JP2023061025A - Packaging material and method of manufacturing paper roll package - Google Patents

Abstract

To provide a method of manufacturing a packaging material that is composed of a paper base material, has a plurality of satisfactory properties, and can replace a plastic film used for packaging toilet paper rolls.SOLUTION: There is provided a method of manufacturing a packaging material, the method comprises: obtaining a base paper by running on a paper machine and drying a paper stock made by adding a dry strength agent and a wet strength agent to raw fibers containing 85% or more of pulp fibers with a beating degree of 600 to 800 cc; and obtaining a coated paper having a double-sided sealable surface or a single-sided sealable surface and having a basis weight of 40 to 90 g/m2 by impregnating a heat sealant or a resin emulsion that serves as a coating base for the heat sealant, and by further applying the heat sealing agent to a rough surface in a case of the former (double-sided sealing), or applying the heat sealing agent to a surface to be sealed in a case of the latter (single-sided sealing). Addition of a polyacrylic-amine-based resin as a dry paper strength agent, and addition of a polyacrylic-amide-based resin as a wet paper strength agent are preferable. The obtained paper is improved on a WET tensile strength, which is a weak point of paper, of 700 N/m or more in addition to several satisfactory properties. As a result, toilet paper rolls can be wrapped on automatic or semi-automatic wrapping machines.SELECTED DRAWING: None

Description

TECHNICAL FIELD The present invention relates to a packaging material composed of a paper substrate and suitable for packaging a paper roll such as a toilet paper roll, and a method for manufacturing a paper roll package in which the paper roll is packaged using the packaging material. is.

A plurality of cylindrical paper rolls, which are rolls of toilet paper, kitchen paper, etc., are packed together.
A plastic film made of polyethylene, polypropylene, or the like is used as the packaging material. These plastic films are soft and easily fit on cylindrical paper rolls, and are easily heat-sealed (heat-sealed). The paper roll can be wrapped automatically or semi-automatically by various wrapping methods, and it has sufficient strength and protection function, so it can be carried without damage after wrapping, and the quality of the paper roll is not reduced. was able to save to
Furthermore, since it has a transparent feeling to the extent that the packaged item can be seen from the outside, it is convenient for packaging of products such as toilet paper rolls, which should be checked from the outside to some extent.

Patent Literature 1 describes a typical gusset packaging method in which a toilet paper roll is wrapped with a plastic film.

Japanese Patent Application Laid-Open No. 2021-20742

Recently, it has become necessary to refrain from using plastic waste as much as possible because it is considered that plastic waste has an adverse effect on the environment.
In response, it has been proposed to use paper instead of plastic film.
However, when used as a packaging material, various strengths such as tensile strength, tear strength, bursting strength, printability, and further, when a seal is used for sealing, seal strength is required at a certain level. Be prepared. In addition, in the case of items such as toilet paper rolls that are likely to get wet or to absorb odors, it is necessary to be able to prevent passage of moisture and odor components.
Conventionally, paper has been used as a packaging material, but general packaging paper made of paper is clearly inferior in WET tensile strength to plastic film, and moreover, smells easily transfer. When a toilet paper roll is wrapped with paper to form a package and displayed next to a scented product in a store, the smell of the scented product sticks to the wrapping paper. In addition, when printed on the surface, the ink tends to bleed.
In addition, the transparency is naturally poor, and the packaged item cannot be seen from the outside.
In addition, paper cannot be heat sealed.

The present invention has been made to address the above-mentioned problems of the prior art. Plastics that are made of paper substrates but have several satisfactory properties and have been used for wrapping toilet paper rolls. It is an object of the present invention to provide a new and useful method for producing a packaging material that can replace film.

The present invention has been made to solve the above problems, and the invention of [1] provides a raw material fiber containing 85% or more pulp fiber with a beating degree adjusted to 600 to 800 cc, and a dry paper strength agent. A paper stock to which a wet paper strength agent is added is dried by a paper machine to make a base paper, impregnated with a heat sealing agent or an emulsion of a resin that serves as a coating base for the heat sealing agent, and the heat sealing agent is added to the former. In the case of , it is applied to the rough surface, and in the latter case, it is applied to the surface to be sealed, so that both sides can be heat-sealed or one side can be heat-sealed, and the basis weight is 40-90 g / m ² . A manufacturing method for a packaging material, wherein the coated paper is used as the packaging material.

