JP2002193244A - Square-bottomed paper-made container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a standing pouch having a form and structure which enables use of a material chiefly employing paper as a material for a standing pouch. SOLUTION: A square-bottomed paper-made container is provided, having a tapered top and the following characteristics: a square bottom is formed on one of a pair of thermal melt-bonded enclosure end parts of a pillow shaped bag body which is formed by having, for its inside face, the thermal melt-bonded resin layer of a multi-layer sheet comprising paper layers on at least one face of which is laminated the thermal melt-bonded resin layer, the square bottom being made by press-crushing one end of the foregoing thermal melt-bonded enclosure end part in flat state in the direction toward the other end thereof, with a triangle shaped portion, formed at both ends of the flat surface, being folded toward the rectangular portion in the center side and bonded, while the ratio of length between the length of a side of the top enclosure end which is the other thermal melt-bonded enclosure end part and the length of a side of the square bottom which is in parallel with the forgoing other side is made 1.0:0.7-1.0:0.5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a milk beverage in a container,
The present invention relates to a container mainly made of paper, in which each content is stored in a vertical pouch generally called a "standing pouch", which is suitable for soft drinks and the like, and is widely used for single use and refilling purposes.

[0002]

2. Description of the Related Art Recently, self-standing containers called "standing pouches" have been widely used for soft drinks as well as soft drink containers and mineral water containers along with roofable gable containers and brick brick containers. Has been adopted. The standing pouch is composed of a member mainly composed of a film, and an integrated operation from winding to molding, filling, and sealing of a top portion is performed by a special packaging machine (for example, pages 342 to 342 of "Handbook of Aseptic Technology"). 351 pages, issued by Business Center Co., Ltd. on May 25, 1983.) In some cases, bags may be made in advance using a dedicated bag making machine, and then filling and sealing may be performed. This type of container is a self-contained container made by laminating a laminated film of synthetic resin film, aluminum foil, etc., and it is possible to make the container almost flat before filling and after discharging the contents, It has the minimum volume, but the bottom is opened when the contents are put, and it is self-standing.

In recent years, the use of refillable containers has been increasing from the viewpoint that disposable containers pollute the environment. For example, a liquid detergent for kitchens is a typical example. Most of these containers have a small bag made of a synthetic resin and a dedicated extraction port. In addition, some containers of this shape are used for soft drinks etc. by providing a spout with resealability with a special screw cap, and the container is generally made of aluminum foil laminated members And
After refrigerated storage, the screw cap can be removed for drinking or resealing.

[0004]

Most of these standing pouches are made of synthetic resin as a container member, and it is pointed out that high calorie heat generated during incineration may damage the incinerator in some cases. Have been.
Further, as a weak point of the conventional synthetic resin-based standing pouch, it is mentioned that it is difficult to stand alone because the whole container material has no rigidity. In addition, standing pouches made of synthetic resin-based materials often assist independence by making the bottom seal shape elliptical, but the rigidity of the container increases when the amount of content is increased. There was a drawback that it was insufficient and it easily fell.

[0005] In view of the above situation, a container material mainly composed of paper having low calorie burn and strong stiffness has been studied instead of a container material mainly composed of synthetic resin. Many gable containers and brick-type containers mainly used are used. An object of the present invention is to provide a standing pouch having a shape and a structure that allows use of such a paper-based material as a material for the standing pouch.

[0006]

The inventors of the present invention have studied the use of a paper-based material for a standing pouch-shaped container. As a result, the rigidity of the paper container and the ease of forming the bottom portion have been studied. Now, they have found that a standing pouch that can take advantage of good autonomy can be manufactured, and have reached the present invention. The present invention includes the following inventions.

(1) A multilayer sheet in which a heat-welding resin layer is laminated on at least one surface of a paper layer. On the other hand, the welded closed end is flattened and crushed toward the other welded closed end, and the triangular portions formed at both ends of the flat surface are folded over the central rectangular portion to form a square bottom. And the ratio of the length of the side of the tapered top closed end, which is the other welded closed end, to the length of one side of the square base parallel to this side is 1.0: 0.7 to
A paper bottom container having a tapered top, wherein the ratio is 1.0: 0.5.

