JPH09278015A - Horizontal chamber for rotary vacuum packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent faultiness in sealing and vacuumization for a packaging bag while keeping the bag unbroken with slippage in position of a sealing part on the bag mouth prevented in vacuum packaging with a rotary vacuum packaging machine, and to prevent the surface of the packaging bag from becoming creased with swelling or loosening of the packaging bag by vacuumization or unnecessary swelling caused by matters packed in the bag prevented while preventing air from becoming residual. SOLUTION: A horizontal chamber 1 is constructed of a chamber main body 2 and a chamber cap 3 provided at a position above the main body and capable of being opened and shut at an appropriate timing. A hose connecting port 6 for vacuum suction is provided at the chamber cap 3 on a position corresponding approximately to the center of a receiving tray 4 for mounting a filling/packaging bag W thereon in the chamber main body 2. An air stream interference plate 15 is arranged horizontally at a position below the hose connecting port 6 with a space provided in between so that the hose connecting port 6 comes almost to the center and furthermore, an elastic body 20 is attached to the underside of the air stream interference plate for holding down the packaging bag W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type vacuum packaging in which a cycle of supplying and placing a filling packaging bag, degassing, bag mouth sealing and the like is sequentially performed while a plurality of horizontally placed horizontal chambers are rotationally moved. Regarding the horizontal chamber of the machine.

[0002]

2. Description of the Related Art As shown in FIG. 9, a horizontal chamber 1 of a rotary vacuum packaging machine comprises a chamber body 2 and a chamber lid 3, and a package in which a filling material A is stored in a substantially central portion of the chamber body 2. A receiving tray 4 which is a place for placing the bag W is installed horizontally, and a lower sealing device 5a constituting a sealing device 5 is provided on the receiving side (the left side in FIG. 9) of the filling and packaging bag W, and this is vertically driven by a cylinder. A seal pressure welding device 5c is installed, and the chamber lid 3 has a hose connection port 6 for vacuum suction on the upper part thereof and a lower sealing device 5a.
The upper sealing device 5b is installed at a position facing to, and the seal ring 7 is provided at the outer peripheral edge portion, and the chamber lid 3 moves up and down at an appropriate timing to open or close the chamber body 2. Further, a switching valve 8 for switching the inside of the horizontal chamber 1 to the vacuum pump side or the atmosphere side is provided, and this is also switched and operated at an appropriate timing.

A plurality of the horizontal chambers 1 are horizontally installed on the rotor, and while the rotor makes one rotation as the rotor rotates, the steps of supplying and placing a packaging bag, degassing, sealing the bag mouth and the like are performed.

[0004]

In this rotary type vacuum packaging machine, the horizontal chamber 1 is not provided with a gripping means for the packaging bag W therein. In addition, since the vacuum application time is short, high-speed gas movement occurs in the chamber 1 at the start of the degassing process, which causes displacement of the packaging bag containing the lightweight filler in the gas movement direction, The packaging bag is drawn to the suction port, causing problems such as poor sealing, poor vacuum, and broken bags. (Note that when the chamber size is large, the above problem can be avoided by providing a vacuum suction port at a distance from the packaging bag, but this packaging machine is required to be downsized,
Since the chamber is also smaller, the above tendency is remarkable. )

For example, as shown in FIG. 9, when a vacuum suction port 9 is provided on the upper portion of the chamber lid 3, the packaging bag W is drawn to the suction port 9 to form the solid line of the arrow a, and the bag mouth portion W. The sealing position of ₂ shifts, causing a sealing failure as shown in FIG. 10 when sealing is performed. Although it is conceivable to provide a vacuum suction port on the side periphery of the chamber, an air flow is generated in one direction, which makes it easier for the packaging bag W to be displaced, and causes an oblique seal or a seal displacement. Further, for example, when the filling W is lightweight, the packaging bag W is lifted by a suction force to close the suction port 9 as indicated by an imaginary line of an arrow b in FIG. Cause bag breakage.

