JP2512863B2 - Garbage bag manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a garbage bag suitable for collection and separation and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional dust bag uses a cylindrical resin film, one end of which is sealed for the bottom and the other end of which is open for dust entrance. It was a bag. There are various synthetic resins as the film material of the dust bag, which are properly used depending on the purpose of use and the type of dust to be used. Examples of synthetic resins include vinyl, polyethylene, vinyl chloride,
There are many examples of synthetic resins such as acrylic and translucent polyethylene bags containing calcium carbonate. The bottom of the garbage bag is sealed by heat welding or adhesive. Even a cylindrical bag is inconvenient to carry before it is used. Therefore, a light press or roller is passed through the left and right ends to make a crease and form a sheet for easy carrying. Expand the folds when using.

[0003]

Needless to say, the dust bag is required to be easy to put dust, but in addition to this, it is also necessary to make it easy to put the dust bag and to carry it after putting the dust bag. . Although the conventional simple cylindrical shape with one end sealed allows easy entry of dust, the sealing part at the bottom is extremely thin and straight, which makes the bag uncomfortable to sit on. In addition, the garbage entrance is simply opened as a cylinder, which makes it difficult to carry after storing garbage, and if the entrance opening side is tied to facilitate carrying, the tied part Since the space for the bag is taken up, it is inevitable to reduce the amount of garbage stored inside.

Further, various garbage bag shapes are conceivable in order to make it easier to put the garbage in after carrying it and to carry it. However, such a shape also satisfies the requirement of the ease of manufacturing the garbage bag. Preferably. An object of the present invention is to provide a garbage bag and a method for manufacturing the same that can satisfy such various requirements.

[0005]

According to the present invention, in a dust bag made of a cylindrical film whose both ends are open, two opposing surfaces along the center axis of the film are in the central axis direction and the central axis is inward. Folded to a position (or a position before the central axis position), and in this state of being center-folded, folded in two along the central axis, and one open end of the film obtained by these two folds On the other open end side of the film, a first notch is provided on the side opposite to the central axis side from the opposite side to the other open end side on the central axis side. Discloses a dust bag including a second cutout portion extending inward from a part of the surface on the central axis side facing the first cutout portion.

The present invention further relates to a dust bag made of a cylindrical film having both ends open, in which two opposing surfaces along the central axis of the film have a central axis position (or central axis) in the central axis direction and inward. (The position before the position) is folded inward, and in this folded state, 2 along the center axis.
And then folded along the central axis for each fold more than once, sealing one open end side of the film obtained by the final fold, and finally bending the other open end side of the film. A first notch is provided on the side opposite to the central axis obtained in step 2 from the opposite side to the other open end, and the central axis obtained by the final bending opposes the first notch. Disclosed is a dust bag including a second cutout portion extending inward from a part of the surface on the central axis side.

Further, in the present invention, in a dust bag made of a cylindrical film having both ends open, two facing surfaces along the central axis of the film have a central axis position (or central axis) in the central axis direction and inward. (The position before the position) is folded inward, and in this folded state, 2 along the center axis.
Disclosed is a dust bag that is folded into two and seals one open end side of the film obtained by these two folds.

Further, in the present invention, in a dust bag made of a cylindrical film whose both ends are open, two opposing surfaces along the central axis of the film have a central axis position (or a central axis) in the central axis direction and inward. (The position before the position) is folded inward, and in this folded state, 2 along the center axis.
Disclosed is a dust bag which is folded into one and is further folded one or more times along the central axis of each folding, and one open end side of the film obtained by the final folding is sealed.

Further, the film is made of any one of synthetic resin materials such as polyethylene, nylon and vinyl chloride. Further, there is an example of paper instead of film.

Further disclosed is a method of making these trash bags.

[0011]

According to the present invention, the bottom of the dust bag is formed by stacking four folded sheets, and by sealing this, a stable and strong dust bag bottom is formed.

Further, according to the present invention, since the first and second notches are provided, the gripping portion and the hole are formed. Further, according to the present invention, by repeating the bending twice or more,
A bottom is formed by stacking folded sheets such as 16 sheets and 16 sheets, and by sealing this, a thick linear seal portion is formed and a stable and strong dust bag bottom is formed. Even in such a dust bag, by providing the first and second cutout portions, a large number of gripping portions and holes such as eight and sixteen can be formed.