(2) The paper having a tapered top according to (1), wherein the pillow-type bag body is formed by welding a pair of closed ends and a waist portion in a jointed palm shape. Square bottom container.

(3) The pillow-type bag body has a body tension portion formed by laminating side end portions of a multilayer sheet folded in a cylindrical shape on top of one another and attaching the envelope to an envelope. The paper-made square bottom container having a tapered top according to (1), wherein the heat-welding resin layer is welded so as to cover the entire cross-section of the side edge of the multilayer sheet exposed to the inside.

(4) After closing one end of the cylindrical body, the square bottom container is filled with the contents from the remaining unclosed other end, and then the other end is welded closed. , Followed by forming a square bottom, characterized by (1)-
(3) A paper square bottom container having a tapered top according to any one of the above (3).

(5) The square-bottomed container is characterized in that its body has no fold and has a rounded container appearance.
The paper bottom container according to any one of items (1) to (4). (6) The square bottom container has folds provided from four corners of the body corner bottom toward the top of the container, and the appearance of the container has a square shape. (4) The paper bottom container according to any one of the above (4).

(7) A paper layer and the paper layer, or a paper layer and another laminate layer if the paper layer further has a laminate layer, except for the innermost heat-welding resin layer of the multilayer sheet constituting the container. Characterized in that a tear opening means consisting of a perforation line formed through the container is provided from the closed end of the upper part of the container to the side wall of the filling portion of the container, any one of the items (1) to (6). The container according to claim 1 or 2.

(8) A punched hole is provided on the upper side of the container body.
The paper-making device according to any one of items (1) to (6), further comprising an opening means comprising a tab member which covers the punched hole portion from the outside and is removably adhered. Square bottom container.

(9) The punched hole penetrates the paper layer except for the innermost heat-welding resin layer of the multilayer sheet constituting the container, or the paper layer when the paper layer further has a laminate layer. The paper-made square bottom container according to (8), wherein the container is formed so as to penetrate through and another laminate layer. (10) An openable / closable spout communicating with the container storage section is provided at the upper closed end of the container.
(6) The paper-made square bottom container according to any one of the above (6).

(11) A multilayer sheet in which a heat-welding resin layer is laminated on at least one side of a paper layer is bent into a cylindrical shape with the heat-welding resin layer inside, and the opposite side ends are welded together in a palm joint type. Forming a cylindrical body having a pair of open ends by welding and closing one open end, filling the contents, and then welding and closing the other open end to fill the contents. A step of forming a pillow bag, crushing the other closed end in a flat shape toward the one closed end while holding one closed end of the pillow bag in a tapered fixing device; Forming a tapered top and a square bottom by folding and bonding a triangular portion formed at both ends of a flat surface onto a rectangular portion formed at a central portion, wherein the tapered top is formed. Length of the side of the closed end and one side of the parallel square base Is 1.0: 0.7-
A method for producing a paper square bottom container having a tapered top of 1.0: 0.5.

(12) The step of forming the tubular body comprises bending a multilayer sheet in which a heat-welding resin is laminated on both sides or one side of a paper layer into a tubular shape with the heat-welding resin layer as an inner side, and facing each other. Attaching the parts to each other with an envelope, the step of welding a heat-welding resin tape covering the entire end of the multilayer sheet exposed inside the tubular body, characterized in that the tapered top is described in (11), Manufacturing method of paper bottom container.

(13) In the step of forming the square bottom, the one closed end of the pillow bag is sandwiched and fixed in a taper type fixing device, and the other closed end is crushed in a flat shape. Characterized in that it is formed by folding and bonding a triangular portion formed at both ends of the surface on a rectangular portion formed at the center portion (11) or (12). A method for producing a paper bottom container having a top.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION A square bottom container according to the present invention is formed of a member mainly made of paper, and has a standing pouch type having a square bottom and a tapered top (top). It is a square bottom container. The square bottom container is basically a pillow-type bag formed by heat-sealing both open ends of a paper-made cylindrical bag member on which a heat-welding resin layer is laminated as an innermost layer. Has a shape in which only one of the end portions of the heat seal is formed into a square bottom.

