JP2009279781A - Nonwoven fabric product - Google Patents

Abstract

A non-woven fabric product that can be easily recycled is provided.
A non-woven fabric product is a non-woven fabric product having at least a surface portion made of a non-woven fabric, and a printing ink layer is provided on the surface of the non-woven fabric, and high warm water is provided between the printing ink layer and the non-woven fabric. A polymer region 13 having solubility is interposed. Further, the method for recycling the nonwoven fabric product includes a step of recovering the used nonwoven fabric product, and the recovered nonwoven fabric product is immersed in warm water. A dipping process for removing 14 from the polyolefin nonwoven fabric, and a regeneration process for newly regenerating the nonwoven fabric product from the used nonwoven fabric product from which the printing ink layer 14 has been removed.
[Selection] Figure 2

Description

  The present invention relates to a non-woven fabric product for recycling, more specifically, the surface thereof is printed, and the printing ink is easily separated and removed, so that the recycling of the non-woven fabric product is promoted. It relates to an improved non-woven product.

  Recycled paper has been used from the viewpoint of effective use of resources. Recycled paper is generally 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.

  Regarding the removal of paint, Patent Document 1 discloses a highly water-soluble release cleaning agent for use in a cleaning method in which paint attached to coating jigs such as a fixing jig and a mask jig is peeled off. A method of containing molecules is described, and polyvinyl alcohol is mentioned as a water-soluble polymer contained in the peeling cleaning agent. However, this document does not suggest the application of a water-soluble polymer for removing printing ink on the surface of a sheet or film.

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. Has proposed a shopping bag that can be used (Patent Document 2).
JP 2006-206791 A JP 2003-137304 A

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.
Recently, similar demands have arisen not only for shopping bags but also for other non-woven products such as private clothes and suit covers.
That is, there has been a problem of providing a method for recycling a nonwoven fabric product that facilitates the reproduction of a printed nonwoven fabric product to a new unprinted nonwoven fabric product and promotes recycling.

Therefore, as a result of intensive studies, the present inventors have found that in a nonwoven fabric product having a printing ink layer on the surface of the nonwoven fabric, a polymer region having high hot water solubility is interposed between the printing ink layer and the nonwoven fabric. Thus, the present invention has been found that the printing ink layer can be easily separated and removed from the nonwoven fabric simply by immersing the nonwoven fabric product in warm water, and thus the recycling of the printed nonwoven fabric product is expected to be promoted. It came to complete.
The present invention relates to a nonwoven fabric product described in the following (1) to (13) and a method for recycling the nonwoven fabric product.
(1) A non-woven product having at least a surface portion made of non-woven fabric, a printing ink layer is provided on the surface of the non-woven fabric, and a polymer region having high hot water solubility is interposed between the printing ink layer and the non-woven fabric. A non-woven fabric product characterized by being made.
(2) The nonwoven fabric product according to the above (1), which is a bag, clothes or suit cover.
(3) The bag is formed by a pair of a bag lower portion having a bottom portion extending linearly and extending, a left and right bag side portion folded inward and having a gusset, and a folded wide handle portion. The non-woven fabric product according to (2) above, which is a shopping bag comprising an upper portion.
(4) The nonwoven fabric according to any one of (1) to (3), wherein the nonwoven fabric is a polypropylene nonwoven fabric, a polyester nonwoven fabric, or an acrylic resin nonwoven fabric.
(5) The polymer region is made of polyvinyl alcohol, modified polyvinyl alcohol, or a polymer blend of each of them with another polymer, and any one of the above (1) to (4) The nonwoven fabric product according to item.
(6) The polymer region is composed of a polymer having a solubility of less than 10 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. The nonwoven fabric product according to any one of 4).
(7) The nonwoven fabric product according to any one of (1) to (5), wherein the polymer region is formed of polyvinyl alcohol.
(8) The nonwoven fabric product according to (7), wherein the polyvinyl alcohol has a saponification degree of 95 mol% or more.
(9) The polyvinyl alcohol is composed of a polymer having a solubility of less than 10 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. ) Nonwoven products described in the above.
(10) The nonwoven fabric product according to any one of (4) to (9), wherein the polymer region includes a layer of the polymer formed on a surface of the polyolefin nonwoven fabric.
(11) The nonwoven fabric product according to any one of (4) to (9), wherein the polymer region is formed by impregnating the polymer into the polyolefin nonwoven fabric.
(12) a step of recovering the nonwoven fabric product according to any one of (1) to (11) that has been used;
Immersing the recovered nonwoven product in warm water, and at that time, by dissolving the polymer region in warm water, the immersion step of removing the printing ink layer from the nonwoven fabric surface portion,
Then, the recycling method of the nonwoven fabric product characterized by including the reproduction | regeneration process which newly reproduces a nonwoven fabric product from the used nonwoven fabric product from which the printing ink layer was removed as a raw material. (13) The method for recycling a nonwoven fabric product according to (12), wherein in the immersion step, vibration is applied to the nonwoven fabric product immersed in warm water.

