JP2013199295A - Wrap film storage box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wrap film storage box that can exhibits cutting performance even without a metal cutting tool such as a saw on the box to solve a safety problem such as cutting the hand, and a problem such that a paper-made box and a metal-made cutting tool have to be separated from each other when disposing.SOLUTION: A box for storing wound wrap film includes: a cuboid storage chamber formed of wall surfaces of a front plate (5), a bottom plate (4), a back plate (6), and side plates (3), and having an opening on the top; a lid plate (2) continued from an upper end edge of the back plate (6) in a direction of covering the opening of the storage chamber; and a covering lid piece (1) extending from a front end edge of the lid plate (2) in a direction of covering the front plate (5). The storage box has, on a part of the surface of the storage box, a coating film (7) formed of a coating composition containing 100 pts.mass of (I) a binder, and 1 to 150 pts.mass of (II) cellulose fiber.

Description

The present invention relates to a box that accommodates a wrapping film that is generally used for packaging foods in general households, food sales, food and beverage provision services, and the like. More specifically, the present invention relates to a storage box without a metal cutting tool such as a saw blade.

Conventionally, a wrap film is provided as a wound film stored in a rectangular box as shown in FIG. 1, for example, and a necessary amount is drawn from this, and cut in a lateral direction with respect to the length direction in some way, Provided for use. As a method of cutting horizontally, the most common method is to use a long metal saw blade provided on a box lid piece or the like of a box.

However, metal saw blades have safety problems such as injury to the hands, and paper boxes and metal saw blades must be separated at the time of disposal. To solve these problems In place of the saw blade, a file-like sheet bonded with a deformed metal powder is used as a cutting tool (Patent Document 1), or the wound film has a continuous processing flaw in its length direction. It has been proposed to provide a cutting aid such as a metal piece or vulcanized paper piece at the local area of the box that comes into contact (Patent Document 2). However, the above-mentioned safety problems and separation problems still remain.

In addition, a method has been proposed in which a film can be cut along a cut even in a box without a cutting tool such as a saw blade by forming cuts at regular intervals in the lateral end of the wound film (Patent Document 3). However, in a box in which the saw blades are simply removed from the conventional box, the film is not sufficiently cut. In addition, since a part of the box serves as a cutting tool, there is a problem that the part of the box is damaged before the wound film is used up and the film cannot be cut.

Japanese Patent Laid-Open No. 61-217345 Japanese Patent Laid-Open No. 11-124133 JP 2001-322636 A

The object of the present invention is to produce a practically satisfactory cut property even if there is no metal cutting tool such as a saw blade in the box containing the wound film, and to maintain the effect until the contained film is used up. It is possible to provide a wrap film storage box.

As a result of earnest research, the present inventor has provided a coating film made of a cellulose fiber-containing coating composition on the surface of the wrap film storage box, and the coating film serves as a cutting tool. It has been found that the film can be satisfactorily cut even without a metal cutting tool, and the above object can be achieved.

That is, this invention is a box which accommodates the wound wrap film, Comprising: It forms with each wall surface of a front plate (5), a bottom plate (4), a rear plate (6), and a side plate (3). A rectangular parallelepiped storage chamber having an open top, an openable / closable cover plate (2) connected in a direction covering the opening of the storage chamber from the upper edge of the rear plate (6), and a front edge of the cover plate (2) In a storage box having a lid piece (1) extending in a direction covering the front plate (5),
(I) A storage box having a coating film (7) made of a coating composition containing 100 parts by weight of a binder and (II) 1 to 150 parts by weight of cellulose fibers in a part of the surface of the storage box. is there.

The storage box of the present invention has a coating film made of a coating composition containing cellulose fibers, which functions as a cutting tool, so that the film can be cut well even without a metal cutting tool. Therefore, it is possible to avoid a safety problem such as injury to the hand and a problem that the paper box and the metal cutting tool must be separated at the time of disposal.

It is a perspective view explaining the storage box of this invention. It is a perspective view which shows an example of the storage box of this invention. It is a perspective view which shows another example of the storage box of this invention. It is a perspective view which shows another example of the storage box of this invention. It is the figure which photographed the surface of the film in which the knurling process was given. It is the figure which photographed the surface of the film in which the laser processing was given.

The wrap film storage box of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view illustrating a storage box according to the present invention. The storage box of the present invention includes a rectangular parallelepiped storage chamber having an open top and a rear plate formed by the respective wall surfaces of a front plate (5), a bottom plate (4), a rear plate (6) and a side plate (3). An openable and closable lid face plate (2) connected in a direction covering the opening of the storage chamber from the upper end edge of (6), and an eaves lid extending from the front end edge of the lid face plate (2) in a direction covering the front face plate (5) A coating film (7) comprising a coating composition (α) containing (I) 100 parts by mass of a binder and (II) 1 to 150 parts by mass of cellulose fibers. ).

In the storage box of the present invention, since the cellulose fibers of the coating film serve as abrasive grains and the entire coating film acts like a sandpaper, the coating film cuts the wrap film drawn from the storage box. Acts as a cutting tool. The place where the coating film is provided in the storage box is typically a place where the wrap film can easily come into contact with the storage box when the wrap film is pulled out, that is, all or one of the front end portions of the lid piece (1) of the storage box. And / or all or part of the upper end of the front plate (5) of the storage box and / or all or part of the lower end of the front plate (5). The example of the storage box of this invention which provided the coating film (7) is shown to FIGS. FIG. 2 shows a storage box having a coating film (7) over the entire tip of the lid cover piece (1), and FIG. 3 shows a storage box having the coating film (7) over the entire upper end of the front plate (5). FIG. 4 shows a storage box having a coating (7) over the entire lower end of the front plate (5). The coating film (7) may be provided not only on the outer surface of the storage box but also on the inner surface. For example, in the case of a storage box in which the leading edge of the lid piece (1) overlaps the lower edge of the front plate (5), a coating film is provided at the leading end of the back side (inner surface) of the lid piece (1). obtain. Therefore, in this specification, “the surface of the storage box” includes the outer surface and the inner surface of the storage box.

