JP2005313968A - Old newspaper collection bag, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biodegradable plastic film-made old newspaper collection bag which has a carrying handle part and a parallelopiped bag body part when it is used and need not be collected or incinerated after it is used, and a method for manufacturing the same. <P>SOLUTION: The biodegradable plastic film-made old newspaper collection bag has a carrying handle part and a parallelopiped bag body part when old newspaper is stored therein, and is heat-sealable. A W-shaped gusset fold is provided on a top edge and a bottom edge of the bag, both side edges of the bag are melt-cut or welded, the gusset fold at the top edge is cut at the center fold, and a film is punched at the center of the top edge to form the handle part. Each pair of outer and inner films of the gusset fold are welded diagonally to the top edge and the bottom edge of the bag from a part in a vicinity of the inner fold of the gusset of the top edge and the bottom edge. The method for manufacturing the old newspaper collection bag comprises (1) a gusset folding step, (2) a cutting step, (3) a punching step, (4) a welding step, and (5) a heat-cutting step while transferring the long tubular film. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a used newspaper recovery bag and a method for manufacturing the same. More specifically, the present invention can be stored in a state of being folded into a rectangle, and is formed with a handbag portion that can withstand a large weight during use, and a rectangular parallelepiped bag portion having a rectangular bottom surface, and biodegraded after use. In addition, the present invention relates to a used newspaper recovered bag made of biodegradable plastic film that does not require collection or incineration, and a method for manufacturing the same.

Collection and reuse of used paper such as newspapers, insert advertisements, magazines, and wrapping papers will save raw pulp resources and preserve forest resources at home and abroad. In addition, by collecting and reusing waste paper, it is possible to reduce the burden on garbage collection and disposal by local governments as solid waste. The use of waste paper is not only meaningful as a substitute for pulp, but also contributes greatly to resource environment problems. For this reason, newspapers, local governments, neighborhood associations, PTAs, etc. are actively collecting used paper such as newspapers from households.
However, since the used paper market is experiencing a volatile fluctuation in the supply and demand balance and the price of used paper continues to stagnate, it is required that the collection bags be inexpensive. On the other hand, when combined with newspapers and insert advertisements, the weight is about 5 kg in half a month, and the collection bag is required to have enough strength to withstand this weight. The recovered used paper is sorted at the used paper collection stage, but this process must be relied on manually, which contributes to the cost increase of the used paper and affects the subsequent mechanical processing and quality of the used paper pulp. large. Furthermore, when sorting used paper, the used paper collection bag in which the used paper is stored becomes a new waste, which requires incineration. If the used paper collection bag is made of biodegradable plastic film, it is embedded in the soil, without incineration or other means, without adversely affecting the environment, and naturally decomposing and disappearing by the action of microorganisms. It becomes possible to make it. However, conventionally, there has been no known method for economically producing a used newspaper recovery bag that is biologically decomposed in a short time and has sufficient strength to store and transport used newspaper.

  The present invention can be stored in a state of being folded into a rectangle, and is formed with a handbag portion that can withstand a large weight during use, and a rectangular parallelepiped bag body portion having a rectangular bottom surface. The purpose of the present invention is to provide a used newspaper recovery bag made of biodegradable plastic film that does not require incineration and a method for producing the same.

