JPH0620886B2 - Square tubular bottom bag and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology is automatic filling of products such as potato chips made from a synthetic resin film whose inner surface is heat-welding as a material sheet. It belongs to the technical field of manufacturing a square-bottomed rectangular bag used for packaging.

<Summary of Summary> Thus, the invention of this application is such that a vertical seal is formed on the side surface by a sheet of a composite packaging film whose inner surface is heat-welding and whose outer surface is treated to have low gas permeability, etc. It is a square tubular bottomed bag with a flat cross-section in the shape of a square tube, into which products such as potato chips are sealed and filled, the upper bottom of which is chevron-shaped and the lower bottom is flat-bottomed. There is an inner bottom composed of a sheet part formed into a triangular shape by bending from the left and right sides to the inside when viewed from the longitudinal direction inside the bag and a sheet part formed by bending from the front side to the inside and the bag Similarly, the outer bottom and the outer bottom composed of a rectangular sheet portion are bent and integrated from the front and back sides when viewed in the longitudinal direction as seen from the longitudinal direction, and are integrated by fusion to form a quadruple layer of the outer bottom of the corner bottom. Folded lateral seal part of the seat Is an invention relating to a rectangular tubular bottom bag in which a folded portion of a triple-layer sheet of the inner bottom is polymerized, and a method for producing the same, and in particular, each of the four-layer sheets of the outer bottom of the lower bottom and the inner bottom. Of the seven-layered sheet formed by the three-layered sheets, the inner bottom corner of the inner bottom of the bag that stores the products is the outermost corner of the innermost bottom of the innermost layer, and the third bottom is the outer corner of the bag. The two sheets from the outermost layer sheet on the inner bottom of the sheet are opposed to each other through the opening holes such as round holes and square holes formed at the opposite positions where the opening holes are not provided. The inner surfaces of the sheets are heat-welded together, the outer bottom of the horizontal seal is also heat-welded integrally with the inner bottom, and the backing piece sheet, which is also made of a sheet with the inner surface heat-welded, adheres to the back surface of the innermost layer sheet. Inner layer sheet out of at least seven layer sheet All of the sheets between the backing piece sheet and the outermost layer sheet are welded to the corner bottom portion by heat welding through the opening holes formed in the second sheet from the outermost layer at opposite positions. The invention relates to a rectangular tubular outer bottom bag in which the square bottom portion is surely formed in a good sitting condition, and a manufacturing method thereof.

<Prior Art> As is well known, many products are distributed in the secondary market in a packaged form, but among them, for example, beverage products such as coffee and tea, snack products such as potato chips, or, Products such as confectionery are widely used in the form of being packaged in a sealed form and easily handled because of their hygiene and small unit shape.

And, the packaging material used for such bagging is the deterioration of quality due to moisture absorption and the prevention of oxidation of the packaged product over time due to oxygen permeation
Alternatively, it is necessary to have airtightness to dislike chemical changes due to ultraviolet rays, and also because the packaging material itself is harmless to the human body in terms of sanitary restrictions, and simple for folding and sealing. From the aspect of adopting the means of heat welding, a composite material of inner and outer double layers is used, and in some cases, a composite material of five layers or the like in which three intermediate layers are sandwiched between them is used. As the material, a synthetic resin film sheet such as paper, aluminum foil, cellophane, polypropylene or the like, and further a composite film sheet obtained by subjecting this to aluminum vapor deposition are used.

And, laminating means etc. for performing heat welding to the horizontal seal etc. of the bent part are also used, and the product name, specifications, manufacturing date, characteristics, and also colorful design for advertising etc. on the surface. It is printed.

In general, when packaging a product, there is a mode in which one bag or a small amount of bag is originally purchased from a manufacturer specialized in bag manufacturing, but as described above, with the expansion of the secondary market in recent years. In the backyard of supermarkets, etc., a large number of bags of the same size are often used, and it is possible to purchase roll-shaped units with the above-mentioned packaging materials such as film sheets printed as specified. A case has been taken in which it is mounted on a packaging device and a film sheet is automatically fed out to form a bag, or goods are filled simultaneously with the bag formation.

Thus, for snack products, confectionery, etc., the film-like sheet fed from the unit roll is formed into a cylindrical shape by the former of the packaging device and the forming cylinder connected to the former, and the vertical seal is heat-welded. After the process, the upper part is laterally sealed, the bottom part is further sealed, the snack product and the like are also filled inside, and the upper part is laterally sealed and cut for each bag.

A packaged product by such packaging is a so-called pillow type, and its shape is formed into a pillow shape as the word says, and the packaging device is also a simple packaging machine main body equipped with a vertical seal, a horizontal seal, and a cutting mechanism. Because it only has
It has been widely used because it has a simple device, can manufacture packaged goods at low cost, is easy to operate, requires almost no management, and requires little maintenance and inspection.

