JP2010119459A - Shopping bag made of nonwoven fabric, and product made of the similar material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shopping bag made of a nonwoven fabric, and a product made of the similar material. <P>SOLUTION: At least the surface part of the shopping bag 1 is made of a polyolefin nonwoven fabric 2. A printed ink layer 13 is disposed on the surface of the nonwoven fabric, and a high-molecular area highly dissolvable in hot water is interposed between the printed ink layer and the nonwoven fabric. The method of recycling the shopping bag made of the nonwoven fabric includes: a step for collecting the used shopping bag; a step for immersion for immersing the collected shopping bag in hot water or alkaline water and removing the printed ink layer with the nonwoven fabric of the shopping bag as the high-molecular area of the shopping bag is dissolved in the hot water or alkaline water at the time; and next, a step for reproducing a new nonwoven fabric shopping bag with the used shopping bag from which the printed ink layer is removed as the raw material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to non-woven products, particularly non-woven shopping bags. More particularly, the present invention relates to a non-woven shopping bag that is easy to recycle, is not easily damaged when a heavy load is stored, is lightweight, compact, and suitable for carrying. And this invention relates not only to a shopping bag but to nonwoven fabric products, such as clothes, a packaging material, or a bag.

  Recycled paper has been used from the viewpoint of effective use of resources. In general, recycled paper is manufactured from deinked pulp from which used ink is removed from waste paper such as newspapers and magazines, and paper is made using this deinked pulp alone or a mixture of deinked pulp with other pulp. It is manufactured. The deinking process is indispensable for the production of recycled paper, which is more expensive than paper made only from virgin pulp. However, the recycling of paper has been achieved through the establishment of deinking technology. Effective use of resources is promoted by utilizing paper. However, the technology for removing the printing ink of a product printed on the surface of a synthetic resin sheet or film is not yet well established.

On the other hand, at present, shopping bags made of resin film that are distributed free of charge are mainly used as a means for customers to take home goods purchased at retail stores such as supermarkets. Among them, a shopping bag manufactured in a bag shape by welding a thin film of low density polyethylene is widely used. However, this type of shopping bag has a low elongation resistance, and when packed with heavy goods, the resin film easily stretches and the shopping bag is torn or deformed. For this reason, the resin film shopping bag Are often used disposable.
Since a plastic film shopping bag is manufactured using petroleum as a raw material, its disposable use leads to a waste of valuable petroleum resources. In addition, since various additives are generally blended in the resin film shopping bag, if it is disposed of by incineration, it becomes a source of harmful gases such as CO ₂ . Carbon dioxide is also called greenhouse gas and is known to cause global warming. Therefore, the usage mode of disposable plastic film shopping bags is very undesirable from the viewpoint of environmental conservation and resource saving.
In view of this problem, the present inventor collected and remanufactured (recycled) a non-woven fabric made mainly of polyester resin by sewing it into a bag with the same polyester resin thread before the present application. Have proposed shopping bags that can be used (Patent Document 1 and Patent Document 2).
Japanese Patent No. 3876409 Japanese Patent No. 3995974

Incidentally, in general, a shopping bag distributed at a retail store is printed with a logo mark or the like unique to each retail store. Since the logo mark functions to identify and promote advertisement for each retail store, the retail store desires to print the logo mark on the above-mentioned non-woven shopping bag for reuse.
However, when a logo mark or the like is printed on a conventional shopping bag made of non-woven fabric, it is necessary to remove the printing ink in order to regenerate the non-woven fabric that is the base material of the shopping bag, but the technology has not yet been developed and proposed. . Therefore, there is a need to provide a new shopping bag made of non-woven fabric that can be easily reproduced from a collected shopping bag to a new shopping bag and promotes recycling even if logo marks are printed. It was.
In addition, the shopping bag that can be used repeatedly is desired to have a strength that makes it difficult to break even when a heavy product or a bulky product is stored. From the viewpoint of strength, there was room for further improvement.
That is, it should facilitate the reproduction of a printed non-woven shopping bag into a new non-printed non-woven product, and provide a non-woven shopping bag having further strength and a method for recycling the non-woven shopping bag. There was a problem.

