JP4281890B2 - Packaging for extraction - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of an extraction package represented by a tea bag. More specifically, the present invention relates to an extraction package with a picked-up thread that can reduce manufacturing troubles based on the picked-up thread.
[0002]
[Prior art]
It does not require special equipment such as tea strainers and can be used easily, tea leaves such as green tea, black tea, oolong tea, and chuchu tea, shavings such as coffee powder, bonito and bonito, dashi kelp, boiled dried In addition, products in which permeable packagings are filled with herbal medicines are widely used. In general, an extraction package filled with such an extraction raw material is immersed in hot water poured into a container and shaken finely in order to extract an active ingredient in a short time.
[0003]
In order to perform the above operation safely or to quickly remove the package after extraction, a package having a picked thread is widely used. It is also common practice to provide a tag for hooking or fixing the picking thread to the upper edge of the container so that the picking thread does not fall into the container during extraction.
[0004]
As such an extraction package, a tetrahedron having excellent extraction efficiency has been used in addition to the flat one that has been frequently used. A tetrahedral structure package is manufactured by forming a sheet-like packaging material into a cylindrical shape and then sealing in two directions orthogonal to the cylindrical packaging material. In the sheet-like packaging material of the packaging material, one end of the picking thread is generally fastened by ultrasonic welding or the like, and the tag on the other end is similarly wrapped so that the picking thread is in a tension state. It is fixed to the material. In manufacturing a tetrahedron package, the number of times the sheet is folded is large, and the picking thread is folded at the same time as this folding. However, since the picking thread is attached to the sheet in a tensioned state, the pulling force of the picking thread hinders the sheet from being folded and cannot be folded into a good tetrahedral shape, and the seal line is also easily bent. For this reason, there has been a problem that the defect rate increases.
[0005]
In addition, the tetrahedron package is folded at an appropriate portion, and the thread is wound around it. However, when stored in the outer bag, the thread is easily caught by the outer bag. There was a problem that decreased.
[0006]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide an extraction package that can reduce manufacturing troubles based on the picked thread even in such a tetrahedral package. Another object of the present invention is to provide an extraction package that does not cause problems during use even if a tag is not provided on the picked thread.
[0007]
[Means for Solving the Problems]
That is, the present invention comprises a water-permeable bag and a picking thread fastened to the bag, and the picking thread is made of a polyethylene-based thermoplastic resin, and the return angle after bending at 90 degrees and 90 degrees is 20 degrees. An object of the present invention is to provide an extraction package characterized in that it is composed of the following plastically deformable material.
[0008]
In a preferred embodiment of the present invention, a plastic deformable material is used which is based on polyethylene or biodegradable polyester, such as polylactic acid, which is excellent in water resistance and hot water resistance.
[0009]
In the present invention, it is preferable to use a water-permeable bag having 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 picking thread is fastened to the water-permeable bag body by heat-sealing, and that the picking thread is folded and stored.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The water permeable bag in the extraction packaging of the present invention is composed of a flexible material having water permeability, and is made of a single layer or laminated material such as a woven fabric, a nonwoven fabric, a perforated film, and paper. Is formed. These water-permeable bags do not need to be formed of the same material for the entire bag, and partially different materials can be used.
[0012]
A knitted fabric composed of a thermoplastic resin or a material containing 50% by weight or more of a thermoplastic resin, because it can be easily heat-sealed with the picked yarn, and the attachment cost of the picked yarn can be reduced. It is preferably composed of a cloth, a nonwoven fabric or a perforated film, and a filament woven fabric such as a cocoon or a nonwoven fabric material is particularly preferred. In other words, the bag has a high-grade appearance, and since the thread is thin and the eyes are coarse, when the bag is put into hot water or when hot water is poured into the bag, Has the advantage of being easily penetrated and having high extraction efficiency. In addition, the nonwoven fabric has an excellent product appearance and has an advantage that a bag body with easy adjustment of water permeability and high extraction efficiency can be obtained.
[0013]
As a thermoplastic resin used for a woven fabric, a non-woven fabric or a perforated film, olefins such as ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 4-methyl-1-pentene alone are used. Polymers or copolymers, polyethylene terephthalate, polytrimethylene terephthalate, polytetramethylene terephthalate, polyester such as polylactic acid, polyamide such as nylon 6, nylon 66, nylon 6/66, and the like are suitable. The olefin copolymer may be not only a copolymer of olefins but also a copolymer of an olefin and a polar monomer. In a woven fabric such as a kite, it is preferable to use a polyolefin, polyester or polyamide which is a homopolymer of olefin or a copolymer of olefins. For nonwoven fabrics and perforated films, polyolefins or polyesters, which are homopolymers of olefins or copolymers of olefins, are most preferred in view of heat resistance, odorlessness, heat sealability and the like.
