WO2020171486A1 - Method for manufacturing eco-friendly paper straw and eco-friendly paper straw manufactured thereby - Google Patents

Abstract

The present technology relates to a method for manufacturing an eco-friendly paper straw and an eco-friendly paper straw manufactured thereby. The method for manufacturing an eco-friendly paper straw according to the present technology comprises the steps of: providing coated paper obtained by coating at least one of both surfaces of a substrate with an acrylic-based, water-dispersible paper coating; bending the coated paper such that one end and the other end of the coated paper overlap each other to form an overlapping section; and sealing the overlapping section.

Description

Manufacturing method of eco-friendly paper straws and eco-friendly paper straws manufactured thereby

The present invention relates to a method of manufacturing an eco-friendly paper straw and an eco-friendly paper straw manufactured thereby, and more specifically, to a method of manufacturing an eco-friendly paper straw that does not contain an adhesive, and an eco-friendly paper straw manufactured thereby.

Plastics are cheap and durable, so they are often used as a material for straws that suck food and beverages.

Plastic is known to be a recyclable raw material. However, in general, in the manufacturing process of plastic products, it is often made difficult to recycle from the manufacturing stage, or is discarded as it is due to contamination or damage in the discharge or collection stage. Recently, a video of removing a plastic straw from a turtle's nose, or a plastic island of plastic garbage shows this reality clearly.

As a result, world-renowned companies such as Starbucks and McDonald's and large cities such as Vancouver are making moves to ban plastic straws. Starbucks has announced that it will eliminate plastic straws at 28,000 stores worldwide by 2020.

Paper straws are enough to replace plastic straws.

Paper straws have been used in the past, but because of the manufacturing cost problem, their sales are known to account for only 0.1% of plastic straws.

In addition, conventional paper straws inevitably require an adhesive due to their structure, which causes a problem in which the adhesive is separated (migrated) during the user's drinking process. An adhesive such as PLA (Polylactic Acid) or PVAc (Polyvinyl acetate) is dissolved in hot drinking water and enters the user's mouth. This leads to a problem of increasing manufacturing cost, such as the need to use an adhesive that is harmless to the human body.

The inventor of the present invention came to complete the present invention after long research and trial and error in order to solve these problems.

An embodiment of the present invention provides a method for manufacturing an eco-friendly paper straw that does not contain an adhesive, and an eco-friendly paper straw manufactured thereby.

Meanwhile, other objects not specified of the present invention will be additionally considered within a range that can be easily deduced from the following detailed description and effects thereof.

An eco-friendly paper straw manufacturing method according to an embodiment of the present invention comprises the steps of: providing a coated paper coated with an acrylic-based water-dispersible coating agent for papermaking on at least one side of both sides of a substrate; Bending one end and the other end of the coated paper to overlap each other to form an overlap section; And sealing the overlap section.

The coated paper includes a first coating layer disposed under the substrate and a second coating layer disposed on the substrate, and in the overlap section, the first coating layer of one end of the coated paper may be fused with the second coating layer of the other end of the coated paper. have.

The paper straw extends in a first direction, and the coated paper has a length in the first direction and a width in a second direction orthogonal to the first direction, and the overlap section is 1/of the width of the coated paper. It may be formed over a range of 10 to 1/2.

The sealing may be performed by a heat sealing method.

The sealing may be performed by pressing the overlap section at a predetermined pressure and temperature for a preset time.

In the sealing step, an ultrasonic irradiator or an iron may be used.

The coated paper may have a basis weight of 33 to 162 g/m ² .

In addition, a method of manufacturing an eco-friendly paper straw according to an embodiment of the present invention includes: providing two or more fabrics including at least one coated paper coated with an acrylic-based water-dispersible coating liquid for papermaking on at least one side of both sides of a substrate; Stacking the fabrics with each other and winding them in a paper tube method; And bonding the wound fabrics to each other in an overlapping section overlapping each other.

The bonding may include heating the wound fabrics.

The heating may use a hot air.

In the winding step, the first fabric and the second fabric are overlapped and wound, and the first and second fabrics may be wound by overlapping each other so that the coated surface faces the outside of the joint.

The coated paper may have a basis weight of 33 to 162 g/m ² .

In addition, the eco-friendly paper straw according to an embodiment of the present invention includes one or more coated papers coated with an acrylic-based water-dispersible coating liquid for papermaking on at least one surface of a substrate, wherein the one or more coated papers form the shape of the straw. It has an overlap section that is bonded to each other, and the overlap section may not include a separate adhesive.

This technology can provide eco-friendly paper straws that can be manufactured without adhesives.

In addition, since this technology can manufacture paper straws without adhesives, there is no fear of melting in hot drinking water such as PLA or PVAC, which are conventional adhesives.

