WO2014098097A1 - Extraction bag - Google Patents

Abstract

An extraction bag (5) for a beverage or the like is provided, with which discharge of an enclosed edible powder during non-extraction of the beverage or the like can be inhibited, and with which, during extraction, the edible powder can be easily discharged and dispersed or dissolved in the beverage or the like. In this extraction bag (5), a substance to be extracted and an edible powder are enclosed in a bag main body (6) provided with a multilayer filter (1) in which a thin-film sheet (2) having, provided therein, cuts (4) piercing a rear surface thereof is provided overlapping a coarse fibre sheet (3) not having cuts provided therein. The bag main body (6) is sealed using a sheet-like or linear seal part (S), and does not substantially have a crease formed at an edge (Sa) of the seal part.

Description

Bag for extraction

The present invention relates to an extraction bag suitable for extracting beverages and the like.

Green tea, which is carefully extracted from high-quality tea leaves with hot water using a teapot, is known to have a deep aroma, good bitterness and deliciousness. Moreover, the green tea carefully extracted in the teapot has a little turbidity because it contains fine powder of tea leaves, but the fine powder of tea leaves is said to be a factor in the taste of green tea.
However, extracting green tea using a teapot requires time and effort to dispose of the tea leaves after extraction and washing the teapot. As a product that can extract green tea more easily, fiber filters such as natural fibers and synthetic fibers can be used. 2. Description of the Related Art An extraction bag generally called a tea bag, in which tea bags are made and sealed with tea leaves, is known.

However, extraction with a conventional extraction bag has made it difficult to produce green tea that exhibits moderate turbidity as extracted with a teapot.
In other words, in order to impart turbidity to green tea, when extracting the green tea by immersing the extraction bag in hot water, an appropriate amount of tea leaf powder should be leaked and included in the green tea. As a filter, a method using a coarse filter can be considered. However, when a coarse fiber filter is used, the fine powder of tea leaves passes through the coarse fiber filter to the outside during the process of packaging the extraction bag enclosing tea leaves in an exterior bag or during the transportation of the extraction bag. Leakage and raw material loss, and the packaging device for the extraction bag is soiled, causing failure, and the tea bag product is not good-looking with a lot of fine tea leaves adhering to the outer surface of the extraction bag. Inconvenience occurs.

Therefore, many of the commercially available extraction bags are made with fine fiber filters to prevent leakage of fine tea leaf powder, so it is difficult to extract green tea with moderate turbidity. It is.
Under such circumstances, when extracting green tea, the tea leaf fine powder can be leaked and included in the green tea, and when not extracted such as during packaging or transportation, the extraction can prevent leakage of the tea leaf fine powder. Bags are desired.

In addition, similar to the above green tea, there are tea and coffee as beverages in which extraction bags are frequently used. When drinking these teas and the like, seasonings such as sugar and creaming powder are often added to adjust the flavor, and spices such as cinnamon and various herbs are often added to impart a characteristic flavor. Thus, when adding a seasoning etc. to black tea etc., first, the method of making an extraction bag soak in hot water, extracting black tea etc., adding an appropriate amount of seasoning etc., stirring, and dissolving or dispersing is carried out. It is common.

However, when extracting tea etc. from the bag for extraction, it is convenient if the seasoning etc. can be dissolved or dispersed at the same time. For that purpose, the seasoning etc. together with the tea leaves etc. of tea in advance in the tea bag. A method of enclosing an appropriate amount of fine powder is conceivable. In the case of such a method, the seasoning, etc. sealed together with tea etc. in the extraction bag must be dissolved or dispersed in a short time during the extraction time of tea etc., so the particle size should be as small as possible. However, it is easy to leak outside through the fiber filter eye of the extraction bag, so the packaging device of the extraction bag may be soiled by the leaked seasoning, etc., or the outer periphery of the extraction bag There is a disadvantage that a lot of seasonings or the like adhere to the surface.
Therefore, it is possible to dissolve fine powders such as seasonings in a short time when extracting tea or the like, and to prevent leakage of fine powders such as seasonings when not extracted during packaging or transportation. It is convenient if there is a bag for use.

As a prior art relating to an extraction bag, Japanese Patent Application Laid-Open No. 2006-143258 (Patent Document 1) discloses that a water-soluble polymer compound such as polysaccharides and gelatin is attached to a filter made of nonwoven fabric, etc. A closed tea bag filter is described. This filter for tea bags can prevent leakage of fine tea leaf powder enclosed in the tea bag because the fiber gap is closed in the dry state before use, and the tea bag is immersed in hot water during use. In this case, since the water-soluble polymer compound that has blocked the fiber gap of the filter is dissolved in hot water, the fiber gap of the filter is opened, and the tea leaf fine powder can be leaked to the outside.
However, in this tea bag filter, the water-soluble polymer compound that has entered the fiber gap of the filter is difficult to dissolve, and the water-soluble polymer compound such as gelatin that becomes viscous when dissolved dissolves the texture and flavor of the beverage. There is a risk of damage.

Japanese Patent Application Laid-Open No. 2009-60826 (Patent Document 2) discloses a method for filling and sealing tea leaf fine powder having a controlled particle size into a flat tea bag having a specific thickness, and including a plurality of flat tea bags. Flat tea bags that can be made to leak tea leaf powder from the tea bag during transportation by stacking and wrapping in a packaging bag, and to allow tea leaf powder to leak out when the tea bag is immersed in water during extraction And its packaging.
However, the technique described in Patent Document 2 presses the flat tea bags in surface contact with each other and suppresses the movement of the fine tea leaf powder in the tea bag, thereby reducing the fine tea leaf from the tea bag during transportation. Since the leakage of the powder is reduced, for example, in the tea bag manufacturing process, when the tea bag enclosing the tea leaf fine powder is packaged in the packaging bag, the leakage of the tea leaf fine powder cannot be prevented. There's a problem.

