JP2011006140A - Bag-making and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag-making and packaging machine capable of adjusting the amount of gas in a bag effectively.SOLUTION: The bag-making and packaging machine manufactures the bag in which an object to be packaged is filled by laterally sealing a tubular film Fc, and includes a second gas supply device, a lateral seal deice, and a first gas supply device. The second gas supply device supplies a gas to the tubular film Fc. The lateral seal device laterally seals the tubular film Fc to form an upper seal portion S2 and a lower seal portion S1 in the tubular film Fc. After the lower seal portion S1 is formed, the first gas supply device blows the gas in an opening direction of the tubular film Fc to adjust the amount of the gas filling the bag.

Description

  The present invention relates to a bag making and packaging machine, and more particularly to a bag making and packaging machine for producing a bag filled with an article to be packaged.

  2. Description of the Related Art Conventionally, there is a bag making and packaging machine that manufactures a bag by forming a sheet-like packaging material into a cylindrical shape and sealing both ends in a state in which an article to be packaged such as food is filled. For example, in a vertical bag making and packaging machine, a sheet-like packaging material is formed into a cylindrical shape by a molding device, and then both edges of the cylindrical packaging material that overlap vertically are heat-sealed, and the inside of the cylindrical packaging material The space is filled with an article to be packaged. When the article to be packaged is filled, the upper and lower end portions of the cylindrical packaging material which are to be one bag are sequentially sealed horizontally, and the upper seal portion is in a state where the article to be packaged is in the cylindrical packaging material. And a lower seal portion are formed. Specifically, a horizontal seal is applied across the upper end portion of a bag and the lower end portion of a subsequent bag, and immediately thereafter (or simultaneously), the center of the seal portion is cut up and down by a cutter. An upper seal portion and a lower seal portion are formed on the cylindrical packaging material. By repeating such an operation, the vertical bag making and packaging machine continuously manufactures bags filled with articles to be packaged.

  In this type of bag making and packaging machine, as in the bag making and packaging machine disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2002-179909), air is supplied into the tube of the molding apparatus or exhausted from the inside of the tube. There is something that can be done.

  A product (bag) manufactured by a bag making and packaging machine is often transported to a boxing device via an inspection line or the like, but the size of the bag may be a problem in the boxing operation. If a bag is made with a large amount of gas in the bag, the bag will be manufactured in a considerably swollen state, but it is desirable that the bag be manufactured to an appropriate size for boxing and sales at stores. .

  However, depending on the production speed of the bag, it is conceivable that a conventional bag making and packaging machine cannot sufficiently cope with it.

  The subject of this invention is providing the bag making packaging machine which can adjust the gas amount in the bag manufactured efficiently.

  A bag making and packaging machine according to the present invention is a bag making and packaging machine for producing a bag filled with an article to be packaged by laterally sealing a cylindrical packaging material, comprising a gas supply device, a lateral sealing device, A gas amount adjusting device. The gas supply device supplies gas to the cylindrical packaging material. The horizontal sealing device laterally seals a cylindrical packaging material, and forms an upper seal portion and a lower seal portion on the cylindrical packaging material. After the lower seal portion is formed, the gas amount adjusting device blows out gas toward the opening direction of the cylindrical packaging material and adjusts the amount of gas filled in the bag.

  In the bag making and packaging machine according to the present invention, when the gas is blown out toward the opening direction of the cylindrical packaging material, the gas inside the cylindrical packaging material that becomes the bag also moves in the opening direction. Reduce the swelling of the packaging material.

  Thereby, the gas quantity in a bag can be adjusted efficiently.

  Moreover, in the bag making packaging machine which concerns on this invention, it is preferable to make temperature of the gas supplied by a gas supply apparatus lower than environmental temperature. As a result, the amount of gas in the bag can be adjusted more efficiently.

  Moreover, it is preferable that the bag making packaging machine according to the present invention further includes a molded member. The molding member is for molding a sheet-shaped packaging material into a cylindrical shape, and is disposed in the internal space of the cylindrical packaging material. In this case, it is preferable that the gas amount adjusting device has a blowout port for blowing out the gas. The air outlet can be provided in the molding member or in the vicinity of the molding member.

  The bag making and packaging machine according to the present invention can efficiently adjust the amount of gas in the bag.