Further, according to the present invention, by making the first and second cutout portions have various sizes, it is possible to form the gripping portions and the holes having various sizes. Further, according to the present invention, since the center-folded portion is provided, it is possible to form a larger hole size by combining with the shape of the second cutout portion.

[0014]

EXAMPLE In this example, a polyethylene material containing 30% calcium carbonate is used as the material.
A raw bag made of this polyethylene material (named the raw bag from the place where the bag is made) is a cylindrical film, which is made into a sheet and wrapped around a roll to a suitable length during the production of garbage bags. Cut and process to produce garbage bags. There are various thicknesses of this bag, such as an extremely thin and fluttering bag, and a bag having a thickness that does not easily tear even if a heavy object is put in and carried. In the present embodiment, the latter is targeted, but the present invention is not limited to this. The diameter of the cylindrical shape is different according to the size of the dust bag, and the corresponding material (determined by the material and the size of the diameter) is selected according to the type of dust bag to be manufactured, and it corresponds The waste bag is manufactured by cutting and processing with the length.

1 (A) to 1 (D) show the steps of manufacturing the garbage bag of the present invention. FIG. 1E shows an enlarged view of the portion A of FIG. As shown in FIG. 1A, first, a raw bag made of a cut cylindrical polyethylene material film is prepared. The upper and lower ends 4 and 5 of the raw bag 1 are both open. Two straight sides of the raw bag 1 that face each other (this can be achieved by lightly pressing the sheet (this can be achieved by passing between two rollers) in the vertical direction along the left and right folds) (Part) is bent inward toward the center axis C of the film (center folding). This state is shown in FIG. Reference numerals 6 and 7 in FIG. 1B indicate the center-folded portions. This center-folded end may be brought to the position of the central axis (this example will be described later), or it may be located at an arbitrary distance d from the central axis C. FIG.
(B) discloses the latter example.

Incidentally, the center folding as shown in FIG. 1 (b) is carried out when a raw bag of a cylindrical polyethylene material film is manufactured.
May go. That is, the polyethylene granules are melted, and then the melt is blown out from the circular slice surface to continuously produce raw bags, which are then formed into a sheet and wound on a winding roll. A step of performing center folding is added as a step before the step of lightly pressing the sheet. For the center-folding process, for a polyethylene material film that bulges into a cylinder (this can be achieved by blowing compressed air from the inside when blowing),
Press the thin rods from the opposite sides of the left and right. By pressing with this rod-shaped body,
A center fold is formed, and after or after the center fold, the polyethylene material is pressed into a sheet and wound on a roll. As a result, the polyethylene bag, which is formed into a sheet in a state of being folded in the middle, is successively wound around the roll. And if it cut | disconnects to an appropriate length, it will be in the state of FIG.

Next, the original bag in the middle-folded state of FIG. 1B is folded in two with the central axis C as a reference. This state is shown in FIG. An enlarged view of a portion A on the open end 4 side of FIG. 1C is shown in FIG. Figure 1 (e)
Although the example of the open end portion 4 side is shown, the open end portion 5 has the same configuration. For the sake of convenience, the symbols shown in FIG. 1 (e) in the enlarged view will be used in the following description for the end 5 side. One of the upper and lower open ends of the original bag 1 obtained by folding in half (this is 4 on the side of the central axis C, as can be seen from FIG. 1D).
5 sheets are sealed, which has a multi-layered sheet structure including a single sheet and a middle folded portion of 8 sheets. Figure 1 (d)
The seal portion 8 is shown in FIG. Since the seal strength of the seal portion 8 is weak if the end portion 8 itself is provided, the seal portion 8 is provided slightly inside the end portion 8. As a sealing method, a method of heat welding is used. As a result, the four and eight multiple sheet portions of the one open end portion 5 are integrally welded at the seal portion 8 to form a bag bottom as a dust bag.

The raw bag having the bag bottom can be directly used as a garbage bag. When using it as a garbage bag, expand the other open end 4 as an entrance as shown in FIG.
Garbage will be put inside from this entrance. According to the dust bag having such a structure, since the bag bottom is made of the multilayer sheet obtained by folding, the bag has a predetermined thickness even when dust is not contained. In addition, the dashed-dotted line part 1A shows a fold in FIG. It shows that the raw bag has a crease when pressed lightly, and that it remains when it is unfolded. For this reason, when dust starts to be put in, it is easy to sit in, and since the seal is made into multiple layers, the strength of the bottom is large, and even if a heavy object is put in, the seal portion will not break. Also,
It is a simple process from the viewpoint of the production process, and it is possible to generate a comfortable-to-use garbage bag without greatly increasing the equipment. Further, if pressed in a sheet shape in the state of FIG. 1D, the sheets can be stacked and placed in a cardboard box, can be used for transportation, and can be easily taken out from the cardboard box.