In addition, US Pat. No. 2,157,656 (Patent Document 3) discloses a purse-like shape in which tea leaves and coffee beans are wrapped with a filter in which a paper layer with slits penetrating the front and back and a rough cloth layer are overlapped. A tea bag or a coffee bag molded in the above is described (FIGS. 1 to 7). This tea bag or the like is provided with a slit at the bottom of the paper layer where it is difficult for hot water to pass through, so that hot water can easily enter and exit the bag, so that the extraction time for tea or the like can be shortened.
However, since the tea bag described in Patent Document 3 is sealed by lifting the peripheral edge of the rectangular filter upward and binding it together, the filter forming the bag has a large number of vertical gutters. In particular, the area around the bound portion is greatly deformed. Accordingly, the mutual adhesion between the paper layer and the fabric layer that overlap each other to form a filter is greatly impaired, and the function of supporting the paper layer in contact with the surface from the outside does not work sufficiently. It is not possible to prevent the slit from expanding due to the deformation of the layer. Therefore, there is a problem that tea leaves and the fine powder thereof leak out from the widened slit when packaging or transporting tea bags.

JP 2006-143258 A JP 2009-60826 A US Pat. No. 2,157,656 (US2157656A)

Therefore, the present invention has been made in view of the above-mentioned problems, and when the extraction bag is not extracted, such as when it is packed or transported, edible powder such as fine powder of extractables or fine powder of seasoning. It is an object of the present invention to provide an extraction bag that can prevent leakage of the body and that can be easily leaked by dispersing or dissolving edible powder in a beverage or the like during extraction of the beverage or the like.

Of the present invention for solving the above-mentioned problems, the invention described in claim 1 is an extraction bag in which an extractable substance and edible powder are enclosed in a bag body including an extraction filter. And at least a part of the extraction filter is formed by a multiple filter formed by laminating a thin-film sheet with cuts penetrating the front and back and a coarse fiber sheet without cuts, and the bag body has a surface. The bag for extraction is characterized in that it is sealed by a linear or linear seal portion, and the crease is not substantially formed on the edge of the seal portion.

An extraction object and edible powder are enclosed in the bag body of the extraction bag. Here, the to-be-extracted substance is one that can be obtained by immersing a component in a liquid such as hot water or water to elute the contained component into the liquid. For example, when the extract is green tea or black tea, the extract is green tea or tea leaves, and when the extract is coffee, the extract is roasted coffee beans. .
The extract is generally a beverage such as green tea, black tea or coffee, but also includes foods such as soup and soup, and medicines such as Chinese herbal extracts.
The extract enclosed in the bag body is about several mm to several tens of mm in order to obtain a larger amount of extract from a small amount of extract and to shorten the extraction time. It is preferable to grind it.

In addition, edible powders are those that can be dispersed or dissolved in an extract extracted from an extract to give a variety of flavors and aromas to the extract. For example, if the edible powder is green tea powder when the extract is green tea, the green tea can be given a deep fragrance and moderate bitterness, and if the extract is coffee, the edible powder is If sugar fine powder is used, sweetness can be imparted to coffee.
The edible powder enclosed in the bag body is preferably a fine powder having a particle size as small as possible in order to disperse or dissolve in the extract in a short time. It may be a granulated granule.

The bag body of the extraction bag of the present invention has an extraction filter that has liquid permeability and can extract an extract such as a beverage from various extracts, and at least a part of the extraction filter. Is an extraction filter (multiple filter) having a multiple structure formed by superposing thin film sheets with cuts penetrating the front and back and coarse fiber sheets without cuts.
Therefore, the bag body of the extraction bag may be formed entirely by a multiple filter, or may be formed by combining a multiple filter and another extraction filter. In addition to these extraction filters, a sheet portion that is not an extraction filter may be provided.

The thin film sheet of the multiple filter in the present invention is a thin sheet made of a material that is difficult to pass or does not pass edible powder such as fine powder of the extract or fine powder of seasoning, for example, woven cloth, A sheet made of a fiber material such as non-woven fabric, paper, etc., and has a small fiber gap, so that it is a fine fiber sheet that has liquid permeability but edible powder is difficult to pass through, or edible powder without liquid permeability. It is a film-like sheet made of a synthetic resin film that does not pass through the body.
The coarse fiber sheet is a sheet made of a fiber material such as woven fabric, non-woven fabric, and paper, and has a relatively large fiber gap, so that it has liquid permeability and can pass edible powder. However, extractables such as tea leaves are difficult to pass through.

The above thin film sheet has a notch penetrating the front and back. Since the material constituting the thin film sheet is difficult to pass edible powder as described above or does not pass at all, it is difficult for the edible powder to pass through the thin film sheet if the incision is closed. If the cut is in an expanded state, the edible powder can easily pass through the expanded portion.

In addition, the multiple filter is an aspect in which the thin film sheet and the coarse fiber sheet are simply overlapped and are not adhered to each other. For this reason, the coarse fiber sheet that is not cut is supported in a state where it is entirely or partially in surface contact with the thin film sheet that is cut (hereinafter, also simply referred to as “surface contact state”). It has become.

When the multiple filter maintains such a “surface contact state”, various physical actions applied to the thin film sheet from the outside are alleviated by the coarse fiber sheet. The incision that is present remains substantially closed.
For example, even when the extraction filter of the present invention is packaged or transported, the coarse fiber sheet becomes a thin film sheet even when the multiple filter is pressed and deformed against an object to be extracted enclosed in the extraction bag. Since it supports in surface contact, the degree of deformation of the thin film sheet is reduced, and the notch is difficult to expand and is maintained in a substantially closed state. Therefore, leakage of the edible powder sealed in the bag body can be suppressed.

Therefore, when the extraction bag of the present invention is not extracted, in order to prevent leakage of the edible powder enclosed in the bag body, the multiple filter may be in a “surface contact state”. It is necessary to spread the thin film sheet of the filter and the coarse fiber sheet so that they are both unfolded and overlap. This is because if either or both of the sheets have creases, the sheets are separated from each other at the crease portion, and the surface contact state may be impaired.

In particular, when the bag body of the extraction bag of the present invention is sealed with a planar or linear seal portion to form a bag, if a fold is formed on the edge of the seal portion, the fold is Since it is fixed by the seal portion, the thin film sheet of the multiple filter and the coarse fiber sheet may be permanently separated in the peripheral portion of the fold.
Therefore, when making the bag body, it is necessary to perform a sealing operation so as not to form creases on the edge of the planar or linear seal portion.