In addition, since the present technology can manufacture a paper straw without an adhesive, the straw manufacturing cost can be drastically reduced.

1 is a flowchart illustrating a method of manufacturing an eco-friendly paper straw according to an embodiment of the present invention over time.

2 is a diagram showing a cross-sectional view of a coated paper used in a method of manufacturing an eco-friendly paper straw according to an embodiment of the present invention.

3A is a view showing a cross-sectional view of a coated paper bent in a step according to an embodiment of the present invention.

3B is a view showing a cross-sectional view of a state in which sealing is performed on a section that is bent and overlapped in a step according to an embodiment of the present invention.

4 is a view showing a cross-sectional view taken along line AA′ and a paper straw manufactured according to an embodiment of the present invention.

5 is a flowchart illustrating a method of manufacturing an eco-friendly paper straw according to another embodiment of the present invention over time.

6 is a diagram schematically showing coated papers wound in a paper tube manner in a step according to another embodiment of the present invention.

7 is a view showing a cross-sectional view taken along line AA′ and a paper straw manufactured according to an embodiment of the present invention.

8 is a diagram schematically showing coated papers wound in a paper tube method according to another embodiment of the present invention.

9 is a view showing a cross-sectional view of a single-sided coated coated paper according to another embodiment of the present invention.

10 is a diagram schematically showing coated papers wound in a paper tube manner using three coated papers according to an embodiment of the present invention.

The accompanying drawings are exemplified by reference for an understanding of the technical idea of the present invention, and the scope of the present invention is not limited thereto.

In the following, the most preferred embodiment of the present invention will be described. In the drawings, thickness and spacing are expressed for convenience of description, and may be exaggerated compared to actual physical thickness. In describing the present invention, known configurations irrelevant to the gist of the present invention may be omitted. In adding reference numerals to elements of each drawing, it should be noted that only the same elements have the same number as possible, even if they are indicated on different drawings.

1 is a flowchart illustrating a method of manufacturing an eco-friendly paper straw according to an embodiment of the present invention over time.

And Figure 2 is a view showing a cross-sectional view of the coated paper used in the eco-friendly paper straw manufacturing method according to an embodiment of the present invention.

First, as shown in FIG. 1, the method of manufacturing an eco-friendly paper straw (hereinafter, referred to as a'paper straw manufacturing method' for convenience of explanation) is a step of providing a coated paper (S110), a step of bending so that an overlap section is formed. (S129) and sealing (S130).

And, as shown in Figure 2, the coated paper 100 used in the paper straw manufacturing method includes a substrate 102 and coating layers 110 and 120 coated on both sides of the substrate.

First, in step S110, a coated paper 100 is provided. Coated paper may be referred to as coated paper.

The coated paper 100 is formed by forming the coating layers 110 and 120 on the substrate 102. That is, the substrate is coated with a water-dispersible coating agent for papermaking. In contrast, in the present invention, an uncoated substrate may be referred to as the base paper. Both the original and coated paper can be referred to as fabric.

The substrate 102 is made of paper. The substrate may be coated paper, uncoated paper, or kraft paper. In the present invention, it is assumed that the substrate is non-coated paper for convenience of description. Uncoated paper is paper that has not been coated with chemicals or fine stone powder. Since a paper straw is a part that directly contacts a person's mouth and food, it is preferable to be made of raw materials that are harmless to the human body.

The substrate 102 may have a basis weight of 30 to 150 g/m ² . If it is less than 30 g/m ² , the tension becomes too weak, which is disadvantageous for continuous processing. In the process of coating with an aqueous solution, if the speed is not very slow, the problem of breaking may occur. If it is larger than 150 g/m ² , it may not be easily bent, and thus a contact area (ie, an overlap section) to be described later may be lifted. When bending, as the contact area becomes thicker, it becomes difficult to derive the smooth surface of the straw. Poor compatibility.

The coating layers 110 and 120 are for improving moisture-proof properties and heat sealability. The coating layers 110 and 120 include an upper coating layer 110 disposed above and a lower coating layer 120 disposed below the substrate.

According to an embodiment of the present invention, the coating liquid for making the coating layers 110 and 120 is a water-dispersible coating agent for papermaking (hereinafter, also referred to as a'coating agent' for convenience of explanation).

In one example, the coating agent is an acrylic-based water-dispersible coating agent. For example, the acrylic-based water-dispersible coating agent may include a copolymer emulsion in which an acrylic polymer and a silicone polymer are copolymerized, and an aqueous polyvinyl alcohol colloid solution gelatinized therein.

