JP2022029692A - Vacuum packaging machine and vacuum packaging method - Google Patents

Abstract

To provide a vacuum packaging machine of a type for welding and sealing a bag mouth by a heating wire after air in a packaging bag is sucked to be removed by a nozzle inserted into the bag mouth, which is configured such that a packaging failure is difficult to occur.SOLUTION: A vacuum packaging machine is configured to press a heating wire to a bag mouth into which a nozzle has been inserted and weld and seal a part other than the nozzle inserted part of the bag mouth before air in the packaging bag is sucked by the nozzle. This configuration enables improvement of the rigidity of the bag mouth before the air is removed from the packaging bag. Thus, wrinkles difficult to occur in the bag mouth and a packaging failure is difficult to occur during air removal from the packaging bag. This configuration enables air to be removed even from a special packaging bag having irregular parts formed on one side of the inner surface of the bag mouth, and thus convenience can be improved.SELECTED DRAWING: Figure 7

Description

The present invention relates to a vacuum packaging machine that seals a plastic packaging bag containing an object to be packaged by welding and sealing the bag mouth in a degassed state.

A tabletop vacuum packaging machine that seals a plastic packaging bag containing an object to be packaged by welding the bag mouth in a degassed state is widely known. Such a vacuum packaging machine includes a type in which a nozzle is inserted into the bag mouth to degas the packaging bag (for example, Patent Document 1) and a chamber formed inside the packing by sandwiching the bag mouth with a pair of packings. There is a type (for example, Patent Document 2) in which the packaging bag is degassed by making the inside of the bag negative pressure. Here, in the vacuum packaging machine of Patent Document 1, a general packaging bag made of a plastic film having a smooth surface is used, but in the vacuum packaging machine of Patent Document 2, air is blown from the bag mouth even in a state of being sandwiched by packing. A special packaging bag having irregularities formed on one side of the inner side surface is used so that it can be discharged (for example, Patent Document 3). The vacuum packaging machine of Patent Document 1 does not use the special packaging bag described in Patent Document 3. The vacuum packaging machine of Patent Document 1 sandwiches the bag mouth with packing so that outside air does not flow into the bag from other than the nozzle insertion portion at the time of degassing, but the special packaging bag of Patent Document 3 sandwiches the bag mouth. Even so, the outside air flows into the bag through the uneven gaps formed on the inner side surface.

Jitsuto 3166827 Gazette Japanese Patent Application Laid-Open No. 2003-040214 Japanese Unexamined Patent Publication No. 01-294027

In the vacuum packaging machine described in Patent Document 1, when the packaging bag is degassed, the packaging bag adheres to the packaged object, so that wrinkles may be formed around the packaged object. When the packaging bag is sealed, the bag mouth may be welded in a wrinkled state. Since the bag mouth welded in a wrinkled state may be insufficiently sealed, it is often judged that the packaging is defective, and the vacuum packaging needs to be redone. Therefore, the vacuum packaging machine described in Patent Document 1 is required to have a structure in which wrinkles are less likely to occur at the bag mouth during degassing.

The present invention has been made in view of the present situation, and an object of the present invention is to provide a vacuum packaging machine of a type in which air in a packaging bag is sucked and degassed by a nozzle, and a configuration in which packaging defects are unlikely to occur is provided. ..

The present invention is a vacuum packaging machine that seals a plastic packaging bag containing an object to be packaged by welding and sealing the bag mouth in a degassed state. A pressing portion that is arranged so as to be relatively movable in the direction of contact and separation with respect to the heating wire, a nozzle that is held so that it can be converted into an advancing position that advances the tip forward and a retracting position that retracts the tip backward. Controls a nozzle transfer device capable of transferring the nozzle to the advance position and the retracted position, a suction device capable of sucking air from the tip of the nozzle, an energized state of the heating wire, the nozzle transfer device, and the suction device. In the control device, the nozzle at the advance position is inserted into the bag mouth of the packaging bag, and the bag mouth is pressed against the heating wire together with the nozzle by the pressing portion. Then, after the first process of temporarily controlling the heating wire to be energized and the first process, the second process of controlling the suction device so as to suck the air inside the packaging bag from the tip of the nozzle. After the process and the second process, the third process of controlling the nozzle transfer device to convert the nozzle to the retracted position, and after the third process, the heating wire is temporarily controlled to be energized. It is a vacuum wrapping machine characterized in that it is possible to execute a series of vacuum wrapping processes in which a fourth process for controlling the energization switch is sequentially executed.

