JP2010042234A - Drip bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drip bag which prevents a paper base material having a single-layer or multi-layer paperboard structure used for a locking part from being stained with coffee filled in a water permeable filtering sheet in a drip bag stored in the evaporated aluminum film bag and also prevents hot water or coffee liquid from being absorbed in the paper base material when dripping coffee. <P>SOLUTION: The drip bag has a water permeable filtering sheet bag body having an opening at its upper end and a locking part located on the two outer surfaces opposing the bag body. The locking part comprises the paper base material having a single-layer or multi-layer board paper structure with a wet paper strength reinforcing agent. On the back and front sides of the paper base material, a water-soluble polymer is applied and the cross-sectional water absorption of the locking part is preferably 1.0 g/1,000 mm<SP>2</SP>or less. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a wand drip coffee (hereinafter referred to as a drip bag) that can be easily put into a drip coffee by being hooked on an upper part of a container such as a cup. More specifically, the present invention provides a latching member having a good water resistance with less color derived from the coffee component on the paper base material, which is a latching member bonded to the side surface of the bag body.

Conventionally, the paper drip method has become widespread as a method of putting coffee that makes it easy to enjoy authentic coffee. In this paper drip method, usually a few cups of coffee are extracted at a time. On the other hand, in recent years, the number of people living alone has increased, and the number of members of one family has decreased due to the nuclear family and the decline in the birth rate. Therefore, instead of the paper drip method, which is based on the conventional method of extracting several cups of coffee at once, disposable drip bags that can easily extract one cup of coffee are available in various product forms. On the market.

Among them, as a simple configuration, a bag body made of a water-permeable filterable sheet containing coffee powder, and paper bonded to the side surface of the bag body to hang the bag body on a cup There is a drip bag made of a hook member made of a product or the like. This drip bag can save resources of the forming material and can be manufactured at low cost. In addition, the product can be made compact. (Patent Document 1, Patent Document 2)
JP 2004-230143 A JP 2004-357929 A

This drip pack may be stored in the aluminum vapor deposition film bag filled with nitrogen gas one bag at a time and stored for a long time in a highly sealed state, which may cause a new problem. For example, a paper hooking member used in a drip bag turns brown due to a coffee component, and the consumer cannot feel freshness. Or when it is opened and used after long-term storage, the paper-made latching member may be peeled off in the paper layer, impeding practical use.

The present invention relates to a drip bag stored in an aluminum vapor-deposited film bag, a paper base having a single-layer or multi-layer paperboard structure used as a hanging member with a coffee component filled in a water-permeable filterable sheet. An object of the present invention is to provide a drip back that can suppress the coloring of the material and prevent the hot water or coffee liquid during the coffee drip from being absorbed by the paper base material.

In the drip bag stored in the aluminum vapor-deposited film bag, the inventors generate coloring on the front and back surfaces of the hanging member made of single-layer / multi-layer paperboard bonded to the side surface of the bag body of the drip bag. As a result of earnestly verifying the phenomenon, it was found that the cause of coloring is a vaporization component derived from coffee, and coloring can be suppressed by providing high barrier layers on the front and back surfaces so that the vaporization component does not enter the inside of the paper substrate. . Further, the present inventors have found that the paper base material can be softened and delamination can be prevented by enhancing the water resistance so that liquid such as hot water or coffee liquid at the time of coffee drip does not penetrate into the paper base material. .

That is, the present invention includes the following.
(1) A drip bag provided with a water-permeable filterable sheet bag main body having an opening at the upper end and a hooking member disposed on the two outer surfaces facing the bag main body, the hooking member being wet paper A drip bag comprising a paper base material having a single-layer or multi-layer paperboard structure containing a force enhancer, wherein a water-soluble polymer is coated on the front and back surfaces of the paper base material.

(2) The drip bag according to (1), wherein the water-soluble polymer is polyvinyl alcohol.

(3) The drip bag according to any one of (1) and (2), wherein the wet paper strength enhancer is a polyamide polyamine / epichlorohydrin resin.

(4) The drip bag according to any one of (1) to (3), wherein the hooking member has a cross-section water absorption of 1.0 g / 1000 mm ² or less.