Note that FIG. 2 is a view in which the upper entrance portion is lightly laterally widened, but the lateral entrance portion is enlarged by further laterally pulling and expanding it. When the bag is pulled further horizontally and expanded, the appearance as a dust bag is significantly different from that shown in FIG. 2 and the strength as a dust bag can be further enhanced (however, the exact same strength exists in FIG. 2 as well). are doing). FIG. 3 shows an explanatory view of when it is further pulled out to the side and is shown in FIG.

FIG. 3A is a front view of the sealing portion 8 after sealing, as viewed from the front. In this front view, the end of the seal portion on the side of the central shaft C is designated by Q, and the seal end portion on the opposite side is designated by P. In FIG. 3B, the end portion 4 of FIG.
I reprinted the enlarged view at. When the inlet portion on the side of the end portion 4 is pulled laterally and unfolded, the vertices 2A, 2B, 3A and 3B of the open end portion (fold portion) existing at the upper portion on the seal end portion P side are respectively shown in FIG. Spread in the direction of the arrow shown in. On the other hand, the seal portion 8 at the bottom does not spread because it is fixed by this seal. At the intermediate portion between the apex portions 2A, 2B, 3A, 3B and the seal portion 8, the closer to the seal portion 8, the narrower the spread,
The closer to the top, the wider the spread. Apex 2A,
The maximum spread of 2B, 3A, 3B is the size of the original cylinder.

In the case of pulling laterally and widening as described above, the upward direction along the end portion P acts in the expanding direction, but the upward direction along the end portion Q is small, and as a result, as shown in FIG. ), The end Q is in the direction of the arrow and the top 2
It moves with the spread of A, 2B, 3A, and 3B. When the tops 2A, 2B, 3A and 3B are fully opened, the ends P and Q are substantially aligned on a straight line in the vertical direction. Then, the end portion P becomes the bellows portion of the bottom most protruding downward, and a substantially round bottom portion is formed with the end portion P as the navel.

In FIG. 4 (a), the apex 2A, which is the entrance,
The state of the bag in the state where 2B, 3A, and 3B are fully opened (opened) is shown. The part P-Q in Fig. (A) is the seal part 8, which is located almost in the center of the inside of the bag.
Almost vertical. The dotted line portion from the P-Q portion to the left and right shows the spread of the seat portion directly connected to the seal portion 8 to the P-Q to the left and right, and the lower dotted lines 6A and 7A are shown in FIG. 3B, the end portion due to the center bending, and the upper dotted lines 6B and 7B show the end portion according to the position of the central axis position C without the center bending in FIG. 3B. 6A and 7A are substantially straight lines, 6B and 7B are also substantially straight lines, and when P is seen from the Q side, these two straight lines are substantially orthogonal. Further, R indicates a round bottom having an end P as a navel. 4B is a front view of FIG. 4A from a direction in which 6B and 7B are parallel to the paper surface, and 6A and 6B are indicated by dots because they are orthogonal to it.

In the case of using such a bag, as can be seen from the figure (b), the seal portion 8 is positioned in the direction perpendicular to the end portion P, and the bottom has a round bottom with the end portion P as a navel. It becomes the shape. Furthermore, the round bottom R has only the end P as the seal portion,
There is no remaining seal leading to PQ. As a result, even if dust is put in the bag and a weight such as a thick arrow is applied downward, if the bag is tolerable to the weight as long as it is within a rupture allowable range determined by the film thickness and strength of the polyester material. Become. On the other hand, in a bag in which the entire seal portion or a portion close to half of the seal portion forms the bottom portion, the weight within the permissible breakage range of the seal portion is the limit. Here, the permissible rupture range of the seal portion is considerably smaller than the permissible rupture range determined by the thickness and strength of the polyester, so that this embodiment has an advantage that considerably heavy dust can be accommodated and carried.

At this point, referring to the example of FIG. 2, when a heavy object is stored, the bottom moves downward, and the state shown in FIG. 4 is obtained. Therefore, the strength is similar to that of FIG.