As mentioned above, since the packaged products are pillow-shaped, as described above, the packaged products are to be transported to a store after manufacturing, or
A certain number of items are stored in a cardboard box or the like to be stocked in a warehouse or the like, but due to the pillow-like shape as described above, the mutual space is largely occupied as a dead space, and the storage attitude is It is difficult to set up neatly, and it requires considerable skill to store it.Therefore, there is a drawback that the number of pieces that can be stored in a cardboard box is limited, and the state displayed on shelves etc. in stores etc. is more than the vertical shape. The horizontal shape is good, so the printing and handling instructions used on many areas of the surface are difficult for the purchaser to see, and there is also the problem that inventory management such as extraction check is also impossible. It was

Due to such problems as the number of pieces to be stored in a cardboard box and the like during transportation and stocking, and the problem of the arrangement of products in a display form on a display shelf, a packaging machine similar to the conventional mode is used. The so-called gusset type square bottom bag with a mountain-shaped top bottom and a flat bottom bottom that can be manufactured by the above-mentioned rectangular cylinder forming cylinder is easy to store in a cardboard box and is displayed in a standing position. It's becoming easier to peel.

Therefore, coffee, black tea, Japanese tea, etc. have come to be packaged for such a rectangular tubular bottom bag from the conventional can storage state.

<Problems to be Solved by the Invention> Thus, the number of such rectangular tubular bottomed bags when stored in a cardboard box or the like, as compared to a pillow type bag, and
Although there are advantages in terms of workability, compactness of storage volume, and shape retention, the square or rectangular corner bottom of the sheet causes the seat to bend from the side to the valley fold line or the mountain fold line. A lateral seal is formed by folding the sheet inward through a wire and pressing the sheets of the respective layers to form a quadruple layer at the tip of the sheet, followed by heat welding.

By the way, the lateral seal is naturally made of a single composite film sheet as a general bag itself, and the composite film sheet is provided with the heat-welding property only on the inside so as to facilitate the heat-sealing. Since the outer surfaces of the lateral seals are not folded, both sides of the lateral seal are not heat-welded. Therefore, only the longitudinal half of the lateral seal or about three-fourths of the inner surfaces are welded to each other. In the portion, the Y-shaped folded portion is still formed, and the Y-shaped portion is likely to open easily. The Y-shaped part with a fold line opens and the horizontal seal cannot be folded against the corner bottom part of the lower bottom. Especially, when the composite film sheet is hard, this tendency is strong, and in a showcase, etc. There is a minus point not surely be revealing the attitude, there has been a problem that the occurrence of the claim to the handling can not be avoided.

Such a negative point is not good as a product even for the Y-shaped portion of the upper bag upper sealing portion on the upper bottom.

To deal with this, for example, as shown in Japanese Utility Model Publication No. 58-15305, a notch is formed in the center-folded portion, and the height of the outer portion is increased by the notch. A technique has been developed in which the inner surfaces of the parts are directly opposed to each other so that the lateral seals are heat-welded over the entire length direction so that the lateral seals do not open in the Y shape at the side portions. There is.

By the way, although the heat welding over the entire length of the seed heat welding is guaranteed, when the continuous bag-making is performed by one composite film sheet, the cutout portion is formed on the composite film sheet in the earliest process. When cutting the unit bag when drilling, the cutting edge and the notch become continuous,
The strength is reduced at the cutout portion, and the continuous film sheet is torn, and in that case, it is easy to cause a trouble in which the film sheet has to be separated once to return to the initial state, and therefore the continuous bag-making process is performed. There was an inconvenience that it interfered with.

When the corner bottom of the lower bottom of the formed square tubular corner bottom bag is displayed on a shelf of a store or the like, the horizontal seal must be bent to the corner bottom, but the outer surface of the film sheet is Since it is not possible to heat weld because of the bending of the horizontal seal, the independence of the horizontal seal is still strong, and it is difficult to reliably maintain the standing posture of the rectangular tubular corner bottom bag in the display state. However, when the hardness is high, the tendency is strong.

In such a case, an automated device may be used to forcefully collapse the lateral seal to give a so-called habit, or a means of using an adhesive such as hot melt to make the material adhere to each other may be adopted. , Equipment becomes complicated, man-hours increase,
It had the disadvantage that it would be expensive, so it could not be adopted in practice.

Therefore, even when it is stored inside a cardboard box, etc.
Alternatively, it is often the case that the product is displayed in a sideways state without standing upright on the display shelf.