  As a result of intensive studies to achieve the above object, the present inventor has provided a printing ink layer on the surface of the nonwoven fabric in a nonwoven fabric product, particularly a nonwoven fabric shopping bag having at least a surface portion, and the printing By interposing a polymer region having high hot water solubility between the ink layer and the nonwoven fabric, the printed ink layer can be easily separated and removed from the nonwoven fabric simply by immersing the nonwoven shopping bag in warm water. Thus, the present inventors have found that promotion of recycling of printed non-woven shopping bags is expected, and have completed the present invention.

The present invention relates to a nonwoven fabric product described in the following (1) to (14), a nonwoven fabric shopping bag, and a method for recycling the nonwoven fabric shopping bag.
(1) a bag lower portion having a bottom portion extending in a linear shape and extending;
Left and right bag sides folded inside and having gussets;
A bag upper portion that forms a pair of folded wide handle portions;
A non-woven shopping bag having at least a surface portion made of a polyolefin non-woven fabric,
A non-woven fabric shopping bag comprising a printing ink layer provided on a surface of the non-woven fabric, and a polymer region having high hot water solubility interposed between the printing ink layer and the non-woven fabric.
(2) The polymer region is composed of a polymer having a solubility of less than 20 g with respect to 100 g of water at 20 ° C. and 60 g or more with respect to 100 g of water at 60 ° C. Non-woven shopping bags.
(3) The non-woven fabric shopping bag according to (1) or (2), wherein the polymer region contains a modified polyvinyl alcohol having a cross-linked structure.
(4) The modified polyvinyl alcohol is composed of a polymer having a solubility of less than 20 g with respect to 100 g of water at 20 ° C. and 60 g or more with respect to 100 g of water at 60 ° C. Non-woven shopping bags.
(5) The nonwoven fabric shopping bag according to any one of (1) to (4), wherein the polymer region has a layer of the polymer formed on the surface of the polyolefin nonwoven fabric.
(6) The nonwoven fabric shopping bag according to any one of (1) to (4), wherein the polymer region is formed by impregnating the polymer into the polyolefin nonwoven fabric.
(7) a step of collecting the non-woven fabric shopping bag according to any one of (1) to (6),
The recovered non-woven shopping bag is immersed in warm water or alkaline water, and at that time, the printing ink layer is made from the non-woven fabric of the non-woven shopping bag by dissolving the polymer region in hot water or alkaline water. Removing immersion process;
Then, the recycling method of a nonwoven fabric shopping bag characterized by including the reproduction | regeneration process which reproduces a nonwoven fabric shopping bag newly using the used nonwoven fabric shopping bag from which the printing ink layer was removed as a raw material.
(8) In the said immersion process, a vibration is added to the nonwoven fabric shopping bag immersed in warm water or alkaline water, The recycling method of the nonwoven fabric shopping bag as described in said (7) characterized by the above-mentioned.
(9) The nonwoven fabric shopping bag according to (1), wherein the nonwoven fabric shopping bag is made of a polypropylene nonwoven fabric.
(10) The non-woven fabric shopping bag according to (9), which is sewn with a continuous polypropylene filament.
(11) A non-woven product having at least a surface portion made of non-woven fabric,
A modified polyvinyl having a printing ink layer on the surface of the nonwoven fabric, a polymer region having high hot water solubility interposed between the printing ink layer and the nonwoven fabric, and the polymer region having a crosslinked structure Nonwoven products characterized by containing alcohol.
(12) The modified polyvinyl alcohol is composed of a polymer having a solubility of less than 20 g with respect to 100 g of water at 20 ° C. and 60 g or more with respect to 100 g of water at 60 ° C. Non-woven products.
(13) The nonwoven fabric product according to (11), wherein the nonwoven fabric is a polyolefin nonwoven fabric.
(14) The nonwoven fabric product according to any one of (11) to (13), which is clothes, a packaging material, or a bag.

According to the present invention, even when printing is performed on a non-woven fabric product, particularly a non-woven fabric shopping bag, a high molecular water region having high hot water solubility is interposed between the printing ink layer and the non-woven fabric, thereby A non-woven fabric product, in particular a non-woven fabric shopping bag, can be provided by dissolving the printing ink layer from the non-woven fabric by dissolution in the non-woven fabric.
Furthermore, the non-woven shopping bag of the present invention is very suitable for carrying because it is lightweight and can be folded compactly.