(5) The drip bag according to any one of (1) to (4), wherein a water-resistant base material is provided on at least one surface of the hooking member.

(6) The drip bag according to (5), wherein the water-resistant base material is a polyolefin resin or a saturated polyester resin.

The drip bag of the present invention is a color derived from the coffee component on the front and back surfaces of the hanging member made of single-layer / multi-layer paperboard bonded to the side surface of the bag body of the drip bag while being stored in the aluminum vapor-deposited film bag. It is possible to prevent the occurrence of the occurrence of a sense of discomfort to the consumer.
In addition, by strengthening water resistance so that water such as coffee drip or liquid such as coffee liquid does not penetrate into the paper base material, the paper base material can be softened and delamination can be prevented, and the function of the retaining member is sufficient Has an effect that can be demonstrated.

In the present invention, it is important to provide a barrier layer on the front and back surfaces of the paper substrate using a surface treatment agent containing a water-soluble polymer. By providing the barrier layer, it is possible to suppress the coloring component vaporized from the coffee powder filled in the water-permeable filterable sheet bag of the drip bag from penetrating into the surface or inside of the paper base material and being colored, which is preferable. On the other hand, when the barrier layer cannot be uniformly provided on the paper surface, the vaporized component can freely pass through, so that it is adsorbed on the surface of the pulp fiber or at the intersection, and coloring is not preferable.

The water-soluble polymer that is the surface treatment agent of the present invention is polyvinyl alcohol, starch, polyacrylamide, acrylic resin, styrene-butadiene resin, styrene-isoprene resin, polyester resin, ethylene-vinyl acetate resin, acetic acid. Examples of the vinyl-vinyl alcohol-based resin, urethane-based resin, and fluorine-based resin include polyvinyl alcohol in the present invention. Polyvinyl alcohol is preferred because it is inexpensive and rich in barrier performance, and is safe for food applications and has good suitability for coating on the substrate surface.

Among polyvinyl alcohols, the higher the degree of polymerization, the better because it is difficult for the vaporizable gas derived from the coffee component to permeate. Those having a degree of polymerization of 1000 to 2500, more preferably 1500 to 2000 are preferred because of a good balance between barrier properties and permeability. A grade having a higher saponification degree is preferable because water resistance is increased, and a completely saponified product having a saponification degree of 98 to 99 is more preferable.

In the present invention, as means for coating and impregnating the surface treatment agent on the substrate surface, for example, a bar coater, a blade coater, an air knife coater, a rod coater, a gate roll coater, a roll coater such as a size press and a calendar coater, Examples thereof include a bill blade coater and a bell vapor coater, but are not particularly limited in the present invention.

The surface treatment agent is preferably applied or impregnated in an amount of 0.1 to 1.0 g / m ² or less. If a large amount is applied or impregnated, it is possible to penetrate deeper than the surface depending on the viscosity, but this is economically disadvantageous.

It is preferable that the latch member made of the paper base material of the drip bag of the present invention is water-resistant with a wet paper strength agent. Hot water is poured into the coffee powder filled in the water-permeable filterable sheet, and the paper base of the drip bag is softened by the coffee liquid extracted in the cup, or delamination occurs in the case of a multi-layer board structure. Therefore, a problem that the function as a latching member is not achieved occurs. Sufficient sizing can be obtained with internal chemicals such as rosin sizing agents and alkyl ketene dimers that are generally used as sizing agents, but when colored components evaporated from coffee powder adhere to the paper substrate, There is a case where the size degree is suddenly reduced. The wet paper strength agent added to the pulp slurry covers and protects the water-bonding hydrogen bonding regions that are formed between cellulose molecules, or is three-dimensionalized by a curing reaction between resins within the hydrogen bonding regions. When the colored component adheres to the paper base, it has a mesh structure and prevents the fibers from swelling and interfacial hydrogen bonds from breaking due to water molecules that have entered and fixed the fibers, and can provide wet strength. However, it does not cause the above problems.