<Object of the Invention> An object of the invention of the present application is to solve the problem of the horizontal seal formed on the corner bottom portion of the square tubular corner bottom bag based on the above-mentioned prior art. Using the same packaging equipment as in the conventional mode, continuous wrapping is reliably performed by avoiding tearing or cracking of the film sheet in the bag making process, and moreover, the heat welding to the square bottom of the horizontal seal on the lower bottom is also performed accurately. The shape of the corner bottom is always guaranteed and stored in a cardboard box, etc.
In transportation, work can be done in a fully filled state, compactness can be achieved, the filling amount can be increased, and the number of works can be reduced.
Further, it is an object of the present invention to provide an excellent rectangular tubular corner bottom bag which can maintain a standing posture in a desired order on a display shelf, and which is useful for a field of packaging technology in the distribution industry, and a manufacturing method thereof. Is.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the structure of the invention of the present application, which is based on the above-mentioned object, has a heat-weldable film sheet and has a longitudinal direction. Have a seal,
The bottom of the bag has an inner bottom composed of two seat portions, a seat portion formed into a triangular shape by bending from the left and right sides inward as viewed in the longitudinal direction of the inside of the bag and a seat portion bent from the front and rear sides inward. The outer side is also composed of a sheet portion that is formed into a rectangular shape by bending from the front side to the inner side as viewed in the longitudinal direction of the bag, and the outer bottom is superposed and integrated. In the bag, the upper bottom is formed in a chevron shape, and the folded portion of the four-layer sheet portion of the outer bottom of the lower bottom is superposed on the folded portion with the sheet portion of the triple layer of the inner bottom, and the four-layer sheet of the outer bottom is formed. Of the three-layer sheet portion formed by the inner portion and the inner bottom triple-layered sheet portion, two sheet portions, that is, the third sheet portion from the innermost layer sheet to the second sheet portion from the outermost sheet portion, are opposed to each other. Open formed Technical measures have been taken to form a square tubular bottom bag in which all the sheet parts are integrated by heat-welding mutually opposing inner surfaces of the sheets without having the opening holes through the holes. is there.

<Operation> Thus, the roll of the sheet-shaped film sheet having the inner surface provided with the heat-welding property is mounted on the packaging device, and the film sheet fed from the roll is automatically fed through the former of the packaging machine body. In the process of forming a square cylinder with a rectangular cross section using a forming cylinder, a predetermined size as the heat-welding part in the lower bottom corner bottom part and the upper bottom upper sealing part at a set pitch at the predetermined part in the previous stage. Of the opening holes of the backing small piece whose inner surface is also heat-welded to a predetermined portion before and after the opening of the opening holes is adhered at a predetermined pitch, and the heat The welded portion is exposed from the opening, and after passing through the former, the film sheet is fed along a forming cylinder having a rectangular cross section with a general cross section, and both side edges in the vertical direction are polymerized. Vertical seal It is formed by heat welding, and the sheet parts on the front and rear sides are folded inward through the mountain fold line and the valley fold line at a predetermined portion, and the lower horizontal seal is closely formed and brought into close contact by heat fusion. In the process, the opening holes are formed in the process from the third to the outermost from the innermost sheet of the seven-layered sheet formed by the outer-layered four-layered sheet at the bottom of the bottom and the triple-layered sheet at the inner bottom. Since the opening holes are formed at the opposite positions of the second sheet of the second sheet in FIG. 1, the inner surfaces of the lateral seals exposed to the opening holes and facing each other are heat-welded to each other. The corner bottom is squared out, and in the lower bottom, the lateral seal is bent and abutted against the outer bottom of the corner bottom. At that time, the bent inner surface and the outer bottom of the lateral seal form the opening hole. Abutted through to be integrated by heat welding, or attached to the opening hole. The back seal piece sheet and the inner surface of the outer bottom come into contact with each other to be backed, so that the horizontal seal is closely heat-welded and integrated with the corner bottom portion, and the corner bottom portion of the lower bottom is integrally flattened. Then, the product is filled into the rectangular tube from the upper forming cylinder, the upper part is horizontally sealed, and then one unit is automatically formed into the rectangular cylindrical bottom bag by the horizontal cutting, and then the cardboard is filled. in case of,
A flat bottom of the lower bottom is filled without dead space for transportation, and a display in a standing position on a display shelf can be surely guaranteed through the flat bottom. Is.

<Example> Next, an example of the invention of this application will be described with reference to the drawings.

In the embodiment shown in FIGS. 1 to 6, the embodiment shown in FIG. 1 is a rectangular tubular corner bottom with a gazette type upper bottom having a chevron shape and a lower bottom having a flat bottom shape, which constitutes the bag body (L) shown on the lower side of the figure. A mode of vertical packaging using a forming cylinder (b) for forming a bag, wherein the bag body (le) is formed into a bag according to a set bag size and a product storage capacity, and the inside thereof is formed. Sheets such as potato chips (not shown in the figure) are automatically packaged while being filled, and these operations are performed by a film roll (c) used for bag making with heat-sealing properties only on the inner surface. The film is intermittently fed, and the mechanical movement therebetween is performed.

