JP2016124548A - Carton blank, manufacturing method thereof, and carton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent problems such as removal of a cutting blade and staining of a roll body caused by water leakage by increasing waterproofness around a hot melt adhesive in a carton for business use, having the cutting blade fitted to the bottom plate of a body via the hot melt adhesive and configured to store the sheet roll body such as wrap film.SOLUTION: A surface coat layer 700 including a mold-releasing agent is formed on the surface of a sheet material 500 excluding a non-formation area 701, along the end of the non-formation area 701, a protective coat layer 800 having adhesiveness with a hot melt adhesive 600 and the surface coat layer 700 and including no mold-releasing agent is formed on the surface of the sheet material 500 in the non-formation area 701, and a cutting blade 300 and the protective coat layer 800 are bonded together via the hot melt adhesive 600 in the non-formation area 701.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a carton provided with a cutting blade for storing a long sheet such as a wrap film wound in a roll shape and cutting a sheet drawn to a predetermined length, and more particularly to a carton blank and a method for manufacturing the same. .

  Conventionally, as a carton for storing rolls of sheets such as wrap films, cooking sheets, and aluminum foil, a box-shaped main body for storing these rolls, a lid connected to the main body, and a drawn sheet are used. A structure provided with a cutting blade attached to a main body or a lid for cutting is common. And a main body and a cover body are normally shape | molded by cutting out one sheet | seat material in a predetermined shape, and bend | folding in a predetermined location.

  In recent years, non-metal cutting blades made of paper or resin have been used as cutting blades because they can be discarded without being removed from the main body or the lid. Conventionally, such a non-metallic cutting blade has been attached to a sheet material by glue bonding, but the blade width has to be widened in consideration of sticking out of the glue. For this reason, recently, an ultrasonic sealing method has been adopted in which the protrusion is small and the blade width can be narrowed. This system is a system in which a hot melt adhesive is interposed between a cutting blade and a sheet material, an ultrasonic wave is applied to the hot melt adhesive to melt it, and heat fusion is applied to the cutting blade and the sheet material. (See Patent Document 1).

JP 7-52946 A

  In the carton described above, for the purpose of waterproofing and protection of printing, an OP varnish or a release varnish is applied to the surface of the sheet material on the outside of the carton to form a surface coat layer. These OP varnishes and release varnishes have poor adhesion to commonly used hot melt adhesives. In a household carton where the cutting blade is attached to the back side of the lid, there is no problem in providing a surface coat layer on the entire sheet material that is outside the carton. However, in a commercial carton where the cutting blade is attached to the front side of the bottom plate of the main body, if the surface coat layer is formed on the entire sheet material, the cutting blade is bonded to the sheet material with a hot melt adhesive. Will not be able to.

  Therefore, in the carton for business use, the surface coat layer is formed except for the region where the hot melt adhesive is in contact. However, if a gap is generated between the hot melt adhesive and the surface coat layer at the time of bonding, the surface of the sheet material that is inferior in waterproofness is exposed, and water easily enters the sheet material. In addition, even if the surface coat layer and the hot melt adhesive are partially overlapped so that the surface of the sheet material is not exposed, the surface coat layer and the hot melt adhesive are not bonded. There was a risk of water entering from the interface. In particular, commercial cartons are often used around water, and when the bottom plate comes into contact with a work table wet with water, when the sheet material surface is exposed, the surface coat layer and hot melt adhesive Water enters the sheet material from the interface.

  When water enters the sheet material, the sheet material may be swollen and the cutting blade may be detached from the sheet material. In addition, since the back of the sheet material inside the carton is not waterproofed, if water enters from the outside of the carton, the roll body stored inside the carton may be contaminated. There was also.

  An object of the present invention is to improve the water resistance around the hot melt adhesive in a carton for business use in which a cutting blade is attached to the bottom plate of the main body via a hot melt adhesive, and the cutting blade comes off. It is to prevent the occurrence of problems due to water wetting, such as body contamination. Furthermore, it is providing the carton blank which can provide the carton which reduced the said problem, and its manufacturing method.