  The nonwoven fabric product of the present invention is a nonwoven fabric having at least a surface portion. Examples of the “nonwoven fabric product” in the present specification include clothes (surgical clothing, experimental clothing, protective clothing), protective products (work gloves, smoke masks, dust masks, gas masks), medical products (caps, masks, sheets). Class, antibacterial mat), storage (storage bag, suit cover, insect cover), packaging material, bag (drying agent bag, shopping bag), household goods (calendar, non-slip sheet, eye mask, book cover, deodorant sheet) , Table tops (table cloths, place mats, coasters), office supplies (envelopes), handicraft supplies, iron mats, OA equipment (floppy (registered trademark) disk liners, CD / DVD cases), and the like. Among them, preferred as the non-woven fabric product of the present invention is a bag (especially a shopping bag), clothes (surgical clothing, experimental clothing, protective clothing) or a suit cover that can be easily collected and recycled.

  In addition, as a specific example of the nonwoven fabric product of the present invention, a bag lower part having a bottom part extending linearly and extending, a right and left bag side part folded inward and having a gusset, and a folded wide handle part And a non-woven shopping bag having at least a surface portion made of a polyolefin non-woven fabric.

  In addition, in the non-woven fabric shopping bag of the present invention, a polyolefin non-woven fabric, for example, a polyethylene non-woven fabric or a polypropylene non-woven fabric is used as a material from the viewpoint of ease of recycling, strength, moldability and the like. Among these, a polypropylene nonwoven fabric that can be easily recycled is preferable.

  In addition, the nonwoven fabric used in the nonwoven fabric shopping bag of the present invention is lightweight, and it is easy to fold compactly and to re-deploy after folding and return to its original shape. Very suitable. Moreover, since the shopping bag is preferably made of the same nonwoven fabric, it is not necessary to disassemble and separate the shopping bag, so that it can be sent to the recycling process as it is, and therefore the shopping bag is very easy to recycle.

Further, the non-woven fabric shopping bag of the present invention has at least a surface portion made of non-woven fabric, provided with a printing ink layer on the surface of the non-woven fabric, and has high hot water solubility between the printing ink layer and the non-woven fabric. It is formed by interposing a polymer region having it.
Furthermore, when the non-woven fabric shopping bag of the present invention is formed from a laminate in which at least the surface portion is made of non-woven fabric, the substrate used as the substrate of the laminate is not particularly limited, and is formed from the laminate. It suffices if the shopping bag has sufficient strength. Examples of the substrate include plastic films such as polyester, polyamide, polyvinyl alcohol, polycarbonate, polyethylene, and polypropylene; papers such as craft paper, fine paper, glassine paper, and cellophane; starch and cellulose sheets; cotton, hemp, polyamide, Examples include woven fabrics such as polyester. There is no restriction | limiting in particular in the lamination | stacking method of the said laminated body, A well-known method can be used.

  Moreover, the said nonwoven fabric used for this invention can use a non-colored thing or the thing dye | stained by dyeing methods, such as beam dyeing, liquid flow dyeing, and dipping, for example, the usual nonwoven fabric dyeing technique. When recycling the shopping bags of the present invention manufactured by dyed non-woven fabrics by recycling, they can be collected separately by color and recycled to recycle newer shopping bags without decoloring the collected bag materials. Can be produced.

  The polymer region in the present invention does not dissolve in low-temperature water from the viewpoint that it is required that the shopping bag of the present invention does not change due to dissolution and separation of the printing ink layer even when wet in the rain. In order for the region to be easily separated from the nonwoven fabric surface, the polymer region is required to have a property of being easily dissolved when contacted (immersed) in high-temperature water at 60 ° C. or higher. It is done. Accordingly, the polymer satisfying these requirements preferably has a solubility of less than 20 g with respect to 100 g of water at 20 ° C. and 60 g or more with respect to 100 g of water at 60 ° C.