(I) Binder The binder (I) is a component capable of forming a continuous coating film interposed between cellulose fibers, and a binder resin commonly used in the paint field can be used. For example, acrylic, ethylene vinyl acetate, vinyl acetate, polyester, polyurethane, starch, natural rubber, epoxy resin, cellulose acetate, polyisobutylene, chloroprene rubber, styrene butadiene rubber, polyvinyl alcohol And polyvinyl pyrrolidone resins. These binder resins are preferably those that do not exhibit tackiness at a temperature of 80 ° C. or lower, preferably at a temperature of 80 ° C. or lower, after curing or drying, in consideration of the use environment and storage environment.

In addition, when the binder (I) is an active energy ray-curable resin composition, the inclusion property of the cellulose fibers and the interaction with the cellulose fibers are high, and the water resistance and oil resistance of the obtained coating film are excellent. In view of high hardness. This is because the active energy ray-curable resin composition contains a component having a functional group that generates a hydrogen bond with a hydroxyl group in the cellulose fiber or a functional group that reacts with the hydroxyl group, so that the interaction with the cellulose fiber is good. Moreover, it is because water resistance, oil resistance, and hardness become favorable by carrying out active energy ray hardening.

The active energy ray-curable resin composition can be polymerized and cured by active energy rays such as ultraviolet rays and electron beams to form a coating film. For example, containing (meth) acryloyl groups such as polyurethane (meth) acrylate, polyester (meth) acrylate, polyacryl (meth) acrylate, epoxy (meth) acrylate, polyalkylene glycol poly (meth) acrylate and polyether (meth) acrylate Prepolymer or oligomer; methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, isobornyl (meth) acrylate , Dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, phenyl (meth) acrylate, phenyl cellosolve (meth) acrylate, 2 Methoxyethyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, 2-acryloyloxyethyl hydrogen phthalate, dimethylaminoethyl (meth) acrylate, trifluoroethyl (meth) acrylate, trimethylsiloxyethyl methacrylate, etc. (Meth) acryloyl group-containing monofunctional reactive monomers; monofunctional reactive monomers such as N-vinylpyrrolidone and styrene; diethylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (Meth) acrylate, polyethylene glycol di (meth) acrylate, 2,2′-bis (4- (meth) acryloyloxypolyethyleneoxyphenyl) pro (2) -bis (4- (meth) acryloyloxypolypropyleneoxyphenyl) propane and other (meth) acryloyl group-containing bifunctional reactive monomers; trimethylolpropane tri (meth) acrylate and trimethylolethanetri (meth) ) (Meth) acryloyl group-containing trifunctional reactive monomers such as acrylate; (meth) acryloyl group-containing tetrafunctional reactive monomers such as pentaerythritol tetra (meth) acrylate; and (meth) acryloyl groups such as dipentaerythritol hexaacrylate Examples thereof include a composition containing one or more selected from a contained hexafunctional reactive monomer or the like, or a resin containing one or more of the above as a constituent monomer together with a photopolymerization initiator and / or a photosensitizer.

The active energy ray-curable resin composition is preferably one that is cured with ultraviolet rays because the production line can be simplified. In the case of curing with ultraviolet rays, the photopolymerization initiator is preferably selected from acetophenones, benzophenones, Michler benzoylbenzoate, α-amyloxime ester, tetramethylthiuram monosulfide, thioxanthone, and the like. The photosensitizer is preferably selected from n-butylamine, triethylamine, tri-n-butylphosphine and the like.

In addition, the binder (I) is
(A) The following formula (1):
(Where R1 and R2 are each a polyether (meth) acrylate residue having one or more (meth) acryloyloxy groups, and the number of (meth) acryloyloxy groups in R1 and (meth) acryloyloxy in R2 Ethanolamine-modified polyether (meth) acrylate having a total number of groups of 3 or more,
(B) a polyisocyanate having two or more isocyanate groups in one molecule, and (C) a photopolymerization initiator, the number of hydroxyl groups (a) in component (A) and the number of isocyanate groups in component (B) ( When the active energy ray-curable resin composition (T) has a ratio (a / b) with b) in the range of 0.5 to 1.2, the resulting coating film is used to provide a good film. In addition, the coating film has crack resistance, that is, there is no problem that the coating film is cracked and the coating film component is dropped off. Furthermore, the resulting coating film has the advantage of being resistant to aqueous and oily contaminants.

In the above formula (1), R1 and R2 are each a polyether (meth) acrylate residue having one or more (meth) acryloyloxy groups, and the number of (meth) acryloyloxy groups in R1 and (meth) ) The total number of acryloyloxy groups is 3 or more, preferably 3-9, more preferably 4. If the total is 2 or less, the durability of the resulting coating film as a cutting tool may not be sufficient. R1 and R2 may be the same or different from each other, but R1 and R2 are preferably the same.

Since the active energy ray-curable resin composition (T) has a very high curing rate, a coating composition can be obtained by directly applying and curing a coating composition (α) to which cellulose fibers are added to a storage box. it can. Also, the line speed of the step of forming a coating film is employed when the coating composition (α) is applied to a substrate such as paper and cured to form a coating film and then applied to a storage box. Therefore, the manufacturing cost can be reduced.

The component (A) functions to trap oxygen radicals. In general, when a (meth) acryloyloxy functional group-containing compound is cured by radical polymerization, the radical polymerizable compound is susceptible to polymerization inhibition by oxygen radicals in the air, and particularly on the surface of the coating film, a curing reaction is caused by oxygen radicals. Become slow. If the irradiation time of the active energy rays is increased so that the surface is sufficiently cured, the speed of the production line is reduced, and the influence of oxygen radicals is relatively small inside the coating film. Therefore, there is an increased risk of cracking when the coating film is used as a cutting tool. The active energy ray-curable resin composition (T) is not affected by oxygen radicals because the component (A) has the specific structure of the above formula (1), and therefore has a high curing reaction rate, and A coating film excellent in durability and crack resistance as a cutting tool can be obtained. Component (A) has an ethanolamine residue, a hydrogen is generated by extracting hydrogen of a methylene group adjacent to the nitrogen atom in the ethanolamine residue, and an oxygen radical is bound and trapped there. It is done.

