JP5456416B2 - Pouch container manufacturing equipment - Google Patents

Description

  The present invention relates to an apparatus for manufacturing a self-standing pouch container in which a bottom gusset folded in two is heat-sealed at a lower portion of a front surface of a body portion and a rear surface of a body portion facing each other.

  Conventionally, a pouch container in which one or more sheet materials are appropriately folded and joined to form a bag shape is widely known. Among such pouch containers, there is a so-called standing pouch in which a bottom gusset that is folded inward is joined to the lower part of the front part of the trunk part and the rear part of the trunk part. Such standing pouches are widely used in various products because of the convenience that products stored in containers can be displayed in a standing state.

  This standing pouch can be manufactured by the technique disclosed in, for example, Patent Documents 1-4. Although the techniques described in Patent Documents 1-4 are slightly different in detail, they are basically as follows. First, one or a plurality of sheet materials are folded, and a bottom gusset that is folded inward is arranged at the lower part of the front surface of the trunk portion and the rear surface of the trunk portion facing each other. Then, in that state, a heater having a shape corresponding to the seal portion, a heated seal bar, or the like was pressed against the front surface of the body portion and the rear surface of the body portion to heat seal both side edges of the body portion and the periphery of the bottom gusset. .

International Publication No. 2008/096392 Pamphlet JP 2004-249514 A JP 2004-338362 A JP 2001-206384 A

  That is, in the prior art, the sheet material is heated with the bottom gusset folded. In this case, in the vicinity of the bottom gusset, there is a problem that heat is not efficiently transferred because the four sheet materials are heated in an overlapping state. Also, there is a difference in thickness between the periphery of the bottom gusset where the four sheets of material overlap and the side edge of the body where the two sheets overlap, at the boundary between the periphery of the bottom gusset and both edges of the body A step will occur. Such a step has caused a difference in heat and pressure transmitted to both heat seal portions, and thus a difference in the degree of joining, and has caused bubbles in the step portion. In order to solve such a problem, Patent Documents 2-4 use a specially shaped seal bar. However, no matter how a specially shaped seal bar is used, the level difference itself does not disappear, and the problem of heat transfer efficiency cannot be solved. Therefore, it has been difficult to suitably manufacture a self-standing pouch container. Therefore, the same part is heat-sealed twice at another station, which leads to an increase in the size of the apparatus.

  Therefore, an object of the present invention is to provide a manufacturing apparatus that can more suitably manufacture a self-standing pouch container.

The pouch container manufacturing apparatus of the present invention is sandwiched between the front part of the trunk part and the rear part of the trunk part that are heat-sealed on both sides, and the lower part of the front part of the trunk part and the rear part of the trunk part in a state of being folded inward. A pouch container manufacturing apparatus comprising a bottom gusset, wherein at least a front sheet portion that constitutes at least the front surface of the body portion, the rear surface of the body portion, and the bottom gusset by folding one or more sheet materials while being folded A heat-seal portion between at least both side edges of the front surface of the body portion and both side edges of the rear surface of the body portion with respect to the sheet feeding member that forms the rear sheet portion and the bottom sheet portion and the folded and overlapped sheet material. A seal unit that forms a side seal part, and a bottom seal part that is a heat seal part between the peripheral edge of the bottom gusset and the lower edge of the front part of the trunk part and the rear part of the trunk part, Holding the bottom sheet part and the lower edge of the front sheet part and the lower edge of the bottom sheet part and the rear sheet part in a state where the folding of the bottom sheet part is released so that the bottom sheet parts do not overlap each other The bottom seal portion is formed by heating the entire periphery of the bottom sheet portion. In a preferred aspect, the front sheet portion, the rear sheet portion, and the bottom sheet portion are formed by folding a single sheet material that is continuously connected. In another preferred aspect, in the seal unit, the sheet material is in an upright state in which the bottom sheet portion is positioned below.
Another manufacturing device for a pouch container according to the present invention is sandwiched between the front part of the trunk part and the rear part of the trunk part, both sides of which are heat-sealed, and the lower part of the front part of the trunk part and the rear part of the trunk part in a state of being folded inward. A pouch container manufacturing apparatus comprising: a bottom gusset, and at least before forming the body front surface, the body rear surface, and the bottom gusset by folding and overlapping one or more sheet materials A heat sealing portion that includes at least both side edges of the front surface of the body portion and both side edges of the rear surface of the body portion with respect to the sheet material that forms the sheet portion, the rear sheet portion, and the bottom sheet portion, and the folded and stacked sheet material. A side seal part, and a bottom seal part that is a heat seal part between the peripheral edge of the bottom gusset and the lower edge of the front part of the trunk part and the rear part of the trunk part, Are the bottom sheet part and the lower edge of the front sheet part, and the lower edge of the bottom sheet part and the rear sheet part, respectively, in a state where the folding of the bottom sheet part is released so that the bottom sheet parts do not overlap each other The bottom seal part is formed by heating while being sandwiched, and the seal unit performs the side seal part forming process and the bottom seal part forming process at the same position .