Here, as a sealing method using a planar seal portion, for example, a method in which two multiple filters are overlapped and then sandwiched with a heat seal bar to form a planar seal portion and welded, or an adhesive Alternatively, there is a method of forming and bonding a planar seal portion using an adhesive tape.
In addition, as a sealing method using a linear seal portion, for example, after superposing two multiple filters, a linear seal portion is formed and welded while being melted by applying ultrasonic waves or laser light. There are methods.

In the present invention, it is necessary that “the crease is not substantially formed” on the edge of the seal portion. For example, the heat of the multi-filter may be slightly shrunk or deformed by heating when forming the seal portion, and a fine wrinkle may be generated on the edge of the seal portion. Since it does not adversely affect the surface contact state, it does not correspond to the “folding crease” referred to in the present invention, and the state of the edge of the seal portion where only such a minute crease exists is “substantially a crease is formed. It can be said that there is no state.

In order to extract a beverage or the like with the extraction bag of the present invention, for example, a bag body in which an extractable substance and edible powder are enclosed may be immersed in hot water or water. Then, hot water or water flows into the bag body. At that time, since hot water or water has a large specific gravity and generates resistance, the notch expands when they pass while expanding the notch of the thin film sheet. Therefore, the edible powder in the bag body is dispersed or dissolved in the flowing hot water or water, and when the hot water or water flows out of the bag body through the notch expanded by convection, It will leak together.
In addition, since a comparatively large extract cannot pass a coarse fiber sheet, it does not leak from a bag main body irrespective of opening and closing of the cut | notch of a thin film sheet.

Next, the invention according to claim 2 of the claims is characterized in that the edible powder sealed in the bag body is a fine powder of the extraction object. It is.

For example, when the beverage or the like extracted from such an extraction bag is green tea, if the edible powder is a fine powder of tea leaf that is the extractable substance, the fine tea leaf powder is dispersed in the green tea and has a deep fragrance. A moderate bitterness can be imparted. At that time, if the particle size of the fine powder of the extract such as tea leaves is 500 μm or less, it can be quickly dispersed, which is preferable.

Next, the invention described in claim 3 of the claim is characterized in that the edible powder sealed in the bag body is a fine powder or granule of seasoning or spice. This is an extraction bag.

For example, when the beverage or the like extracted from the extraction bag is coffee, if the edible powder is a fine powder of sugar, which is a seasoning, the sugar fine powder is dissolved in the coffee to give sweetness. Can do. At that time, if the particle diameter of the fine powder of seasoning such as sugar is 1000 μm or less, it can be dissolved quickly, which is preferable.
Furthermore, the granule which collected the fine powder of the said seasonings, such as the above-mentioned sugar, and solidified in the shape of a granule may be sufficient. This is because the granule is an aggregate of the fine powder particles and is porous, so that it can be quickly dissolved in a beverage or the like, regardless of the size of the granule itself. For example, sugar granules (frosted sugar) can be manufactured by granulating sugar fine powder into a granule with a general granulator, and can be quickly dissolved in beverages, etc., like the raw sugar fine powder. It is something that can be done.
If the edible powder is a fine powder of cinnamon that is a spice, the fine powder of cinnamon can be dispersed in coffee to give a characteristic flavor. At that time, it is preferable that the fine powder of spices such as cinnamon has a particle size of 500 μm or less because it can be quickly dispersed.

Next, in the invention described in claim 4 of the claims, the multiple filter is characterized in that the thin film sheet and the coarse fiber sheet are overlapped and partially bonded. Bag.

The partial adhesion between the thin film sheet and the coarse fiber sheet of the multiple filter may be performed by partially bonding the opposing surfaces of the overlapped sheets by spotting or wire-bonding. It is desirable to arrange the cuts attached to the positions and sizes so as not to hinder the spreading operation when extracting beverages or the like. This is because, depending on the position and size of the bonding location, the degree of freedom in operation of the peripheral portion of the thin film sheet cut may be hindered, and the expansion operation may be difficult.
In addition, the method of partial adhesion between the thin film sheet and the coarse fiber sheet is not particularly limited. For example, when both sheets are made of a thermoplastic resin material, the laminated sheets can be partially welded by hot embossing. it can. It is also possible to perform partial adhesion by partially applying and pressing an adhesive between both sheets.

Next, the invention described in claim 5 is characterized in that the thin film sheet of the multiple filter is disposed on the inner surface side of the bag body, and the coarse fiber sheet is disposed on the outer surface side of the bag body. An extraction bag according to any one of claims 1 to 4.

The back body of such an extraction bag is a coarse fiber sheet in which a thin-film sheet with cuts is arranged on the inner surface side that comes into contact with an object to be extracted enclosed in the bag body, and the outer surface side is not cut. Therefore, the coarse fiber sheet is in a state of supporting the thin film sheet in surface contact with the whole or part so as to cover from the outside.

Therefore, when extracting a beverage or the like with the extraction bag, for example, if the bag body is immersed in hot water or water, the hot water or water flows into the bag body, but the inner side thin film sheet is rough on the outer side. Since it is located downstream of the fiber sheet with respect to the flowing direction of hot water or water, it is difficult to receive a support action by the coarse fiber sheet. Therefore, the cut of the thin film sheet is easily expanded by the flowing hot water or water, so that the edible powder easily leaks to the outside.

According to the extraction bag according to claim 1, unextracted beverages or the like when packaging with the outer packaging material of the extraction bag enclosing the extractable substance and edible powder, or when the extraction bag is transported Sometimes leakage of edible powder can be suppressed. Therefore, there is no loss of raw materials due to leakage of edible powder, and it is difficult to soil the packaging device for the extraction bag or the outer peripheral surface of the extraction bag.
Furthermore, according to such an extraction bag, edible powder can be easily dispersed or dissolved to be leaked when a beverage or the like is extracted. Therefore, for example, green tea in which tea leaf fine powder is dispersed to improve the flavor, coffee in which sugar is dissolved and sweetened, etc. can be easily and quickly made.