It is an external appearance perspective view of the bag making packaging machine which concerns on one Embodiment of this invention. It is a side schematic diagram of the principal part of a bag making packaging machine. It is a schematic perspective view of the principal part of a bag making packaging machine. It is a fragmentary sectional view of a tube. It is the schematic of a 1st gas supply apparatus and a 2nd gas supply apparatus. It is a figure which shows operation | movement of a horizontal sealing mechanism. It is a figure which shows the state of the external shape of a cylindrical film, the flow of the gas blown out from a blower outlet, and the motion of a sealing jaw. It is a control block diagram of a bag making packaging machine.

<Overall configuration>
1 and 2 show the overall configuration of a bag making and packaging machine 1 according to an embodiment of the present invention. The bag making and packaging machine 1 is a machine for bagging articles C having a small specific gravity such as potato chips to produce a bag-packed product P (bag B). The bag making and packaging machine 1 is mainly composed of a bag making and packaging unit 5 that is a main part that packs an article C and a film supply unit 6 that supplies a film F to be a bag B to the bag making and packaging unit 5. ing. In the bag making and packaging machine 1, operation switches 7 are arranged on the front surface of the bag making and packaging unit 5. Further, the bag making and packaging machine 1 is provided with an operation display 8 indicating an operation state at a position that can be visually recognized by a user who operates the operation switches 7.

<Configuration of each unit>
Next, the structure of the unit contained in the bag making packaging machine 1 is demonstrated.

(1) Film supply unit The film supply unit 6 is a unit which supplies the sheet-like film F with respect to the shaping | molding mechanism 13 of the bag making packaging unit 5 mentioned later. The film supply unit 6 is provided adjacent to the bag making and packaging unit 5. A film roll around which the film F is wound is set in the film supply unit 6. The film F is fed out from the film roll and supplied to the forming mechanism 13.

(2) Bag making and packaging unit The bag making and packaging unit 5 mainly includes a forming mechanism 13, a first gas supply device 70, a second gas supply device 75, a pull-down belt mechanism 14, a vertical seal mechanism 15, and a horizontal A sealing mechanism (lateral sealing device) 16 and a support frame 12 that supports these mechanisms are configured. Hereinafter, the bag making and packaging unit 5 will be described with reference to FIGS.

(2-1) Forming mechanism The forming mechanism 13 forms the sheet-like film F sent from the above-described film supply unit 6 into a tubular film Fc. As shown in FIGS. 2 and 3, the forming mechanism 13 includes a tube 31 and a former 32.

〔tube〕
The tube 31 is a cylindrical member extending in the vertical direction, and has openings at the upper and lower ends. The tube 31 is disposed in the central opening portion of the top plate 29 of the support frame 12 and is integrated with the former 32 via a bracket (not shown).

  As shown in FIG. 4, the tube 31 includes a cylindrical main body 311 and a funnel-shaped opening 312 extending from the upper end of the main body 311. As shown in FIG. 3, the articles weighed by the combination weighing machine 2 (see FIG. 1) are thrown in from the upper end opening of the funnel-shaped opening 312 and fall through the main body 311.

  A first connection pipe 33 connected to a first gas supply device 70 described later and a second connection pipe 34 connected to a second gas supply device 75 are attached to the side surface near the upper end of the main body 311. . Further, an exhaust pipe 43 for exhausting excess gas in the tubular film Fc is connected to the side surface of the main body 311. The exhaust pipe 43 is located below the second connection pipe 34.

  The main body 311 of the tube 31 is a double tube (partially a triple structure). FIG. 4 shows a cross-sectional view of the main body 311 of the tube 31. The back side of the main body 311 has a double tube structure, and a first flow path P1 is formed between the first tube T1 and the third tube T3. The front side of the main body 311 also has a double tube structure. A second flow path P2 is formed between the first tube T1 and the third tube T3 in the upper portion, and the first tube T1 and the third tube are formed in the lower portion. A third flow path P3 is formed between the pipe T3. In addition, a second member T2 having a diameter larger than that of the first tube T1 and smaller than that of the third tube T3 and having a semi-cylindrical cross section is disposed in the central portion on the front side of the main body 311.

  The 1st pipe | tube T1 forms the flow path (internal space of the main-body part 311 of the tube 31) P0 for guiding the articles | goods C falling from the combination weighing machine 2 in the cylindrical film Fc. Further, blowout ports O1, O2, and O3 that connect a first flow path P1, a second flow path P2, and an internal space P0, which will be described later, are formed in the first pipe T1. The blower outlet O1 communicates with the first flow path P1 through the first auxiliary flow path P1a. Moreover, the blower outlet O2 is connected to the 2nd flow path P2 via the 2nd auxiliary flow path P2a. Furthermore, the blower outlet O3 communicates with the second flow path P2 via the third auxiliary flow path P2b.

