JP2020171438A - Paper straw and its manufacturing method - Google Patents

Abstract

To provide a paper straw excellent in water proofness, rigidity and manufacturing efficiency without using plastic; and to provide its manufacturing method.SOLUTION: At least one surface side which is an outer surface 11A or an inner surface 11B of a paper straw 10 contains a base paper 11 coated beforehand with a waterproof coating agent such as naturally derived wax 15, and the base paper 11 is wound spirally in piles, while a margin 11C to adhere is shifted gradually as much as a prescribed amount in an oblique direction. and an overlapping part (margin 11C to adhere) of the base paper 11 is fixed mutually adhesively, to thereby form a tube body having both ends communicating with each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a paper straw and a method for producing the same, and more particularly to a paper straw which can replace a conventional plastic straw and a method for producing the same.

In general, straws that are currently in widespread use are formed by extruding heat-melted plastic and cooling it. Also, today, the standard of living material is rising worldwide, and in every food culture in any country, the use of straws when drinking beverages is extremely high. Therefore, the quantity of straws consumed daily around the world is enormous.

That is, although the volume of one straw made of plastic is not large, the number of used straws accumulated every day is very large.

Moreover, since the volume of the plastic straw is small, the reuse rate and value after recycling are not high, and it is difficult to process. As a result, an extremely large amount of straw waste is generated every day in the world without being reused. This large amount of plastic waste is harmful to the environment and living organisms, generates a large amount of marine debris, and requires enormous processing costs to dispose of it.

In addition, plastic straws also have the problem of residual plasticizer or precipitation of plasticizer when eating and drinking hot beverages and hot foods, which is harmful to human health.

Therefore, today, instead of plastic straws, paper straws made by applying, for example, a technique for manufacturing a spiral paper tube as known in Patent Document 1, are sold and used.

However, current paper straws have low water resistance and become moist and soft to fluffy while immersed in drinks. In particular, in recent years, cafe chain stores, coffee shops, convenience stores, and the like are increasing in number of stores offering drinks such as frappe that need to be agitated. In order to deal with such products, it is necessary to provide a paper straw that can maintain rigidity to some extent in moisture.

As a typical method for imparting durability to a paper straw, a method of forming a paper material coated with a coating agent having heat-sealing property and water repellency is known (see, for example, Patent Document 2). The coating agent is a solution of a thermoplastic resin such as a polyethylene resin or a polyvinyl alcohol resin, which is dissolved in paraffin or the like.

Further, as another method, there is a method of forming a normal paper straw, then immersing it in a wax and allowing it to permeate, and laminating the wax on the surface of the straw.

Japanese Patent No. 2914934 Japanese Unexamined Patent Publication No. 6-133840

However, in the conventional method of applying a coating agent having heat-sealing property and water repellency to the base paper like the straw described in Patent Document 1, it is immersed in a solution of a thermoplastic resin such as a polyethylene resin or a polyvinyl alcohol resin. There was a problem that complete deplasticization could not be achieved.

Further, in the conventional method of forming a normal paper straw, then immersing it in a straw and infiltrating it, and laminating the wax on the surface of the straw, continuous production is not possible and the production efficiency is poor. There was a problem that it was not suitable for mass production.

Therefore, there arises a technical problem to be solved in order to provide a paper straw having high water resistance, rigidity, and production efficiency and a method for manufacturing the same without using plastic, and the present invention solves this problem. The purpose is to solve it.

The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a paper straw, which is naturally formed on at least one surface side which is an inner surface or an outer surface of the paper straw. The base paper is wound with a water-resistant coating agent derived from the base paper in a spiral manner while shifting the side edges by a predetermined amount in an oblique direction, and the overlapped portions of the base paper are closely attached to each other. Provided is a paper straw that is formed as a tube that is fixed and has both ends communicating.

According to this configuration, on at least one side, which is the inner surface or the outer surface of the paper straw, for example, a water resistant coating agent using natural clay, a water resistant coating agent using an extract of dietary fiber, and a wax component derived from a living body. By molding a straw using a base paper that has been pre-coated with a naturally-derived water-resistant coating agent such as (for example, naturally-derived wax such as beeswax, rice bran wax, and carnauba wax), water resistance is not used without using plastic. A paper straw with excellent properties and rigidity can be obtained. Further, by molding the straw using the base paper coated with the water resistant coating agent in advance, the production efficiency is remarkably improved as compared with the conventional method of immersing and permeating the straw.