According to the present invention, the polymer region having high hot water solubility is interposed between the printing ink layer and the nonwoven fabric even when printing is performed on the nonwoven fabric product. There is provided a non-woven fabric product in which a printing ink layer can be easily removed from the non-woven fabric.
Further, since the nonwoven fabric product of the present invention is composed of a nonwoven fabric that can be easily recycled, the used ink product is removed by collecting the used nonwoven fabric product and removing the printing ink layer from the nonwoven fabric. A new non-woven fabric product can be re-produced using the existing non-woven fabric product. Thus, the present invention provides a recycling method for creating a cycle of recovery, reproduction, and reuse of printed nonwoven products.

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 mask, dust mask, gas mask), 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 or 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 pair of a bag lower portion having a bottom portion extending linearly and extending, a left and right bag side portion folded inward and having a gusset, and a folded wide handle portion A shopping bag having a bag upper portion to be formed may be mentioned.
In addition, in the nonwoven fabric product of the present invention, a polypropylene nonwoven fabric, a polyester nonwoven fabric, or an acrylic resin nonwoven fabric is used as a material in terms of ease of recycling, strength, moldability, and the like. Among these, a polypropylene nonwoven fabric that can be easily recycled is a preferable material.
In addition, when the nonwoven fabric product of the present invention is a shopping bag, the nonwoven fabric used for the shopping bag is lightweight, and it is easy to fold compactly and to re-deploy after folding and return to the original shape. The shopping bag is also very suitable for carrying. Further, since the shopping bags are preferably made of the same nonwoven fabric as a whole, there is no need to disassemble and separate them, so they can be sent to the recycling process as they are, and therefore the shopping bags can be recycled very easily.
In addition, the nonwoven fabric product of the present invention is a nonwoven fabric having at least a surface portion, a printing ink layer provided on the surface of the nonwoven fabric, and a high hot water solubility between the printing ink layer and the nonwoven fabric. It is formed by interposing a molecular region.

