JP2021127179A - Wrap film wound body - Google Patents

Abstract

To provide a wrap film wound body which enables quality deterioration of a wrap film to be suppressed.SOLUTION: The wrap film wound body comprises: a wrap film 10; and a paper tube 20 on which the wrap film 10 is wound. Dry thermal shrinkage of the wrap film 10 placed still at 95°C for 5 minutes is 10%-25% in an MD direction, and 5%-15% in a TD direction. The paper tube 20 has a cylindrical shape with a paper tape 21 wound thereon, and arithmetic average roughness Ra on the outer peripheral surface 20S of the paper tube 20 is equal to or less than 1.9 μm.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wrap film wound body in which a wrap film is wound around a paper tube.

A wrap film containing a polyvinylidene chloride resin or a polyvinylidene chloride / vinyl chloride copolymer as a main component is used in a state of being wrapped around a paper tube. The outer peripheral surface of the paper tube on which the wrap film is wound is composed of the paper tape wound in a spiral or flat winding shape, and has irregularities derived from the surface of the paper tape. The unevenness of the outer peripheral surface of the paper tube may distort, wrinkle, and scratch the wrap film, and may deteriorate the quality of the wrap film. This phenomenon is the same for films other than wrap films. Therefore, in order to suppress the deterioration of the quality of the film, it has been proposed that the arithmetic average roughness Ra of the outer peripheral surface of the paper tube is 2.0 μm or less (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2004-83147

The shrinkable wrap film shrinks in the circumferential direction of the paper tube while it is stored in a state of being wrapped around the paper tube. That is, the shrinkable wrap film causes so-called tightening. In the wrap film in which the winding is tightened, the unevenness on the outer peripheral surface of the paper tube is easily transferred, and uneven marks are formed on the wrap film to the extent that the aesthetic appearance and the adhesive force are deteriorated.

An object of the present invention is to provide a wrap film wound body capable of suppressing deterioration of aesthetics and adhesion in the wrap film.

The wrap film winding body for solving the above problems includes a wrap film and a paper tube around which the wrap film is wound. The dry heat shrinkage of the wrap film when allowed to stand at 95 ° C. for 5 minutes is 10% or more and 25% or less in the MD direction and 5% or more and 15% or less in the TD direction, and the paper tube is made of paper tape. The paper tube has a cylindrical shape in which the paper tape is wound, and the arithmetic average roughness Ra on the outer peripheral surface of the paper tube is 1.9 μm or less. Provided a pair of edge portions extending in the extending direction of the paper tape, and the pair of edge portions is composed of a spiral first edge portion and a spiral second edge portion, and on the outer peripheral surface, n The first edge of the winding (n is an integer of 1 or more) overlaps the second edge of the n + 1 winding, and the width of the overlap between the first edge and the second edge is It is larger than 0 mm and 0.5 mm or less.

When the dry heat shrinkage rate of the wrap film is 10% or more and 25% or less in the MD direction and 5% or more and 15% or less in the TD direction, the wrap film wound around the paper tube is in the circumferential direction of the paper tube. Shrinks, so-called tightening occurs. In this regard, according to the wrap film winding body, the arithmetic mean roughness Ra on the outer peripheral surface of the paper tube is 1.9 μm or less. Therefore, even if the wrap film is tightly wound, the outer peripheral surface of the paper tube is in a smooth state, so that the unevenness is not easily transferred to the wrap film. As a result, with the wrap film wound body, quality deterioration such as aesthetics and adhesion can be suppressed.

Further, according to the wrap film winding body, the width of the overlap between the first edge portion and the second edge portion is larger than 0 mm in the axial direction and 0.5 mm or less. Therefore, even if the wrap film is tightened, the overlap of the edges is difficult to be transferred to the wrap film. As a result, quality deterioration due to overlapping edges can be suppressed.

In the wrap film wound body, the main component of the wrap film may be polyvinylidene chloride-based resin. According to this wrap film wound body, it is possible to suppress deterioration of quality such as aesthetics and adhesion of a wrap film containing polyvinylidene chloride-based resin as a main component.

In the wrap film winding body, the outer peripheral surface of the paper tube may be made of high-quality paper. According to this wrap film wound body, it is easy to obtain an outer peripheral surface having an arithmetic mean roughness Ra of 1.9 μm or less in a paper tube.

According to the wrap film wound body of the present invention, deterioration of the quality of the wrap film can be suppressed.

