WO2024072027A1 - Paper capsules for extracting beverage or coffee - Google Patents

Abstract

The present invention relates to paper coffee capsules that can be used in commercially available capsule coffee machines (compatible), can provide fresh coffee due to a strong oxygen barrier, facilitate separation for garbage collection and recycling after use, and generate less carbon than plastic or aluminum capsules.

Description

Paper capsules for beverage or coffee extraction

The present invention relates to a paper capsule for extracting beverages or coffee, and more specifically, to provide fresh coffee by ensuring oxygen barrier properties, to be easy to separate and recycle after use, and to be a plastic or aluminum capsule. This is about paper coffee capsules that reduce carbon emissions compared to other coffee capsules.

Beverages such as coffee, green tea, barley tea, and herbal tea are foods that modern people drink and enjoy every day. In particular, coffee is a beverage that adults usually drink at least one cup a day, and is extracted using espresso machines, capsule coffee, hand drip, and cold brew.

Capsule coffee, commercialized under the trademark of Nespresso (Dolce Gusto), is for one-time use. A small amount of coffee, approximately 5g to 10g or 25g, is placed in a container and placed in an extraction machine to extract the coffee at high temperature and pressure. High pressure of approximately 10 to 20 bar maintained within the capsule. By extracting coffee within minutes under high temperature conditions of over 70℃, it provides high coffee extraction yield and crema in a short period of time.

Capsule coffee that extracts coffee using pressurization and hot water is disclosed in Korean Patent No. 10-1400596 and Korean Patent Publication No. 10-2018-0108596.

Capsule coffee currently on the market uses aluminum, plastic (PP), etc. to withstand high temperature and high pressure extraction conditions and prevent oxygen penetration. In addition, capsule coffee contains aluminum lid, silver foil, and plastic at the same time, and the lid and body are heat-sealed. It is difficult to separate the lid of commercially available capsule coffee from the body (you have to cut the lid off with a knife or cut the connection between the lid and the body), and even if it is separated, aluminum lead paper remains on the top of the plastic body, so it cannot be collected separately. When these capsule coffee components are buried in the ground, it takes tens to hundreds of years to decompose, and in the sea, fish eat plastic or capsules and destroy the ecosystem, causing environmental pollution.

The consumption of coffee capsules is rapidly increasing (more than 50 billion units per year), and as a result, the amount of plastic and aluminum incinerated is also increasing proportionally. Due to the incineration of plastic, etc., not only the emission of harmful substances (dioxin, _NO It has a significant impact on change (greenhouse gas emissions).

Greenhouse gas emissions per ton of plastic reach 5 tons (Economic Review, September 26, 2021), and the carbon dioxide emission rate among incinerated waste is highest in that order: waste synthetic resin (65.3%) and waste oil (20.4%) (Korean Society of Environmental Engineers, Greenhouse gas emission coefficient and emission change due to waste incineration).

In addition, referring to the Environmental Product Declaration evaluation coefficient LDI DB, the carbon emissions of paper (1g) are 1.6488g (production 1.12g + incineration 0.5288g), and the carbon emissions of PP (1g) are 4.885g (production 1.472 + incineration 3.413g) ), low-density PE (1g) carbon emissions are 5.275g (production 1.862g + incineration 3.413g). Additionally, referring to EN+ Group data (Korea's progress toward carbon zero - transition to a low-carbon economy and the role of aluminum, 10p 2021), the carbon emission factor of aluminum (1g) is 11.4g. The carbon emission ratio of paper, PP, low-density PE, and aluminum is 1 (paper) : 2.96 : 3.2 : 6.91.

Meanwhile, an aluminum laminated film (laminated or coated with synthetic resin films such as PE and PA on both sides of aluminum) is used as a capsule lid to block oxygen and moisture. Since these aluminum laminated films are laminated with other materials of plastic and aluminum, they cannot be recycled as plastics and must be incinerated. Additionally, the unit price of aluminum is high, which is a factor in the increase in product prices.

The present invention provides paper coffee capsules that can be recycled and collected separately.

The present invention provides a paper (coffee) capsule that implements moisture barrier and oxygen barrier properties.

The present invention provides paper capsules with superior processability and productivity compared to the pulp-mold molding method.

The present invention provides a paper capsule that can reduce carbon emissions.

In one aspect, the invention

A paper capsule for extracting coffee or beverages, the paper capsule

Cylindrical housing (10) made by wrapping or folding paper sides and fusing them together;

A paper base (20) fused to the bottom of the housing;

A flat portion (C) formed by wrapping (curling) the upper end of the housing 10 in an outward direction and then compressing it; and

It includes a cover 30 fused to the upper surface of the flat portion,

The paper capsule has an internal space (B) defined by the housing, base, and cover, and the internal space (B) relates to a paper capsule filled with ground coffee or ground beverage powder.