Component (A) can be produced, for example, by reacting a compound represented by the following formula (3) and a compound represented by the following formula (4) with ethanolamine at room temperature. This reaction is highly active at room temperature and does not require a catalyst. In order to prevent gelation, it is preferable to add a solvent or the like to lower the apparent concentration.
R1-O-C (= O ) -CH = CH 2 (3)
R2-O-C (= O ) -CH = CH 2 (4)
Here, R1 and R2 are as defined above.

In addition, when the component (A) is produced by the above method, many kinds of side reaction products are generated in addition to the target component (A) which is the main product. Usually, these by-products are used.

As the compounds represented by the above formulas (3) and (4), for example, TPGDA (trade name) (tripropylene glycol diacrylate) and OTA 480 (trade name) (glycerin propoxytriacrylate) manufactured by Daicel-Cytec Corporation, In addition, dipentaerythritol hexaacrylate manufactured by Nippon Kayaku Co., Ltd. may be mentioned.

The OTA480 is a compound having the following formula (5).

Particularly preferred as the component (A) is a compound having the following formula (2).
When the component (A) is a compound having the above formula (2), the resulting composition has a very good balance of storage stability, durability and crack resistance.

Component (B) is a compound having two or more isocyanate groups (—N═C═O) in one molecule. Specifically, methylene bis-4-cyclohexyl isocyanate, trimethylol propane adduct of tolylene diisocyanate, trimethylol propane adduct of hexamethylene diisocyanate, trimethylol propane adduct of isophorone diisocyanate, isocyanurate of tolylene diisocyanate, hexa Examples thereof include polyisocyanates such as isocyanurate of methylene diisocyanate, isocyanurate of isophorone diisocyanate and biuret of hexamethylene diisocyanate, and urethane crosslinking agents such as block type isocyanates of the above polyisocyanate. Further, at the time of crosslinking, a catalyst such as dibutyltin dilaurate and dibutyltin diethylhexoate may be added as necessary.

Among these, those having three or more isocyanate groups in one molecule are preferred from the viewpoint of crack resistance of the coating film and storage stability of the paint, and in particular, hexamethylene represented by the following formula (6) A diisocyanate trimer having an isocyanate ring structure, or a hexamethylene diisocyanate trimer represented by the following formula (7) and a trimethylolpropane adduct may be suitably used. . These have a structural feature that isocyanate groups are present at positions away from each other at the end of the hexamethylene chain. Therefore, the obtained coating film has elasticity and excellent crack resistance.

The active energy ray-curable resin composition (T) is cured by a reaction between the hydroxyl group in the component (A) and the isocyanate group in the component (B). This active energy ray-curable resin composition (T) has a ratio (a) of the number of hydroxyl groups (a) of component (A) to the number of isocyanate groups (b) of component (B) so that curing can be sufficiently caused. / B) is in the range of 0.5 to 1.2, preferably 0.7 to 1.1. When the ratio is less than the lower limit, the resulting coating film may not have sufficient crack resistance. When the above ratio is larger than the above upper limit, the resulting coating film has insufficient stain resistance against aqueous contaminants such as gravy, and is not sufficiently satisfactory as a storage box for food packaging wrap films. Sometimes.

In the present specification, the number of hydroxyl groups per unit amount of component (A) was determined based on JIS-K-1557-1: 2007. That is, after the hydroxyl group of component (A) is acetylated with an acetylating reagent (acetic anhydride in pyridine), excess acetylating reagent is hydrolyzed with water, and the resulting acetic acid is titrated automatically by Kyoto Denshi Kogyo Co., Ltd. The above number was determined by titration with an ethanol solution of potassium hydroxide using an apparatus AT-610 type. The number of isocyanate groups per unit amount of component (B) was determined based on JIS-K-7301: 1995. That is, after reacting the isocyanate group of component (B) with dinormal butylamine, the excess dinormal butylamine is titrated with an aqueous hydrochloric acid solution using an automatic potentiometric titrator AT-610 model of Kyoto Electronics Industry Co., Ltd. The above number was determined.

Component (C) is a radical polymerization type photopolymerization initiator, and known ones can be used. For example, triazine compounds, acetophenone compounds, biimidazole compounds, benzoin compounds, benzophenone compounds, thioxanthone compounds, anthracene compounds, alkylphenone compounds, acylphosphine oxide compounds, titanocene compounds, oxime ester compounds And photopolymerization initiators such as oxime phenylacetate compounds, hydroxyketone compounds and aminobenzoate compounds. These can be used alone or in combination of two or more. Among these, benzophenone compounds are preferable because the reaction mechanism is a radical-generating type by hydrogen abstraction. Specifically, benzophenone, methyl-o-benzoylbenzoate, 4-methylbenzophenone, 4,4′-bis ( Diethylamino) benzophenone, methyl o-benzoylbenzoate, 4-phenylbenzophenone, 4-benzoyl-4′-methyldiphenyl sulfide, 3,3 ′, 4,4′-tetra (tert-butylperoxycarbonyl) benzophenone and 2, Examples include 4,6-trimethylbenzophenone.