In the meantime, the packaging machine is controlled so that its operation can be smoothly performed by an appropriate combination of rollers such as a feed roller and a dancer roller, regardless of the packaging speed or the diameter of the film roll (c). Is being done.

In packaging, the former (a) and the lower part of the former (a) are equipped with a cylindrical upper section and a lower rectangular section, and the upper section is for supplying products not shown. A sheet-shaped film whose inner surface is heat-welded is drawn out from the film roll (c) by a forming cylinder (b) to which a hopper is connected to form a square tube. ) From the position where the film is mounted to the former (a), in the process of forming the final packaging form in the predetermined area, the film will not break, stretch, or otherwise meet the predetermined small amount described below. Opening device for opening an opening of a size (d)
(Details omitted) are placed opposite to each other with the film in between, and the substantial length Y of one bag of film having the set width X shown in FIG.
A round bottom at the bottom of the bag body (L) is formed for each of them, and a round hole is set at a set position in order to maintain its shape and the top-bottom bag of the upper bottom also holds a predetermined shape. The required number of shapes of the small-sized openings are punched.

FIG. 2 is a plan view of a film in which a circular opening is punched in a predetermined portion as seen from the inside, and a two-dot chain line shows a valley fold line and a dotted line shows a mountain fold line (both from the outside). ,
Further, the thin line indicates an overlapping portion without bending, and the lowercase alphabetical letters are added as suffixes to the Arabic numeral symbols 1 to 8. The suffixes b and b'shown by the solid line indicate the opening hole, and the suffix a shown by the dotted line. , A'represent the welded portions corresponding to the openings b, b ', and the film is formed by the former (a) along the forming cylinder (b) into a cylindrical shape in the drawing-down process. (B) While pulling down from the upper part to the lower part along the outside of (b), both edges of the vertical direction are face-to-face polymerized while cornering each corner of the four corners, and heat welded by the vertical heater (e) to vertically seal. , To form a rectangular tube.

The square tube thus formed is pulled down along the forming cylinder (b) by the length Y of one bag, and a belt-type film feeding device (f), (f ') is used to move downward a predetermined amount in the middle of the process. The film feed device is pulled down to the position, and the film feeding device (f) and (f ') are stopped and lifted intermittently, and a horizontal seal is formed by heat welding at part E in FIG. A corner bottom portion of the bottom is formed, and a product (not shown) is introduced from above through a forming cylinder (b) and dropped and filled to seal the upper sealing portion A of the upper bottom by heat welding.

Since the packaging cycle is intermittently performed as described above, the product is dropped and filled while the lower bottom corner bottom is formed, and the upper side horizontal seal is formed. The upper sealing portion A of the upper bottom and the lower portion E of the upper bag of the next upper stage, which is to be laterally sealed to form the corner bottom portion of the lower bottom in preparation for the next filling of products, are vertically connected. , A horizontal heater (g), (g ') provided opposite to the lower end of the forming cylinder (b) by a predetermined distance for the reason described below.
Are formed in a groove shape along the longitudinal direction in the center of the inner seal portions which are opposed to each other in the longitudinal direction along the longitudinal direction, and the E portion is formed for each bag in the groove on the lateral heater (T ') side on the rear side. And a cutting knife (h) that separates part A from the horizontal heater (g),
The left and right gusset tuckers (r) and (r ′) that operate in the direction perpendicular to the horizontal sealing operation of (t ′) are
It is provided above (g ').

In addition, inside the forming cylinder (b), the inside of the forming cylinder (b) is arranged so as not to hinder the dropping of the products that are dropped and supplied from the top to the bottom. Side bottom support plate (e) provided at the lower end of an elevating rod (not shown) that is provided via a predetermined link mechanism (not shown) and extends downward from above, closes the lower end of the forming cylinder (b), Further, it is designed so that it can perform a butterfly-like operation in which it is raised 90 ° to open in a vertical posture (details of the operation are omitted).

The length of one bag, that is, the length Y in FIG. 2 is set at a predetermined portion of the film fed from the film roll (C).
As described above for each dimension, the product name, characteristics (advertisement advertisement text), etc. are appropriately printed in advance (not shown in the figure), and further, at least one of both edge portions of the film is wrapped by a filming operation. Registration marks Z and Z'for control for keeping synchronously correct positions of the roll (c) and the packaging machine in the cycle operation are appropriately printed, and are mechanically set to the bag size. To accurately perform the respective operation timings of the above-mentioned opening hole opening device (d), vertical heater (e), horizontal heater (to), (to '), and further gusset tucker (ri), (ri'), etc. Corresponding to the registration mark Z, Z '
A photoelectric reading device (Y) is provided so as to face a predetermined position of the edge portion of the film in the front stage of the aperture opening device (D), reads the registration marks Z and Z ', and accurately reads the film roll (C). The film is fed in the length dimension Y for one bag, and the stop is controlled.