As a result of intensive research to solve the above-mentioned problems, the present inventors have used a biodegradable plastic film made of biodegradable plastic film having heat-sealing properties in which a hand-held portion and a rectangular parallelepiped bag portion are formed when the used paper is stored. A collection bag, which has W-shaped gusset folds on the top and bottom edges of the bag, a handbag is formed from the gusset folds on the top edge, and the outer and inner films of the gusset folds Newspaper waste paper collection bags that are welded obliquely from the vicinity of the folded edges of the edges and bottom edges of the gusset to the top edge and bottom edge of the bag can be efficiently manufactured in a series of manufacturing processes, and The present invention has been found to have sufficient strength to accommodate and handle the present invention, and the present invention has been completed based on this finding.
That is, the present invention
(1) A newspaper waste paper collection bag made of biodegradable plastic film with heat-sealability in which a handbag and a rectangular bag-shaped bag body are formed when used paper is stored, and has a W-shape on the top and bottom edges of the bag It has a gusset fold, both side edges of the bag are melted or welded, the upper edge gusset fold is cut at the inner center fold, the film is punched at the center of the upper edge to form a handbag, and the outside of the gusset fold And an inner film for each pair, a newspaper used paper collection bag, wherein the upper edge and the bottom edge of the gusset are folded in the oblique direction from the vicinity of the folded edge of the upper edge and the bottom edge of the bag,
(2) The used newspaper recovered bag according to (1), wherein the biodegradable plastic film has a heat seal strength of 5 N / 10 mm or more,
(3) The used newspaper recovery bag according to (1), wherein the biodegradable plastic film is an aliphatic polyester film,
(4) The used newspaper recovery bag according to (3), wherein the aliphatic polyester film is polybutylene succinate or polybutylene succinate adipate or a polymer film obtained by chain-extending them using a diisocyanate compound,
(5) A step of forming a strip-shaped film having a pair of W-shaped gusset folds on both side edges while transferring a long tube-shaped biodegradable plastic film having heat sealability, (2) A step of cutting the inner center fold of the gusset fold, and (3) a step of punching four films by a punching blade and a punch receiving plate for each width of the bag at the side edge of the inner center fold cut. , (4) Insert a weld receiving plate between the gusset folds on both side edges, press the substantially V-shaped heat welding blades on both side edges of the border line of the adjacent bags, and place the two gusset-folded films side by side A step of welding in a line forming an oblique direction with respect to the edge; and (5) a step of fusing the band-shaped film by pressing a thermal fusing blade for each width of the bag, or (5 ′) a band-shaped film of the bag After pressing the heat welding blade for each width, A method for producing a used newspaper recovery bag, comprising a step of cutting with a cutting blade; and
(6) A process of forming a strip-shaped film having a pair of W-shaped gusset folds on both side edges while transferring a long tube-shaped biodegradable plastic film having heat sealability, (2) (4) Inserting a weld receiving plate between the gusset folds on both side edges, and forming a substantially V-shaped heat welding blade on both side edges of the border line of adjacent bags. A process of welding two pieces of gusset-folded films in a line that forms an oblique direction with respect to the side edges, (5) fusing the band-shaped film by pressing a thermal cutting blade for each width of the bag, or ( 5 ′) a step of pressing the heat welding blade for each width of the bag body to weld the belt-like film and then cutting it with the cutting blade to separate the bag body, and (6) stacking the separated bag bodies, The side edge of the inner crease cut is used as the punching blade. A method for producing used newspaper recovery bags, characterized by having a more punching process,
Is to provide.

  The newspaper used paper collection bag of the present invention has sufficient strength to store and handle used paper, there is no broken bag during transportation, etc., and it is biologically decomposed and disappears after use. No incinerator is required. According to the manufacturing method of the present invention, such a used newspaper recovery bag can be efficiently and economically manufactured through a series of steps.