Further, if the bag mouth W ₂ is sealed in a state where the packaging bag W is inflated upward, wrinkles are generated because the bottom surface of the packaging bag W is pressed by the filling material A when it is returned to the atmosphere in the chamber. Although small, many wrinkles 10 are generated on the upper surface side as shown in FIG. 11, which impairs the commercial value. Such a wrinkle on the upper surface side also occurs when the packaging bag W is swollen upward by the filling material A. Then, in the bag mouth seal in a state where the upper surface of the packaging bag W is freely inflated, air remains in the packaging bag W, which becomes a cause of the deterioration of the internal filling.

The present invention has been made in view of the above-mentioned conventional problems, and its main object is to eliminate the positional deviation of the bag mouth seal portion and to eliminate the sealing failure, vacuum failure, bag breakage, etc. of the packaging bag. . Another object is to suppress bulging or loosening of the packaging bag due to vacuuming and unnecessary bulging due to the filling material, and to reduce or eliminate wrinkles and residual air on the upper surface side of the packaging bag.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a rotary type vacuum packaging in which a cycle of supplying and placing a filling packaging bag, deaeration, bag mouth sealing, etc. is sequentially performed while a horizontally placed horizontal chamber is rotationally moved. Concerning the horizontal chamber of the machine, it consists of a chamber body and a chamber lid above it that opens and closes at appropriate times, and vacuum suction is applied to the chamber lid side at a position corresponding to approximately the center of the place where the filling and packaging bag is placed inside the chamber body. The hose connection port is provided, and the air flow interference plate is attached horizontally so as to be substantially symmetrical with respect to the vertical axis and the horizontal axis passing through the center of the hose connection port and with an appropriate gap from the vacuum suction port. To do. The vertical axis means the vertical direction of the packaging bag, and the horizontal axis means the direction perpendicular to it.

Further, in the horizontal chamber of the rotary type vacuum packaging machine, the air flow interference plate also serves as a bag pressing plate, an elastic body is attached to the lower surface of the air flow interference plate (that is, facing the chamber main body), Forming the interference plate to be long in the longitudinal direction can be given as a preferable specific mode.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described more specifically with reference to FIGS. 1 to 8, the same members as those in FIG. 9 are given the same numbers. The horizontal chamber 1 shown in FIGS. 1 and 2 is basically composed of a chamber main body 2 and a chamber lid 3 which is located above the chamber main body 2 and is opened and closed at an appropriate timing, as shown in FIG. The receiving tray 4 which is a place for placing the packaging bag W containing the filling A is horizontally installed, and the hose connection port 6 for vacuum suction is provided on the chamber lid 3 side at a position corresponding to substantially the center thereof. An airflow interference plate 15 is provided below the hose connection port 6 so that a gap S is opened and the hose connection port 6 is located substantially at the center. The air flow interference plate 15 is connected to the chamber lid 3 via two hanger shafts 16.
A positioning bolt 17 is used for positioning.

In this horizontal chamber 1, the suction port 9 is provided substantially in the center of the chamber lid 3, but it is effective to provide the suction port in the center of the chamber in order to suck the air in the chamber in a well-balanced manner. By suctioning from above, suction of foreign matter (filling material) is reduced, by attaching to the chamber lid it is easy to clean and inspect the vacuum hose. Although it may be possible to provide it on the side of the sealing device, it is difficult to dispose because of interference with the sealing device.

Further, on the receiving side (left side in FIG. 1) of the filling and packaging bag W of the horizontal chamber 1, upper and lower sealing devices 5a and 5b constituting a sealing device 5, and a sealing pressure welding device 5c for vertically driving the sealing devices 5a and 5b. And a seal ring 7 is provided on the outer peripheral edge of the chamber lid 3.

Next, the operation process of this rotary type vacuum packaging machine will be described with reference to the process diagram of FIG. 7. A plurality of chambers 1 are horizontally installed in a rotor and continuously rotated,
During one rotation, the steps (1) to (8) of supplying and placing the packaging bag, degassing, sealing the bag mouth, etc. described below are performed.