The compounding quantity of a component (C) can be suitably selected with the kind of other component and desired coating-film thickness, Generally, about 0.5-10 mass parts with respect to 100 mass parts of component (A). It is. For example, when the component (A) is a compound of the above formula (2), the component (B) is a compound of the above formula (6), and the component (C) is benzophenone, the coating thickness is less than 30 μm. In the case, the amount of the component (C) is 4 to 10 parts by mass with respect to 100 parts by mass of the component (A), and when the coating film thickness is 30 μm or more, the amount is 100 parts by mass of the component (A). 0.5 to 8 parts by mass. The reason why the amount of the component (C) is generally larger when the thickness of the coating film is thinner is that the thinner the film, the more easily the influence of curing inhibition by oxygen radicals occurs.

In addition, the binder (I) is practically completely free of components transferred to the wrap film after being cured, or scraped off, but directly contacts a part of the wrap film for food packaging. Therefore, a material that conforms to the ROHS directive is preferable.

(II) Cellulose fiber Cellulose fiber is a polysaccharide in which D-glucose is linked by β-1,4-glucoside, and is usually obtained from cotton, hemp, woody plant, etc., and is called pulp. Sometimes. The cellulose fiber (II) used in the present invention is used as a kind of abrasive grains, and may be either mechanical pulp or chemical pulp. In order to increase the miscibility with the binder (I) and thus improve the crack resistance of the coating film, a high-purity chemical pulp is preferred. What chemically modified all or one part of the hydroxyl group of the glucose residue of a cellulose fiber can also be used. Examples of the chemical modification include acetylation, methylation, ethylation, and carboxymethylation. Cellulose fibers (II) are preferably those listed in the Japanese Pharmacopoeia Part 2 as pharmaceutical additives and those designated as food additives from the viewpoint of food safety, such as carboxymethylcellulose. Examples thereof include calcium, sodium carboxymethylcellulose, methylcellulose, hydroxypropylmethylcellulose, and hydroxypropylcellulose.

The cellulose fiber in the present invention is used as a kind of abrasive grains, and preferably has no fear of detachment due to fiber breakage. Considering these, the average particle diameter of the cellulose fibers is preferably 10 to 100 μm, more preferably 20 to 60 μm. In the present specification, the average particle size of the cellulose fiber (II) is small in the particle size distribution curve measured using a laser diffraction / scattering particle size analyzer MT3200II (trade name) manufactured by Nikkiso Co., Ltd. The particle diameter is cumulative from 50% by mass.

Cellulose fibers are softer than alumina (aluminum oxide), silicon carbide, boron nitride, and the like that are used as ordinary sanding abrasive grains, and therefore, the resulting coating film is used to cut the wrap film. There is virtually no chance of injury.

The blending amount of the cellulose fiber (II) is usually at least 1 part by mass, preferably at least 2 parts by mass with respect to 100 parts by mass of the binder (I). When less than this, the obtained coating film may not exhibit an effect as a cutting tool. In consideration of the cellulose fiber inclusion performance of the binder (I), the upper limit is 150 parts by mass, preferably 100 parts by mass.

Moreover, it is advantageous to reduce the compounding quantity of cellulose fiber (II), so that the average particle diameter of a cellulose fiber is large from the point of the crack resistance of the coating film obtained, and stain resistance. For example, when an average particle diameter is 50 micrometers, 2-20 mass parts is preferable with respect to 100 mass parts of binder (I), More preferably, it is 3-15 mass parts, More preferably, it is 3-10 mass parts. When the average particle diameter is 37 μm, 5 to 30 parts by weight is preferable with respect to 100 parts by weight of the binder (I). When the average particle diameter is 30 μm, 10 to 60 parts by weight is preferable and the average particle diameter is 24 μm. In this case, 20 to 100 parts by mass is preferable.

The coating composition (α) containing the above (I) and (II) may contain a solvent as necessary for dilution. For example, when an active energy ray-curable resin composition is used as the binder (I), the solvent is compatible with each component of the active energy ray-curable resin composition, and these components and cellulose fibers are used. As long as it does not react with or catalyze the self-reaction of these components, it is not particularly limited. For example, known materials such as 1-methoxy-2-propanol, n-butyl acetate, toluene and methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate and diacetone alcohol can be used. The amount of the solvent can be appropriately adjusted so as to have a suitable viscosity according to the coating apparatus and the thickness of the coating film. Usually, for example, in the case where the binder (I) is the active energy ray-curable resin composition (T) containing the above components (A) to (C), 150 to 250 parts per 100 parts by mass of the component (A). Part by mass.

The coating composition (α) is an antioxidant, a weather resistance stabilizer, a light resistance stabilizer, an ultraviolet absorber, a heat stabilizer, an antistatic agent, a surfactant, and a colorant as long as the effects of the present invention are not impaired. , An infrared shielding agent, a leveling agent, a thixotropic agent, and one or more additives such as fillers other than cellulose fibers may be included.

The coating composition (α) is obtained by mixing and stirring the above (I) and (II) and optional components.

As a method of providing a coating film made of the coating composition (α) in the storage box, a method of directly applying the coating composition (α) to the lid cover piece (1) of the storage box, a coating composition (α) is made of paper, etc. A method of applying a coating film or a laminate of a substrate and a coating film to the lid lid piece (1) of the storage box through an adhesive or the like after coating the surface of the base material to form a coating film Etc. The method for applying the coating composition (α) is not particularly limited, and a known application method can be used. Specific examples include roll coating, gravure coating, reverse coating, roll brushing, spray coating, air knife coating, and die coating. Since cellulose fibers are softer than alumina (aluminum oxide), silicon carbide, boron nitride and the like used for ordinary sandpaper abrasive grains, the coating composition (α) containing cellulose fibers is applied. At this time, there is no problem that the gravure roll or doctor blade of the coating machine is worn.

The thickness of the coating film is not particularly limited, but may be the same thickness as ordinary sandpaper. The distance between the coating surface in the box (the coating surface on the base material when the coating film includes a base material such as paper) and the peak of the convexity on the coating film surface is usually 10 to 2000 μm. Degree.