In the first aspect of the present invention, the sheet material having a surface coating layer containing a release agent on the surface except for a part of the non-formation region, and the hot melt adhesive in the non-formation region by heat fusion. A carton blank having a cutting blade bonded to a sheet material,
In the non-formation area of the surface of the sheet material, along the edge of the non-formation area, there is a protective coat layer that does not contain a release agent and has adhesiveness with the hot melt adhesive and the surface coat layer It is formed.

The carton blank of the present invention includes the following configuration as a preferred embodiment.
The protective coating layer is not formed in the central portion of the sheet material in the region where the hot melt adhesive is bonded, and the hot melt adhesive is directly applied to the sheet material in the central portion. Be in contact.
The cutting blade is a long cutting blade having a cutting edge along the length direction, and the hot-melt adhesive is disposed along the length direction of the cutting blade.
The cutting blade is made of a PLA resin sheet or a vulcanized fiber sheet having a moisture-proof coating on the surface.

The second of the present invention has a bottom plate, a front plate raised from the bottom plate, left and right side plates and a back plate, and a box-shaped main body for storing a roll body of a long sheet;
A lid having an upper surface plate that is continuous with an upper edge of the back plate and covers an upper surface opening of the main body, and a lid piece that is continuous with a front edge of the upper surface plate;
A carton comprising a non-metallic cutting blade attached to the front edge of the bottom plate,
The carton blank of the present invention is formed by being bent at a predetermined position.

3rd of this invention is a manufacturing method of the carton blank which adhere | attaches a sheet | seat material and a nonmetallic cutting blade by the thermal fusion of a hot-melt-type adhesive agent,
Forming a surface coat layer containing a release agent on the surface of the sheet material excluding a part of the non-forming region;
A protective coating layer that does not contain a release agent and has adhesiveness with the hot melt adhesive and the surface coating layer is formed in the non-formation region of the surface of the sheet material along the edge of the region. ,
Overlaying the sheet material and the cutting blade through the hot melt adhesive in the non-formation region of the sheet material,
By applying an ultrasonic wave to the hot melt adhesive, the sheet material and the cutting blade are bonded via the hot melt adhesive.

The manufacturing method of the carton blank of this invention includes the following structure as a preferable aspect.
Do not form the protective coating layer at the center of the sheet material in the region where the hot melt adhesive is bonded.
The cutting blade is a long cutting blade having a cutting edge along the length direction, and the hot melt adhesive is disposed along the length direction of the cutting blade.
The cutting blade is made of a PLA resin sheet or a vulcanized fiber sheet having a moisture-proof coating on the surface.

  In the present invention, since the region not protected by the surface coat layer is protected by the protective coat layer, water does not enter the sheet material even if the cutting blade or its periphery gets wet. Therefore, according to this invention, even if it uses around water, the carton which does not generate | occur | produce the problem that a cutting blade remove | deviates and a roll body is contaminated is provided.

It is a top view which shows one Embodiment of the carton blank of this invention. It is a perspective view which shows the state which pulled out the sheet | seat accommodated in the carton which shape | molded the carton blank of FIG. It is the perspective view which showed a mode that the package body which accommodated the roll body in the carton which shape | molded the carton blank of FIG. 1 was opened. It is a cross-sectional schematic diagram which shows the process of adhere | attaching a cutting blade on a sheet | seat material in the carton blank of this invention. It is a cross-sectional schematic diagram which shows the state which has arrange | positioned the hot-melt-type adhesive agent to the sheet | seat material, when adhere | attaching a cutting blade on a sheet | seat material in the carton blank of this invention. It is a cross-sectional schematic diagram which shows the adhesion | attachment process at the time of using the laminated body of a sheet material and a hot-melt-type adhesive agent, when bonding a cutting blade to a sheet material in the carton blank of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In the drawings referred to below, the same reference numerals denote the same components. In addition, the dashed-dotted line in FIG. 1 shows a folding part.