(1) Supplying and placing step of filling packaging bag With the chamber lid 3 opened to the top, the packaging bag W containing the filling A is fed from the feeding conveyor 18 onto the receiving tray 4 in the chamber body 2. To be done. Supply conveyor 18
Is set to a supply speed according to the moving speed of the chamber 1. As shown in FIG. 9, the packaging bag W is placed on the supply conveyor 18 with the bag bottom W ₁ side facing forward and the bag mouth W ₂ side facing backward. When the packaging bag W is conveyed in synchronism with the movement and the packaging bag W is supplied onto the receiving tray 4, the bag mouth W ₂ is set to the position of the sealing device 5. As the form of the bag mouth portion W _2, there is bag mouth is subjected to those left open, the temporary sealing.

(2) Lid Tightening Step The chamber lid 3 is lowered by the cam guide provided in the rotor, and is sealed with the chamber main body 2 by the seal ring 7. (3) Deaeration step The inside of the chamber 1 is made to communicate with the vacuum pump side by the switching valve 8, vacuum suction is started, and the inside of the chamber 1 is depressurized (3-1). During this time, the air in the packaging bag W is also sucked from the bag mouth W ₂ . Even if degassing is completed, vacuum suction is continued to maintain the vacuum (3-2).

(4) Sealing process of the bag mouth When the deaeration is almost completed, the seal pressing device 5c is operated, the lower sealing device 5a is pressed against the upper sealing device 5b, and the heaters of the upper and lower sealing devices 5a, 5b are energized and heated. And seal the bag mouth. (5) Cooling of the bag mouth seal portion The upper and lower seal devices 5a and 5b are cooled while being pressed. During this time, the vacuum is maintained.

(6) Return to the atmosphere in the chamber The switching valve 8 is switched to reduce the inside of the chamber 1 to the atmosphere. (7) Chamber lid rises, lower sealing device descends (8) Packaging bag discharge The sealed packaging bag W is taken out from the receiving tray 4 in the chamber body 2 by a discharging device (not shown), and is transferred onto the discharging conveyor 19.

According to the horizontal chamber 1, since the airflow interference plate 15 is interposed between the packaging bag W and the suction port 9, the airflow around the packaging bag W during the vacuum suction is the airflow interference plate 15. To bypass the suction port 9. That is, the packaging bag W
Around the gap S between the airflow interference plate 15 and the chamber lid 3 to the suction port 9 by changing the direction. It will be the other side. Therefore, the upward suction action of the packaging bag W does not occur, the swelling of the upper surface of the packaging bag W is prevented, and the position shift and the like are also prevented. In addition, this air flow interference plate 1
By providing No. 5, problems such as the above-mentioned suction action and positional deviation do not occur even if rapid suction and decompression are performed, so that the processing capacity can be improved.

In FIG. 3, the airflow interference plate 15 is formed to be long in the vertical direction so as to substantially follow the shape of the packaging bag W, and the suction action upward, swelling, and displacement are prevented more reliably and uniformly. be able to.

In FIG. 4, the position of the air flow interference plate 15 is lowered and fixed, and when the chamber lid 3 is closed, the top of the packaging bag W is held at an appropriate height. Has a function of flattening the upper surface side by suppressing the bulging upward, and a function of further reliably preventing the upper surface of the packaging bag W from being swollen, loosened, or displaced.

In FIG. 5, the elastic body 2 is provided on the lower surface of the air flow interference plate 15.
The elastic body 18 presses the upper surface of the packaging bag W when the chamber lid 3 is closed. Needless to say, an elastic body that does not significantly increase in volume under vacuum is impossible, and for example, sea surface rubber (sponge), wire aggregates, resin foam filters, nylon scrubber-like materials, etc. can be appropriately used. . By providing this elastic body 20, even a packaging bag W containing a somewhat uneven filling can be surely brought into close contact with the bag and the swelling or loosening of the upper surface of the packaging bag can be further prevented.

According to the horizontal chamber 1 of the present invention described above, since the air flow interference plate 15 is provided in all of them, the upward suction action of the packaging bag W does not occur and the upward expansion of the packaging bag W is prevented. Further, the positional displacement and the like are prevented, and the problems such as the suction action and the positional displacement do not occur even if the rapid suction and pressure reduction are performed, so that the processing capacity can be improved.