The plan view which shows an example of the structure in one Embodiment of a wrap film winding body. FIG. 5 is a plan view showing another example of the structure in one embodiment of the wrap film winding body. The graph which shows the relationship between the arithmetic mean roughness Ra on the outer peripheral surface of a paper tube, and the arithmetic mean roughness Ra of a wrap film. The graph which shows the relationship between the arithmetic mean roughness Ra on the outer peripheral surface of a paper tube, and the gloss value of a wrap film. The figure which shows the relationship between the width between the end sides and the streak mark on the outer peripheral surface of a paper tube. The figure which shows the relationship between the overlap between the ends on the outer peripheral surface of a paper tube, and a streak mark.

An embodiment of the storage container and the storage container containing the wound body will be described with reference to FIGS. 1 to 6. FIG. 1 shows the wrap film by a chain double-dashed line for convenience of explaining the structure of the wrap film and the paper tube.

As shown in FIG. 1, the wrap film winding body includes a wrap film 10 and a paper tube 20 around which the wrap film is wound. The wrap film winder is stored, for example, in a carton.

[Wrap film 10]
The wrap film 10 has a dry heat shrinkage rate. The dry heat shrinkage of the wrap film 10 when allowed to stand at 95 ° C. for 5 minutes is 10% or more and 25% or less in the MD direction (longitudinal direction) and 5% or more and 15% or less in the TD direction (horizontal direction). be. The dry heat shrinkage rate of the wrap film 10 is preferably 15% or more and 20% or less in the MD direction (longitudinal direction) and 7% or more and 12% or less in the TD direction (horizontal direction).

The following method is used to measure the dry heat shrinkage rate. First, a wrap film 10 for measurement marked at intervals of 10 cm in the MD direction and the TD direction is prepared. Next, the wrap film 10 for measurement is placed on a paper material placed in an oven at a temperature of 95 ° C., and the wrap film 10 for measurement is left in the oven for 5 minutes. Subsequently, the measurement wrap film 10 is taken out of the oven and naturally cooled, and the distance marked on the measurement wrap film 10 is measured. Then, the drying heat shrinkage rate is calculated as a percentage obtained by dividing the decrease value from 10 cm with respect to the measured value by 10 cm.

When the dry heat shrinkage rate is 10% or more and 25% or less in the MD direction and 5% or more and 15% or less in the TD direction, the wrap film 10 is, for example, a paper tube having an outer diameter of 20 mm or more and 40 mm or less. Tightening occurs with respect to 20.

The wrap film 10 is used, for example, when foods such as foodstuffs and dishes are stored in a refrigerator or a freezer, or when they are heated in a microwave oven. Therefore, the wrap film 10 is required that the characteristics of the wrap film 10 are unlikely to deteriorate during the storage period of the wrap film 10 and the storage period of food. The characteristics of the wrap film 10 are that an appropriate adhesive force can be obtained when the wrap film 10 is used, and an appropriate aesthetic appearance can be obtained when the wrap film 10 is used.

For example, in the wrap film 10, since the contents such as food are put in a container such as tableware and sealed, the adhesion between the wrap films 10 and the adhesion between the wrap film 10 and the container are required. On the other hand, if the adhesive force between the wrap film 10 and the container is too high, the peelability of the wrap film 10 is lowered, and it becomes difficult for the wrap film 10 to be peeled from the container. Further, if the adhesive force between the wrap films is too high, the wrap films 10 cling to each other or the wrap films 10 cling to the hands, and it becomes difficult to pull out the wrap film 10 from the carton. Therefore, the wrap film 10 is required to have an appropriate adhesive force between the wrap films 10, between the wrap films 10 and the hands, between the wrap films 10 and the container, and the like.

For example, since the wrap film 10 is used for sealing foods and the like, it is required to have an aesthetically pleasing luster to the extent that the food and the wrap film 10 are sufficiently hygienic. Further, since the wrap film 10 is used for sealing foods and the like, it is required that the foods are sufficiently visible and have excellent smoothness as an aesthetic appearance to some extent.

In order to satisfy the above-mentioned characteristics, the main component constituting the wrap film 10 is, for example, a polyvinyl chloride-based resin, a polyvinyl chloride-based resin, a polyethylene-based resin, a polypropylene-based resin, a polymethylpentene-based resin, a polybradiene-based resin, and the like. It is at least one selected from the group consisting of polystyrene-based resins, polyester-based resins, polyamide-based resins, and ethylene-vinyl acetate copolymers. From the viewpoint of excellent oxygen barrier property, water vapor barrier property, transparency, and heat resistance, the main component constituting the wrap film 10 is preferably a polyvinylidene chloride resin.