The acrylic polymer resin has heat sealability in some sections of the polymerization degree of the acrylic monomer. Therefore, when the substrate is coated with a coating agent that satisfies the degree of polymerization, the basis for adhering the coated paper without an adhesive is provided.

The coating amount of the coating agent may be 3 to 12 g/m ² based on solid content. In the case of a coating of less than 3 g/m ² , there is a problem in that the moisture-proof performance is poor and the sealing is not performed well. In the case of coatings exceeding 12 g/m ² , blocking problems arise.

Accordingly, the coated paper 100 including the coating layer on the substrate may have a basis weight of 33 to 162 g/m ² . At this time, the lower limit corresponds to a value obtained by adding the lower limit of the substrate and the lower limit of the coating agent for the same reason as described above, and the upper limit may correspond to a value obtained by adding the upper limit of the substrate and the upper limit of the coating agent for the same reason as described above.

Acrylic monomers that can be used in the present invention are methyl acrylate, ethyl acrylate, 2-hydroxyethyl acrylate propyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl In the group consisting of methacrylate, hydroxyethyl methacrylate, propyl methacrylate, n-butyl methacrylate, cyclohexyl methacrylate, isobutyl methacrylate, acrylonitrile, methacrylic acid and combinations thereof It may consist of one or more selected compounds. Preferably, the acrylic monomer may be made of a combination of butyl acrylate, methyl methacrylate, hydroxyethyl methacrylate, and methacrylic acid.

In addition, the silicone-based monomers that can be used in the present invention include hexamethylcyclotrisiloxane, 　octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, 　dodecamethylcyclohexasiloxane, 　trimethyltriphenylcyclotrisiloxane, 　tetramethyltetraphenylcyclotetrasiloxane , Octaphenylcyclotetrasiloxane, and a cyclosiloxane compound selected from the group consisting of combinations thereof.

The degree of polymerization of the acrylic polymer, the degree of polymerization of the silicone polymer, the ratio of the acrylic polymer and the silicone polymer, the weight average molecular weight and average diameter of the particles contained in the copolymer emulsion, the solid content ratio of the copolymer emulsion, the concentration, the degree of saponification of polyvinyl alcohol ), for information on the weight ratio of the copolymer emulsion and the polyvinyl alcohol colloidal aqueous solution, other added water, initiator, emulsifier, buffer, etc., refer to the contents disclosed in the patent document of Patent Application No. PCT-KR2017-010598 filed by the present applicant. I can.

In step S120, one end and the other end of the coated paper are bent so as to overlap each other to form an overlap section OS.

Since one end and the other end of the coated paper are bonded to each other as described later in the overlap section, step S120 may be referred to as a pre-work for bonding.

Then, in step S130, a sealing process for the overlap section OS is performed.

The sealing process may be performed by a heat sealing method.

Steps S120 and S130 may be performed in one process. That is, sealing may be performed immediately after bending in a device that performs bending and sealing at the same time. However, in the present invention, for convenience of description, an embodiment that is a process that is separate from each other will be described.

Hereinafter, steps S120 and S130 will be described in more detail with reference to FIG. 3.

3A is a diagram showing a cross-sectional view of a coated paper bent in a step S120 according to an embodiment of the present invention. In addition, FIG. 3B is a view showing a cross-sectional view of a state in which sealing is performed for a section that is bent and overlapped in step S130 according to an embodiment of the present invention.

First, referring to FIG. 3A, one end E1 and the other end E2 of the coated paper 100 overlap each other to form an overlap section OS. It may be bent once so that both ends overlap each other.

Referring to FIG. 2 described above in more detail, as shown in the drawings, the coated paper 100 may have a width in the x-axis direction in the xyz coordinate system and a length in the z-axis direction. Although not shown in the drawing, by having a sufficiently long length (for example, 5 to 25 cm) in the z-axis direction, the straw that mediates the user's mouth and food (drinking water) can perform its original function. In addition, although shorter than this, it has a width of a predetermined length in the x-axis direction (for example, 1 to 2.5 cm), forming an overlapping section that overlaps each other when bending, and at the same time forming a hollow (H) inside the food. You can create this flowing passage. In addition, the coated paper has a thickness in the y-axis direction. The thickness may be, for example, 0.3 ~ 1.5mm.

According to an embodiment of the present invention, the overlap section OS may be formed over a range of approximately 1/10 to 1/2 with respect to the width of the coated paper 100. That is, when the coated paper is bent, the section where one end and the other end overlap to occupy 1/10 to 1/2 of the width of the coated paper.

For example, when the width of the coated paper is 1 to 2.5 cm, the overlap section may be formed with a width of 0.1 to 1.25 cm.

