JP2021123382A - Beverage extraction bag - Google Patents

Abstract

To provide a beverage extraction bag in which a substance to be extracted is less likely to leak from an opening when a beverage is extracted, and the substance to be extracted can be sufficiently swollen to extract the delicious beverage.SOLUTION: A beverage extraction bag P is made of a polylactic acid-based resin, and is formed of a long-fiber non-woven fabric having a boiling water shrinkage rate of 3 to 10% in an MD direction, and includes a rectangular bag body 1, an outer lid piece 3 extending to one end edge of an opening 2 of the bag body 1 and bent outward, and a fusion part 5 for fusing both side edges of the outer lid piece 3 of the bag body 1, further has the MD direction of the long fiber non-woven fabric coincided with the direction orthogonal to both side edges of the bag body 1.SELECTED DRAWING: Figure 1

Description

The present invention is for beverage extraction, in which a beverage can be extracted by storing an extract such as tea leaves, regular coffee powder, herbs, dried sardines, dried bonito, etc., and then sealing the opening and immersing the beverage in hot water. It's about bags.

An extract such as tea leaves is stored in the bag from the opening, and the outer lid piece extended to the edge of the opening is folded back and covered with the opening to seal the opening and then put into hot water. Beverage extraction bags for extracting beverages by immersing them or boiling them in hot water have been conventionally known.

For example, in Patent Document 1 (Japanese Patent Publication No. 59-138568), a water-resistant thin piece such as a non-woven fabric is folded in half and a part of one side surface is folded back together with a cover piece (outer lid piece) on both left and right edges. A pack (beverage extraction bag) having a structure in which a seal is provided, an opening is provided on one side, and a cover piece is inverted on the opposite side to cover the opening is disclosed.

In the pack of Patent Document 1, the cover piece is simply inverted and covered with the opening, and the opening is not completely sealed. Therefore, the object to be extracted is placed in the opening during the extraction of the beverage. There was a problem that it easily leaked out of the bag. In particular, if the pack is boiled in boiling water or if hot water is poured vigorously from the top of the pack, the cover piece may turn up and a large amount of extract may leak out. rice field.

Therefore, various techniques for preventing leakage of the object to be extracted from the beverage extraction bag have been proposed.
For example, in Patent Document 2 (Practical New Design Registration No. 25389933), a tea bag (beverage extraction bag) made of a non-woven fabric or the like is embossed on both front and rear edges of the opening. Therefore, there is disclosed a technique in which the non-woven fabric or the like is moistened with hot water during extraction, so that the embossed portions are overlapped and integrated, and the closing condition of the opening is improved. However, such a technique has a problem that the manufacturing cost increases because it is necessary to emboss a specific part of the tea bag.

Further, in Patent Document 3 (Japanese Patent Publication No. 1-178038), a decoction bag (beverage extraction bag) made of a water-permeable sheet, in which an inner lid piece double-folded is provided in the opening on the back side surface. Disclosed is a technique for sealing the opening during use of the decoction bag. However, this decoction bag has a problem that when the extract is put into the bag through the opening, the double-folded inner lid piece becomes an obstacle and it is difficult to put the extract into the bag. There is also a problem that the manufacturing cost increases due to the formation of the lid piece.

Further, in recent years, there is a problem that a biodegradable material is desired from the viewpoint of reducing the environmental load when disposing of the extraction bag after use.

Jikkai Sho 59-138568 Gazette Utility Model Registration No. 25389933 Jikkenhei 1-178038 Gazette

Therefore, according to the present invention, the extract to be extracted does not easily leak from the opening when the beverage is extracted, and the extract can be sufficiently swelled to extract a delicious beverage, which can be produced at low cost and further biodegraded. An object of the present invention is to provide a beverage extraction bag made of a sex material.

The above problem was solved by the following means.

[1] It is made of a polylactic acid-based resin, is formed of a long-fiber non-woven fabric having a boiling water shrinkage rate of 3 to 10% in the MD direction, and extends over a rectangular bag and one end edge of an opening of the bag. It is provided with an outer lid piece that is bent outward and a fusion portion that fuses both side edges of the bag body and both side edges of the outer lid piece, and is provided in the MD direction of the long fiber non-woven fabric and both sides of the bag body. A beverage extraction bag characterized in that the direction orthogonal to the edge is matched.

[2] The beverage extraction bag according to the above [1], wherein the boiling water shrinkage rate of the long fiber non-woven fabric in the CD direction is 2% or less.

[3] The long-fiber non-woven fabric is a laminated non-woven fabric having a spunbond non-woven fabric layer and a melt-blow non-woven fabric layer, and the melt-blow non-woven fabric layer is arranged inside the bag body. The beverage extraction bag according to [2].