Wet paper strength agents commonly used in the paper industry include melamine-formaldehyde and urea-formaldehyde resins and polyamide polyamines, which react with urea or melamine with formaldehyde to produce methylolated dimethylolurea or trimethylolmelamine. -Epichlorohydrin resin, polyethyleneimine, etc. are mentioned. In the present invention, it is particularly preferable to use a polyamide polyamine / epichlorohydrin resin, which is a non-formaldehyde resin, which has much better wet strength than urea and melamine resins.

The addition amount of the wet paper strength agent is preferably 0.1 to 0.5% by mass, and preferably 0.1 to 0.3% by mass with respect to the absolute dry mass of the pulp. More preferred. If it is less than 0.1% by mass, the wet strength is weak and the water resistance is poor. Even if it is added more than 0.5% by mass, a great improvement in water resistance cannot be expected.

It is preferable that the cross-section water absorption of the retaining member made of the paper base material of the drip bag of the present invention is 1.0 g / 1000 mm ² or less. If water is absorbed more than 1.0 g / 1000 mm ² , the paper base material becomes soft and delamination occurs, and the function of the latch member cannot be exhibited.

In order to improve water resistance, it is preferable to provide a water-resistant base material on the front and back surfaces of the latch member made of the paper base material of the drip bag of the present invention. By providing a water-resistant base material, it is possible to prevent liquid such as hot water or coffee liquid during coffee drip from permeating from the front and back surfaces of the paper base material.

As a base material for water resistance, low density polyethylene, medium density polyethylene, polyethylene such as high density polyethylene, polyolefin resin such as polypropylene and polymethylpentene, saturated polyester resin such as polyethylene terephthalate and polybutylene terephthalate, nylon, etc. Polyamide resin, ethylene vinyl alcohol copolymer, polystyrene resin, polyacrylonitrile resin and the like can be arbitrarily used. Among these, the polyolefin-based resin is inexpensive and is preferably used in terms of adhesion to the base material and manufacturability. Saturated polyester resins are preferable because they are expensive but have low gas permeability and thus have a large effect of suppressing vaporizable gas. The method for providing the water-resistant substrate on the front and back surfaces of the paper substrate may be any method such as wet lamination, hot melt lamination, extrusion lamination, dry lamination, and thermal lamination, and is not particularly limited. 5-50 micrometers is preferable and, as for the thickness of the base material for water resistance, 15-35 micrometers is still more preferable. When the thickness of the substrate is less than 5 μm, the water resistance effect is poor and the film strength is also insufficient. If it is thicker than 50 μm, it is uneconomical and may adversely affect the hook member processing.

The bag body made of the water-permeable filterable sheet of the present invention can use various bags as long as coffee can be extracted when a predetermined amount of coffee powder is filled and hot water is poured. For example, synthetic fibers such as polyester, nylon, polyethylene, polypropylene, and vinylon, regenerated cellulose such as rayon, and woven or non-woven fabrics made of wood pulp or non-wood pulp and synthetic fibers are known. A water-permeable filterable sheet can be obtained using a woven fabric or a non-woven fabric.

The raw material pulp used for the hanging member comprising the paper base material of the drip bag of the present invention is not limited as long as it improves the permeability of the surface treatment agent and forms a uniform barrier layer on the surface. For example, chemical pulp (hardwood, conifer), mechanical pulp, waste paper pulp, non-wood fiber pulp, synthetic pulp, and the like can be used. These pulps may be used alone or in combination of two or more.

In the present invention, the above-described various pulps can be used, but it is preferable to use hardwood bleached kraft pulp (LBKP) in order to make the void structure of the surface layer uniform and improve the penetration of the surface treatment agent. Since the softwood bleached kraft pulp has a wide fiber width and prevents the surface treatment agent from penetrating, the blending ratio of the softwood bleached kraft pulp is preferably 50% or less, and more preferably 30% or less.