The invention of [2] is a manufacturing method of the packaging material described in [1], characterized in that a vinyl chloride emulsion is used as the heat sealing agent.

The invention of [3] is a manufacturing method of the packaging material described in [1] or [2], characterized in that an acrylic resin is used as a base resin for applying the heat sealing agent.

The invention of [4] is a packaging material manufacturing method according to any one of [1] to [3], in which a polyacrylamide-based resin is added as a dry paper strength agent, and a polyamide polyamine-based resin is added as a wet paper strength agent. It is a manufacturing method characterized by adding.

The invention of [5] is a method of manufacturing a packaging material according to any one of [1] to [4], characterized in that the basis weight of the base paper is adjusted to 20 to 60 g/ ^m2 . .

The invention of [6] is based on the method of manufacturing a packaging material described in [5], when the basis weight of the base paper is 40 g/m ² or less, the synthetic fibers that partially melt during the drying stage in the papermaking process are replaced with pulp fibers. : Synthetic fiber (mass ratio) = 85-95: 15-5.

The invention of [7] is a manufacturing method of the packaging material described in [6], characterized in that vinylon fibers are used as the synthetic fibers.

The invention of [8] is a method of manufacturing a packaging material according to any one of [1] to [7], characterized in that the WET tensile strength of the packaging material is 700 N/m or more. .

The invention of [9] is a paper roll package, characterized in that the paper roll is wrapped by an automatic or semi-automatic packaging machine with the packaging material manufactured by the method described in any one of [1] to [8]. manufacturing method.

Although the packaging material produced by the method of the present invention is composed of a paper substrate, it can be used as a substitute for conventional plastic film for toilet paper roll packaging.

FIG. 4 is an image diagram of the operation of storing a toilet paper roll in a packaging bag made from the packaging material according to the embodiment of the present invention by a semi-automatic packaging machine. FIG. 2 is a perspective view showing a sealed state after storage in FIG. 1; 1. It is a perspective view which shows the sealed state after accommodation of a toilet paper roll when it is put on an automatic packaging machine and packaged by the packaging method different from FIG.

In the method for manufacturing a packaging material according to an embodiment of the present invention, a raw material fiber slurry is added with an internal chemical to form a paper stock, which is then made into a base paper, and then a heat sealing agent is applied to the base paper. I use coated paper.
[material]
<Fiber>
The packaging material is made by papermaking the raw material fibers.
This raw material fiber is mainly pulp fiber.
The origin of the pulp fiber is not limited, whether it is unused virgin pulp or waste paper pulp. Appropriate selection is required to satisfy the range of When used paper pulp is used, it is used as a raw material after undergoing processes such as defibering, deinking, dust removal, and washing according to the usual methods.
Beating is a process in which the fibers are mechanically beaten and ground in the presence of water using a refiner in a conventional manner. Moderate beating makes the fibers fuzzy and easily entangled, ensuring strength for papermaking. . As the beating progresses, the fibers are cut, the drainage becomes worse, and the freeness decreases. This freeness is used as the degree of beating, that is, freeness.
The beating degree is adjusted so that it falls within the range of 600 to 800 cc.
Also, the stock is adjusted so that the basis weight of the base paper produced by papermaking is 20 to 60 g/m ² .

When the base paper has a basis weight of 40 g/m ² or less, it is preferable to use synthetic fibers in combination so that some of them are melted to strengthen the entanglement of the fibers. Combined use is particularly recommended when the base paper has a basis weight of 30 g/m ² or less.
In this case, the synthetic fiber partially melts during the drying stage in the papermaking process, and is not limited, but the melting point is is preferably 150°C or less. For example, commercially available vinylon fibers, acrylic fibers, polyester fibers, polyolefin fibers, nylon fibers, and rayon fibers made from cellulose can be used. It is most preferable because it becomes easy to get entangled.
When synthetic fibers are used together, the ratio of pulp fibers:synthetic fibers (mass ratio) is 85-95:15-5.
Synthetic fibers are also adjusted to have a freeness of 600 to 800 cc. Pulp fibers and synthetic fibers may be mixed and beaten, or each may be used alone.