Polyvinylidene chloride-based resin is vinylidene chloride formed from vinylidene chloride and another monomer (comonomer) copolymerizable with vinylidene chloride from the viewpoint that various properties required for a film can be easily obtained. Copolymers are preferred.

The co-monomer is vinyl chloride, an acrylic acid alkyl ester having an alkyl group having 1 to 18 carbon atoms, a methacrylic acid alkyl ester having an alkyl group having 1 to 18 carbon atoms, and vinyl cyanide such as methacrylic nitrile. be. The comonomer is an aromatic vinyl such as styrene, a vinyl ester of an aliphatic carboxylic acid having 1 or more and 18 or less carbon atoms, an alkyl vinyl ether having an alkyl group having 1 or more and 18 or less carbon atoms, and vinyl polymerizable unsaturated. It is an alkyl ester of carboxylic acid and vinyl polymerizable unsaturated polycarboxylic acid. These comonomers may be used alone or in combination of two or more. Among these comonomers, vinyl chloride, methyl acrylate, or butyl acrylate is preferable. A more preferable comonomer is vinyl chloride, and a more preferable polyvinylidene chloride-based resin is a vinylidene chloride / vinyl chloride copolymer.

The ratio of vinylidene chloride to the co-monomer is 60% by mass or more and 99% by mass or less of vinylidene chloride and 40% by mass of the co-monomer from the viewpoint that various properties required for the wrap film 10 can be easily obtained. The above is 1% by mass. The ratio of vinylidene chloride to the co-monomer is preferably 70% by mass or more and 95% by mass or less of vinylidene chloride, and 30% by mass or more and 5% by mass or less of the co-monomer, and more preferably chloride. Vinylidene is 75% by mass or more and 92% by mass or less, and comonomer is 25% by mass or more and 8% by mass or less.

The polyvinylidene chloride-based resin may be a plant-derived resin or a fossil fuel-derived resin. The polyvinylidene chloride resin has a weight average molecular weight of, for example, 30,000 or more and 300,000 or less, 50,000 or more and 200,000 or less, or 70,000 or more and 150,000 or less, from the viewpoint that various properties required for a film can be easily obtained.

The wrap film 10 is manufactured, for example, by performing melt extrusion and stretching. In addition to the resin as the main component, the wrap film 10 contains a plasticizer, a stabilizer, a tackifier, an antioxidant, an ultraviolet absorber, a tackifier, an antistatic agent, an antiblocking agent, an antifogging agent, and an antibacterial agent. , Fillers, stabilizers, pigments and other various additives may be included. By containing various additives, the wrap film 10 has various properties such as manufacturability, barrier property, transparency, weather resistance, heat resistance, and adhesion.

[Paper tube 20]
The paper tube 20 has a cylindrical shape in which paper tape 21 is wound. FIG. 1 is a paper tube in which paper tape 21 is spirally wound. The paper tube 20 may be a paper tape 21 wound in a spiral shape, a flat wound shape, or another method. It suffices if the paper tape is wrapped around the surface. The paper tube 20 includes an inner layer and a surface layer 20B that form a cylindrical body. The surface layer 20B constitutes the outer peripheral surface 20S of the paper tube 20. The arithmetic mean roughness Ra on the outer peripheral surface 20S of the paper tube 20 is 1.9 μm or less, preferably 1.5 μm or less, and more preferably 1.3 μm or less. The arithmetic mean roughness Ra is obtained by measurement in accordance with JIS-B-0601-1994.

The cylinder is a hollow cylinder. The wrap film 10 is wound around the surface of the paper tube 20 while applying tension to the wrap film 10. The paper tube 20 has a rigidity that does not deform when the wrap film 10 is wound. The material constituting the cylindrical body is preferably thick paper such as cardboard, used paper, or resin. When the material constituting the cylindrical body is paper, it is preferable to stack the materials in order to provide rigidity.

