JP2003300540A - Flat bag with gusset and zipper and method for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat bag with a zipper and gussets in which left and right side face parts and a bottom face part are put away between a front face part and a rear face part as double-folded gussets, and a zipper is provided on an opening part, and forked triangle ears folded and formed at end parts of the gussets for side face parts cross over the gusset for the bottom face part. <P>SOLUTION: Two folded bodies on which forked triangle ears are folded and formed and which are for forming gussets for the side face parts are piled up on left and right side edges, and point heat seals are provided at several positions thereon, and after the double-folded gusset for the bottom face part is piled up on left and right flaps extending straightly and flatly, the opening left and right flaps are folded and piled on the gusset for the bottom face part, and the rear face part is piled thereon and transverse seals and a longitudinal seal are respectively applied on both sides and the bottom edge. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The invention of the present application is such that between the front surface portion and the rear surface portion, the left and right side surface portions and the lower surface portion or the lower surface portion and the upper surface portion are respectively folded inward as a foldable gusset body,
The bifurcated triangular ears formed by folding at the end of the side gusset body straddles the gusset body for the lower surface, ensuring a square bottom and flat bottom when opening the bag. An extremely advantageous zippered gusseted bag and a method of manufacturing the same. The present invention is a three-way gusset type including a side surface gusset body and a lower surface gusset body, and in particular, the upper end of the side surface gusset body is lower than the male meshing portion and the female meshing portion of the zipper. The present invention relates to a gusseted bag with a zipper, which is located at, and is easy to manufacture in which the upper end of the side face gusset body is sufficiently sealed and heat-sealed, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A bag with a synthetic resin zipper disclosed in Japanese Patent Application Laid-Open No. 9-216642 has a gusset body for a side surface whose upper end is at right angles to the bag length direction and which has a zipper male engagement portion and a female engagement portion. It is located below the mold meshing part, and the upper end of the gusset body for the side surface part is the front part or the rear part (the one that is the lower side during bag making) and the web of one of the zippers (the one that is the lower side during bag making) ) And heat-sealed, and the upper inner surface of the side gusset body and the inner surfaces of the front and rear surfaces are heat-sealed obliquely below the upper end of the side gusset body. Has been done. As described above, the configuration in which the upper end of the side surface gusset body is sandwiched between the front surface portion or the rear surface portion and one of the webs of the zipper and heat-sealed is such that the side surface gusset body adheres in a palm shape. This is because the outer surface side does not have heat sealability. If the outer surface has heat-sealing properties, the outer edge of the side surface gusset body is also heat-sealed due to the manufacturing method. There is an absurdity that the club does not open. The bag body with a synthetic resin chuck disclosed in JP 2000-177751 A solves the problems of the bag body with a synthetic resin chuck disclosed in JP 9-216642 A. That is, if the upper end of the side surface gusset body is perpendicular to the bag length direction, stress concentration may cause breakage along the upper end of the side surface gusset body. By making the upper end of the body inclined downward toward the inside, it is possible to avoid the occurrence of breakage along the upper end of the side face gusset body. This bag with synthetic resin zipper is
The web of the zipper is wide to cover the upper end of the side gusset body, which makes the material uneconomical. In addition, since the male meshing portion and the female meshing portion of the zipper cannot be attached to the front surface portion and the rear surface portion in the fitted state, the fitting of the male meshing portion and the female meshing portion of the zipper in the bag making process is not possible. If it comes off, it becomes a big problem. In the flat bag with a gusset with a zipper of JP-A-10-166477, the upper end of the gusset body for the side part is at a right angle to the bag length direction, or rather than the male engagement portion and the female engagement portion of the zipper. It is located below, and the upper end of the side surface gusset body is inclined downward toward the front surface or inward, and the upper end of the side surface gusset body is hermetically sealed to the outer surface side. It is secured by heat-sealing the upper edge at a high heat-sealing temperature. Therefore, the packaging material constituting the gusset body for the side surface portion is composed of a laminated film having a three-layer structure having heat sealability on both sides, and moreover, the heat seal temperature on the outer surface side is 10 to 30 than that on the inner surface side. A laminated film having a three-layer structure that increases in temperature by 0 ° C. is used. This gusseted flat bag with zipper can be attached to the front and rear surfaces of the zipper with the male meshing part and the female meshing part fitted together. If the fitting of the mold engagement part is disengaged, no problem will occur.
However, this flat bag with a gusset with a zipper has a low heat-sealing temperature when the upper edge of the outer surface, which is in close contact with the upper end of the packaging material forming the gusset body for the side surface, is heat-sealed at a high heat-sealing temperature. Since the surface on the side is roughened and a welding failure with the front surface portion or the rear surface portion occurs, the reliability of the heat sealability / complete sealability is deteriorated, so that it is not practically used. The gusseted packaging bag having an opening / closing chuck disclosed in JP-A-10-245046 is substantially the same as the bag with a synthetic resin chuck disclosed in JP-A-9-216642, and has the same problem. In addition to this, when a commercially available flat bag with a zipper and a gusset was investigated, it was found that the upper end of the inner surface of the side part gusset body was sealed with a double-sided sealant film tape.

On the other hand, as a square bottom bag having a side gusset that has been practically used in the past and ensuring a square bottom when the bag is opened, the lower surface portion is formed by forming the lower surface portion from the state of a flat bag with side zippers and gussets. Some bags are made by folding them on the side of the bag. The shape of this bag is substantially the same as that of the shopping bag, and the corner bottom surface is folded so as not to be folded inward (gusset fold) in parallel with the front surface portion or the rear surface portion. Therefore, when opening the bag in the bag-filling and packaging machine, the corner bottom surface becomes an obstacle, and the front surface portion and the rear surface portion cannot be opened as the corner bottom bag only by sucking and separating them with the vacuum pad. The upper part of the front part and the rear part were suction-held by a vacuum pad, separated from each other to secure an opening, blown with air and inflated to open as a bottom bag. If the flat bag having the side gussets is a bag in which the corner bottom surface is also folded inward to form a bottom gusset, that is, if it is a three-way gusset bag,
Since the square bottom does not get in the way, it can be opened as a square bottom bag by sucking and separating the front part and the rear part with a vacuum pad, and the bag opening process in the bag filling and packing machine can be well realized. Further, since there is no crease on the front surface portion or the rear surface portion, the shape retaining property, the standing property, and the appearance property are good. Therefore, between the front and rear parts, the left and right side parts,
The lower surface portion or the lower surface portion and the upper surface portion are respectively folded inward as a foldable gusset body, and the bifurcated triangular ears formed by folding at the end of the side surface gusset body are for the lower surface gusset body or the lower surface portion. It is straddling the gusset body and the gusset body for the upper surface portion, or the bifurcated triangular ear formed by folding at the end of the gusset body for the lower surface portion or the gusset body for the lower surface portion and the gusset body for the upper surface portion forms the gusset body for the side surface portion. A patent search was conducted on a gusseted flat bag with a zipper that straddles and secures a square bottom and a flat bottom when the bag is opened. JP 59-74065 A, JP 7-314587 A, JP 9 -twenty one
6638, JP 2000-153849, JP 2000-254984, JP
2001-48194, JP 2001-158057 A, and JP 2001-225849 A were found.