The storage box of the present invention can be made using paper usually used for storing wrap films, such as coated cardboard having a basis weight of 400 to 500 g / m ² . If the basis weight of the paper is small, a problem in durability tends to occur, and if it is large, the cost is high. Accordingly, the basis weight of the paper is appropriately selected in consideration of the durability required from the length of the film roll to be stored.

Furthermore, the storage box of the present invention reinforces them by attaching a paper reinforcing plate to the lid piece, the front plate and the cover plate from the viewpoint of durability, and preferably from the aesthetic point to the back surface thereof. It is preferable. The reinforcement of the lid pieces and the front plate directly improves their durability. The reinforcement of the cover plate increases the torsional rigidity of the entire box, and thus improves the durability of the entire box. As the paper reinforcing plate, the same paper as that constituting the storage box can be used. The reinforcing plate can be prepared separately from the storage box and attached to the back surface. Alternatively, for example, the reinforcing plate can be integrally attached to the front end edge of the lid cover piece, and the reinforcing plate can be reinforced by folding it back to the back side at the front end edge.

The storage box of the present invention is used for a wrap film and has any mechanical strength useful as a wrap film, for example, any wrap film such as polyvinylidene chloride, polyvinyl chloride, polyethylene, polymethylpentene-1 and polyamide. The present invention can be applied to a single-layer or multi-layer film made of a resin selected from the group having a total thickness of 3 to 30 μm, typically about 8 to 15 μm. As said mechanical strength, it is preferable that the tensile breaking force of the length direction of a wrap film and a horizontal direction is 1-15N, More preferably, it is 1-10N. In the present specification, the tensile breaking force is a value measured using a test speed of 500 mm / min and a test piece type 2 in accordance with JISK-7127.

In addition, the storage box of the present invention is particularly useful for storing a wrap film having excellent cross-cutting properties. An example of such a film is a film obtained by the method described in Japanese Patent Application No. 2010-275113. This film comprises (a) 100 parts by mass of polymethylpentene-1 resin, and (b) 0.5 to 60 parts by mass of polybutene-1 resin, preferably 1 to 25 parts by mass, and / or liquid paraffin 0.1. To 20 parts by weight, preferably 1 to 12 parts by weight, provided that the total amount of components (b) does not exceed 75 parts by weight, preferably 0.6 to 75 parts by weight, more preferably 2 to 35 parts by weight, even more preferably. A polymethylpentene-1-based resin composition containing 3 to 25 parts by mass can be produced by extruding to a film thickness of 3 to 30 μm using a T die. At this time, the extrusion is performed by using the lip opening R of the T die (unit: μm), the film thickness t (unit: μm), and the discharge speed E (unit: cm ³ / hr) per 1 cm of the die width of the resin composition extruded from the die. ) And air gap A (unit: cm) are represented by the following formula:
15 ≦ (1 / t − 1 / R) · (E / At ) × 100 ≦ 900... It is preferable that the conditions are satisfied. Preferably, t is 5 to 20 μm, more preferably 8 to 15 μm, A is 0.5 to 2 cm, E is 100 cm ³ / hr or more, and R is about 300 to 900 μm.

The above formula is performed under conditions where the film deformation speed until the molten film exiting the die reaches the chill roll and becomes the final size film is high in extrusion film formation using a T die. This means that the melted film is drawn down large and fast in the air gap from the die to the chill roll.

The polymethylpentene-1 resin (I) includes 4-methylpentene-1 and / or 3-methylpentene-1 in addition to a homopolymer of 4-methylpentene-1 or 3-methylpentene-1. Copolymers with other α-olefins are included. The α-olefin may be used alone or in combination of two or more. Examples of the α-olefin include ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene and the like.

The polybutene-1 resin as the component (b) includes a copolymer of butene-1 and another α-olefin in addition to the homopolymer of butene-1. The α-olefin may be used alone or in combination of two or more. Examples of the α-olefin include ethylene, propylene, 1-hexene, 1-octene, 1-decene, 1-dodecene and the like. The above fluid paraffin is a liquid, chemically stable substance mainly composed of a chain saturated hydrocarbon, and commercially available examples (trade names) include Daphne Oil CP of Idemitsu Kosan Co., Ltd. and MORESCO Co., Ltd. Examples include Sco White and Kaneda Corporation's High Call K.

The polymethylpentene-1 resin composition further includes a liquid processing aid such as a thermoplastic resin other than the polymethylpentene-1 resin (eg, polypropylene and polyethylene), liquid polybutene (hydrogenated polyisobutylene), Additives such as an antioxidant, a neutralizing agent, an antifogging agent, and a slipping agent can be blended. The total amount of the thermoplastic resin and the liquid processing aid is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, with respect to 100 parts by mass of the polymethylpentene-1 resin.

Further, if the wrap film stored in the storage box of the present invention can be cut with a smaller force, the load applied to the storage box can be reduced, and as a result, better cutability can be obtained until the stored film is used up. Can be maintained. As a method for enabling cutting with a smaller force, the film may be provided with some trigger for cutting, and specifically, at least one of the lateral ends of the film, for example, 0. Knurling or laser processing can be performed with a width of 1 to 10 mm.

Knurling is performed by sandwiching the film between a metal engraving roll and a metal or high hardness rubber engraving roll or a smooth roll, or by pressing the engraving roll against a roll of film. It is a process to scratch. The processing conditions should be appropriately selected depending on the material of the film, but the pressing is usually about 10 to 50 N / m. FIG. 5 shows a photograph of the film surface that has been knurled. The knurling process can be performed by forming an independent process at the time of raw film formation, at the time of slit process, or after the slit process. The knurling is applied to at least one of the lateral ends of the film, but is preferably applied to both ends so that the film can be cut from either side. The processing width is usually 0.1 to 10 mm, preferably 0.3 to 6 mm.