Further, as shown in FIG. 4C, the weight is generally applied to the outside of the center rather than the center (how the dust is put in depends on the shape of the dust), and as a result, the round bottom portion R is more centered than the center. Also, the outside is depressed downward, while the central part is pulled upward. As a result, the end portion P is also pulled upward, concentration of force on the end portion P is eliminated, and the load on the seal portion is further reduced.

In the examples shown in FIGS. 2 and 4, the thin film does not always have the same shape without dust. As the film becomes thinner, the folds are less noticeable, and when the bag is opened, the round bottom tied at the bottom portion P hangs down.

Note that there may be a deformation in which the center of FIG. 1C is further bent once or more. As the number of folds increases, the width of the bag bottom in the longitudinal direction also decreases, so the number of folds is limited to about twice.

A second embodiment will be described. When used as a dust bag in the state of FIG. 1 (d), the open end of the dust entrance is rugged. In order to carry this garbage bag after storing it, it is necessary to tie the entrance side or bind it with rubber or the like. Furthermore, even for workers who carry and sort garbage, since the entrance side handles various ways of tying and tying,
Inconvenient to handle.

Therefore, in the second embodiment, the open end portion of the dust entrance side is provided with a grip portion for carrying around and a hole portion that can be easily attached to a dust box or the like. This second embodiment is shown in FIGS. Figure 5
FIG. 1A is a view of the state of FIG. 1D, in which the bag 1 is cut at a surface 10 opposite to the central axis 9 as shown by a dotted line to form a first cutout portion 11. Was formed. Central axis side 9
Then, the second notch 12 was formed by cutting as shown by the dotted line. The first cutout portion 11 is formed by smoothly cutting in a downward direction from the surface 10 toward the inner side, and further smoothly cutting in a downward direction from the lower side, and cutting off a part of the open end portion 4. The second cutout 12 is the first cutout 4
It is formed by cutting off a part of the surface 9 facing to the inside in a circular or elliptical shape on the inner side on the left side of the drawing from the tip of the center-folded portions 6 and 7. FIG. 5B shows the state after cutting off. The garbage bag is completed by forming these two notches 11 and 12.

FIG. 6 shows a state in which the dust bag of FIG. 5 is expanded. To further expand, pull in the direction of the arrow.
In the figure, the one made by the first notch 11 is 4
The four gripping portions 13 to 16 and the four holes 17 to 20 formed near the center of the gripping portions 13 to 16 are the holes formed by the second cutout portion 12. Where holes 17 and 1
Holes 18 and 20 are large compared to 9. This is caused by the incision in the hole 12 and the smaller holes 17 and 1
9 is caused by the notch 12A at the end of the center-folded portion, and the larger holes 18 and 20 are caused by the notch 12B from the surface 9 at the portion without the center-fold. If the cut 12A is located closer to the center axis C than the end of the center-folded portion, the holes 17 and 19 are not formed and only the holes 18 and 20 are formed. Incidentally, 13
The one indicated by A is after bending.

Further, there is a connecting portion 21 between the adjacent gripping portions 13 and 14 in FIG. The connecting portion 21 is smoothly cut from the gripping portion side from the lower side, and then smoothly rises toward the vicinity of the center, and has a triangular shape at the center. This shape is the result of making a smooth downward cut and a smooth upward cut by the first notch portion 11. Four grips 13
~ 16 and how to use the four holes 17 to 20 will be described.

(1) Gripping portions 13 to 16 ... There is a method of holding the trash bag after storing it and using it as a handle by directly grabbing the grabbing portion. Furthermore, by binding or tying the opposing gripping portions 13 and 15 and tying or tying 14 and 16 to each other, the dust inside becomes a sealed state, and holding this binding or tying portion in the hand, it is provided for carrying around. You can also

(2) Holes 17 to 20 ... Putting a finger at the time of carrying makes it convenient for carrying.