In a preferred embodiment, prior Symbol seal unit, while sandwiching in a state of overlapping the front seat and the rear seat portion, and a pair of side blocks for heating both side edges of the said front seat and the rear seat, the folding A bottom block that heats the bottom sheet part released and the lower edge of the front sheet part and the lower edge of the rear sheet part stacked on the bottom sheet part in cooperation with the bottom surface of the side block; Prepare.

The pouch container manufacturing apparatus according to another aspect of the present invention includes a body front surface and a body rear surface whose both side edges are heat-sealed with each other, and a lower portion of the body front surface and the body rear surface in a state of being folded inward. A pouch container manufacturing apparatus comprising: a sandwiched bottom gusset; and a top gusset whose peripheral edge is heat-sealed to the upper edge of the trunk front surface and the trunk rear surface, while delivering one or more sheet materials Folding and stacking, at least the front part of the trunk part, the rear part of the trunk part, the bottom gusset and the front sheet part constituting the top gusset, the rear sheet part, the bottom sheet part and the top sheet part, and the folding means, A side seal portion that is at least a heat seal portion between both side edges of the front surface of the body portion and both side edges of the rear surface of the body portion, and a peripheral edge of the bottom gusset, the front surface of the body portion, and the rear surface of the body portion with respect to the stacked sheet material A seal unit that forms a bottom seal portion that is a heat seal portion with a lower edge, and a top seal portion that is a heat seal portion between the peripheral edge of the top gusset and the upper edges of the front surface and the rear surface of the body portion. The sealing unit is configured such that the bottom sheet portion is unfolded so that the bottom sheet portions do not overlap with each other, and the bottom sheet portion and the lower edge of the front seat portion, and the bottom sheet portion and the lower seat portion are below. The bottom seal part is formed by heating while pinching each edge, and heating is performed while pinching the upper edge of the top sheet part and the front sheet part and the upper edge of the top sheet part and the rear sheet part. A top seal portion is formed, and the seal unit performs a side seal portion forming process, a bottom seal portion forming process, and a top seal portion forming process at the same position . In this case, the seal unit is unfolded with a pair of side blocks that heat both side edges of the front seat portion and the rear seat portion while sandwiching the front seat portion and the rear seat portion in a stacked state. A bottom block that heats the bottom sheet portion and the lower edge of the front sheet portion and the lower edge of the rear sheet portion that are stacked on the bottom sheet portion in cooperation with the bottom surface of the side block; and the top sheet portion; It is desirable to provide a top block that heats the upper edge of the front sheet portion and the upper edge of the rear sheet portion that are stacked on the top sheet portion in cooperation with the upper surface of the side block. In addition, the seal unit is configured to press the upper edge of the top sheet portion and the front seat portion and the upper edge of the rear seat portion that are stacked on the top seat portion against the upper surface of the side block, It is also desirable to perform the forming process.

  According to the present invention, since the bottom seal portion is formed in a state where the folding of the bottom sheet portion is released, the self-standing pouch container having the bottom gusset can be more suitably manufactured.

It is a schematic block diagram of the manufacturing apparatus of the pouch container which is embodiment of this invention. It is a perspective view of the pouch container which is a manufacturing object. It is the upper side figure of a pouch container, a front view, and XX sectional drawing. It is a figure which shows the processing content in a ruled line formation unit and a punching unit. It is a figure which shows the processing content in a folding unit and a spout mounting unit. It is a figure which shows an example of the cancellation | release mechanism. It is a front view of the heating mechanism provided in the 1st seal unit. It is a perspective view of a top block. It is a perspective view of a side block. It is a perspective view of a bottom block. It is a figure which shows the flow of a sealing operation | work. It is a figure which shows the flow of a sealing operation | work. It is the upper side figure and side view of the sheet | seat material which passed the 1st seal unit. It is a figure which compares a prior art and this embodiment. It is a figure which shows an example of other embodiment. It is a figure which shows an example of other embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of an apparatus 10 for manufacturing a pouch container SP according to an embodiment of the present invention. The manufacturing apparatus 10 is an apparatus that manufactures a pouch container SP, particularly a self-standing pouch container SP (standing pouch) having a bottom gusset P3, by appropriately bending and joining sheet materials.

  Prior to detailed description of the manufacturing apparatus 10, first, the pouch container SP manufactured by the manufacturing apparatus 10 will be described. FIG. 2 is a perspective view of the pouch container SP manufactured by the pouch container SP manufacturing apparatus 10, and FIG. 3 is a top view, a front view, and an XX cross-sectional view of the pouch container SP. 2 and 3, the hatched portion is a heat seal portion in which the sheet materials are joined together by heat.