In order to provide a uniform barrier layer on the front and back surfaces of the paper substrate with the surface treatment agent, the ratio of lumen width (L1) / fiber width (L2) of hardwood bleached kraft pulp (LBKP) used for the surface layer is 0.40 or less. It is preferable to arrange the pulp fiber. As a result of the uniform morphology of the pulp fibers due to the small L1 / L2 ratio, the gaps between the networks of the pulp fibers are uniform, and the surface treatment agent can be applied uniformly. If a pulp fiber having an L1 / L2 ratio larger than 0.4 is disposed, it is not preferable because the fiber width is wide and the penetration of the surface treatment agent is hindered. As the pulp having an L1 / L2 ratio of 0.40 or less, a pulp manufactured from grandis, saligna, globulas as the eucalyptus material, and melancy as the acacia material is preferable. Pulp produced from these grades has 10% or less of short fibers called fine fractions having a number average fiber length of 0.1 mm or less as measured by Kajaani fiber length distribution. It is suitable for coating.

In the present invention, it is preferable to use a raw material pulp having a freeness in the range of 200 to 650 ml according to the Canadian standard form of JIS P 8121. When the freeness is less than 200 ml, the pulp fibers are poorly drained, so that the surface of the squeezed paper tends to become dense and the penetration of the surface treatment agent is hindered. On the other hand, if the freeness exceeds 650 ml, the paper surface becomes rough and the surface treatment agent permeates too much. Further, the pH at the time of papermaking in the present invention can be arbitrarily selected as necessary in the neutral papermaking region from about 4.5 to about 6 to 8 which is acidic papermaking.

In the present invention, various internal additives can be used as necessary. For example, water-repellent agents such as fluororesins, polyamide resins, wax emulsions, rosin sizing agents, styrene / maleic acid, alkyl ketene dimers, alkenyl succinic anhydride, and other internal sizing agents for natural and synthetic papermaking, Various paper strength enhancers, starches, drainage yield improvers, water resistance agents, antifoaming agents, fillers such as talc, dyes, and the like can be used.

The basis weight of the latch member made of the paper base material of the drip bag of the present invention needs to be about 100 to 300 g / m ² because a certain degree of rigidity is required as a function of the latch member. Since it is in such a basis weight range, as the papermaking method, multilayer papermaking which is easy to obtain a texture is preferable.

The paper machine for producing the drip bag of the present invention, the processing machine for surface treatment, etc. are not particularly limited. For example, paper is made by single layer or paper making on a long paper machine, a short paper machine, or a circular paper machine, and the drip bag is processed by adding or coating chemicals as described above, and the front and back surfaces are processed. Manufactured.

EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by these. In addition, the numerical value which shows a mixing | blending, a density | concentration, etc. is a numerical value of the solid content or the mass reference | standard of an active ingredient. In addition, the papers made for all the examples were pretreated according to JIS P8111 and then subjected to a coloring test. The details of the test conditions for colorability are as follows.

<Colorability test method>
The paper machine flow direction of the base material for a latching member manufactured in Examples and Comparative Examples was vertical, the direction perpendicular to the flow direction was horizontal, and a paper base material having a length of 7 cm and a width of 5 cm was collected. In accordance with JIS P 8150, L ^* , a ^* , b ^* are measured from the CIE tristimulus values on the front and back surfaces of the paper base material before the test using a spectral whiteness colorimeter SC-10WN Suga Test Instruments Co., Ltd. . 7 g of commercially available regular coffee powder (Blendy) is put into a glass bottle (manufactured by Nippon Yamamura Glass, mayonnaise 450, capacity 477 ml). Next, the paper base is suspended with a clip or the like at the center of the inner lid of the glass bottle, and the outer lid is attached. A glass bottle sealed with a lid is stored in a constant temperature heater at 60 ° C. for one week. After completion of storage, the paper substrate is taken out and L ^* , a ^* , b ^* are measured in the same manner as described above.
From the difference before and after the test, ΔL ^* , Δa ^* , Δb ^* , the color difference ΔE is calculated by the following equation.

<Coloring evaluation>
The degree of coloring on the front and back surfaces is confirmed visually.
○: Little coloring.
Δ: Slightly colored
X: There is much coloring.