(3) Use in trash box: Stations, department stores, parks, and various households have various fixed or portable trash boxes. You may put garbage directly into the trash box, but since the trash box gets dirty, it is often used by putting a disposable bag inside the box. The trash bag of this embodiment is used as such a disposable trash bag. In FIG. 7, the trash box 30
An example of The upper part 33 of this box is open and serves as a dust entrance. Handles 31 and 32 are formed on the circumference of the upper portion 33 of the box at positions facing each other, and are used for fitting with the lid and for carrying and holding. In such a trash box, the trash bag of FIG. 6 is stored along the inner wall of the box, and the two facing gripping parts 13 and 15 (or 14 and 16) of the gripping parts 13 to 16 are taken out. And the holes 17 of the grips 13 and 15 in the grips 31 and 32.
And pass through 19. This state is shown in FIG. As a result, the dust bag 1 is fixed to the box 30, and there is no hindrance to throwing in dust. Here, the handles 31 and 32 have various sizes depending on the dust box. So 2
By providing holes 17 and 19, and 18 and 20 of three different sizes, it was decided to use them properly according to these sizes. There are also examples of four handles in the trash box, and in such a box, the holes 17 to 20 of the four grips 13 to 16 are to be passed through all of the handles (obviously, it is possible to pass them. Use a garbage bag with holes 17 to 20).

(4) Utility of the connecting portion 21 ... Since it has a role of connecting adjacent gripping portions, it will be described as a utility relating to such gripping portions. Due to the shape of the cut portion 11 as shown in FIG. 5, the connecting portion 21 has a gentle curve on the end portions 21A and 21B close to the grip portion as shown in FIG. 6, and has a convex portion from the end portion to the center. It is a curved line that forms. As a result, the end portions 21A, 21B and the central portion are less likely to be torn in the vertical direction even if a force is applied in the lateral direction, and even when the heavy dust is stored inside, the dust bag is not torn during carrying.

The third embodiment will be described. The second embodiment is an example in which the center-folded portion is not bent to the central axis, but the present embodiment is characterized in that the center-folded portion is bent to the central axis. This is shown in FIGS. 9A to 9C.
In the raw bag as shown in FIG. 9 (a), the center-folded portions 6A and 7A are formed up to the central axis position C. This figure is shown in FIG. Then, it is folded in two with the central axis C as a reference, as shown in FIG. FIG. 9D shows B of FIG. 9C.
An enlarged view of the part is shown. The following is the same as FIG. Further, as in the case of FIG. 1, the center-folded portions 6A and 7A may be formed in the step of making the raw bag.

The trash bag produced by the above steps may be used as it is as in the first embodiment. In this case, it is possible to provide a garbage bag that is comfortable to sit on and has a strong bottom.

FIG. 10 shows an embodiment in which the garbage bag 1 made in FIG. 9 is provided with a notch as in the second embodiment. 11A is the first notch, 12C is the second notch,
The shape of the notch 11A may be the same as that of the second embodiment. In the second embodiment, the end portion of the center-folded portion is located in front of the central axis, so the second cutout portion 12 includes the end portion. However, in the embodiment of FIG. 8, the end portion of the center-folded portion is included. Since the part is located on the central axis, the consideration as in the second embodiment is not necessary. The size (shape) of the cutout 12C is determined by the size of the hole.

According to the third embodiment, the size of the holes formed by the second cutout portion 12C is the same for all four holes. Therefore, the trash box can be used by being attached to a box having four handles of the same size.

Of course, even in the third embodiment, it is possible to perform bending more than once.
In each of the above-mentioned various embodiments, polyethylene is used as an example, but a raw bag made of other synthetic resin such as vinyl chloride, acryl or polypropylene may be used. Paper can be produced and used in the same manner.
Further, although the manufacturing example of the procedure of making the center fold and the center fold is shown, there may be a case where there is a difference in the process such that the center fold is performed while the center fold is performed, or the center fold is performed after the center fold. .

FIG. 11 shows an embodiment of the raw bag manufacturing apparatus of the present invention. This example is an example of an example in which a raw bag is manufactured by folding it into a sheet shape while forming a center-folded portion. FIG.
In 1 (a), polyethylene particles are put into the hopper 100. The granules are melted by a grinder 101 provided below the hopper 100. The extruder 102 is
Die 1 by extruding melted and fluidized polyethylene
Send to 04. The die 104 is a device that blows out a polyethylene fluid in the form of a cylindrical film, and the blowing port is formed in a slit shape. Further, a blower device 103 is connected to this die 104, and has a function of blowing air into the inside of the cylinder to expand it into a cylindrical shape, and is also used for cooling the film from outside the cylinder. The cylindrical film 105 is pulled upward and pressed from both sides by the pressing plates 106 and 107 to enter the pressing roller 108 for making a crease. Holding plate 10
6 and 107 are pressed from both sides so that the lower side is opened and the upper side is a narrow gap, so that the cylindrical film is guided inside the holding plates 106 and 107 and narrowed to enter the roller 108. Go on. Thus, the film smoothly enters the roller 108 and is pressed and pressed into a sheet to make a crease.