According to the extraction bag described in claim 2, for example, when extracting green tea with an extraction bag, the tea leaf fine powder can be easily and quickly dispersed in green tea simply by immersing the bag body in hot water or water. Thus, the flavor of green tea can be improved.

According to the extraction bag described in claim 3, for example, when coffee is extracted with an extraction bag, seasoning such as sugar can be easily and quickly added to the coffee simply by immersing the bag body in hot water or water. It can be dissolved to adjust the flavor. In addition, spices such as cinnamon can be easily and quickly dispersed in coffee to give a characteristic flavor.

According to the extraction bag described in claim 4, since the thin film sheet of the multiple filter and the coarse fiber sheet are integrated by partial adhesion, the multiple filter is compared with a case where both sheets are simply overlapped. The strength is improved and the handling of the extraction bag is easy when making the bag. Moreover, the surface contact state which the above-mentioned coarse fiber sheet supports by supporting the thin film sheet in whole or in part can be more reliably created and maintained.

According to the extraction bag of claim 5, when the beverage or the like is not extracted, the coarse sheet of the multiple filter supports the thin film sheet in full or partial surface contact from the outside. It is difficult to spread and leakage of edible powder can be suppressed. On the other hand, when extracting beverages and the like, the thin film sheet is not easily supported by the coarse fiber sheet as described above, so the cut of the thin film sheet is easily expanded, and the edible powder is dispersed or dissolved in the beverage and leaked. Can be made.
Further, the extraction bag is in a state in which the coarse fiber sheet on the outer surface side covers the thin film sheet on the inner surface side, so that the incision of the thin film sheet can be hardly seen from the outside, and the product has a good appearance. be able to.

It is explanatory drawing showing the state at the time of non-extraction in one Embodiment of the multiple filter used for the extraction bag of this invention. It is explanatory drawing which shows embodiment whose bag main body of the bag for extraction of this invention is tetra shape. It is explanatory drawing showing the state at the time of extraction of the multiple filter shown in FIG. It is explanatory drawing showing the state at the time of the non-extraction in other embodiment of the multiple filter used for the bag for extraction of this invention. FIG. 5 is an explanatory diagram of a cross section taken along line AA of the multiple filter shown in FIG. 4. It is explanatory drawing showing the state at the time of extraction of the multiple filter shown in FIG. It is explanatory drawing which shows the example of the various cuts in the thin film sheet | seat of the multiple filter used for the extraction bag of this invention. It is explanatory drawing which shows embodiment whose bag main body of the bag for extraction of this invention is a rectangular flat bag shape. It is explanatory drawing which shows embodiment which the bag for extraction of this invention is a cafe pod (cartridge type bag) shape. It is explanatory drawing which shows the method of the extraction test by the bag for extraction of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The present invention is not limited to these embodiments.

First, an embodiment of the multiple filter 1 used in the extraction bag of the present invention will be described with reference to FIG.
The multiple filter 1 is an extraction filter suitable for extraction of beverages and the like, and is formed into a long band shape by superposing the thin film sheet 2 and the coarse fiber sheet 3. In FIG. 1, in order to easily understand the configuration of the multiple filter 1, the thin film sheet 2 and the coarse fiber sheet 3 are depicted as a rectangular shape and further shifted in an obliquely leftward direction.

The thin film sheet 2 is a thin sheet made of a material that is difficult to pass or does not pass edible powder, and is constituted by a fine fiber sheet or a film-like sheet.
Further, the thin film sheet 2 is formed with a cut 4 penetrating the front and back. The cuts 4 of the present embodiment shown in FIG. 1 are X-shaped with a size that can fit into a grid with a side of 10 mm, and a large number of them are regularly arranged at almost equal intervals.

The fine fiber sheet constituting the thin film sheet 2 is a sheet made of a fiber material such as a woven fabric, a non-woven fabric, or a paper in which synthetic fibers or natural fibers are interwoven or entangled to form a thin sheet as a whole. The maximum pore diameter of the fiber gap is preferably 200 μm or less. This is because such a relatively small fiber gap can effectively suppress the passage of the edible powder.

For example, when the fine fiber sheet is a non-woven fabric, the fineness is preferably 4.0 denier or less, and the basis weight is 3 to 50 g / m ² from the viewpoint of suppressing the passage of edible powder and reducing the cost. It is preferable that
Examples of the material of the nonwoven fabric include polyolefin fibers such as polyethylene, polypropylene and copolymer polypropylene, polyester fibers such as polyethylene terephthalate, copolymer polyester and aliphatic polyester, polylactic acid, polybutylene succinate, polyethylene succinate and aliphatic. Short fibers or long fibers such as polyester or aromatic polyester biodegradable fibers can be used, and the sheath is made of polyethylene, polypropylene, copolymer polyester, aliphatic polyester, etc., and the core is made of polypropylene, polyethylene terephthalate, or the like. A composite fiber having a core-sheath structure can be used.
Moreover, it does not specifically limit as a manufacturing method of this nonwoven fabric, A well-known spun bond method, a melt blow method, a needle punch method, a spun lace method, an airlaid method, a carding method, etc. are applicable.

In the case where the fine fiber sheet is a woven fabric, as a material of the woven yarn, a general long fiber for woven fabric can be used, but the heat at the time of making the multiple filter 1 in the extraction bag 5 is increased. From the viewpoint of sealing and fusing seal properties, polyester fibers such as polyethylene terephthalate, copolymer polyester, aliphatic polyester, polyolefin fibers such as polyethylene, polypropylene, copolymer polypropylene, polylactic acid, aliphatic polyester, or aromatic polyester These biodegradable fibers can be preferably used.
Further, monofilaments, multifilaments, core-sheath composite fibers combining two kinds of resins, spun yarns, and the like can be used as the form of the woven yarn.