The invention according to claim 2 provides a paper straw in which, in the configuration according to claim 1, the base paper is coated with a water resistant coating agent on both the inner surface and the outer surface, respectively. ..

According to this configuration, a base paper coated with a water-resistant coating agent on both the inner and outer surfaces is spirally wound to make a paper straw, which is further excellent in water resistance and rigidity. A paper straw is obtained.

The invention according to claim 3 provides a paper straw in the configuration according to claim 1 or 2, wherein a naturally occurring glue is used to fix the overlapped portion of the base paper.

According to this configuration, by using a naturally-derived glue such as starch glue for adhesively fixing the overlapped portion of the base paper, a paper straw that does not use any petrified material such as plastic can be obtained.

The invention according to claim 4 is the outer surface in which the water resistant coating agent is applied to the surface of the base paper arranged on the outer surface side of the paper straw in the configuration according to claim 1, 2 or 3. The base paper, the intermediate base paper on which neither the inner surface nor the outer surface is coated with the water resistant coating agent, and the inner surface of the paper straw coated with the water resistant coating agent on the surface arranged on the inner surface side. It is a laminated base paper in which base papers are laminated in order and integrated, and between the back surface side of the outer surface base paper and the outer surface of the intermediate base paper, and between the back surface side of the inner surface base paper and the inner surface of the intermediate base paper. Provided are paper straws, each of which is closely fixed with glue.

According to this configuration, the water resistant coating agent is applied to both the inner surface and the outer surface on the outer surface base paper in which the surface arranged on the outer surface side of the paper straw is coated with the water resistant coating agent. A laminated base paper in which no intermediate base paper and an inner base paper in which a water-resistant coating agent is applied to the surface arranged on the inner surface side of a paper straw are laminated in order and integrated is used, and the side edge portion of this laminated base paper is used. Are stacked by a predetermined amount in an oblique direction and wound in a spiral shape to form a tubular body with both ends communicating with each other, and the overlapping parts of the base paper are closely fixed to each other to form a water resistant coating agent. A paper straw with excellent water resistance and rigidity can be obtained without using plastic. Further, by molding the straw using the base paper coated with the water resistant coating agent in advance, the production efficiency is remarkably improved as compared with the conventional method of immersing and permeating the straw.

The invention according to claim 5 is a method for producing a paper straw, in which a base paper to which a naturally-derived water-resistant coating agent is previously applied is prepared on at least one side which is the inner surface or the outer surface of the paper straw. , The base paper is stacked and spirally wound while shifting the side edges in a predetermined amount in an oblique direction, and the overlapped portions of the base paper are closely fixed to each other via naturally-derived glue, and both ends are Provided is a method for manufacturing a paper straw, which is formed as a continuous tube.

According to this method, on at least one side, which is the inner surface or the outer surface of a paper straw, for example, a water resistant coating agent using natural clay, a water resistant coating agent using an extract of dietary fiber, and a wax component derived from a living body. By preparing a base paper pre-coated with a naturally-derived water-resistant coating agent such as (for example, naturally-derived wax such as beeswax, rice bran wax, and carnauba wax) and molding a straw, without using plastic, A paper straw with excellent water resistance and rigidity can be obtained. Further, by molding the straw using the base paper coated with wax in advance, the production efficiency is remarkably improved as compared with the conventional method of immersing and permeating the straw.

According to the invention, by molding a straw using a base paper coated with a water resistant coating agent in advance, a straw having excellent water resistance and rigidity can be obtained without using plastic. Further, by molding the straw using the base paper coated with the water resistant coating agent in advance, the production efficiency is remarkably improved as compared with the conventional method of immersing and permeating the straw.