In the invention of Japanese Patent Laid-Open No. 59-74065, bottom heat-sealing is performed, and then the bottom of the bag is folded back with expansion and contraction without air inflow and out to form the lower surface. It is an unfinished invention that cannot be folded because it cannot be folded. The invention of JP-A-7-314587 is shown in FIG.
In the side gusset bag having the upper surface portion and the bottom surface portion shown in FIG. 6, as shown in FIG. 6, the front surface portion, the rear surface portion, the right side surface portion, and the left side surface portion are joined with a palm-shaped heat seal rib.
The side gusset cylinder shown in Fig. 2 is made, the side gusset cylinder is slightly opened, and the bottom gusset folded bottom surface shown in Fig. 2 is inserted into the openings at both ends. It is a flat bag with a bottom gusset, and is a bag obtained by trimming the protruding parts of the top and bottom parts by trimming. With the side gusset tube slightly open, the bottom gusset fold shown in FIG. It is very difficult to hold the bottom part by inserting the bottom part, and it is difficult to properly overlap the side gussets and the bottom gussets. JP 2001-225
The invention of 849 is disclosed in Japanese Patent Laid-Open No. 7-3
Since the bag is manufactured in the same manner as the invention of No. 14587,
It has the same problem as the invention of JP-A-7-314587. The invention of JP 2001-48194 A makes a continuous flat tube having a side gusset, opens the end of the flat tube, and folds the packaging material inside with two at the center line. Since both bottom edges of the ridgeline are folded back inward and the bottom of the special bottom gusset that has a bifurcated right and left sides is inserted and bottom heat sealed, if you try to insert the entire bottom, There is a problem that the heat sealer that performs bottom heat sealing and the insertion means that grips the bottom part interfere, and you cannot perform bottom heat sealing at one time unless you insert the bottom part protruding and avoid interference. , When the bottom part is inserted into the protruding state, it is necessary to punch out the protruding part by trimming, which causes misalignment when the bottom part is inserted and flattened. However, there is no guarantee that the left and right bifurcated parts of the bottom part will be inserted into the right and left side gussets of the flat tube in order, and mass production is not possible. Also, since the side gusset cylinder is opened and the flat bottom part is inserted, the ends of the bottom part are not inserted so as to be sandwiched by the heat seal ribs, so the heat seal at the four corners cannot be performed with a sufficient width. , Low sealing performance. The invention of JP 2000-153849 A makes a continuous flat tube having a side gusset,
Cut it into a short flat tube, open one end of the flat tube, and fold the ends of the left and right side gussets to the opposite side, fold it in two and abut the V-shaped bottom part, and flatten it. After closing, it is subjected to bottom heat sealing and lower side heat sealing. The rectangular parallelepiped bag with the constriction spout shown in FIG. 1 (b) has a very large number of time-consuming steps and is low in mass productivity. Moreover, the rectangular parallelepiped bag with the molding spout shown in FIG. 1 (a) also has an extremely large number of time-consuming steps and is low in mass productivity.
In addition, there is a problem that the edges of the upper surface portion and the front surface portion that sandwich the molding spout cannot be properly held when the molding spout is attached. It is technically extremely difficult to reverse the ends of the left and right side gussets to the outside after making a continuous flat tube with side gussets, and the folding process takes a long time. Since the bottom part of the V-shape is abutted and closed flatly before performing the bottom heat seal and the lower side heat seal, the bottom part of the V-shape and the lower side heat seal are misaligned when flatly closed, and it is technically extremely difficult to achieve. The process takes a lot of time and there is no mass productivity. Furthermore, as a result of consideration, after making a continuous flat tube with side gussets and then folding the ends of the left and right side gussets outward, the side edges are aligned with the inner edges of the heat seal ribs on both sides of the flat tube. It does not match the outer edge of the heat seal rib. Therefore, the width of the bottom part of the V-shaped fold must be shorter than the width of the front part by twice the size of the heat seal rib. The heat-sealing rib with the edge of the reverse fold comes to the inside of the heat-sealing rib of the flat tube, and when this welding is performed, the width of the heat-sealing rib of the flat tube also expands inward. Therefore, when the bag is opened, the heat-sealing ribs formed on the left and right sides of the front and back sides are twice the width of the upper part at the bottom, so the top and bottom edges of the bag are not rectangular with the same cross-sectional area. The lower part of the surface is narrowed, resulting in a bag shape with poor appearance. The invention of Japanese Patent Application Laid-Open No. 9-216638 is such that the bottom portion of the bag is formed into a T-shape when viewed from the side like a shopping bag so that the bottom portion of the bag is inflated and contracted as air comes in and out. The rectangular film is overlapped on the part, and the peripheral edge is heat-sealed and folded so as to be flattened from the T-shape to the Y-shape when viewed from the side. The lower surface has a double bottom, and the peripheral edge of the lower surface is Since the heat-sealing portion is a horizontal rib instead of a vertical rib when the bag is opened, since the bottom has a double bottom, a lot of packaging material is used and mass productivity is poor.

Invention of JP 2000-254984 A and JP 2001-15
The invention of No. 8057 is sandwiched between left and right sides as a gusset body for a side surface portion in which the side surface portion is folded inward between the front surface portion and the rear surface portion, and the lower surface portion is folded inward in two. The lower surface gusset body or the lower surface gusset body in which the lower surface portion is folded inward and the lower surface gusset body in which the upper surface portion is folded inward are sandwiched between the side surface gusset body and the lower surface gusset body. Or, at the intersection of the upper surface gusset bodies, the bifurcated triangular ears formed on one of the gusset bodies straddle the side portion of the other gusset body, and the heat sealing is performed at the overlapping positions of the edges except for the opening. A method of manufacturing a gusset bag in which ribs are formed and joined. The above-mentioned prior art has nothing to do with the present invention.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Attention was paid to the inventions of 00-254984 and JP-A-2001-158057. The invention of Japanese Patent Laid-Open No. 2000-254984, as shown in FIG. 1A, FIG. 1B, and FIG. 8, transfers the first material main web and the second material main web separately from each other and provides heat sealability at a required downstream side. In the area where the inner surfaces of the first material main web and the second material main web are transferred such that they are opposed to each other and are overlapped again, and the first material main web and the second material main web are separately transferred, the inner surface of the first material main web is moved to the third side from the lateral direction. A side folding web formed by folding both sides of the material web and cutting it to a certain length is placed, and the fourth material web for forming the bottom portion is in the same direction as the transfer direction of the first material main web. As described above and integrated into the first material main web and the side folding web, and before the second material main web is overlaid on the first material main web as shown in FIGS. 1A and 1B. Or incorporate bifurcated triangular ears were folded formed in the supply direction leading end of the side folding the web in emission position so as to sandwich the fourth web of material which is folded in two,
Alternatively, as shown in FIG. 8, the side-folded web is fed onto the first material main web at the open position before the second material main web is overlaid on the first material main web, and the second material main web is fed. After stacking, the second material main web is rewound and the side folds are fed up to roll up the leading ends of the webs to fold the bifurcated triangular ears to form the fourth material web. At the line downstream position where the web and the second material main web are in close contact with each other with the third material web and the fourth material web sandwiched, horizontal heat sealing is performed at a position corresponding to the bag joint portion of the third material web, Further, a vertical heat seal is applied to a portion of the fourth material web corresponding to the bag joint portion to form a continuous laminated body, and the continuous laminated body is cut as required to form a gusset bag.

However, considering the invention of Japanese Patent Laid-Open No. 2000-254984, it has been found that the following problems occur. In the embodiment shown in FIGS. 1A and 1B, the position where the fourth material web is superposed on the first material main web is set to the upstream side of the supply position of the third material web,
Therefore, the fourth material web is hung on a triangular plate former, folded in half, and then supplied so as to be floated along the side edge of the first material main web. The third material web and the fourth material web are incorporated so that the third material web and the fourth material web are incorporated so that the third material web and the fourth material web are practically used. It is difficult to incorporate it into the web, and it is difficult to put the device into practical use. Further, in the embodiment shown in FIG. 8, the side folding web is supplied to the first material main web, the second material main web is superposed, and then the end edge of the second material main web is turned back by 180 °. By this, the tip of the third material web in the supply direction is rolled up, and a bifurcated triangular ear is formed by folding at the winding side end of the third material web, and in that state the fourth material is formed. The webs are overlapped and welded at several points, and then in the process of intermittent transfer, the winding is returned to fold the fourth material web into two and the bifurcated triangular ears of the third material web straddle the fourth material web. Because it will be like this,
It is extremely difficult to turn the second material main web 180 °. Because the second material main web is 180 °
It is ensured that the second material main web extends more than the first material main web by the size of the amount to be rolled up, and when the turning is returned after the fourth material web is superposed, the stretched portion shrinks. This is because it must be guaranteed that the original length will be restored. Since the packaging material does not have rubber-like properties, it can be rolled up using a slack at a long distance, but it is still difficult to roll 180 °, and it can be rolled up to about 90 °. It is the limit.
Further, the edges of the first material main web, the third material web and the second material main web are aligned, and the width center of the third material web is the first material main web and the second material. The edges of the first material main web and the second material main web are turned in the state of being welded to the main web. Since a pair of upper and lower plate-shaped guides for winding up cannot be inserted and installed, the edge of the second material main web can only be wound up by the vacuum means, which makes it impossible to rotate 180 °. The limit is about 90 °. Though the idea is wonderful,
Practicality is poor. Then, rolling up the edge of the second material main web results in a crease on the second material main web, and the wavy unevenness is likely to occur on the second material main web. There is a possibility that the degree of lowering than that of the first material main web may occur.