If the overlap section is formed smaller than 1/10, it is difficult to secure sufficient adhesive strength for sealing because the bonding area is narrow (that is, it may be released during manufacturing and use). The peel strength, which represents the adhesive strength, is very low. As such, the contact area can be easily torn off. If it is formed larger than 1/2, it is not economical because loss of material is expected due to unnecessary increase in bonding area. Therefore, it is preferable that the overlap section has a range of 1/10 to 1/2 with respect to the width of the coated paper.

As shown in FIG. 3A, the upper coating layer 110 of the other end portion (indicated by E1 in the drawing) overlapping upward is disposed to face the lower coating layer 120 of the one end portion (indicated by E2 in the drawing) overlapping downward. And, an overlap section is formed in a section where they face each other.

In step S130, as shown in FIG. 3B, the overlap section is sealed.

The sealing site is referred to as SP in the figure. In the drawings, the sealing portion (SP) is shown as a thick solid line for convenience of explanation, but is not limited thereto, and actually corresponds to a shape in which the upper and lower coating layers of the overlap section are melted and adhered to each other (as if the coating layers are fused together. Like the way it was).

The sealing process may be performed by a heat sealing method.

In the coated paper 100 according to an embodiment of the present invention, since the coating agent has an inherent melting temperature (T _m ), step S130 may be performed in consideration of this. That is, according to an embodiment of the present invention, since the acrylic-based water-dispersible coating agent T _m is in the range of 300 to 340 °C, step 130 may apply heat so that the overlap section has a temperature of 300 to 340 °C. .

The process of applying heat can be performed using an ultrasonic irradiator or an iron. For example, the overlapping section may be heat-sealed by introducing the coated paper passed through the step S120 into a sealing device (not shown) having an ultrasonic irradiator or an iron.

In addition, for sealing, a process of pressing the objects to be joined (ie, one end and the other end of the coated paper disposed in the overlap section) to each other in the process of applying heat may be performed together.

In general, since the peel strength has a tendency to be proportional to the pressure applied to the bonding portion, a predetermined pressure can be applied to secure the peel strength required for the overlap section. Considering that the basis weight of the above-described coated paper is 33~162 g/m ² , it is suitable for the bonding areas of the coated paper to remain in contact, and a pre-contact state that allows the bonding areas to be immediately bonded when heat is applied. Appropriate pressure can be applied to ensure that it remains stable. For example, a pressure of 0.2kg/cm2 or more may be applied.

Pressurization may use a pressurizing device (press, etc.) that pressurizes from top to bottom and from bottom to top around the overlap section. For example, the sealing device may include a pressing portion (not shown), and the pressing portion can be pressed in the vertical direction during the heat sealing process of the overlap section.

In general, since the peel strength is proportional to time and tends to converge to a predetermined value, the pressure applied to the overlap section can be maintained for a predetermined time or longer. Considering that the basis weight of the coated paper is 33 to 162 g/m ² , the pressure is applied for an appropriate time to ensure sufficient peel strength for the joints of the coated paper and to reduce unnecessary process duration. Can be controlled to lose. For example, it may be pressurized for 0.5 seconds or more at the temperature and pressure.

Meanwhile, the above-described control variables, such as temperature, pressure, and time, are closely related to each other. When the temperature is relatively high, the pressure application time may be shortened, and when the temperature is relatively low, the pressure application time may be lengthened. In addition, when the pressure application time is relatively long, the applied pressure may be lowered, and conversely, when the pressure application time is short, the applied pressure may increase.

4 shows a paper straw manufactured according to an embodiment of the present invention. In FIG. 4, a cross-sectional view taken along line AA′ is shown together.

Referring to FIG. 4, it can be seen that the paper straw ST1 manufactured by the above-described steps S110 to S130 is composed of a coating layer CL coated on both sides of the substrate P. The coating layer has an inner coating layer CLi and an outer coating layer CLo.

For the substrate and the coating layer, the description in FIGS. 1 to 3 described above may be equally applied. The substrate P corresponds to the above-described substrate 102, and the coating layers CLi and CLo correspond to the above-described coating layers 110 and 120.

In FIG. 3 described above, in order to describe the heat sealing process in detail, the overlap section, which is a part in which heat sealing is performed, is clearly shown thicker than other parts, but in fact, the coated paper itself has a very thin thickness compared to the full scale of the paper straw (for example, 0.3 ~ 1.5mm, see the description of Fig. 2), as shown in the cross-sectional view of Fig. 4, the paper straw can have a long cylindrical shape without a large thickness change in the overlap section.