  The carton of the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 1, the carton of the present invention includes a main body 100, a lid body 200, and a cutting blade 300. And as shown in FIG. 2, the roll body of the sheet | seat 400 is accommodated in the main body 100 of a carton, and it is set as a package body.

  As shown in FIG. 1, the carton of the present invention can be molded by cutting out from a single sheet material 500 except for the cutting blade 300, bending and fixing a predetermined portion with an adhesive or the like. The sheet material 500 used in the packaging box of the present invention is usually paper having elasticity and flexibility. As will be described later, the surface coating is applied to the outer surface of the carton except for some non-formation regions. The layer is coated. Further, as shown in FIG. 1, the cutting blade 300 is attached to the front plate 20 side end (front edge) of the bottom plate 10 of the main body 100 so that the blade tip protrudes from the bottom plate 10.

  The cutting blade 300 used in the present invention is made of non-metal, and a paperboard or a resin sheet having high adhesiveness with a hot melt adhesive is used. Preferably, it is a PLA (polylactic acid) resin sheet or a vulcanized fiber sheet having a moisture-proof coating formed on the surface. PLA resin is a plant-derived biodegradable plastic, and vulcanized fiber is made by immersing and laminating a base paper made of wood or cotton fibers in a zinc chloride solution to expand and dissolve the fibers, and then remove the zinc chloride and dry it. These materials can be discarded by incineration. Examples of the moisture-proof coating of the vulcanized fiber sheet include a PE (polyethylene) film and a PET (polyethylene terephthalate) film.

  The sheet 400 stored in the carton of the present invention is mainly food, cooking wrap film, aluminum foil, and cooking sheet, but the use is not particularly limited as long as it is a similar sheet. These sheets 400 are provided in the form of a long sheet, wound around a cylindrical core material, or wound into a cylindrical shape without using a core material to form a wound roll, and are placed in the main body 100 of the carton of the present invention. Stored.

  As shown in FIGS. 1 and 2, the main body 100 includes a bottom plate 10, a front plate 20, left and right side plates 30 a and 30 b, and a back plate 40 that are connected to the four sides of the bottom plate 10 through folding portions. doing. Then, the front plate 20, the side plates 30 a and 30 b, and the back plate 40 are bent at 90 ° through the folding portions and raised from the bottom plate 10 to form the box-shaped main body 100. In the present embodiment, auxiliary pieces 21a and 21b are provided on the left and right sides of the front plate 20 via folding parts, and auxiliary pieces 41a and 41b are provided on the left and right sides of the back plate 40 via folding parts, respectively. Therefore, when the front plate 20, the side plates 30a and 30b, and the back plate 40 are respectively raised from the bottom plate 10, the auxiliary pieces 21a and 41a are respectively connected to the front plate 20 and the back plate 40 through the folding portions. The auxiliary pieces 21b and 41b are bent from the front plate 20 and the back plate 40 to the inner side of the side plate 30b by folding them at 90 ° through the folding portions, respectively. The box shape of the main body 100 can be maintained by being attached and fixed via an agent.

  The lid 200 has an upper surface plate 50 connected to the upper edge of the back plate 40 of the main body 100 via a folding portion, and a lid cover piece 60 connected to the front edge of the upper surface plate 50 via the folding portion. . Therefore, by folding the top plate 50 from the back plate 40 through the folding part to 90 ° and further fixing the lid piece 60 from the top plate 50 through the folding part to 90 °, the lid plate 60 and the top plate are fixed. The lid body 200 in which the angle of the folded portion, which is the boundary with 50, is fixed at 90 ° is formed. In the present embodiment, side edge plates 51 a and 51 b are provided on the left and right sides of the upper surface plate 50 via folding parts, and auxiliary pieces 61 a and 61 b are provided on the left and right sides of the lid cover piece 60 via folding parts, respectively. Therefore, the side edge plates 51a and 51b are bent from the upper surface plate 50 to 90 ° via the folding portion, and similarly the auxiliary pieces 61a and 61b are bent from the lid cover piece 60 to 90 ° via the folding portion, By bonding the piece 61a, the side edge plate 51b, and the auxiliary piece 61b, the lid cover piece 60 can be fixed in a state of being bent at 90 ° from the upper surface plate 50.