In the beverage extraction bag according to the above [1], first, an extract such as tea leaves is put into the bag through the opening, and then the outer lid piece is placed on the side of the bag body on which the outer lid piece is not formed. The beverage extract bag containing the extract is immersed in hot water to extract the beverage from the extract and use it. Is.

The beverage extraction bag according to [1] above is made of a polylactic acid-based resin in which the long-fiber non-woven fabric forming the bag is generally easily heat-shrinkable and has a high boiling water shrinkage rate, and has a boiling water shrinkage rate of 3 to 10% in the MD direction. Yes, and the MD direction is aligned with the direction orthogonal to both side edges of the bag body of the beverage extraction bag.
Therefore, when the object to be extracted is stored in the bag of the beverage extraction bag and immersed in hot water at a high temperature of about 90 to 100 ° C., the long-fiber non-woven fabric is oriented in the direction orthogonal to both side edges of the bag due to the heat of the hot water. By contracting a little, the outer lid piece that covers the opening of the bag is deformed into a form that binds the opening and tightly seals it, so that the extract inside the bag does not easily leak out of the bag. It has the effect of becoming.

Further, since the long-fiber non-woven fabric forming the beverage extraction bag has a boiling water shrinkage rate of 10% or less in the MD direction, it does not shrink and deform excessively when the beverage extraction bag is immersed in hot water. The inconvenience that the volume inside the bag becomes too small and the swelling of the extract to be extracted by hot water is hindered is unlikely to occur.

Further, since the beverage extraction bag of the present invention is made of a polylactic acid-based resin which is a biodegradable resin, when the extract to be extracted after use is buried in the soil while being stored, the extract is to be extracted. Degraded by microorganisms along with. Therefore, it is not necessary to incinerate using fuel such as gas or petroleum at the time of disposal, and the environmental load can be reduced.

The beverage extraction bag according to the above [2] has a boiling water shrinkage rate of 2% or less in the CD direction of the long-fiber non-woven fabric forming the beverage extraction bag, and therefore, when the beverage extraction bag is immersed in hot water. In addition, it hardly shrinks in the direction parallel to both side edges of the bag body.
Therefore, since excessive shrinkage deformation of the beverage extraction bag can be suppressed, the volume inside the bag can be maintained to be sufficient for the object to be extracted stored in the bag to be swollen by hot water. .. Further, it has the effect of suppressing excessive shrinkage and deformation of the beverage extraction bag and improving the appearance of the beverage when it is extracted.

The beverage extraction bag according to [3] above is a laminated non-woven fabric in which the long-fiber non-woven fabric forming the bag has a spunbond non-woven fabric layer and a melt-blow non-woven fabric layer, and the melt-blow non-woven fabric layer is arranged inside the bag body. doing.
In general, melt-blown non-woven fabrics are more easily heat-shrinkable than spun-bonded non-woven fabrics and have a high boiling water shrinkage rate. Therefore, when the beverage extraction bag with the melt blow non-woven fabric layer arranged inside is immersed in hot water for its use, the hot water first touches the outer spunbonded non-woven fabric layer to remove heat and the temperature rises. It is considered that excessive shrinkage of the melt-blown non-woven fabric layer is suppressed because the hot water whose temperature drops rapidly and then comes into contact with the melt-blow non-woven fabric layer which is easily heat-shrinked, and as a result, the beverage extraction bag The degree of contraction deformation as a whole is alleviated.

Therefore, the beverage extraction bag has an effect that the volume inside the bag can hold a sufficient volume for the object to be extracted stored in the bag to swell with hot water. Further, by arranging the spunbonded non-woven fabric which is hard to shrink and deform on the outside of the beverage extraction bag, the degree of shrinkage deformation of the beverage extraction bag as a whole is visually felt to be small, and the beverage is extracted at the time of beverage extraction. It has the effect of making the appearance of the bag more beautiful.

It is a front view which shows one Embodiment of the beverage extraction bag of this invention. FIG. 3 is a cross-sectional view taken along the line AA of the beverage extraction bag of FIG. It is a rear view which shows the state which stored the object to be extracted in the beverage extraction bag of FIG. 1, and sealed the opening. FIG. 3 is a cross-sectional view taken along the line BB of the beverage extraction bag of FIG. It is a partially enlarged explanatory view which shows the state before being immersed in hot water of the beverage extraction bag of FIG. It is a partially enlarged explanatory view which shows the state after being immersed in hot water of the beverage extraction bag of FIG.

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

1 and 2 show an embodiment of a beverage extraction bag, FIG. 1 is a front view, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.
The beverage extraction bag P is formed of a laminated non-woven fabric having a spunbonded non-woven fabric layer and a melt-blow non-woven fabric layer, which are long-fiber non-woven fabrics made of a polylactic acid-based resin, and is provided on the bag body 1 and the upper part of the bag body 1. An outer lid piece 3 extending to the front edge of the opening 2 (right side in FIG. 2) and bent outward of the bag 1 and extending to the rear edge of the opening 2 (left side in FIG. 2). An inner bent piece 4 that is set and bent inside the bag body 1 is provided, and the left and right side edges of the bag body 1, the outer lid piece 3, and the inner bent piece 4 are each formed by heat fusion. It is integrally joined in 5.