Meanwhile, in the above, an embodiment in which the coated paper is a double-sided coating has been mainly examined, but the present invention is not limited thereto, and the same description as in FIGS. 1 to 4 may be applied even in the case of single-sided coating. For example, even when the coated paper is a single-sided coating and includes only a substrate and an upper coating layer, bonding may be made between the upper coating layer of the other end overlapped above and the substrate of one end overlapped downward, and thus, the sealing region as described above is Can be defined. However, considering the moisture-proof properties of the straw, it is more preferable to use double-sided coating.

5 is a flowchart illustrating a method of manufacturing an eco-friendly paper straw according to another embodiment of the present invention over time.

And FIG. 6 is a diagram schematically showing coated papers wound in a paper tube method in step S220 according to another embodiment of the present invention.

First, referring to FIG. 5, a method of manufacturing an eco-friendly paper straw (hereinafter, referred to as a'paper straw manufacturing method' for convenience of explanation) includes providing coated papers (S210), winding up (S220), and bonding ( S230).

And referring to FIG. 6, the provided two coated papers 200 and 300 overlap each other and are wound in a paper tube manner.

The paper tube method means that several fabrics are stacked on top of each other and wound on a winding pipe in a spiral manner. At this time, the coated papers may be completely overlapped over the entire area, but are disposed so as to overlap each other and are wound. In the drawing, the overlapping section is indicated by reference numeral OS1, which is referred to as the first overlap section. If necessary, the first overlapping section may be wider than that shown in the drawings, but in the present invention, for convenience of explanation, it is assumed that only the areas shown in the drawings are overlapped. In addition, the direction injected into the winding pipe for winding is referred to as ID in the drawing.

According to an embodiment of the present invention, the first overlap section (OS1) may be formed over a range of approximately 1/5 to 4/5 of the width of the coated paper, considering the basis weight of the coated paper of 33 to 162 g/m ² . have. That is, the section where the first coated paper and the second coated paper overlap may occupy 1/5 to 4/5 of the width of each coated paper. For example, when the width of the coated paper is 1 to 2.5 cm, the overlap section may be formed with a width of 0.2 to 2.0 cm. If the overlap section is formed smaller than 1/5, the overlap tolerance becomes too narrow, making the spiral winding operation difficult, and when it is formed larger than 4/5, it is difficult to control the formation of the thickness of the branch pipe.

Referring again to FIG. 5, a method of manufacturing a paper straw according to an embodiment of the present invention will be sequentially described.

First, in step 210, two or more coated papers 200 and 300 are provided.

As the coated papers 200 and 300, the coated paper 100 described above in FIGS. 1 to 4 may be used. That is, the coated papers 200 and 300 may have the same structure as the coated paper 100 described above. Accordingly, a more detailed description will be omitted.

The first coated paper 200 includes a substrate 202 and coating layers 210 and 220 coated on the upper and lower portions of the substrate. It is referred to as the upper coating layer 210 and the lower coating layer 220, respectively.

The second coated paper 300 includes a substrate 302 and coating layers 310 and 320 coated on the upper and lower portions of the substrate. It is referred to as an upper coating layer 310 and a lower coating layer 320, respectively.

In the present invention, an embodiment of manufacturing a straw with two coated papers will be mainly described, but the present invention is not limited thereto, and the same description can be applied even when manufacturing a straw with three coated papers.

In step S220, the coated papers 200 and 300 are overlapped with each other and wound in a paper tube method.

The first coated paper 200 and the second coated paper 300 overlap each other and are wound. The first and second coated papers 200 and 300 are overlapped with each other so that the coated surface faces outward. In the drawing, the upper coating layer 210 of the first coated paper and the lower coating layer 320 of the second coated paper are overlapped and wound toward the outside (ie, the outer side of the bonding area). That is, the upper coating layer 210 of the first coated paper faces upward and the lower coating layer 320 of the second coated paper faces downward, so that it is overlapped and wound. On the other hand, on the contrary, the lower coating layer 220 of the first coated paper and the upper coating layer 310 of the second coated paper are arranged to face the inside (that is, the inner side of the bonding area).

The coated papers 200 and 300 are wound in a spiral manner based on a winding pipe (not shown), and in the drawing, the second coated paper 300 is disposed closer to the winding pipe than the first coated paper 200. Accordingly, the second coated paper 300 forms the inner side of the straw, and the outer side of the first coated paper 200 is formed.

Therefore, referring to an enlarged view of a portion where the coated papers are overlapped in FIG. 6 (a portion indicated by A in the drawing), the first coated paper 200 is disposed on the second coated paper 300. That is, the upper coating layer 310 of the second coated paper 300 is disposed to face the lower coating layer 220 of the first coated paper 200. The portions arranged to face each other may be defined by the above-described primary overlap section OS1.

Meanwhile, the above arrangement is only for convenience of description, and the first coated paper and the second coated paper may be disposed opposite to each other.