  In this example, as shown in FIGS. 1 and 2, an inner flap is connected to the upper edge of the front plate 20 via a folding portion and is bent inward via the folding portion and protrudes toward the back plate 40. 90 is provided. The inner flap 90 has an effect of preventing the roll body stored in the main body 100 from popping out when the sheet 400 is pulled out.

  In this example, as shown in FIG. 1, an opening plate 70 connected to the lid cover piece 60 via a perforation 80 is disposed at the lower end of the lid cover piece 60, and the opening plate 70 is bonded to the front plate 20 of the main body 100. The lid 200 is fixed to the main body 100 by pasting with an agent or the like. At this time, the tip of the cutting blade 300 attached to the bottom plate 10 is covered with the opening plate 70, and when opening, the lid 200 is opened by separating the opening plate 70 at the perforation 80, as shown in FIG. The tip of the cutting blade 300 is exposed, and the sheet 400 can be cut.

  Next, the carton blank of the present invention and the manufacturing method thereof will be described with reference to FIGS. 1 and 4 to 6.

  As shown in FIG. 1, the cutting blade 300 is attached to the bottom plate 10 of the main body 100 in the carton blank of the present invention. At this time, the cutting edge 300 is attached so that the cutting edge portion protrudes from the bottom plate 10 toward the front plate 20. The cutting blade 300 and the sheet material 500 are bonded via a hot melt adhesive (not shown in FIG. 1).

  The sheet material 500 used in the present invention is provided with a surface coat layer for waterproofing and printing protection on the outer surface of the carton. The surface coat layer usually contains a release agent such as microcrystalline wax. And poor adhesion to hot melt adhesives. Therefore, as shown in FIG. 4A, the surface coat layer 700 is formed except for the non-forming region 701, with the region where the hot melt adhesive 600 is in contact as the non-forming region 701. FIG. 4A shows an example in which the non-forming region 701 is formed by taking into account the extent that the hot-melt adhesive 600 is melted by applying ultrasonic waves and spreads around. Further, reference numeral 301 in the figure denotes a cutting edge portion of the cutting blade 300, and the cutting edge portion 300 needs to protrude from the bottom plate 10 when formed into a carton, so that it is not adhered to the sheet material 500. Therefore, the surface coat layer 700 is provided on the surface of the sheet material 500 corresponding to the blade edge portion 301.

  In the present invention, the protective coat layer 800 is formed in the non-forming region 701 along the edge of the non-forming region 701. The protective coat layer 800 does not contain the above-described release agent, and has good adhesiveness with the hot melt adhesive 600 and the surface coat layer 700. Further, like the surface coating layer 700, the protective coating layer 800 has a function of repelling water and simultaneously curing the surface of the sheet material 500, and can impart good waterproof properties to the sheet material 500. Therefore, the protective coat layer 800 is formed with a sufficient width inward from the end side of the non-formation region 701 of the surface coat layer 700 so that the surface of the sheet material 500 is not exposed after bonding. Further, the surface coat layer 700 and the protective coat layer 800 may overlap with each other at their ends.

  The hot-melt adhesive 600 is interposed between the sheet material 500 on which the surface coat layer 700 and the protective coat layer 800 are formed as described above and the cutting blade 300, and the cutting blade 300 and the sheet material 500 are overlapped, An ultrasonic wave is applied to the hot-melt adhesive 600 to melt it by heat, and it is thermally fused to the cutting blade 300 and the sheet material 500. In FIG. 4, the hot melt adhesive 600 is disposed on the cutting blade 300 and then the cutting blade 300 is stacked on the sheet material 500, but as shown in FIG. 5, the hot melt adhesive is applied to the sheet material 500. The cutting blade 300 may be stacked on the sheet material 500 after the 600 is disposed.