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 is composed of a polymer having high hot water solubility, and is composed of, for example, polyvinyl alcohol, modified polyvinyl alcohol, or a polymer blend of each of them with another polymer. Examples of the modified polyvinyl alcohol include various derivatives of polyvinyl alcohol such as cation-modified polyvinyl alcohol, anion-modified polyvinyl alcohol, and silanol-modified polyvinyl alcohol. Other polymers mixed with polyvinyl alcohol or modified polyvinyl alcohol in polymer blends include polyvinyl acetal, cellulose polymers [methyl cellulose (MC), ethyl cellulose (EC), hydroxyethyl cellulose (HEC), carboxymethyl cellulose (CMC). Etc.], chitins, chitosans, starch; polymers having an ether bond, polyethylene oxide (PEO), polypropylene oxide (PPO), polyethylene glycol (PEG), polyvinyl ether (PVE); polymers having an amide group or an amide bond Polyacrylamide (PAAM), polyvinylpyrrolidone (PVP), and polyacrylate and maleate having a carboxyl group as a dissociative group Resins, alginic acid salts, water-soluble polymers such as gelatins. When polyvinyl alcohol or modified polyvinyl alcohol is used as the polymer blend, the amount of polyvinyl alcohol or modified polyvinyl alcohol in the total mass of the polymer blend is preferably 90% by mass or more, and more preferably 95% by mass or more.
The polymer region is preferably composed of polyvinyl alcohol alone. The polymer region such as polyvinyl alcohol used in the present invention is soluble in low-temperature water from the viewpoint that the shopping bag of the present invention is not changed by dissolution and separation of the printing ink layer even when wet in the rain. On the other hand, when polyvinyl alcohol or the like is contacted (immersed) in warm water of 60 ° C. or more so that the polymer region such as polyvinyl alcohol is easily separated from the surface of the nonwoven fabric, it is easily dissolved. It is required to have. Accordingly, polyvinyl alcohol or the like that satisfies these requirements preferably has a saponification degree of 95 mol% or more, more preferably 98 mol% or more. The solubility of polyvinyl alcohol or the like is preferably less than 10 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.
In addition, the polymer region is formed, for example, by laminating a high temperature water-soluble polymer in the form of a film, for example, on the surface of the nonwoven fabric by heat fusion, so that the polymer layer is formed on the surface of the nonwoven fabric. Is done. Alternatively, the polymer region is formed by impregnating the polymer into the nonwoven fabric, for example, by applying or spraying the polymer onto the surface of the nonwoven fabric. 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.
The non-woven fabric product is printed on the surface of the non-woven fabric product depending on its intended use. When the nonwoven fabric product of the present invention is a shopping bag, a logo mark or the like unique to each retail store 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 any of letterpress printing, gravure printing, offset printing, silk screen printing, transfer printing, and the like can be adopted. 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, the printing may be performed at any stage in the manufacturing process of the shopping bag, but when the shopping bag is formed from a non-woven fabric, it is not in the middle of molding but before being formed into the shopping bag. It is preferable to carry out with respect to the non-woven fabric or the non-woven fabric after being formed into a shopping bag.
In the nonwoven fabric product of the present invention, by interposing a polymer region having high warm water solubility between the nonwoven fabric and the printing ink layer, the polymer region is immersed in warm water at a certain temperature or higher. Is dissolved 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 fabric product soaked in warm water, the printing ink layer is further 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.
Furthermore, the recycling method of the nonwoven fabric product of the present invention includes a recovery step of collecting the nonwoven fabric product, an immersion step of removing the printing ink layer from the nonwoven fabric, and a regeneration step of newly regenerating the nonwoven fabric product. In the recovery step, the nonwoven fabric product of the present invention is used multiple times and then recovered as a used nonwoven fabric product. In the dipping process, the printing ink layer is removed from the nonwoven fabric by the method described above. Also, in the regeneration process, a new nonwoven fabric product is newly produced using the used nonwoven fabric product from which the printing ink layer has been removed as a raw material.

Here, the method of forming the shopping bag itself will be described. For example, a long and thin rectangular nonwoven fabric is prepared, folded along a fold that bisects the rectangle in a direction perpendicular to the long side, and the nonwoven fabric including the fold. A part of the cut out part to form an ear part, a handle part and a sealing piece, and then the non-woven fabric was heat-sealed along the long side of the rectangle to create a bag side part and sealed Fold the side of the bag inward, sew a sewing machine with the same material thread as the bag body along the short side facing the handle and the sealing piece, or heat seal to create the bottom of the bag, and The shopping bag of the present invention is formed by folding back.
For example, as another method, an elongated rectangular nonwoven fabric is prepared, folded along a fold that bisects the rectangle in a direction perpendicular to the long side, and both ends of the nonwoven fabric facing the fold are overlapped. Heat seal, further cut off a part of the nonwoven fabric including the sealed edges to form ears, handles and sealing pieces, and then heat seal the nonwoven fabric along the long side of the rectangle The bag side portion is made, the sealed bag side portion is folded inward, and the obtained non-woven fabric is turned over, and the sewing machine is threaded with the same material material as the bag body along the side facing the handle and the sealing piece. A shopping bag is formed by sewing or heat sealing to create the bottom of the bag.
Shopping bags can also be formed by different methods other than those described above.