On the other hand, rod-shaped members 115 and 116 are provided in a direction perpendicular to the pressing plates 106 and 107. The rod-shaped bodies 115 and 116 are used to form a center-folded portion. That is, as shown in a perspective view in FIG. 11B and a side view in FIG. 11C, the rod-shaped bodies 115 and 116 are attached to the holding plate 10.
6 and 107, which are perpendicular to each other and open downwards and have a predetermined gap 118 upwards. This spacing 118 determines the spacing between the ends of the center fold (2d in FIG. 1). Therefore, the end portion of the center-folded portion as shown in FIG.
In the case of realizing the configuration in which the position is set to, the gap 118 may be a thin gap through which the film passes.

The raw bag pressed into a sheet by the roller 108 is wound around the rotary roller 114 of the roller device 113 via the rollers 109, 110, 111 and 112. At this time, the raw bag has the center-folded portion already formed.

According to the present embodiment, the center-folded portion can be formed in the process of making the original bag, and there is an advantage that the number of subsequent steps for manufacturing a garbage bag can be reduced.

FIG. 12 is a view showing a dust bag manufacturing apparatus of the present invention. It is assumed that the original bag 121 has already been half-folded by the manufacturing apparatus shown in FIG. The raw bag 121 is attached to the roll device 121A on the carrier 120. The leading end of the raw bag 121 is led out via the roller 123. The member 124 uses the raw bag 122 derived from the roller 123,
It is a member that is bent in two along the central axis and is always pressed in the direction of the arrow. The raw bag 122 folded in two by the member 124 is used for the heater 12 at regular intervals.
It is heated and melted at 5 and sealed. Here, “at regular intervals” corresponds to the vertical length standard (height) of the dust bag. next,
This tip is taken in by the roller 126, and the cutter 127 cuts the raw bag 122 at regular intervals, that is, in conformity with the length standard, based on the sealed portion. The cut raw bag 122 becomes a dust bag 128.

Here, the roller device 121 and the roller 12
3, 126, the heater 125, and the cutter 127 are controlled by the control device 129. The control contents are as follows.

Roller device 121, rollers 123 and 126
...... Both are controlled so as to pull out the raw bag 122 on the transport path and to give tension for pulling out. This can be achieved by the control device 129 controlling 121, 123 and 126. As a result, the raw bag 122 on the transport path is
Are regularly transported according to a predetermined pulling force.

Heater 125: The heater 125 is constantly supplied with a constant current during the manufacture so as to generate heat enough to be heat-sealed. The heater is movable, and when the portion to be sealed comes directly below, the heater approaches the portion and heat seals. Move away from other parts. In order to perform this movement control, it is indispensable to grasp the transport speed of the raw bag 122 and correctly recognize the portion to be sealed. The control device 129 detects the transport speed and controls the movement of the heater unit.

Cutter 127 ... Again, it is necessary to control the movement so as to perform an operation of cutting into a standard unit of a fixed length including the seal portion of the raw bag 122. The control device 129 performs control for this purpose.

The control device can be implemented by a microcomputer and various drive mechanisms. Further, although it is cut after sealing, it may be wound on another large roller without cutting and cut in another step. Further, the folding mechanism centering on the central axis C can be various mechanisms other than those shown in the figure, such as gripping and bending the sheet end portion.
Further, when the center folding is performed up to the central axis, the number and size of the gripping portions and the holes are exactly the same regardless of whether the two cutouts are from the left or right.

FIG. 13A is an embodiment diagram in which the two separate steps of FIGS. 11 and 12 are combined into one. An isosceles triangular plate 130 is installed on the exit side of the roll 110.
The film 105 is conveyed while being pressed against the surface along 0. Then, a film 105A folded in half is obtained from the triangular vertex portion on the exit side from the triangular plate 130, and the film 105A is wound around the winding roll 133 via the rolls 131 and 132. FIG. 13B shows a top view of the triangular plate 130 and the film 105. The triangular plate 130 has an isosceles triangular shape, and the film 105 is conveyed from a direction orthogonal to the triangular plate 130. The film 105 is conveyed while being pressed against the surface of the triangular plate 130.
As a result, the film 105 is gradually bent into a triangle and advances toward the apex, and reaches the apex and is folded in two from the center. This is the state of the film 105A. This triangular plate 130 can also be applied to the example of FIG.