  As shown in FIG. 4B, in the carton blank of the present invention, since the protective coat layer 800 is formed along the edge in the non-formation region 701 of the surface coat layer 700, the hot melt adhesive Even if a gap is generated between the agent 600 and the surface coat layer 700, the gap is covered with the protective coat layer 800, and the surface of the sheet material 500 is not exposed. Therefore, even if the cutting blade 300 of the carton of the present invention and the periphery thereof get wet with water, the water does not enter the sheet material 500. Further, since the surface coat layer 700 and the protective coat layer 800 have good adhesiveness, there is no fear that water will permeate from these interfaces.

  Furthermore, in this invention, as shown to Fig.4 (a), the non-formation area | region 801 which does not form the protective coat layer 800 in the center part in the area | region where the hot-melt-type adhesive agent 600 adhere | attaches the sheet | seat material 500. It may be provided. In the non-formation region 801, the surface of the sheet material 500 is exposed, and the sheet material 500 and the hot melt adhesive 600 are directly contacted and bonded. As described above, by providing the region 801 in which the sheet material 500 and the hot melt adhesive 600 are directly bonded, some inconvenience occurs in the protective coat layer 800, and the protective coat layer 800 and the hot melt adhesive 600 are separated. Even when the adhesiveness is lowered, the non-formation region 801 ensures the adhesion between the sheet material 500 and the hot melt adhesive 600.

  4 and 5, the width of the hot melt adhesive 600 is narrower than the width of the cutting blade 300, but it may be the same width. FIG. 6 is an adhesion process diagram in the case where a laminate in which the raw material of the cutting blade 300 and the hot-melt adhesive 600 are laminated in advance and cut into the shape of the cutting blade 300 is used. Also, a hot melt adhesive 600 is laminated. Even in such a form, as in the step of FIG. 4, if the surface coat layer 700 is formed on the surface of the sheet material 500 corresponding to the blade edge portion 301, the hot melt adhesive 600 and the blade edge portion 301 are formed. Since the front coat layer 700 is not bonded, when the front plate 20 is bent and raised from the bottom plate 10 after bonding, the blade edge portion 301 does not follow the front plate 20 but protrudes from the bottom plate 10.

  As the hot melt adhesive 600 used in the present invention, one having high adhesiveness with the sheet material 500 and the cutting blade 300 is used, and preferably an EMMA (ethylene-methyl methacrylic acid) resin having a melting point of 100 ° C. or less. Any one of PE (polyethylene) resin having a melting point of 100 ° C. or higher and PLA (polylactic acid) resin having a melting point of 200 ° C. or higher is used.

  The surface coat layer 700 according to the present invention can be formed by coating a commercially available OP (Over Print) varnish or a release varnish. These varnishes are provided as UV curable varnishes having a photosensitive monomer as a main component or oil-based varnishes having thermosetting properties, and both contain microcrystalline wax (solid paraffin) as a release agent.

  The UV curable varnish is a varnish having a property of being cured by irradiation with active energy rays such as ultraviolet rays and visible rays, and usually comprises 40 to 80% by weight of a photosensitive monomer and 20 to 60% by weight of a photosensitive resin. 1-10 mass parts of photoinitiators and 1-5 mass parts of silica are included with respect to 100 mass parts of the composition. The photosensitive monomer and the photosensitive resin include a compound having at least one functional group that undergoes polymerization or curing reaction upon irradiation with active energy rays. For example, a monofunctional monomer, a bifunctional or higher polyfunctional monomer, a functional oligomer, a functional polymer, or the like of a compound having a radical polymerizable unsaturated double bond is used. In addition, a photosensitive monomer or photosensitive resin having any of an acryloyl group, a methacryloyl group, an allyl group, and an epoxy group can be used as a functional group that is polymerized or cured by ionizing radiation.

  Moreover, as said oil-based varnish, the varnish etc. which used urethane resin coating material or phenol maleic acid resin as the main resin component, and used light oil as the main solvent component can be used.

  These varnishes can be formed into the surface coat layer 700 by applying to the sheet material 500 and irradiating active energy rays such as ultraviolet rays and visible rays or heating as necessary. As a varnish coating method, printing means such as offset printing can be used.