  As is well known, the pouch container SP is a container formed by laminating sheet materials in a bag shape, and is used for accommodating various items such as liquids and powders. The sheet material used for the pouch container SP is not particularly limited as long as it has heat sealability on one side and appropriate flexibility. Therefore, for example, it is possible to use a composite film obtained by laminating an inner layer made of polyethylene, ethylene-propylene copolymer, etc., which is rich in heat sealability, and an outer layer made of polyamide, polyester, etc., which are rich in printability and gas shielding properties. it can. Note that this material is merely an example, and a sheet material having a different material and thickness is appropriately selected according to the strength required for the pouch container SP, the nature of the contents accommodated in the pouch container SP, and the like. May be.

  The pouch container SP to be manufactured in this embodiment includes a trunk front surface P1 and a trunk rear surface P2 facing each other, a top gusset P4 joined to the upper edges of the trunk front surface P1 and the trunk rear surface P2, and a trunk front surface. A bottom gusset P3 joined to the lower edge of P1 and the trunk rear surface P2, and a spout Q joined to the approximate center of the top gusset P4.

  The body part front surface P1 and the body part rear surface P2 are joined to each other at both side edges to form a side seal part Ss. The top gusset P4 has a substantially octagonal shape when viewed from above, and a spout hole that allows the spout Q to pass therethrough is formed at the center thereof. The peripheral edge of the top gusset P4 is joined to the upper edges of the body front surface P1 and the body rear surface P2 to form a top seal portion St. The spout Q is a substantially cylindrical member that communicates the inside and outside of the pouch container SP, and is heat-sealed to the top gusset P4. Hereinafter, the heat seal portion between the spout Q and the top gusset P4 is referred to as “spout seal portion Sa”.

  The bottom gusset P3 is a portion that is sandwiched between lower portions of the trunk front surface P1 and the trunk rear surface P2 in a state of being folded inward. The peripheral edge of the bottom gusset P3 is joined to the lower edge of the trunk front surface P1 and the trunk rear surface P2 to form a substantially boat-shaped bottom seal portion Sb. Further, the bottom gusset P3 is formed with a substantially semicircular cutout c that coincides with each other in a folded state. By forming the notch c, the trunk front surface P1 and the trunk rear surface P2 can directly contact each other at the location. And the both side edges of the lower part of trunk | drum front surface P1 and trunk | drum rear surface P2 are joined via this notch part c, in other words, the contact part of trunk | drum front surface P1 and trunk | drum rear surface P2.

  By expanding the bottom gusset P3, the pouch container SP having such a configuration has a stable shape with a constant thickness at the bottom portion as shown in FIG. 2, and can stand on its own. Such a self-standing pouch container SP has been widely used since it is easy to display commodities and can increase the capacity, and many manufacturing techniques have been proposed. However, the conventional technology has a problem that the configuration of the manufacturing apparatus 10 for manufacturing the self-standing pouch container SP is complicated and large, and the quality of the obtained pouch container SP is low. In the manufacturing apparatus 10 of this embodiment, in order to solve such a problem, the configuration of the first seal unit 20 that forms the bottom seal portion Sb and the side seal portion Ss is special. Hereinafter, the manufacturing apparatus 10 of the pouch container SP according to the present embodiment will be described in detail.

  First, an overall configuration of the manufacturing apparatus 10 will be described with reference to FIG. In the manufacturing apparatus 10, a sheet roll R obtained by winding a sheet material M, which is a material of the pouch container SP, in a roll shape is set, and the sheet material M is continuously sent out by a sending mechanism (not shown).

  The delivered sheet material M is sequentially subjected to predetermined processing by the ruled line forming unit 12, the punching unit 14, the bending unit 16, the spout mounting unit 18, the first seal unit 20, the cutting unit 22, and the second seal unit 24. Applied. Then, the sheet material M that has been subjected to the plurality of processes is finally cut at a predetermined width interval by the cutting unit 26 and is output as separated individual pouch containers SP.

  Next, processing contents in each unit will be described. FIG. 4 is a diagram illustrating processing contents of the ruled line forming unit 12 and the punching unit 14. The ruled line forming unit 12 is a unit that continuously forms a plurality of ruled lines L1 to L8 on the sheet material M that has been sent out. This ruled line is formed to facilitate the downstream folding operation, and can be formed, for example, by bringing a thin roller into contact with the sheet material M.

  In the present embodiment, eight ruled lines L1 to L8 are formed at intervals in the width direction of the sheet material M. In a bending unit 16 and the like described later, the sheet material M is bent along the ruled lines L1 to L8. In addition, the range from one end to the 1st ruled line L1 among the sheet | seat materials M finally comprises the top gusset P4. Below, the part which comprises this top gusset P4 is called "the top sheet | seat part p4." Similarly, the range from the first ruled line L1 to the fourth ruled line L4 that finally constitutes the trunk front surface P1 is “front sheet part p1”, and finally the fourth ruled line L4 to the sixth ruled line that constitutes the bottom gusset P3. The range up to L6 is referred to as “bottom sheet portion p3”, and the range from the sixth ruled line L6 that finally constitutes the body rear surface P2 to the other end of the sheet material M is referred to as “rear sheet portion p2”. In this embodiment, an example in which ruled lines are formed on the sheet material in order to facilitate the folding process of the sheet material has been described. However, if the folding process can be easily performed, the formation of the ruled lines may be omitted entirely or partially. Also good. Specifically, for example, the formation of the ruled lines L3 and L7 in the present embodiment can be omitted, whereby the aesthetic appearance of the body portion of the pouch container can be improved.