Further, the shopping bag according to a preferred embodiment of the present invention is such that the left and right bag side portions are each formed by heat-sealing two side portions at a joint extending in the longitudinal direction, and further the upper end of the heat-sealed portion. In addition, an ear portion may be provided that extends upward from the upper edge of the bag side portion. A conventional shopping bag is filled with a large bulky product or a large number of products, and the shopping bag expands. As a result, a force is applied to the shopping bag in the width direction, and the force is applied to the bag side of the shopping bag. Concentrate on the top of the joints. Since the bag side portion of the shopping bag is sewn together with a thread, when a force is applied to expand in the width direction, the bag tears from the seam where the force is concentrated, that is, the seam portion. It causes problems such as tearing. In contrast, when the shopping bag is provided with an ear portion extending upward from the upper edge of the bag side portion, when a force is applied to expand in the width direction, the stress is connected to the bag side portion. The stress can be distributed over a wide area on the upper edge of the bag side portion without being concentrated on the upper end of the eye. The ear portion is formed by cutting a part of the nonwoven fabric, that is, provided integrally with the shopping bag. Further, the upper edge of the ear is formed into a curved convex curve, and the portion from the side edge of the ear to the upper edge of the bag side is formed into a curved concave curve. The stress applied to the side portion can be further relaxed by exerting the stress on the upper edge portion over a wide area.
Moreover, the shopping bag of another preferable aspect of the present invention has a thickness of 1.1 times or more as compared with the thickness of the other part of the shopping bag, with the whole upper part of the bag or at least a part including the handle part. In doing so, it can further provide sufficient tensile and tear strength to withstand the weight of the product. In order to give a sufficiently high strength, the entire upper portion of the shopping bag or at least a portion including the handle portion of the shopping bag is 1.8 times to 3 times the thickness of the other portion of the shopping bag. It is preferable to have a thickness of 0 times. Moreover, when providing the part which becomes thick in the said shopping bag, this thick part does not become thick by overlapping several layers, such as making a nonwoven fabric into two layers, but consists of a single layer. Thus, a significant improvement in strength is seen compared to the two-layer construction. Furthermore, it is preferable that the length of the thick portion in the length direction of the shopping bag is 1/5 to 1/3 of the total length of the bag.
Hereinafter, although an example is given and the present invention is explained in full detail, the present invention is not limited to these examples at all.

[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 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. .

The shopping bag 1 of the present embodiment is formed by sealing a polypropylene nonwoven fabric 2 into a bag shape by heat sealing. The shopping bag 1 is manufactured, for example, as illustrated in FIGS. In FIGS. 3A to 3F, the thick portion 3 is not shown. In the method illustrated in FIG. 3, first, an elongated rectangular nonwoven fabric 2 in which the central portion in the long side direction becomes a thick portion 3 as compared with both end portions is prepared, and the rectangle is bisected in the direction orthogonal to the long side. Fold along the crease (see FIG. 3B). Then, a part including the folds of the folded nonwoven fabric 2 (a portion indicated by hatching in FIG. 3B) is cut out to form the ear part 4, the handle part 5, and the sealing piece 6. Next, the non-woven fabric 2 is heat-sealed along the side that was the long side of the rectangle (7 in the figure indicates a heat-sealed portion) to form the side portion of the shopping bag 1 (see FIG. 3C). . And in order to comprise the handle part 5 from the double nonwoven fabric 2, and in order to provide a gusset in the completed nonwoven fabric shopping bag 1, both sides of the heat-sealed nonwoven fabric 2 are turned inside (for example, FIG. 3 (c)). The non-woven fabric 2 is heat-sealed along the side facing the handle portion 5 and the sealing piece 6 (in the figure, 7 indicates a heat-sealing portion). Mold. Next, the shopping bag 1 is turned upside down, the polyvinyl alcohol film 13 is superimposed on the surface of the nonwoven fabric 2 which is the outer surface of the shopping bag 1, and the nonwoven fabric 2 and the polyvinyl alcohol film 13 are bonded together by heat welding. Furthermore, the printing ink layer 14 is formed by carrying out silk screen printing from it, and the shopping bag 1 of this invention can be manufactured (refer FIG. 2). This polyvinyl alcohol film is made of 100 g of water at 20 ° C.
Only about 2 g dissolves in the water, but about 80 g readily dissolves in warm water at 60 ° C.