In the present embodiment, a laminated non-woven fabric having two layers of long-fiber non-woven fabric is used as the long-fiber non-woven fabric forming the beverage extraction bag P, but the present invention is not limited to this, and a single-layer long-fiber non-woven fabric or three. A laminated non-woven fabric having a long fiber non-woven fabric layer of one or more layers can also be adopted.
Further, the beverage extraction bag P of the present embodiment is provided with an inner bent piece 4 for the purpose of reinforcing the edge of the opening 2, but for the purpose of the present invention of preventing leakage of the object to be extracted 6. Since it is an unnecessary part, it is not necessary to provide the inner bent piece 4.
Further, in the present embodiment, the bottom portion of the bag body 1 is a crease portion in which the non-woven fabric is folded downward in a valley fold, but a gusset can be provided by forming two valley folds and a mountain fold in the central portion thereof. ..
Further, in order to simplify the handling of the beverage extraction bag P at the time of disposal after use, a string (not shown) may be attached to the bag body 1 at any position.

In general, long-fiber non-woven fabrics such as spunbonded non-woven fabrics and melt-blown non-woven fabrics extrude a resin melted at a high temperature from a spinning nozzle, blow high-speed air onto the non-woven fabric, pull it, stretch it, and accumulate it on a collector such as a conveyor. To form a long web, and then press it as necessary to shape it into a long sheet and manufacture it. Therefore, the long fiber non-woven fabric is a long object extending in the direction in which the fibers constituting the long fiber non-woven fabric are formed, the longitudinal direction thereof is referred to as "MD direction", and the width direction orthogonal to the longitudinal direction is referred to as "CD direction". Is called.
Most of the fibers constituting the long-fiber non-woven fabric extend in the MD direction and are in a state of being substantially parallel in the CD direction. Therefore, when the long-fiber non-woven fabric is in contact with hot water and shrinks, it is generally in the MD direction. It shows a high shrinkage rate and a low shrinkage rate in the CD direction.

In the beverage extraction bag P of the present embodiment, the MD direction of the laminated non-woven fabric forming the bag P and the direction orthogonal to both side edges of the bag 1 (hereinafter, also referred to as "left-right direction") are matched. The boiling water shrinkage rate in the MD direction is 3 to 10%.

Further, the laminated non-woven fabric forming the beverage extraction bag P preferably has a boiling water shrinkage rate of 2% or less in the CD direction. Then, when the beverage extraction bag P is immersed in hot water, it hardly shrinks in the direction parallel to both side edges of the bag body 1 (hereinafter, also referred to as "vertical direction").

Crystals of polylactic acid-based resin constituting the spunbonded non-woven fabric layer and the melt-blown non-woven fabric layer in order to reduce the boiling water shrinkage rate in the MD direction of the laminated non-woven fabric to 3 to 10% and the boiling water shrinkage rate in the CD direction to 2% or less. The degree of crystallization may be adjusted as appropriate.
Here, the crystallinity is the ratio of the crystallinized portion to the entire resin when the polylactic acid-based resin is partially crystallized. Generally, when the crystallinity of the resin is low, the softening point of the resin is low. It is known that shrinkage due to heat is likely to occur.

To adjust the degree of crystallization of the polylactic acid-based resin, for example, when adjusting the L-form content ratio of the polylactic acid-based resin or when preparing these non-woven fabric layers, the polylactic acid-based resin in the fiber spinning step is used. The melting temperature may be adjusted, or the speed and temperature of the air flow applied to the fibrous molten resin may be adjusted.

As another method for adjusting the boiling water shrinkage rate of the laminated non-woven fabric, there is a method of appropriately changing the mass ratio of each basis weight of the spunbonded non-woven fabric layer having a low boiling water shrinkage rate and the melt blow non-woven fabric layer having a high boiling water shrinkage rate. be.

3 and 4 show a state when the beverage extraction bag P is used, FIG. 3 is a rear view, and FIG. 4 is a cross-sectional view taken along the line BB. Further, FIGS. 5 and 6 show a state when the beverage extraction bag P is used, FIG. 5 shows a state before the beverage extraction bag P is immersed in hot water, and FIG. 6 shows a state before being immersed in hot water. It is the state after immersion.

When using the beverage extraction bag P, first, the extract 6 such as tea leaves, regular coffee powder, herbs, dried sardines, and sack is stored in the bag 1 through the opening 2, and then the bag 1 is used. The outer lid piece 3 on the front side of the bag is folded back so as to be inverted toward the back side of the bag body 1, and is covered with the opening 2 to be sealed. 3, FIG. 4 and FIG. 5 show the state after such sealing.