The square bottom is squashed flat in the direction of the one closed end while the other end of the pillow bag is held in a tapered fixing device while one closed end of the pillow bag is held. Triangular portions formed at both ends of the surface can be formed by folding and bonding on a rectangular portion formed at the center along a fold line perpendicular to the side of the closed end.

The size of the container can be arbitrarily set according to the application, but in order to secure independence as a standing pouch, the side of the closed end of the top (top) of the container and the side of the closed pouch are required. It is necessary that the ratio of the lengths of the sides of the parallel container corners be 1.0 to 0.7 to 0.5. The long side of the square bottom parallel to the top of the container so that the ratio of the length of the side of the closed end of the top of the container (top) to the length of the long side of the bottom of the container parallel to it exceeds the above numerical range. Even if the length of the container becomes shorter or longer, the container is not preferable because the self-sustainability deteriorates.

A multilayer sheet mainly composed of paper is used for the manufacture of the square bottom container having the tapered top (top) and the square bottom according to the present invention. The multilayer sheet is a heat-sealable laminated paper in which a heat-welding resin layer is laminated on at least one outermost layer of paper. The multilayer sheet is
One or more layers can be further provided between the paper layer and the heat-welding resin layer. As such a layer, a heat-resistant layer such as polyester or an aluminum layer can be disposed. A heat-resistant layer or a water-resistant layer such as a polyester layer can be provided on the opposite side of the paper on which the heat-welding resin layer is provided. However, the same heat-welding resin layer may be provided. Polyethylene, polypropylene, or the like can be used as the heat-welding resin.

The multilayer sheet does not impair the formability and flexibility that do not hinder the formation of the bottom of the square bottom container, and the self-sustainability and shape retention as a standing pouch when the contents are filled are not impaired. As long as it has rigidity and strength,
The thickness and type of the paper layer are not particularly limited. Usually, the thickness of the entire multilayer sheet is about 0.1 mm to 1.0 mm, preferably about 0.2 mm to 0.5 mm.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an example of a paper bottom container made of paper according to the present invention. FIG. 1 is a view showing a self-standing state of a square bottom container of the present invention, wherein a is a front view, b is a side view, and c is a bottom view. In the figure, 1 is a container, 2 is the top of the container (side of the closed end), 3 is a square bottom, 4 is a top seal,
Reference numeral 5 denotes a heat seal edge, 6 denotes a body sticking portion, 7 denotes a perforation, and 8 denotes a body.

The square bottom container of the present invention shown in FIG. 1 has an innermost layer composed of a heat-fusible resin layer and a multilayer sheet mainly composed of paper, which is envelope-adhered at the body adhering portion 6 at one end of a cylindrical body. The innermost layer is heated and welded to form the seal portion 4 to form the top (top) of the container, and the opposite end is similarly heated and welded to form the seal portion 4, as shown in FIG. 1c. The heat sealing edge 3a at the center of the container
Is bent in one direction with the base as the base, and then squashed flat in the direction of the center of the container so that the bent portion is located at the center to form a rectangular portion 3b and a pair of triangular ends 3c. The portion is formed by folding and bonding the portion on the central rectangular portion 3b along the folding line 3d.

The envelope attachment at the body attachment portion may be performed by overlapping and welding the inner layer heat-welding resin surface to the outermost layer surface of the multilayer sheet, or by using an adhesive. . In addition, since the end of the multilayer sheet is exposed on the inner surface side of the body sticking portion where the envelope is stuck, if the liquid component in the stored material from the end is disliked to penetrate, the end is removed. The heat-fusible resin tape may be covered and welded to cover.