Next, the invention of Japanese Patent Laid-Open No. 2001-158057 discloses a continuous first flat film and a second flat film for constituting either the front surface portion or the rear surface portion, whose width is the bag length. It will be cut off at the end of the bag making process so that it will be larger than the required size. Then, the first flat film and the second flat film are intermittently transported with the inner surfaces facing each other and separated from each other, and in the space where the first flat film and the second flat film are separated, as shown in FIG. A side surface film for constituting a side surface portion formed by folding a web in which the length of the side corresponding to the width direction of the first flat film is equal to the bag length, the first side film when the intermittent transfer of the packaging material is stopped. The flat film is supplied onto the first flat film from the outer side in the width direction and temporarily welded.
On the downstream side of the position where the side film is temporarily welded on the first flat film, the second flat film is overlaid, and then,
A horizontal seal (side seal) is applied to the first flat film, the side film, and the second flat film at a position corresponding to the bag joint corresponding to the entire length of the side film, and then the first flat film and 10 or 12 by inserting a plate-shaped guide between the extra long edges of the second flat film.
As shown in FIG. 2, a bifurcated triangular ear is formed at the end of the side film by opening the first flat film and the second flat film to form a continuous zipper or bottom surface V-shaped section. The continuous bottom film of is overlapped with the bifurcated triangular ears and several points are welded and then the winding is returned in the process of intermittent transfer so that the bifurcated triangular ears straddle the zipper or the bottom film, so that the side Install the intersection of the gusset and the bottom gusset, then
An extended horizontal seal is applied in correspondence with the width center of the bifurcated triangular ear,
Further, a vertical seal is formed to form a bottom heat seal rib, the surplus of the first flat film and the second flat film are separated, and finally, the center of the seal width of the horizontal seal is cut to form a bag. The invention of Japanese Patent Laid-Open No. 2001-158057 is very similar to the invention of the embodiment of FIG. 8 of Japanese Patent Laid-Open No. 2000-254984, and is similar to the embodiment of FIG. It is considered to be a slight improvement of such invention. The point that the invention of JP 2001-158057 A is considered to be an improvement over the invention according to the embodiment of FIG. 8 of JP 2000-254984 is that the first flat film and the second flat film are: The width is about 20 mm to about 40 m than the bag length
The plate-shaped guide is inserted between the extra edges of the first flat film and the second flat film so as to be larger, and as shown in FIG. The second is to make the flat film easy to open. However, the excess is at the end of the bag making process. No other improvements are found. However, the invention of Japanese Patent Laid-Open No. 2001-158057 is such that, as shown in FIG. 10, a pair of upper and lower plate-shaped guides are inserted between extra edges of the first flat film and the second flat film. It is possible to open each of the first flat film and the second flat film by 90 °, but it is extremely difficult, and it is more difficult to temporarily weld the zipper or the bottom film by stacking them in such a state. As shown in FIG. 12, the side edges of the first flat film are not turned, and the side edges of the second flat film are rotated by 180 °.
It is extremely difficult to turn over for the same reason as described in the embodiment of FIG. 8 of Japanese Patent Laid-Open No. 2000-254984. Moreover,
The second flat film has creases. According to the inventor of the present application, the invention of JP 2001-158057 A is,
It is considered that the problems of the invention according to the embodiment of FIG. 8 of 000-254984 are completely inherent, and it is considered that they do not correspond to the improvement that can sufficiently solve the problems. Regarding the first flat film and the second flat film, it is necessary to provide a 5 mm wide extra for rolling up to the edge and to cut off the extra at the end of the first flat film and the second flat film. This is usually done to make the edges exactly coincide, but in the invention of Japanese Patent Laid-Open No. 2001-158057, the excess of the first flat film and the second flat film is about 20.
mm-about 40 mm, the plate-shaped guide cannot be inserted and rolled up between the extra edges, so that the extra width of the first flat film and the second flat film is increased. Therefore, the extra trimming is too large compared to the usual trimming width, and it is very uneconomical to use, and the smaller the size of the bag, the larger the extra proportion and the higher the packaging cost. Has become. In the invention of Japanese Patent Laid-Open No. 2001-158057, as shown in FIG. 8, the web is folded inward and the folding lines of the two folds at both ends are recessed to form a forked triangular ear. When the side film for forming the side surface portion is supplied, the bifurcated triangular ears are folded and the forming process is omitted as shown in FIG. 11. This is due to the heat sealability of the side film having the bifurcated triangular ears. It is considered that the inventor's understanding is insufficient and it is impossible to carry out. The reason is that the side film formed by folding up the bifurcated triangular ears shown in FIG. 8 is sandwiched between the first plane film and the second plane film, and then the side film is formed as shown in FIG. This is because if the seal is applied to the center of the width and to the entire length, the upper and lower flaps of the bifurcated triangular ear will be welded and will not open.
If it is welded so that it does not hit the bifurcated triangular ears,
Even if the first flat film and the second flat film are rolled up, the two flaps of the bifurcated triangular ear are not welded to each other, which causes a problem that they cannot be opened. Therefore, even if the upper and lower flaps are opened by another operating means, the bottom films cannot be overlapped and temporarily welded there. The bottom films can be overlapped and temporarily welded at a position at least one step further downstream than this position where the bottom films are overlapped at a midpoint of the distance required to be turned over. Therefore, after opening the flap, it cannot be processed by the other actuating means described above, and it is necessary to provide a guide for keeping the flap open for a distance of several steps. If the bottom films are piled up and temporarily welded with the flaps open, there is a problem that the guide will be an underlay of the bottom film, which will be an obstacle, and the result will be troublesome, and the device configuration will be complicated. , Adjustment becomes difficult.

Therefore, the inventor of the present application has proposed the above-mentioned Japanese Patent Laid-Open No.
The invention according to the embodiment of FIG. 8 of Japanese Patent No. 54984 and Japanese Patent Laid-Open No. 2001-15
After recognizing that it is difficult to solve the problems of the invention of 8057, attention is paid to the invention according to the embodiment of FIGS. 1A and 1B of JP 2000-254984 A to solve the problems. The present invention was made in order to achieve this. In particular, the front part, the rear part, the left and right side parts, and the lower part are made up of five packaging material sections, and the joint part is joined by a heat seal rib in the shape of a palm, and the left and right side parts between the front part and the rear part. As the gusseted flat bag with a zipper having a zipper in the bag opening, the bottom surface and the bottom surface are folded inward as a gusset body, and a method for manufacturing the same, as shown in JP 2001-158057 A. 1, only seen in Figure 11. However, this method of manufacturing a flat bag with a gusset with a zipper has the above-mentioned problems in making the bifurcated triangular ears formed by folding the end portion of the gusset body for the side portion straddle the gusset body for the lower surface portion. There is.

According to the invention of the present application, the front surface portion, the rear surface portion, the left and right side surface portions and the lower surface portion are composed of five packaging material sections, and the joint portions are joined together by a heat seal rib having a palm-like shape. In order to provide a flat bag with a gusset and a zipper with a zipper at the opening of the bag, the left and right side surfaces and the bottom surface are folded inward as a gusset body. In particular, the upper end of the side part gusset body is located below the male and female meshing parts of the zipper, and the upper end of the side part gusset body has sufficient sealing and heat-sealing strength. It is an object of the present invention to provide a gusseted flat bag with a zipper that is secured and easy to manufacture, and a manufacturing method thereof. The present invention is a flat bag with a gusset having a zipper, which can easily and satisfactorily seal the upper end of the inner surface of the side surface gusset body and has good tear-tight strength at the joint of the upper end of the inner surface of the side surface gusset body. And a method for manufacturing the same. INDUSTRIAL APPLICABILITY The invention of the present application makes it possible to assemble the overlapping portion of the gusset body for the side surface portion and the gusset body for the lower surface portion, which is stored between the front surface portion and the rear surface portion, very easily and extremely accurately in a very short time. Provided is a large flat bag with a zipper and a gusset, and a method for manufacturing the same.
The present invention can easily incorporate the overlapping portion of the gusset body for the side surface portion and the gusset body for the lower surface portion by simply adding a simple device to the manufacturing device for the flat bag with the gusset with the zipper of the popular type, (EN) A flat bag with a gusset and a zipper with a zipper that contributes to simplification of a device and mass productivity by avoiding complication, increase in size and cost of a mechanism. The invention of the present application provides a flat bag with a gusset and a zipper with a zipper that does not have creases on the front part and the rear part, and the extra width of the film that is cut off to align the edges is the same as the normal cut-off width. To do.

[0011]

According to the invention described in [Claim 1], a front surface portion, a rear surface portion, left and right side surface portions, and a lower surface portion are provided, each of which is composed of a separate packaging material section, and each joint portion is a joint. -Like heat seal ribs, the upper ends of the left and right side parts are separated from the upper ends of the front part and the rear part by a required dimension, and the inner surfaces of the front part and the rear part are located above the upper ends of the left and right side parts. A zipper is attached to the inner surface of the palm, and the edges of the front and rear surfaces form a heat-sealing rib, and the left and right side surfaces and the lower surface are inward between the front and rear surfaces. It is stored as a folded gusset body, and the bifurcated triangular ears that are folded and formed at the lower end of the side surface gusset body straddle the lower surface gusset, and the upper end of the side surface gusset body is closed, with a zipper A flat bag with gusset, which is a gusset body for the side part The bifurcated triangular ears formed by folding at the lower end consist of two flaps formed by folding the web in two and denting the ends of the fold line inward.One flap extends straight and the other flap folds. Is overlapped on either one of the front surface portion or the rear surface portion in the state of being opened by 90 degrees or more, and the foldable lower surface portion gusset body is overlapped on the one straight flap with the fold line inward. The other flap is folded and overlapped on the lower surface gusset body, and the other one of the front surface portion and the rear surface portion is overlapped, and the side edges and the lower edge of the front surface portion and the rear surface portion are heat-sealed. It is a flat bag with a gusset and a zipper. The invention described in [Claim 2] is
The inner surface is non-heat-sealing and the outer surface is heat-sealing.A web shorter than the required bag length is folded in half so that the inner surface is on the outer side, and the lower end of the fold line is further dented. Side flaps formed by folding up the forked triangular ears, in which the triangular flaps extend straight in a plane and the other triangular flap is kept open at an appropriate angle with respect to the one flap. Two fold-forming folds are formed symmetrically, and the two gusset-forming folds for the side surface are stacked on the left and right side edges of the inner surface having heat-sealing properties and point heat is applied at several points on the side edges. A gusset body for a lower surface part, which is formed by folding a web into two halves so that the inner surface having heat sealing property is on the outside on the left and right flaps that are straightened and extend in a straight plane. After stacking so that the fold lines face inward, fold the left and right flaps that were open above onto the gusset body for the lower surface part, and then lay the rear surface part on it and laterally seal on both side edges, lower edge A method for producing a flat bag with a gusset including a zipper, characterized in that a vertical heel is applied to the. The invention according to [Claim 3] has a front surface portion, a rear surface portion, and left and right side surface portions, and has a lower surface portion or a lower surface portion and an upper surface portion, each of which is configured by a different packaging material section, and each joint portion is a chisel shape. The left and right side surfaces and the lower surface section or the lower surface section and the upper surface section are respectively folded inward as a gusset body between the front section and the rear section. Bifurcated triangular ears formed by folding at the end of the body straddle the lower surface gusset body or the lower surface gusset body and the upper surface gusset body, or the lower surface gusset body or the lower surface gusset body and the upper surface A method for manufacturing a flat bag with a gusset with a zipper, in which a bifurcated triangular ear formed by folding at the end of the gusset body for parts straddles the gusset body for the side surface part, and the direction perpendicular to the continuous direction is the bag length. Direction and equal to bag length The first main packaging material having a continuous first main packaging material for forming one of the front surface portion and the rear surface portion is intermittently run at a bag width pitch with the inner surface having heat sealability facing upward. The second continuous main wrapping material having the same width as that of the other of the front surface portion and the rear surface portion is separated and intermittently transferred, and the first continuous main wrapping material and the second continuous main wrapping material are separated. In the main packaging material separation area to be transferred by transferring, one continuous packaging material is folded in two so that the inner side having heat sealability is on the outside, and the bottom surface gusset continuum for bottom part is folded in two. Inwardly, the first continuous main packaging material is overlaid on one side edge of the heat-sealable inner surface, and the second continuous main packaging material is placed on the bottom surface portion in the packaging material combination area on the downstream side of the main packaging material separation area. For gusset continuum for lower surface part The first continuous main packaging material is intermittently transferred so as to be overlapped, and outside the main packaging material separation area, a flat tube that is shorter than the bag length in which the inner surface is non-heat-sealing and the outer surface is heat-sealing is required. It is formed by denting both corners inward at the upper end of the flat tube and welding the entire inner folded portion as two bifurcated triangles, and denting both corners inward at the lower end of the flat tube. Make a gusset body for the side part of two adjacent bags by forming bifurcated triangular ears with two flaps, one of which extends straight and the other of which is open 90 degrees or more. When the intermittent running of the first main packaging material is stopped with respect to the first main packaging material, the side surface gusset body has a longitudinal direction with respect to the first main packaging material. One that is perpendicular to the longitudinal direction of the packaging material Facing each other and extending straight in the adjacent gusset body for the side portion of the two bags, aligning the apex of the flap with the end edge of the first main packaging material, and forming a bifurcated triangular ear of the folding body for forming the gusset for each side portion. Aligning the bifurcated base ends of the gusset continuum for the lower surface part with the two fold lines and stacking them at appropriate points corresponding to the bag joints with the first main packaging material by temporary welding. The gusset body for the side portion of the adjacent two bags is attached to the inner surface of the first main packaging material at a bag width pitch every time the intermittent transportation is stopped. The gusset-forming folds for the side portion temporarily attached to the material are sandwiched between the gusset continuum for the lower surface portion and the first main packaging material, and the gusset-forming fold for the side portion is formed. The other standing flag of the body Is laid down on the lower surface gusset continuum to ensure a state of being stacked so as to be sandwiched between the lower surface gusset continuum and the second main packaging material. In the packing material uniting area on the downstream side of the material separation area, horizontal heat sealing is applied to the part corresponding to the bag joint of the side surface gusset forming fold body, and it also corresponds to the bag joint part of the lower surface gusset continuous body Vertical lamination is applied to the parts to be welded, and the first continuous main wrapping material, the second continuous main wrapping material, the bottom part gusset continuum, and the side surface gusset forming fold body are welded and integrated into a continuous laminate. A method for producing a flat bag with a gusset having a zipper, wherein the continuous laminate is cut as required to obtain a flat bag with a gusset having a zipper.