An embodiment of a paper straw according to the present invention is shown, where (a) is a side view thereof, and (b) is a front view of (a) seen from the direction of the AA line. The same as above shows a base paper which is in the shape of a tape before forming a straw made of paper and has wax coated on one side. (A) is a plan view of the base paper, and (b) is a side view of the base paper. It is a perspective view which shows roughly the state in the process of forming the straw made by the said paper. It is a configuration layout diagram schematically showing an example of an apparatus for forming a tape-shaped base paper coated with wax on one surface for forming a straw made of the same paper. Another embodiment of the paper straw according to the present invention will be described, where (a) is a side view of a tape-shaped base paper before forming the same paper straw, and (b) is a developed plan view of the base paper. , (C) is a developed side view of the base paper. It is a figure which shows the experimental result of the paper straw.

The present invention is a paper straw according to the present invention, in order to achieve the object of providing a paper straw having high water resistance, rigidity, and production efficiency and a method for manufacturing a paper straw without using plastic. At least one surface, which is the inner surface or the outer surface of the straw, contains a base paper coated with a naturally-derived water-resistant coating agent in advance, and the base paper is stacked in a spiral shape while shifting the side edges in a predetermined amount in an oblique direction. This was achieved by winding the base paper and fixing the overlapped portions of the base paper closely to each other to form a tubular body in which both ends communicate with each other.

Hereinafter, an embodiment according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following examples, when referring to the shape and positional relationship of the components, etc., they are substantially approximated to the shape, etc., except when explicitly stated or when it is considered that it is not apparent in principle. Or similar ones are included.

In addition, the drawings may be exaggerated by enlarging the characteristic parts in order to make the features easy to understand, and the dimensional ratios and the like of the components are not always the same as the actual ones. In addition, the same elements are designated by the same reference numerals throughout the description of the examples.

FIG. 1 shows an embodiment of a paper straw according to the present invention, in which FIG. 1A is an external perspective view thereof, and FIG. 1B is a front view seen from the direction of AA in FIG. Is.

The paper straw 10 shown in FIG. 1 is made of a base paper 11 that has water resistance and can be disposed of as combustible waste. As shown in FIG. 2, the base paper 11 is formed in a tape shape, and the outer surface 11A on the outer surface side of the paper straw 10 is previously coated with wax 15 as a water resistant coating agent. On the contrary, the adhesive 12 is applied to the entire surface of the inner surface 11B, which is the inner surface side of the paper straw, and the portion indicated by the reference numeral 11C is an adhesive margin in which the base paper 11 is laminated and adhered. is there.

As the wax 15 as a water resistant coating agent coated on one surface of the base paper 11, that is, the outer surface 11A, naturally derived waxes such as beeswax, rice bran wax, and carnauba wax are used. In this embodiment, an example in which wax 15 is used as the water resistant coating agent will be described. In addition to the wax 15, for example, a water resistant coating agent using natural clay and extraction of dietary fiber are used as the water resistant coating agent. A water resistant coating agent using a material, a wax component derived from a living body, or the like may be used.
On the other hand, as the adhesive 12, a naturally derived glue such as starch glue is used. As a result, we aim to create a paper straw 10 that does not use any petrified material such as plastic.

Next, a method for manufacturing the paper straw 10 formed of the above materials will be described.

First, a tape-shaped base paper 11 is prepared, in which the outer surface 11A is coated with wax 15 and has durability.

Next, the adhesive 12 is applied to the entire surface of the inner surface 11B, and as shown in FIG. 3, a predetermined amount of the base paper 11 is obliquely applied along the central axis O of the roll shaft 13 in the molding facility (not shown) (this embodiment). Then, the adhesive margin 11C is wound in a spiral shape while shifting by 1) to form one spiral tube body 14 in which both ends communicate with each other. At the time of this winding, the overlapping portion of the base paper 11 (the portion of the width W1 of the adhesive margin 11C) is adhered and fixed to each other by the adhesive 12 applied to the inner surface 11B side of the base paper 11.

Further, when the straw is wound to a certain length and cut, the formation of the paper straw 10 having both ends communicating with each other as shown in FIG. 1 is completed.

The paper straw 10 thus formed can be provided as a paper straw 10 that does not use any petrified material such as plastic. In the paper straw 10, since the wax 15 is coated on the outer surface 11A of the base paper 11, the wax 15 enhances the water resistance and rigidity, and a straw having excellent water resistance and rigidity can be obtained. In addition, by molding a straw, which is a tube body in which both ends communicate with each other, using a base paper 11 coated with wax 15 in advance, the production efficiency is higher than that of the conventional method of lowering and infiltrating into wax. It will improve dramatically.