Next, the film-like sheet constituting the thin film sheet 2 is a synthetic resin film formed by thinly spreading a heat-smelted synthetic resin or a synthetic fiber sheet such as a nonwoven fabric by hot pressing to form a fiber gap. Is a sheet made of a synthetic resin film or the like that is substantially occluded and generally has no through-holes, so that neither liquid nor edible powder can pass therethrough.
As a material for such a film-like sheet, a material excellent in hot water resistance is preferable. For example, polyolefin resins such as polyethylene, polypropylene and copolymer polypropylene, polyester resins such as polyethylene terephthalate, copolymer polyester and aliphatic polyester, polyamide Resin, polystyrene resin, polylactic acid, polybutylene succinate, polyethylene succinate, aliphatic polyester-based or aromatic polyester-based biodegradable resin can be used.

The thin film sheet 2 of the multiple filter 1 shown in FIG. 1 is a fine fiber sheet made of melt blown nonwoven fabric, the material is polyethylene terephthalate, the fineness is 0.6 denier, the basis weight is 5 g / m ² , and the maximum pore diameter of the fiber gap. Is 120 μm.

In addition, the maximum pore diameter of the fiber gap in the present invention is a value measured by the bubble point method (JIS K 3832). Specifically, the sample is immersed in 2-propanol so that 2-propanol is contained in all the pores of the sample by capillary action, and then air pressure is gradually applied from the lower surface side of the sample. The gas pressure is measured when the pressure exceeds the liquid surface tension in the pores and bubbles are generated. Since the bubble is generated first from the maximum aperture diameter portion, the maximum aperture diameter can be calculated by measuring the gas pressure at that time.

Next, the coarse fiber sheet 3 of the multiple filter 1 is a sheet made of a fiber material such as a woven fabric, a non-woven fabric, or a paper in which synthetic fibers or natural fibers are interwoven or entangled to form a thin sheet as a whole. Since the fiber gap is relatively large, it has liquid permeability and can pass edible powder.
The maximum opening diameter of the fiber gap of the coarse fiber sheet depends on the size of the edible powder to be passed, but is larger than the maximum opening diameter (200 μm or less) of the fiber gap of the fine fiber sheet and 150 to 1000 μm. Preferably there is.

In addition, the coarse fiber sheet 3 has a breaking strength necessary for making an extraction bag, and from the viewpoint of reducing the cost, when the coarse fiber sheet 3 is a woven cloth wrinkle, a fineness of 15 to The denier is preferably 40 denier and the basis weight is 10 to 40 g / m ^{2. When} the coarse fiber sheet 3 is a nonwoven fabric, the fineness is preferably 1.2 to 8 denier and the basis weight is 10 to 40 g / m ² .
As the material of the bag or nonwoven fabric, the fine fiber sheet constituting the thin film sheet 2 and substantially the same synthetic fiber can be used, but in order to obtain a high heat seal strength when making an extraction bag. In addition, it is preferable to employ a material having good welding compatibility with the thin film sheet 2.
Moreover, if materials having different melting points are employed as the material of the thin film sheet 2 and the coarse fiber sheet 3, only the sheet having a low melting point is melted and functioned as an adhesive during the heat sealing process. Can be carried out easily and reliably.

The coarse fiber sheet 3 of the multiple filter shown in FIG. 1 is a cocoon, the material of the weaving yarn is polyethylene terephthalate / low melting point polyester, the fineness is 25 denier, the basis weight is 21 g / m ² , and the maximum pore size of the fiber gap is 220 μm.

The multiple filter 1 shown in FIG. 1 is a mode in which the thin film sheet 2 and the coarse fiber sheet 3 are simply overlapped and are not adhered to each other. Therefore, the coarse fiber sheet 3 to which the cut is not attached is in a state of being in surface contact with and supported by the thin film sheet 2 to which the cut 4 is attached (surface contact state).
In such a surface contact state, various physical actions applied to the thin film sheet 2 from the outside are alleviated by the coarse fiber sheet 3, so that the notches 4 attached to the thin film sheet are substantially closed. The state is maintained. For example, the wall surface (multiple filter 1) of the extraction bag 5 may be deformed due to an external pressing force or the like when the extraction bag 5 made using the multiple filter 1 is packaged or transported. Even in this case, since the coarse fiber sheet 3 is in surface contact with the thin film sheet 2 and supported, the degree of deformation of the thin film sheet 2 is relaxed, and the notch 4 is difficult to expand and is maintained in a substantially closed state. Therefore, leakage of edible powder enclosed in the extraction bag 5 can be suppressed.

Next, an embodiment of the extraction bag 5 of the present invention manufactured using the multiple filter 1 will be described with reference to FIG.
The extraction bag 5 is picked up with a fingertip when the bag body 6 made into a tetra shape (tetrahedron shape) having a height of 50 mm using the multiple filter 1 shown in FIG. 1 and the extraction bag 5 are used. It consists of a tag 8 for picking up, and a hanging thread 7 having one end bonded to one apex portion of the bag body 6 and the other end bonded to the tag 8.
The bag body 6 is formed by arranging the thin film sheet 2 of the multiple filter 1 on the inner surface side and the coarse fiber sheet 3 on the outer surface side, and the bag body 6 has a size of about several mm as an extractable substance. The tea leaves for green tea (1.8 g) crushed and the fine powder (0.2 g) of tea leaves ground to a particle size of about 150 μm are encapsulated as edible powder.

Note that the form of the extraction bag 5 is not limited to that shown in FIG. 2. For example, the shape of the bag body 6 may be a pyramid shape or a rectangular flat bag shape (see FIG. 8). Further, the form of the extraction bag 5 may be a circular flat bag-shaped cafe pod (see FIG. 9) used in a coffee high-pressure extraction device that extracts coffee with high-pressure hot water.

Further, the extract to be enclosed in the bag body 6 is not limited to the above-mentioned tea leaves for green tea. For example, tea leaves such as black tea, roasted tea, oolong tea, and chuchu tea, roasted barley for barley tea, roasted coffee beans, bonito , Shavings such as bonito, dashi kelp, boiled and dried Chinese medicine can be used.
Furthermore, the edible powder enclosed in the bag body 6 is not limited to the above-mentioned tea leaf fine powder, but also seasonings such as sugar, low calorie sweetener, creaming powder, low calorie creaming powder, cocoa, caramel, salt, umami seasoning, etc. Fine powders or granules of the ingredients, or fine powders of spices such as cinnamon, vanilla beans, pepper, chili and various herbs can be employed.