[0012]

1 (a) is a schematic overall front view of a manufacturing apparatus for carrying out the method of manufacturing a flat bag with a zipper and a gusset according to the present invention. The manufacturing apparatus shown in FIG. 1 (a) can mass-produce the flat bag with a zipper and a gusset shown in FIG. 1 (b). FIG. 2 shows a manufacturing process diagram of a single bag of the flat bag P with a gusset and a zipper.

First, a method of manufacturing the flat bag P with a zipper and a gusset shown in FIG. 1 (b) as a single bag will be described. The flat bag P with a gusset having a zipper is substantially the same as the bag manufactured by the manufacturing method according to the second aspect.
FIG. 2 (f) shows the same flat bag P with gusset as that shown in FIG. 1 (b). As shown in FIG. 2 (a), this gusseted flat bag P with a zipper has a heat-sealable web F04 that is shorter than the bag length in which the inner surface is non-heat-sealable and the outer surface is heat-sealable. So that it is on the outside, fold it in half width and fold it so that the upper end of the fold line is recessed so that the two triangular flaps overlap, in this case, preferably the shape of the folding surface is an isosceles triangle. Rather than being an isosceles triangle, the folded surfaces are heat-sealed so that the flaps are not bifurcated, and the upper edges of the side face gusset bodies F4a are welded together to secure a welded seal in advance. , One of the flaps F4a 'extends straight in a flat shape by folding the bottom end of the fold line and the other flap F4a "is 90 relative to the one flap F4a'.
Two side surface gusset bodies F4a are formed symmetrically by folding up the bifurcated triangular ears that are opened more than 120 degrees, preferably 120 degrees to 140 degrees. Then, FIG. 2 (b)
As shown in, the upper surface of the front part F1a to which the male zipper strip G1 has been previously welded (inner surface having heat sealability)
The left and right side edges of the symmetric gusset body F4
A and F4a are piled up so that the lower edges are aligned, and point heat sealing is performed at several points on the side edges. Next, as shown in FIG. 2 (c), a bottom surface portion formed by folding the web in half width so that the inner surface having heat sealability is on the outer side on the left and right lower flaps F4a ', F4a'. The gusset body F3a is overlaid so that the fold line faces inward. Then, as shown in FIG. 2 (d), the left and right upper flaps F4a ", F4a" are folded over the gusset body F3a for the lower surface portion, and a point heat seal is performed so that the flaps F4a ", F4a" do not return. Give. Then, as shown in FIG. 2 (e), the rear surface portion F2a, to which the female zipper strip G2 has been welded in advance, is overlaid with the heat-sealable inner surface facing inward, and the side edge as shown in FIG. 2 (f). When the horizontal seal S1 and the vertical heel S2 are applied to the lower end, the bag making process is completed. The male zipper strip G1 and the female zipper strip G2 are engaged with each other after the objects to be packaged are accommodated. In addition, the male zipper strip G1 and the female zipper strip G2 are temporarily attached to the front surface portion F1a in a state of being meshed with each other, and after overlapping with the rear surface portion F2a, the male zipper strip G1 and the female zipper strip G2 are Each web may be welded to the front surface portion F1a and the rear surface portion F2a. In this case, in order to prevent the webs on both sides of the male zipper strip G1 and the female zipper strip G2 from being welded to each other, the melting points on the opposite surfaces of the webs are, for example, 20.
It is advisable to use a heat-sealable film having a temperature of 40 to 40 degrees higher, apply a part coat, or sandwich a separator. When inserting the separator, the vertical heel S2 must be applied later. Therefore, the flat bag P with a zipper and the gusset shown in FIG. 2 (f) is provided between the front surface portion F1a and the rear surface portion F2a.
The side surface and the lower surface are each folded inward as a foldable gusset body, and each joint portion is a gas-sealing heat seal rib, and is formed by folding at the lower end of the side surface gusset body F4a, F4a. Bifurcated triangular ear flap F4
a ', F4a "are in a state of straddling the lower surface gusset body F3a, and when opened, the bag becomes a square bottom or flat bottom bag. The bifurcated triangular ears at the upper end of the side surface gusset body F4a May be formed symmetrically with the bifurcated triangular ears at the lower end, but when formed as described above, the vertical heel is applied to the four side edges of the side face gusset body F4a, the front face portion F1a, and the rear face portion F2a. Since the side edge of the upper bifurcated triangular ear is not pinched when S2 is applied, the vertical heel S2 near the upper bifurcated triangular ear is strongly performed.
Therefore, it is possible to secure the sealing strength of the upper end of the side face gusset body F4a of the front face portion F1a and the rear face portion F2a, and further, when the bag is opened, the sealing ribs in which the folded surfaces forming the above-mentioned leafs do not project to the side of the bag. Can be

Next, a method of mass-producing the flat bag P with a zipper and a gusset shown in FIGS. 1 (b) and 2 (f) will be described with reference to FIGS.
This will be described with reference to FIGS. 4 and 5. This manufacturing method relates to a method for manufacturing the flat bag with a gusset having a zipper according to claim 3. Correspondences between the packaging materials in FIGS. 3 to 5 and FIG. 2 are F1 and F1a, F2 and F2a, F3 and F3a, F4.
And F4a, F4 ', F4 "and F4a', F4a" have corresponding relations. FIG. 3 is a perspective view of a main part of the manufacturing apparatus shown in FIG. FIG. 4 is a longitudinal cross-sectional view of an essential part as seen in the line downstream direction from the position where the side part gusset forming fold body F4 for forming the adjacent two bag side part corresponding to the side part gusset body F4a is attached. FIG. 5 is a perspective view for explaining a method of manufacturing a side body gusset forming fold body F4 for two adjacent bags corresponding to the side surface gusset body F4a shown in FIG. 2 (a).

As shown in FIG. 1 (a), the continuous main packaging material F01 fed from the first original roll R is fed by the film joining roll 1, the packaging material feeding drive roll 2 and the nip roll 3. Then, hang it on the dancer roll 4 and hang it on the turn bars 5 and 6 to change the main packaging material F01 from horizontal running to vertical running, then hang the main packaging material F01 on the guide roll 7 and then on the triangular plate former 8. The main packaging material F01 is folded in two and the main packaging material F01 is changed from vertical traveling to horizontal traveling. Then, the main packaging material F01 is passed through a pair of folding rolls 9 so that the heat-sealing inner surfaces of the main packaging material F01 are aligned with each other. The cutter 1 is passed through one of the packaging material intermittent transfer drive rolls 10 and then precisely aligned with the folding line of the main packaging material F01.
The main packaging material F01 is divided into a first continuous main packaging material F1 and a second continuous main packaging material F2 by cutting in the longitudinal direction at 1.