In addition, as shown in FIGS. 1 and 2 that the width of the base paper 11 is indicated by reference numeral W0 and the width of the overlapping portion of the adhesive margin 11C is indicated by the reference numeral W1, in the paper straw 10, the width of the adhesive margin 11C which is an overlapping portion is shown. W1 can determine the strength of the spiral tube 14. For example, the larger the width W1 of the adhesive margin 11C that is the overlapping portion, the harder it is and the more difficult it is to bend. On the contrary, the smaller the width W1 of the adhesive margin 11C, the more flexible the spiral tube 14 becomes and the easier it is to bend. ..

Therefore, when the width W1 of the overlapping portion (adhesion margin 11C) is adjusted during winding and the width W1 of the overlapping portion is changed between about one-half to one-fourth of the width W0 of the base paper 11, it is hard. The softness can be changed, and the paper straw 10 realizes convenience and high quality in use.

FIG. 4 is a configuration layout diagram schematically showing a configuration example of a wax coating device 20 that previously coats the outer surface 11A, which is the outer peripheral surface of the paper straw 10, with the wax 15. In FIG. 4, the wax coating device 20 includes a wax storage tank 21 containing the molten wax 15, a pair of rotating rollers 22A and 22B, a plurality of guide rollers 23, a base paper supply reel 24, a base paper take-up reel 25, and the like. It is composed of.

Of the pair of rotating rollers 22A and 22B, a part of the outer peripheral surface of the rotating roller 22A is immersed in the wax storage tank 21, and is arranged so as to rotate with the wax 15 included in the outer peripheral surface. There is. On the other hand, the rotating roller 22B is a pinch roller that crimps the tape-shaped base paper 11 passing between the rotating roller 22A and the rotating roller 22B to the rotating roller 22A. Further, as shown by arrows in FIG. 4, the rotating roller 22A rotates in the clockwise direction, and the rotating roller 22B rotates in the counterclockwise direction.

The base paper supply reel 24 is a reel that winds and holds the base paper 11 before wax coating, and the base paper winding reel 25 is a reel that winds and holds the base paper 11 after wax coating.

The plurality of guide rollers 23 are rollers for guiding the base paper 11 drawn from the base paper supply reel 24 to the base paper take-up reel 25 through between the pair of rotating rollers 22A and 22B.

The base paper take-up reel 25 is a reel for winding the base paper 11 which has been wax-coated by passing between the pair of rotating rollers 22A and 22B.

In the wax coating device 20 configured in this way, the base paper 11 drawn from the base paper supply reel 24 is guided between the pair of rotating rollers 22A and 22B by the guide roller 23, and the pair of rotating rollers 22A. , The base paper 11 that has passed between 22B is guided to the base paper take-up reel 25 by the guide roller 23, and the base paper 11 is taken up by the base paper take-up reel 25. Further, during the transportation of the base paper, the wax 15 in the wax storage tank 21 is applied to the outer surface 11A of the base paper 11 by the rotating roller 22A. As a result, the base paper 11 formed by applying wax 15 in advance to the outer surface 11A of the base paper 11 which is the outer peripheral surface of the paper straw 10 is completed. The adhesive 12 is applied to the inner surface 11B of the base paper 11 immediately before the base paper 11 is spirally wound.

In the above embodiment, the case where the wax 15 is applied only to the outer surface 11A side of the base paper 11 has been described, but instead of the outer surface 11A of the base paper 11, the wax 15 is applied only to the inner surface 11B side of the base paper 11. A base paper 11 made of wax may be used, or a paper straw 10 may be formed by using a base paper 11 coated with wax 15 on both the outer surface 11A and the inner surface 11B of the base paper 11. is there. As described above, when the base paper 11 in which the wax 15 is applied to both the outer surface 11A and the inner surface 11B is used, a paper straw 10 having further excellent water resistance and rigidity can be obtained.