[0014]
As the nonwoven fabric, those produced by various methods such as a spunbond method, a melt blow method, a dry method, and a wet method can be used. Moreover, the fiber which comprises a nonwoven fabric does not need to be a single fiber, and composite fibers, such as a core sheath type composite fiber and a side-by-side type composite fiber, may be sufficient.
[0015]
Particularly suitable as a bag is a polyolefin nonwoven fabric produced by a spunbond method, a dry method or a wet method, particularly a nonwoven fabric containing 50% by weight or more of a propylene / ethylene random copolymer, a polyolefin, particularly ethylene or propylene. It is a non-woven fabric manufactured by a melt blow method comprising a homopolymer or a copolymer, or a laminated non-woven fabric configured so that the former non-woven fabric layer is an outer layer and the latter non-woven fabric layer is an inner layer. Such a bag body can be heat-sealed with a polyethylene plastic deformable material suitable as a picking thread, is excellent in appearance, feel, water permeability and content retention, and finely adjusts the extraction speed. Is particularly suitable.
[0016]
In the polyolefin nonwoven fabric layer produced by the spunbond method, dry method or wet method, the spunbond method is preferable when it consists of polyolefin fibers alone, and when it consists of polyolefin fibers and natural fibers, the dry method or wet method is preferred. Those produced by the process are preferred.
[0017]
The propylene / ethylene random copolymer preferably used for the spunbonded nonwoven fabric is obtained by copolymerizing propylene and ethylene in the presence of a known Ziegler-Natta type or metallocene type stereospecific polymerization catalyst. In this propylene / ethylene random copolymer, in addition to propylene and ethylene, other α-olefins such as 1-butene, 1-hexene, 1-octene, 4-methyl-1-pentene may be copolymerized. .
[0018]
The ethylene content in this propylene / ethylene random copolymer is preferably 0.5 to 10 mol%, and more preferably 3 to 8 mol%. Further, this propylene / ethylene random copolymer preferably has a melt flow rate (230 ° C., 2160 g load) of 15 to 100 g / 10 min, particularly 25 to 70 g / 10 min in consideration of spinnability.
[0019]
In consideration of flexibility and water permeability, the spunbonded nonwoven fabric preferably has a fineness of the constituent fibers of 4.0 d or less, particularly 0.8 to 3.0 d, and a basis weight of 4 to 30 g / m. ² and particularly preferably 8 to ²⁰ g / m ² .
[0020]
The polyolefin constituting the melt blown nonwoven fabric is a propylene homopolymer or a propylene / ethylene random copolymer as described above, and a melt flow rate (230 ° C., 2160 g load) of 20 to 1000 g / 10 min. Or an ethylene homopolymer or a copolymer of ethylene and an α-olefin of propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 4-methyl-pentene, etc., having a density Is preferably 880 to 970 kg / m ³ and a melt flow rate (190 ° C., 2160 g load) of 20 to 400 g / 10 minutes.
[0021]
The propylene homopolymer or copolymer is obtained in the presence of a stereospecific polymerization catalyst, and the ethylene homopolymer or copolymer is obtained by a medium-low pressure method or a high-pressure method. In addition, it may be produced using various catalysts such as a highly active titanium catalyst system and a metallocene catalyst system.
[0022]
As the nonwoven fabric of the melt blow method, those having an average fiber diameter of about 1 to 25 μm, particularly about 1 to 5 μm are preferable, and those having a basis weight of ² to 20 g / m ² , particularly ² to 10 g / m ² are preferable.
[0023]
A laminated nonwoven fabric composed of a spunbond nonwoven fabric and a melt blown nonwoven fabric can be made into a laminate having high delamination strength by subjecting both to hot embossing.
[0024]
In the present invention, the needle thread is made of a plastically deformable material made of a thermoplastic resin. The picking thread is not limited to a circular cross-sectional shape, but may be a flat shape, a polygonal shape, a modified cross-section having various protrusions, or the like. Further, a composite yarn such as a core-sheath type or a side-by-side type may be used. Further, as the picking thread, it is desirable to use a thread having a maximum thickness of 0.25 mm or more, preferably about 0.25 to 5 mm.
[0025]
A plastically deformable material made of a thermoplastic resin can be freely shaped and shaped at room temperature, and can maintain a shape deformed by an external stress as it is or after the stress is removed. Is. For example, it is preferable to use a thread having a return angle of 20 degrees or less, particularly 15 degrees or less after 10 minutes when the knob is bent at 180 degrees and 90 degrees.