Then, at the same time when the rotation feed of the film roll (C) is stopped, the horizontal heaters (G) and (G '), which have been kept in a posture maintaining a predetermined interval, are formed on the upper side of the film formed in the rectangular tube. In the process of bag making, in the process of bag making, the lower part E of the next rectangular cylinder that is continuous to the upper part is pressed from the front and back, where the gazette tucker (ri) and (ri ') are pushed from the left and right. The side of the film is folded inward through a valley fold line and a mountain fold line to sandwich the E portion while forming the corner bottom portions of the upper bottom and the lower bottom,
As shown in FIG. 5, a quadruple layer is formed, heated and pressed to heat-weld to form a lateral seal, and further, a cutting knife (h) set in the lateral groove of the lateral heater (g ') is pressed. By moving forward, the A part and the E part are cut up and down and separated, during which the gusset tucker (ri) and (ri ') return to their original posture position, and then the lateral heaters (to) and (to') After returning to the original posture position (the movements of the main devices that perform up / down, forward / backward, and other operations due to the bag-making packaging are indicated by arrows in the drawing), the facing interval is widened with the film in between.

In this way, when the corner portion due to heat welding and the E portion of the lateral seal forming the outer bottom of the bottom portion of the lower bottom are formed, the film feeding devices (f) and (f ') are reversed to move the corner bottom portion. Raise
It was placed in a horizontal position in the forming cylinder (b) and returned to the bottom support plate (b) that was standing by until it came into contact with the bottom support plate from below, so that it would not interfere with the operation of these parts. The square bottom heating adhesive plate (e) is moved from the initial position to the lower part of the forming cylinder (b) by an elevating and retracting mechanism (not shown) such as an elevating rod and a link to raise the E portion of the horizontal seal while bending it at an angle. The lateral seal of the E portion, which seals the bottom portion, is tilted to the inner bottom side of the square bottom portion and brought into contact therewith, and a triple-layered sheet portion having a triangular shape when viewed from the longitudinal direction of the inner bottom between the bottom portion and the bottom support plate (n). Similarly, the seven-layer portion of the rectangular four-layer sheet portion as seen in the longitudinal direction of the outer bottom is shown in FIGS.
As shown in I, it is laid down on one side to be brought into a close contact state and pressed and heated. As for the adhesive openings 1 to 5, as shown in FIGS. Opening b of
The welded portions a and a'on the inner surface of the bonded portion are heat-welded and bonded via b ', and as a result, as shown in Fig. 4 III, the inner bottom and the outer bottom are integrated and the corner bottom Is flattened, and when this operation is completed, the square bottom heating adhesive plate (e) is reversely operated to return to the old position and posture, and the square tube having the square bottom is photoelectrically operated with respect to the registration marks Z and Z ′. By the reading by the reading device (Yo), the film is fed to that position again to form the horizontal seals of the upper and lower parts A and E through the signal, and the driving of the film feeding device (f) and (f ') is driven. Sent through,
By the time of stopping, the bottom support plate (n), which had closed the lower part of the forming cylinder (b) in a horizontal position until then, was set to a vertical position of the inner bottom part of the forming cylinder (b) by a cylinder not shown. A set amount of products is loaded from the hopper on the upper part of (b) and dropped into the rectangular tube, and then the horizontal heaters (g) and (g ') are used to form the horizontal seal at the predetermined position as described above and the bag The series of operations of cutting and separating is repeated to continue the packaging.

In this way, the product filling and packaging is completed, and the packaging completed bag (L) formed in the posture shown in FIG. 3 is dropped downward and sent to the next step such as cardboard case packaging.

Then, in the next packaging cycle, the lower E that fills the product
The side part is sealed and the gazette tucker (re),
The corner bottom of the bag (L) is squared by (L ') and the bottom bottom of the bag (L) is set inside the forming cylinder (B) by the lifting rod and link mechanism (not shown) as described above. Then, the product is dropped and filled in the vertical posture at an angle of 90 degrees, and the product is placed in the horizontal posture under the forming cylinder (b), and the above cycle is repeated.