Further, since the upper surface of the packaging bag W can be prevented from being swollen or loosened, wrinkles do not occur on the surface of the packaging bag after the vacuum treatment. This is illustrated in FIG. 6, and the bottom side of the packaging bag W is pressed by the filling material and the top side of the packaging bag W is pressed by the airflow interference plate 15 during vacuum suction, and the packaging bag W is held on either side. Has no bulge or slack, and bulges only on the side surface (FIG. 6A). Therefore, when the bag is sealed and returned to the atmosphere, no wrinkles are generated on the top and bottom sides,
Wrinkles occur only on the side surface (FIG. 6 (b)). That is,
According to the present invention, it is possible to collect wrinkles only on the side surface side and prevent wrinkles from being generated on the top and bottom surfaces. Moreover, residual air in the packaging bag can be reduced by preventing unnecessary bulging and loosening. The airflow interference plate 15 of FIG.
Since it has the elastic body 20, even if the filling in the packaging bag W has irregularities, it adheres to the upper surface and is particularly effective in preventing wrinkles, but even the type without the elastic body 20 shown in FIG. 1 or FIG. As described above, it is possible to prevent unnecessary bulging and loosening of the bag, and it goes without saying that the bag also has a function of preventing wrinkles on the upper surface.

[0024]

EFFECTS OF THE INVENTION According to the present invention, it is possible to eliminate the position shift of the bag mouth seal portion and prevent the sealing failure such as the diagonal seal and the seal shift, and also the vacuum failure due to the blocking of the suction port, the bag breakage, etc. Can be prevented, and rapid suction and decompression can be performed, so that the processing capacity is improved. Furthermore, since bulging or loosening of the upper surface of the packaging bag is suppressed, wrinkles on the upper surface of the bag are eliminated, and residual air in the packaging bag is further reduced. Further, by attaching an elastic body to the lower surface of the air flow interference plate, it is possible to tightly hold the bag even in a packaging bag containing a filling material having some irregularities.

[Brief description of drawings]

FIG. 1 is a sectional view of a horizontal chamber according to the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a plan view of another example of the horizontal chamber according to the present invention.

FIG. 4 is a cross-sectional view of still another example of the horizontal chamber according to the present invention.

FIG. 5 is a cross-sectional view of still another example of the horizontal chamber according to the present invention.

FIG. 6 is a cross-sectional view illustrating the operation thereof.

FIG. 7 is an explanatory diagram of an operation process of the rotary vacuum packaging machine according to the present invention.

FIG. 8 is a diagram illustrating a method of supplying a packaging bag to a horizontal chamber.

FIG. 9 is a cross-sectional view of a conventional horizontal chamber.

FIG. 10 is an explanatory diagram of a packaging bag having a defective seal.

FIG. 11 is an explanatory diagram of a packaging bag having wrinkles on its surface.

[Explanation of symbols]

 1 Horizontal chamber 2 Chamber body 3 Chamber lid 4 Receiving tray 5 Sealing device 6 Vacuum hose connection port 9 Suction port 15 Air flow interference plate 20 Elastic body W Packaging bag

Claims (4)

[Claims] 1. A horizontal chamber of a rotary type vacuum packaging machine for sequentially performing a cycle of feeding and placing a filling and packaging bag, deaeration, bag mouth sealing, etc. while the horizontally placed horizontal chamber is rotationally moved. It consists of a chamber main body and a chamber lid above it that opens and closes at appropriate times, and a hose connection port for vacuum suction is provided on the chamber lid side at a position corresponding to approximately the center of the place where the filling and packaging bag is placed inside the chamber main body. The rotary vacuum packaging machine is characterized in that an air flow interference plate is attached horizontally so as to be substantially symmetrical with respect to the vertical and horizontal axes passing through the center of the hose connection port, and with a proper gap from the vacuum suction port. Horizontal chamber. 2. The horizontal chamber of a rotary type vacuum packaging machine according to claim 1, wherein the air flow interference plate also serves as a packaging bag pressing plate. 3. The horizontal chamber of the rotary vacuum packaging machine according to claim 2, wherein an elastic body is attached to the lower surface of the air flow interference plate. 4. The horizontal chamber of a rotary vacuum packaging machine according to claim 1, wherein the air flow interference plate is formed to have a lengthwise dimension in the longitudinal axis direction.