[0026]
In general, many thermoplastic resins are excellent in elastic recovery, and even if they are deformed by external stress, it is difficult to maintain the form if the stress is removed. However, in certain types of thermoplastic resins such as polyolefins such as polyethylene and polypropylene, polyamides, polyesters, polyphenylene sulfide, etc., a method of stretching at an appropriate magnification, a method of blending a large amount of inorganic filler, and a blend of inorganic filler It is known that plastic deformability can be imparted by any method such as a method of stretching an object at an appropriate magnification. In the present invention, those based on polyolefin or polyester are particularly preferred, and those based on polyethylene are most preferred.
[0027]
Hereinafter, a plastically deformable material based on polyethylene will be described. As polyethylene, it is particularly preferable to use high-density polyethylene from the viewpoints of rigidity, strength, heat distortion resistance, etc. Especially, it is preferable to use one having an intrinsic viscosity of about 1.0 to 3.5 dl / g. From the viewpoint of water resistance, plastic deformation and productivity.
[0028]
When the polyethylene is stretched, it is elastically deformed according to the tensile stress, the elongation increases, and the yield point is reached. When the yield point is exceeded, the tensile stress decreases once, and then the polyethylene starts to develop plastic deformability. After the yield point, after the elongation is temporarily stopped, the limit of internal strain is reached, and the polyethylene gradually grows, eventually whitening and breaking. Those stretched to just before the break are completely whitened and exhibit very good plastic deformability. The necessary draw ratio varies depending on the material thickness before drawing, the drawing temperature, and the like, but is generally about 7 to 15 times. In the present invention, it is preferable to use a polyethylene material having such plastic deformability obtained by stretching filaments having various cross-sectional shapes.
[0029]
This whitening of polyethylene can be induced by adding various inorganic fillers, thereby inducing shear fracture and facilitating plastic deformation. Therefore, in this case, a plastically deformable material can be obtained at a lower draw ratio. A stretched product of such an inorganic filler compound that exhibits plastic deformability can also be used.
[0030]
Examples of the inorganic filler that 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, and base. Examples thereof include basic magnesium carbonate, glass fiber, carbon fiber, glass bead, and carbon black.
[0031]
In the above drawn polyethylene yarn, the polyethylene may be a simple stretched resin component, or may be a stretched product blended with another polyolefin. Examples of other polyolefins include polypropylene, poly-1-butene, and poly-4-methyl-1-pentene. Such drawn yarns based on polyethylene may be composite yarns with other thermoplastic resins, such as other polyolefins, copolymers of ethylene and polar monomers, polyesters, etc., as long as the plastic deformability is maintained. For example, a core-sheath type or a side-by-side type composite yarn can be used.
[0032]
Such plastically deformable materials using general-purpose polyethylene are described in, for example, JP-A-7-238417.
[0033]
Also known as polyethylene is an ultra-high molecular weight polyethylene whose plastic viscosity exceeds the above range (for example, JP-A-2-293407), which is difficult to produce and expensive. Except for, it has a characteristic of high strength and can be used sufficiently in the present invention.
[0034]
For thermoplastic resins other than polyethylene, for example, polyolefins such as polypropylene, polyesters, polyamides, etc., 3 to 150 parts by weight of inorganic or organic filler, preferably about 10 to 130 parts by weight, are blended per 100 parts by weight of these resins. A plastically deformable material can be obtained by melt-extruding the material into a filament shape and stretching it about 2 to 8 times.
[0035]
Here, as the inorganic filler, those described above can be used. Examples of organic fillers include grains such as wheat and corn, starches of potatoes such as potato, sweet potato and tapioca. About the kind of these fillers, and its suitable compounding quantity, it should be determined according to the kind of thermoplastic resin.
[0036]
Preferred examples of the thermoplastic resin include polyolefins and polyesters as described above. Specific examples of the polyester include aromatic polyesters and biodegradable aliphatic polyesters having excellent strength and rigidity. Specific examples of the aromatic polyester include polyethylene terephthalate, polytrimethylene terephthalate, and polytetramethylene terephthalate. Aliphatic polyesters include malonic acid, succinic acid, glutaric acid, adipic acid, sebacic acid, dodecanoic acid, malic acid, tartaric acid, citric acid and the like, and ethylene glycol, propylene glycol, butanediol, hexane. Examples include polycondensates with polyhydric alcohols such as diol, glycerin and trimethylolpropane, ring-opening polymers such as lactide and caprolactone, polycondensates of hydroxy acids such as lactic acid, hydroxybutyric acid and hydroxyvaleric acid. it can. 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 copolyester having lactic acid as a main component.
[0037]
Such plastic deformable materials of thermoplastic resins other than polyethylene are described in, for example, JP-A-3-124573 and JP-A-10-264961.
[0038]
Fastening of the picking thread to the water-permeable bag can be performed by welding such as heat sill or ultrasonic fusion, bonding with an adhesive, or mechanical connection such as attachment with a U-shaped needle fitting. .