  The punching unit 14 forms a spout hole H and a pair of joint holes h in the sheet material M on which ruled lines are formed. The spout hole H is a hole through which the spout Q is inserted. The spout holes H are sequentially formed in the top sheet portion p4 with an interval corresponding to the pouch container width W. The pair of joining holes h are holes that finally form the notch c. The pair of joining holes h are symmetrically located with respect to the fifth ruled line (the crease line when folding the bottom sheet in half) in the bottom sheet portion p3, and are pouched in the transport direction with respect to the spout hole H. It is formed at a position shifted by a distance (1/2 W) of about half of the container width W.

  FIG. 5 is a diagram showing the processing contents of the bending unit 16 and the spout mounting unit 18. The folding unit 16 bends the sheet material M sent from the upstream side in the width direction of the sheet material M along the ruled lines L1 to L8. Specifically, the bottom sheet part p3 folded inward along the fifth ruled line L5 is bent so as to be sandwiched between the lower parts of the front sheet part p1 and the rear sheet part p2 facing each other. Further, it is also folded along the first ruled line L1, the second ruled line L2, and the eighth ruled line L8, and is folded so that the upper part of the front and rear sheet parts p1, p2 and the top sheet part p4 overlap. FIG. 5 illustrates a state in which the top sheet portion p4 is erected after the top sheet portion p4 is overlaid on the front and rear seat portions p1 and p2. The folding unit 16 and a delivery mechanism (not shown) fold and overlap the sheet material M while feeding it, so that at least the front sheet constituting the trunk front face P1, the trunk rear face P2, the bottom gusset P3, and the top gusset P4. It functions as a feeding means for forming the part p1, the rear sheet part p2, the bottom sheet part p3, and the top sheet part p4.

  The spout mounting unit 18 inserts the cylindrical part Qa of the spout Q into the spout hole H formed in the top sheet part p4, and the flange part Qb protruding outward from the lower end of the cylindrical part Qa to the top sheet part p4. Heat seal. That is, the spout mounting unit 18 raises the top sheet portion p4 in which the spout hole H is formed, then the spout so that the cylindrical portion Qa protrudes outward and the flange portion Qb contacts the inner surface of the top sheet portion p4. Q is inserted into the spout hole H. And after returning the top sheet | seat part p4 which stood up as shown in FIG. 6 to horizontal, the collar part Qb is heat-sealed to the periphery of the spout hole H in the top sheet | seat part p4, and the spout Q is mounted to the sheet material M. .

  Thereafter, the sheet material M on which the spout Q is mounted is sent to the first seal unit 20. The first seal unit 20 is a part that performs a heat sealing process on the sheet material M that has been sent out to form a bottom seal part Sb, a side seal part Ss, and a top seal part St. The first seal unit 20 includes a folding release mechanism, an adhesion mechanism, a cooling mechanism, and the like.

  The folding release mechanism is a mechanism that releases the folding of the bottom sheet portion p3 by releasing the folding of the bottom sheet portion p3, and is provided upstream of the bonding mechanism that actually performs the heat sealing operation. The folding release mechanism is not particularly limited as long as the sheet material M can be bent along the third ruled line L3 and the seventh ruled line L7 so as to release the folding of the bottom sheet portion p3. Therefore, for example, the lower end of the front sheet part p1 and the lower end of the rear sheet part p2 may be configured by a pair of suction members that move in the separation direction while sucking and holding. Further, as a simpler configuration, for example, as shown in FIG. 6, a plate member 28 having an upper surface that contacts the bottom surface of the bottom sheet portion p <b> 3 that has been unfolded may be used. In this case, if the sheet material M is set in a state where the bottom sheet portion p3 is expanded so that the bottom sheet portion p3 is in contact with the upper surface of the plate material, the subsequent sheet material M is also naturally The folding is released in the vicinity of the plate material 28. With this folding release mechanism, the sheet material M has a substantially I-shape when viewed from the front.

  The unfolded sheet material M is sent to the heating mechanism in that state. The heating mechanism is a mechanism for heat-sealing the sheet material M by heating while sandwiching and pressing each part of the sheet material M. FIG. 7 is a front view of the heating mechanism, and FIGS. 8 to 10 are perspective views of the top block 30, the side block 32, and the bottom block 34 that constitute the heating mechanism, respectively.

  The heating mechanism moves the top block 30 and the side block 32 that are vertically opposed to each other, the pair of side blocks 32 that are opposed to each other between the top block 30 and the side block 32, and the plurality of blocks. A moving mechanism.