Next, when the beverage extraction bag P containing the object to be extracted 6 is immersed in hot water, the laminated non-woven fabric forming the beverage extraction bag P rapidly shrinks in the MD direction by 3 to 10%. Therefore, the outer lid piece 3 covering the opening 2 of the bag body 1 is contracted and deformed in the left-right direction, and is deformed into a form that strongly seals the opening 2 as shown in FIG.
Therefore, the beverage extraction bag P containing the extract 6 can be boiled in boiling hot water, or put in a teapot or the like and the hot water is poured vigorously from above, but the outer lid piece 3 is used. It is difficult to turn up and it is possible to prevent the extract 6 from leaking out.

As the polylactic acid-based resin constituting the spunbonded non-woven layer and the melt-blow non-woven layer of the laminated non-woven fabric of the beverage extraction bag P, a polymer of L-lactic acid or D-lactic acid, and a copolymer of L-lactic acid and D-lactic acid are used. It can be used, and further, a copolymer of L-lactic acid, D-lactic acid and hydroxycarboxylic acid, or a mixture of these polymers in an arbitrary ratio can be used.

As described above, the crystallinity of the polylactic acid-based resin constituting each long-fiber non-woven fabric layer is related to the L-form content ratio of the polylactic acid-based resin. The L-form content ratio is the ratio of the mass of L-lactic acid to the total mass of L-lactic acid and D-lactic acid constituting polylactic acid. Generally, when the L-form content ratio is high, the crystallinity is high. When the L-form content ratio is low, the crystallinity tends to be low.

If the crystallinity of the polylactic acid-based resin constituting the melt-blown nonwoven fabric layer of the laminated nonwoven fabric is set to 10% or less, the softening point of the polylactic acid-based resin is lowered, and the melt-blown nonwoven fabric layer is shrink-deformed at about 80 ° C. be able to. Therefore, even when the temperature of the hot water in which the beverage extraction bag P is immersed is a relatively low temperature of about 80 ° C., the outer lid piece 3 covering the opening 2 of the bag body 1 and the opening 2 are strongly strengthened. It can be contracted and deformed in the left-right direction so as to be sealed so that the object 6 in the bag 1 is less likely to leak out of the bag 1.

Other components can be added to the polylactic acid-based resin as long as the effects of the present invention are not impaired. For example, impact improving agents such as various elastomers, crystal nucleating agents, coloring inhibitors, matting agents, antioxidants, plasticizers, lubricants, heat stabilizers, flame retardants, antistatic agents, weathering agents, coloring agents or Pigments and the like can be added as appropriate. Further, as long as the effect of the present invention is not impaired, it is possible to mix fibers of a resin other than the polylactic acid-based resin as the material of the laminated non-woven fabric. The mixing ratio of the fibers of the other resin and the like is preferably about 10% or less with respect to the laminated non-woven fabric.

The laminated non-woven fabric constituting the beverage extraction bag P can be produced by laminating a spunbonded non-woven fabric and a melt-blown non-woven fabric produced by a known method by a known method. For example, the spunbonded non-woven fabric and the melt-blown non-woven fabric may be individually prepared and then superposed and joined by a partial thermocompression bonding treatment or the like. Alternatively, the melt-blown nonwoven fabric may be laminated while forming a melt-blown nonwoven fabric by spraying the heat-melted polylactic acid-based resin on the surface of the spunbonded nonwoven fabric in the form of fibers.

As a method for producing the spunbonded non-woven fabric layer, for example, the raw material polylactic acid-based resin is heated and melted, extruded from a spinning nozzle, and then blown with high-speed air to pull and stretch while cooling to form fibers. , Aggregate on a collector such as a conveyor to form a web, and then use a heated or unheated flat roll or embossed roll, etc., on the resulting web, as needed, to achieve the thickness of the web. Can be mentioned as a production method such as adjusting or partially heat-bonding.

When performing a partial thermocompression bonding treatment on the web, for example, the web is passed between a pair of rolls composed of a heated embossed roll having an uneven surface structure and a flat roll having a smooth surface, and the spunbonded non-woven fabric is used. It suffices to form a thermocompression bonding portion evenly distributed over the entire surface of the above. The area ratio of the thermocompression bonding portion (thermocompression bonding area ratio) is preferably 5.0 to 30% with respect to the total area of the surface of the non-woven fabric.

As a method for creating the melt-blown non-woven fabric layer, for example, the raw material polylactic acid-based resin is heated and melted, extruded from a spinning nozzle, and blown with high-temperature and high-speed air to pull and stretch it into a fibrous form. , A method of laminating while adhering to the surface of the spunbonded non-woven fabric can be mentioned.