Next, the lower first continuous main packaging material F1
Is hung on the phase adjusting roll 12 and then horizontally run for a required distance, and the upper second continuous main packaging material F2 is hung on the guide roll 13 so as to be largely separated from the first continuous main packaging material F1. A main packaging material separation that horizontally travels and horizontally transports a return transportation section provided at the end portion in the opposite direction, and largely separates the first continuous main packaging material F1 and the second continuous main packaging material F2 vertically. Create area A.

Next, at a position where the main packaging material separation area A is finished, the first continuous main packaging material F1 and the second continuous main packaging material F2 that has passed through the return transport section are paired with the pair of rolls 14.
Then, the inner surfaces of the first continuous main packaging material F1 and the second continuous main packaging material F2 are overlapped with each other. Hereafter, the downstream side is referred to as a packaging material united area B.

Subsequently, in the packaging material uniting area B, the first continuous main packaging material F1 and the second continuous main packaging material F2 are
Between a pair of second intermittent transfer packaging material drive rolls 15, between horizontal heat sealers 17, between vertical heat sealer 18, and third drive roller 19 for intermittent transfer of packaging materials, respectively.
In between, it passes in order between the cutters 20. Then, the first to third packaging material intermittent transfer drive rolls 10, 15, 19
Are synchronously driven by servomotors (not shown), whereby the first continuous main packaging material F1 and the second continuous main packaging material F2 are intermittently run. As a line configuration, the vertical heat sealer 18 is the horizontal heat sealer 17
It may be provided before. Further, a plurality of horizontal heat sealers 17 and vertical heat sealers 18 may be provided in accordance with the intermittent feed pitch. A cooler for cooling the heat-sealed portion may be provided in combination with the horizontal heat sealer 17.

In the upstream part of the main packaging material separation area A, the male zipper strip G is attached to the zipper guide roll 32 which is close to the upper surface of the first continuous main packaging material F1.
1, the male zipper strip G1 is accurately guided to the required position near the opening on the upper surface of the first continuous main packaging material F1, and the male zipper heat sealer 21 is male when the packaging material is intermittently stopped. The web of zipper strip G1 is welded to the first continuous main packaging material F1. Thereafter, the male zipper strip G1 is transferred together with the first continuous main packaging material F1. Further, in the return transport section at the downstream side of the main packaging material separation area A, the female zipper strip G2 is hung on the zipper guide roll 33 which is close to the upper surface of the second continuous main packaging material F2. The mold zipper strip G1 is accurately guided to a required position near the opening on the upper surface of the second continuous main packaging material F2, and when the packaging material is intermittently stopped, the female zipper heat sealer 22 moves the web of the female zipper strip G2 to the second position. It is welded to the continuous main packaging material F2. After that,
The male zipper strip G1 is transported integrally with the second continuous main packaging material F2 and exactly faces the male zipper strip G1 when passing through the laminating roll 14, but in the packaging material coalescing area B, the laminating roll 14 In order to keep the bag opening in the bag, the first and second drive rolls 15 and 19 for intermittent transfer of packaging material need to be opened in order to accommodate the object to be packaged in the bag.
The male zipper strip G1 and the female zipper heat sealer 22 are not engaged with each other. Then, the point heat sealer 16 provided corresponding to the lateral sealing position and having a large clamping force is welded to the male zipper strip G1 and the female zipper heat sealer 22 in a state of being crushed by being meshed with each other.

As shown in the main packaging material separation area A of FIG. 1 (a) and in FIGS. 3 and 4, the main packaging material separation area A is provided above the corresponding edges of the first continuous main packaging material F1 so as to be adjustable in position. The continuous wrapping material F03 is applied to each of the triangular plate formers 23 and folded in two so that the inner surface having heat sealability is on the outside and the fold lines of the two folds face each other to form a gusset continuous body F3 for the lower surface portion. The lower surface gusset continuum F3 on both sides is hung on the guide roll 24, and then hung on the proximity guide roll 25 near the bag bottom side edge on the upper surface of the first continuous main wrapping material F1 to form the first continuous main wrapping material. F1
The gusset continuum for lower surface F3 is placed between the side edges of the first continuous main wrapping material F1 and the second continuous main wrapping material F2 by passing the gusset continuous body F3 between the first and second continuous main wrapping materials F1. It is designed to be transferred intermittently. The width dimension of the first continuous main packaging material F1 and the second continuous main packaging material F2 (X in FIG. 3)
Of the bag to be manufactured, and the feed pitch of the intermittent feed is taken to be equal to the width of the bag to be manufactured (the size of Y in FIG. 3). The continuous packaging material F03 is unrolled from a second original roll (not shown), hung on a film splicing roll (not shown) and a dancer roll (not shown), and hung on the triangular plate former 23. .

As shown in FIG. 3, a gusset-forming fold F4 for the side portion is formed outside (not limited to the side) of the main packaging material separation area A, and the side of the main packaging material separation area A is formed. The first continuous main packaging material F1 is transferred to the upper surface (inner surface) of the first continuous main packaging material F1, overlapped and fixed at a required position by welding. As shown in FIG. 4, a gusset forming folding body F4 for the side surface portion
Are superposed on the upper surface (inner surface) of the first continuous main packaging material F1 such that both end directions coincide with the direction perpendicular to the continuous direction of the first continuous main packaging material F1. Folding body F4 for forming gussets for the side portion is a triangular flap F of one leaf, which is formed by folding two corners inward at the upper end of a flat tube and folding and forming two triangular flaps.
4 "', and the bottom edge is formed by folding inward at both corners to form bifurcated triangular ears.
4'extends flat so as to be in close contact with the first continuous main packaging material F1 and the other flap F4 "is opened at an angle with the one flap F4 'in the range of 90 degrees to less than 180 degrees. It is kept in a state of standing upright, preferably in the range of 120 degrees to 140 degrees, and the triangular flap F4 "'is folded so as to form a triangle of the same size as the lower flap. Although the fold surfaces may not be welded to each other, it is preferable that the shape of the fold surfaces is not an isosceles triangle but a right triangle smaller than an isosceles triangle as described in the description of FIG. The flaps are folded and heat-sealed to each other so that the flaps are not bifurcated but one leaf, and a welded seal is secured in advance between the upper edges of the side face gusset bodies F4a, and the vertical heel S2 near the upper bifurcated triangular ears is Do strongly It is desirable that the seal ribs which fold faces serving as the Kazuha during the bag opening has palms together is prevented overhang toward the bag side.

FIG. 5 (c) shows a gusset-forming folded body F4 for the side surface. This side gusset forming fold F4
Is a non-heat-sealable inner surface and a heat-sealable outer surface, a flat tube having a length twice the bag length is made, and both corners are indented at both ends of the flat tube to form a bifurcated shape. Triangular ears F4 ', F4 "are formed to form a side surface portion for two adjacent bags. Specifically, as shown in Fig. 5, the inner surface fed from the original roll (not shown) has a non-heat-seal property. Packaging material F for forming a side surface part, which has a heat sealable outer surface
04 is hung on the former 31 and both edges are folded back so that the inner surface is on the outer side.
1 and a double-sided heat sealable laminated tape F05 through a pair of mating rolls 41 so as to cover the abutting points of the edges of the side face forming packaging material F04, and separate from the packaging material when intermittently stopped. Heat sealer for eyes 4
2 is rolled and heat-sealed to form a continuous flat tube. The flat tube is sent out, and is intermittently fed by a roll 34, sent out on a table 36 and cut by a cutter 35, and the length dimension is required to be shorter than the length of the bag to be manufactured and the width of the side surface of the bag. Make a flat tube F04 'having a width equal to Then, the flat tube F04 ′ on the table 36 is suction-held by the flat tube transfer means 37 equipped with a replaceable vacuum hand 37a corresponding to the shape of the flat tube F04 ′, and the flat tube F04 ′ is laterally placed on the table 38 in the horizontal position. To send. The vacuum hand 37a can suck and hold the flat tube F04 'with the main vacuum 37a' and the sub vacuum 37a "provided at both ends of the U-shaped frame. When the vacuum hand 37a positions the flat tube F04 'on the table 38, A vacuum means (not shown) attached to the lower surface of 38 sucks and holds portions of both ends of the flat tube F04 'corresponding to the bifurcated triangular ears to be formed, and near the bifurcated proximal ends of the bifurcated triangular ears. The pressing members 39, 39 press down the pressing members 39, 39 and the vacuum hand 37a without interfering with each other.The main vacuum 37a 'of the vacuum hand 37a is released and the sub-vacuum 37a "keeps vacuuming. When 37a goes up and reaches the required dimension, for example, about 15 mm, The vacuum 37a "releases the vacuum, and the vacuum hand 37a subsequently retreats. The sub-vacuum 37a" keeps vacuuming, and the vacuum hand 37a rises up. Both ends of F04 'are sucked from the upper and lower surfaces, so that both ends are opened. From the time before the sub-vacuum 37a "releases the vacuum, each pair of the ear forming plates 40 on both sides closes along the end faces of the pressing members 39, 39 to horizontally extend the protruding portion of the tube. The folds F4 for forming side face gussets are formed by folding the triangular flaps F4 'and the upper triangular flaps F4 "that are inclined by 90 degrees or more and stand upright to form bifurcated triangular ears. Next, when the vacuum handling means 26 shown in FIGS. 1A and 3 sucks and holds the side face gusset forming folded body F4 on the table 38, the table 3
The vacuum means (not shown) attached to the lower surface of 8 releases the suction, and the pressing members 39, 39 rise to release the pressing. This side gusset forming fold F4
Is for the side surface for two adjacent bags, and when divided in two in the width direction,
As shown in FIG. 3, two side face gusset forming folds F4a shown in FIG. 2 can be produced. The side face gusset forming folded body F4 can be used if there is an inflation tube formed by coextrusion having an inner surface having a non-heat-sealing property and an inner surface having a non-heat-sealing property and having the same dimensions. .