  The top block 30 cooperates with the upper surface of the side block 32 to heat the top sheet part p4 and the upper edge of the front sheet part p1 and the rear sheet part p2 superimposed on the top sheet part p4. It is a block. Three protrusions 40 having a shape corresponding to the top seal portion St (substantially octagonal in this embodiment) are arranged on the bottom surface of the top block 30 in the sheet material conveyance direction. The protrusion 40 has a built-in heater so that the sheet portion in contact with the protrusion 40 can be heat sealed. In addition, an escape hole 42 for avoiding interference between the spout Q and the top block 30 is formed in the central portion of each octagon.

  The side block 32 includes a top surface facing the top block 30, a facing surface facing the paired side block 32, and a bottom surface facing the bottom block 34. On the upper surface, three protrusions 50 having a shape in which the top seal portion St is divided into two in the front-rear direction are arranged in the sheet material conveyance direction. In other words, when the two opposing side blocks 32 are close to each other, the top surface of the two side blocks 32 has a shape corresponding to the top seal portion St, in other words, the protrusion 40 formed on the top block 30. Protrusions having the same shape are configured. When the top seal portion St is formed, the top sheet portion p4 and the front and rear seat portions p1, p2 are sandwiched and heated by the protrusion 50 on the top surface of the side block 32 and the protrusion 40 on the bottom surface of the top block 30.

  Four protrusions 48 are formed on the opposing surface of the side block 32 in the sheet material conveying direction so as to cross the side block 32 in the vertical direction. The four protrusions 48 are formed at positions and sizes corresponding to the side seal portions Ss, and the arrangement interval of the protrusions 48 is substantially equal to the width of the pouch container SP. Of the four protrusions 48, the width of the protrusion 48 provided on the most upstream side and the downstream side is equal to the width of one side seal portion Ss, and the width of the two protrusions 48 provided therebetween is It is equal to the width of two side seal portions Ss. A heater is also built in the protrusion 48 so that the sheet portion in contact with the protrusion 48 can be heat sealed. When the side seal portion Ss is formed, the protrusions 48 of the pair of side blocks 32 facing each other are heated while sandwiching the front seat portion p1 and the rear seat portion p2.

  On the bottom surface of the side block 32, three protrusions 52 having a shape in which the bottom seal portion Sb is divided into two parts in the front-rear direction are arranged in the sheet material conveyance direction. In other words, when the two opposing side blocks 32 come close to each other, the protrusion 48 having a shape corresponding to the bottom seal portion Sb is formed on the bottom surface of the two side blocks 32. When the bottom seal portion Sb is formed, the bottom sheet portion p3 and the front and rear seat portions p1, p2 are sandwiched between the protrusion 52 on the bottom surface of the side block 32 and the protrusion 56 on the top surface of the bottom block 34, and heated.

  The bottom block 34 cooperates with the bottom surface of the side block 32 to heat the bottom sheet portion p3 and the lower edges of the front and rear sheet portions p1 and p2 overlapped with the periphery of the bottom sheet portion p3. It is. On the bottom surface of the bottom block 34, a projection 56 having a shape corresponding to the bottom seal portion Sb is formed. More specifically, the protrusion 56 has a shape in which three substantially hexagons are arranged between two straight lines that are long in the transport direction. The protrusion 56 has a built-in heater so that the sheet portion in contact with the protrusion 56 can be heat sealed. In addition, substantially triangular recesses 58 are formed at positions on both sides of the substantially hexagonal protrusion 56 and corresponding to the notch c. By forming the recess 58, the periphery of the notch c is prevented from coming into contact with the projection 56 (heat sealed).

  The moving mechanism is a mechanism for moving these three types of blocks. More specifically, the moving mechanism moves the top block 30 and the bottom block 34 up and down. Further, the moving mechanism can move the pair of side blocks 32 in a direction approaching or separating from each other. Since such a moving mechanism can be configured by using a well-known technique, a detailed description thereof is omitted here.

  A flow of the sealing work in the first seal unit 20 having such a configuration will be described with reference to FIGS. 11 and 12. As shown in FIG. 11A, the sheet material M sent out in the unfolded state has a substantially I shape when viewed from the front. At this time, both the top block 30 and the bottom block 34 stand by at a position separated from the sheet material M. Further, while the side block 32 is separated from the front sheet part p1 and the rear sheet part p2, the side block 32 stands by at a position where the facing distance is equal to or less than the width of the bottom sheet part p3 and the top sheet part p4. Therefore, in this state, the tips of the bottom sheet portion p3 and the top sheet portion p4 slightly overlap the bottom surface and the top surface of the side block 32.

  Subsequently, as illustrated in FIG. 11B, the top block 30 is lowered, and the upper edges of the top sheet portion p <b> 4 and the front and rear seat portions p <b> 1 and p <b> 2 are pressed against the upper surface of the side block 32. By this pressing, the height position of the sheet material M is adjusted to the specified position. The pressing force only needs to be such that the height can be adjusted, and is preferably small enough to allow movement of the side block 32 described later.