As it is wound in a spiral manner, portions of the first coated paper 200 and the second coated paper 300 facing each other are added from the point of time after being wound on the winding pipe. That is, before winding, the facing portion is the first overlap section, and after winding, the facing portion is the second overlap section. The added overlap section is referred to as the second overlap section OS2 in the drawing. The second overlap section may be a section other than the first overlap section OS1 with respect to the width of the coated paper. The secondary overlap section may be flexible depending on the winding angle, but may have a secondary overlap section as shown in the drawing in consideration of the thickness of the branch pipe that increases during winding.

The first coated paper 200 is disposed on the second coated paper 300 in the second overlapping section OS2 as well. That is, the upper coating layer 310 of the second coated paper 300 is disposed to face the lower coating layer 220 of the first coated paper 200.

The first overlapping section OS1 and the second overlapping section OS2 described above provide a space in which the coated papers 200 and 300 can be bonded to each other. As described later, the coated papers are joined in the first overlap section and the second overlap section.

The coated papers wound in step S230 according to an embodiment of the present invention are bonded to each other in an overlapping section overlapping each other.

For bonding, a process of heating the wound coated papers 200 and 300 may be performed. For example, a process of passing the wound coated papers through a heating device (not shown) equipped with a heating unit may be performed. The heating unit may be a hot air fan (such as a chamber). For example, it may be exposed to hot air while passing through the hot air of the heating device. The heating process in step S230 is not limited thereto, and various methods for applying heat to the overlap sections OS1 and OS2 may be applied.

In the coated papers 200 and 300 according to an embodiment of the present invention, since the coating agent has an inherent melting temper, step S230 may be performed in consideration of this. That is, according to an embodiment of the present invention, since the acrylic-based water-dispersible coating agent T _m is in the range of 300 to 340 °C, step 230 may apply heat so that the overlap sections have a temperature of 300 to 340 °C. .

On the other hand, in the winding process of step S220, the coated papers are already wound on the winding pipe with a predetermined tension. Therefore, since the coated papers are in a state of being pressed toward each other, if heat is applied in step S230, the coated papers may melt and adhere to each other even if there is no external pressure. It is placed in a state where it can be fused when heat is applied as it is wound. Unlike the process described above in FIGS. 1 to 4, it has the advantage of not requiring a separate pressing process.

In general, since the peel strength is proportional to time and tends to converge to a certain value, the heating process of step S230 considers that the basis weight of the coated paper is 33 to 162 g/m ² It can be carried out for an appropriate time to ensure that the joint portions can secure sufficient peel strength and also reduce unnecessary process duration. For example, the exposure time in the chamber may be 0.5 seconds or more.

7 shows a paper straw manufactured according to an embodiment of the present invention. 7 is a cross-sectional view taken along line AA′.

Referring to FIG. 7, the paper straws ST2 manufactured by the steps S210 to S230 described above include a first coated paper 200 forming an outer surface of the straw and a second coated paper forming an inner surface of the straw ( 300). Specifically, the upper coating layer 210 of the first coated paper forms the outer side of the straw, and the lower coating layer 320 of the second coated paper forms the inner side of the straw.

In FIG. 6 described above, in order to describe the bonding process in detail, the overlap section (especially OS1), which is the portion where the bonding is made, is clearly shown thicker than the other portions, but in fact, the coated paper itself has a very thin thickness compared to the full scale of the paper straw (example As shown in the cross-sectional view of FIG. 7, the paper straw may have a long cylindrical shape without a large change in thickness in the overlap section.

On the other hand, even when one of the two or more coated papers is single-sided coating, a paper straw can be manufactured. Hereinafter, refer to FIGS. 8 to 9.

8 is a diagram schematically showing coated papers wound in a paper tube method according to another embodiment of the present invention. It corresponds to the above-described step (S220).

As two or more coated papers, since the description described above in FIGS. 5 and 6 can be applied in the same manner, except that one of them is a single-sided coating rather than a double-sided coating, the differences will be mainly looked at.

And Figure 9 is a view showing a cross-sectional view of a single-sided coated coated paper according to another embodiment of the present invention.

8 and 9, two or more coated papers are wound by overlapping each other. The first coated paper 400 and the second coated paper 500 overlap each other and are wound. In the drawing, it is shown that the first coated paper 400 is a single-sided coating, and the second coated paper 500 is a double-sided coating. It is not limited thereto, and conversely, the first coated paper may be a double-sided coating, and the second coated paper may be a single-sided coating.

The first coated paper 400 includes a substrate 402 and a coating layer 410 coated over the substrate. It is referred to as the upper coating layer 410.