  The blower outlet O <b> 1 is provided in the vicinity of the lower end portion of the tube 31. The first flow path P1 flows gas downward, but the first auxiliary flow path P1a flows gas upward toward the outlet O1. Therefore, the gas blown out from the blower outlet O1 is blown out obliquely upward. Here, two sets of the first auxiliary flow path P <b> 1 a and the outlet O <b> 1 are provided on the back side of the main body 311 of the tube 31.

  Three outlets O2 are provided at equal intervals in the circumferential direction at a relatively upper portion of the main body 311 of the tube 31. The second auxiliary flow path P2a is inclined by a predetermined angle toward the outlet O2. Specifically, the second auxiliary flow path P2a is inclined such that one end connected to the internal space of the tubular film Fc is located obliquely below the one end connected to the second flow path P2.

  Three blower outlets O3 are provided at equal intervals in the circumferential direction at a relatively upper portion of the main body portion 311 of the tube 31. The third auxiliary flow path P2b is inclined by a predetermined angle toward the blower outlet O3. Specifically, the third auxiliary flow path P2b is inclined such that one end connected to the internal space of the tubular film Fc is located obliquely below the one end connected to the second flow path P2.

  The first flow path P1 takes in an inert gas from a first gas supply pipe 72a described later through the first connection pipe 33, and guides the gas downward. Then, the gas is blown upward from the blower outlet O1 through the first auxiliary flow path P1a from the first flow path P1.

  The second flow path P2 is a flow path different from the first flow path P1, and takes in an inert gas from a second gas supply pipe 77a, which will be described later, through the second connection pipe 34, and guides the gas downward. . Then, the gas is blown downward from the outlets O2 and O3 from the second passage P2 through the second auxiliary passage P2a and the third auxiliary passage P2b.

  The third flow path P3 is an exhaust flow path for taking in the gas in the cylindrical packaging material Fc from the space below the lower end of the tube 31 and discharging it outside the apparatus. An exhaust valve 78a is provided between the exhaust fan 78 and the exhaust pipe 43 (see FIG. 5), and exhaust is performed when the exhaust valve 78a is open.

[Former]
The former 32 is disposed so as to surround the tube 31. The shape of the former 32 is such that the sheet-like film F sent from the film supply unit 6 is formed into a cylindrical shape when passing through the gap between the former 32 and the tube 31. The former 32 is also fixed to the support frame 12 via a support member (not shown).

(2-2) First Gas Supply Device The first gas supply device 70 passes through the first flow path P1 and the first auxiliary flow path P1a formed in the main body 311 of the tube 31 described above, and enters the tube 31. This mechanism blows out inert gas. As shown in FIG. 5, the first gas supply device 70 mainly includes a first gas supply source 71 and a path for guiding the inert gas supplied from the first gas supply source 71 to the first flow path P <b> 1 of the tube 31. The first gas supply pipe 72a and the first valve 72 attached to the first gas supply pipe 72a. The first gas supply device 70 supplies a gas of 0.3 MPa to 0.8 MPa, and in the present embodiment, supplies a gas of 0.5 MPa.

  The first valve 72 is automatically opened and closed according to a command from the control unit 10 shown in FIG. When the first valve 72 is temporarily controlled to be “open”, the gas supplied from the first gas supply device 70 is sent to the first flow path P1 via the first gas supply pipe 72a. The time during which the first valve 72 is in the “open” state (that is, the time during which the gas is blown out from the outlet O1) is several seconds when the gas pressure is not so high, and is 0 when the gas pressure is high. .1 to 1.0 seconds. Here, it is 1 to 2 seconds.

(2-3) Second Gas Supply Device The second gas supply device 75 includes the second flow path P, the second auxiliary flow path P2a, and the third auxiliary flow path P2b formed in the main body 311 of the tube 31 described above. This is a mechanism that blows an inert gas into the tubular film Fc or the tube 31. As shown in FIG. 5, the second gas supply device 75 mainly includes a second gas supply source 76 and a path for guiding the inert gas supplied from the second gas supply source 76 to the second flow path P <b> 2 of the tube 31. The second gas supply pipe 77a and the second valve 77 attached to the second gas supply pipe 77a.

  The second valve 77 is “open” when the exhaust valve 78a is open, and supplies the inert gas into the tubular film Fc below the tube 31 serving as a bag. The gas supplied by the second gas supply device 75 flows from the blowout ports O2 and O3 through the internal space of the tube 31 into the cylindrical film Fc below the tube 31. On the other hand, excess gas is discharged from the third flow path P3 of the tube 31 to the exhaust fan 78 through the exhaust pipe 43.