  Subsequently, as shown in FIG. 11C, the pair of side blocks 32 are moved in directions close to each other, and the pair of side blocks 32 sandwich and pressurize the front and rear seat portions p <b> 1 and p <b> 2. In this state, heating of the protrusion 48 provided on the side surface is started. By this heating, a portion of the sheet material M that comes into contact with the protrusion 48, that is, a portion corresponding to the side seal portion Ss is heat sealed.

  Further, thereafter, as shown in FIG. 12A, the bottom block 34 is raised, and in cooperation with the bottom surface of the side block 32, the peripheral edge of the bottom seat portion p3 and the lower edges of the front and rear seat portions p1, p2 are sandwiched. Pressurize. In addition, the top block 30 is further lowered to clamp and press the peripheral edge of the top sheet portion p4 and the upper edges of the front and rear seat portions p1, p2 in cooperation with the upper surface of the side block 32. And if it will be in that state, the heating of protrusion 40,56 of the bottom block 34 and the top block 30 will also be started. By this heating, a portion of the sheet material M that contacts the protrusions 40, 56, that is, a portion corresponding to the top seal portion St and a portion corresponding to the bottom seal portion Sb are heat sealed.

  And if heating for a fixed time is completed, as shown in FIG.12 (b), all the blocks will be spaced apart from the sheet material M, and the said sheet material M will be sent to a cooling mechanism. In the cooling mechanism, the heat-sealed portion is cooled.

  After cooling, the bottom sheet portion p3 of the sheet material M is folded again in two. FIG. 13 is a top view and a side view of the sheet material M that has passed through the first seal unit 20. As shown in FIG. 13, the sheet material M that has passed through the first seal unit 20 is in a state in which a top seal portion St, a side seal portion Ss, and a bottom seal portion Sb are formed.

  The sheet material M is subsequently sent to the cutting unit 22. In the excision unit 22, unnecessary portions are excised so that the portion corresponding to the top gusset P4 has a substantially octagonal shape. Specifically, in FIG. 13, a substantially triangular portion k surrounded by a thick line is cut off. Thereafter, the sheet material M is sent to the second seal unit 24 with the bottom sheet portion p3 folded.

  In the second seal unit 24, the vicinity of the joint hole h is heated while being sandwiched by a block body incorporating a heater. And thereby, the front sheet | seat part p1 and the back sheet | seat part p2 are heat-sealed through the said joint hole h. If the sheet passes through the second seal unit 24, finally, the sheet material M is sent to the cutting unit 26. In the cutting unit 26, the continuous sheet material M is positioned at the position corresponding to the side edge of the trunk portion of the pouch container SP, more specifically, the center position of the side seal portion Ss (the position indicated by the one-dot chain line in FIG. 13). ). By this cutting, individual pouch containers SP separated from each other are formed.

  The above is the flow of manufacturing the pouch container SP. Here, as is apparent from the above description, in the present embodiment, the pressure heating for forming the bottom seal portion Sb is performed in a state where the folding of the bottom sheet portion p3 is released, in other words, between the bottom sheet portions p3. Do not overlap. The reason why pressure heating is performed in this state will be described with reference to FIG.

  Conventionally, when the bottom seal portion Sb is formed, the bottom sheet portion p3 is folded in two as shown in FIG. In this case, the portion corresponding to the bottom seal portion Sb is composed of a total of four sheet portions, ie, the front sheet portion p1, the folded bottom sheet portion p3, and the rear sheet portion p2, and the thickness t1 is determined by the sheet material. It is for M 4 sheets. On the other hand, in the portion corresponding to the side seal portion Ss above the bottom sheet portion p3, only the two sheet portions of the front sheet portion p1 and the rear sheet portion p2 overlap, and the thickness t2 is determined by the sheet material. It is for M 2 sheets. In other words, a difference in thickness corresponding to the two sheet materials M occurs between the portion corresponding to the bottom seal portion Sb and the portion corresponding to the side seal portion Ss. Such a difference in thickness leads to a difference in pressure and heat amount transmitted to the sheet material M, and as a result, a reduction in bonding quality. In particular, at the boundary portion between the bottom seal portion Sb and the side seal portion Ss where there is a level difference corresponding to two sheet materials M, it may remain as a bubble without being partially joined. It is known that such bubbles cause a decrease in strength of the seal portion.

  In addition, when the four sheet portions are stacked, the front sheet portion p1 or the rear sheet portion p2 is always interposed between the bottom sheet portion p3 and the heater (such as a seal bar). In this case, a decrease in heat transfer efficiency, a difference in the amount of heat transferred between the front and rear sheet portions p1, p2, and the bottom sheet portion p3, etc. are caused. These reductions in transmission efficiency and non-uniformity in the amount of heat transferred also lead to a reduction in bonding quality.