Returning to FIG. 3, the description will be continued. The vacuum-type handling means 26 transfers the side-portion gusset-forming folds F4 formed outside the main packaging material separation area A to the upper surface of the first continuous main packaging material F1. The wrapping ability in the manufacturing method of the present invention is that the gusset-forming folded body F4 for the side surface portion, which has the bifurcated triangular ears F4 ', F4 "formed at both ends, is formed on the upper surface of the first continuous main packaging material F1 in one minute. In order to enhance the packing capacity, the side gusset forming folds F4 are alternately supplied to the upper surface of the first continuous main wrapping material F1 to be mounted. It is preferable.
The vacuum handling means 26 has a vacuum box 26a that can be replaced according to the shape of the side face gusset forming fold F4 to be conveyed, and the vacuum box 26a can be used to replace the side face gusset forming fold F4. The first continuous main wrapping material F1 is a flap F4 'which is flattened by widely holding the middle of the upper surface avoiding the triangular flap F4 "' and the flaps F4 'and F4" forming the bifurcated triangular ear. First continuous main packaging material F1 to match the edge of
It is designed to be stacked on the upper surface of. The lower surface of the first continuous main packaging material F1 in the main packaging material separation area A is received by the anvil plate 27. First continuous main packaging material F1
When the side face gusset forming folds F4 are stacked on the upper surface of the, the left and right point heat sealers 28 perform point heat sealing at the center of the triangular flaps F4 "'and flaps F4' on both sides. The heat seal is for temporarily fixing and welding the side face gusset-forming folded body F4 to the first main packaging material F1 and can be applied at an appropriate position corresponding to the bag joint portion. At the moment the point heat seal is performed, 26 releases the vacuum and returns so as not to interfere with the point heat sealer 28, and shifts to the operation of sucking and holding the next side face gusset forming folded body F4. The gusset-forming folding body F4 for the side surface is attached to the upper surface of the first continuous main packaging material F1 every time the intermittent transfer of the packaging material is stopped. Therefore, the first continuous main packaging material F1 is formed at a pitch equal to the width dimension of the bag to be manufactured by the side-portion gusset forming folded body F4.
Mounted on. Vacuum handling means 26
Can suck and hold the upper surface of the side face gusset forming folded body F4, so that the side face gusset forming folded body F4 can be held.
It is advantageous to adhere the lower surface of the above to the upper surface of the first continuous main packaging material F1. However, the transportation of the side-portion gusset-forming folded body F4 is not limited to the vacuum handling means 26. Other gripping transfer means may be used.

The side face gusset forming fold F4 temporarily welded to the upper surface of the first continuous main packaging material F1 reaches the lower position corresponding to the proximity guide roll 25 by the subsequent intermittent transfer of the packaging material. To do. The flatly extended flap F4 'moves so as to be stepped on by the proximity guide roll 25, and is sandwiched below the lower surface gusset continuum F3. At this time, if the centers of the flaps F4 'on both sides are temporarily fixed and welded to the first continuous main packaging material F1, there is no risk of displacement.

The other standing flap F4 "is in a state of being opened at an appropriate angle within the range of 90 degrees or more and less than 180 degrees with the flap F4 ', preferably 120 to 140 degrees. In addition, the forked base end of the bifurcated triangular ear is aligned with the fold line of the lower surface gusset continuum F3 and can pass without interfering with the proximity guide roll 25. It is more preferable that the flap F4 ″ is guided by a guide rail (not shown) to be inclined upright at about 120 ° to 140 ° and intermittently moved until reaching the proximity guide roll 25.

The standing flaps F4 "that have passed without avoiding the interference with the proximity guide rolls 25 are pushed down by the pushing-down guides 29 in the process of being intermittently fed by several steps, and are folded down onto the gusset continuum F3 for the lower surface portion. At this time,
The forked base of the bifurcated triangular ear is a gusset continuum for lower surface F3
The flap F4 "is folded from the forked base end and is smoothly laid on the gusset continuum for lower surface F3. Then, the point heat sealer 30 is folded on both sides. A point heat seal is applied to the center of the flap F4 ". This point heat seal is
The flap F4 "is temporarily welded to the bottom face gusset continuum F3. The side face gusset forming fold F4 is thus composed of two flaps F4 ', F4 that are bifurcated triangular ears. "" Is secured across the bottom surface gusset continuum F3, and the two-pronged base ends of the flaps F4 ', F4 "are secured in a state where they are aligned with the folding lines of the bottom surface gusset continuum F3. It should be noted that there may be a very small gap, for example, a gap of 1 mm, between the forked base ends of the flaps F4 ', F4 "and the folding line for folding the bottom face gusset continuum F3. The push-down guide 29 is the most advantageous means because it does not operate and is inexpensive. But the standing flap F4 "
The means for folding the bottom part of the gusset continuum for lower surface F3 is
It is not limited to the push-down guide 29. For example, the flap F4 ″ that has been erected by the rocking lever may be pushed down. The flap F may be pushed against the gusset continuum F3 for the lower surface portion.
Folding 4 "and temporarily welding is performed every time when the intermittent transfer of the packaging material is stopped. When the push-down guide 29 is extended to the close distance of the roll 14, the flap is provided. The F4 "is folded over the gusset continuum for lower surface F3, and is sandwiched between the matching rolls 14 and covered with the second main packaging material F2. Therefore, the point heat sealer 30 applies a point heat seal to the center of the flap F4". Applying can be omitted.

Then, in the packaging material uniting area B, that is, in the section from the above-mentioned joining roll 14 to the cutter 20, a portion corresponding to the bag joint portion of the side face gusset forming folded body F4 by the horizontal heat sealer 17,
That is, a horizontal heat seal S1 is applied to a portion corresponding to the entire length in the width center, and a portion corresponding to the bag joint portion of the lower surface gusset continuum F3 by the vertical heat sealer 18, that is, the first continuous main packaging material F1. And longitudinal heat seal S2 is applied to the edge of the second continuous main packaging material F2, and the first continuous main packaging material F1, the second continuous main packaging material F2, the lower surface gusset continuum F3, and the side surface portion. A gusset-forming folded body F4 is welded and integrated into a continuous laminated body. Then, for the continuous laminated body, a third packaging material intermittent transfer drive roll 1
After passing 9, the horizontal heat seal S is made by the cutter 20.
When the cut C is made from the center of the seal width of 1, a flat bag P with a zipper and a gusset can be manufactured as shown in FIG.
Folding body F4 for forming gusset bodies for two adjacent bags
2 is subjected to a transverse heat seal S1 through the center of the width, the center of the upper triangular flap F4 "'and the center of the lower bifurcated triangular ear, and is bisected by the cutter 20. ), The left and right side surface gusset bodies of the flat bag P with zipper and gusset are formed, and the lower bifurcated triangular ears of the side surface gusset body straddle the lower surface gusset body. The manufacturing apparatus shown in Fig. 1 (a), Fig. 3, Fig. 4 and Fig. 5 can mass-produce the flat bags P with gussets with zipper shown in Fig. 2 in a line. The point heat sealer 16 shown is not shown for convenience of drawing.The horizontal heat seal S1 serves as a side heat seal at the joint portion of the bag, and the vertical heat seal S2.
Is a bottom heat seal.

FIG. 6 is a process drawing of the flat bag with zipper and gusset of the present invention to open the baggage, accommodate the article to be packaged, and apply the top seal to form a packaged body. As shown in FIG. 6 (a), the flat bag P with a gusset with a zipper is placed in a state in which the zipper strips G1 and G2 are disengaged, and two front and rear vacuum pads 43, 43, 44 and 44 are attached to the front portion. When F1a and the rear face portion F2a are sucked and separated from each other in parallel, as shown in FIG. 6 (b), the right side face portion and the left side face portion, which have been folded into the side gussets, develop into a single plane, and the front face portion F1a The rear surface portion F2a and the left and right side surface portions are joined together by a heat seal rib S1 having a palm-like shape, and the bottom surface portion is flatly developed into a quadrangle to form a flat bottom. The lower edge portion is opened into a rectangular parallelepiped shape which is joined by a heat-sealing rib S2 having a palm shape. Next, after accommodating a packaged product (not shown) from the upper end opening, as shown in FIG. 6 (c), the vacuum of the large vacuum pads 42, 42 on the lower side is continuously maintained and the small vacuum pads 41, 41 on the upper side are maintained. Of the zipper strips G1 and G2 are engaged with each other, and then the top heat sealers 45 and 45 apply a top seal to the top edges to form a package. The zipper strips G1 and G2 are meshed with each other by closing the vacuum pads 41 and 41 and applying top seal with the top heat sealers 45 and 45, and then opening the vacuum pads 41 and 41 and a pair of unillustrated ironing rolls from the side. Alternatively, the zipper strips G1 and G2 may be sandwiched from both sides and reciprocated once.