The inventor of the present invention formed a housing by winding and fusing paper sides coated with a heat-adhesive first barrier layer without a separate adhesive, and pressurizing and fusing the base and cover (at the curling area) to the housing to form a paper capsule. The present invention was completed after discovering that the paper did not tear or the fused area spread even at the extraction pressure of 15 bar and 19 bar, which are the extraction pressures of the coffee machine.

The paper (coffee) capsule of the present invention is not a pulp-molding method or a press (pressure) molding method in which the bottom (bottom part) is formed integrally with the housing, but is made by cutting commercially available paper into a side shape and a circle, winding it, and fusing it. It is a structure in which the base and cover are joined to the housing by insertion fusion, or cover fusion. Therefore, the paper capsule method of the present invention has a very fast production speed compared to the pulp-molding method of preparing raw pulp (which contains additives such as polymers to increase adhesion), putting it in a molder, compressing it, and drying it. There are no other foreign substances (polymers, etc.) in the paper base. In addition, the paper capsule of the present invention can be fused after coating an oxygen barrier or moisture barrier film on one side of the paper, so properties such as oxygen barrier properties can be easily and quickly implemented on paper.

On the other hand, when paper is pressed and molded to manufacture an integrated tray or paper container (body with the bottom and side housing integrated), it is difficult to create a tall container structure due to the low elongation of the paper, and it is difficult to create a container structure with a large height and depth. In order to manufacture a deep container, there is a problem of having to add a polymer that can increase elongation or tensile strength during paper manufacturing (papermaking, etc.), but the present invention forms a bottom by inserting and fusing a circular paper base into the housing ( (It is not an all-in-one type, but a housing and base assembly type) It is possible to easily manufacture tall containers.

In addition, since the present invention uses paper in which a film is laminated to paper fabric, paper fabric (including film lamination) can be purchased and used as is on the market without going through a separate paper manufacturing process (pulp production, polymer addition, etc.). ) can be prepared inexpensively and easily.

Since the paper coffee capsule of the present invention coats a film (first or second barrier layer) on one side of the paper, the capsule from which the content (coffee powder) has been removed can be collected separately as paper. In addition, the fibers of the separately collected paper capsules are recovered and recycled through a dissociation process, and some of the remaining film coating portions are recovered as foreign substances during the dissociation process and can be incinerated.

The paper capsule of the present invention implements all moisture barrier properties, oxygen barrier properties, and thermal adhesive properties by laminating an oxygen barrier layer and a water resistant second barrier layer on a first barrier layer that has heat adhesiveness and water resistance, thereby making it possible to use coffee powder or beverage powder. It can be used as paper containers and lid paper that can be filled and distributed for a long time.

The paper capsule of the present invention seals the wrinkles 22 of the edge 21 generated in the process of inserting and fusing the base into the housing, thereby preventing oxygen from entering through the fine gaps in the wrinkles or coffee aroma (organic substances) from being discharged to the outside. You can block it.

Compared to existing plastic capsules (e.g., Dolce Gusto, Illy capsules, and other compatible capsule coffees) that are 100% incinerated, the paper capsules manufactured with the present invention are incinerated only about 5% to 20% and 80 to 95% are converted to paper. It can be recovered.

In addition, even when the paper capsule of the present invention is 100% incinerated, its carbon emissions are lower than existing plastic capsules (e.g., Dolce Gusto, Illy capsules, and all compatible capsule coffees manufactured domestically), making it suitable for environmental pollution and climate change. We can respond. As mentioned in the background, the carbon emission ratio of paper, PP, low-density PE, and aluminum is 1 (paper): 2.96 (PP): 3.2 (low-density PE): 6.91 (aluminum).

In addition, the paper capsule manufactured by the present invention can easily tear the cover or housing after coffee extraction (it is difficult to separate the cover or housing from the existing capsule, and even if separated, the lead paper is partially attached to the housing rim), so anyone of any age or gender can easily make coffee. The powder can be separated from the paper capsule and washed with water.

Figure 1 is a diagram of the internal structure of Dolce Gusto capsule coffee.

Figure 2 shows a method for manufacturing paper coffee capsules of the present invention.

Figure 3 is a cross-sectional view of a paper capsule manufactured by the present invention.

Figure 4 is a perspective view of the paper capsule manufactured by the present invention and an enlarged view of the paper bottom.

Figure 5 is a cross-sectional view of a paper fabric coated with a film (first barrier layer and second barrier layer).

Figure 6 shows the process of laminating a film layer to a paper substrate.

Figure 7 is an example of a method of manufacturing a base having a protruding area (a).

Figure 8 is a cross-sectional view of a paper capsule in which a base having a protruding area, a first blocking film 80, and a second blocking film 81 are installed inside the capsule.