In the vacuum packaging process of the present invention, at the stage of the first process, the bag mouth of the packaging bag is sealed by welding other than the insertion portion of the nozzle by the heated heating wire. Then, in the second treatment stage, the packaging bag is degassed, but the portion where the bag mouth is welded in the first treatment is more rigid than before welding because the plastic films on the front and back are joined. Since the height is high, in the second treatment, wrinkles are less likely to occur at the bag mouth as compared with the case where the packaging bag is degassed without going through the first treatment. Therefore, if vacuum packaging is performed by the vacuum packaging process according to the present invention, packaging defects are less likely to occur as compared with the conventional configuration.

Further, the vacuum packaging machine of the present invention can be vacuum-packed not only by using a packaging bag having a smooth inner surface but also by using a special packaging bag having an uneven shape formed on one side of the inner surface. In the vacuum packaging process of the present invention, before the packaging bag is degassed in the second process, the portion other than the nozzle insertion portion of the bag mouth is sealed, so that even a packaging bag having an uneven shape on the inner surface is formed. This is because, in the second process, outside air does not flow in from other than the nozzle insertion portion. A packaging bag having an uneven shape on the inner surface is relatively expensive, but has the advantage that wrinkles are less likely to occur during degassing and packaging defects are less likely to occur compared to a packaging bag having a smooth inner surface. Therefore, in the vacuum packaging machine of the present invention, if the two types of packaging bags are selectively used, the convenience can be improved as compared with the conventional vacuum packaging machine.

Further, the vacuum packaging machine of the present invention has an advantage that it can be easily realized only by changing the control processing content of the control device of the existing vacuum packaging machine.

In the present invention, it is proposed that the nozzle is made of metal. In such a configuration, since the heat of the heating wire can be released to the nozzle during the first treatment, the plastic film of the packaging bag is melted by the heat of the heating wire at the portion where the nozzle is pressed against the heating wire, and a hole is formed. It can be prevented from opening.

Another aspect of the present invention is a vacuum packaging method in which a plastic packaging bag containing an object to be packaged is sealed by welding the bag mouth in a degassed state, and the bag mouth of the packaging bag is sealed. The first step of sealing the bag mouth other than the insertion portion of the nozzle by heating over the entire width with the nozzle inserted, and the inside of the packaging bag from the tip of the nozzle. A second step of sucking air to degas the packaging bag, a third step of moving the nozzle in a direction of retracting from the bag mouth, and heating the bag mouth with the heating wire. It is a vacuum packaging method characterized by sequentially executing a fourth step of sealing a portion of the bag mouth into which the nozzle was inserted in the first step.

According to such a vacuum packaging method, the bag mouth of the plastic packaging bag is welded except for the insertion portion of the nozzle in the first step to increase the rigidity, so that air is sucked from the tip of the nozzle in the second step. Sometimes it becomes difficult for wrinkles to form on the bag mouth. Therefore, according to the vacuum packaging method of the present invention, packaging defects are less likely to occur as compared with the conventional method of degassing the packaging bag without welding the bag mouth at all.

As described above, according to the present invention, in a vacuum packaging machine of a type in which air in a packaging bag is sucked and degassed by a nozzle, packaging defects are less likely to occur. In particular, when used by an unfamiliar worker, the packaging bag is liable to wrinkle, and packaging defects are relatively liable to occur. Therefore, the present invention is suitable for an unfamiliar worker to work. In general, it is desirable that the degree of vacuum when degassing the packaging bag is high, but the higher the degree of vacuum during degassing, the stronger the force to wither the packaging bag, and wrinkles appear on the bag mouth. There is a trade-off relationship that makes it easier to approach. On the other hand, in the present invention, even when degassing at the same degree of vacuum, wrinkles are less likely to form on the bag mouth during degassing as compared with the conventional case, so that it is suitable for degassing at a higher degree of vacuum than before. .. Further, since the vacuum packaging machine of the present invention can use both a packaging bag having a smooth inner surface and a packaging bag having an uneven shape formed on the inner surface, two types of packaging bags are selectively used. This can also improve convenience.