The waste paper recovery bag of the present invention is a waste paper recovery bag made of biodegradable plastic film having a heat seal property in which a handbag and a rectangular parallelepiped bag body portion are formed when storing used paper, and the upper edge of the bag It has a W-shaped gusset fold at the bottom edge, both side edges of the bag are melted or welded, the upper edge gusset fold is cut at the inner center fold, and a film is punched at the center of the upper edge to form a hand-held portion In this case, the recovered newspaper recovered bags are formed such that the outer and inner films of the gusset folds are welded in the diagonal direction from the vicinity of the upper edge and the bottom edge of the gusset to the upper edge and the bottom edge of the bag.
FIG. 1 is a plan view of an embodiment of the used newspaper recovery bag according to the present invention, an end view of the AA line cutting part and an end view of the BB line cutting part, and FIG. It is a perspective view which shows a state.
When the used newspaper recovery bag shown in FIG. 1 is opened, the uncut gusset fold 1 is opened to form a rectangular bottom surface having a short side length 2a and a long side length b. When one side of a newspaper is folded into four, it becomes a rectangle with a short side length of about 20cm and a long side length of about 27cm. The folded shape of the newspaper after reading is slightly broken, so a, the depth of the bottom edge gusset fold The length is preferably 10.5 to 12 cm, and b is preferably 28 to 32 cm.
It is preferable that the angle α formed by the welding line 2 that is welded obliquely from the vicinity of the inner folding end of the bottom edge gusset fold to the bottom edge of the bag and the bottom edge of the bag is approximately 45 degrees. When the angle α is 45 degrees, as shown in FIG. 2, when the used newspaper collection bag is opened, a substantially right-angled isosceles triangle folded portion is formed at the lower part of the side surface of the rectangular parallelepiped bag. In FIG. 1, c is the depth of the rectangular parallelepiped bag formed when the used newspaper collection bag is opened. Although c can be appropriately selected according to the amount of used newspaper waste, it is usually preferably 30 to 40 cm.

In the method of the present invention, it is preferable that the weld line of the bottom edge side gusset fold is curved in a direction parallel to the bottom edge at the front end portion 3 of the weld line corresponding to both side ends of the used newspaper recovery bag. The welding line curved in the direction parallel to the side edge at the front end is curved horizontally at the front end when the waste paper recovery bag is opened to form a rectangular parallelepiped bag. The stress applied when the used paper is stored and transported can be dispersed in the horizontal direction to prevent the stress from being concentrated on the front end portion of the welding wire, and the newspaper used paper collection bag can be prevented from being damaged at the front end portion of the welding wire.
In FIG. 1, the gusset fold 4 with the inner center fold line cut is formed with a handbag portion 5 when the used waste paper collection bag is opened, and a hand is put into the punched portion 6 to grasp the two handbag portions. , Can transport used newspaper recovery bags. There is no particular limitation on the depth of the gusset fold that forms the handbag, and it can be selected as appropriate according to the weight of the used newspaper, the thickness of the plastic film, the convenience of the used newspaper collection bag, etc. It is preferable that the depth of the gusset fold forming the handbag portion is shallower than the depth of the gusset fold at the bottom edge so that the two handbag portions do not overlap at the opening of the used newspaper collection bag.
In FIG. 1, the angle β formed by the upper edge of the weld line 7 of the upper edge gusset fold is preferably approximately 45 degrees in the vicinity of the upper edge, and is parallel to the upper edge at the tip 8 of the weld line. It is preferable to bend in the direction. The welding line curved in the direction parallel to the upper edge at the front end portion is bent horizontally in the front end portion when the waste paper recovery bag is opened to form a rectangular parallelepiped bag body. Since the stress applied when the container is stored and transported is dispersed in the horizontal direction and stress concentration on the tip of the weld line is prevented, damage to the used newspaper recovery bag at the tip of the weld line can be prevented.

In the present invention, the heat seal strength of the biodegradable plastic film having heat sealability is preferably 5 N / 10 mm or more, more preferably 8 N / 10 mm or more, and 10 N / 10 mm or more. Further preferred. The heat seal strength was obtained by stacking two biodegradable plastic films, heat-sealing at a heat seal width of 2 mm, a temperature of 175 ° C., a pressure of 220 kPa, and a heat seal time of 0.3 seconds to prepare a test piece, JIS Z 1711 It can be measured according to 8.4. If the heat seal strength of the biodegradable plastic film is less than 5 N / 10 mm, the strength as a used newspaper recovery bag when storing and handling used newspaper may be insufficient.
In the present invention, the biodegradable plastic film having heat sealability is preferably an aliphatic polyester film. The aliphatic polyester film is preferably a polybutylene succinate or polybutylene succinate adipate or a polymer film obtained by chain extending them using a diisocyanate compound. Polybutylene succinate or polybutylene succinate adipate or polymers obtained by chain extension of them using a diisocyanate compound can be formed by an inflation method, is flexible, and has been conventionally used as a material for used newspaper recovery bags. Since it has mechanical properties similar to those of low density polyethylene, it can be manufactured by applying the prior art, and can be used by consumers without a sense of resistance.