Figure 9 shows a method of manufacturing a paper coffee capsule using a base 20 having a protruding area (a).

Figure 10 shows a method of manufacturing a paper coffee capsule including the step of inserting a first barrier film.

Figure 11 shows a method of manufacturing a paper coffee capsule including the step of inserting a second barrier film.

Figure 12 shows a perspective view and a cut surface of a paper coffee capsule in which a bottom having a protruding area (a), a first blocking film 80, and a second blocking film 81 are installed inside the capsule.

Figure 13 shows a method of manufacturing a paper coffee capsule including the step of attaching a third barrier film to the bottom of the base.

Below, preferred embodiments of the present invention will be described with reference to the drawings. However, the scope of the present invention is not limited to the description or drawings of the following embodiments. That is, the terms used in this specification are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In addition, terms such as "comprise" or "have" used in the specification are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but one or more It should be understood that this does not exclude in advance the presence or addition of other features, numbers, steps, operations, components, parts, or combinations thereof.

Figure 2 shows a method for manufacturing paper coffee capsules of the present invention, Figure 3 is a cross-sectional view of the paper capsule manufactured by the present invention, Figure 4 is a perspective view of the paper capsule manufactured by the present invention and an enlarged view of the paper bottom, Figure 5 is a cross-sectional view of a paper fabric coated with a film (first barrier layer and second barrier layer), Figure 6 shows the process of laminating the film layer to a paper substrate, and Figure 7 shows the protruding area (a). It is an example of a method of manufacturing a base provided with a base, and Figure 8 is a cross-sectional view of a paper capsule with a base provided with a protruding area, a first blocking film 80, and a second blocking film 81 installed inside the capsule, and Figure 9 shows a protruding area (a). ) shows a method of manufacturing a paper coffee capsule using a base 20 provided, Figure 10 shows a method of manufacturing a paper coffee capsule including the step of inserting a first barrier film, and Figure 11 shows a method of manufacturing a paper coffee capsule including the step of inserting a first barrier film. It shows a method of manufacturing a paper coffee capsule including the step of inserting, and Figure 12 shows a paper coffee capsule in which a bottom having a protruding area (a), a first blocking film 80, and a second blocking film 81 are installed inside the capsule. It shows a perspective view and a cut surface thereof, and Figure 13 shows a method of manufacturing a paper coffee capsule including the step of attaching a third barrier film to the bottom of the base.

2 to 13, the paper coffee capsule of the present invention includes a housing 10, a paper base 20, a flat portion C, and a cover 30.

The paper coffee capsule of the present invention can extract not only ground coffee powder but also ground beverage powder (a term referring to all solid powders that can extract beverages that humans can drink, such as tea powder and herbal tea powder). . That is, the contents of the paper capsule of the present invention may include not only ground coffee powder but also beverage powder (hereinafter, for convenience, it may be referred to as paper coffee capsule or paper capsule).

The paper coffee capsule (paper capsule) of the present invention may be a compatible capsule that can be mounted on a Nespresso machine (hereinafter referred to as an extraction machine), but is not necessarily limited thereto.

The paper coffee capsule of the present invention may be similar to the Nespresso capsule in overall shape, top cover diameter, and height. For example, a paper coffee capsule can contain about 5 to 6 g of ground coffee, the lid diameter may be around 35 mm, and the height may be 25 to 28 mm. For example, the paper coffee capsule of the present invention can extract coffee at a high temperature (70-80°C) at an extraction pressure of around 19 bar.

The paper coffee capsule of the present invention may be disposable.

The paper side 10, base 20, and cover 30 may be coated with a water-resistant and heat-adhesive first barrier layer 50 on one or both sides of the paper substrate 40. Meanwhile, the cover 30 may be made of known aluminum lead, aluminum deposition film, or synthetic paper.

3 and 5, the paper side 10, paper bottom 20, and paper cover 30 of the present invention have a water-resistant and heat-adhesive first barrier layer 50 on one or both sides of the paper substrate 40. ) or oxygen blocking film (A) can be coated or laminated.

The paper substrate is a paper fabric used for the paper side (10), base (20), and cover (30). The paper substrate 40 may be cup base paper (cardboard made of 100% bleached chemical pulp), white cardboard, special paper, or packaging paper, but is not necessarily limited thereto.

The paper substrate 40 may have a basis weight of 40 to 500 g/m2, 40 to 400 g/m2, 40 to 400 g/m2, and 40 to 360 g/m2, but is not necessarily limited thereto.

The paper substrate 40 may have a thickness of 40 to 500 μm, 40 to 400 μm, or 40 to 300 μm, but is not limited thereto.

The first barrier layer 50 may be a known film or coating layer that satisfies the conditions of water resistance and heat sealability. The first barrier layer 50 may be represented as a first barrier film.