<Internal chemicals>
The use of the paper strength improving component improves the strength and the like of the packaging material.
A dry paper strength agent and a wet paper strength agent are both added to a slurry obtained by dispersing raw material fibers in water to prepare a paper stock. The order of addition and the blending amount are appropriately adjusted according to the paper strength agent, but the blending amount is about 0.1 to 5% by weight based on the fiber.
As dry paper strength agents, polyacrylamide-based and polyvinyl alcohol-based synthetic polymer-based agents and starch-based agents derived from natural materials can be used. Also, as the wet paper strength agent, a synthetic polymer having a functional group such as epichlorohydrin, for example, a polyamide polyamine system or the like can be used.

As a dry paper strength agent, polyacrylamide-based “Polystrone (registered trademark), product name: PS-1280 (Arakawa Chemical Industries, Ltd.)”, and as a wet paper strength agent, polyamide-polyamine-based “Arafix (registered trademark) ), product name: AF-255 (Arakawa Chemical Industries, Ltd.)” is a specific example.
The former dry paper strength agent is also excellent for coated base paper, and is particularly recommended when application of a heat sealing agent is assumed.

In addition, it is permissible to add other ingredients as long as they do not impair the expected properties of the packaging material produced by the method of the present invention.

[Papermaking method]
The above stock is wet-processed by a conventional method through a paper machine. The type of the paper machine is not particularly limited, and examples include a fourdrinier paper machine, a short wire machine, a cylinder paper machine, and the like.
A paper machine is divided into a wire part, a press part, and a dryer part, and in the wire part, it is preferable to adjust the basis weight of the base paper to 20 to 60 g/m ² . By keeping the basis weight within the above range, it is possible to ensure the necessary strength while giving a certain degree of transparency as a packaging material.
After squeezing the moisture from the paper in the press part, it is dried in the Yankee dryer in the dryer part.
If the pulp fibers are mixed with foreign synthetic fibers to make paper, the synthetic fibers partially melt and solidify again in this drying step.

[Applying heat sealing agent]
A heat-sealing agent is applied to the base paper obtained by papermaking according to the packaging method of the packaging material.
The heat-sealing agent is an emulsion-type adhesive, and for example, a specific example of a vinyl chloride emulsion is "Vinyblan (registered trademark), product name: 603EML (Nissin Chemical Industry Co., Ltd.)".
The packaging material may be sealed on both sides or may be sealed on one side, and the following application methods are recommended depending on the case.

When both sides are used as sealing surfaces, the substrate is first immersed in a bath of a heat sealing agent, taken out, and dried naturally.
The base paper is impregnated with the heat sealant by immersion, and the impregnation amount after drying is adjusted to 7 to 12 g/m ² .
Next, a heat sealing agent is applied to the rough surface and dried. If it is only impregnated, the heat sealant will be applied more on the glossy surface, and the sealing strength will be greater than the glossy surface > the rough surface. Therefore, the rough surface is further coated with a heat sealing agent to balance it. The coating method is not particularly limited, and various known coating apparatuses such as an air knife coater, blade coater and gravure coater can be used.
The coating weight after drying is adjusted to 7-17 g/m ² . By keeping the amount of coating within the above range, it is possible to secure the required heat-sealing properties on both sides while suppressing the blending amount.

When one side is used as a sealing surface, the substrate is first immersed in an acrylic resin emulsion bath, taken out, and dried naturally.
The acrylic resin is impregnated into the base paper by immersion, and the impregnation amount after drying is adjusted to 7 to 14 g/m ² . By infiltrating the acrylic resin and filling the gaps and hardening it, it becomes a base for construction that is compatible with the heat sealant, while suppressing the penetration into the base paper and making it easier for the heat sealant to adhere to the surface. By setting the impregnation amount within the above range, it is possible to exhibit the above effect while suppressing the blending amount.
Next, a heat sealing agent is applied to the glossy surface to be sealed and dried. The coating weight after drying is adjusted to 5-10 g/m ² . By setting the coating amount within the above range, a necessary and sufficient amount of the heat-sealing agent can be applied and fixed. The coating method is the same as in the case of applying to both sides.