（式中、０≦ｌ≦１、０≦ｍ≦１、０≦ｎ≦１、０．８≦ｌ＋ｍ＋ｎ≦１）で表される構造を含むアセトアセチル化ポリビニルアルコール（ｌ、ｍ及びｎは各構造のモル比を表す。この高分子はランダム重合体であってよく、またブロック重合部分を有していてもよい。）を架橋剤と重合することによって得られる変性ポリビニルアルコールが好ましい。市販品としては、例えばゴーセファイマーＺ−２００、Ｚ−４１０（日本合成化学工業（株）製）が好ましい。 Further, in the present invention, polyvinyl alcohol is a polymer having a property such that it is easily dissolved in the above-mentioned specific water resistance, that is, easily dissolved in high-temperature water of 60 ° C. or higher, but difficult to dissolve in low-temperature water such as room temperature water. Preferably used.
The polyvinyl alcohol used in the present invention is not particularly limited as long as it has the water resistance as described above. For example, modified polyvinyl alcohol having various modifying groups such as an alkoxy group, an ester group, and an alkylene ether group may be used. . The saponification degree is preferably 97.5 mol% or more. In particular, modified polyvinyl alcohol having a crosslinked structure obtained by polymerizing polyvinyl alcohol and a crosslinking agent is preferably used. Among them, for example, the following formula

(Wherein, 0 ≦ l ≦ 1, 0 ≦ m ≦ 1, 0 ≦ n ≦ 1, 0.8 ≦ l + m + n ≦ 1) acetoacetylated polyvinyl alcohol (l, m and n are each This represents a molar ratio of the structure.This polymer may be a random polymer and may have a block polymerization portion.) Modified polyvinyl alcohol obtained by polymerizing with a crosslinking agent is preferred. As a commercially available product, for example, Goseifamer Z-200 and Z-410 (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) are preferable.

The crosslinking agent used in the present invention is not particularly limited as long as it is a compound capable of imparting water resistance as described above by crosslinking polyvinyl alcohol. For example, a polyvalent metal compound, a boron compound, an amine compound, hydrazine A compound, a silane compound, a methylol group-containing compound, an aldehyde group-containing compound, an epoxy compound, a thiol compound, an isocyanate compound, or the like can be used. These may be used alone or in combination of two or more. As commercially available products, for example, Glyoxal GX (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), Sumimar M-30W (manufactured by Sumitomo Chemical Co., Ltd.), and Hilink DM (manufactured by Clariant) are preferable. The cross-linking agent is more than 0.1% by mass and less than 2.0% by mass, preferably more than 1.0% by mass and less than 1.5% by mass, and more preferably more than 0.5% with respect to the mass of polyvinyl alcohol. It is added in an amount of 1.0% by mass or less. If the addition amount of the cross-linking agent is less than the lower limit of the above range, the degree of cross-linking is insufficiently lowered, so that the desired water resistance against normal temperature water and high temperature water cannot be obtained, and the addition amount is above the above range. When the amount is limited, particularly more than 2.0% by mass, the degree of crosslinking becomes considerably high, so that the water resistance against normal temperature water becomes high and the water resistance against high temperature water becomes too high, and easily dissolves in high temperature water at 60 ° C. or higher. However, the water resistance required for the polymer region of the present invention, which is difficult to dissolve in low temperature water such as room temperature water, cannot be obtained.

  The acetoacetylated polyvinyl alcohol used in the present invention is preferably one obtained by acetoacetylating polyvinyl alcohol. As the method, polyvinyl alcohol is dispersed in an acetic acid solvent, and diketene is added thereto, polyvinyl alcohol. Is preferably used in advance by dissolving diketene in a solvent such as dimethylformaldehyde or dioxane and adding diketene thereto, or by directly contacting diketene gas or liquid diketene with polyvinyl alcohol.

また、分子内にアセトアセチル基を有するポリビニルアルコールと、架橋剤としてアルデヒド基含有化合物とを反応させた場合、下記のような架橋構造を形成する。

また、分子内にアセトアセチル基を有するポリビニルアルコールと、架橋剤としてメチロール基含有化合物とを反応させた場合、下記のような架橋構造を形成する。

また、分子内にアセトアセチル基を有するポリビニルアルコールと、架橋剤として多価金属化合物とを反応させた場合、下記のような架橋構造を形成する。

In the present invention, when a polyvinyl alcohol having an acetoacetyl group introduced into the side chain is reacted with an amine compound as a crosslinking agent, the following crosslinked structure is formed.

Moreover, when the polyvinyl alcohol which has an acetoacetyl group in a molecule | numerator and the aldehyde group containing compound as a crosslinking agent are made to react, the following crosslinked structures are formed.