Since the first barrier layer 50 can be melted and bonded by high-temperature heat or ultrasonic waves, the housing, base, and cover structures can be bonded without a separate adhesive.

The first barrier layer may be coated on paper at a content of 5 to 50 g/m2, 5 to 40 g/m2, 5 to 30 g/m2, 5 to 25 g/m2, and 5 to 20 g/m2, but is not necessarily limited to the above content. . The thickness of the first barrier layer may be 5 to 50 μm, 5 to 40 μm, 5 to 30 μm, or 5 to 25 μm, but is not limited thereto.

The first barrier layer may be a PE layer, a PP layer, a PET layer, a biodegradable polymer layer, or a known recycled coating layer (hereinafter referred to as a recycled coating layer).

Paper with a first barrier layer coated on one side of the paper can be collected separately with other papers (newspapers, cardboard, books, etc.) after separating the coffee powder.

The first barrier layer 50 may be laminated to one or both sides of the paper using a known adhesive. As the first barrier layer, a PE film, PP film, PET film, biodegradable polymer film, or a known eco-friendly coating film (hereinafter referred to as an eco-friendly coating layer) may be used.

For example, the biodegradable polymer layer can be coated on cup base paper and may be a layer coated with a known biodegradable paper coating that has physical properties (water resistance, non-toxicity, heat resistance, heat sealability, biodegradability) that can be used as a paper cup.

The present invention can be used by purchasing paper (cup paper) coated with a known and commercially available biodegradable paper coating agent.

For known biodegradable paper coating agents or paper containing the same, refer to Korean Patent Nos. 10-2140079 and 10-2023160. Known biodegradable paper coatings may be PLA or PBAT (Polybuthylene Adipate-co-Terephthalate)-containing coatings, and biodegradable polymer films may be PLA or PBAT (Polybuthylene Adipate-co-Terephthalate)-containing films. .

The recycling coating layer is a coating layer or film that is coated or laminated on paper and can increase the paper recycling rate above a predetermined standard by dissolving in water through a recycling process.

The recycled coating layer is a layer coated with a known eco-friendly paper coating agent that has physical properties (water resistance, non-toxicity, heat resistance, heat sealability, and biodegradability) that can be used as a cup base paper.

For example, the recycled coating agent has excellent water resistance and heat sealability, is harmless to the human body for use in food packaging paper and paper cups, can be recycled as a papermaking raw material, and can be used without limitation as long as it is a naturally degradable product. You can.

For example, the recycled coating agent may refer to Korean Publication No. 10-2020-0115936 and Korean Registration No. 10-1752340. The paper on which the recycled coating agent of the present invention is formed includes cup base paper with a recycled coating manufactured and sold by Repaper Co., Ltd., Hansol Paper Co., Ltd., Hankuk Paper Co., Ltd. (Product name: Green Shield), and Moorim Paper Co., Ltd. (Product name: Neopore). You can. Additionally, known coating agents produced and sold by Repaper, BASF, etc. can be used as the recycled coating agent.

Referring to Figure 5, the paper fabric (paper used for the paper side 10, base 20, and cover 30) may include an oxygen blocking film (A) on the paper substrate 40.

The oxygen blocking film (A) may include an oxygen blocking second barrier layer 60 and a water resistant and heat adhesive first barrier layer 50.

For example, the oxygen blocking film (A) may be a second barrier layer 60 formed on the water-resistant and heat-adhesive first barrier layer 50.

For example, the oxygen blocking film (A) may include a second barrier layer 60 sandwiched between a second barrier layer 60 and a third barrier layer 42.

Referring to FIG. 6, the paper fabric includes an adhesive layer 41 or a third barrier layer 42, the first barrier layer 50, and a second barrier layer 60 with oxygen barrier properties on a paper substrate 40. and the first barrier layer 50 may be sequentially stacked. In this case, the second barrier layer may be positioned between the two first barrier layers.

Referring to Figure 6, the method of manufacturing paper with an oxygen blocking film is

Preparing the paper substrate 40;

Preparing an oxygen blocking film (A);

It may include laminating the film to the paper substrate with an adhesive (dry lamination method) or a third barrier layer (extrusion lamination method).

The adhesive 41 may be a known film adhesive. For example, the adhesive may be a water-soluble PVA adhesive. The paper and the film can be bonded using water-soluble PVA adhesive (dry lamination).

The third barrier layer 42 may be a PE layer. Crystalline PE can be melted with T-die and used as a medium to laminate the paper substrate and the film layer. At this time, the manufacturing method of the present invention laminates one side of the paper substrate and the side of the second barrier layer 60 (of the film layer) using crystalline PE. The lamination can melt crystalline PE, coat the melted PE on the paper substrate 10, and attach the second barrier layer of the film to the surface of the paper substrate 10 coated with the melted PE. there is.