[Coated paper]
The physical properties of coated paper are as follows.
Basis weight: 40-90g/ ^m2
Thickness: 0.060-0.105mm
DRY Tensile Strength:
Vertical (T): 2000-8500N/m
Horizontal (Y): 500-4000N/m
Total length and width (T+Y): 2500 to 12500N/m
WET Tensile Strength:
Vertical (T): 1000-4000N/m
Horizontal (Y): 700-1500N/m
Total length and width (T+Y): 1700 to 5500N/m
Tear strength:
Vertical (T): 150-650mN
Lateral (Y): 250-870mN
Total length and width (T + Y): 400 ~ 1520mN
Bursting strength: 150-360kPa
Seal strength: (Double-sided seal) 0.5 to 2.5N/15mm
(Single-sided seal) 1.5 to 4.5N/15mm
Moisture permeability: 0.050-0.070g/g
Odor transfer: 3 or less Printability: 〇 (Ink penetration depth is 40 μm or less)

In addition, the sealing strength is as follows: sealing pressure: 0.1 MPa, sealing time: 1 second, sealing temperature: 150 ° C., the coated surface and the non-coated surface are sealed together, and the sealed part is cut into a width of 15 mm and opened 180 °. is the force required to pull it apart.
The moisture permeability was calculated from the change in weight after leaving a sample (10 g) for 24 hours in an environment of 40° C. temperature and 90% humidity.
The odor transfer was evaluated by sensory evaluation of the odor of a sample (10 g) placed in a cardboard box together with a softening agent having a strong odor and left for 2 weeks. , the lower the number, the weaker the odor. If it is 3 or less, it is acceptable.

[Coated paper]
The final construction paper continues to have a similar appearance and feel to paper composed solely of pulp fibers, but retains the required strength, including WET tensile strength.
In addition, not only is a heat-sealable sealing surface obtained, but also odor transfer, printability, and transparency are further improved.
It is presumed that these effects were obtained due to the synergistic success of the papermaking process and the process of applying the heat sealing agent.
The packaging material is composed of a paper base material with a paper weight ratio of more than 50%. Therefore, a paper mark, which is an identification mark for paper container packaging, can be displayed.
In addition, it has a paper-like moderate rigidity and is suitable for making bags that can be applied to conventional packaging machines.

For example, when a semi-automatic packaging machine is used, as shown in FIG. 1, toilet paper rolls 3, 3, . . . The fixing margin 1a folded and joined is heat-sealed to complete the package 5.例文帳に追加That is, it can be packaged by a gusset packaging method like a plastic film. In the case of FIG. 2, the edges are put together and sealed, and a single-side-sealed packaging material is used. On the other hand, when an automatic packaging machine is used, as shown in FIG. 3, the top surface and the bottom surface are folded to form a folded part 1b, and the top surface, the bottom surface, and the body surface are sealed. Use packaging that is sealed on both sides.
In addition, it is also possible to store only and seal the opening edge side without sealing using a paper band like a rice bag.

The packaging bag 1 has appropriate rigidity, and the bag retains its shape when made into a bag.
Therefore, after all the toilet paper rolls 3, 3, .

When the basis weight of the base paper is 30 g/m, virgin pulp and vinylon fiber are blended at a ratio of 90:10. , as a dry paper strength agent, "Polystrone (registered trademark), product name: PS-1280 (Arakawa Chemical Industries, Ltd.)", as a wet paper strength agent, "Arafix (registered trademark), product name: AF- 255 (Arakawa Chemical Industry Co., Ltd.)" was added in an appropriate amount, and wet papermaking was carried out by a conventional method to produce base papers of three different basis weights. Incidentally, the basis weight of the base paper is 30 g/m ² , 45 g ^/ m ² , 52 g/m 2 for single-sided sealing, and 30 g/m ² , 45 g/m ² , 50 g/m 2 for double-sided sealing. I made it ² .
From the base paper, a coated paper with a sealing surface on one side and a coated paper with a sealing surface on both sides were produced by the method described above. As the heat sealing agent, "Vinyblan (registered trademark), product name: 603EML (Nissin Chemical Industry Co., Ltd.)" was used.