Moreover, as a combination of the extract and edible powder enclosed in the bag body 6, in addition to the green tea tea leaves and tea leaf fine powder of this embodiment, tea tea leaves or roasted coffee beans and sugar fine powder or Combination of creaming powder fine powder, combination of roasted coffee beans and cocoa fine powder or cinnamon fine powder, combination of roasted barley and caramel granules for barley tea, combination of bonito and salt fine powder or umami seasoning fine powder for soup Etc.

The bag body 6 can be made by, for example, using a multiple filter 1 in which a continuous long thin film sheet 2 and a coarse fiber sheet 3 are spread and overlapped without any folds, and cut into a predetermined shape. And after forming and filling with tea leaves and tea leaf fine powder, a linear seal part (welding part) S may be formed by applying ultrasonic waves to the opening (not shown). Alternatively, the continuous long thin film sheet 2 and the coarse fiber sheet 3 can be set in a bag making and filling device at the same time, and the sheets can be made while being overlapped so that no creases are attached to both sheets.

In addition, as a method of sealing the opening portion when the bag body 6 is manufactured, in addition to the above-described ultrasonic sealing method, for example, the opening portion is clamped with a heat seal bar to form a planar seal portion and weld it. A method, a method in which an adhesive or adhesive tape is applied or pasted to an opening portion to form a planar seal portion and bonded, and a laser beam or the like is irradiated to the opening portion to form a linear seal portion and welded It is possible to adopt a method to do so.

When forming the linear seal portion S of the bag body 6, care must be taken not to form creases on the edge Sa of the linear seal portion S. When the crease is formed on the edge Sa of the linear seal portion S, the crease is fixed by the linear seal portion S. Therefore, the thin film sheet 2 of the multiple filter 1 and the coarse texture are formed around the crease. This is because the fiber sheet 3 is permanently separated and the surface contact state between the thin film sheet 2 and the coarse fiber sheet 3 may be impaired.

Next, the function of the extraction bag 5 will be described with reference to FIGS.
As shown in FIG. 2, the bag body 6 of the extraction bag 5 has a coarse fiber sheet 3 disposed on the outer surface side and a thin film sheet 2 disposed on the inner surface side. The coarse fiber sheet 3 that is not present is in a state of supporting the thin film sheet 2 with the cuts 4 in surface contact with the whole or part so as to cover from the outside.

Therefore, when the extraction bag 5 is not used, that is, when green tea is not extracted, for example, some external force is applied to the bag body 6 during transportation, and the thin film sheet 2 on the inner surface side is enclosed in tea leaves, etc. Even when the thin fiber sheet 3 is supported by the coarse fiber sheet 3 from the outer surface side, the degree of deformation of the thin film sheet 2 is relaxed, and the notch 4 is hardly expanded and is almost closed. Maintained. Therefore, leakage of tea leaf fine powder from the bag body 6 can be suppressed.
Further, in the extraction bag 5, since the coarse fiber sheet 3 on the outer surface side of the bag body 6 covers the thin film sheet 2 on the inner surface side, the cut 4 of the thin film sheet 2 is difficult to see from the outside. It's beautiful.

To extract green tea using the extraction bag 5, for example, hold the tag 8 with a fingertip, immerse the bag body 6 in a cup containing hot water for several seconds to several minutes, and drink components from the tea leaves in the bag body 6 After the extraction, the tag 8 is lifted and the bag body 6 is lifted from the cup.
As described above, when the bag body 6 is immersed in hot water, the hot water flows into the bag body 6 and is absorbed by the tea leaves. At that time, since the hot water has a large specific gravity and causes resistance, the hot water is cut into the thin film sheet 2. By passing 4 while expanding 4, an expanded portion 9 as shown in FIG. 3 is formed. Therefore, the tea leaf fine powder is dispersed in the hot water that has flowed into the bag body 6, and leaks together when the hot water convects and flows out of the bag body 6 through the expanding portion 9. become.
Further, if the fingertip having the tag 8 is moved up and down to shake the bag body 6 in the hot water to cause turbulent flow in the hot water inside and outside the bag main body 6, more tea leaf fine powder can be leaked. At that time, tea leaves larger than the tea leaf fine powder hardly pass through the coarse fiber sheet 3, and therefore hardly leak out from the bag body 6 regardless of whether the cut 4 of the thin film sheet 2 is opened or closed.

In addition, instead of tea leaves or the like in the bag body 6 of the extraction bag 5, for example, when roasted barley for barley tea and caramel granules as edible powder are encapsulated as an extract, or as a soup as an extract For example, when soy sauce is encapsulated as konbu and edible powder, the bag body 6 can be soaked in boiling hot water and extracted to boil barley tea or soup stock.

Next, another embodiment of the multiple filter used in the extraction bag of the present invention will be described with reference to FIGS.
As in the embodiment shown in FIG. 1, the multiple filter 1 shown in FIG. 4 includes a thin film sheet 2 and a coarse fiber sheet 3 that are overlapped to form a long band.
The thin film sheet 2 is the same melt blown nonwoven fabric as that of the embodiment of FIG. 1, but the cuts 4 formed through the front and back are straight lines having a length of about 12 mm formed along the longitudinal direction of the multiple filter 1. It has a shape, and a large number are regularly arranged at almost equal intervals.
Moreover, the coarse fiber sheet 3 is also the same ridge as the embodiment of FIG. 1, and the thin film sheet 2 and the coarse fiber sheet 3 are partially bonded by the bonding portions 10 formed by hot embossing, which are a large number of spot welded portions. Has been. Such adhesive portions 10 are alternately arranged with the cuts 4 as shown in FIG. 4 and FIG. 5 which is a cross-sectional view taken along the line AA.