Referring to FIG. 6, the paper may be laminated on the paper substrate 40 in the order of PE as the third barrier layer 42, the second barrier layer 60, and the first barrier layer 50.

Referring to FIG. 6, the paper is composed of PE, the third barrier layer 42, the first barrier layer 50, the second barrier layer 60, and the first barrier layer 50 on the paper substrate 40. Can be stacked in order.

The thickness of the third barrier layer may be 5 to 50 μm, 5 to 40 μm, 5 to 30 μm, or 5 to 25 μm, but is not limited thereto.

The second barrier layer includes a film layer or coating layer containing ethylene vinyl alcohol (EVOH), a film layer or coating layer containing polyvinylidene chloride (PVDC, polyvinylidene chloride), a nylon film layer, and polyvinyl alcohol (PVOH, polyvinyl alcohol). ) It may be any one of a containing film layer, a coating layer, an aluminum deposition film layer, or a coating layer. The second barrier layer may be ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVDC), a nylon resin layer, or a thin aluminum layer, which are known to have excellent oxygen barrier properties.

For example, the oxygen blocking film (A) may be an ethylene vinyl alcohol (EVOH), polyvinylidene chloride (PVDC) or nylon resin layer, or a thin aluminum layer coated on the PE layer, which is the first barrier layer, preferably The film may be a polyvinyl alcohol (PVOH, polyvinyl alcohol)-containing layer coated on a PE layer. The polyvinyl alcohol (PVOH)-containing layer may be a coating agent mixed with water and polyvinyl alcohol (PVOH) and silane having an epoxy group. For the PVOH oxygen barrier layer coated on PE, refer to Korean Patent No. 10-1912894.

Additionally, the oxygen blocking film (A) may be commercially available PE/EVOH/PE, PE/nylon/PE, PE/aluminum/PE, PE/aluminum deposition layer/PE, or PE/PVOH/PE. When using PE/EVOH/PE, etc. as the oxygen blocking film (A), the oxygen blocking film (A) can be laminated on a paper substrate using a dry lamination method using the adhesive 41, and similarly, crystalline PE can be melted with a T-die and used as a medium to laminate the paper substrate and the oxygen barrier film (A).

The thickness of the second barrier layer may be 1 to 10 μm, 1 to 5 μm, or 1 to 3 μm, but is not limited thereto.

The housing 10 is perforated at the top and bottom, and a small amount of ground coffee powder can be filled therein.

The housing 10 is manufactured by wrapping paper coated with a water-resistant and heat-adhesive first barrier layer on the inside and fusing the overlapped sides. The overlap portion can be fused without a separate adhesive by using the first barrier layer 50 coated on the side.

The paper base 20 may be inserted into the bottom of the housing and fused.

Referring to FIGS. 2 to 4, the paper base 20 is positioned at a predetermined interval between the border 21 and the border area, which is formed by folding the circularly cut paper upward in the process of inserting it into the bottom of the housing. It is provided with a folded portion 22 in which a portion of is overlapped.

Referring to FIG. 4, multiple wrinkles 22 are inevitably generated during the process of folding the bottom portion upward.

The edge portion 21 may be made of paper fabric folded upward and fused to the inside of the housing.

Referring to the enlarged view of FIG. 4, the wrinkle portion 22 of the paper base 20 is an area formed by folding and overlapping the paper of the edge portion 21.

The outer surface of the edge 21 and the outer surface of the wrinkle portion may be bonded to the housing by being pressed and heat-sealed to the inner surface of the housing.

More specifically, as shown in Figures 2 and 9, when the paper base is lowered inside the housing using a cylinder, the edges and wrinkles are formed by the compressing force of the cylinder, and at the same time, it is pressed toward the housing and fused to the inner surface of the housing. You can. At this time, the paper base 40 forming the paper base can be pressed by the compressing force of the cylinder, so that the edge portion and wrinkle portion can be pressed with a reduced thickness and fused to the housing.

Referring to FIG. 4, the pleated portion 22 is an area where the paper surface of the taduri is folded and overlapped, and the coffee flavor may be lost to the outside or external oxygen may be introduced due to the fine gaps 22a and 22b of the folded pleated portion.

The present invention may include a method of forming the base on a paper capsule.

Referring to Figure 2, the method of forming a paper base includes the steps of punching out cut paper for base 20 (paper with a first barrier layer or oxygen blocking film formed on a paper base), and inserting the paper into the housing. , It may include the step of pressing and heat-sealing the border (including the wrinkles formed on the border) formed by inserting it into the housing to the outside (housing paper surface) at the same time.