The surface layer 20B is composed of paper tape 21 which is a strip-shaped paper base material. The outer peripheral surface 20S of the paper tube 20 is the surface of the paper tape 21, and the arithmetic mean roughness Ra on the outer peripheral surface 20S of the paper tube 20 is the arithmetic mean roughness Ra on the surface of the paper tape 21. The paper tape 21 is spirally wound around the outer peripheral surface of the cylinder and adhered to the outer peripheral surface of the cylinder. The surface layer 20B is transparent, translucent, or opaque. The surface layer 20B is colorless or colored. The paper tape 21 is any one selected from the group consisting of high-quality paper, medium-quality paper, kraft paper, coated paper, art paper, and cast coat. The thickness of the paper tape is preferably 100 μm or less, more preferably 50 μm or less. When the thickness is 100 μm or less, even if a step is generated on the outer peripheral surface 20S of the paper tube 20 due to the gap between the spirally wound paper tapes adjacent to each other, or due to the overlap of the paper tapes adjacent to each other. Even if a step is formed on the outer peripheral surface 20S of the paper tube 20, the wrap film 10 is not easily affected by the unevenness because the paper tape is thin. As a result, even if the wrap film 10 is located close to the outer peripheral surface 20S of the paper tube 20, the unevenness is less likely to be transferred to the wrap film 10.

As described above, when the dry heat shrinkage rate of the wrap film 10 is 10% or more and 25% or less in the MD direction and 5% or more and 15% or less in the TD direction, the wrap film wound around the paper tube 20. 10 causes a so-called winding tightening that contracts in the circumferential direction of the paper tube 20. Since the wrap film 10 in which the winding is tightened is likely to have irregularities transferred from the outer peripheral surface 20S of the paper tube 20, the uneven marks formed on the wrap film 10 deteriorate the quality such as adhesion and aesthetics.

Quality such as adhesion and aesthetics is not determined only by the arithmetic mean roughness Ra of the outer peripheral surface 20S, nor is it determined only by the properties of the wrap film 10. That is, qualities such as adhesion and aesthetics are obtained by trial and error by combining the properties of the wrap film 10 that can cause winding tightness and the arithmetic mean roughness Ra of the outer peripheral surface 20S.

In this respect, the paper tube 20 of the present embodiment has an arithmetic average roughness Ra of 1.9 μm or less on the outer peripheral surface 20S of the paper tube 20, so that the paper tube 20 has less unevenness on the outer peripheral surface 20S and is in a smooth state. be. Therefore, even if the wrap film 10 is tightly wound, it is difficult for the unevenness to be transferred to the wrap film 10 at a position close to the outer peripheral surface 20S of the paper tube 20. As a result, in the wrap film 10, quality deterioration such as aesthetics and adhesion can be suppressed.

The paper tape 21 includes a pair of left and right end sides 22 extending in the extending direction (spiral direction) of the paper tape 21. The pair of end sides 22 is composed of a first end side 22A and a spiral second end side 22B. On the outer peripheral surface 20S of the paper tube 20, the first end side 22A of the nth roll (n is an integer of 1 or more) of the paper tape 21 and the second end side 22B of the n + 1th roll of the paper tape 21 are adjacent to each other. And have an interval of 0 mm or more and 0.5 mm or less.

For example, in the left side portion of the paper tube 20 shown in FIG. 1, the first end side 22A of the first roll and the second end side 22B of the second roll are adjacent to each other and orthogonal to each end side 22. A width WS of 0 mm or more and 0.5 mm or less is provided in the direction of the surface. The width WS is preferably 0.2 mm or less, and most preferably 0 mm.

If the width WS between the end sides 22 adjacent to each other is 0 mm or more and 0.5 mm or less, the gap between the first end side 22A and the second end side 22B is narrow even if the wrap film 10 is wound tightly. Therefore, the unevenness generated by the gap is difficult to be transferred to the wrap film 10. Further, when the width WS is 0 mm, there is no gap between the first end side 22A and the second end side 22B, so that the outer peripheral surface 20S of the paper tube 20 is made into a smooth state with no unevenness. Can be done. Therefore, even if the wrap film 10 is tightly wound, the outer peripheral surface 20S of the paper tube 20 is in a smooth state, so that the wrap film 10 at a position close to the outer peripheral surface 20S of the paper tube 20 also has irregularities on the outer peripheral surface 20S. Is difficult to transfer. As a result, quality deterioration due to the gap of the outer peripheral surface 20S can be suppressed.

As shown in FIG. 2, in another example of the paper tube 20, the paper tape 21 includes a pair of left and right edge portions 25 extending in the extending direction (spiral direction) of the paper tape 21. Each edge portion 25 is a region of the paper tape 21 having a width from the end edge 22 constituting the edge portion 25. The pair of edge portions 25 is composed of a first edge portion 25A and a second edge portion 25B. On the outer peripheral surface 20S of the paper tube 20, the first edge portion 25A of the nth roll (n is an integer of 1 or more) overlaps the second edge portion 25B of the n + 1th roll, and the first edge portion 25A and the second edge portion 25A and the second. The width of the overlap with the edge portion 25B is larger than 0 mm and 0.5 mm or less.