Moreover, when the polyvinyl alcohol which has an acetoacetyl group in a molecule | numerator and the methylol group containing compound as a crosslinking agent are made to react, the following crosslinked structures are formed.

Moreover, when the polyvinyl alcohol which has an acetoacetyl group in a molecule | numerator and the polyvalent metal compound as a crosslinking agent are made to react, the following crosslinked structures are formed.

  In addition, the acetoacetylated polyvinyl alcohol having a crosslinked structure as described above according to the present invention has a property of being hardly soluble in acid and easily soluble in strong alkalinity. It can be easily dissolved by using alkaline water.

  Further, the polymer region is formed by, for example, ironing a polymer having high hot water solubility in the form of a film to the surface of the nonwoven fabric by heat-sealing, so that the polymer layer is formed on the surface of the nonwoven fabric. It is formed. Alternatively, the polymer region is formed by impregnating the polymer into the nonwoven fabric by, for example, applying or spraying an aqueous solution of the polymer onto the surface of the nonwoven fabric and drying. When a polymer is laminated on the surface of the nonwoven fabric, a polymer region having a sufficient thickness is formed between the nonwoven fabric and the printing ink layer, so that it can be easily separated when separating the printing ink layer from the nonwoven fabric. can do. On the other hand, when the non-woven fabric is impregnated with a polymer, the adhesion of the polymer to the non-woven fabric is increased, so that the appearance is also beautiful.

In addition, the non-woven fabric shopping bag of the present invention is printed on the surface of the non-woven fabric depending on its intended use, for example, each retail store's unique logo mark or the like is printed. The logo mark that performs the function of identifying each retail store and the function of advertising is printed on the surface of the non-woven fabric through the polymer region formed by the method described above. The printing method is not particularly limited as long as it is a method conventionally used for printing on nonwoven fabrics, and may be any of letterpress printing, gravure printing, offset printing, silk screen printing, transfer printing, and the like. Of these, silk screen printing is preferred because printing is possible regardless of thickness, size, plane, and curved surface. When printing on the shopping bag, a pre-printed film may be ironed to the surface of the shopping bag, the film may be ironed to the nonwoven fabric surface, and printed from there, or a polymer You may print on the nonwoven fabric surface impregnated with the solution.

  In the non-woven fabric shopping bag of the present invention, by interposing a polymer region having high hot water solubility between the non-woven fabric and the printing ink layer, by immersing the non-woven shopping bag in hot water of a certain temperature or more, The polymer region dissolves in warm water, and the printing ink layer can be easily separated from the surface of the nonwoven fabric. At this time, by applying vibration, particularly ultrasonic vibration, to the non-woven shopping bag immersed in warm water, the printing ink layer is more easily peeled off from the non-woven fabric. Further, the printing ink constituting the separated printing ink layer is generally insoluble in water and does not dissolve even in warm water, so that only the printing ink layer can be easily removed from the warm water. In addition, when separating the printing ink layer from the non-woven fabric product of the present invention, only water is used without using an organic solvent, etc., which has an impact on the health of workers and also on the environment such as soil contamination. Absent.

  The non-woven fabric shopping bag recycling method of the present invention further includes a collection step for collecting the non-woven shopping bag, an immersion step for removing the printing ink layer from the non-woven fabric, and a regeneration step for newly regenerating the non-woven shopping bag. It is a waste. In the collection step, the non-woven fabric shopping bag of the present invention is used a plurality of times and then collected as a used non-woven fabric shopping bag. In the dipping process, the printing ink layer is removed from the nonwoven fabric by the method described above. Further, in the regeneration process, a non-woven fabric shopping bag is newly regenerated from the used non-woven fabric shopping bag from which the printing ink layer has been removed.

The non-woven shopping bag of the present invention is formed by the following method, but can also be formed by a different method other than the following.
In the method for forming a non-woven fabric shopping bag of the present invention, a non-woven fabric sheet having a rectangular shape is prepared, the non-woven fabric sheet is folded so that one short side portion overlaps the other short side portion, and a part of the formed fold portion Are removed to form a handle and a sealing piece. Next, the overlapped left and right long sides are sewn or heat sealed with a thread made of the same material as the bag body to form the bag side. Subsequently, the left and right bag side portions that have been stitched or heat sealed are folded inward by a length that provides a gusset on the bag body, and the lower end of the folded portion and the bottom side portion that overlaps with the sewing machine are sewn or heat sealed with the thread. Thus, left and right bag side portions and a bag lower portion of the bag body are formed. And the nonwoven fabric shopping bag of this invention is obtained by turning the bag body obtained in this way over.