Next, in the embodiment shown in FIG. 7 and subsequent drawings (partly partially referring to FIG. 1), the registration mark Z,
The alphabetical display other than Z'is indicated by a dash, but it is a rectangular tubular bottom bottom bag having a width of X'and a length dimension of Y ', and a manufacturing method thereof. , And the operation of each part of the packaging machine is substantially the same as that of the above-mentioned embodiment, but each reference numeral indicates a solid line at the E portion forming the outer bottom at the joint, b and b'denotes an opening hole, and a indicated by a dotted line. , A'indicate the inner surface of the corresponding welded portion, which is formed into a quadrangular shape as compared with the round shape of the above-mentioned embodiment, and as shown in FIG. The film (wa), (wa ') of the rectangular sheet of the backing piece which is only provided in the above is formed with the opening holes 12b', 13b ', 16b' by the adhesive hole opener (d) shown in FIG. After punching 17b '(which is a square hole as described above in this embodiment),
The tape is mounted on a packing machine in a predetermined shape, and a backing piece adhering device (f) (Fig. 1) is used to measure the width of D ', which is close to C'of the film, to be slightly smaller than the width of H'and J'. Narrow H'hole opening 12
b'and 13b 'are fully covered and the opening holes 12b' and 13b
The holes 16b 'and 17b' in the J'section are also slightly separated from b '.
When the heat-welding surface of the inner surface of the film is inverted by the former (a) at a size and position slightly separated from the opening holes 16b 'and 17b', the film is not covered by the forming cylinder (roller). ), The backing film adhesive bonder shown in FIG. 1 is formed as shown in FIG. 7 so as not to drop off before being formed into a rectangular tube and sent downward to form the corner bottom. (F) The small circle portion 21 is spot-welded to the inner surface of the film by heat welding (adhesion at three points indicated by small circles in this embodiment) to be integrated, and then the product is filled in the same steps as in the above embodiment, Horizontal seal molding and bag separation are performed.

Thus, in this embodiment, the film (wa), (wa ') of the sheet of backing piece is integrally attached to the inner surface of the film at a predetermined position, which is not possible in the above embodiment. 12, 13 parts of D ', H'part, D',
The flat bottom of the corner bottom of the lower bottom is surely revealed at the 16 and 17 parts of the J'part, and the horizontal seal of the E'part of the adhesive opening 9, 11, 14 is also integrally bonded to the corner bottom. The embodiment is a mode in which the corner bottom portion where the E portion is formed in the seven-layer structure is heat-welded to enhance the strength at the opening portions 10 and 15, and the embodiment is a bag or a package requiring excellent shape retention. In this case, it is particularly effective.

Incidentally, it goes without saying that the embodiment of the invention of this application is not limited to each of the above-mentioned embodiments, and for example, it can be applied to a horizontal packaging machine instead of the vertical packaging machine shown in FIG.
Further, it is also applicable to a so-called mandrel type high-speed large-sized packaging machine, and in such an embodiment, the mandrel portion which is the bag-making portion of the large-sized mandrel type packaging machine has a filling mechanism, and the upper seal portion is completely Since it is separated into two parts, the corner bottom can be reliably molded easily, and in the case of a small-sized rectangular tubular corner-bottom bag, the corner-bottoms are pre-made by a bag-making specialist for each bag. Various modes can be adopted, such as the case where a bag is purchased and a corner bottom can be easily formed at the bottom when filling the product.

<Effects of the Invention> According to the invention of the present application, beverage products such as coffee, black tea, and Japanese tea, or snack products such as potato chips and confectionery products such as so-called small unit pieces are packaged to a store. A sheet-shaped film whose inner surface is heat-weldable in a square tubular square bottom bag with a mountain-shaped upper bottom and a flat-bottomed lower bottom, which is used for the transportation of products and for display in the store. On the packaging machine, and then fold the corner bottom through the valley fold line and the mountain fold line.For the lower bottom, the bottom horizontal seal is folded into the inner bottom of the corner bottom, and the polymerization of the seven layers of the corner bottom is performed. Since all the parts can be adhered and heat welded, the bottom of the molded rectangular tubular square bottom bag is a flat square bottom that is perpendicular to the side surface, so it can be transported by packing in corrugated cardboard. When offering, stock again In this case, it is possible to store the cardboard in a dense and dense manner in the cardboard, and therefore, it is possible to take a volume that allows reliable storage, and the number of stored items can be increased and packed without requiring skill. It has a number of excellent effects, such as good work efficiency, good packing efficiency, and good shape retention.

Also, as originally required for displaying products at retail stores, the products printed on the side of the bag can be arranged and displayed in an orderly manner while standing on a display shelf. The specifications and explanations can be easily viewed, the appearance is good, and the excellent effect that the product display exhibition effect is improved, and also the effect that the inventory management of the display quantity can be done at a glance, There is also an effect that the purchaser can easily take out the product from the display shelf.

Also, the four-layer portion of the outer-bottom film sheet forming a transverse seal is polymerized with the triple layer of the inner-bottom film sheet forming the corner bottom portion in the lower bottom, and the four-layer portion of the outer-bottom film is superposed. Since it is possible to form the opening holes in the opposing portions of the two sheets of the third to outermost sheets from the innermost sheet of the multi-layered sheet and the inner bottom triple-layered sheet In addition, the inner surfaces of the sheets facing each other through the opening holes are heat-welded to each other, and therefore, only the bending action of the film having the inner surface made into the heat-welding property without using other adhesive means such as hot melt is used. The heat-welding effect can be imparted by the above, and an excellent effect that a square tubular corner bottom bag having a full flat corner bottom can be formed is exhibited.