For example, in the left side portion of the paper tube 20 shown in FIG. 2, the second edge portion 25B of the second roll overlaps with the first edge portion 25A of the first roll, and the first edge portion 25A and the second edge portion 25B The width WO of the overlap with is larger than 0 mm and 0.5 mm or less in the direction orthogonal to each end side 22. The overlap width WO is preferably 0.2 mm or less, and most preferably 0.1 mm or less.

If the width WO of the overlap between the first edge 25A and the second edge 25B is larger than 0 mm and 0.5 mm or less, the overlap width of the edge 25 is narrow even if the wrap film 10 is wound tightly. Therefore, the unevenness caused by the overlap is difficult to be transferred to the wrap film 10. As a result, quality deterioration due to the overlap of the edge portions 25 can be suppressed.

[Test example]
The operation of the wrap film winding body described in the above embodiment will be described based on a test example.
First, a strip-shaped high-quality paper (thickness 50 μm) was spirally attached to the outer peripheral surface of a cylindrical body made of corrugated cardboard to obtain paper tubes 20 from Test Example 1 to Test Example 7. The dimensions of the paper tube 20 are shown below.

-Inner diameter of paper tube 20: 33.7 mm
-Outer diameter of paper tube 20: 36.1 mm
-Thickness of paper tube 20: 1.2 mm
-Length of paper tube 20: 308.0 mm

In the paper tubes 20 of Test Examples 1 to 3, the first end side 22A and the second end side 22B were butted against each other, and the width between the end sides 22 was set to 0.0 mm. The arithmetic mean roughness Ra of each woodfree paper in Test Examples 1 to 3 is shown below.
-Test Example 1: Ra = 1.3 μm
-Test Example 2: Ra = 1.5 μm
-Test Example 3: Ra = 2.3 μm

In the paper tubes 20 of Test Examples 4 to 7, high-quality paper having an arithmetic mean roughness of 1.5 μm was attached to the outer peripheral surface of the cylinder. The width WS between the end sides 22 and the width WO of the overlap at the edge 25 in Test Example 4 to Test Example 7 are shown below.
-Test example 4: WS = 0.4 mm
-Test example 5: WS = 0.7 mm
-Test example 6: WS = 0.0 mm
-Test example 7: WO = 0.4 mm

The measurement conditions for the arithmetic mean roughness Ra are shown below.
・ Measuring equipment: Surfcom1500DX2 (manufactured by Tokyo Seimitsu Co., Ltd.)
・ Calculation standard: JIS-B-0601-1994
・ Measurement piece length: 1.25 mm
・ Cutoff wavelength: 0.25 mm
・ Measurement range: ± 64.0 μm
-Measurement speed: 0.3 mm / sec-Cutoff type: Gaussian-Inclination correction: Least squares straight line correction

Next, a wrap film 10 containing polyvinylidene chloride as a main component was wrapped around each of the paper tubes of Test Examples 1 to 7, to obtain a wrap film wound body of Test Examples 1 to 7. The dimensions and characteristics of the wrap film 10 are shown below.
・ Width: 300 mm
・ Length: 20m
・ Thickness: 10.5 μm
-Breaking strength: 157 MPa (MD direction), 127 MPa (TD direction)
-Break elongation: 92% (MD direction), 67% (TD direction)
-Dry heat shrinkage: 18.8% (MD direction), 9.4% (TD direction)

[Ra of wrap film 10]
Using the wrap film windings of Test Examples 1 to 3, each wrap film winding was stored for one month in an environment of 20 ° C. or higher and 28 ° C. or lower. Then, the arithmetic mean roughness Ra of the wrap film 10 was measured using the wrap film wound bodies of Test Examples 1 to 3. For the wrap film 10, the arithmetic mean roughness Ra of the surface (inside) of the paper tube 20 in contact with the outer peripheral surface 20S was measured.