  Therefore, many techniques for forming the bottom seal portion Sb have been conventionally proposed. For example, the bottom seal part Sb and the side seal part Ss are sandwiched and heated by separate members having different thicknesses or members having a step, thereby absorbing a difference in thickness between the two and preventing the air from being caught. It has been proposed to use a seal bar. However, in any of these techniques, the difference in thickness between the bottom seal portion Sb and the side seal portion Ss cannot be eliminated, and the bottom sheet portion p3 cannot be brought close to the heater. The difference in pressure and heat quantity transmitted to the sheet material M as described above could not be effectively reduced.

  On the other hand, in the present embodiment, as described above and as shown in FIG. 14B, the bottom seal portion Sb and the side seal portion Ss are heat-sealed in a state where the folding of the bottom sheet portion p3 is released. In this case, a step does not occur at the boundary portion between the bottom seal portion Sb and the side seal portion Ss, and various problems due to the step can be reduced.

  Further, the thickness t3 of the bottom seal portion Sb is equal to two sheet materials, which is thinner than the conventional one, and the bottom sheet comes into direct contact with the heater (protrusion incorporating the heater). As a result, the heat transfer efficiency is improved, the amount of heat received by the bottom sheet portion p3 and the front and rear sheet portions p1, p2 can be made uniform, and a better heat seal can be achieved. Moreover, it can contribute to the effective utilization of heat by using the side block upper surface and lower surface.

  Further, in the present embodiment, the side seal portion Ss, the bottom seal portion Sb, and the top seal portion St are formed at the same position in parallel. As a result, each seal portion can be formed in a shorter time than the conventional technique in which the seal portions are individually formed, and the size and cost of the entire apparatus can be reduced.

  That is, according to the present embodiment, the self-standing pouch container SP provided with the bottom gusset P3 can be more suitably manufactured. In addition, all the structures demonstrated above are examples, and if the bottom seal | sticker part Sb is formed in the state which canceled folding of the bottom sheet | seat part p3, another structure will be changed. Also good.

  For example, in this embodiment, heat sealing is performed in a state where the bottom sheet portion p3 is spread out substantially horizontally. However, if the bottom sheet portions p3 do not overlap each other, as shown in FIG. Heat sealing may be performed in a state where the sheet portion p3 is expanded in a substantially inverted V shape. Further, if the target pouch container SP includes the bottom gusset P3, the top gusset P4 or the pouch container SP without the spout Q may be used. Furthermore, in the present embodiment, the bottom sheet portion p3 and the front and rear sheet portions p1, p2 are formed by bending one sheet material M, but two or more sheet materials M may be formed in an overlapping manner. For example, as shown to Fig.15 (a), you may comprise the front sheet | seat part p1, the bottom sheet | seat part p3, and the back sheet | seat part p2 with the respectively separate sheet | seat material M which isolate | separated. Moreover, as shown in FIG.15 (b), you may comprise the front sheet | seat part p1, the bottom sheet | seat part p3, the back sheet | seat part p2, and the top sheet | seat part p4 by the separate sheet | seat material M which isolate | separated all. As shown in FIG. 16, the four long sheet materials M1 to M4 are sent out in parallel while being folded and overlapped as shown in FIG. That's fine.

  Further, in the present embodiment, in order to adjust the height position of the sheet material M, the top sheet portion p4 is first pressed against the upper surface of the side block 32 by the top block 30, but this step is not essential. Therefore, the sheet material M may be sandwiched between the pair of side blocks 32 before the top block 30 is lowered. Moreover, in this embodiment, after starting the pressurization heating of the side seal part Ss, the pressurization heating of the bottom seal part Sb and the top seal part St is started, However, These order may be changed suitably. Good.

  DESCRIPTION OF SYMBOLS 10 Manufacturing apparatus, 12 Ruled line formation unit, 14 Punching unit, 16 Folding unit, 18 Spout mounting unit, 20 First seal unit, 22 Cutting unit, 24 Second seal unit, 26 Cutting unit, 30 Top block, 32 Side block, 34 Bottom block, H spout hole, h joint hole, M sheet material, p1 front sheet part, p2 rear sheet part, p3 bottom sheet part, p4 top sheet part, Q spout, Sa spout seal part, Sb bottom seal part, SP Pouch container, Ss side seal part, St top seal part, P1 trunk front face, P2 trunk rear face, P3 bottom gusset, P4 top gusset.