Further, it is preferable that the step of creating the spunbonded nonwoven fabric layer and the step of creating the melt-blown nonwoven fabric layer are continuously performed in a so-called in-line manner because the production efficiency can be improved.
The laminated non-woven fabric constituting the beverage extraction bag P can be a laminated non-woven fabric consisting of three or more layers by further laminating other non-woven fabrics, woven fabrics, etc., as long as the effects of the present invention are not impaired. ..

Further, as the form of the fiber of each non-woven fabric constituting the spunbonded non-woven fabric layer and the melt-blown non-woven fabric layer, a monofilament, a multifilament, or a composite fiber having a core-sheath structure in which two kinds of resins are combined can be used. Further, the cross-sectional shape of these fibers does not necessarily have to be round, and may be irregular such as elliptical, triangular or other polygonal, or even hollow.

The beverage extraction bag P has the MD direction of the laminated non-woven fabric forming the bag P coincided with the direction orthogonal to both side edges (left-right direction) of the bag body 1, and the boiling water shrinkage rate in the MD direction is 3. It is 10%.
Therefore, when the object to be extracted 6 is stored in the bag body 1 of the bag P for beverage extraction and immersed in hot water at a high temperature of about 90 to 100 ° C., the laminated non-woven fabric is moved in the left-right direction of the bag body 1 by the heat of the hot water. By shrinking a little, the outer lid piece 3 covering the opening 2 of the bag 1 is deformed into a form that binds the opening 2 and tightly seals the opening 2, so that the extract 6 in the bag 1 is deformed. Has the effect of making it difficult for the bag to leak out of the bag body 1.

Further, since the laminated non-woven fabric forming the beverage extraction bag P has a boiling water shrinkage rate of 10% or less in the MD direction, the beverage extraction bag P is not excessively contracted and deformed when immersed in hot water. The inconvenience that the volume inside the bag 1 becomes too small and the swelling of the extract 6 due to hot water is hindered is unlikely to occur.

Further, since the beverage extraction bag P is made of a polylactic acid-based resin which is a biodegradable resin, when the extract 6 after use is buried in the soil in the stored state, the extract 6 is used. Degraded by microorganisms along with. Therefore, it is not necessary to incinerate using fuel such as gas or petroleum at the time of disposal, and the environmental load can be reduced.

Further, the beverage extraction bag P preferably has a boiling water shrinkage rate of 2% or less in the CD direction of the laminated non-woven fabric forming the bag P. Then, when the beverage extraction bag 1 is immersed in hot water, it hardly shrinks in the direction parallel to both side edges (vertical direction) of the bag body 1.
Therefore, since excessive shrinkage deformation of the beverage extraction bag P can be suppressed, the volume inside the bag 1 is sufficient for the extract 6 stored in the bag 1 to be swollen by hot water. It has the effect of being able to hold it. Further, it has the effect of suppressing excessive shrinkage deformation of the beverage extraction bag P and improving the appearance of the beverage when it is extracted.

Further, the beverage extraction bag P is a laminated non-woven fabric in which the long-fiber non-woven fabric forming the bag P has a spunbond non-woven fabric layer and a melt-blow non-woven fabric layer, and the melt-blow non-woven fabric layer is arranged on the inner layer 7, and the spunbond non-woven fabric is arranged. It is preferable to arrange the layer on the outer layer 8.
Then, when the beverage extraction bag P is immersed in hot water, the hot water first touches the spunbonded non-woven fabric layer of the outer layer 8 to take away heat and the temperature drops rapidly, and then the temperature drops. Since the reduced hot water comes into contact with the melt-blow non-woven fabric layer that easily shrinks due to heat of the inner layer 7, excessive shrinkage of the melt-blow non-woven fabric layer is suppressed, and the degree of shrinkage deformation of the beverage extraction bag P as a whole is alleviated. NS.

Therefore, the beverage extraction bag P has an effect that the volume inside the bag 1 can be maintained sufficiently for the object to be extracted 6 stored in the bag 1 to be swollen by hot water. Further, by arranging the spunbonded non-woven fabric which is hard to shrink and deform on the outside of the beverage extraction bag P, the degree of shrinkage deformation of the beverage extraction bag P as a whole is visually felt to be small, and the degree of shrinkage deformation as a whole is felt at the time of extracting the beverage. It has the effect of making the appearance of the beverage extraction bag P more beautiful.

The basis weight of the laminated non-woven fabric constituting the beverage extraction bag P is preferably ^{10 to 30 g / m 2.} Within the range where the basis weight is applied, it has sufficient strength, is excellent in the extractability of the beverage, and has high transparency. Therefore, the state of tea leaves, herbs, etc. stored in the beverage extraction bag P should be visually recognized. Because it can be done.

Hereinafter, the present invention will be specifically described with reference to Examples.
First, a method for measuring each index in the present invention will be described.