  Furthermore, as the protective coating layer 800 according to the present invention, a release agent is not included, and a varnish having adhesiveness with the hot-melt adhesive 600 and the surface coating layer 700 is used. As the varnish, those having the same composition as the OP varnish and oily varnish are preferably used except that the release agent is not included. These varnishes, like the surface coat layer 700, are applied to the sheet material 500 using printing means such as offset printing, and are irradiated with active energy rays such as ultraviolet rays and visible rays, or heated as necessary. Thus, the protective coat layer 800 can be obtained.

  As shown in FIG. 1, the cutting blade 300 according to the present invention is a long cutting blade having a cutting edge along the length direction because it is attached along the length direction of the bottom plate 10. The hot-melt adhesive 600 can be firmly bonded to the cutting blade 300 and the sheet material 500 by being arranged linearly along the length direction of the cutting blade 300. It is not limited to. The hot melt adhesive 600 may be disposed in a plurality of locations in the form of dots along the length direction of the cutting blade 300. In the case of a dot shape, each dot may have any shape such as a rectangle such as a rectangle or a triangle, a circle, or an ellipse. Further, with respect to the dot-shaped hot melt adhesive 600, the non-formation region 701 of the surface coat layer 700 may be a dot or a straight line including a plurality of hot melt adhesive 600 dots. In either case, the protective coat layer 800 may be formed between the hot melt adhesive 600 and the surface coat layer 700 so that the surface of the sheet material 500 is not exposed.

  Further, the shape of the non-forming region 801 of the protective coat layer 800 is not particularly limited as long as it is in a region overlapping the hot melt adhesive 600. When the hot melt adhesive 600 is disposed linearly along the length direction of the cutting blade 300, the non-formation region 801 of the protective coat layer 800 is within the region overlapping the hot melt adhesive 600. It does not matter whether it is linear or dot-like. In the case of a dot shape, each dot may have any shape such as a rectangle such as a rectangle or a triangle, a circle, or an ellipse. When the hot melt adhesive 600 is disposed in a dot shape, a non-formation region 801 of the protective coat layer 800 may be provided in each dot.

  A laminate formed by laminating an EMMA resin having a thickness of 40 μm on a PLA resin sheet having a thickness of 250 μm was formed to produce a long laminate having a width of 9 mm.

  An OP varnish containing a hot-melt adhesive and a release agent on the white processed surface of a coated ball ("CRC" manufactured by Rengo Co., Ltd.) with a white surface on one surface of the cardboard as a sheet material A UV curable varnish ("TOKA SP-2" manufactured by T & K TOKA Co., Ltd.) is printed by offset printing, and a protective coating layer is formed by UV irradiation. The sample was laminated on the sheet material so that the resin was in contact with the protective coating layer, and ultrasonic waves were applied to the EMMA resin to bond the laminate to the sheet material to obtain a sample of Example 1. Moreover, the said laminated body was directly adhere | attached on the said sheet material directly, without printing the said UV curable varnish, and it was set as the sample of the comparative example 1.

  Each of the samples of Example 1 and Comparative Example 1 stored at 20 ° C. for 24 hours, and those in which the periphery of the laminate of the samples was immersed in water for 15 seconds so that the back surface of the sheet material was not wetted The peel strength was measured. Specifically, a 90 degree peel test is performed by pressing one end of the laminate in the length direction and pulling the other end upward at a speed of 300 mm / min, and the peel strength is measured using a strograph (tensile tester). did. Since the width of the sample laminate was 9 mm, the obtained measurement value was converted to a peel strength of 15 mm width.

  As a result, the peel strength after storage at 20 ° C. for 24 hours was 4.49 N / 15 mm width in Example 1, whereas 3.77 N / 15 mm width in Comparative Example 1. In Example 1, the protective coat layer formed a hard layer, and in the measurement of peel strength, delamination occurred inside the sheet material after the protective coat layer broke, and a high peak was observed for a moment. Therefore, the peel strength of Example 1 was higher than that of Comparative Example 1.