1st aspect of the manufacturing method of the newspaper used paper collection bag of this invention has a pair of W-shaped gusset folds in a both-sides edge, conveying the plastic film which has a long tube-shaped heat-seal property. A step of forming a belt-like film, (2) a step of cutting the inner central fold of one gusset fold, and (3) a punching blade for each width of the bag body at the side edge of the inner central fold cut. A process of punching four films with a punching receiving plate, (4) Inserting a welding receiving plate between gusset folds on both side edges, and pressing a substantially V-shaped thermal welding blade on both side edges of the border line of adjacent bags , A step of welding two gusset-folded films in a line that forms an oblique direction with respect to the side edge, and (5) a step of fusing the band-shaped film by pressing a thermal cutting blade for each width of the bag, Or (5 ') belt-shaped film with a strip-shaped film And a step of cutting with a cutting blade after welding by pressing a heat welding blade.
FIG. 3 is a process flow diagram of one embodiment of the method of the present invention. While continuously transporting the long tube-shaped biodegradable plastic film 9 having heat sealability, a band-shaped film 11 having a pair of W-shaped gusset folds is formed on both side edges by passing through a gusset 10; The cutting blade 12 cuts the fold at the center of one gusset fold. Next, the feeding of the belt-like film is switched to pitch transfer by a transfer means (not shown), and the film 4 is cut by the punching blade 13 and the punching receiving plate 14 for each width of the bag body at the side edge where the fold of the inner center is cut. A sheet is punched out to form a hand-held part. The weld receiving plate 15 is inserted between the gusset folds on both side edges, and the substantially V-shaped heat welding blades 16 are pressed on both side ends of the boundary line between adjacent bags, and two gusset-folded films are used as side edges. It is welded in the form of a diagonal line. Finally, the belt-shaped film is melted by pressing the hot cutting blade 17 for each width of the bag body, and the used newspaper recovery bag 18 is completed.

In this embodiment, (1) gusset folding to (5) fusing or (5 ′) cutting is divided into two steps, for example, (1) a band-shaped film having a pair of W-shaped gusset folds on both side edges is formed. Or (1) forming a strip-shaped film having a pair of W-shaped gusset folds on both side edges, and (2) cutting the fold at the inner center of one gusset fold and winding it once. It can also be used as a raw film for the process.
In this embodiment, (1) gusset folding is the first step, (5) fusing or (5 ′) cutting is the last step, but (2) cutting the middle fold, (3) punching, and (4) Each process of welding can be replaced in an arbitrary order. In the method of the present invention, instead of the step of (5) pressing the hot film cutting blade for each width of the bag to melt the band film, (5 ′) pressing the hot film cutting blade for the width of the bag film. It is also possible to perform heat welding with two parallel heat welding wires and then cut between the two heat welding wires with a cutting blade. Further, in the embodiment shown in FIG. 3, in the (4) welding step, two upper films and two lower films are thermally welded simultaneously, respectively. The welding of the sheets can also be performed separately.
As shown in FIG. 1, the used newspaper recovery bag manufactured by the process shown in FIG. 3 becomes a finished product in a folded state, and can be stored and transported by packing the number of shipping units as it is.