Laser processing is processing in which a film is melted in a very fine region by laser irradiation heat and a concave shape or a hole is provided there. The laser to be used is not particularly limited. For example, gas lasers such as carbon dioxide laser, helium neon laser, argon ion laser and excimer laser, ruby laser using chromium-added ruby crystal as medium, titanium sapphire laser using titanium-added sapphire crystal as medium, and YAG crystal Solid state lasers such as various YAG lasers obtained by substituting yttrium with other rare earth elements and Nd: YAG lasers using neodymium-added YAG. Moreover, well-known lasers, such as a liquid laser, a semiconductor laser, a free electron laser, a metal vapor laser, a chemical laser, can be used. The irradiation output is about 0.5 to 20 W, and is appropriately adjusted in consideration of the thickness of the film and the processing speed. FIG. 6 shows a photograph of the film surface subjected to laser processing. Laser processing can be performed by forming an independent process during raw film formation, during slit processing, or after slit processing. Laser processing is applied to at least one of the lateral ends of the film, but it is more preferable to apply the processing to both ends so that the film can be cut from either side. The processing width is usually 0.1 to 10 mm, preferably 0.3 to 6 mm.

In addition, when knurling or laser processing is performed, it is possible to obtain a trouble preventing effect that the drawn end of the wound film is in close contact with the winding body and cannot be pulled out.

EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention is not limited to this.

material
(I) Binder
(A) Ethanolamine modified polyether (meth) acrylate
Synthesis example 1
Daicel Cytec Co., Ltd. OTA480 (product name, glycerin propoxytriacrylate of the above formula (5)) and 2-aminoethanol were charged into a glass beaker in an amount of 1 mol of the latter to 2 mol of the former, Reaction was carried out at a temperature of 23 ° C. for 72 hours to obtain an ethanolamine-modified polyether acrylate (A-1) having four acryloyloxy groups having the structure of the above formula (2). The number of hydroxyl groups per unit amount of component (A-1) was 1.09 mol / kg as measured by the method described above.

Synthesis example 2
In Synthesis Example 1, two samples were used in the same manner as in Synthesis Example 1 except that tripropylene glycol diacrylate (manufactured by Daicel-Cytec) was used instead of OTA480 (manufactured by Daicel-Cytec). An ethanolamine-modified polyether acrylate (A-2) having an acryloyloxy group was synthesized. The number of hydroxyl groups per unit amount of component (A-2) was 1.51 mol / kg.

(B) Polyisocyanate (B-1) Coronate HX manufactured by Nippon Polyurethane Industry Co., Ltd. (trade name, polyisocyanate of the above formula (6), number of isocyanate groups per unit amount: 5.12 mol / kg)
(B-2) Sumidur HT of Sumika Bayer Urethane Co., Ltd. (trade name, polyisocyanate of formula (7) above, number of isocyanate groups per unit amount: 3.10 mol / kg)

(C) Photopolymerization initiator (C-1) Benzophenone

(II) Cellulose fiber (II-1) KC Flock W-50S manufactured by Nippon Paper Chemical Co., Ltd. (trade name, high purity chemical pulp, average particle size 50 μm)
(II-2) Sunrose SLD-F1 manufactured by Nippon Paper Chemicals Co., Ltd. (trade name, sodium carboxymethyl cellulose, average particle size 55 μm)
(II-3) KC Flock W-100GK manufactured by Nippon Paper Chemical Co., Ltd. (trade name, high-purity chemical pulp, average particle size 37 μm)
(II-4) KC Flock W-250 manufactured by Nippon Paper Chemical Co., Ltd. (trade name, high-purity chemical pulp, average particle size 30 μm)
(II-5) KC Flock W-400G manufactured by Nippon Paper Chemical Co., Ltd. (trade name, high-purity chemical pulp, average particle size 24 μm)

Example 1
100 parts by mass of (A-1) as binder (I), 25 parts by mass of (B-1) and 7 parts by mass of (C-1), and (II-1) 7 as cellulose fiber (II) 200 parts by mass of 1-methoxy-2-propanol as a solvent and 200 parts by mass of a solvent are mixed and stirred together with 0.3 parts by mass of an anti-fogging agent (Polyflow 75 (trade name) manufactured by Kyoeisha Co., Ltd.). Thus, a coating composition (α) was obtained. The number of isocyanate groups per unit amount of (B-1) was 5.12 mol / kg as measured by the method described above. Therefore, the ratio (a / b) of the number of hydroxyl groups (a) in 100 parts by mass of component (A-1) and the number of isocyanate groups (b) in 25 parts by mass of component (B-1) is 1.09 × 100. /(5.12×25)=109/128=0.85.

The coating composition (α) obtained above was applied to one side of A4 size PPC paper (Ribbon Standard (trade name) from Nippon Paper Industries Co., Ltd.) using a Baker type applicator manufactured by Yasuda Seiki Co., Ltd. It dried for 24 hours with the ventilation dryer set to 30 degreeC, it was made to harden | cure by ultraviolet irradiation, and the laminated body which has a coating film was obtained. The coating thickness after curing was 25 μm.

The laminate obtained above was cut into a size of 5 mm × 30 mm, and the side opposite to the side having the coating film was used as the glued side, and double-sided adhesive tape (TERAOKATAPE No. 777 (trade name) from Teraoka Seisakusho Co., Ltd.) 1 is attached to the tip of the lid piece (1) of the storage box having the shape shown in FIG. 1 (coated cardboard with a basis weight of 450 g / m ² , 45 mm × 45 mm × 310 mm, and a reinforcing plate on the back side of the lid piece). A storage box having a coating film was obtained (see FIG. 2). In the storage box thus obtained, a wound wrap film (a film having a width of 300 mm and a length of 50 m is wound around a paper tube having a width of 305 mm, an inner diameter of 27 mm, and a thickness of 1.5 mm) is stored. Tests (1) to (3) were performed. The results are shown in Table 1. In addition, the following tests (4) to (6) were performed on the laminate obtained above in order to evaluate crack resistance and stain resistance as a more advantageous effect of the coating film. These results are also shown in Table 1.