In the multiple filter 1 of this embodiment, since the thin film sheet 2 and the coarse fiber sheet 3 are partially bonded and integrated, the strength is high, and the mechanical suitability in the bag making process of the extraction bag 5 is excellent. It is easy to handle.
Further, since the cuts 4 of the thin film sheet 2 are formed in a straight line shape along the longitudinal direction of the multiple filter 1, for example, in the bag making process of the extraction bag 5, the multiple filter 1 is conveyed in the longitudinal direction. In doing so, it is difficult to cause inconvenience that the notch 4 expands due to friction or catching with the conveyance path or due to a tensile force applied in the longitudinal direction of the multiple filter 1.

When extracting beverages or the like using the extraction bag made by the multiple filter 1 shown in FIG. 4, the bag body 6 is immersed in hot water as in the embodiment of FIG. Since the hot water passes through the notch 4 of the thin film sheet 2 while being expanded, an expanded portion 9 as shown in FIG. 6 is formed. Therefore, the edible powder is dispersed or dissolved in the hot water flowing into the bag main body 6 and leaks together when the hot water convects and passes through the expanding portion 9 and flows out of the bag main body 6.
In addition, since each adhesion part 10 which adheres the thin film sheet 2 and the coarse fiber sheet 3 partially is arrange | positioned sufficiently away from each notch 4, the expansion part 9 by the expansion operation of the notch 4 is provided. It does not inhibit formation. In addition, the position, size, shape, and the like of the bonding portion 10 can be changed as appropriate within a range that does not hinder the expanding operation of the cuts 4.

Next, the example of the form of the notch 4 attached to the thin film sheet 2 of the multiple filter 1 will be described.
As described above, the simplest form of the notch 4 may be the X shape shown in FIG. 1 or the straight line shape shown in FIG. 4, but is not limited thereto. For example, in order to adjust the amount of edible powder that is dispersed or dissolved during the extraction of a beverage or the like and leaks, or to enhance the design of the extraction bag, the form can be selected as appropriate.

Examples of such forms are shown in FIGS. 7 (a) to (e).
The notch 4 shown in (a) is a form in which three linear notches are combined in a radial shape.
The notch 4 shown in (b) is a form in which three linear notches are combined in an H shape.
The notch 4 shown in (c) is a waveform form represented by a curve.
The notch 4 shown in (d) is a waveform form represented by a straight line.
The notch 4 shown in (e) is a form in which long and short five linear notches are arranged in parallel.

Next, another embodiment of the extraction bag of the present invention will be described with reference to FIGS.
When the extraction bag 15 shown in FIG. 8 uses the bag main body 16 formed into a rectangular flat bag shape of 55 mm in length and 45 mm in width using the multiple filter 1 shown in FIG. A tag 18 for picking up with a fingertip, and a hanging thread 17 having one end bonded to the center of the upper side of the bag body 16 and the other end bonded to the tag 18.
The bag body 16 has two multiple filters 1 facing each other with the thin film sheet 2 on the inner surface side and the coarse fiber sheet 3 on the outer surface side, and a sheet-like seal portion S1 is formed on the periphery. It is sealed. The planar seal portion S1 is formed by sandwiching the multiple filter 1 with a heat seal bar, and the edge S1a of the planar seal portion S1 is in a state in which no folds other than very fine ridges are formed. That is, the crease is not substantially formed.

In the bag body 16, roasted coffee beans (7 g) pulverized to a size of several millimeters as an extract and sugar fine powder (particle size approximately 200 μm) prepared as an edible powder ( 3 g) and fine creaming powder (3 g) are enclosed.
The extraction bag 15 has a cut 14 of the thin film sheet 2 of the multiple filter 1 that is substantially closed when not extracted, such as during transportation, so that the fine powder of sugar and creaming powder is difficult to leak from the bag body 16. It is.

In order to extract coffee using the extraction bag 15, the bag body 16 may be immersed in hot water as in the case of the extraction bag 5 shown in FIG. 2 described above. Then, the hot water flows into the bag body 16 to expand the cut 14 of the thin film sheet 2, so that coffee is extracted from the roasted coffee beans and sugar and creaming powder are dissolved in the coffee. It becomes the state of “coffee with cream” and flows out of the bag body 6.
However, the particles of the roasted coffee beans are hardly leaked because the particles of the pulverized product of the roasted coffee beans are difficult to pass larger than the fiber gap (maximum aperture diameter 220 μm) of the coarse fiber sheet 3.

Next, the extraction bag 25 shown in FIG. 9 is a 60 mm diameter circular flat bag-shaped cafe pod (cartridge type bag) used for a coffee high pressure extraction device for extracting coffee with high pressure hot water.
The bag body 26 of the extraction bag 25 has two multiplex filters 1 facing each other, with the thin film sheet 2 facing the inner surface and the coarse fiber sheet 3 facing the outer surface, and a flange-shaped surface on the periphery. It is sealed by forming the seal portion S2. The planar seal portion S2 is formed by sandwiching the multiple filter 1 with a heat seal bar, and the edge S2a of the planar seal portion S2 is in a state where no folds other than very fine creases are formed. That is, the crease is not substantially formed.

In the bag body 26, roasted coffee beans (7 g) crushed to a size of several millimeters as an extractable substance and a creaming powder fine powder prepared to a particle size of about 200 μm as an edible powder (3 g) and cinnamon fine powder (2 g) pulverized to a particle size of about 150 μm are enclosed.
When the extraction bag 25 is unextracted during transportation or the like, the cut 24 of the thin film sheet 2 of the multiple filter 1 is almost closed, so that creaming powder and fine powder of cinnamon are difficult to leak from the bag body 26. It is.

In order to extract coffee using the extraction bag 25, the extraction bag 25 may be set at a predetermined location (not shown) of the coffee high-pressure extraction apparatus and the extraction apparatus may be operated. Then, high-pressure hot water flows from one side of the bag body 26 to expand the cuts 24 of the thin film sheet 2, and coffee is extracted from the roasted coffee beans, and the creaming powder dissolves to produce fine cinnamon powder. It is dispersed and becomes a “cafe cappuccino” (cinnamon-flavored cream coffee) and flows out of the bag body 26 from the other side of the bag body 26.
However, the particles of the roasted coffee beans are hardly leaked because the particles of the pulverized product of the roasted coffee beans are difficult to pass larger than the fiber gap (maximum aperture diameter 220 μm) of the coarse fiber sheet 3.