A second aspect of the method for producing a used newspaper recovery bag of the present invention is as follows: (1) a pair of W-shaped gussets on both side edges while transferring a long tube-shaped biodegradable plastic film having heat sealability Forming a band-shaped film having folds, (2) cutting a fold at the center of one gusset fold, (4) inserting a weld receiving plate between gusset folds on both side edges, A step of pressing approximately V-shaped heat welding blades on both side edges of the boundary line, and welding two gusset-folded films in a line that forms an oblique direction with respect to the side edges; A process of pressing the thermal cutting blade for each width and fusing, or (5 ') pressing the thermal welding blade for each width of the bag to weld it and then cutting it with the cutting blade to separate the bag Then, (6) stack the separated bags, A step of punching the side edge of the fold line at the center of the part with a punching blade.
FIG. 4 is a process flow diagram of another embodiment of the method of the present invention. While continuously transporting the long tube-shaped biodegradable plastic film 9 having heat sealability, a band-shaped film 11 having a pair of W-shaped gusset folds is formed on both side edges by passing through a gusset 10; The cutting blade 12 cuts the fold at the center of one gusset fold. Next, the feeding of the belt-like film is switched to pitch transportation by a transportation means (not shown), and the weld receiving plate 15 is inserted between the gusset folds on both side edges, and a substantially V-shaped heat is formed at both ends of the boundary line between adjacent bags. The welding blades 16 are pressed, and two gusset-folded films are welded in a line that forms an oblique direction with respect to the side edges. Further, the belt-shaped film is melted by pressing the thermal cutting blade 17 for each width of the bag body, and the bag body 19 is separated. Finally, the separated bags are stacked, and the side edge of the inner center fold cut is punched out with a punching blade to form the punched portion 6 to complete the used newspaper recovery bag 18.

In this embodiment, (1) gusset folding to (5) fusing or (5 ′) cutting is divided into two steps, for example, (1) a band-shaped film having a pair of W-shaped gusset folds on both side edges is formed. Or (1) forming a strip-shaped film having a pair of W-shaped gusset folds on both side edges, and (2) cutting the fold at the inner center of one gusset fold and winding it once. It can also be used as a raw film for the process.
In the continuous process of this embodiment, (1) gusset folding is the first process, (5) fusing or (5 ′) cutting is the last process, but the intermediate (2) fold cutting and (4) welding Each process can be interchanged. In the method of the present invention, instead of the step of (5) pressing the hot film cutting blade for each width of the bag to melt the band film, (5 ′) pressing the hot film cutting blade for the width of the bag film. It is also possible to perform heat welding with two parallel heat welding wires and then cut between the two heat welding wires with a cutting blade. In the embodiment shown in FIG. 4, (4) in the welding step, two upper films and two lower films are thermally welded simultaneously, respectively. The welding of the sheets can also be performed separately.
Since the used newspaper recovery bag manufactured by the process shown in FIG. 4 becomes a finished product in a folded state, it can be packed and stored and transported as it is.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
Example 1
A tube-like film having a thickness of 30 μm and a folding width of 540 mm is formed from an aliphatic polyester [Showa Polymer Co., Ltd., Bionore No. 5151] at a cylinder temperature of 150 to 155 ° C. and a die temperature of 145 to 155 ° C. by an inflation method. did.
About the obtained film, the tension test was done according to JISZ17027.5. The tensile strength in the longitudinal direction was 63.4 MPa and the elongation was 360%, and the tensile strength in the transverse direction was 61.9 MPa and the elongation was 820%.
Two 200mm x 200mm films are stacked and heat sealed using a 2mm x 200mm sealing bar at a temperature of 175 ° C, a pressure of 220kPa and a sealing time of 0.3 seconds, and a 10mm wide dumbbell is punched out. A test piece was prepared and a heat seal strength test was performed according to JIS Z 1711 8.4. The heat seal strength was 12N.
Example 2
Using the tubular film formed in Example 1, according to the process shown in FIG. 3, a used newspaper recovery bag having the shape shown in FIG. 1 was produced. The size of the bag is that the depth a of the bottom edge is 110 mm, the length b of the long side of the bottom is 315 mm, the depth c of the bag is 330 mm, the depth of the upper edge of the gusset is 100 mm, the center of the upper edge The hand-punched part punching width of the part is 220 mm.
Three newspaper waste paper collection bags each contained 5 kg of waste newspaper waste paper, and a drop test was conducted. It was dropped from a height of 10 cm from the floor board, and then the height was increased in steps of 10 cm, and the dropping was repeated until the bag was broken. Two pieces were normal up to 150 cm, and broke when dropped from a height of 160 cm. The remaining one was not abnormal up to 120 cm and broke when dropped from a height of 130 cm. All of them have sufficient strength for practical use as used newspaper waste bags.