FIG. 3 shows the relationship between the measurement result of the arithmetic mean roughness Ra of the wrap film 10 and the length of the paper tube 20 from the outer peripheral surface 20S for each test example. As the measurement conditions for the arithmetic mean roughness Ra, the measurement conditions for the paper tape 21 were used. Here, the length of the wrap film 10 from the outer peripheral surface 20S of the paper tube 20 means the distance from the end when the end of the unwound wrap film 10 is 0 cm. The arithmetic mean roughness Ra of the wrap film 10 was measured by cutting the wrap film 10 10 cm square from each distance position. The same applies to the following evaluations.
As shown in FIG. 3, in the wrap film wound body of Test Example 1, the arithmetic mean roughness Ra of the wrap film 10 is stable at 0.05 μm or less regardless of the distance from the outer peripheral surface 20S of the paper tube 20. ing.

On the other hand, in the wrap film wound body of Test Example 2, the arithmetic mean roughness Ra of the wrap film 10 is in the range of less than 30 cm from the outer peripheral surface 20S of the paper tube 20, and becomes smaller as the distance from the outer peripheral surface 20S increases. It is stable at 0.05 μm or less in the range of 30 cm or more from the outer peripheral surface 20S. However, in the wrap film wound body of Test Example 2, the arithmetic mean roughness Ra of the wrap film 10 in the range of less than 30 cm from the outer peripheral surface 20S of the paper tube 20 is 0.12 μm or less.

On the other hand, in the wrap film wound body of Test Example 3, the arithmetic mean roughness Ra of the wrap film 10 is in the range of less than 100 cm from the outer peripheral surface 20S of the paper tube 20, and is smaller as the distance from the outer peripheral surface 20S is increased. Then, at a position where the distance from the outer peripheral surface 20S of the paper tube 20 is 0 cm, the arithmetic average roughness Ra of the wrap film 10 exceeds 0.25 μm.

[Gloss of Wrap Film 10]
Using the wrap film windings of Test Examples 1 to 3, each wrap film winding was stored for one month in an environment of 20 ° C. or higher and 28 ° C. or lower. Then, the gloss of the wrap film 10 was measured using the wrap film wound bodies of Test Examples 1 to 3. Gloss represents glossiness, and in this test, the higher the gloss value, the more uneven the wrap film 10 is. The measurement surface of the wrap film 10 is the surface (inside) of the wrap film 10 that contacts the outer peripheral surface 20S of the paper tube 20, as in the measurement of the arithmetic mean roughness Ra.

FIG. 4 shows the relationship between the gloss measurement result of the wrap film 10 and the length of the paper tube 20 from the outer peripheral surface 20S for each test example. The gloss measurement conditions are shown below.
・ Measuring equipment: Glossy meter VG2000 (manufactured by Nippon Denshoku Industries Co., Ltd.)
・ Measurement angle: 60 °
As shown in FIG. 4, in the wrap film wound body of Test Example 1, the gloss of the wrap film 10 is maintained at 130% or more in a range of 10 cm or more from the outer peripheral surface 20S of the paper tube 20. Further, in the wrap film wound body of Test Example 2, the gloss of the wrap film 10 is maintained at 130% or more in a range of 20 cm or more from the outer peripheral surface 20S of the paper tube 20. On the other hand, in the wrap film wound body of Test Example 3, the gloss of the wrap film 10 is less than 130% in the range of less than 100 cm from the outer peripheral surface 20S of the paper tube 20.

[Adhesion]
Using the wrap film windings of Test Examples 1 to 3, each wrap film winding was stored for one month in an environment of 20 ° C. or higher and 28 ° C. or lower. Then, using the wrap film winders of Test Examples 1 to 3, the wrap film 10 was unwound, and 10 cm was cut off from the end of the unwound wrap film 10 (the outer peripheral surface 20S side of the paper tube 20). .. At this time, the length of the paper tube 20 from the outer peripheral surface 20S was set to 0 cm. Then, the cut wrap film 10 was put on the tableware (porcelain) and brought into close contact with the tableware. The adhesion between the wrap film 10 and the tableware was visually evaluated to determine the adhesion.

FIG. 5 shows the relationship between the adhesion between the wrap film 10 and the tableware and the length of the paper tube 20 from the outer peripheral surface 20S for each test example.
The “⊚” mark shown in FIG. 5 indicates that an appropriate adhesive force was obtained. The “◯” mark shown in FIG. 5 indicates that the adhesion was observed, but the adhesion was slightly weaker than the adhesion in the outermost layer. The “Δ” mark shown in FIG. 5 indicates that adhesion was observed, but it was easily peeled off. The “x” mark shown in FIG. 5 indicates that they were not in close contact with each other.