(1) Boiling water shrinkage rate (%)
Three 5 cm square test pieces were collected from the non-woven fabric to be tested. Each test piece was marked with a length of 3 cm at three locations in the MD direction (longitudinal direction) and the CD direction (width direction) during the production of the non-woven fabric. Next, each test piece was immersed in boiling water for 3 minutes and then air-dried. Then, the length of the mark indicating the length of these three test pieces was measured, and the average value of the boiling water shrinkage rate in the MD direction and the average value of the boiling water shrinkage rate in the CD direction were obtained.

(2) Metsuke (g / m ² )
According to JIS L-1906, a 10 cm square test piece was taken from the non-woven fabric to be tested and the mass was measured and calculated.

(3) Crystallinity (%)
A test piece is taken from the non-woven fabric to be tested, the test piece is set in a differential scanning calorimeter, the temperature is raised from 30 ° C. to 240 ° C. at a heating rate of 10 ° C./min, and the crystallization calorific value ΔHc and crystallization. The amount of heat of fusion ΔHm was measured and calculated by the following formula. In addition, Q in the formula is the heat of fusion of a perfect crystal (unit: J / g), and in the case of polylactic acid, Q = 93.
Crystallinity χc (%) = (ΔHm−ΔHc) / Q × 100

[Example]
(1) Preparation of laminated non-woven fabric Polylactic acid (L-form content ratio 98%) melted at 220 ° C. is extruded from a spinning nozzle to form fibers, and the fibrous resin is stretched at a spinning speed of 3000 m / min using an ejector. While cooling to form long fibers, the long fibers were accumulated on a belt conveyor moving at a constant speed to obtain a long first web layer (spun-bonded non-woven fabric layer).
Next, polylactic acid (L-form content ratio 98%) melted at 250 ° C. was extruded from a spinning nozzle to form a fibrous material, and an air stream heated to 295 ° C. was applied to the fibrous resin to disperse the fibrous resin at a constant speed. By spraying and accumulating and solidifying on the surface of the first web that moves in, a second web layer (melt blow non-woven fabric layer) is formed, and the first and second web layers are fixed, and then the first and second web layers are fixed. The thickness was adjusted to 0.075 mm through a flat roll to prepare a long laminated non-woven fabric.

The obtained laminated non-woven fabric was thin, durable and highly transparent, and the direction in which the boiling water shrinkage rate was the highest was in the MD direction, and the boiling water shrinkage rate value in the MD direction was 5.3%. The boiling water shrinkage rate in the CD direction was 1.2%.
The basis weight of the spunbonded non-woven fabric layer of the laminated non-woven fabric was 12 g / m ² , and the crystallinity of the polylactic acid constituting the same layer was 35%. Further, the basis weight of the melt-blown non-woven fabric layer was 6 / m ² , and the crystallinity of the polylactic acid constituting the same layer was 3%.

(2) Manufacture of a beverage extraction bag The laminated non-woven fabric prepared in (1) above is set in a bag making machine, cut into a predetermined shape, bent, and then heated to 150 ° C. with a heat seal bar. A fused portion 5 was formed by surface fusion with a narrow pressure to produce a beverage extraction bag P.
In the beverage extraction bag P, the MD direction of the laminated non-woven fabric forming the bag P coincides with the direction (left-right direction) orthogonal to both side edges of the bag body 1, and melt blown as the inner layer 7 of the laminated non-woven fabric. A non-woven fabric layer is arranged, and a spunbonded non-woven fabric layer is arranged as an outer layer 8. The beverage extraction bag P has a rectangular flat bag shape with a width of 95 mm on the left and right and a height of 70 mm on the top and bottom, the height of the outer lid piece 3 is 35 mm, and the height of the inner bent piece 4 is 25 mm. there were.

(3) Extraction of oolong tea with a beverage extraction bag From the opening 2 of the beverage extraction bag P manufactured in (2) above, 3 g of oolong tea leaves are stored in the bag body 1, and then on the front side of the bag body 1. A certain outer lid piece 3 was folded back so as to be inverted toward the back side of the bag body 1 and covered with the opening 2 to seal it.
Next, when the beverage extraction bag P containing the tea leaves was immersed in boiling hot water to boil the oolong tea and taken out from the hot water after 5 minutes, the tea leaves leaked from the beverage extraction bag P. There was no drink, and the tea leaves were sufficiently swollen, and delicious oolong tea could be extracted.

[Test example]
<Non-woven fabric for testing>
As the non-woven fabric used in the test, "nonwoven fabric A" to "nonwoven fabric F" were prepared. The types of resins, basis weights, boiling water shrinkage rates in the MD and CD directions of each layer constituting these non-woven fabrics are as shown in the following and Table 1.