It is a perspective view of the vacuum packaging machine 1. It is a right side view of the vacuum packaging machine 1. It is sectional drawing of the vacuum packing machine 1 which omits an internal mechanism, (a) shows the cross section of line AA in FIG. 2, and (b) shows the cross section of line BB in FIG. It is a right side view of the vacuum packaging machine 1, (a) shows the state which changed the nozzle 15 to the retracting position s, and (b) shows the state which changed the pressing part 11 into the closing position q. It is a block diagram which shows the control circuit of a vacuum packaging machine 1. It is (a) right side view and (b) horizontal sectional view in the state where the vacuum packaging machine 1 is set with the packaging bag F. (A) is a flowchart showing the control process contents of the vacuum packaging process of the one-time sealing mode. (B) is a flowchart showing the control process contents of the vacuum packaging process of the double sealing mode. It is a right side view of the vacuum packaging machine 1 during the vacuum packaging process, (a) shows the closing process, and (b) shows the degassing process. (A) is an explanatory diagram showing a sealing process, and (b) is an explanatory diagram showing a partial sealing process.

Embodiments of the present invention will be described with reference to the following examples. In the following examples, the vacuum packaging process according to the present invention corresponds to the vacuum packaging process in the double encapsulation mode, the first process according to the present invention is the partial encapsulation process, and the second process is the partial encapsulation process. The degassing process, the third process correspond to the nozzle evacuation process, and the fourth process corresponds to the sealing process. Further, the vacuum packaging method according to the present invention corresponds to the vacuum packaging method executed by the vacuum packaging process in the double sealing mode, and the first step is executed by the partial sealing process in the double sealing mode, and the first step is performed. The second step is executed by the degassing process, the third step is executed by the nozzle retracting process, and the fourth step is executed by the sealing process. Further, the nozzle transfer device according to the present invention is configured by the nozzle drive motor 25. Further, the suction device according to the present invention is configured by a vacuum pump.

The vacuum packaging machine 1 of the present embodiment seals a plastic packaging bag containing an object to be packaged by welding the bag mouth in a degassed state. As shown in FIGS. 1 and 2, the housing 2 of the vacuum packaging machine 1 includes a wide pedestal portion 3 extending to the front of the lower portion and a wide eaves portion 4 extending to the front of the upper portion. It is U-shaped.

As shown in FIGS. 2 and 3A, the upper portion of the pedestal portion 3 is substantially flat, and the heating wire 6 is arranged on the pedestal portion 3 in the width direction. As will be described later, the vacuum packaging machine 1 seals the packaging bag by an impulse seal method by temporarily passing a large current through the heating wire 6 to heat the vacuum packaging machine 1. The heating wire 6 is covered with a protective tape 7 made of Teflon (registered trademark) in order to prevent the packaging bag from being welded to the heating wire 6. Further, on the upper portion of the pedestal portion 3, a rib-shaped lower packing 8 for sandwiching and sealing the bag mouth is arranged in parallel on the front side of the heating wire 6 at an interval of about 1 cm. Further, two operation switches 10a and 10b are arranged in front of the right side of the pedestal portion 3. One operation switch is a start operation switch 10a mainly used for the start operation of vacuum packaging, and the other operation switch is a selection operation switch 10b used for selection of the vacuum packaging mode described later.

As shown in FIGS. The pressing portion 11 is movably held in a direction in which the pressing portion 11 is brought into contact with and separated from the pedestal portion 3 by a telescopic structure that can be expanded and contracted up and down, and is separated from the upper surface of the pedestal portion 3 as shown in FIG. 4 (a). As shown in FIG. 4B, it is possible to convert the open position p into a closed position q in which the bottom portion is pressed onto the pedestal portion 3. Two upper packings 12a and 12b are arranged in parallel on the bottom of the pressing portion 11 along the width direction, and at the closing position q of the pressing portion 11, the upper packing 12a on the back side connects the heating wire 6. The upper packing 12b on the front side comes into contact with the lower packing 8 so as to come into contact with the protective tape 7 to cover the cover.

As shown in FIG. 1, an opening 14 is formed in the center of the wall surface of the front surface of the housing 2 that rises from the back of the pedestal portion 3, and a nozzle for sucking air in the packaging bag. 15 is arranged so as to project forward from the opening 14. The nozzle 15 is a flat metal cylinder made of stainless steel. The base end side of the nozzle 15 is connected to the vacuum pump via a tube inside the housing 2, and air is sucked from the tip end side of the nozzle 15 when the vacuum pump is operated. The nozzle 15 is held inside the housing 2 so as to be movable in the front-rear direction, and as shown in FIGS. The advance position r where the tip is advanced to the front of the heating wire 6 and the lower packing 8, and as shown in FIG. 4A, the tip is retracted to the rear of the heating wire 6 and is housed inside the housing 2. It can be converted to the retracted position s.