Also, during lateral sealing, since the heat-welding inner surfaces of the opposing sheets are heat-welded to each other through the opening holes, the side portions open in a Y-shape as in the conventional case and the shape collapses or the filling occurs. It also has an excellent effect that it does not hinder the display.

Further, even when the lateral seal of the lower bottom corner bottom is laid down to the inner bottom to form a full flat corner bottom, the lateral seal and the inner bottom are thermally welded, which is an excellent effect.

Further, in the square tubular corner bottom bag, not only the sealing property is good because the corner bottom portion is a heat-welded and tightly adhered layered portion, but the overlapped portion of the corner bottom portion is strong. An excellent effect that is useful for improvement is exhibited.

Then, the backing piece is attached to the inner surface of the inner bottom of the corner bottom portion of the overlapped portion in the bag making process, and the innermost sheet and the innermost sheet of the seven-layered sheet are placed at the opposite overlapped portions of the backing piece. 2 from outer layer sheet
By the back welding small piece and the inner surface of the sheet facing and abutting the backing small piece through another opening hole formed in the opposite portion of the second sheet to face each other, by heat welding to the outer surface of the backing small piece, Not only is the outer and inner bottoms of the horizontal seal heat-welded, but the crossing is reinforced by the small backing pieces that are orthogonal to the horizontal seal, which further improves the strength of the square bottom and further improves the sealing performance. There is also an excellent effect of doing.

Further, since the opening hole is provided at a predetermined position forming the square bottom portion, a continuous cutout portion is not formed with respect to the edge portion thereof, and therefore, a complicated process is performed while giving a predetermined tension. The supplied sheet does not break or crack in the bag manufacturing process, and therefore, an excellent effect that product accuracy is high and reliability is improved is exhibited.

In addition, in the manufacturing method of the rectangular tubular corner bottom bag, after the vertical seal is formed by the forming cylinder, it is folded inward on both sides so that the opening holes face each other, and first, the horizontal seal is formed and heat-welded. As a result, thermal welding in the longitudinal direction of the lateral seal is reliably performed by extending to both ends thereof, and therefore,
In the process of following the step of bending the horizontal seal to the inner bottom of the bottom corner of the bottom, as described above, at both ends of the horizontal seal, a trouble may occur when the Y-shape is opened and bent. Therefore, there is an effect that the full flat corner of the bottom of the lower bottom is surely performed.

Then, the lower bottom is inclined with respect to the inner bottom of the square bottom portion of the horizontal seal so that the opening holes face each other, and the inner surfaces of the sheets facing each other through the opening holes face each other and are heat-welded. As a result, the corner bottom portion is flattened to form an adhesion superposition portion, and further, an excellent effect that the work is rapidly performed because these processes are performed in series.

Furthermore, the folding and polymerization flattening of the square bottom of the lower seal with respect to the inner bottom is performed by temporarily returning the square cylinder in the longitudinal direction, and thus it is possible to perform close contact pressing using the bottom of the molding cylinder. Further, heat welding can be further added, and an excellent effect that the heat-welding of the contact flat portion of the corner bottom portion can be surely performed is exhibited.

[Brief description of drawings]

The drawings are explanatory views of the invention of this application, FIG. 1 is a perspective view showing one embodiment, FIG. 2 is a development view seen from the inside of one bag of the film, and FIG. Perspective view of
4, I, 4 and II, and 4 and III are perspective views of the process of forming the bottom of the packaging completed bag of FIG. 3, and FIG. 5 is the S-S 'arrow of FIG. 4 and II. FIG. 6 is a cross-sectional view, FIG. 6 is a perspective view of an intermediate process of the upper horizontal seal taken at the same time as FIG. 4 II, and FIG. 7 is a development view from the inside corresponding to FIG. The figure is a perspective view of the various parts of the packaging-completed bag.
I, FIG. 9 and II, and FIG. 9 and III are perspective views of the molding process of the bottom of the packaging completed bag of FIG. 8, and FIG. 10 is S- of FIG. 9 II.
FIG. 11 is a perspective view of the upper horizontal seal at the same timing as FIG. A …… former, b …… forming cylinder, c …… film roller, d …… adhesive hole opening, e …… vertical heater, f, he ′ …… film feed, t, to ′ …… horizontal heater, chi ...... Cutting knife, re, re '... Gazette tucker, Nu ... Bottom support plate, Le ... Packaging completed bag, O ... Bottom heating adhesive plate, Wa, Wa' ... Backing piece film, Ka ... Backing small piece adhesive device, Yo ... photoelectric reading device for registration mark, 1-6 ... Adhesive part at the bottom of the round-hole adhesive bag, 6-8 ... Adhesive part at the top of the round-hole adhesive bag, 9-17 ... Adhesive part at the bottom of the square-hole adhesive bag, 18 to 20 ... Adhesive part at the top of the square-hole adhesive bag, (b, b'in the lower case alpha beds attached to 1 to 20 are open holes, and a and a'are open. 21) Shows the heat-bonded part of the packaging film through the holes) 21 …… The heat-bonded part of the backing film, yy ′ …… Length of one packaging bag, To E, A'to E '... Y, Y'positions of each part, X, X' ... width of winding packaging film, F to L, F 'to L' ... X, X ' Position of each part in