Non-woven fabric A: A single-layer spunbonded non-woven fabric (grain 15 g / m ² ) made of polylactic acid (L-form content ratio 99%), having a boiling water shrinkage rate of 2.3% in the MD direction and a boiling water shrinkage rate in the CD direction. Is 0.3%.
Non-woven fabric B: A laminated non-woven fabric composed of a spunbonded non-woven fabric layer (grain 12 g / m ² ) made of polylactic acid (L-form content ratio 99%) and a melt-blown non-woven fabric layer (grain 6 g / m ^{2) in the MD direction.} The boiling water shrinkage rate is 3.4%, and the boiling water shrinkage rate in the CD direction is 0.6%.
Non-woven fabric C: The laminated non-woven fabric according to "(1) Preparation of laminated non-woven fabric" in the above embodiment.
Non-woven fabric D: A laminated non-woven fabric composed of a spunbonded non-woven fabric layer (grain 8 g / m ² ) made of polylactic acid (L-form content ratio 98%) and a melt-blown non-woven fabric layer (grain 8 g / m ^{2) in the MD direction.} The boiling water shrinkage rate is 9.7%, and the boiling water shrinkage rate in the CD direction is 2.3%.
Nonwoven fabric E: A single-layer melt-blown non-woven fabric (grain 15 g / m ² ) made of polylactic acid (L-form content ratio 98%), with a boiling water shrinkage rate of 50% in the MD direction and 49% in the CD direction. Is.
Non-woven fabric F: A laminated non-woven fabric composed of a spunbonded non-woven fabric layer (grain 12 g / m ² ) made of polyethylene terephthalate (PET) and a melt-blown non-woven fabric layer (grain 6 g / m ² ), which shrinks and deforms even when immersed in boiling water. do not.

<Shrinkage deformation test using a sample of beverage extraction bag>
(1) Preparation of Beverage Extraction Bag Samples The following "Sample 1" to "Sample 7" of the beverage extraction bag were prepared using the above "nonwoven fabric A" to "nonwoven fabric E".

Sample 1: This is a sample prepared by using the above-mentioned non-woven fabric A, which has the same shape and size as the beverage extraction bag P described in "(2) Manufacture of a beverage extraction bag" of the above-mentioned Example. The MD direction of the non-woven fabric A is aligned with the direction orthogonal to both side edges of the bag body 1.

Sample 2: This is a sample having the same shape and size as the beverage extraction bag P described in "(2) Manufacture of a beverage extraction bag" of the above example, and prepared by using the above-mentioned non-woven fabric B. The melt-blown non-woven fabric layer of the non-woven fabric B is arranged as the inner layer 7 of the bag body 1, and the MD direction of the non-woven fabric B is aligned with the direction orthogonal to both side edges of the bag body 1.

Sample 3: Beverage extraction bag P according to "(2) Manufacture of beverage extraction bag" in the above example.

Sample 4: This is a sample having the same shape and size as the beverage extraction bag P described in "(2) Manufacture of a beverage extraction bag" of the above example, and prepared by using the above-mentioned non-woven fabric D. The melt-blown non-woven fabric layer of the non-woven fabric D is arranged as the inner layer 7 of the bag body 1, and the MD direction of the non-woven fabric D is aligned with the direction orthogonal to both side edges of the bag body 1.

Sample 5: A sample prepared by using the above-mentioned non-woven fabric E, which has the same shape and size as the beverage extraction bag P described in "(2) Manufacture of a beverage extraction bag" of the above-mentioned Example. The MD direction of the non-woven fabric E is aligned with the direction orthogonal to both side edges of the bag body 1.

Sample 6: A sample having the same shape and size as the beverage extraction bag P described in "(2) Manufacture of a beverage extraction bag" of the above example, and prepared by using the above-mentioned non-woven fabric C. The spunbonded non-woven fabric layer of the non-woven fabric C is arranged as the inner layer 7 of the bag body 1, and the MD direction of the non-woven fabric D is aligned with the direction orthogonal to both side edges of the bag body 1.

Sample 7: A sample prepared by using the above-mentioned non-woven fabric C, which has the same shape and size as the beverage extraction bag P described in "(2) Manufacture of a beverage extraction bag" of the above-mentioned Example. The melt-blown non-woven fabric layer of the non-woven fabric C is arranged as the inner layer 7 of the bag body 1, and the MD direction of the non-woven fabric C is aligned with the direction parallel to both side edges of the bag body 1.

(2) Test method 3.0 g of tea leaves of oolong tea are stored in each of the bag bodies 1 of the beverage extraction bags P of samples 1 to 7, and after boiling, the heating is stopped and the mixture is immersed in hot water within 1 minute. After 10 seconds, the sample was taken out from hot water, and the state of shrinkage deformation of each sample was observed and evaluated.
The evaluation criteria are as follows a to c.

a: The beverage extraction bag P is slightly contracted and deformed, and the opening 2 is sealed by the outer lid piece 3.
b: The beverage extraction bag P is slightly contracted and deformed, there is a slight gap between the opening 2 and the outer lid piece 3, and the sealing is loose.
c: The beverage extraction bag P is largely contracted and deformed as a whole.
The test results are shown in Table 2 below.