Further, in another method for forming a non-woven fabric shopping bag of the present invention, in the second embodiment, a part of the non-woven fabric sheet is cut out to form a handle portion as in the above-described embodiment. It differs from the above-described aspect in that it is formed not on the crease part but on the short side part that is stitched or heat-sealed. That is, a non-woven sheet having a rectangular shape is prepared, the non-woven sheet is folded so that one short side overlaps the other short side, and the edge of the overlapped short side is made of the same material as the bag body. The sewing machine is sewn or heat-sealed, and the handle and the sealing piece are formed by cutting away a part of the short side that is sewn or heat-sealed. Next, the overlapped left and right long sides are sewn or heat sealed with a thread made of the same material as the bag body to form the bag side. Subsequently, the left and right bag side portions that have been stitched or heat sealed are folded inward by a length that provides a gusset on the bag body, and the lower end of the folded portion and the bottom side portion that overlaps with the sewing machine are sewn or heat sealed with the thread. Thus, left and right bag side portions and a bag lower portion of the bag body are formed. And the nonwoven fabric shopping bag of this invention is obtained by turning the bag body obtained in this way over.
In the non-woven shopping bag of the present invention, the bag and the thread are all made of the same material, so that the troublesome work of separating them at the time of recycling can be omitted.

Example 1
Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view illustrating a non-woven shopping bag according to an embodiment of the present invention, and FIGS. 3A to 3F are schematic views illustrating an example of a molding process of the shopping bag of FIG. It is.

In the shopping bag 1 of this example, the polypropylene nonwoven fabric sheet 2 was sealed in a bag shape by heat sealing. The shopping bag 1 was manufactured as shown in FIGS. 3 (a) to 3 (f), for example. In the method illustrated in FIG. 3, an elongated rectangular polypropylene nonwoven fabric sheet 2 is prepared, and the nonwoven fabric sheet is folded so that one short side overlaps the other short side (see FIG. 3B). And the part (folded part in FIG.3 (b)) including the crease | fold of the folded nonwoven fabric sheet 2 was excised, and the ear | edge part 3, the handle part 4, and the sealing piece 5 were formed. Next, the nonwoven fabric sheet 2 is heat-sealed along the long side of the rectangle (in FIG. 3 (c), 6 indicates a heat-sealed portion) to form the bag side portion 10 of the shopping bag 1 ( (Refer FIG.3 (c)). And in order to comprise the handle part 4 from the double nonwoven fabric sheet 2, and in order to provide the town 9 in the completed nonwoven fabric shopping bag 1, both sides of the heat-sealed nonwoven fabric sheet 2 are turned inside (for example, FIG. 3). (Along line X and line X ′ in (c)), heat-sealing the nonwoven fabric 2 along the side facing the handle portion 4 and the sealing piece 5 (in FIG. 3D, 6 is a heat-sealing portion) A shopping bag 1 was formed. Next, the shopping bag 1 was turned upside down, the modified polyvinyl alcohol film 12 was superposed on the surface of the nonwoven fabric sheet 2 serving as the outer surface of the shopping bag 1, and the nonwoven fabric sheet 2 and the modified polyvinyl alcohol film 12 were bonded together by heat welding. Furthermore, the printing ink layer 13 was formed by carrying out silk screen printing from the top, and the shopping bag 1 of this invention was able to be manufactured (refer FIG. 2). The modified polyvinyl alcohol film 12 dissolves only about 2 g in 100 g of water at 20 ° C., but easily dissolves about 80 g in hot water at 60 ° C. Further, the modified polyvinyl alcohol film 12 is prepared such that Hilink DM (manufactured by Clariant) as a cross-linking agent is 1.0% by mass with respect to Gohsephimer Z-200 (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.). , And formed into a film having a thickness of about 40 μm.