Claims (6)

[Claims] 1. An inner surface made of a heat-welding film sheet, having a vertical seal, and a bottom of the bag formed into a pair of triangular shapes by bending inward from both left and right sides as viewed in the longitudinal direction of the inside of the bag. The inner bottom consisting of the seat part that is bent, the seat part that is bent from the front side and the back side to the inside, and the seat part that is bent from the left side to the inside side; Is a rectangular shape through, has a top bottom and a bottom bottom consisting of the outer bottom of the front and rear edge overlapped sheet portion, the cross section of the general portion is a square-shaped square bottom bag cross section, The outer bottom is formed in a chevron shape, while the lower bottom is bent inward from one side of the front and rear sides of the outer bottom quadruple layer.The bent portion of the seat part is bent from both the left and right sides of the inner bottom triple layer seat part. Partially polymerized and quadrulayer on the outsole Of the seven-layered sheet portion that is formed by the sheet portion and the triple-layered sheet portion of the inner bottom, the three sheets from the innermost sheet to the second outermost sheet A rectangular tubular corner bottom bag, characterized in that the inner surfaces of opposed sheets having no opening holes are integrated by thermal welding through the opening holes formed at the opposite parts. 2. The square tubular bottom bag according to claim 1, wherein the opening holes are formed at different portions. 3. An inner surface made of a heat-welding film sheet, having a vertical seal, and the bottom of the bag is bent inward from both left and right sides as viewed from the longitudinal direction of the inside of the bag to form a pair of triangular shapes. The inner bottom consisting of the seat part that is bent and the seat part that is bent from the front side and the rear side to the inside and that is bent from the left and right sides to the inside, and the inside bottom from both the front and rear sides as viewed from the same longitudinal direction on the outside of the bag. Is a rectangular bottom bag having a rectangular cross section and a top and bottom bottom formed of an outer bottom of a sheet portion having front and rear edges overlapped, and a cross section of a general portion is a square bottom bag having a quadrangular cross section. The outer bottom is formed in a chevron shape, while the lower part of the outer bottom quadruple layer is bent inward from one side of the front and rear sides of the seat part. The outer bottom is superposed on the folded part. Of the polymerization-integrated seven-layered sheet formed by the four-layered sheet and the inner bottom triple-layered sheet, the two sheets from the third innermost sheet to the second outermost sheet are stacked. The inner surfaces of the facing sheets having no opening holes are integrated by heat welding through the opening holes formed at the facing portions, and the inner surface of the backing piece is a heat-welding small piece of the innermost layer. The backing piece sheet is adhered to the inner back surface of the sheet, and through the other opening hole formed at the portion where the innermost layer sheet and the second outermost sheet of the seven-layer sheet face each other, A rectangular tubular bottom bag, wherein the inner surfaces of the sheets facing and abutting each other are heat-welded to the outer surface of the backing piece sheet. 4. The square tubular bottom bag according to claim 3, wherein the other opening holes are formed at different positions. 5. A sheet having a heat-welding inner surface is formed into a square tubular shape having a quadrangular cross section, both side edges are overlapped to perform vertical sealing, and the square tubular sheet is bent from the side. A square tube shape in which a chevron-shaped upper bottom and a flat-bottomed lower bottom are formed into a square bottom portion, a horizontal seal is formed and cut, and the horizontal seal portion is pressed down and adhered to the bottom surface of the lower bottom. In the method of manufacturing a square bottom bag, in the sheet feeding process, opening holes facing each other are formed in the bent portion forming the bottom corner of the lower bottom of the square tubular corner bottom bag, and the corner bottom forming process is performed. After forming the vertical seal, both sides of the corner bottom portion are folded inward along the longitudinal direction, the opening holes are opposed to each other to form a horizontal seal by adhesion, the horizontal seal is cut under, and then the horizontal seal is cut. Inclining to the inner bottom side of the corner bottom and welding to the inner bottom, and having a horizontal seal with the inner bottom through the opening hole Method for manufacturing a prismatic angle bottom bag, characterized in that so as to integrate the outsole. 6. The welding according to claim 5, wherein the welding to the inner bottom of the lateral seal is performed by returning the rectangular tube formed after the thermal welding of the lateral seal to the longitudinal direction. A method for producing the described rectangular tubular corner bottom bag.