The second coated paper 50 includes a substrate 502 and coating layers 510 and 520 coated on the upper and lower portions of the substrate. It is referred to as an upper coating layer 510 and a lower coating layer 520, respectively.

Except that the first coated paper is a single-sided coating in which only the upper portion of the substrate is coated, the above descriptions may be applied in the same manner.

The first and second coated papers 400 and 500 are overlapped and wound with the coated surface facing outward. In the drawing, the upper coating layer 410 of the first coated paper and the lower coating layer 520 of the second coated paper are overlapped and wound toward the outside (ie, the outer side of the bonding area). That is, the upper coating layer 410 of the first coated paper faces upward and the lower coating layer 520 of the second coated paper faces downward. On the other hand, on the other hand, the substrate 402 of the first coated paper and the upper coating layer 310 of the second coated paper are arranged to face the inside (ie, the inside of the bonding area).

Even in this arrangement relationship, overlapping sections OS1 and OS2 are formed.

That is, the portion in which the upper coating layer 510 of the second coated paper 500 is disposed to face the substrate 402 of the first coated paper 400 before being wound with a winding pipe is defined by the first overlap section OS1. I can. After being wound on the winding pipe, a portion in which the upper coating layer 510 of the second coated paper 500 is disposed to face the substrate 402 of the first coated paper 400 may be defined by the second overlap section OS2. .

And, as described above, the overlap sections OS1 and OS2 provide a space in which the coated papers 400 and 500 can be bonded to each other.

When heat corresponding to the melting temper of the coating layer is applied to the overlapping sections OS1 and OS2, the coating layers disposed between the substrates become sticky and can be bonded to each other without a separate adhesive.

10 is a diagram schematically showing coated papers wound in a paper tube manner using three coated papers according to an embodiment of the present invention. It corresponds to the above-described step (S220).

Since the above description in FIGS. 5 to 9 can be applied in the same manner, except that three coated papers instead of two coated papers are applied, the differences will be mainly looked at.

As shown in Fig. 10, three coated papers are wound by overlapping each other. The first coated paper 600, the second coated paper 700, and the third coated paper 800 overlap each other and are wound. In the drawings, all of the first to third coated papers are shown to be double-sided coating. However, the present invention is not limited thereto.

The first coated paper 600 includes a substrate 602 and coating layers 610 and 620 coated on the upper and lower portions of the substrate. It is referred to as an upper coating layer 610 and a lower coating layer 620, respectively.

The second coated paper 700 includes a substrate 702 and coating layers 710 and 720 coated on the upper and lower portions of the substrate. It is referred to as an upper coating layer 710 and a lower coating layer 720, respectively.

The third coated paper 800 includes a substrate 802 and coating layers 810 and 820 coated on the upper and lower portions of the substrate. It is referred to as an upper coating layer 810 and a lower coating layer 820, respectively.

The first and third coated papers 600 and 800 are overlapped and wound with the coated surfaces facing outward. In the drawing, the upper coating layer 610 of the first coated paper and the lower coating layer 820 of the third coated paper are overlapped and wound toward the outside (ie, the outer side of the bonding area). That is, the upper coating layer 610 of the first coated paper faces upward and the lower coating layer 820 of the third coated paper faces downward, so that the overlapping is wound. On the other hand, on the contrary, the lower coating layer 620 of the first coated paper and the upper coating layer 810 of the third coated paper are arranged to face the inside (ie, the inside of the bonding area).

The second coated paper 700 is overlapped and wound between them. That is, the upper coating layer 710 of the second coated paper faces upward and the lower coating layer 720 of the third coated paper faces downward, so that the first and third coated papers are overlapped and wound.

The first overlapping section (OS1) between coated papers before being wound with a winding pipe is formed as follows.

An overlap section OS1 is formed between the first coated paper and the second coated paper. In addition, an overlap section OS1 is formed between the second coated paper and the third coated paper.

That is, the portion in which the upper coating layer 710 of the second coated paper 700 faces the lower coating layer 620 of the first coated paper 600 before being wound with a winding pipe is defined by the first overlap section OS1 Can be. In addition, the portion in which the upper coating layer 810 of the third coated paper 800 faces the lower coating layer 720 of the second coated paper 700 before being wound with a winding pipe is defined by the first overlap section OS1 Can be.

After being wound with a winding pipe, a secondary overlap section (OS2) between coated papers is formed as follows.

That is, the portion in which the upper coating layer 710 of the second coated paper 700 faces the lower coating layer 620 of the first coated paper 600 after being wound with a winding pipe, and the upper coating layer of the third coated paper 800 A portion in which 810 is disposed so as to face the lower coating layer 720 of the second coated paper 700 may be defined by the second overlap section OS2.