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 part 4 is curved, and from the side edge of the ear part 4 to the bag side part. The part to 11 upper edge 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 9 having a bottom part 8 that is closed and extends linearly, and left and right bag side parts 11 that are folded inward and have a gusset 10. The bag upper part 12 which forms the wide handle part 5 in a pair is provided. The thick portion 3 of the shopping bag 1 including the handle portion 5 of the bag upper portion 12 is made of a single layer thick nonwoven fabric having a thickness 2.0 times that of the other portions of the shopping bag 1. Further, the length of the thick portion 3 in the length direction of the shopping bag 1 is 1/3 of the total length of the bag.
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 comparison with a conventional non-woven shopping bag without an ear, 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 heavy goods or bulky goods, it can be used repeatedly usually 10 times or more. it can. 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 14 could be separated from the surface of the shopping bag 1. The shopping bag from which the printing ink layer 14 was separated was taken out of the hot water tank, and the separated printing ink had a specific gravity greater than that of water, and thus 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 the printing ink layer 14 by interposing the polyvinyl alcohol 13 as a polymer region between the polyolefin nonwoven fabric 2 and the printing ink layer 14. 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]
FIG. 5A is a front view showing a surgical gown according to one embodiment of the present invention, and FIG.
The surgical gown 15 of this embodiment is made of a polypropylene nonwoven fabric 2 as shown in FIGS. 5 (a) and 5 (b), and is composed of a front body 16, a back body 17 and a sleeve 18, and a pocket on the chest part of the front body. 19 is stitched. Although the present embodiment shows a short sleeve, it may be a three-quarter sleeve or a long sleeve.
Next, the material cutting and sewing method will be described. The cloth made of the polypropylene nonwoven fabric 2 was cut along the pattern of the front body 16, the back body 17 and the sleeve 18. After the fabric is cut in this way, the pocket 19 is first sewn to the front body 16, and then the front body 16 and the back body 17 are connected to the shoulder suture lines 20 and 20 on both sides and the lower suture lines 21 and 21 on both sides. Sutured along. The thread used for sewing was made of the same polypropylene as the material for the fabric. The suturing procedure may be performed by changing the above order. Then, an appropriate collar fabric 22 was sewn around the neck. The polyvinyl alcohol film 13 is superposed on the surface of the nonwoven fabric 2 which is the outer surface of the surgical clothing 15 made in this way, and the nonwoven fabric 2 and the polyvinyl alcohol film 13 are bonded together by heat welding. Furthermore, the printing ink layer 14 is formed by carrying out silk screen printing from the top, and the surgical clothes 15 of this invention can be manufactured (refer FIG. 6). The polyvinyl alcohol film used here is the same as in Example 1.
Moreover, when the surgical gown 15 made in this manner is placed in a hot water tank maintained at 60 ° C. and immersed for about 3 minutes while applying ultrasonic vibration, the printing ink layer 14 is separated from the surface of the surgical gown 15. We were able to. The shopping bag from which the printing ink layer 14 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.
As described above, even if the surgical clothing 15 is printed on the surface of the polyolefin nonwoven fabric 2, the printing ink layer 14 is formed by interposing the polyvinyl alcohol 13 as a polymer region between the polyolefin nonwoven fabric 2 and the printing ink layer 14. Could be easily separated.
Furthermore, a new surgical gown was able to be reproduced by regenerating the non-woven fabric from the surgical gown 15 from which the printing ink layer had been removed, and forming the surgical gown.
Therefore, the surgical gown 15 could be recycled by a recycling method as shown in FIG.