Further, for example, as shown in FIG. 5, at the time of molding, the outer surface base paper 111 in which the wax 15 is applied to the outer surface 11A arranged on the outer surface side and the adhesive 12 which is a naturally derived glue are applied to both the upper and lower surfaces. The wax 15 can be straw even if the base paper (laminated base paper) 11 used by laminating the uncoated intermediate base paper 112 and the inner surface base paper 113 in which the wax 15 is coated on the inner surface 11B arranged on the inner surface side is used. Can be molded.

That is, when the paper straw 10 is molded using the base paper (laminated base paper) 11 shown in FIG. 5, for example, the outer base paper 111, the intermediate base paper 112, and the inner base paper 113 are sent from different positions to the roll shaft 13 of the equipment. .. Further, in the middle of feeding, the adhesive 12 is applied to the portion of the intermediate base paper 112 that overlaps the outer base paper 111 and the inner base paper 113. Further, the outer base paper 111, the intermediate base paper 112, and the inner base paper 113 are stacked on the roll axis 13 along the central axis O little by little (for example, the width W1 corresponding to the bonding margin 11C) to form a spiral. Roll. Further, when the straw is wound to a certain length and then cut, the formation of the paper straw 10 having both ends communicating with each other is completed as in the case of the paper straw 10 shown in FIG.

Also in the case of the modified example using the base paper 11 shown in FIG. 5, it can be provided as a paper straw 10 that does not use any petrified material such as plastic. In the paper straw 10, the wax 15 is previously applied to the outer surface 11A (upper surface of the outer base paper 111) and the inner surface 11B (lower surface of the inner base paper 113) of the base paper 11, so that the wax 15 is water resistant. A straw with excellent water resistance and rigidity can be obtained by increasing the rigidity. In addition, since the straw, which is a tube body in which both ends are communicated with each other, is molded using the base paper 11 coated with wax 15 in advance, the production efficiency is significantly higher than that of the conventional method of infiltrating the straw into the wax. improves.

FIG. 6 shows the experimental results for each example. In the experiment, four samples (a), sample (a), sample (b), sample (c), and sample (d) were verified. The sample (a) used in the experiment is a paper straw using bleached kraft base paper that has not been waxed on both the front and back sides, and the sample (b) is waxed only on the inner surface 11B shown in FIGS. 1 to 4. The paper straw and sample (c) using the processed base paper 11 are shown on the outer surface 11A only, and the paper straw and sample (d) using the wax-coated base paper 11 are shown in FIG. Further, it is a paper straw using a base paper 11 which is wax-coated on both the outer surface 11A and the inner surface 11B.

In the experiment, each paper straw formed from the samples (a) to (d) was immersed in water for 10 minutes, 20 minutes, 30 minutes, 40 minutes, and 50 minutes. , Each state was verified when immersed for 60 minutes.

As a result, in the paper straw of the sample (a) using the bleached kraft base paper which was not wax-coated on both the front and back sides, the straw was moistened and softened only by immersing it in water for 10 minutes. In addition, in 20 minutes, the edges were peeled off and fluffing occurred, and the ink printed on the kraft base paper was also eluted.

On the other hand, in the paper straw of the sample (b) using the base paper 11 in which only the inner surface 11B is wax-coated, there was only a slight softening when soaked for 10 to 30 minutes. After soaking for 1 to 60 minutes, softening progress and water content were observed.

In the paper straw of the sample (c) using the base paper 11 in which only the outer surface 11A is wax-coated, when soaked for 10 to 40 minutes, there was only a slight softening, but 50 minutes to After soaking for 60 minutes, progress of softening and water content were observed.

In the paper straw of the sample (d), which uses the base paper 11 in which both the outer surface 11A and the inner surface 11B are wax-coated, the straw remains as it is without water immersion until it is soaked for 20 minutes, and remains as it is for 30 to 60 minutes. Some softening and water content were observed when soaked.

Therefore, in the case of the paper straws 10 of the samples (b), (c), and (d) to which the present invention is applied, the water resistance and rigidity are remarkably improved as compared with the conventional paper straws shown in (a). I found out that I was doing it.

It should be noted that the present invention can be modified in various ways as long as it does not deviate from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.