In addition, as said wrap film, 4-methylpentene-1 (Mitsui Chemicals Co., Ltd. MX-0020 (brand name), MFR (260 degreeC, 5.00 kg) 21g / 10min) 100 mass parts, polybutene-1 ( It consists of 3 parts by mass of PB8640M (trade name) manufactured by LYONDELLBASEL, 3 parts by mass of MFR (190 ° C., 21.18N) 28 g / 10 min, and 5 parts by mass of liquid paraffin (Hicall K-350 (trade name) manufactured by Kaneda Corporation). What used the resin composition which performed the rotlet process to the both ends of the horizontal direction of the 12-micrometer-thick film formed into a film using the T-die film-forming apparatus by Nippon Steel, Ltd. was used. The film was formed under the conditions of a lip opening of 400 μm, an air gap of 1.5 cm, a discharge speed of 712 cm ³ / hr, a chill roll temperature of 25 ° C. and a die outlet resin temperature of 290 ° C., and a vacuum chamber and an ear jet were used. The knurl processing was performed under processing conditions of a presser foot amount of 0.2 mm, a processing width of 0.6 mm, and a processing speed of 400 m / min. The tensile breaking force in the longitudinal direction and the transverse direction of this film was 5.4 N and 2.9 N, respectively.

Comparative Example 1
As shown in FIG. 1, the test was conducted in the same manner as in Example 1 except that the storage box had no coating film. The results are shown in Table 1.

Example 2
As shown in FIG. 3, the test was conducted in the same manner as in Example 1 except that the storage box had the coating film (7) at the upper end of the front plate (5). The results are shown in Table 1.

Example 3
As shown in FIG. 4, the test was conducted in the same manner as in Example 1 except that the storage box had the coating film (7) at the lower end of the front plate (5). The results are shown in Table 1.

Example 4
The test was conducted in the same manner as in Example 1 except that the above (II-2) was used as the cellulose fiber. The results are shown in Table 1.

Examples 5 to 9 and Comparative Example 2
The test was performed in the same manner as in Example 1 except that the amount of (II-1) was changed as shown in Table 1. The results are shown in Table 1.

Example 10
As a component (B), Sumidur HT of Sumika Bayer Urethane Co., Ltd. (trade name, polyisocyanate of the above formula (7), number of isocyanate groups per unit amount: 3.10 mol / kg) (B-2) The test was conducted in the same manner as in Example 1 except that 42 was used in an amount of 42 parts by mass. The results are shown in Table 2.

Examples 11-16
The test was performed in the same manner as in Example 1 except that the amount of (B-1) was changed as shown in Table 2. The results are shown in Table 2.

Example 17
The test was conducted in the same manner as in Example 14 except that the component (A-2) obtained in Synthesis Example 2 was used as the component (A). The results are shown in Table 2.

Example 18
In Example 1, tripropylene glycol diacrylate (manufactured by Daicel Cytec Co., Ltd., number of hydroxyl groups per unit amount: 0 mol / kg) (A-3) was used as component (A), and as component (C) , Alkylphenone photopolymerization initiator (Darocur 1173 (trade name), 2-hydroxy-2-methyl-1-phenyl-propan-1-one) (C-2) (C-2) of Ciba Japan Co., Ltd. The test was conducted in the same manner as in Example 1 except that the amount was used. The reason why the benzophenone (C-1) was not used as the component (C) is that when the component (A) is the above (A-3), the curing rate is slow in the above (C-1). The component (C-2) was used as the component (C) so that the curing of the component (A-3) and the component (B-1) proceeded at a high speed without gelation. The same applies to Examples 19 and 20 below. The amount of component (C) is 5 parts by mass because 7 parts by mass is too large and gelation occurs. The results are shown in Table 2.

Example 19
In Example 1, dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Co., Ltd., number of hydroxyl groups per unit amount: 0.63 mol / kg) (A-4) was used as component (A), and The test was performed in the same manner as in Example 1 except that the amount of (B-1) was changed so that the ratio (a / b) was 0.85. The results are shown in Table 2. In addition, the above (A-4) does not have a hydroxyl group in terms of structure, but a hydroxyl group exists because a part of the acryloyloxy group is hydrolyzed. The same applies to (A-5) in Example 20 below.

Example 20
In Example 1, ditrimethylolpropane tetraacrylate (manufactured by Nippon Kayaku Co., Ltd., number of hydroxyl groups per unit amount: 0.35 mol / kg) (A-5) was used as the component (A), and The test was performed in the same manner as in Example 1 except that the amount of (B-1) was changed so that the ratio (a / b) was 0.85. The results are shown in Table 2.

Example 21
KC Flock W-100GK (trade name, high-purity chemical pulp, average particle size 37 μm) (II-3) manufactured by Nippon Paper Chemical Co., Ltd. was used as component (II), and the blending amount was 30 parts by mass. The test was conducted in the same manner as in Example 1 except for the above. The results are shown in Table 3.
Example 22
In Example 21, the test was performed in the same manner as in Example 21 except that the blending amount of (II-3) was 7 parts by mass. The results are shown in Table 3.

Example 23
KC Flock W-250 (trade name, high-purity chemical pulp, average particle size 30 μm) (II-4) manufactured by Nippon Paper Chemical Co., Ltd. was used as component (II), and the blending amount was 75 parts by mass. The test was conducted in the same manner as in Example 1 except for the above. The results are shown in Table 3.

Example 24
In Example 23, the test was performed in the same manner as in Example 23 except that the blending amount of (II-4) was 15 parts by mass. The results are shown in Table 3.

Example 25
KC Flock W-400G (trade name, high-purity chemical pulp, average particle size 24 μm) (II-5) manufactured by Nippon Paper Chemical Co., Ltd. was used as component (II), and the blending amount was 120 parts by mass. The test was conducted in the same manner as in Example 1 except for the above. The results are shown in Table 3.