Further, as shown in FIG. 1, two operation switches 10c and 10d and a display 17 are arranged at the upper left back of the housing 2. The two operation switches 10c and 10d are for setting the strength for sealing the packaging bag (energization time of the heating wire 6), and the current set strength is displayed numerically on the display 17. Further, on both sides of the upper part of the housing 2, indicator lamps 18a and 18b indicating the vacuum packaging mode and the progress of vacuum packaging are arranged according to the lighting pattern. Further, a power switch 19 is arranged at the lower right side of the housing 2.

FIG. 5 shows a control circuit of the vacuum packaging machine 1. The control device 20 of the vacuum packaging machine 1 is composed of a microcomputer and is arranged inside the housing 2. Signals are input to the control device 20 from the operation switches 10a to 10d, the nozzle position detection switch 27, the open / close position detection switch 28, and the barometric pressure sensor 29. Then, the control device 20 controls the display 17, the display lamps 18a and 18b, the open / close motor 22, the heating wire energization switch 23, the vacuum pump 24, and the nozzle drive motor 25 based on these input signals. The control device according to the present invention may be configured by a sequence circuit instead of the microcomputer.

The opening / closing motor 22 is for driving the pressing portion 11 up and down, and the control device 20 controls the opening / closing motor 22 to convert the pressing portion 11 into an open position p and a closed position q at a required timing. .. The heating wire energization switch 23 is a switch that switches the heating wire 6 between an energized state and a non-energized state, and the control device 20 controls the energizing state of the heating wire 6 via the heating wire energizing switch 23. 6 is heated at a required timing. The vacuum pump 24 is for sucking air from the tip of the nozzle 15, and is connected to the base end side of the nozzle 15 via a tube inside the housing 2. By controlling the vacuum pump 24, the control device 20 sucks air from the tip of the nozzle 15 at a required timing. The nozzle drive motor 25 is for transferring the nozzle 15 to the advance position r and the retracted position s, and the control device 20 controls the nozzle drive motor 25 to move the nozzle 15 to the advance position r at a required timing. Convert to the save position s.

The nozzle position detection switch 27 is a switch that is disposed inside the housing 2 and detects the advance position r and the retracted position s of the nozzle 15, respectively. The open / close position detection switch 28 is a switch that detects the open position p and the closed position q of the pressing portion 11, respectively. Further, a barometric pressure sensor 29 is connected to the control device 20. The atmospheric pressure sensor 29 is for detecting the degree of degassing inside the packaging bag, and when the atmospheric pressure in the tube connecting the nozzle 15 and the vacuum pump 24 becomes equal to or lower than a predetermined pressure, a detection signal is sent to the control device 20. Is output.

The vacuum packaging method using the vacuum packaging machine 1 of this embodiment will be described below.
As described above, the vacuum packaging machine 1 of the present embodiment seals the plastic packaging bag F containing the object to be packaged H by welding the bag mouth G in a degassed state. As the packaging bag, a general packaging bag F made of a smooth plastic film is preferably used. The shape of the packaging bag F may be any shape as long as the bag mouth G is formed on one side, and a three-sided bag, a two-sided bag, a bottom seal bag, a gassho bag, a gusset bag, or the like can be used. As shown in FIGS. 1 and 2, the vacuum packaging machine 1 holds the pressing portion 11 at the open position p and the nozzle 15 at the advance position r, which is a standby state before the start of vacuum packaging. In such a standby state, when a general packaging bag F containing the object to be packaged H is set in the vacuum packaging machine 1 and the start operation switch 10a is pressed, the control device 20 executes a series of vacuum packaging processes. , The packaging bag F is sealed in a degassed state.

Specifically, as shown in FIGS. 6 (a) and 6 (b), in the packaging bag F, the nozzle 15 is inserted into the bag opening G in a state where the packaged object H is housed, and the bag opening G is inserted. Set it so that it overlaps the heating wire 6 and the lower packing 8 over the entire width.