(2-4) Pull-down belt mechanism The pull-down belt mechanism 14 is supported by a support member (not shown) suspended from the top plate 29 of the support frame 12. As shown in FIG. 3, the pull-down belt mechanism 14 is disposed symmetrically with respect to the tube 31. The pull-down belt mechanism 14 extends along the longitudinal direction of the tube 31 and conveys the tubular film Fc wound around the tube 31 while adsorbing it. The pull-down belt mechanism 14 includes a driving roller 14a, a driven roller 14b, a belt 14c having a suction function, and the like.

(2-5) Vertical seal mechanism The vertical seal mechanism 15 is also supported by a support member (not shown) suspended from the top plate 29 of the support frame 12 in the same manner as the pull-down belt mechanism 14 described above. It is arranged so as to extend vertically along the tube 31.

  As shown in FIG. 3, the vertical sealing mechanism 15 is a mechanism that heats the overlapping portion of the tubular film Fc wound around the tube 31 while pressing it against the tube 31 with a constant applied pressure, and vertically seals it. The vertical sealing mechanism 15 includes a heater, a heater belt that is heated by the heater and contacts an overlapping portion of the tubular film, and the like.

(2-6) Horizontal Seal Mechanism The horizontal seal mechanism 16 is disposed below the forming mechanism 13, the pull-down belt mechanism 14, and the vertical seal mechanism 15 and is supported by the support frame 12. That is, the lateral seal mechanism 16 is disposed below the tube 31 of the forming mechanism 13. The horizontal seal mechanism 16 includes a pair of left and right rotating shafts 50 and 50, a pair of left and right seal jaws 51 and 51, and the like.

  As shown in FIGS. 6A and 6B, the seal jaws 51 and 51 are connected to the rotary shafts 50 and 50 via the arm members, and turn around the rotary shafts 50 and 50. The rotary shafts 50 and 50 cause the sealing jaws 51 and 51 to pivot as shown in FIG. 6 and move horizontally so as to approach and separate from each other. The operation to insert is performed.

  The sealing jaws 51 and 51 have a heater inside, and the sealed portion of the sandwiched tubular film Fc is heat-sealed by the heater. Furthermore, a cutter (not shown) is built in one of the pair of sealing jaws 51, 51, and the center of the portion heat-sealed by one sandwiching operation is cut by the cutter. By this cutting, the bags B are separated one by one from the cylindrical film.

(2-7) Control Unit As shown in FIG. 8, the control unit 10 is connected to the film supply unit 6, the pull-down belt mechanism 14, the vertical seal mechanism 15, the horizontal seal mechanism 16, the operation switches 7, the operation display 8, and the like. And controls each drive unit. The control unit 10 controls the opening and closing of the first valve 72, the second valve 77, and the exhaust valve 78a.

<Operation of bag making and packaging machine>
The sheet-like film F sent from the film supply unit 6 to the forming mechanism 13 is wound around the tube 31 from the former 32 and formed into a tubular shape (tube shape), and is conveyed downward by the pull-down belt mechanism 14 as it is. When the film F is wound around the tube 31, the left and right ends are overlapped on the peripheral surface, and the overlapped portion is vertically sealed by the vertical seal mechanism 15. The cylindrical film Fc that is vertically sealed passes through the tube 31 and descends to the horizontal sealing mechanism 16. At this time, the article C falls from the combination weighing machine 2 through the tube 31 into the cylindrical film Fc.

  The lateral seal mechanism 16 laterally seals the tubular film Fc in a state where the article C is present in the tubular film Fc, and forms a lower seal portion serving as a bottom portion of the bag B, and the upper seal of the preceding bag. An upper seal portion to be a portion is formed.

  Next, an operation for adjusting the amount of gas filled in the bag B performed immediately before the lateral sealing operation will be described.

  The article C that has fallen from the combination weighing machine 2 is collected around the lower seal portion S1 in the bag B (see FIG. 7A). The first gas supply device 70 blows out gas from the blowout port O1 toward the opening direction of the tubular film Fc at a timing before the lateral sealing operation starts. Specifically, the first valve 72 is temporarily controlled to be in the “open” state by the control unit 10. Then, the gas supplied from the first gas supply device 70 is blown upward from the blowout port O1 toward the internal space P0 of the main body 311 of the tube 31. That is, the gas is blown out from the blowout port O1 toward the opening of the tubular film Fc positioned above it. When gas is blown out from the blowout port O1, a gas flow is generated upward in the internal space P0 of the tubular film Fc. Due to the upward gas flow, the gas present in the space in the tubular film Fc in the vicinity of the lower seal portion S1 in which the article C is accumulated also moves upward (in the direction toward the opening of the tubular film Fc). Flowing. As a result, the amount of gas in the tubular film Fc around the article C that becomes the bag B is reduced, and the portion of the tubular film Fc that becomes the bag B is deformed into a slightly recessed shape (FIG. 7 ( b)). That is, the width W2 (the dimension in the front-rear direction) of the tubular film Fc that becomes the bag B in FIG. 7B is smaller than the width W1 in FIG.