10: Paper straw 11: Base paper 11A: Outer surface 11B: Inner surface 12: Adhesive 13: Roll shaft 14: Spiral tube 15: Wax (water resistant coating agent)
20: Wax coating device 21: Wax coating roller tank 22A: Rotating roller 22B: Rotating roller 23: Guide roller 24: Base paper supply reel 25: Base paper take-up reel 111: Outer surface base paper 112: Intermediate base paper 113: Inner surface base paper O : Central axis W0: Base paper width W1: Adhesion margin width (overlapping part)

The present invention has been proposed to achieve the above object, and the invention according to claim 1 is a paper straw, which is naturally formed on at least one surface side which is an inner surface or an outer surface of the paper straw. The base paper is wound with a water-resistant coating agent derived from the base paper in a spiral manner while shifting the side edges by a predetermined amount in an oblique direction, and the overlapped portions of the base paper are closely attached to each other. The water resistant coating agent, which is formed as a tubular body that is fixed and has both ends communicating with each other, provides a paper straw , which is a naturally occurring wax .

According to this configuration, at least on one side a paper straws inner or outer surface, a wax component derived from the raw material (e.g., beeswax, rice bran wax, wax of natural origin such as carnauba wax), such as, water of natural origin By molding the straw using a base paper coated with a coating agent in advance, a paper straw having excellent water resistance and rigidity can be obtained without using plastic. Further, by molding the straw using the base paper coated with the water resistant coating agent in advance, the production efficiency is remarkably improved as compared with the conventional method of immersing and permeating the straw.

The invention according to claim 5 is a method for producing a paper straw, wherein a base paper coated with a naturally-derived wax in advance on at least one side which is an inner surface or an outer surface of the paper straw is prepared, and the base paper is prepared. , While shifting the side edges diagonally by a predetermined amount and winding them in a spiral shape, the overlapped parts of the base paper are closely fixed to each other via naturally derived glue, and both ends are communicated with each other. Provided is a method for producing a paper straw formed as a body.

According to this method, at least on one side a paper straws inner or outer surface, a wax component derived from the raw material (e.g., beeswax, rice bran wax, wax of natural origin such as carnauba wax), such as, water of natural origin By preparing a base paper coated with a coating agent in advance and molding the straw, a paper straw having excellent water resistance and rigidity can be obtained without using plastic. Further, by molding the straw using the base paper coated with wax in advance, the production efficiency is remarkably improved as compared with the conventional method of immersing and permeating the straw.

Claims (5)

It ’s a paper straw,
At least one side, which is the inner surface or the outer surface of the paper straw, contains a base paper previously coated with a naturally-derived water-resistant coating agent.
The base paper is spirally wound by stacking the side edges while shifting the side edges by a predetermined amount, and the overlapped portions of the base paper are closely fixed to each other to form a tube body in which both ends communicate with each other. ing,
A paper straw that features that. The base paper is formed by applying a water resistant coating agent to both the inner surface and the outer surface.
The paper straw according to claim 1, wherein the straw is made of paper. Naturally-derived glue is used to fix the overlapped portion of the base paper.
The paper straw according to claim 1 or 2, wherein the straw is made of paper. The base paper is the outer base paper on which the water resistant coating agent is applied to the surface arranged on the outer surface side of the paper straw, and neither the inner surface nor the outer surface is coated with the water resistant coating agent. It is a laminated base paper in which an intermediate base paper and an inner base paper coated with the water resistant coating agent on the surface arranged on the inner surface side of the paper straw are laminated in order and integrated.
The back side of the outer base paper and the outer surface of the intermediate base paper, and the back side of the inner base paper and the inner surface of the intermediate base paper are closely fixed with glue, respectively.
The paper straw according to claim 1, 2 or 3, wherein the straw is made of paper. It ’s a method of manufacturing paper straws.
Prepare a base paper that has been previously coated with a naturally-derived water-resistant coating agent on at least one side that will be the inner or outer surface of the paper straw.
The base papers are stacked and spirally wound while shifting the side edges in a predetermined amount in an oblique direction, and the overlapped portions of the base papers are closely fixed to each other via naturally derived glue, and both ends communicate with each other. Form as a tubular body,
A method of manufacturing a paper straw, which is characterized by this.

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