In FIG. 1, the square bottom 3 is formed in a substantially square shape, but the rectangular portion 3b has a longer side (B) of the longer side of the square bottom 3 parallel to the side of the top heat seal end. The length (B) of the long side may be
Length of the side of the top heat seal portion 4 (A): Length of the long side of the square bottom parallel to the side of the top heat seal (B) = 1.
The length is set in the range of 0: 0.7 to 1.0: 0.5. Reference numeral 7 denotes a cutout line for forming a spout, and for example, the top sealing portion 4 formed on other layers including the paper layer of the multilayer sheet except for the innermost heat-welding resin layer.
And the like from the end to the non-seal part (storage part). Since the perforations formed in the paper layer portion of the multilayer sheet are covered with the innermost heat-fusible resin layer on the inside of the container, the contents do not seep out from the perforations.

FIG. 2 shows that a punched hole 9 is provided in place of the perforated opening means provided in the square bottom container shown in FIG. 1, and the synthetic resin layer 9b and the tab member 9a are adhered and closed from the inner and outer surfaces. 1 shows a type of square bottom container. FIG.
(A) is a plan view and (b) is a side view. The synthetic resin layer 9b closing the punched hole 9 from the inside of the container,
Although it may be a film body formed separately as shown in the figure, the innermost layer of the multilayer sheet in which punching holes are formed only in the paper layer portion while leaving the innermost resin layer when manufacturing the multilayer sheet in advance The resin layer itself may be used.

FIG. 3 shows a band-shaped sealing portion 4 of the container top 2.
Is formed wide so that a triangular heat seal portion is present at one end side of the top of the container as shown in the figure, and a perforation 7 that can be cut diagonally as shown in the figure is formed. By forming the non-heat-sealing portion 10 extending from the inside of the container (storage portion) to the perforation 7, pouring that communicates from the inside of the container to the outside of the container when the tear portion is removed from the perforation 7 to remove a corner of the seal portion The figure shows a square bottom container in which the outlet 10 appears. In the case of this container, the opening of the pouring opening 10 is normally sealed in the seal portion 4 and the perforation is covered with the innermost layer, so that the contents leak from the perforation. Never.

FIG. 4 is a view for explaining the outline of a bag making apparatus for manufacturing the square bottom container of the present invention. As shown in FIG. 6, in the opening means forming apparatus 12, an opening means comprising a punched hole 9 and a tab member 9a is formed in the multilayer sheet S unwound from the paper-based multi-layer sheet take-up 11. Is done. In addition, in the opening means attaching device 12, as shown in FIG.
Instead of closing with the synthetic resin layer 9b, an openable / closable spout 27 may be attached to the punched hole 9. FIG.
When the perforation opening means as shown in (1) is provided, it is preferable to use a method in which perforations are formed in advance in the multilayer sheet constituting the winding 11.

The multilayer sheet S to which the opening means 9 is attached is then laminated with a heat-welding resin layer on the inner surface of the bag inside the multilayer sheet by a tape supply device 13, then sterilized by a sterilizer (not shown) and dried. After that, it enters into the folding guide 14 and is bent into a cylindrical shape.
To form a cylindrical body. Next, the formed cylindrical body enters the horizontal sealing device 16, and the bottom side is heat-sealed and closed, and after filling the contents from the filling pipe 17,
The top side is heat-sealed and sealed by the horizontal sealing device 18, and the content-filled pillow bag 20 having the shape shown in the plan view shown in FIG. 10A and the side view shown in FIG. It is.

The manufactured content-filled pillow bag 20 is finally sent to a molding device 21 and fixed in a container holding taper guide 22 as shown in FIG.
One end seal portion of the pillow bag 20 is flattened and crushed by the square bottom forming jig 23 and formed into a square bottom shown in FIG. 1 to form a formed container having a tapered top (square bottom container 1). . In addition, it is also possible to perform bottom folding molding in the cutting device 19.

In the above-described apparatus, the body sticking portion in the vertical sealing device 15 is formed by a heat-sealing resin from the tape supply device 13 to one side end along the traveling direction of the multilayer sheet before being sent to the folding guide 14. This can be performed by supplying the tape 24, affixing it to the side end portions, and overlapping and welding the side end portions in the vertical sealing device. In this case, the inner surface of the formed cylindrical body is overlapped and welded or bonded, or one of the multilayer sheet side end cross-sections is exposed, or in the case of bonding, the adhesive is exposed. As shown in FIG. 8, the heat-sealing resin tape 24 covering the inner exposed cross section of the multilayer sheet is heated by a hot air supply device or the like by a vertical sealing device, and the heat-sealing innermost resin layer on the inner surface of the cylindrical body is heated. To prevent contamination of the filling contents. This method is well known as a method for treating the cross section of a brick type container.