As described above, the overlap sections OS1 and OS2 provide a space in which the coated papers 600 to 800 can be bonded to each other.

When heat corresponding to the melting temper of the coating layer is applied to the overlapping sections OS1 and OS2, the coating layers disposed between the substrates become sticky and can be bonded to each other without a separate adhesive.

On the other hand, in the above, the three coated papers are all double-sided coating, but it is not limited thereto, and even when at least one of them is single-sided coating, the same description as in FIGS. 8 to 9 may be applied. Do. For example, the first coated paper is a single-sided coating, and may include only a substrate and an upper coating layer. Alternatively, the third coated paper is a single-sided coating, and may include only a substrate and a lower coating layer.

In addition, in the above, the three fabrics (i.e., the uppermost fabric, the lowermost fabric, and the fabric between them) were all coated on the embodiment, but the present invention is not limited thereto, and the fabric disposed in the center does not include a coating layer. Even in the case of the original paper, the same description as in FIGS. 8 to 9 above can be applied. This is because the upper coating layer of the middle fabric can be replaced by the lower coating layer of the uppermost fabric, and the lower coating layer of the middle fabric can be replaced by the upper coating layer of the lowermost fabric.

Thus, according to the embodiment of the present invention, it is possible to manufacture a paper straw with only coating without an adhesive. Since it is not necessary to use existing adhesives such as PLA or PVAC, there is no concern that substances harmful to the human body derived from the adhesive will melt in the hot drinking water. In addition, since it does not require a separate adhesive, it has the advantage of reducing manufacturing cost.

Although the technical idea of the present invention has been specifically recorded according to the above preferred embodiments, it should be noted that the above embodiments are for the purpose of explanation and not for the limitation thereof. In addition, those of ordinary skill in the technical field of the present invention will understand that various embodiments are possible within the scope of the technical spirit of the present invention.

[Explanation of code]

100, 200, 300, 400, 500, 600, 700, 800: coated paper

102, 202, 302, 402, 502, 602, 702, 802: description

110, 210, 310, 410, 510, 610, 710, 810: upper coating layer

120, 220, 320, 420, 520, 620, 720, 820: lower coating layer

ST1, ST2: Eco-friendly paper straws

Claims (13)

Providing a coated paper coated with an acrylic-based water-dispersible coating agent for papermaking on at least one side of both sides of the substrate; Bending one end and the other end of the coated paper to overlap each other to form an overlap section; And Sealing the overlap section; containing, eco-friendly paper straw manufacturing method. The method of claim 1, The coated paper includes a first coating layer disposed below the substrate and a second coating layer disposed on the substrate, and in the overlap section, the first coating layer of one end of the coated paper is fused with the second coating layer of the other end of the coated paper, Eco-friendly paper straw manufacturing method. The method of claim 1, The paper straw extends in a first direction, The coated paper has a length in the first direction and a width in a second direction orthogonal to the first direction, The overlap section is formed over a range of 1/10 to 1/2 with respect to the width of the coated paper, eco-friendly paper straw manufacturing method. The method of claim 1, The sealing step is performed by a heat sealing method, an eco-friendly paper straw manufacturing method. The method of claim 4, The sealing step is performed by a method of pressing the overlap section at a predetermined pressure and temperature for a predetermined time, eco-friendly paper straw manufacturing method. The method of claim 5, The sealing step, using an ultrasonic irradiator or iron, eco-friendly paper straw manufacturing method. The method of claim 1, The coated paper has a basis weight of 33 ~ 162 g / m ² , eco-friendly paper straw manufacturing method. Providing two or more fabrics comprising at least one coated paper coated with an acrylic-based water-dispersible coating liquid for papermaking on at least one side of both sides of the substrate; Stacking the fabrics with each other and winding them in a paper tube method; And Containing, eco-friendly paper straw manufacturing method comprising the; step of bonding the wound fabrics to each other in the overlapping section overlapping each other. The method of claim 8, The bonding step includes a process of heating the wound fabrics, eco-friendly paper straw manufacturing method. The method of claim 9, The heating is an eco-friendly paper straw manufacturing method using a hot air. The method of claim 8, In the winding step, the first fabric and the second fabric are wound by overlapping each other, and the first and second fabrics are wound by overlapping each other so that the coated surface faces the outside of the bonding area. The method of claim 8, The coated paper has a basis weight of 33 ~ 162 g / m ² , eco-friendly paper straw manufacturing method. As an eco-friendly paper straw, Including; one or more coated papers coated with an acrylic-based water-dispersible coating solution for papermaking on at least one surface of the substrate, The one or more coated papers have an overlap section that is joined to form the shape of the straw, and the overlap section does not contain a separate adhesive.

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