JP2002337936A - Packaging material for extraction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tea bag having a pickup thread capable of reducing troubles in manufacturing related to the pickup thread by solving a problem with tea bags having pickup thread extensively on the market that defective products are easily manufactured due to the troubles in manufacture related to the pickup thread. SOLUTION: In a packaging body for extraction comprising a water- permeable bag body formed of polyolefin nonwoven fabric or nylon cloth and the pickup thread attached to the bag body, the pickup thread is formed of a plastically formable material of a thermoplastic resin, preferably, a material in which the return angle is 20 deg. after bending it 180 deg. and 90 deg., for example, a plastically deformable polyethylene drawn filament.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an extraction package represented by a tea bag. More specifically, the present invention relates to an extraction package with a thread that can reduce manufacturing troubles caused by the thread.

[0002]

2. Description of the Related Art Green tea, black tea, oolong tea, Tochu tea and other green tea leaves, coffee powder, bonito flakes, saba flakes, etc. are used because they do not require special equipment such as tea strainers and can be used easily. Products filled with water-permeable packaging, such as dashi, kelp, dried broth, and herbal medicine, are widely used.
The extraction package filled with such an extraction material is generally immersed in hot water poured into a container and shaken finely in order to extract the active ingredient in a short time.

[0003] In order to safely perform the above operation or to quickly remove the package after extraction, a package provided with a knob is widely used. It is also common practice to provide the tag with a tag that is hooked or fixed to the upper edge of the container to prevent the thread from falling into the container during extraction.

[0004] As such an extraction package, a tetrahedral shape having excellent extraction efficiency has been used in addition to a flat shape which has been frequently used in the past. A package having a tetrahedral structure is manufactured by forming a sheet-like packaging material into a tubular shape and then sealing the tubular packaging material in two directions orthogonal to each other. Generally, one end of a pick thread is fixed to the sheet-like wrapping material of the package body by ultrasonic welding or the like, and the tag at the other end is also similarly sheet-wrapped so that the pick thread is in a tension state. It is fastened to the material. In manufacturing a package having a tetrahedral structure, the number of times the sheet is bent is large, and thus the knob thread is also bent simultaneously with this bending. However, since the thread is attached to the sheet in a tensioned state, the tensile force of the thread hinders sheet bending, so that the sheet cannot be folded into a good tetrahedral shape, and the seal line is also easily bent. For this reason, there was a problem that the defect rate increased.

A tetrahedral package is folded at an appropriate portion, and a thread is wound around the folded portion.
When stored in the outer bag, the thread is easily caught by the outer bag, and in this respect, the yield is reduced.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an extraction package which can reduce manufacturing troubles due to a pick thread even in such a tetrahedral structure package. It is in. Another object of the present invention is to
An object of the present invention is to provide an extraction package that does not cause a problem during use even if a tag is not provided on a thread.

[0007]

That is, according to the present invention, there are provided a water-permeable bag and a pick thread fastened to the bag,
An extraction package is provided, wherein the handle is made of a plastically deformable material made of a thermoplastic resin.

In a preferred embodiment of the present invention, polyethylene or a biodegradable polyester such as polylactic acid, which is excellent in water resistance and hot water resistance, is used as the plastically deformable material.

In the present invention, it is preferable that the water-permeable bag has a flat or polyhedral shape. It is preferable to use polyolefin, polyester or polyamide as the water-permeable bag material.

[0010] In the present invention, it is also preferable that the handle is fixed to the water-permeable bag by heat fusion, and that the handle is preferably folded and stored.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A water-permeable bag in an extraction package of the present invention is made of a flexible material having water permeability, and is made of a woven fabric, a nonwoven fabric, a perforated film, paper or the like. It is formed from a single layer or a laminated material. These water-permeable bags do not need to be formed entirely of the same material, but may use partially different materials.