<Production of Example Sample>
Example samples A and B of two types of extraction bags 5 were produced using the multiple filter 1 shown in FIG.
Here, as described above, the multiple filter 1 is obtained by superposing the thin film sheet 2 and the coarse fiber sheet 3 without bonding. The thin film sheet 2 is a fine fiber sheet made of a melt blown nonwoven fabric. The material is polyethylene terephthalate, the fineness is 0.6 denier, the basis weight is 5 g / m ² , and the maximum opening diameter of the fiber gap is 120 μm. A large number of X-shaped cuts that are large enough to fit into a 10 mm side mesh that penetrates are regularly arranged. The coarse fiber sheet 3 is cocoon, the material of the weaving yarn is polyethylene terephthalate / low-melting polyester, the fineness is 25 denier, the basis weight is 21 g / m ² , and the maximum pore size of the fiber gap is 220 μm.

Samples A and B are both a tetra-shaped bag body 6 having a height of 50 mm, a hanging thread 7 having one end bonded to one apex portion of the bag body 6, and a tag 8 bonded to the other end of the hanging thread 7. In the bag body 6, both green tea leaves (1.8 g) having a size of about several mm as an extract and tea leaf fine powder (0.2 g) having a particle size of about 150 μm as edible powders are contained in the bag body 6. ) Is enclosed.
The difference between Samples A and B is the configuration of the wall surface of the bag body 6. The bag body 6 of the sample A has the thin film sheet 2 with the cuts 4 of the multiple filter 1 arranged on the inner surface side, and the cuts are attached. An unfinished coarse fiber sheet 3 is placed on the outer surface side to make a bag. On the other hand, the bag body 6 of sample B has an uncut rough fiber sheet 3 placed on the inner surface side, and the notch 4 is The attached thin film sheet 2 is disposed on the outer surface side to form a bag.

<Production of comparative sample>
In place of the multiple filter 1 in the embodiment sample A of the extraction bag described above, only the thin film sheet 2 provided with the X-shaped cuts 4 is used. C was made.
Further, in place of the thin film sheet 2 provided with the X-shaped cut 4 in the comparative sample C, the same thin film sheet is used except that no cut is provided, and the rest is the same as the sample C for extraction. A comparative sample D of bags was produced.
Further, in place of the extraction filter 1 in the example sample A, only the coarse fiber sheet 3 was used, and the other example of the extraction bag was prepared in the same manner as the sample A.

<Test example>
As a first test, a test for examining the leakage amount of tea leaf fine powder from the bag body 6 when not extracted using the above-mentioned two types of example samples A and B and three types of comparative samples C, D and E. went.
The test method is to suspend the suspension thread 7 of each sample fixed to the vibration part of a sieve tester (manufactured by IKA Labortechnik, model HS501), apply 125 Hz vibration in a fixed direction for 3 minutes, and leak from the bag body 6 The mass of the tea leaf fine powder dropped was measured. The test results are shown in Table 1.

Next, as a second test, the same two kinds of example samples as the first test and three kinds of comparative examples are used to examine the leakage amount of the tea leaf fine powder from the bag body 6 at the time of green tea extraction. Went.
First, as shown in FIG. 10, the bag body 6 of each sample is immersed in a water tank (beaker) 11 containing 200 ml of hot water 12 at a temperature of 90 ° C., and the bag body 6 is rotated clockwise three times. Subsequently, the bag main body 6 was taken out from the hot water 12 after rotating counterclockwise three times and further shaking up and down 10 times. Next, the obtained green tea was observed with the naked eye. Further, the obtained green tea was filtered to separate and collect tea leaves and tea leaf fine powder contained in the green tea, and the mass was measured after drying. The test results are shown in Table 1.

As is clear from Table 1, in Example Sample A, no leakage of tea leaf fine powder was observed when not extracted, and green tea exhibiting moderate turbidity was obtained during extraction, with the best results among all samples. there were.
Further, in Example Sample B, a slight leakage of tea leaf powder was observed when not extracted, but green tea exhibiting moderate turbidity was obtained during extraction, and there was no practical problem.

On the other hand, in Comparative Sample C, a large amount of the mixture of tea leaves and tea leaves leaked both when unextracted and when extracted, which was an undesirable result.
Moreover, in the comparative sample D, tea leaf fine powder does not leak when unextracted and is good, but tea leaf fine powder leaks only slightly during extraction, and the obtained green tea is almost transparent and almost free of turbidity. This was an undesirable result.
Furthermore, in Comparative Example Sample E, the amount of leakage of tea leaf fine powder when not extracted was large, which was an undesirable result.

The extraction bag according to the present invention can be used as an extraction bag for extracting beverages and the like from various extracts.

DESCRIPTION OF SYMBOLS 1 Multiple filter 2 Thin film sheet 3 Coarse fiber sheet 4,14,24 Cut 5,15,25 Extraction bag 6,16,26 Bag main body 7,17 Hanging thread 8,18 Tag 9 Expansion part 10 Adhesion part S Linear Seal part S1, S2 Planar seal part Sa, S1a, S2a

Claims (5)

An extraction bag in which an extractable substance and edible powder are enclosed in a bag body including an extraction filter,
At least a part of the extraction filter is formed by a multiple filter formed by laminating a thin film sheet with cuts penetrating the front and back and a coarse fiber sheet without cuts,
The extraction bag according to claim 1, wherein the bag body is sealed by a planar or linear seal portion, and a crease is not substantially formed on an edge of the seal portion. 2. The extraction bag according to claim 1, wherein the edible powder sealed in the bag body is a fine powder of an extractable substance. 2. The extraction bag according to claim 1, wherein the edible powder sealed in the bag body is a fine powder or granule of seasoning or spice. The extraction filter according to any one of claims 1 to 3, wherein the multiple filter is formed by partially bonding a thin film sheet and a coarse fiber sheet. The extraction bag according to any one of claims 1 to 4, wherein the thin film sheet of the multiple filter is disposed on the inner surface side of the bag body, and the coarse fiber sheet is disposed on the outer surface side of the bag body.

Images