a schematic development view of the wrap film storage carton of the present invention shown in FIG.

[Explanation of symbols]

 1 Wrap film storage carton 2 Front plate part 3 Bottom plate part 4 Rear plate part 5 Top cover plate part 6 Side cover part 7 Cutting line 21 Film cutting tool 22 Coating layer (film holding part)

Claims (2)

[Claims] 1. A long carton for accommodating a wrap film wound in a roll shape, and a cutting tool for pulling and cutting the wrap film from an opening of the carton body,
In a wrap film storage carton having a film holding portion for preventing rewinding of the end of the wrap film after cutting into the carton, the film holding portion is formed of a coating layer containing a polyester resin as a main component. Wrap film storage carton featuring. 2. The carton for storing a wrap film according to claim 1, wherein the polyester resin is one kind or two or more kinds of polyester resins having a glass transition point of −20 ° C. to 75 ° C.