Since it is possible to easily heat seal with the pinch thread and thus reduce the cost of attaching the pinch, it is made of a thermoplastic resin or a material containing 50% by weight or more of the thermoplastic resin. It is preferable that the woven fabric, the nonwoven fabric or the perforated film is used, and a filament woven fabric such as a gauze or a nonwoven fabric material is particularly preferable. That is, the gauze has a high-grade appearance, and the yarn is fine and coarse,
When the bag is put into hot water or when hot water is poured into the bag, there is an advantage that the hot water easily penetrates into the bag and the extraction efficiency is high. In addition, nonwoven fabrics also have excellent product appearance,
There is an advantage that a bag having high extraction efficiency can be obtained with easy adjustment of water permeability.

The thermoplastic resin used for the woven fabric, nonwoven fabric or perforated film includes ethylene, propylene,
Homopolymers or copolymers of olefins such as 1-butene, 1-hexene, 1-octene, 1-decene, 4-methyl-1-pentene, polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, polylactic acid And polyesters such as nylon 6, nylon 66, nylon 66, and nylon 6/66. The olefin copolymer may be not only a copolymer of olefins but also a copolymer of olefin and a polar monomer. In a woven fabric such as a gauze, it is preferable to use polyolefin, polyester or polyamide which is a homopolymer of olefin or a copolymer of olefins. In the case of a nonwoven fabric or a perforated film, the use of a polyolefin or polyester, which is a homopolymer of olefin or a copolymer of olefins, is most preferable in consideration of heat resistance, odorlessness, heat sealability and the like.

As the nonwoven fabric, those manufactured by various methods such as a spun bond method, a melt blow method, a dry method and a wet method can be used. The fibers constituting the nonwoven fabric need not be single fibers, but may be composite fibers such as a core-sheath type composite fiber or a side-by-side type composite fiber.

Particularly suitable bags are polyolefin nonwoven fabrics produced by spunbonding, dry process or wet process, especially nonwoven fabrics containing 50% by weight or more of propylene / ethylene random copolymer, polyolefins, especially ethylene. Or a nonwoven fabric produced by a melt blow method comprising a homopolymer or a copolymer of propylene, or a laminated nonwoven fabric in which the former nonwoven fabric layer is an outer layer and the latter nonwoven fabric layer is an inner layer. Such a bag can be heat-sealed with a polyethylene plastically deformable material suitable as a pick thread, and is excellent in appearance, feel, water permeability, and content retention, and the extraction rate is finely adjusted. This is particularly suitable because

In the case of a polyolefin nonwoven fabric layer produced by a spunbond method, a dry method or a wet method, a spunbond method is preferred when it is composed only of polyolefin fibers. Those manufactured by a method or a wet method are preferred.

The propylene / ethylene random copolymer preferably used for the spunbonded nonwoven fabric is prepared by copolymerizing propylene and ethylene in the presence of a known Ziegler-Natta type or metallocene type stereospecific polymerization catalyst. can get. This propylene / ethylene random copolymer is composed of 1
-Butene, 1-hexene, 1-octene, 4-methyl-
Another α-olefin such as 1-pentene may be copolymerized.

The ethylene content in the propylene / ethylene random copolymer is preferably 0.5 to 10
Mol%, more preferably 3 to 8 mol%. The propylene / ethylene random copolymer has a melt flow rate (230) in consideration of spinnability.
C., 2160 g load) for 15 to 100 g / 10 min, especially 25 to 70 g / 10 min.

In consideration of flexibility and water permeability, the spunbond nonwoven fabric preferably has a fineness of 4.0 d or less, particularly 0.8 to 3.0 d, and a basis weight of 4 to 30 d. 30 g / m ² , especially 8 to ²⁰ g /
m ² is preferred.

The polyolefin constituting the nonwoven fabric of the melt blow method is a propylene homopolymer or a propylene / ethylene random copolymer as described above, and has a melt flow rate (230 ° C., 2160 ° C.).
g load) of 20 to 1000 g / 10 min, ethylene homopolymer or ethylene and propylene,
-Butene, 1-hexene, 1-octene, 1-decene,
A copolymer with an α-olefin such as 4-methyl-pentene, having a density of 880 to 970 kg / m ³ and a melt flow rate (190 ° C., 2160 g load) of 20;
~ 400 g / 10 min is preferred.