As shown in FIG. 5, the heat-welding resin tape 24 for covering the cross section of the multilayer sheet is formed of a layer 26 made of polyester or the like and a layer 26 made of bottom-density polyethylene or the like.
5, a tape-shaped film or the like extruded so as to be sandwiched and slit into a narrow width can also be used. As another cross-sectional processing method of the multilayer sheet, a skive hemming method in which a member is cut to be approximately half the thickness and then turned back can be adopted.

In the above description, a mode in which both end portions in the traveling direction of the multilayer sheet obtained by bending the body sticking portion of the cylindrical body are overlapped and stuck together by welding or the like, but as shown in FIG. And the inner layers are pressurized and heated in the direction of the arrow and welded to form the body sticking portion 6.

The multi-layer sheet used in the above-mentioned apparatus has a container shape when it becomes a product container, for example, as shown in the front view of the self-standing container in FIG. 11A and the side view in FIG. 11B. As described above, the fold line 28 may be formed in advance so as to have a square and sharp appearance as a whole.

Example 1 A laminated sheet obtained by laminating low-density polyethylene (LDPE) to a thickness of 30 μm on the surface side (outside of a container) of 200 g / m ² of acid-resistant paperboard was used, and the tapered top of the final container in the laminated paper was used. A perforation for forming a storage product take-out opening having the same shape as that shown in FIG. 1 is formed at a predetermined position to be a cut and unsealed portion, and then a low-density polyethylene having a thickness of 40 μm is formed on the inner surface of the container. The laminate was then wound to form a multilayer laminated sheet. Then, the winding was performed by using a pillow-type bag forming and filling device (manufactured by ORIHIRO,
"ONPACK4050"), the length of the side of the top seal end is 100 mm, and the height of the pillow-type bag is 19
A pillow-type bag filled with a content (nutritive beverage) of 0 mm was manufactured.

Next, one closed end of the content-filled pillow-type bag is crushed to form a rectangular base having a long side of 50 mm and a short side of 47 mm, and a tear of the type shown in FIG. 1 having a tapered top. A square bottom bag with opening means was manufactured. Ratio of length of side of tapered top closed end / length of long side of square base (side parallel to side of top closed end) = 100/50 =
1 / 0.5

The content-filled square bottom bag was able to reliably hold its self-standing state, and the container side surface was formed by a smooth curve, and was an elegant and stable display container. Opening could be easily formed by tearing off the tapered top along the perforations.

Although the inner surface of the body of the container was not coated with a sheet cross section in the above embodiment, if coating was necessary, low density polyethylene LDPE 40 μ / PET1 was used.
A co-extruded structure film of 2 μ / LDPE 40 μ or low density polyethylene (LDPE) is used.

In the first embodiment, a continuous bag making process from winding is shown. However, a cylindrical blank having a body portion sealed in advance is prepared by a dedicated filling and sealing machine, and bottom sealing, filling, and top portion are performed. It is also possible to fold and form the bottom of the seal.

Example 2 The procedure of Example 1 was repeated, except that the side edges of the laminated paper were abutted to each other and the inner LDPEs were heated and welded together to form a body sticking part in the cylindrical body forming step in Example 1.
In the same manner as described above, a square bottom bag with a tear opening having the tapered top filled with the contents (nutritive drink) was manufactured as shown in FIG. (Length of side of tapered top closed end / length of long side of square base (side parallel to side of top closed end) = 100/50 = 1)
/0.5)

In the case of such a square bottom bag, since the cut surface of the laminated paper is not exposed inside the tubular body, a tape member for covering the cross section is unnecessary. Formation of such a palm-type body sticking portion is relatively simpler than performing the cross-sectional processing as shown in the first embodiment with a tape. Further, after the container is formed, the palm-shaped portion of the body sticking portion protrudes outward, but by forcibly dropping the protruding portion on the container wall surface, the appearance of the container is not inferior to that of Example 1. We were able to.