[0039]
【Example】
1 and 2 are drawings showing an embodiment of the present invention. The extraction packaging body 1 is composed of a water-permeable bag body 2 having a tetrahedral structure and a plastically deformable thread 4, and the water-permeable bag body 2 is made of nylon nylon, for example, and the plastically deformable thread 4 is made of, for example, polyethylene stretched It is a thread. The water-permeable bag 1 is formed into a tetrahedron shape by sealing with a seal portion 3 a, 3 b, 3 c from a sheet-like material. Sonic welded. Such a tetrahedron shape can be folded and stored in the outer bag, so that it does not become bulky. In use, the extraction raw material is stored in a bag having a large inner volume. The extraction efficiency can be increased.
[0040]
Even if the plastically deformable yarn 4 is fused to a sheet material, for example, a nylon bag, before forming the bag body, if it is folded into two or more, there is no problem in bending the sheet material. Even when the outer bag is filled with the extraction material, it does not become bulky if it is folded as shown in FIG. 2, and in particular, the package is folded so as to be stored in the folded portion of the package 1, If you put it in an outer bag, you won't have any trouble. In use, the folded plastically deformable yarn 4 is stretched and shaped at a desired angle so that the operation is easy. Or, it can be handled freely such as taking out from the extraction container. Furthermore, since it is relatively rigid and has excellent shape retention, it does not fall into the extraction container even if it is released, and if necessary, the tip is bent and hooked onto the edge of the extraction container. It is possible to hold the inside package stably.
[0041]
3 to 5 show other embodiments of the present invention. The extraction packaging 6 includes a flat water-permeable bag 7 made of, for example, a polypropylene nonwoven fabric, and a plastic deformable yarn 9 made of, for example, polyethylene drawn yarn. As shown in FIG. 5, the water-permeable bag body 7 has a folded portion 11 that is positioned substantially at the center of both side surfaces and formed linearly along the length direction, and the left and right side surfaces are folded portions 15. Folded up and down at the border, it becomes a thin flat shape and can be a compact product. When the extraction packaging is used, the folded side surface is extended and brought into an unfolded state so that the interior becomes a wide space, the contact between the extraction raw material and hot water is performed smoothly, and the extraction efficiency is improved.
[0042]
Such a water-permeable bag body 7 is filled with the extraction material 12 in the open bag obtained by sealing the lower part of the cylindrical material having the inwardly-folded portions 11 on the upper surface and the lower surface to form the seal portion 8b. Then, the upper portion is sealed to form the seal portion 8a, thereby obtaining a flat shape.
[0043]
In the center of the bag body 7, a plastically deformable thread 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, there is no problem in processing even if the plastic deformable yarn 9 is fused to the non-woven fabric material before forming the bag body. When filling, there is little problem because it is not bulky. In particular, if the plastic deformable yarn 9 is accommodated in the folding portion, the risk of occurrence of trouble is further reduced. Moreover, in the state of use, it can be used in exactly the same way as the packaging for extraction of FIGS.
[0044]
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 the case of a conventional tea bag, but it is of course possible to provide a tag if desired.
[0045]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the packaging body for extraction which can avoid the trouble on manufacture which had arisen by providing a pick thread in the conventional product can be provided. Such an extraction package can also be manufactured at low cost because it is not necessary to provide a tag and it is easy to attach the picked thread to the bag. Therefore, it can be used for the packaging of tea leaves such as green tea, black tea, oolong tea, and chuchu tea, shavings such as coffee powder, bonito and bonito, dashi kelp, niboshi, traditional Chinese medicine, and decoction.
[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 a pick thread of the extraction packaging body of FIG. 1 is folded.
FIG. 3 is a perspective view of an extraction packaging body having a flat structure.
4 is a drawing obtained by folding the picking thread of the extraction packaging body of FIG. 3. FIG.
5 is a cross-sectional view of the extraction packaging body of FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Extraction packaging body 2 Water-permeable bag body 4 Plastic deformation thread 6 Extraction packaging body 7 Water-permeable bag body 9 Plastic deformation thread

Claims (5)

It consists of a water-permeable bag body and a pick thread fastened to the bag body, and the pick thread is made of a polyethylene-based thermoplastic resin and has a return angle of 20 degrees or less after bending at 90 degrees and 90 degrees. An extraction package comprising a plastically deformable material. 2. The extraction packaging body according to claim 1, wherein the water-permeable bag body is a flat or polyhedral one. The packaging material for extraction according to claim 1 or 2, wherein the material of the water-permeable bag is polyolefin, polyester or polyamide. The extraction package according to any one of claims 1 to 3, wherein the picking thread is fixed to the water-permeable bag body by heat fusion. The extraction package according to any one of claims 1 to 4, wherein the knob is folded.

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