The paper capsule of the present invention is made by compressing the edge portion and the wrinkle portion 22 to the outside (housing paper surface) and simultaneously applying heat to form a first barrier layer or an oxygen barrier film on the inner surface of the housing (a first barrier layer on the outer surface). provided) can be used to join the edge portion and the wrinkle portion to the housing. At this time, the wrinkle part may be in close contact with the housing side as shown in FIG. 4.

Referring to Figure 4, the first barrier layer of the paper base (or the first barrier layer of the outer surface of the oxygen blocking film) can be used to bond the fine gaps 22a and 22b of the overlapped wrinkles. However, when the first barrier layer is formed only on the inner surface of the wrinkles of the paper base, it is difficult to completely seal 22b even if the fine gap 22a can be sealed.

For example, for bonding the partial section 22a of the wrinkles, the thickness of the first barrier layer is 15 to 50 g/m2, preferably 20 to 50 g/m2, and more preferably 25 to 50 g/m2. You can.

If the thickness of the first barrier layer is less than 15 g/m2, the adhesive strength is reduced, making it difficult to seal the fine gaps 22a and 22b. However, even when the thickness of the first barrier layer exceeds 15 g/m2, it is necessary to control the fusion temperature and time so that the first barrier layer is sufficiently melted.

Meanwhile, the paper capsule of the present invention has a protruding area (a) on the paper bottom without having to consider conditions such as whether the first barrier layer is coated on both sides, thickness, fusing temperature and time, thereby preventing wrinkles generated when joining the bottom. The minor gaps 22a and 22b can be sealed.

Referring to FIG. 7, the protruding area (a) of the paper base is a film surface where the first barrier layer 50 or the oxygen blocking film (A) protrudes further outward than the outer periphery of the paper substrate 40.

The protruding area (a) of the paper base does not exclude the first barrier layer 50, the oxygen blocking film (A), or the paper on which the film is formed. For example, the paper may be paper used for the housing, base, and cover described above.

Referring to a in FIG. 7, a water-resistant and heat-adhesive first barrier layer 50 may be laminated on one side of the paper substrate 40. In this case, the (outer) diameter of the first barrier layer 50 is larger than the (outer) diameter of the punched paper substrate 40, and the first barrier layer 50 and the paper substrate 40 are laminated. In this case, the first barrier layer 50 has a protruding area (a) that is more exposed to the outside than the outer periphery of the paper substrate.

Referring to Figure 7b, the oxygen blocking film (A) may be laminated on one side of the paper substrate 40 on which the first barrier layer 50 is formed. The oxygen blocking film (A) may be the oxygen blocking film described above. The (outer) diameter of the oxygen blocking film (A) is larger than the (outer) diameter of the punched paper base 40, and when the oxygen blocking film (A) and the paper base 40 are laminated, the oxygen blocking film (A) has a protruding area (a) that is more exposed to the outside than the outer periphery of the paper substrate.

Referring to c in FIG. 7, an oxygen blocking film (A) may be laminated on one side of the paper substrate 40. The (outer) diameter of the oxygen blocking film (A) is larger than the (outer) diameter of the punched paper base 40, and when the oxygen blocking film (A) and the paper base 40 are laminated, the oxygen blocking film (A) has a protruding area (a) that is more exposed to the outside than the outer periphery of the paper substrate.

Referring to d in FIG. 7, the first barrier layer 50 or the oxygen blocking film (A) may be laminated on the lower surface of the paper substrate 40. The (outer) diameter of the oxygen blocking film (A) or the first barrier layer 50 is larger than the (outer) diameter of the punched paper substrate 40, and the oxygen blocking film (A) or the first barrier layer ( When 50) and the paper substrate 40 are laminated, the oxygen blocking film (A) and the first barrier layer 50 have a protruding area (a) that is more exposed to the outside than the outer periphery of the paper substrate. As shown in Figure 7d, an oxygen blocking film or a first barrier layer may be attached to the lower surface of the paper substrate.

Referring to FIGS. 9 and 8A, the paper base 20 having a protruding area (a) manufactured in FIG. 7 is a protruding area of the first barrier layer 50 or the oxygen blocking film layer (A). As (a) is fused across the edge portion 21 and the inner surface of the housing 10, the fine gaps 22a and 22b of the wrinkle portion can be completely sealed.

In addition, referring to FIGS. 7 to 9, the method of forming a paper base includes punching a paper substrate 40 and punching films 50 and 60 (oxygen blocking film or polymer film) to be larger than the cut paper cross-section. releasing step, attaching the film on or below the paper, inserting the paper with the film attached into the housing, simultaneously pressing the border (including the wrinkles formed on the border) to the outside (paper surface of the housing) It may include a heat fusion step.

In addition, the method of forming a paper base includes forming a paper border after attaching the film on or below the paper, inserting the paper on which the paper border is formed into the housing, and forming the border (including the wrinkles formed on the border). ) may include the step of pressing and heat-sealing the material to the outside (paper side of the housing).