From Table 2, the MD direction of the long-fiber non-woven fabric forming the beverage extraction bag P and the direction (left-right direction) orthogonal to both side edges of the bag 1 coincide with each other, and boiling water in the MD direction of the long-fiber non-woven fabric. When the shrinkage rate belongs to the range of 3 to 10% (samples 2, 3, 4, 6), the opening 2 of the bag body 1 is sealed by the outer lid piece 3, and the beverage extraction bag P It can be seen that the degree of contraction deformation of is small.

Further, when the boiling water shrinkage rate in the CD direction of the long fiber non-woven fabric forming the beverage extraction bag P is 2% or less (samples 2 and 3), and when the boiling water shrinkage rate in the CD direction exceeds 2% (sample). Comparing with 4), when the boiling water shrinkage rate in the CD direction is 2% or less (Samples 2 and 3), the volume of the bag 1 is maintained larger when immersed in hot water and is stored. It can be seen that the tea leaves of the oolong tea were in a state where they were sufficiently swelling.

Further, comparing the case where the melt-blow non-woven fabric layer is arranged as the inner layer 7 of the bag body 1 of the beverage extraction bag P (Sample 3) and the case where the spunbond non-woven fabric layer is arranged (Sample 6), the melt-blow non-woven fabric layer is compared. It can be seen that in the case of arrangement (Sample 3), the volume of the bag 1 was maintained larger when immersed in hot water, and the stored oolong tea leaves were in a state of being sufficiently swelled.

Further, when the MD direction of the laminated non-woven fabric, that is, the direction in which the boiling water shrinkage rate is 3 to 10% is made to coincide with the direction orthogonal to both side edges of the bag body 1 (Sample 3), the MD direction of the laminated non-woven fabric is set. Comparing with the case where the direction parallel to both side edges of the bag body 1 is matched (Sample 7), the opening is larger when the direction is matched with the direction orthogonal to both side edges of the bag body 1 (Sample 3). It can be seen that 2 was in a more tightly sealed state by the outer lid piece 3.

<Leakage test of the object to be extracted using a sample of a beverage extraction bag>
(1) Preparation of sample of beverage extraction bag Sample 8: The same shape and size as the beverage extraction bag P described in "(2) Manufacture of beverage extraction bag" of the above example, and the non-woven fabric F. This is a sample created using. The melt-blown non-woven fabric layer of the non-woven fabric F is arranged as the inner layer 7 of the bag body 1, and the MD direction of the non-woven fabric F is aligned with the direction orthogonal to both side edges of the bag body 1.

(2) Test method 3.0 g of tea leaves of oolong tea are stored in the bag body 1 of the beverage extraction bag P of the above samples 2, 3, 4, and 8, respectively, and hot water in which intense convection occurs during boiling. Soaked in. Then, after 5 minutes, the tea was taken out from hot water, and the boiled oolong tea was observed to evaluate the leaked state of the tea leaves.
The evaluation criteria are as follows x and y.

x: Tea leaves have not leaked out of the beverage extraction bag.
y: Tea leaves are leaking out of the beverage extraction bag.
The test results are shown in Table 3 below.

From Table 3, the MD direction of the long-fiber non-woven fabric forming the beverage extraction bag P and the direction (left-right direction) orthogonal to both side edges of the bag 1 coincide with each other, and boiling water in the MD direction of the long-fiber non-woven fabric. If the shrinkage rate belongs to the range of 3 to 10% (samples 2, 3, 4), even if the beverage is immersed in hot water that is violently convoluted by boiling for a long time (5 minutes), it is covered from the beverage extraction bag P. It can be seen that the extract (tea leaves) does not leak out.

The beverage extraction bag according to the present invention can be suitably used in the field of extraction bags used for extracting beverages such as black tea, green tea, coffee and soup stock.

1 Bag body 2 Opening 3 Outer lid piece 4 Inner bent piece 5 Fusion part 6 Extracted object 7 Inner layer 8 Outer layer P Beverage extraction bag

Claims (3)

It is made of a polylactic acid-based resin and is formed of a long-fiber non-woven fabric having a boiling water shrinkage rate of 3 to 10% in the MD direction.
With a rectangular bag
An outer lid piece that extends to one end edge of the opening of the bag and is bent outward.
A fusion portion for fusing both side edges of the bag body and both side edges of the outer lid piece is provided.
A beverage extraction bag, characterized in that the MD direction of the long fiber non-woven fabric and the direction orthogonal to both side edges of the bag body are matched. The beverage extraction bag according to claim 1, wherein the boiling water shrinkage rate of the long-fiber non-woven fabric in the CD direction is 2% or less. 2. The described beverage extraction bag.

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