As shown in FIG. 1, the shopping bag 1 of the present invention thus formed is formed in a convex curve shape in which the upper edge of the ear 3 is curved, and the side of the bag from the side edge of the ear 3. The part to the upper edge of 10 is formed in the concave curve shape which curved. Further, as shown in FIG. 1, the shopping bag 1 is folded into a bag lower part 8 having a bottom part 7 that extends in a linear shape, and left and right bag side parts 10 that are folded inward and have gussets 9. The bag upper part 11 which forms the wide handle part 4 in a pair is provided.
Therefore, the shopping bag 1 does not tear or tear from the joints on the side of the bag even when many products or heavy products are put, and in the bag compared to a conventional non-woven shopping bag without ears. The load limit of the contents to be packed and the allowable volume can be remarkably improved. Therefore, even if the shopping bag 1 of the present invention is repeatedly used with a heavy product or a bulky product, it can usually be used repeatedly 5 times or more. did it. The non-woven fabric 2 made of polyolefin is lightweight, and can be folded compactly, and can be easily re-deployed after being folded back to its original shape. Therefore, the shopping bag 1 of the present invention is very suitable for carrying. Yes.

Further, when the shopping bag 1 was placed in a hot water tank maintained at 65 ° C. and immersed for about 3 minutes while applying ultrasonic vibration, the printing ink layer 13 could be separated from the surface of the shopping bag 1. The shopping bag from which the printing ink layer 13 was separated was taken out of the hot water tank, and the separated printing ink had a specific gravity greater than that of water, so that it sank to the bottom of the hot water tank. The sinking printing ink was removed from the hot water tank.
Thus, even if printing is performed on the surface of the polyolefin nonwoven fabric 2, the shopping bag 1 has a printing ink layer by interposing the modified polyvinyl alcohol 12 as a polymer region between the polyolefin nonwoven fabric 2 and the printing ink layer 13. 13 could be easily separated.
Furthermore, a new shopping bag could be reproduced by regenerating and forming a non-woven fabric from the shopping bag from which the printing ink layer was removed.
Therefore, the shopping bag 1 could be recycled by a recycling method as shown in FIG.

Example 2
The shopping bag 14 formed by the same procedure as in Example 1 is turned over, and a modified polyvinyl alcohol film 17 having a printing ink layer 16 on the surface of the nonwoven fabric sheet 15 which is the outer surface of the shopping bag 14 by silk screen printing in advance. The nonwoven fabric sheet 15 and the modified polyvinyl alcohol film 17 were bonded together by heat welding with an iron to produce a shopping bag 14 of the present invention (see FIG. 5). The modified polyvinyl alcohol film is the same as that used in Example 1.
Further, the printing ink layer 16 was separated from the shopping bag 14 by the same method as in Example 1. As a result, even if a modified polyvinyl alcohol film having a surface printed in advance is used, the modified polyvinyl alcohol is interposed as a polymer region between the nonwoven fabric sheet 15 and the printing ink layer 16 as in the shopping bag 1 of Example 1. By doing so, the printing ink layer 16 could be easily separated.
Furthermore, a new shopping bag can be reproduced by a recycling method as shown in FIG. 4 by regenerating and forming a non-woven fabric from the shopping bag from which the printing ink layer has been removed.

Example 3
The shopping bag 18 molded by the same procedure as in Example 1 is turned over, and the surface of the nonwoven fabric sheet 19 that is the outer surface of the shopping bag 18 is coated with a modified polyvinyl alcohol aqueous solution 20 to evaporate the water, and then the surface The printing ink layer 21 was formed by printing by silk screen printing, and the shopping bag 18 of this invention was manufactured (refer FIG. 6). Moreover, the modified polyvinyl alcohol aqueous solution 20 is mixed with Hylink DM (manufactured by Clariant) as a cross-linking agent so as to have a mass of 1.0 with respect to Gohsephimer Z-200 (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.). Prepared.
Next, the printing ink layer 21 was separated from the shopping bag 18 by the same method as in Example 1. As a result, in the shopping bag 18 obtained as described above, the modified polyvinyl alcohol 20 is interposed as a polymer region between the nonwoven fabric sheet 19 and the printing ink layer 21 as in the shopping bag 1 of Example 1. Thus, the printing ink layer 21 could be easily separated.
Furthermore, a new shopping bag can be reproduced by a recycling method as shown in FIG. 4 by regenerating and forming a non-woven fabric from the shopping bag from which the printing ink layer has been removed.