Regarding the packaging material, the first continuous main packaging material and the second continuous main packaging material for forming the front surface portion F1 and the rear surface portion F2 are in a state in which the outer surface side is closely attached in a palm shape in the bag making process. In addition, since the outer surface side is not adhered to another packaging material, it is sufficient if at least the joint portion at the peripheral edge on the inner surface side has a sheet sealing property. However, since the front surface portion F1 and the rear surface portion F2 are not folded inward in the bag making process and the outer surface side is not adhered to each other, the first continuous main packaging material and the second continuous main packaging material are It is not excluded to use a three-layer coextrusion lamination laminated film having sealant films on both sides or an unstretched single film having heat sealability. The left and right side surfaces, the lower surface gusset continuum F3 for forming the lower surface or the lower surface and the upper surface, and the side surface gusset forming fold F4 are folded inward in the bag-making process into two outer surfaces. It is a member that is heat-sealed by folding side gussets in which the sides are in close contact with each other, and since the outer surfaces must not be adhered to each other, the outer surfaces have no heat-sealing property,
It is sufficient if at least the joint portion on the inner surface side is a packaging material having a sheet sealing property. Front part F1, rear part F2, bottom part gusset continuum F3, and side part gusset forming fold F4
Is, for example, OPP, PET, biaxially stretched film vapor-deposited with silica or alumina, aluminum foil, paper and the like on the outer surface side, with or without an inner layer is free, CP on the inner surface side
It is preferable to use a laminated packaging material obtained by laminating sealant films such as P, PE, LLDPE, and HDPE. Also, CP on the inner surface
You may laminate the nonwoven fabric which consists of P or PE. Further, the front surface portion, the rear surface portion, the right side surface portion, the left side surface portion and the lower surface portion are aluminum foils each having an outer surface and / or an inner surface laminated with a biaxially stretched film,
Alternatively, a heat-welding adhesive may be applied to the peripheral edge of the inner surface of the packaging material such as paper. The peripheral edge is a portion corresponding to the heat seal rib. Depending on the use of the bag,
A biodegradable plastic film having an inner surface having heat sealability can be used as a packaging material. There may be a case such as a packaging bag or a shopping bag which may be made of a large mesh material. Regarding what kind of packaging material can be used,
For example, JP 7-314587 A, JP 9-216638 A, JP 20
The packaging materials used for the bags of 00-153849, JP 2001-48194 A, and JP 2001-206385 A can be used as they are.

Specifically, the packaging materials listed in [0014], [0015] and [0016] of the specification of Japanese Patent Laid-Open No. 2000-153849 can be entirely applied. The following description is JP 2000-153A.
It is a reprint from the specification of No. 849 (the code is deleted).
The following are specific examples of the constitution of the composite film which can be preferably used in common on any surface forming the flat-bottomed bag of the present invention. (1) 0N / AD / L LDPE (#) (2) ON / AC / (HDPE / LLDPE) (#) (3) ON ・ SiOX / AC / (HDPE / LLDPE) (#) (4) PET / AD / AL / AD / ON / AD / LLDPE (#) (5) PET / AD / AL / AD / ON / AD / S-PE (#) (6) PET / AD / AL / AD / ON / AD / CPP (#) (7) PET / AD / ON / AD / AL / AD / LLDPE (#) (8) PET / AD / ON / AD / AL / AD / S-PE (#) (9) PET / AD / ON / AD / AL / AD / CPP (#) (10) PET / AD / EVOH / AD / ON / AD / CPP (#) (11) ON / AD / O-HDPE / AD / LLDPE (#) (12 ) ON / AD / O-PP / AD / LLDPE (#) Although the above material configuration examples are described by abbreviations, the abbreviations indicate the following materials or layers, respectively. ON: Biaxially oriented nylon film, AD: Adhesive, LLDPE:
Linear low density polyethylene, AL: Aluminum foil, O-HDPE:
High density polyethylene uniaxially stretched film, LDPE: low density polyethylene, O-PP: polypropylene uniaxially stretched film, S-PE: ethylene-α / olefin copolymer polymerized using a metallocene catalyst, PET: biaxial Stretched polyester film, CPP: Unstretched polypropylene film, SiOX
: Silica, AC: Anchor coat, EVOH: Saponified ethylene / vinyl acetate copolymer, and () indicates coextrusion. The anchor coat is a kind of primer coat that is pre-coated on the substrate film side in order to improve adhesiveness when laminating a resin by extrusion coating. Then, the aluminum foil, the silica vapor deposition layer, the EVOH film and the like are laminated in order to impart a gas barrier property. Further, the uniaxially stretched HDPE film or the uniaxially stretched P film used for the composite film is a method in which the opening of the bag at the film spout is torn at the spout, and the stretching direction is the tearing direction when the bag is opened. The direction of the tear can be further stabilized by using it so as to match with.
Two examples of LLDPE film and CPP film were given as the heat-sealing layer. LLDPE film is excellent in heat seal stability and content resistance, for example, stress cracking resistance against surfactant. , CP films have excellent heat resistance and low odor, and are suitable for packaging contents that require these properties. In addition to the above, the heat-sealing layer may have an ethylene / vinyl acetate copolymer, an ethylene / acrylic acid copolymer, an ethylene / acrylic acid ester copolymer, an ionomer, a polyester resin, or a metallocene depending on the contents to be filled. An ethylene-α / olefin copolymer polymerized using a system catalyst can also be appropriately selected and used.

As a modified example of the entire line shown in FIG. 1 (a), the present invention is a first continuous main before the main packaging material F01 is vertically run and guided to an M plate (not shown) to be applied to the M plate. The packaging material F1 and the second continuous main packaging material F2 are divided and the first continuous main packaging material F1 is horizontally run downward by the M plate and the second continuous main packaging material F2 is horizontally run upward. The first continuous main wrapping material F1 and the second continuous main wrapping material F2 may be hung on different dancer rolls. The flat bag with zipper and gusset manufactured by the manufacturing method of the present invention is suitable for a packaging bag for powders, lumps and the like, and also provides a new mass production method. The present invention is characterized in that the short left and right side surfaces and the lower surface are gusset-folded to fit between the front surface and the rear surface, and that the inner surface near the opening is equipped with a zipper. Is proposed. In a bag that does not need to ensure hermeticity, the heat-sealing points do not have to be continuous. In rice bags and the like, heat sealing is intermittent to evacuate air in order to avoid bag breakage.

[0032]

As described above, the gusseted flat bag with zipper and the manufacturing method of the present invention have the following effects. (1) The present invention includes a front surface portion, a rear surface portion, left and right side surface portions, and a lower surface portion which is composed of five packaging material sections, and the joint portion is joined by a heat seal rib having a palm-shape between the front surface portion and the rear surface portion. It is possible to provide a flat bag with a gusset having a zipper, in which the left and right side surfaces and a lower surface are folded inward as a gusset body, and a zipper is provided at the bag opening, and a manufacturing method thereof. In particular, the upper end of the side part gusset body is located below the male and female meshing parts of the zipper, and the upper end of the side part gusset body is sufficiently sealed and heat-sealed. It is possible to provide an extremely advantageous manufacturing method which can be commonly applied to a plurality of types of flat bags with a zipper and a gusset, which are easy to manufacture and have a square bottom and a flat bottom when the bag is opened. (2) The present invention is a gusset with a zipper that can easily and satisfactorily seal the upper end of the inner surface of the side surface gusset body and has good tear-tight strength at the joint of the upper end of the inner surface of the side surface gusset body. It is possible to provide an attached flat bag and a manufacturing method thereof. (3) The present invention makes it possible to assemble the overlapping portion of the gusset body for the side surface portion and the gusset body for the lower surface portion, which is stored between the front surface portion and the rear surface portion, very easily and extremely accurately in a very short time. It is possible to provide a flat bag with a gusset having a zipper and a method for manufacturing the same, which are highly producible. (4) The present invention can easily incorporate the overlapping portion of the gusset body for the side surface portion and the gusset body for the lower surface portion simply by adding a simple device to the manufacturing device for the flat bag with the gusset with the zipper of the popular type, You don't have to spend a lot of money on new development, and you can easily modify the existing machine that is actually in use.You can avoid complication, large size, and high price of the mechanism of the entire device, and simplify the device. It is possible to provide an extremely advantageous manufacturing method that greatly contributes to mass production and mass productivity. (5) The invention of the present application can provide an extremely advantageous manufacturing method because the extra width of the film to be cut off to align the edges is the same as the normal cutoff width. On the other hand, in the invention of Japanese Patent Laid-Open No. 2001-158057, the packaging material is used uneconomically because the cut-off width needs to be set extremely large, so the present invention is more advantageous. (6) The present invention can provide a very advantageous manufacturing method in which neither the front surface portion nor the rear surface portion has a crease during manufacturing. On the other hand, in the invention of Japanese Patent Laid-Open No. 2001-158057, there is a problem that a crease due to rolling up remains on either the front surface portion or the rear surface portion, so the present invention is more advantageous. (7) Since the invention of the present application has no creases on either the front surface portion or the rear surface portion, the shape retaining property, the standing property, and the appearance property are good.

[Brief description of drawings]

FIG. 1 (a) is a schematic front view of a manufacturing apparatus for carrying out the method for manufacturing a flat bag with a zipper and a gusset according to the present invention. FIG. 1B is a perspective view of a gusseted flat bag with a zipper that is mass-produced by the manufacturing apparatus of FIG. 1A.

FIG. 2 shows a manufacturing process diagram of a flat bag with a gusset having a zipper according to the present invention as a single bag.

FIG. 3 is a perspective view of a main part of the manufacturing apparatus shown in FIG.