  Thereafter, the first valve 72 is closed by the control unit 10, and the horizontal sealing mechanism 16 performs horizontal sealing to form the upper sealing portion S2 of the bag B (see FIG. 7C). Here, almost simultaneously with the formation of the upper seal S2 at the upper end of the bag B, the lower seal S1 is formed in the subsequent tubular film Fc. Simultaneously with the lateral sealing operation, the preceding bag B and the subsequent bag B (tubular film Fc) are separated by a cutter (not shown) built in any of the sealing jaws 51.

<Features of the bag making and packaging machine according to this embodiment>
(1)
In the above embodiment, gas flows upward from the blower outlet O1 to the upper side of the tube 31 by blowing the gas upward from the blower outlet O1 formed in the main body 311 of the tube 31. Thereby, the gas below the gas flow can be forcibly moved upward. As a result, the side surface of the cylindrical film Fc around the article C that will form the bag B is dented inward, and the amount of gas filled in the bag B is adjusted slightly.

  Note that the amount of gas can be adjusted by changing the time during which the first valve 72 of the first gas supply device 70 is temporarily opened.

<Other embodiments>
(A)
In the above embodiment, the first flow path P1 and the second flow path P2 are formed in the main body portion 311 of the tube 31. Instead of this structure, pipes corresponding to the first flow path P1 and the second flow path P2 are passed between the double pipes, and the tip opening is configured to face the inside of the tube 31 (internal space P1). Is also possible.

(B)
In the said embodiment, although the tube 31 provided with two blower outlets O1 and three blower outlets O2, O3 is employ | adopted, the number of each blower outlet is not restricted to this number.

(C)
In the above embodiment, there is no mention of gas supply from the low pressure gas supply device 75 through the outlets O2 and O3 and exhaust from the third flow path P3 in the gas amount adjustment operation. It may be temporarily stopped when the gas is blown out. However, in the case where the tubular film Fc is recessed due to the gas blowing from the blowout port O1, the gas supply through the blowout ports O2 and O3 and the exhaust from the third flow path P3 do not have a great influence. Alternatively, the second valve 77 and the exhaust valve 78a may be kept open.

(D)
In the above embodiment, the temperature of the gas filled in the bag B may be lower than the environmental temperature. As a result, after a predetermined time has elapsed (for example, when the packaged product P is boxed), the gas in the bag B slightly expands. As a result, the gap in the box can be reduced and the packaged product P can be prevented from moving in the box.

DESCRIPTION OF SYMBOLS 1 Bag making packaging machine 13 Forming mechanism 14 Pull-down belt mechanism 17 Lateral seal mechanism 31 Tube 70 of a forming mechanism 1st gas supply apparatus (gas amount adjustment apparatus)
75 Second gas supply device (gas supply device)
Fc tubular film (tubular packaging)
P0 Internal space P1 1st flow path P2 2nd flow path P3 3rd flow path O1 Air outlet (air outlet of gas amount adjustment apparatus)
O2, O3 air outlet (air outlet of gas supply device)

JP 2002-179909 A

Claims (3)

A bag making and packaging machine for producing a bag filled with an article to be packed by horizontally sealing a cylindrical packaging material,
A gas supply device for supplying a gas to the cylindrical packaging material;
A lateral seal device that laterally seals the tubular packaging material and forms an upper seal portion and a lower seal portion on the tubular packaging material;
After the lower seal portion is formed, a gas amount adjusting device that blows out gas toward the opening direction of the cylindrical packaging material and adjusts the amount of the gas filled in the bag;
A bag making and packaging machine. The temperature of the gas supplied by the gas supply device is lower than the environmental temperature,
The bag making and packaging machine according to claim 1. Further comprising a molding member for molding the sheet-like packaging material into the cylindrical shape,
The molded member is disposed in an internal space of the cylindrical packaging material,
The gas amount adjusting device has a blowout port that blows out the gas, which is provided in the vicinity of the molded member or the molded member.
The bag making and packaging machine according to claim 1 or 2.

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