Claims (8)

A pouch container comprising: a body front surface and a body rear surface whose side edges are heat-sealed with each other; and a bottom gusset sandwiched between the body front surface and the body rear surface in a folded state in two. Manufacturing equipment,
Sending means for forming at least the front part of the trunk part, the rear part of the trunk part, and the bottom gusset, the rear sheet part, and the bottom sheet part by folding and overlapping one or more sheet materials,
A side seal portion that is at least a heat seal portion between both side edges of the front surface of the body portion and both side edges of the rear surface of the body portion, and a peripheral edge of the bottom gusset, the front surface of the body portion, and the body. A bottom seal part that is a heat seal part with the lower edge of the rear part of the part, and a seal unit that forms
The seal unit has a bottom sheet part and a lower edge of the front sheet part, and a bottom edge of the bottom sheet part and the rear sheet part in a state in which the folding of the bottom sheet part is released so that the bottom sheet parts do not overlap each other. The bottom seal part is formed by heating the entire periphery of the bottom sheet part while sandwiching the
An apparatus for manufacturing a pouch container.   An apparatus for manufacturing a pouch container according to claim 1,
  The said front sheet | seat part, a back sheet | seat part, and a bottom sheet | seat part are formed by folding the sheet material connected continuously, The manufacturing apparatus of the pouch container characterized by the above-mentioned.   An apparatus for manufacturing a pouch container according to claim 1 or 2,
  In the sealing unit, the sheet material is in an upright state in which the bottom sheet portion is positioned below, and the pouch container manufacturing apparatus is characterized in that: A pouch container comprising: a body front surface and a body rear surface whose side edges are heat-sealed with each other; and a bottom gusset sandwiched between the body front surface and the body rear surface in a folded state in two. Manufacturing equipment,
Sending means for forming at least the front part of the trunk part, the rear part of the trunk part, and the bottom gusset, the rear sheet part, and the bottom sheet part by folding and overlapping one or more sheet materials,
A side seal portion that is at least a heat seal portion between both side edges of the front surface of the body portion and both side edges of the rear surface of the body portion, and a peripheral edge of the bottom gusset, the front surface of the body portion, and the body. A bottom seal part that is a heat seal part with the lower edge of the rear part of the part, and a seal unit that forms
The seal unit has a bottom sheet part and a lower edge of the front sheet part, and a bottom edge of the bottom sheet part and the rear sheet part in a state in which the folding of the bottom sheet part is released so that the bottom sheet parts do not overlap each other. The bottom seal part is formed by heating while sandwiching each ,
The seal unit performs the formation process of the side seal part and the formation process of the bottom seal part at the same position.
An apparatus for manufacturing a pouch container. An apparatus for manufacturing a pouch container according to claim 4 ,
The seal unit is
A pair of side blocks that heat both side edges of the front seat portion and the rear seat portion while sandwiching the front seat portion and the rear seat portion in a stacked state,
A bottom block that heats the bottom sheet part that has been unfolded and the lower edge of the front sheet part and the lower edge of the rear sheet part that overlap the bottom sheet part in cooperation with the bottom surface of the side block;
An apparatus for manufacturing a pouch container. The body front and the back of the body, both sides of which are heat-sealed, the bottom gusset sandwiched between the front of the body and the back of the body in a folded state in two, and the periphery of the body front And a top gusset heat-sealed at the upper edge of the rear surface of the trunk, and a pouch container manufacturing apparatus comprising:
By folding one or more sheet materials while being folded and stacked, at least a front sheet portion, a rear sheet portion, a bottom sheet portion, and a top sheet portion constituting the body front surface, the body rear surface, the bottom gusset, and the top gusset A delivery means to form;
A side seal portion that is at least a heat seal portion between both side edges of the front surface of the body portion and both side edges of the rear surface of the body portion, and a peripheral edge of the bottom gusset, the front surface of the body portion, and the body. A seal unit that forms a bottom seal part that is a heat seal part with the lower edge of the rear part of the rear part, and a top seal part that is a heat seal part of the peripheral edge of the top gusset and the upper edge of the front part of the trunk part and the rear part of the trunk part And
The seal unit has a bottom sheet part and a lower edge of the front sheet part, and a bottom edge of the bottom sheet part and the rear sheet part in a state in which the folding of the bottom sheet part is released so that the bottom sheet parts do not overlap each other. By forming the bottom seal part by heating while sandwiching each, and heating while sandwiching the upper edge of the top sheet part and the front sheet part and the upper edge of the top sheet part and the rear sheet part, respectively Forming a top seal ,
The seal unit performs a side seal part forming process, a bottom seal part forming process, and a top seal part forming process at the same position.
An apparatus for manufacturing a pouch container. An apparatus for manufacturing a pouch container according to claim 6 ,
The seal unit is
A pair of side blocks that heat both side edges of the front seat portion and the rear seat portion while sandwiching the front seat portion and the rear seat portion in a stacked state,
A bottom block that heats the bottom sheet part that has been unfolded and the lower edge of the front sheet part and the lower edge of the rear sheet part that overlap the bottom sheet part in cooperation with the bottom surface of the side block;
A top block that heats the top sheet part and the upper edge of the front sheet part and the upper edge of the rear sheet part that are stacked on the top sheet part in cooperation with the upper surface of the side block; and
An apparatus for manufacturing a pouch container. An apparatus for manufacturing a pouch container according to claim 7 ,
The seal unit presses the top sheet portion and the upper edge of the front sheet portion and the upper edge of the rear sheet portion that are stacked on the top sheet portion against the upper surface of the side block, and then forms the side seal portion. A device for manufacturing a pouch container.

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