The homopolymer or copolymer of propylene is obtained in the presence of a stereospecific polymerization catalyst, and the homopolymer or copolymer of ethylene is obtained by a medium-low pressure method or a high pressure method. And those produced using various catalysts such as a highly active titanium catalyst system and a metallocene catalyst system.

The nonwoven fabric of the melt blow method preferably has an average fiber diameter of about 1 to 25 μm, particularly about 1 to 5 μm, and has a basis weight of ² to 20 g / m ² , particularly ² to 10 g / m ² . preferable.

A laminated nonwoven fabric comprising a spunbonded nonwoven fabric and a meltblown nonwoven fabric can be formed into a laminate having a large delamination strength by subjecting both to a hot embossing treatment.

In the present invention, a thread composed of a plastically deformable material made of a thermoplastic resin is used as the thread. The pick thread may be not only a circular cross section but also a flat thread, a polygonal thread, or an irregular cross section having various projections. Further, a composite yarn such as a core-sheath type or a side-by-side type may be used.
In addition, as a pick thread, as the thickness of the maximum thickness portion, 0.2
It is desirable to use one having a diameter of 5 mm or more, preferably about 0.25 to 5 mm.

A plastically deformable material made of a thermoplastic resin is
It can be freely shaped and shaped at room temperature,
The form deformed by the external stress can be maintained as it is or close to it even after the stress is removed. For example, when the thread is bent at 180 degrees and 90 degrees, the return angle after 10 minutes elapses is 20.
It is preferable to use one having a degree of not more than 15 degrees, particularly not more than 15 degrees.

In general, many thermoplastic resins are excellent in elastic recovery, and it is generally difficult to maintain the shape even if deformed by external stress if the stress is removed. However, certain thermoplastic resins, such as polyethylene,
For polyolefins such as polypropylene, polyamide, polyester, polyphenylene sulfide, etc., a method of stretching at an appropriate magnification, a method of blending a large amount of an inorganic filler, a method of stretching a blended inorganic filler at an appropriate ratio, etc. It is known that plastic deformation can be imparted by either method. In the present invention, it is particularly preferred to use those based on polyolefins or polyesters, and most preferred to use those based on polyethylene.

Hereinafter, a plastically deformable material based on polyethylene will be described. As the polyethylene, use of a high-density polyethylene is particularly preferable from the viewpoints of rigidity, strength, heat deformation resistance, and the like.
It is preferable to use one having a viscosity of about 3.5 dl / g from the viewpoint of rigidity, strength, water resistance, plastic deformability and productivity.

When the polyethylene is stretched, it is elastically deformed in response to the tensile stress, the elongation increases, and the polyethylene reaches the yield point. Above the yield point, the polyethylene begins to develop plastic deformability once the tensile stress has dropped. After the yield point, the elongation stops once, reaches the limit of the internal strain, and the polyethylene gradually elongates, eventually becoming white and breaking. Those stretched to just before the breakage are completely whitened and show extremely good plastic deformability. The required stretching ratio varies depending on the thickness of the material before stretching, the stretching temperature, and the like, but is generally about 7 to 15 times. In the present invention, it is preferable to use a polyethylene material in a region exhibiting such plastic deformation obtained by drawing filaments having various cross-sectional shapes.

The whitening of the polyethylene is induced by the addition of various inorganic fillers, which can induce shear fracture and facilitate plastic deformation. Therefore, in this case, a plastically deformable material can be obtained at a lower draw ratio. Stretched products of such an inorganic filler compound that exhibit plastic deformation can also be used.

Examples of the inorganic filler which can be blended with polyethylene include talc, mica, calcium carbonate, silica,
Alumina, silica alumina, zinc oxide, magnesium oxide, titanium oxide, calcium oxide, magnesium hydroxide, aluminum hydroxide, calcium silicate, basic magnesium carbonate, glass fiber, carbon fiber, glass beads,
Examples include carbon black.