It is to be noted that the film is guided upward from the roll 109, and is further bent to the upper side of the roll 108, and the film is downwardly directed along the roll 108 along the front side or the rear side of the paper. There is also a method in which the triangular plate is installed and bent in two during the downward conveying process. In this case,
As compared with 3, the space in the lateral direction is small and the space can be efficiently used.

Further, in FIGS. 12 and 13, there is also an example in which the printer is installed before being folded in two. The printing device is a one-color or multi-color gravure printing machine, which prints its name (trademark) and purpose of use on a polyethylene bag. After being folded in two, the printing space is reduced because the width is halved. Therefore, a printer is provided to print before folding in half. Further, since it becomes difficult to print when the number of folded and stacked sheets is large, there is also a purpose of printing after completion of center folding.

Although the garbage bag is used as an example, it can be used as a bag for carrying clothes or a bag for carrying.

[0055]

According to the present invention, the bottom of the dust bag is formed by stacking a plurality of sheets, and the sheets are sealed by heat welding or the like, so that the dust bag can be easily seated and the bottom strength can be improved. We were able to provide a trash bag that is strong and has excellent storage and portability.

Furthermore, according to the present invention, the bottom portion of the dust bag is smaller than the diameter of the film, but since the dust inlet has the original cylindrical size, There is no hindrance to the input of.

Furthermore, according to the present invention, the gripping portion and the hole are formed only by providing the first and second cutout portions, and it is possible to provide the garbage bag which is excellent in the installation property and the portability.

Furthermore, according to the present invention, by freely selecting the size and position of the first and second cutout portions, it is possible to form gripping portions and holes of various sizes, and to use various dust boxes. Can be applied.

Further, according to the present invention, the provision of the center-folded portion makes it possible to form large and small holes, which makes it possible to apply the dust box to various sizes.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a manufacturing process of a garbage bag of the present invention.

FIG. 2 is a diagram showing an embodiment of a garbage bag according to the present invention.

FIG. 3 is a diagram showing a state of the present invention when used as a dust bag.

FIG. 4 is a diagram showing a state when used as a garbage bag of the present invention.

FIG. 5 is a diagram showing another embodiment of the garbage bag of the present invention.

FIG. 6 is a diagram showing a state when the garbage bag of FIG. 5 is used.

FIG. 7 is an external view of a trash box.

FIG. 8 is a diagram showing an example of attaching the dust bag of the present invention to the dust box of FIG.

FIG. 9 is an example of a process of manufacturing another dust bag according to the present invention.

FIG. 10 is an embodiment of another garbage bag according to the present invention.

FIG. 11 is an embodiment of a raw bag manufacturing apparatus of the present invention.

FIG. 12 is a diagram showing an embodiment of the dust bag manufacturing apparatus of the present invention.

FIG. 13 is a diagram showing an embodiment of the dust bag manufacturing apparatus of the present invention.

[Explanation of symbols]

 1 Raw Bag 2, 3 Ends 4, 5 Open Ends 6, 7 Middle Folding Part 8 Sealing Part 11 First Notch Part 12 Second Notch Part 13-16 Gripping Part 17-20 Hole

Claims (3)

(57) [Claims] 1. A method for producing a dust bag from a cylindrical film whose both ends are open, wherein two opposing surfaces along the center axis of the film are in the center axis direction and are located inward toward the center axis position. A method for producing a dust bag, which is formed by folding and folding it in the middle and folding it in two along the central axis, and sealing one open end side of the film obtained by the two foldings to form a dust bag. . 2. A method of producing a dust bag from a cylindrical film whose both ends are open, wherein two opposing surfaces along the center axis of the film are in the center axis direction and are inward toward the center axis position. Folding, folding in this state, folding into two along the central axis, and further folding once or more along the central axis for each folding, one open end side of the film obtained by final folding A method for manufacturing a garbage bag, in which a garbage bag is sealed to produce a garbage bag. 3. The manufacturing method according to claim 1, wherein after the sealing, on the other open end side of the film, a first side is provided on the side opposite to the central axis side from the opposite side to the other open end. And a second notch is formed on the central axis side from a part of the surface on the central axis side facing the notch obtained by the first notch toward the inner side. Bag manufacturing method.