Example 26
In Example 25, a test was performed in the same manner as in Example 25 except that the amount of (II-5) was 30 parts by mass. The results are shown in Table 3.

Example 27
As binder (I), vinyl acetate resin emulsion-based woodworking bond CH2N (trade name, solid content: 45.5% by mass) manufactured by Konishi Co., Ltd. is used as 100 parts by mass, and cellulose fiber (II) as described above (II) Using 5 parts by mass of -1), these were mixed and stirred to obtain a coating composition (α). The coating composition obtained above was applied to one side of A4 size PPC paper (Ribbon Standard (trade name) from Nippon Paper Industries Co., Ltd.) using a Baker type applicator manufactured by Yasuda Seiki Co., Ltd. It dried for 24 hours with the set ventilation dryer, and obtained the laminated body which has a coating film. The coating thickness after drying was 25 μm. Using the obtained laminate, a storage box was produced in the same manner as in Example 1 and tested. The results are shown in Table 3.

Test method (1) Cutability test Pull out the stored wrap film about 40cm from the storage box, close the lid, and try the test to cut the film 10 times using the coating film of the storage box, and cut the number of times that can be cut Expressed as a percentage (%). In addition, about the comparative example 1, it cut | disconnected the film using the front-end | tip part of the lid piece instead of the coating film.

(2) Durability test After the same cutting as in (1) was attempted 100 times, another 10 cuttings were attempted, and the number of times that cutting was possible in these 10 trials was expressed as a cutting rate (%).

(3) Diagonal cut test After the stored wrap film is pulled out about 40 cm from the storage box, the lid is closed with the hand gripping the film being pulled 30 degrees toward the width of the storage box. Tried the test of cutting the film ten times in the same manner as in the above test (1), and the number of times the film could be cut was expressed as the cutting rate (%).

(4) Crack resistance The laminate obtained above was cut into a size of 100 mm x 50 mm, and this was cut into a double-sided tape No. 2 manufactured by Nitto Denko. Using 500 A, a test piece was prepared by adhering to an aluminum plate having a thickness of 0.3 mm so that the coating film surface was the surface. Using a JIS K 5600-5-1 type 1 bending test apparatus to which a mandrel having a diameter of 2 mm is attached, the test piece is turned to 180 ° at an even speed over 2 seconds so that the coating surface is on the outside. Bent. After the end of bending, the presence or absence of cracks in the coating film was confirmed for the central 30 mm portion of the bent portion, and evaluated according to the following criteria.
◎: No crack ○: One crack Δ: Two to three cracks ×: Four or more cracks

(5) Stain resistance-1
After the surface of the coating film of the laminate obtained above was spot-contaminated with oily red magic, the contaminated part was covered with a watch glass and left at room temperature for 24 hours. Subsequently, the contaminated portion was cleaned by wiping until the wiping of the kimwipe was completely removed using a Kimwipe (trade name) sufficiently containing isopropyl alcohol, and the above portion was visually observed and evaluated according to the following criteria. .
◎: No contamination ○: Slight contamination remains △: Contamination remains significantly ×: Contamination remains significantly

(6) Pollution resistance-2
After the surface of the coating film of the laminate obtained above was spot-contaminated with aqueous red magic, the contaminated part was covered with a watch glass and allowed to stand at room temperature for 24 hours. Next, after thoroughly washing the contaminated part with running water, using a Kimwipe (trade name) sufficiently containing tap water, wiping and cleaning until the Kimwipe is no longer dirty, and then visually observing the above part. The evaluation was based on the following criteria.
◎: No contamination ○: Slight contamination remains △: Contamination remains significantly ×: Contamination remains significantly

As is clear from Tables 1 to 3, the storage box of the present invention having a coating film made of the coating composition (α) can cut the stored food packaging wrap film well.

1: Cover piece 2: Cover plate 3: Side plate 4: Bottom plate 5: Front plate 6: Rear plate 7: Coating film

Claims (7)

A box for storing a wound wrap film, which is formed by the wall surfaces of a front plate (5), a bottom plate (4), a rear plate (6), and a side plate (3), with an open top. The opening and closing cover face plate (2) connected in the direction covering the opening of the storage room from the upper end edge of the rear face plate (6), and the front face plate (5) from the front end edge of the cover face plate (2) In the storage box having the lid piece (1) extending in the covering direction,
(I) A storage box comprising a coating film (7) made of a coating composition containing 100 parts by weight of a binder and (II) 1 to 150 parts by weight of cellulose fibers in a part of the surface of the storage box. The storage box according to claim 1, wherein the binder (I) is an active energy ray-curable resin composition. Binder (I)
(A) The following formula (1):
(Where R1 and R2 are each a polyether (meth) acrylate residue having one or more (meth) acryloyloxy groups, and the number of (meth) acryloyloxy groups in R1 and (meth) acryloyloxy in R2 Ethanolamine-modified polyether (meth) acrylate having a total number of groups of 3 or more,
(B) a polyisocyanate having two or more isocyanate groups in one molecule, and (C) a photopolymerization initiator,
Active energy rays in which the ratio (a / b) of the number of hydroxyl groups (a) of component (A) to the number of isocyanate groups (b) of component (B) is in the range of 0.5 to 1.2 The storage box according to claim 2, wherein the storage box is a curable resin composition. The cellulose fiber (II) is selected from those listed in the Japanese Pharmacopoeia Part 2 as a pharmaceutical additive and those designated as a food additive. The storage box according to Item 1. All or part of the tip of the lid piece (1) of the storage box and / or all or part of the upper end of the front plate (5) of the storage box and / or the lower end of the front plate (5) of the storage box The storage box according to any one of claims 1 to 4, wherein the coating film is provided on all or a part of the part. The wrap film product which accommodated the wound wrap film in the storage box of any one of Claims 1-5. The wrap film product according to claim 6, wherein knurling and / or laser processing having a width of 0.1 to 10 mm is applied to at least one of the lateral ends of the wrap film.