Example 3 Acid-resistant paperboard 200 g / m ^{2 was} coated on the back side (inside of the container) with 2 g
After forming a container, a perforation is formed at a position to be a cut-out portion on the tapered top after forming the container, and then the low-density polyethylene is also applied to the surface side (outside of the container) to a thickness of 40 μm. It was laminated. When sealing the top portion of the laminated sheet, the same as in Example 1 except that heat sealing was performed so that the sealing width surrounded the pouring portion 10 which is a non-sealing portion as shown in FIG. A square-bottomed bag having a tapered top filled with the contents was produced by a manufacturing method. This square bottom bag was easy to tear open from the perforated portion, and no leakage of the contents during normal handling was observed. In addition, the same evaluation as that of Example 1 could be obtained in the appearance of the container and the stability of maintaining the self-standing state.

As in the case of Examples 1 to 3, a multilayer sheet was used which had been provided with folds in advance from the four corners at the corner bottom of the container toward the tapered top when molded into a container. A square bottom bag was manufactured by the method described above. This square bottom bag has a sharp appearance with a shape in which the container wall is bent along the fold, and the sides produced in Examples 1 to 3 are formed with a smooth curve, and an elegant appearance. Was different from the container exhibiting.

[0045]

According to the present invention, the container formed by the multi-layer sheet mainly composed of paper of the present invention, which is tapered at the top and thin at the bottom and has a square bottom at the bottom, is free standing with the contents filled therein. Then, since the center of gravity is biased toward the bottom of the bag body, the bag body can be stably maintained in an independent state, and can be displayed neatly on the display shelf as a product. Further, since it is made of a material mainly composed of paper, there is little problem of incineration treatment, and the container is environmentally friendly in that it is recyclable.

[Brief description of the drawings]

FIG. 1 is a diagram showing a front surface, a side surface, and a bottom surface of a container in a self-standing state.

FIG. 2 is a view showing a container equipped with a tab.

FIG. 3 is a view of a container having a cutout different from that of FIG. 1;

FIG. 4 is a schematic process diagram illustrating a molding filling sealing process.

FIG. 5 is a diagram showing a layer configuration of a multilayer sheet cross-section covering tape (heat-welding resin tape).

FIG. 6 is a diagram showing a structure of a content take-out opening (tab attachment cross section).

FIG. 7 is a view showing a palm-sealing method of sealing the body sticking portion.

FIG. 8 is a diagram showing a method of sealing an envelope on a body sticking portion.

FIG. 9 is a diagram showing a spout mounting structure.

FIG. 10 is a view showing a step of forming a square bottom.

FIG. 11 is a view showing a rectangular container.

[Explanation of symbols]

 1. Square bottom container 2. 2. Side of closed end of top of container Square bottom 4. 4. Welding closed end (seal part) Heat seal edge 6. 6. Body sticking part 7. Perforation (cut line or tear line) Container body 9. Punched hole 10. Non-heat seal part 11. Winding of multilayer sheet 12. Opening means forming device 13. Tape supply device 14. Folding guide 15. Vertical sealing device 16. Horizontal sealing device 17. Filling pipe 18. Horizontal sealing device 19. Cutting device 20. Pillow bag 21. Molding apparatus 22. Taper guide 23. Square bottom forming jig 24. Thermal welding resin tape 25. Thermal welding resin layer 26. Layer of polyester or the like 27. Spout 28. Crease line

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E050 AA01 AA08 AB02 BA01 CC09 DC01 DC08 DC09 DG07 FB01 FB07 GA02 GA07 GB01 GC02 3E060 AA01 AB01 BA01 BC01 BC04 CE04 CE08 CE13 CE22 CF03 CF05 DA11 EA03 EA13 EA14 3E075 BA48 DD DE14 DE25 GA04 GA05

Claims (13)