[Coated paper]
The physical property data of the coated papers were as shown in the table below. For comparison, physical property data for general wrapping paper (basis weight 65 g/m ² ) and polyethylene film for wrapping current toilet paper rolls are also shown. Note that the basis weight of the coated paper is an approximate value.

The general wrapping paper had a large basis weight and a correspondingly high rigidity. When wrapped with this general wrapping paper, the odor was clearly transferred more easily than with the coated paper of the present invention. Further, according to the appearance inspection, there was no sense of transparency at all, and bleeding of the ink was conspicuous.
The physical properties of the polyethylene film, which can be measured by the provided measuring device, were measured. However, since the polyethylene film is practically used as a packaging bag, even if the physical properties cannot be measured, it does not mean that the physical properties are inferior.
From the above table, it was confirmed that the coated paper produced by the method of the present invention is suitable for packaging materials such as toilet paper rolls. Although the seal strength and printability were inferior to those of current polyethylene films, the practicality was sufficient.
Moreover, when the gusset packaging method was actually used as described above, it was confirmed that the packaging can be performed as shown in FIG. 1 and the like.

Although the embodiments and examples of the present invention have been described in detail above, the specific configuration is not limited to the embodiments and examples, and changes in design, etc., without departing from the gist of the present invention. Even if there is, it is included in the invention.

DESCRIPTION OF SYMBOLS 1... Packaging bag 1a... Adhesion margin 1b... Folding part
3... Toilet paper roll 5... Package

Claims (9)

A paper material obtained by adding a dry paper strength agent and a wet paper strength agent to a raw material fiber containing 85% or more of pulp fiber with a beating degree adjusted to 600 to 800 cc, is dried by a paper machine to make a base paper,
Impregnated with a heat-sealing agent or an emulsion of a resin that serves as a coating base for the heat-sealing agent, and further coating the heat-sealing agent on the rough surface in the former case and on the surface to be the sealing surface in the latter case. ^A coated paper that can be heat-sealed on both sides or one side and has a basis weight of 40 to 90 g / m
A method for producing a packaging material, comprising using the coated paper as the packaging material. In the method for manufacturing the packaging material according to claim 1,
A manufacturing method characterized by using a vinyl chloride emulsion as a heat sealing agent. In the method for manufacturing a packaging material according to claim 1 or 2,
A manufacturing method characterized in that an acrylic resin is used as a base resin for applying the heat sealant. In the method for manufacturing a packaging material according to any one of claims 1 to 3,
A production method characterized by adding a polyacrylamide-based resin as a dry paper strength agent and adding a polyamide polyamine-based resin as a wet paper strength agent. In the method for manufacturing a packaging material according to any one of claims 1 to 4,
A manufacturing method characterized by adjusting the basis weight of base paper to 20 to 60 g/m ² . In the manufacturing method of the packaging material according to claim 5,
When the basis weight of the base paper is 40 g/m ² or less, synthetic fibers that partially melt during the drying stage in the papermaking process are blended at a pulp fiber:synthetic fiber (mass ratio) of 85 to 95:15 to 5. A method for manufacturing a packaging material, characterized by: In the manufacturing method of the packaging material according to claim 6,
A manufacturing method characterized by using a vinylon fiber as the synthetic fiber. In the method for manufacturing a packaging material according to any one of claims 1 to 7,
A manufacturing method, wherein the WET tensile strength of the packaging material is 700 N/m or more. A method for manufacturing a paper roll package, comprising wrapping a paper roll with a wrapping material manufactured by the method according to any one of claims 1 to 8 by an automatic or semi-automatic wrapping machine.

Images