    The newspaper used paper collection bag of the present invention has sufficient strength to store and handle used paper, there is no broken bag during transportation, etc., and it is biologically decomposed and disappears after use. No incinerator is required. According to the manufacturing method of the present invention, such a used newspaper recovery bag can be efficiently and economically manufactured through a series of steps.

It is the top view and cutting part end view of the one aspect | mode of the newspaper used paper collection bag of this invention. It is a perspective view which shows the state which opened the used paper newspaper collection bag of this invention. It is a process flow diagram of one mode of implementation of a method of the present invention. It is a process flow diagram of other modes of implementation of the method of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gazette folding 2 Welding wire 3 Tip part of welding wire 4 Gazette folding 5 Hand-carrying part 6 Punching part 7 Welding wire 8 Welding wire tip part 9 Biodegradable plastic film 10 Gazette 11 Strip film 12 Cutting blade 13 Punching blade 14 Punching Receiving plate 15 Welding receiving plate 16 Thermal welding blade 17 Thermal cutting blade 18 Newspaper waste paper collection bag 19 Bag body

Claims (6)

  A newspaper waste paper collection bag made of biodegradable plastic film with heat-sealability that forms a handbag and a rectangular parallelepiped bag when storing used paper. W-shaped gusset folds on the top and bottom edges of the bag Both sides of the bag are melted or welded, the upper edge gusset fold is cut at the inner center crease, the film is punched at the center of the upper edge to form a handbag, the outer and inner sides of the gusset fold A used newspaper recovery bag, wherein a pair of films is welded in an oblique direction from the vicinity of the folded edge of the upper edge and the bottom edge of the gusset to the upper edge and the bottom edge of the bag.   The used newspaper recovery bag according to claim 1, wherein the biodegradable plastic film has a heat seal strength of 5 N / 10 mm or more.   The used newspaper recovery bag according to claim 1, wherein the biodegradable plastic film is an aliphatic polyester film.   4. The used newspaper recovery bag according to claim 3, wherein the aliphatic polyester is a polybutylene succinate or polybutylene succinate adipate or a polymer film obtained by chain-extending them using a diisocyanate compound.   (1) forming a strip-shaped film having a pair of W-shaped gusset folds on both side edges while transferring a long tube-shaped biodegradable plastic film having heat-sealability; (2) one gusset fold (3) a step of punching four films with a punching blade and a punch receiving plate for each width of the bag body at the side edge of the side where the inner center fold is cut, (4) ) Insert a welding backing plate between the gusset folds on both side edges, press the substantially V-shaped thermal welding blades on both side edges of the border of adjacent bags, and put two gusset-folded films against each side edge And (5) a step of pressing the thermal cutting blade for each width of the bag and fusing (5 ′) the band-shaped film for each width of the bag. Press the heat welding blade against A method for manufacturing a used newspaper collection bag, comprising a step of cutting with a cutting blade after wearing.   (1) forming a strip-shaped film having a pair of W-shaped gusset folds on both side edges while transferring a long tube-shaped biodegradable plastic film having heat-sealability; (2) one gusset fold (4) Inserting a weld receiving plate between gusset folds on both side edges and pressing substantially V-shaped thermal welding blades on both side edges of the boundary line between adjacent bags, A process of welding two folded films in a line that forms an oblique direction with respect to the side edge, (5) fusing the band-like film by pressing a thermal fusing blade for each width of the bag, or (5 ′) After the belt-like film is welded by pressing the heat welding blade for each width of the bag body, the belt film is separated by cutting with the cutting blade, and then (6) stacking the separated bag bodies, Side edge of the fold cut A method for producing a used newspaper recovery bag, comprising a step of punching out a paper with a punching blade.

Images