[Claims] 1. One of a pair of welded closed ends of a pillow-type bag having a heat-sealing resin layer laminated on at least one surface of a paper layer and having the heat-sealing resin layer as an inner surface of the bag. Then, the welded closed end is squashed flat toward the other welded closed end, and a triangular portion formed at both ends of the flat surface is folded over a central rectangular portion to form a square bottom which is bonded. And the ratio of the length of the side of the top closed end, which is the other welded closed end, to the length of one side of the square base parallel to this side is 1.0: 0.7 to 1.0: 0. .5
A paper-made square bottom container having a tapered top. 2. The paper-made square having a tapered top according to claim 1, wherein the pillow-type bag is formed by welding a pair of closed ends and a waist portion in a jointed manner. Bottom container. 3. The pillow-type bag has a waist portion,
A heat-welding resin tape covering the entire cross-section of the side edge of the multilayer sheet exposed inside the cylindrical body formed by laminating the side end portions of the multilayered sheet that is folded into a tube vertically and pasting the envelope, 2. A paper bottom container having a tapered top according to claim 1, wherein the container is welded. 4. The square-bottomed container, after closing one end of the tubular body, is filled with the content from the remaining unclosed other end, and then, the unclosed other end is welded closed. Next, it is manufactured by forming a square bottom.
A paper-made square bottom container having a tapered top according to any one of claims 3 to 7. 5. The paper bottom container according to claim 1, wherein the bottom container has no crease in its body and has a rounded container appearance. . 6. The square-bottomed container has folds provided from four corners of the body corner-shaped bottom toward the top of the container,
The container has a rectangular appearance.
The paper-made square bottom container according to any one of the above. 7. A paper layer or a paper layer and another laminate layer when the paper layer further has another laminate layer, except for the innermost heat-welding resin layer of the multilayer sheet constituting the container. 7. A tear opening means comprising a perforated line formed therethrough and provided from the upper closed end of the container to the side wall of the filling container, according to any one of claims 1 to 6.
Item 8. The square bottom container according to the item. 8. An opening means comprising a punched hole and a tab member which covers the punched hole portion from the outside and is peelably adhered to the upper wall of the container body. The paper-made square bottom container according to any one of claims 1 to 6. 9. The punched hole penetrates a paper layer except for an innermost heat-sealing resin layer of the multilayer sheet constituting a container, or a paper when the paper layer further has another laminated layer. 9. The paper bottom container according to claim 8, wherein the container is formed so as to penetrate through the layer and the laminate layer. 10. The paper-made square bottom container according to claim 1, wherein a spout that can be opened and closed is mounted on the upper end of the container. 11. A multilayer sheet in which a heat-welding resin layer is laminated on at least one side of a paper layer, the heat-sealing resin layer is folded inside, and the side edges facing each other are welded in a palm-shape manner. Forming a cylindrical body having a pair of open ends, welding and closing one open end, filling the contents, and then welding and closing the other open end to close the contents filling pillow Forming a bag, squeezing the other closed end of the pillow bag in a flat shape toward the one closed end while holding one closed end of the pillow bag in a tapered fixing device; Forming a tapered top and a square bottom by folding and bonding a triangular portion formed at both ends of a flat surface onto a rectangular portion formed at a center portion, wherein the tapered top closure is characterized in that: The length of the edge side and the parallel Length ratio is 1.0: 0.7 ~
A method for producing a paper square bottom container having a tapered top of 1.0: 0.5. 12. The step of forming the tubular body comprises bending a multilayer sheet in which a heat-weldable resin is laminated on both sides or one side of a paper layer into a tubular shape with the heat-sealable resin layer inside, and facing the opposite end portion. 12. A paper having a tapered top according to claim 11, wherein said step is a step of applying an envelope to each other and welding a heat-welding resin tape so as to cover the entire edge of the multilayer sheet exposed inside the cylindrical body. Manufacturing method of square bottom container. 13. The flattening step wherein the step of forming the square bottom crushes one closed end of the pillow bag into a flat shape while holding the other closed end in a tapered fixing device. 13. A paper having a tapered top according to claim 11 or 12, characterized in that it is a step of folding and bonding triangular portions formed at both ends of the flat surface onto a rectangular portion formed at the center. Manufacturing method of square bottom container.