1 is a perspective view illustrating a shopping bag according to a first embodiment of the present invention. FIG. 2 is an enlarged view of the A-A ′ cross section including the printed layer of the shopping bag of FIG. 1. 3A to 3F are schematic views illustrating the manufacturing process of the shopping bag of the first embodiment. FIG. 4 is a view showing a shopping bag recycling method of the present invention. FIG. 5 is a schematic diagram illustrating the manufacturing process of the shopping bag of the second embodiment. FIG. 6 is a schematic diagram illustrating the manufacturing process of the shopping bag of the third embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shopping bag 2 Polypropylene nonwoven fabric sheet 3 Ear part 4 Handle part 5 Sealing piece 6 Heat seal part 7 Bottom part 8 Bag lower part 9 Machi 10 Bag side part 11 Bag upper part 12 Denatured polyvinyl alcohol film 13 Printed ink layer 14 Shopping bag 15 Nonwoven cloth Sheet 16 Printing ink layer 17 Modified polyvinyl alcohol film 18 Shopping bag 19 Non-woven sheet 20 Modified polyvinyl alcohol aqueous solution 21 Printing ink layer

Claims (14)

A bag lower portion having a bottom portion extending linearly and extending;
Left and right bag sides folded inside and having gussets;
A bag upper portion that forms a pair of folded wide handle portions;
A non-woven shopping bag having at least a surface portion made of a polyolefin non-woven fabric,
A non-woven fabric shopping bag comprising a printing ink layer provided on a surface of the non-woven fabric, and a polymer region having high hot water solubility interposed between the printing ink layer and the non-woven fabric. The non-woven fabric shopping product according to claim 1, wherein the polymer region is made of a polymer having a solubility of less than 20g with respect to 100g of water at 20 ° C and 60g or more with respect to 100g of water at 60 ° C. bag. The non-woven fabric shopping bag according to claim 1 or 2, wherein the polymer region contains a modified polyvinyl alcohol having a cross-linked structure. The non-woven fabric shopping product according to claim 3, wherein the modified polyvinyl alcohol is composed of a polymer having a solubility of less than 20 g per 100 g of water at 20 ° C and 60 g or more per 100 g of water at 60 ° C. bag. The nonwoven fabric shopping bag according to any one of claims 1 to 4, wherein the polymer region is formed by forming a layer of the polymer on the surface of the polyolefin nonwoven fabric. The nonwoven fabric shopping bag according to any one of claims 1 to 4, wherein the polymer region is formed by impregnating the polymer into the polyolefin nonwoven fabric. Collecting the non-woven fabric shopping bag according to any one of claims 1 to 6;
The recovered non-woven shopping bag is immersed in warm water or alkaline water, and at that time, the printing ink layer is made from the non-woven fabric of the non-woven shopping bag by dissolving the polymer region in hot water or alkaline water. Removing immersion process;
Then, the recycling method of a nonwoven fabric shopping bag characterized by including the reproduction | regeneration process which reproduces a nonwoven fabric shopping bag newly using the used nonwoven fabric shopping bag from which the printing ink layer was removed as a raw material. The method for recycling a non-woven shopping bag according to claim 7, wherein vibration is applied to the non-woven shopping bag immersed in warm water or alkaline water in the dipping step. The non-woven fabric shopping bag according to claim 1, wherein the non-woven shopping bag is made of a polypropylene non-woven fabric. The non-woven shopping bag according to claim 9, which is sewn with a continuous polypropylene filament. A non-woven product having at least a surface portion made of non-woven fabric,
A modified polyvinyl having a printing ink layer on the surface of the nonwoven fabric, a polymer region having high hot water solubility interposed between the printing ink layer and the nonwoven fabric, and the polymer region having a crosslinked structure Nonwoven products characterized by containing alcohol. The modified polyvinyl alcohol is less than 20 g and 100 ° C. with respect to 100 g of water at 20 ° C.
The nonwoven fabric product according to claim 11, comprising a polymer having a solubility of 60 g or more with respect to 100 g of water. The nonwoven fabric product according to claim 11, wherein the nonwoven fabric is a polyolefin nonwoven fabric. The nonwoven fabric product according to any one of claims 11 to 13, which is a garment, a packaging material, or a bag.

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