There are two types of vacuum packaging processing executed by the control device 20: a one-time sealing mode and a two-time sealing mode. In the vacuum packaging process in the one-time sealing mode, the packaging bag F is sealed only after the packaging bag F is degassed. Such a one-time sealing mode is a vacuum packaging process that is also performed in a known vacuum packaging machine. On the other hand, in the vacuum packaging process in the double sealing mode, the bag opening G is partially sealed before the packaging bag F is degassed. The one-time sealing mode and the two-time sealing mode can be selected by operating the selection operation switch 10b in the standby state.

FIG. 7A is a flowchart showing the control processing contents of the vacuum packaging process in the one-time sealing mode. In the one-time sealing mode, the control device 20 sequentially executes the closing process, the degassing process, the nozzle evacuation process, the sealing process, and the opening process described below.

In the closing process, the control device 20 drives the opening / closing motor 22 to convert the pressing portion 11 into the closing position q as shown in FIG. 8A. As a result, the bag opening G arranged on the heating wire 6 and the lower packing 8 is pressed against the heating wire 6 from above the protective tape 7 over the entire width by the upper packing 12a on the back side. G is pressed against the lower packing 8 over the entire width by the upper packing 12b on the front side. At this time, since the nozzle 15 inserted into the bag opening G is in the advance position r and the tip of the nozzle 15 protrudes in front of the heating wire 6 and the lower packing 8, the nozzle 15 is pressed by the upper packings 12a and 12b. The bag mouth G is pressed against the heating wire 6 and the lower packing 8.

In the degassing process, the control device 20 operates the vacuum pump 24 to suck the air inside the packaging bag F from the tip of the nozzle 15. At this time, since the bag opening G is sandwiched between the upper packing 12b and the lower packing 8 of the packaging bag F and the outside air does not flow into the inside, the inside of the packaging bag F is degassed by the degassing treatment. As shown in FIG. 8B, the packaging bag F comes into close contact with the surface of the object to be packaged H. When the control device 20 receives the detection signal from the barometric pressure sensor 29 or 60 seconds have elapsed from the start of operation of the vacuum pump 24, the vacuum pump 24 is stopped and the degassing process is completed.

In the nozzle retracting process, the control device 20 operates the nozzle drive motor 25 to move the nozzle 15 rearward to convert the advance position r to the retracted position s. As a result, the nozzle 15 is pulled out from between the heating wire 6, the lower packing 8, and the upper packings 12a and 12b, and the tip thereof is retracted inside the housing 2.

In the sealing process, the control device 20 turns on the heating wire energization switch 23 to temporarily supply a large current to the heating wire 6, and the heated wire 6 heats the bag mouth G over the entire width. As shown in FIG. 9A, at the start of the sealing process, the nozzle 15 is retracted to the retracted position s that does not overlap with the heating wire 6, and therefore, in the sealing process, the heating wire of the bag mouth G is retracted. The portion X pressed against 6 is welded, and the bag opening G is sealed over the entire width. Then, when the time corresponding to the preset sealing strength elapses, the control device 20 turns off the heating wire energization switch 23 to put the heating wire 6 into a non-energized state. Then, after a certain cooling time, the process shifts to the opening process.

In the opening process, the control device 20 operates the opening / closing motor 22 to convert the pressing portion 11 from the closing position q to the opening position p. As a result, the bag opening G is released from being pinched by the lower packing 8 and the upper packing 12b, and the package bag F sealed in the degassed state can be removed from the vacuum packaging machine 1. When the selection operation switch 10b is operated after the opening process, the vacuum packaging machine 1 moves the nozzle 15 to the advance position r and returns to the standby state.

As described above, in the one-time sealing mode, the bag mouth G is welded over the entire width by energizing the heating wire 6 after degassing the packaging bag F, and the packaging bag F is sealed in the degassed state. .. On the other hand, in the double sealing mode, the bag opening G in which the nozzle 15 is inserted is heated over the entire width by the heating wire 6 before the packaging bag F is degassed. , The part other than the insertion portion of the nozzle 15 is sealed.

FIG. 7B is a flowchart showing the control processing contents of the vacuum packaging process in the double sealing mode. As is clear from the comparison with the control processing content of the single sealing mode (see FIG. 7A), the control processing content of the double sealing mode is a portion after the closing process and before the degassing process. It differs from the one-time sealing mode in that the sealing process is performed. The other control processing contents of the double sealing mode are the same as the control processing contents of the single sealing mode.