FIG. 4 is a longitudinal cross-sectional view of a main part as seen in a line downstream direction from a position where the side surface gusset forming folding body for two adjacent bags corresponding to the side surface gusset body is attached.

FIG. 5 is a perspective view for explaining a method of manufacturing a side surface gusset forming fold body for two adjacent bags corresponding to the side surface gusset body shown in FIG. 2 (a).

FIG. 6 is a process diagram of opening a flat bag with a gusset and a zipper according to the present invention to accommodate an article to be packaged and apply a top seal to form a package.

[Explanation of symbols]

P: Flat bag with gusset with zipper, F1a: Front part, F2a: Rear part, F3a: Lower part gusset body, F04
... Web, F4a, F4a ... Side gusset body, F4a ',
F4a "... Flap / trifurcated triangular ears, F4"'... Triangular flap, R ... First material roll, F01 ... Continuous main packaging material, 1 ... Film splicing roll, 2 ... drive roll for feeding packaging material, 3 ... nip roll, 4 ... dancer roll, 5, 6 ... turn bar, 7 ... guide roll, 8 ...
・ Triangle plate former, 9 ... Folding roll, 10 ...
Drive roll for intermittent transfer of first packaging material, 11 ... Cutter, F1 ... First continuous main packaging material, F2 ... Second continuous main packaging material, F03 ... Continuous packaging material, F3・ ・ ・ Bottom gusset continuum, F04 ・ ・ ・ Side part structuring packaging, F4 ・ ・ ・ Side part gusset forming folds, F4 ′, F4 ″ ・ ・ ・ Forked triangular ears, 1
2 ... Phase adjusting roll, 13 ... Guide roll, A ... Main packaging material separating area, 14 ... Laminating roll, B ... Packaging material uniting area, 15 ... Second packaging material Intermittent transfer drive roll, 16 ... Point heat sealer, 17 ... Horizontal heat sealer, 18 ... Vertical heat sealer, 19 ... Third packaging material intermittent transfer drive roll, 20 ... Cutter Two
1 ... Male zipper heat sealer, 22 ... Female zipper heat sealer, 24 ... Guide roll, 25 ...
Proximity guide roll, 26 ... Vacuum handling means, 26a ... Vacuum hand, 27 ... Anvil plate, 28 ... Point heat sealer, 29 ... Push down guide 29, 30 ... Point heat sealer , 31 ...
Former, F05 ... Laminated tape for stitching, 32, 33
..Zipper guide rolls, 34 ... delivery rolls, 3
5 ... Cutter, 36 ... Table, F04 '... Flat tube, 37a ... Vacuum hand, 37 ... Flat tube transfer means, 37a' ... Main vacuum, 37a "... Sub Vacuum, 38 ... Table, 39 ... Pressing member, 4
0 ... Ear forming plate, 41 ... Laminating roll, 42 ... Heat sealer for sealing, S1 ... Horizontal heat seal, S2 ... Vertical heat seal, C ... Cut, 43, 44 ... ..Vacuum pads, 45 ... top heat sealer, G1 ... male zipper strip, G2 ... female zipper strip,

[Procedure amendment]

[Submission date] April 18, 2002 (2002.4.1)
8)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Title of invention

[Correction method] Change

[Correction content]

Title: Flat bag with gusset with zipper and method of manufacturing the same

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B31B 37/20 B31B 37/20 37/40 37/40 37/64 37/64 37/90 37/90 B65D 30/20 B65D 30/20 A

Claims (3)

[Claims] 1. A front surface portion, a rear surface portion, left and right side surfaces, and a lower surface portion are constituted by different packaging material sections, and each joint portion is a palm-shaped heat seal rib, and upper ends of the left and right side portions are formed. It is separated from the upper ends of the front and rear parts by the required size, and at a position above the left and right side parts, zipper is attached to the inner surfaces of the front and rear parts and the edges of the front and rear parts are shaped like a palm. It is a heat-seal rib, and the left and right side surfaces and the lower surface are folded inward between the front surface and the rear surface as a foldable gusset body, and the bifurcated folds are formed at the lower end of the side surface gusset body. -Shaped triangular ears straddle the lower surface gusset, and the upper edges of the side surface gussets are hermetically welded to each other. Bifurcated triangular ears fold the web in two It is composed of two flaps that are formed by denting the ends of the fold line inwardly and one of the flaps extends straight and the other flap opens at the required angle, either the front surface or the rear surface. The gusset body for the lower surface part, which is folded in half and is folded in two, is overlapped on the straight flap that extends straight with the fold line inward, and the other flap is folded down and the gusset body for the lower surface part is folded over. The gusset flat bag with a zipper, characterized in that the front side and the rear side are overlapped with each other, and the side edges and the lower edge of the front side and the rear side are heat-sealed. 2. A method in which a web having a non-heat-sealing inner surface and a heat-sealing outer surface and having a required length shorter than the bag length is folded in half so that the inner surface is on the outer side, and the upper edges are further appropriately arranged. Sealing and welding at the same time and folding so that the lower end of the fold line is recessed so that the lower end of the fold line is recessed and one triangular flap extends straight in a planar shape and the other triangular flap is the one flap. With respect to the gusset forming folds for the side part, which are formed by folding up the bifurcated triangular ears with the required angle opened, two symmetrical folds for forming the gusset for the side part are formed, Point heat seals are applied to the left and right side edges of the inner surface having heat sealability at several points on the side edges, and heat seals are applied on the left and right flaps that extend straight in a plane. After stacking the lower surface gusset body, which is formed by folding the web into two half widths so that the inner surface of the lower surface gusset has the open left and right flaps. A method for producing a flat bag with a gusset, which is characterized in that it is folded over the body, the rear surface portion is overlaid on it, and lateral seals are applied to both side edges, and vertical heels are applied to the lower edge. 3. A front surface portion, a rear surface portion, left and right side surface portions and a lower surface portion are formed of different packaging material sections, and each joint portion is a palm-shaped heat seal rib, and upper ends of the left and right side surface portions are formed. It is a required distance from the upper ends of the front and rear parts, and a zipper is attached to the inner surfaces of the front and rear parts at a position above the left and right side parts, and the edges of the front and rear parts are shaped like a palm. It is a heat seal rib, and the left and right side surfaces and the lower surface are folded inward between the front and rear surfaces as a foldable gusset body, and the bifurcated folds are formed at the lower end of the side surface gusset body. -Shaped triangular ears straddle the lower surface gusset, and the upper edges of the side surface gussets are hermetically welded to each other. Width in the length direction and equal to the bag length The first main packaging material having a continuous first main packaging material for forming one of the front surface portion and the rear surface portion is intermittently run at a bag width pitch with the inner surface having heat sealability facing upward. The second continuous main packaging material for forming the other of the front surface portion and the rear surface portion is separated and intermittently transferred, and the first continuous main packaging material and the second continuous main packaging material are separated. In the main packaging material separation area to be transferred by transferring, one continuous packaging material is folded in two so that the inner side having heat sealability is on the outside, and the bottom surface gusset continuum for bottom part is folded in two. Overlaid on one side edge of the heat-sealable inner surface of the first continuous main packaging material inwardly, the second continuous main packaging material is placed on the bottom surface portion in the packaging material coalescing area on the downstream side of the main packaging material separation area. For gusset continuum for lower surface part The first continuous main packaging material is intermittently transferred in an overlapped manner, and outside the main packaging material separation area, the length dimension is required shorter than the bag length, the inner surface is non-heat sealable and the outer surface is heat sealable. A flat tube is formed and both corners are inwardly recessed at the upper end of the flat tube to form the bifurcated triangular ears in an overlapping state, and at the same time, the lower end of the flat tube is indented at both corners. Side flaps for two adjacent bags made of two bifurcated side gussets, each of which is made up of two flaps and one flap extends straight and the other flap opens at the required angle. The partial gusset body to the first main packaging material, and when the intermittent running of the first main packaging material is stopped, the longitudinal direction of the adjacent two-bag side surface gusset body is the first main packaging material. In a direction perpendicular to the longitudinal direction of Further, the bifurcated bases of the bifurcated triangular ears of the foldable body for forming side face gussets are arranged so that the vertices of the flaps extend straight to the side face gusset body for adjacent two bags and are aligned with the edges of the first main packaging material. Intermittent transfer of packaging material by stacking with the end aligned with the fold line of the gusset continuum for lower surface and applying temporary fixing welding to the first main packaging material at an appropriate location corresponding to the bag joint. The gusset body for the side part of the adjacent two bags is attached to the inner surface of the first main packaging material at a bag width pitch, and is temporarily transferred to the first main packaging material by intermittent transfer of the packaging material. The flattened flap of the worn gusset-forming fold body for the side surface part is sandwiched between the gusset continuum for the lower surface part and the first main packaging material, and In front of the other flap that is standing up The gusset continuum for the lower surface part is laid down so as to ensure a state of being stacked so that the gusset continuum for the lower surface part is sandwiched between the second main packaging material and the main packaging material separation. In the packaging material uniting area on the downstream side of the area, horizontal heat sealing is applied to the portion corresponding to the bag joint of the side face gusset forming fold body, and the portion corresponding to the bag joint of the lower surface gusset continuum. Vertical heat sealing is applied to the first continuous main wrapping material, the second continuous main wrapping material, the lower surface gusset continuum, and the side surface gusset forming fold to form a continuous laminated body. A method for producing a flat bag with a gusset having a zipper, wherein the continuous laminated body is cut as required to obtain a flat bag with a gusset having a zipper.