<Cross section water absorption>
The paper machine flow direction of the base material for a latching member manufactured in Examples and Comparative Examples is vertical, and the direction perpendicular to the flow direction is horizontal, and is cut into 9 cm in length and 6 cm in width. After carrying out the coloring test described above, the thickness T (mm / 100) of the paper substrate is measured according to JIS P 8118, and then the weight W ₁ (mg) is measured with an electronic balance. After immersing in water having a depth of 5 cm for 90 seconds, the water adhering to the film surface (water-resistant substrate surface) is wiped off with filter paper and the weight W ₂ (mg) is measured again. Cross water absorbency M a (g / 1000mm ²⁾ is calculated by the following equation.

<Delamination>
The cross-section after the cross-section water absorption test is visually confirmed.
○: No delamination occurs.
Δ: Some delamination occurred.
X: Delamination occurred frequently and softened.

<Example>
Example 1
Pulp was used properly for the front, middle and back layers, and LBKP 100% was beaten for the front and back layers to prepare a 400 ml Canadian standard freeness pulp slurry. For the middle layer, mixing beating was performed with a blend of NBKP 20% and LBKP 80% to prepare a 350 ml Canadian standard freeness pulp slurry. A sulfuric acid band was added to each pulp slurry to adjust the pH to 4.5, and rosin sizing agent (size pine N-771 manufactured by Arakawa Chemical Industries, Ltd.) as an internal sizing agent was added to 0.2% of pulp. Polyacrylamide (Polystron-1250 manufactured by Arakawa Chemical Industry Co., Ltd.) as a paper strength enhancer and 0.3% of pulp, and polyamide polyamine epichlorohydrin resin (manufactured by Seiko PMC Co., Ltd.) as a wet paper strength enhancer. WS-4024) was added at 0.3% to pulp. The pulp slurries with the above conditions were combined with a circular paper machine at a surface layer of 50 g / m ² , a middle layer of 120 g / m ² , and a back layer of 50 g / m ² , and each surface was treated with a champion coater installed on the paper machine. After applying 0.20 g / m ^{2 of} polyvinyl alcohol (Nippon Synthetic Chemical Co., Ltd. P7000 complete saponification high degree of polymerization), which is an agent, smoothing with a calendar and hanging a drip bag with a basis weight of 220 g / m ² A paper base for the stop member was produced. A low-density polyethylene resin (Novatec LD LC522, melting point 111 ° C., manufactured by Nippon Polyethylene Co., Ltd.), which is a water-resistant base material, is bonded to a paper base material by a thickness of 20 μm by an extrusion lamination method to produce a base material for a retaining member. In addition, the colorability, the cross-section water absorption, and the state of delamination were observed.

Example 2
A pulp slurry similar to that of Example 1 was adjusted to pH 6.0 using a sulfuric acid band, and an alkyl ketene dimer sizing agent (AD-1606 manufactured by Seiko PMC Co., Ltd.) was used as an internal sizing agent. A paper for a drip bag hanging member in the same manner as in Example 1 except that polyvinyl alcohol (PVA117 complete saponification high polymerization degree, manufactured by Kuraray Co., Ltd.) was used as the surface treatment agent, and the coating amount was 0.95 g / m ^2. A substrate was produced. Moreover, the latching member was manufactured similarly to Example 1, and the coloring property, the cross-section water absorption, and the state of delamination were observed.

Example 3
LBKP 100% different from Example 1 was beaten to prepare a 400 ml Canadian standard freeness pulp slurry. Example 1 with the exception of coating the oxidized starch (Ace A manufactured by Oji Cornstarch Co., Ltd.), which is a surface treatment agent, with a size press machine installed in the paper machine to obtain a coating amount of 0.70 g / m ^2. Similarly, a paper base material for a drip bag hanging member was manufactured. Further, a hanging member was produced in the same manner as in Example 1 except that a high-density polyethylene resin (Novatec HD HF560, melting point 134 ° C., manufactured by Nippon Polyethylene Co., Ltd.), which is a water-resistant substrate, was used. In addition, the state of delamination was observed.