  In addition, the peel strength after being immersed in water for 15 seconds is 2.39 N / 15 mm width in Example 1, while 1.59 N / 15 mm width in Comparative Example 1. The sheet material was soft and the laminate was easy to come off.

  Furthermore, instead of the protective coating layer of Example 1, UV curable OP varnish (“A-3” manufactured by T & K TOKA Co., Ltd .: containing 3% by mass of microcrystalline wax) containing a release agent was used for the sheet material. An attempt was made to adhere the laminate in the same manner as in Example 1 except that the surface coating layer was formed by applying offset printing on the surface and irradiating UV, but the EMMA resin adhered to the sheet material. Was not. That is, the peel strength was 0 N / 15 mm width.

  10: bottom plate, 20: front plate, 21a, 21b: auxiliary piece, 30a, 30b: side plate, 40: back plate, 41a, 41b: auxiliary piece, 50: top plate, 51a, 51b: side edge plate, 60 : Lid piece, 61a, 61b: auxiliary piece, 70: opening plate, 80: perforation, 90: inner flap, 100: main body, 200: lid, 300: cutting blade, 400: sheet, 500: sheet material, 600 : Hot melt adhesive, 700: surface coat layer, 701: non-formation region of surface coat layer, 800: protective coat layer, 801: non-formation region of protective coat layer

Claims (9)

A sheet material in which a surface coat layer containing a release agent is formed on the surface except for a part of the non-formed region, and a cut bonded to the sheet material by heat fusion of a hot melt adhesive in the non-formed region A carton blank with a blade,
In the non-formation area of the surface of the sheet material, along the edge of the non-formation area, there is a protective coat layer that does not contain a release agent and has adhesiveness with the hot melt adhesive and the surface coat layer A carton blank characterized by being formed. The protective coating layer is not formed at the center of the sheet material in the region where the hot melt adhesive is bonded,
The carton blank according to claim 1, wherein the hot melt adhesive is in direct contact with the sheet material in the central portion.   The cutting blade is a long cutting blade having a cutting edge along the length direction, and the hot melt adhesive is disposed along the length direction of the cutting blade. The carton blank according to claim 1 or 2.   The carton blank according to any one of claims 1 to 3, wherein the cutting blade is made of a PLA resin sheet or a vulcanized fiber sheet having a moisture-proof coating formed on a surface thereof. A bottom plate, a front plate raised from the bottom plate, left and right side plates, and a back plate, and a box-shaped main body for storing a roll of a long sheet;
A lid having an upper surface plate that is continuous with an upper edge of the back plate and covers an upper surface opening of the main body, and a lid piece that is continuous with a front edge of the upper surface plate;
A carton comprising a non-metallic cutting blade attached to the front edge of the bottom plate,
A carton formed by bending the carton blank according to any one of claims 1 to 4 at a predetermined position. A method for producing a carton blank in which a sheet material and a non-metallic cutting blade are bonded by hot fusion of a hot melt adhesive,
Forming a surface coat layer containing a release agent on the surface of the sheet material excluding a part of the non-forming region;
A protective coating layer that does not contain a release agent and has adhesiveness with the hot melt adhesive and the surface coating layer is formed in the non-formation region of the surface of the sheet material along the edge of the region. ,
Overlaying the sheet material and the cutting blade through the hot melt adhesive in the non-formation region of the sheet material,
A method for producing a carton blank, comprising applying an ultrasonic wave to the hot melt adhesive to bond the sheet material and the cutting blade through the hot melt adhesive.   The carton blank manufacturing method according to claim 6, wherein the protective coating layer is not formed in a central portion of the sheet material in a region to which the hot melt adhesive is bonded.   The cutting blade is a long cutting blade having a cutting edge along the length direction, and the hot melt adhesive is disposed along the length direction of the cutting blade. Item 8. A method for producing a carton blank according to Item 6 or 7.   The carton blank manufacturing method according to any one of claims 6 to 8, wherein the cutting blade is made of a PLA resin sheet or a vulcanized fiber sheet having a moisture-proof coating formed on a surface thereof.

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