In the above drawn polyethylene yarn, the polyethylene may be drawn simply as a resin component, or may be drawn as a blend with another polyolefin. Here, examples of other polyolefins include polypropylene, poly-1-butene, poly-4-methyl-1-pentene, and the like. Such a drawn yarn based on polyethylene,
As long as plastic deformability is maintained, other thermoplastic resins, for example, other polyolefins, copolymers of ethylene and a polar monomer, polyester and the like may be a composite yarn, for example, a core-sheath type or side-by-side type composite yarn Can be used.

A plastically deformable material using such general-purpose polyethylene is described in, for example, Japanese Patent Application Laid-Open No. 7-23841.
No. 7, for example.

As the polyethylene, a plastically deformable ultrahigh molecular weight polyethylene having an intrinsic viscosity exceeding the above-mentioned range is also known (for example, JP-A-2-293407). Except for this, it has the feature of high strength and can be used sufficiently in the present invention.

For thermoplastic resins other than polyethylene, for example, polyolefins such as polypropylene, polyesters, polyamides, etc., 3 to 150 parts by weight, preferably 10 to 130 parts by weight, of inorganic or organic filler per 100 parts by weight of these resins. A plastically deformable material can be obtained by melt-extruding the blended material into a filament form and stretching it about 2 to 8 times.

Here, as the inorganic filler, those described above can be used. As organic fillers, wheat, corn and other grains, potatoes, sweet potatoes,
And starch of potatoes such as tapioca.
About the kind of these fillers and the appropriate blending amount,
It should be determined according to the type of the thermoplastic resin.

The preferred thermoplastic resin is as follows:
Examples thereof include polyolefin and polyester as described above. Specific examples of the polyester include an aromatic polyester having excellent strength and rigidity and a biodegradable aliphatic polyester. Specific examples of the aromatic polyester include polyethylene terephthalate, polytrimethylene terephthalate, and polytetramethylene terephthalate. As the aliphatic polyester, malonic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanoic acid, malic acid, tartaric acid,
Polycondensates of polyhydric carboxylic acids such as citric acid with polyhydric alcohols such as ethylene glycol, propylene glycol, butanediol, hexanediol, glycerin, and trimethylolpropane; ring-opening polymers such as lactide and caprolactone; lactic acid; Examples thereof include polycondensates of hydroxy acids such as hydroxybutyric acid and hydroxyvaleric acid. As the polyester, it is preferable to use a biodegradable polyester, for example, a polylactic acid selected from a homopolymer of lactic acid or a copolymerized polyester containing lactic acid as a main component.

Such plastically deformable thermoplastic resin materials other than polyethylene are disclosed in, for example, JP-A-3-12.
No. 4573 and JP-A-10-264961.

The fixing of the picking thread to the water-permeable bag is performed by welding such as heat sill or ultrasonic welding, bonding with an adhesive, or mechanical bonding such as mounting with a U-shaped wire. be able to.

[0039]

1 and 2 show an embodiment of the present invention. The extraction package 1 is composed of a water-permeable bag 2 having a tetrahedral structure and a plastically deformable yarn 4. The water-permeable bag 2 is made of, for example, nylon gauze, and the plastically deformable yarn 4 is made of, for example, polyethylene stretch. It is a thread. The water-permeable bag 1 is formed in a tetrahedral shape by sealing with a seal portion 3a, 3b, 3c from a sheet-like material, and a plastically deformable thread 4 is superposed on the upper surface of one surface by a seal portion 5. Sonic fusion. Even such a tetrahedral shape can be folded and stored in an outer bag, so that it does not become bulky. In addition, since the raw material for extraction is stored in a bag having a large internal volume when used, hot water And the extraction efficiency can be increased.

Even if the plastically deformable yarn 4 is fused to a sheet material, for example, a nylon gauze before forming the bag, if it is folded into two or more, there is no problem in bending the sheet material. In addition, when the bag filled with the extraction material is packed in an outer bag, it is not bulky if it is placed in a folded state as shown in FIG. If you fold and store it in the outer bag, you will not have any trouble. In the use state, the folded plastically deformable yarn 4 is stretched and shaped at a desired angle for easy operation, so that the package can be swung up, down, left and right in the extraction container. Or it can be handled freely, such as by taking it out of the extraction container. Furthermore, since it is relatively rigid and has excellent shape retention, it does not fall into the extraction container even when the pickle is released, and if necessary, its tip is bent and hooked to the edge of the extraction container,
It is possible to stably hold the package during extraction.