As shown in FIG. 5, in the wrap film wound body of Test Example 1, the adhesion of the wrap film 10 is sufficiently suitable except for the range of 10 cm or less from the end of the wrap film 10. Further, in the wrap film wound body of Test Example 2, the adhesion of the wrap film 10 is suitable except for a range of 10 cm or less from the end of the wrap film 10, and a range of 40 cm or more from the outer peripheral surface 20S of the paper tube 20. Then, it is sufficiently suitable for the adhesion between the wrap film 10 and the container. On the other hand, in the wrap film wound body of Test Example 3, the adhesion of the wrap film 10 is insufficient within a range of 40 cm from the outer peripheral surface 20S of the paper tube 20.

[Concave and convex streaks]
Using the wrap film windings of Test Examples 4 to 7, each wrap film winding was stored for one month in an environment of 20 ° C. or higher and 28 ° C. or lower. Then, using the wrap film winders of Test Examples 4 to 7, the wrap film 10 was unwound from the paper tube 20, and then the presence or absence of uneven streaks on the surface of the wrap film 10 was observed.

FIG. 6 shows the relationship between the observation results of the uneven streak marks in Test Examples 4 to 7 and the length of the paper tube 20 from the outer peripheral surface 20S for each test example.
The “⊚” mark shown in FIG. 6 indicates that no uneven streak marks were observed or very small uneven streak marks were observed. The “◯” mark shown in FIG. 6 indicates that uneven streaks were observed, but the appearance of the wrap film 10 was not impaired or the adhesion was not hindered. The “Δ” mark shown in FIG. 6 indicates that uneven streaks were observed to the extent that the appearance was impaired, but the adhesion was not hindered. The “x” mark shown in FIG. 6 indicates that uneven streaks were observed to the extent that the appearance of the wrap film 10 was impaired and the adhesion was hindered.

As shown in FIG. 6, in the wrap film wound body of Test Example 4, the uneven streak marks that follow between the end sides 22 are such that the appearance and adhesion are impaired in a range of 10 cm or less from the end of the wrap film 10. Was recognized by. On the other hand, in the range exceeding 50 cm from the end of the wrap film 10, uneven streaks were observed, but the appearance and close contact were maintained.

In the wrap film wound body of Test Example 5, uneven streaks following between the end sides 22 were observed in a range of 50 cm or less from the end of the wrap film 10 to the extent that the appearance and adhesion were impaired. On the other hand, in the range exceeding 50 cm from the end of the wrap film 10, the appearance was impaired, but the adhesion was not hindered.

In the range of 50 cm or less from the end of the wrap film 10 in the wrap film wound body of Test Example 6, the uneven streak marks were slight, and there was no problem in appearance and adhesion. Further, in Test Example 6, a wrap film 10 having no problem in appearance and adhesion was obtained even in a range of 10 cm or less from the end of the wrap film 10. Further, in the range exceeding 50 cm from the end of the wrap film 10, no uneven streaks were observed, and the wrap film 10 having excellent appearance and adhesion was obtained.

In the wrap film wound body of Test Example 7, uneven streaks following the overlap of the edge portions 25 were observed in a range of 10 cm or less from the end of the wrap film 10 to the extent that the appearance and adhesion were impaired. On the other hand, in the range exceeding 40 cm from the end of the wrap film 10, uneven streaks were observed, but the appearance and close contact were maintained.

As described above, according to the above embodiment, the following effects can be obtained.
(1) Since the arithmetic mean roughness Ra on the outer peripheral surface 20S of the paper tube 20 is 1.9 μm or less, there is little unevenness on the outer peripheral surface 20S of the paper tube 20 and the outer peripheral surface 20S is in a smooth state. Therefore, even if the wrap film 10 is tightly wound, the unevenness on the outer peripheral surface 20S of the paper tube 20 is difficult to be transferred to the wrap film 10. As a result, in the wrap film 10, quality deterioration such as aesthetics and adhesion can be suppressed.

(2) When the distance (width WS) between the adjacent ends is 0 mm or more and 0.5 mm or less, even if the wrap film 10 is wound tightly, the first end side 22A and the second end side The gap with 22B is difficult to be transferred to the wrap film 10. As a result, quality deterioration due to the gap of the outer peripheral surface 20S can be suppressed.

(3) When the width WO of the overlap between the first edge portion 25A and the second edge portion 25B is larger than 0 mm and 0.5 mm or less, the overlap of the edges even if the wrap film 10 is tightened. The unevenness caused by this is difficult to transfer to the wrap film. As a result, quality deterioration due to overlapping edges can be suppressed.