Example 4
Wet paper strength agent: Melamine resin (8% AC Sumirez resin manufactured by Sumitomo Chemtex Co., Ltd.) 0.2% pulp, surface treatment agent, polyacrylamide (Arakawa Chemical Industries, Ltd. Polymer Set-512, molecular weight) A paper base material for a drip bag hooking member was produced in the same manner as in Example 2 except that a coating amount of 0.95 g / m ² was applied with a calendar. Moreover, the latching member was manufactured similarly to Example 1, and the coloring property, the cross-section water absorption, and the state of delamination were observed.

Example 5
Wet paper strength agent was melamine resin (8% AC Sumirez resin manufactured by Sumitomo Chemtex Co., Ltd.) 0.2% pulp, and cationized starch (Ace K-250 manufactured by Oji Cornstarch Co., Ltd.) as a surface treatment agent. A paper base for a drip bag hooking member was produced in the same manner as in Example 3 except that the coating amount was 0.95 g / m ² . In addition, a hook member was produced in the same manner as in Example 1 except that polypropylene resin (Novatec PP FL30H melting point 166 ° C. manufactured by Nippon Polyethylene Co., Ltd.) was used, and the colorability, cross-section water absorption and delamination state were observed. did.

Example 6
As a surface treatment agent, for drip bag hanging members in the same manner as in Example 3, except that cationized starch (Ace K-250 manufactured by Oji Cornstarch Co., Ltd.) was applied at a coating amount of 0.20 g / m ² . A paper substrate was prepared. Moreover, the latching member was manufactured similarly to Example 1, and the coloring property, the cross-section water absorption, and the state of delamination were observed.

Example 7
A drip bag hanging member paper base and a hanging member were produced in the same manner as in Example 1 except that polyethylene terephthalate resin (Dianite FX-0012 melting point 260 ° C. manufactured by Mitsubishi Rayon Co., Ltd.) was used. The cross section water absorption and the state of delamination were observed.

Comparative Example 1
A paper base for a drip bag hooking member was produced in the same manner as in Example 1 except that the surface treatment agent was not applied. Moreover, the latching member was manufactured similarly to Example 1, and the coloring property, the cross-section water absorption, and the state of delamination were observed.

Comparative Example 2
A paper base for a drip bag hooking member was produced in the same manner as in Example 2 except that the wet paper strength enhancer was not added. Moreover, the latching member was manufactured similarly to Example 1, and the coloring property, the cross-section water absorption, and the state of delamination were observed.

Table 1 shows the results of the coating amount, colorability, cross-sectional water absorption, and delamination state of the surface treatment agents of the examples and comparative examples.

The outer surface of the two opposing surfaces of the respective engaging member manufactured in polypropylene having a basis weight of 15 g / m ² and 20 g / m ² of water permeable filterable sheet bag body spunbonded nonwoven fabric 2 layer was polymerized as in Example After pasting, 7 g of commercially available regular coffee powder (Blendy) was put into the water-permeable filterable sheet to produce a drip bag. Each drip bag was sealed in the same manner as in the coloring test, and the glass bottles were stored in a constant temperature heater at 60 ° C. for one week, and then the coloring was visually observed. There was no conversion or delamination.

As shown in Table 1, the drip bags of Examples 1 to 7 according to the present invention have little coloration derived from the coffee component, and even when colored, the cross-section water absorption can be kept low. It has the characteristic that peeling does not occur.

Claims (6)

A drip bag comprising a water-permeable filterable sheet bag body having an opening at the upper end and a hooking member disposed on the two outer surfaces facing the bag main body, the hooking member being a wet paper strength enhancer A drip bag comprising a paper base material having a single-layer or multi-layer paperboard structure containing water, and a water-soluble polymer coated on the front and back surfaces of the paper base material. The drip bag according to claim 1, wherein the water-soluble polymer is polyvinyl alcohol. 3. The drip bag according to claim 1, wherein the wet paper strength enhancer is a polyamide polyamine / epichlorohydrin resin. The drip bag according to any one of claims 1 to 3, wherein the hook member has a cross-section water absorption of 1.0 g / 1000 mm ² or less. The drip bag according to any one of claims 1 to 4, wherein a water-resistant base material is provided on at least one surface of the hooking member. 6. The drip bag according to claim 5, wherein the water resistant base material is a polyolefin resin or a saturated polyester resin.