FIGS. 3 to 5 show another embodiment of the present invention. The extraction package 6 includes a flat water-permeable bag 7 made of, for example, a polypropylene nonwoven fabric and a plastically deformable yarn 9 made of, for example, a drawn polyethylene yarn. FIG.
As shown in FIG. 5, the water-permeable bag 7 has a folded portion 11 located substantially at the center of both sides and formed linearly along the length direction. As a result, the product can be folded into a thin flat shape to make a compact product. When using the packaging for extraction,
By expanding the folded side surface to the expanded state, the inside becomes a wide space, the contact between the extraction raw material and the hot water is performed smoothly, and the extraction efficiency is improved.

Such a water-permeable bag 7 seals the lower part of a cylindrical material having an inwardly bent portion 11 on the upper surface and the lower surface to form a sealing portion 8b, thereby forming a material to be extracted into an open bag. 12 is obtained, and the upper portion is sealed to form a seal portion 8a, thereby obtaining a flat shape.

At the center of the bag 7, a plastically deformable yarn 9 is fixed by forming a seal portion 10 by ultrasonic fusion.
Also in this case, if the plastically deformable yarn 9 is folded in advance as shown in FIG. 4, even if it is fused to the nonwoven material before forming the bag, there is no problem in processing, and The filling is not bulky, so there are few problems. In particular, if the plastically deformable yarn 9 is stored in the folded portion, the risk of occurrence of troubles is further reduced. Further, in the use state, it can be used in exactly the same manner as the extraction package of FIGS.

As is clear from the above embodiments, in the present invention, it is not necessary to provide a tag on the picking thread as in a conventional tea bag, but it is a matter of course that a tag can be provided if desired.

[0045]

According to the present invention, it is possible to provide an extraction package capable of avoiding a manufacturing trouble caused by providing a pick thread in a conventional product. Such a package for extraction does not need to be provided with a tag, and it is easy to attach a pick thread to a bag, so that it can be manufactured at low cost. Therefore, it can be used for packaging of tea leaves such as green tea, black tea, oolong tea and Tochu tea, coffee powder, shaved nodes such as bonito and saba-node, dashi kombu, boiled dried fish, herbal medicine, decoction and the like.

[Brief description of the drawings]

FIG. 1 is a perspective view of an extraction package having a tetrahedral structure.

FIG. 2 is a drawing in which the knob of the extraction package of FIG. 1 is folded.

FIG. 3 is a perspective view of an extraction package having a flat structure.

FIG. 4 is a drawing in which the knob thread of the extraction package of FIG. 3 is folded.

FIG. 5 is a sectional view of the extraction package of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extraction package 2 Water-permeable bag 4 Plastically deformable yarn 6 Extraction package 7 Water-permeable bag 9 Plastically deformable yarn

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E035 AA20 BA08 BB10 BD03 DA10 3E067 AA05 AB24 BA12A BB14A CA08 EE16 FB17 FC01 4L036 MA04 MA05 MA37 UA25

Claims (8)

[Claims] 1. An extraction package comprising a water-permeable bag and a pick thread fixed to the bag, wherein the pick thread is made of a plastically deformable material made of a thermoplastic resin. . 2. The plastically deformable material has a return angle of 20 ° or less after bending at 180 ° and 90 °.
The package for extraction according to the above. 3. The pickle thread is a plastically deformable material based on polyethylene or biodegradable polyester.
Or the package for extraction according to 2. 4. The package for extraction according to claim 3, wherein the biodegradable polyester is polylactic acid. 5. The extraction package according to claim 1, wherein the water-permeable bag has a flat or polyhedral shape. 6. The extraction package according to claim 1, wherein the water-permeable bag material is a polyolefin, polyester or polyamide. 7. The extraction package according to claim 1, wherein the handle is fixed to the water-permeable bag by heat fusion. 8. The extraction package according to claim 1, wherein the handle is folded.