  The use of the nonwoven product of the present invention consists of recovering the old nonwoven product and recycling it into a new nonwoven product for reuse. Establishing such a circulation system, no waste of resources, and no incineration disposal, so no carbon dioxide is generated. Therefore, the recycling use of the nonwoven fabric product of the present invention is effective for environmental conservation and resource saving. Very preferable from the viewpoint.

FIG. 1 is a perspective view illustrating a shopping bag according to an 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. FIGS. 3A to 3F are schematic views illustrating the manufacturing process of the shopping bag according to the embodiment of the present invention. FIG. 4 is a view showing a shopping bag recycling method of the present invention. FIG. 5 (a) is a front view showing a surgical gown according to one embodiment of the present invention, and (b) is a rear view. FIG. 6 is an enlarged view of the X-X ′ cross section including the printed layer of the surgical gown of FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shopping bag 2 Nonwoven fabric 3 Thick part 4 Ear part 5 Handle part 6 Sealing piece 7 Heat seal part 8 Bottom part 9 Bag lower part 10 Machi 11 Bag side part 12 Bag upper part 13 Polyvinyl alcohol 14 Printing ink layer 15 Surgical clothes 16 Front body 17 Back body 18 Sleeve 19 Pocket 20 Shoulder suture 21 Both side lower suture

Claims (13)

A non-woven fabric product having at least a surface portion made of non-woven fabric, wherein a printing ink layer is provided on the surface of the non-woven fabric, and a polymer region having high hot water solubility is interposed between the printing ink layer and the non-woven fabric. Nonwoven products characterized by that. The non-woven fabric product according to claim 1, which is a bag, clothes or a suit cover. The bag includes a bag lower portion having a bottom portion extending in a linear shape, left and right bag side portions folded inward and having gussets, and a bag upper portion forming a pair of folded wide handle portions. The non-woven fabric product according to claim 2, which is a shopping bag provided. The said nonwoven fabric is a nonwoven fabric product as described in any one of Claims 1 thru | or 3 which is a polypropylene nonwoven fabric, a polyester nonwoven fabric, or an acrylic resin nonwoven fabric. The said high molecular area | region consists of a polymer blend of polyvinyl alcohol, modified polyvinyl alcohol, or each and other polymer | macromolecule, As described in any one of Claims 1 thru | or 4 characterized by the above-mentioned. Nonwoven products. The polymer region is made of a polymer having a solubility of less than 10 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. The nonwoven fabric product according to any one of the above. The nonwoven fabric product according to any one of claims 1 to 5, wherein the polymer region is formed of polyvinyl alcohol. The nonwoven product according to claim 7, wherein the polyvinyl alcohol has a saponification degree of 95 mol% or more. 9. The polymer according to claim 7, wherein the polyvinyl alcohol is composed of a polymer having a solubility of less than 10 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. 9. Nonwoven products. The nonwoven fabric product according to any one of claims 4 to 9, wherein the polymer region has a layer of the polymer formed on the surface of the polyolefin nonwoven fabric. The nonwoven fabric product according to any one of claims 4 to 9, wherein the polymer region is formed by impregnating the polymer into the polyolefin nonwoven fabric. A step of recovering the nonwoven fabric product according to any one of claims 1 to 11;
Immersing the recovered nonwoven product in warm water, and at that time, by dissolving the polymer region in warm water, the immersion step of removing the printing ink layer from the nonwoven fabric surface portion,
Then, the recycling method of a nonwoven fabric product characterized by including the reproduction | regeneration process which reproduces a nonwoven fabric product newly from the used nonwoven fabric product from which the printing ink layer was removed as a raw material. The method for recycling a nonwoven fabric product according to claim 12, wherein in the dipping step, vibration is applied to the nonwoven fabric product soaked in warm water.

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