The paper border forming step may be a step of forming a border around the edge of the paper by pressing the paper into a mold.

For example, in the paper base forming method, the films 50 and 60 (oxygen blocking film or polymer film) can be punched 2 to 20 mm larger than the diameter of the cut paper.

For example, a polymer film (for example, the oxygen blocking film (A) or the first barrier film 50) and paper can be heat-sealed or bonded using an adhesive.

A cylinder can be inserted into the housing, and the edges and wrinkles can be heat-compressed while rotating the cylinder by pressing it in an outward direction.

Referring to FIGS. 10 to 12, the paper capsule is located inside the housing and includes a first blocking film 80 and a second blocking film ( 81) may be included.

Referring to FIG. 13, the paper capsule may include a third blocking film 82 that covers the bottom and bottom of the housing and closes the fine gaps in the wrinkle area.

The first to third blocking films are

The first barrier layer or oxygen blocking film may be a paper blocking film or synthetic paper formed on a paper substrate, a polymer film having heat adhesiveness, or the oxygen blocking film (A).

The first barrier layer or oxygen blocking film may be the film or coating layer described above.

The synthetic paper may be a paper synthetic paper in which a known film and paper are laminated, or it may be a synthetic paper in which the top and bottom layers are film layers.

Polymer films that can be used as the first to third barrier films may be PE, PP, PET, or polyurethane films, but are not necessarily limited thereto.

The first blocking film 80 is a second housing (cylindrical with upper and lower perforations) structure in which the second side edge 80 is wrapped and the overlap portion is fused, and the outer surface is the inner surface of the housing 10 and the surface of the edge 21. It is closely adhered and fused.

Referring to FIGS. 8B and 10 , the method of inserting the first blocking film 80 includes cutting the paper fabric and punching out a fan-shaped second side edge 80, and winding the second side edge 80. It may include forming a cylindrical first oxygen blocking film 80 by folding or folding it and fusing the overlap portion, and inserting the first blocking film to the bottom inside the housing and then fusing it.

In the fusion step, the bottom surface of the first blocking film 80 and the bottom 20 of the housing in close contact with it can be fused.

Since the first blocking film 80 is fused in close contact with the edge portion 21 and the inner surface of the housing, it can block fine passages through which gas generated in the wrinkle portion 22 of the base can flow in and out.

The second side finger 80 may be the same as or similar to the side finger 10. The length (S2) of the second side limb may be the same as the length of the side limb (S1) or may be as small as the thickness of the side limb (10). The height H2 of the second side leg may be equal to or smaller than the height H1 of the side leg. For example, the height (H2) of the second side edge may be greater than the height of the edge (21) of the side edge and may be 1/2 to 1/3 of the height (H1) of the side edge.

The inclination angle θ2 of the second side arm 80 may be equal to or smaller than the inclination angle θ1 of the side arm 10. For example, the inclination angle θ2 of the second side arm 80 may be 0.01° to 5° smaller than the inclination angle θ1 of the side arm 10.

Referring to FIGS. 8C and 11 , the paper capsule may include a second blocking film 81 that is attached to the upper side of the base and the inside of the housing and covers the base edge portion 21.

The paper capsule manufacturing method may include manufacturing a housing, inserting and fusing the base, and inserting the second blocking film 81 and fusing it to the upper surface and edge surface of the base.

The second blocking film 81 may be the same size or larger than the paper base 20, and preferably, the second blocking film 81 may have a larger diameter than the paper base 20.

The second blocking film 81 may be cut into a circular shape similar to the base. The second blocking film is lowered into a cylinder, etc., and the edge portion is folded upward, and the edge portion covers the edge 21 and the wrinkle portion 22 of the paper base and is fused. The central portion of the second blocking film may be fused to the base (bottom surface).

The second blocking film may be circular, or may be donut-shaped with a central portion perforated.

Referring to FIG. 12, the protruding area (a) of the base, the first blocking film 80 and the second blocking film 81 are located inside the housing, and are pressed and fused by covering the edges and wrinkles of the base from the outer surface. . That is, the protruding area (a) of the base, the first blocking film 80, and the second blocking film 81 can block the fine passage formed in the wrinkle part 22 of the base.

Referring to FIG. 13, the paper capsule may be provided with a third blocking film 82 that covers the bottom and bottom of the housing and closes the fine gaps in the wrinkle area.

The third blocking film 82 may have the same diameter as the outer periphery of the bottom of the housing. The third blocking film 82 may be fused to cover the lower edge of the base 20. The third blocking film can cover both the bottom of the base and the edge to prevent the wrinkles of the base from being exposed to the outside of the housing. The third blocking film 82 blocks the lower side of the wrinkled portion 22 of the border 21 formed at the bottom, thereby preventing gas from being discharged or oxygen from entering the outside of the housing.