(4) With respect to the wrap film 10 containing a polyvinylidene chloride resin as a main component, the effects according to (1) to (3) can be obtained.
The above embodiment can also be modified and implemented as follows.

-The configuration of the end sides 22 adjacent to each other may be arranged so that the width WS is larger than 0.5 mm. Further, the configurations of the edge portions 25 that overlap each other may be such that the width WO is larger than 0.5 mm. Regardless of the configuration, if the arithmetic mean roughness Ra on the outer peripheral surface 20S of the paper tube 20 is 1.9 μm or less, the aesthetic appearance and adhesion due to the unevenness of the paper base material provided in the surface layer 20B can be obtained. The decrease can be suppressed.

-The inner diameter, outer diameter, thickness, length of the paper tube 20 and the thickness of the wrap film 10 may be other than those described above. Even with this configuration, if the arithmetic mean roughness Ra on the outer peripheral surface 20S of the paper tube 20 is 1.9 μm or less, it is possible to suppress a decrease in aesthetics and adhesion due to the tightness of the wrap film 10. be.

[Additional Notes]
The technical ideas derived from the above embodiments and modifications are described below.
[Appendix 1]
With wrap film
A paper tube around which the wrap film is wound is provided.
The dry heat shrinkage of the wrap film when allowed to stand at 95 ° C. for 5 minutes is 10% or more and 25% or less in the MD direction and 5% or more and 15% or less in the TD direction.
The paper tube has a cylindrical shape in which paper tape is wound.
A wrap film wound body having an arithmetic mean roughness Ra on the outer peripheral surface of the paper tube of 1.9 μm or less.

When the dry heat shrinkage rate of the wrap film is 10% or more and 25% or less in the MD direction and 5% or more and 15% or less in the TD direction, the wrap film wound around the paper tube is in the circumferential direction of the paper tube. Shrinks, so-called tightening occurs. In this regard, according to the wrap film winding body of Appendix 1, the arithmetic mean roughness Ra on the outer peripheral surface of the paper tube is 1.9 μm or less. Therefore, even if the wrap film is tightly wound, the outer peripheral surface of the paper tube is in a smooth state, so that the unevenness is not easily transferred to the wrap film. As a result, with the wrap film wound body, quality deterioration such as aesthetics and adhesion can be suppressed.

[Appendix 2]
In the paper tube, the paper tape is spirally wound.
The paper tape has a pair of edges extending in the extending direction of the paper tape.
The pair of end sides is composed of a spiral first end side and a spiral second end side.
On the outer peripheral surface, the first end side of the nth roll (n is an integer of 1 or more) and the second end side of the n + 1th roll are adjacent to each other and are 0 mm or more and 0.5 mm or less. The wrap film winding body according to Appendix 1 having an interval.

According to the wrap film winding body described in Appendix 2, the distance between the end edges adjacent to each other is 0 mm or more and 0.5 mm or less. Therefore, even if the wrap film is tightened, the gap between the first end side and the second end side is difficult to be transferred to the wrap film. As a result, quality deterioration due to gaps on the outer peripheral surface can be suppressed.

10 ... Wrap film, 20 ... Paper tube, 20B ... Surface layer, 20S ... Outer surface, 21 ... Paper tape, 22 ... Edge, 22A ... First edge, 22B ... Second edge, 25 ... Edge, 25A ... 1st edge, 25B ... 2nd edge.

Claims (3)

With wrap film
The paper tube around which the wrap film is wrapped and
With
The dry heat shrinkage of the wrap film when allowed to stand at 95 ° C. for 5 minutes is 10% or more and 25% or less in the MD direction and 5% or more and 15% or less in the TD direction.
The paper tube has a cylindrical shape in which paper tape is wound.
The arithmetic mean roughness Ra on the outer peripheral surface of the paper tube is 1.9 μm or less.
In the paper tube, the paper tape is spirally wound.
The paper tape includes a pair of edges extending in the extending direction of the paper tape.
The pair of edges is composed of a spiral first edge and a spiral second edge.
On the outer peripheral surface, the first edge portion of the nth roll (n is an integer of 1 or more) overlaps the second edge portion of the n + 1th roll, and the first edge portion and the second edge portion The width of the overlap is larger than 0 mm and 0.5 mm or less. The wrap film wound body according to claim 1, wherein the main component of the wrap film is a polyvinylidene chloride-based resin. The wrap film winding body according to claim 1 or 2, wherein the outer peripheral surface of the paper tube is made of high-quality paper.

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