Ground coffee may be filled in the upper part of the paper base 20.

The flat portion C is formed by wrapping the top of the housing 10 outward (curled) or rounded outward and then compressed. Since the flat portion (C) is plate-shaped, the contact area with the paper cover is larger compared to the curled case, thereby improving adhesion.

The paper cover (lid) 30 may be fusion-bonded to the flat portion (C).

Although the present invention has been described in detail above by taking preferred embodiments of the present invention as examples, this description merely describes and discloses exemplary embodiments of the present invention. Those skilled in the art will readily recognize that various changes, modifications and variations can be made from the above description and accompanying drawings without departing from the scope and gist of the present invention.

The present invention can be used as a capsule for coffee extraction.

Claims (10)

1. A paper capsule for extracting coffee or beverages, the paper capsule

   Cylindrical housing (10) made by wrapping or folding paper sides and fusing them together;

   A paper base (20) fused to the bottom of the housing;

   A flat portion (A) formed by wrapping (curling) the upper end of the housing 10 in an outward direction and then compressing it; and

   It includes a cover 30 fused to the upper surface of the flat portion,

   The paper capsule is characterized in that an internal space (B) defined by the housing, base, and cover is formed, and the internal space (B) is filled with ground coffee or ground beverage powder.
2. The paper capsule according to claim 1, wherein the cover (30) is made of paper, aluminum lead, aluminum vapor deposition film, or synthetic paper.
3. The method of claim 1, wherein the paper side (10), bottom (20), and cover (30) have a water-resistant and heat-adhesive first barrier layer (50) formed on one or both sides of the paper substrate (40). paper capsule.
4. The method of claim 1, wherein the paper side (10), bottom (20), and cover (30) include an oxygen blocking film (A) formed on one or both sides of the paper substrate (40),

   The oxygen blocking film (A) includes an oxygen blocking second barrier layer 60 and a water resistant and heat adhesive first barrier layer 50.

   The oxygen blocking film (A) is a paper capsule characterized in that an oxygen blocking second barrier layer (60) is sandwiched between a water-resistant and heat-adhesive first barrier layer (50) or a third barrier layer (42).
5. The method according to any one of claims 1 to 4, wherein the paper base (20) is formed by folding the paper cut in a circular direction upward in the process of inserting it into the bottom of the housing. It has wrinkles (22) positioned at intervals and part of the border is overlapped,

   A paper capsule, characterized in that the outer surface of the border (21) and the outer surface of the wrinkles are bonded to the housing by being pressed and heat-sealed to the inner surface of the housing.
6. The method of claim 5, wherein the pleated portion 22 is compressed and then fused to the first barrier layer 50 formed on the base 20 to seal the fine gap 22a of the pleated portion 22. A paper capsule made of.
7. The method of claim 5, wherein the paper base (20) includes a water-resistant and heat-adhesive first barrier layer (50) or an oxygen barrier film (A) laminated on one or both sides of the paper substrate (40),

   The outer diameter of the first barrier layer 50 or the oxygen blocking film (A) is formed to be larger than the outer diameter of the punched paper substrate 40, so that the first barrier layer 50 or the oxygen blocking film (A) When the paper substrate 40 and the first barrier layer 50 or the oxygen blocking film (A) are laminated, the first barrier layer 50 or the oxygen blocking film (A) has a protruding area (a) that is more exposed to the outside than the outer surface of the paper substrate,

   A paper capsule, wherein the protruding area (a) is fused to the edge (21) and the inside of the housing to seal the fine gap (22a) of the wrinkle portion (22).
8. The method of claim 5, wherein the paper capsule includes a first blocking film (80) located inside the housing, covering the edge (21) and sealing the fine gap of the pleated portion (22),

   The first blocking film is

   A paper barrier film or synthetic paper in which the first barrier layer or oxygen barrier film is formed on a paper substrate

   A paper capsule, characterized in that it is a heat-adhesive polymer film or the oxygen blocking film (A).
9. The method of claim 5, wherein the paper capsule is attached to the upper side of the base and the inside of the housing and includes a second blocking film (81) covering the base edge portion (21),

   The second blocking film is

   A paper barrier film or synthetic paper in which the first barrier layer or oxygen barrier film is formed on a paper substrate

   A paper capsule, characterized in that it is a heat-adhesive polymer film or the oxygen blocking film (A).
10. The method of claim 5, wherein the paper capsule includes a third blocking film (82) that covers the bottom of the housing and the bottom of the base to block the fine gaps in the wrinkle area,

    The third barrier is

    A paper barrier film or synthetic paper in which the first barrier layer or oxygen barrier film is formed on a paper substrate

    A paper capsule, characterized in that it is a heat-adhesive polymer film or the oxygen blocking film (A).

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