In the partial sealing process, the control device 20 turns on the heating wire energization switch 23 to temporarily supply a large current to the heating wire 6, and the heat-generating heating wire 6 heats the bag mouth G over the entire width. The amount of current and the energization time of the heating wire 6 are the same as those in the sealing process, but may be different from those in the sealing process. As shown in FIG. 9B, such a partial sealing process is performed in a state where the nozzle 15 is inserted into the bag opening G and sandwiched between the heating wire 6 and the upper packing 12a, so that the nozzle 15 is inserted. For the portion Z, the bag mouth G is not welded even if it is heated by the heating wire 6. Therefore, in the partial sealing process, the portion Y of the bag opening G excluding the insertion portion Z of the nozzle 15 is welded and sealed by the heating wire 6. In the partial sealing process, in the insertion portion Z of the nozzle 15 of the bag opening G, only one side of the plastic film on the front and back of the bag opening G is heated by the heating wire 6, but the plastic film is excessive at the portion Z. There is no risk of opening holes due to heating. This is because in the portion Z, the heat of the heated bag mouth G can be released to the nozzle 15 made of metal and having high thermal conductivity.

In the double-sealing mode, the control device 20 executes the degassing process, the nozzle evacuation process, the sealing process, and the opening process in order, in the same manner as in the single-sealing mode, after the partial sealing process. Degas and seal the packaging bag F. Here, in the degassing treatment in the double sealing mode, the portion other than the insertion portion Z of the nozzle 15 of the bag opening G is welded and sealed before the degassing treatment, so that during the degassing treatment, the bag mouth G is sealed. , There is an advantage that wrinkles are hard to be formed on the bag mouth G. That is, in the degassing treatment, since the degassed packaging bag F is in close contact with the packaged object H, wrinkles are likely to form around the packaged object H, but the welded portion of the bag mouth G (FIG. 9 (b)). The Y part) in) has higher rigidity than before welding because the plastic films on the front and back are integrally bonded, so compared to the case where the degassing process is performed without welding the bag mouth G at all. Therefore, it is difficult for wrinkles to form on the bag mouth G during the degassing process.

Further, in the sealing process in the double welding mode, the bag opening G is heated over the entire width by the heating wire 6, but the portion of the bag opening G where the nozzle 15 is not inserted (FIG. 9). Since the Y portion in (b) has already been welded in the partial sealing process, in the sealing process, the portion in which the nozzle 15 is inserted into the bag opening G in the partial sealing process (FIG. 9 (b)). ) Is additionally welded and sealed, and the packaging bag F is sealed over the entire width of the bag opening G.

As described above, in the double sealing mode, by executing the partial sealing treatment before the degassing treatment, wrinkles are formed in the bag mouth G during the degassing treatment as compared with the single sealing mode. It has the advantage of being difficult. If the bag mouth is welded in a wrinkled state, the sealing may be insufficient, and in many cases it is judged that the packaging is defective. For example, it is possible to reduce packaging defects as compared with the one-time sealing mode. In particular, when used by an unfamiliar worker, packaging defects are likely to occur, so the double-sealing mode is suitable for use by an unfamiliar worker. In general, it is desirable that the degree of vacuum when degassing the packaging bag F is high, but the higher the degree of vacuum during degassing, the stronger the force to wither the packaging bag F, and the bag mouth G. There is a trade-off relationship in which wrinkles are more likely to occur. On the other hand, the double-sealing mode has an advantage that the degree of vacuum at the time of degassing is easier to increase than the single-sealing mode because wrinkles are less likely to be formed on the bag mouth G as compared with the single-sealing mode. be.

The vacuum packaging method described above describes a case where a general packaging bag F made of a film having a smooth surface is used, but the vacuum packaging machine 1 of this embodiment is described in Patent Document 3 above. A special packaging bag (hereinafter referred to as "special packaging bag") having an uneven shape formed on one side of the inner side surface, such as a packaging bag, can also be used. In the special packaging bag Fa, a rectangular concavo-convex film F1 having irregularities formed on one side and a rectangular smooth film F2 having smooth surfaces on both sides are superposed so that the irregularities of the concavo-convex film F1 are on the inside. The sides are welded to each other, and the remaining side is the bag mouth G.

Such a special packaging bag Fa is difficult to degas in the one-time sealing mode, but can be degassed in the two-time sealing mode. When performing the vacuum packaging process in the double sealing mode using the special packaging bag Fa, first, as shown in FIGS. 6 (a) and 6 (b), the nozzle 15 is inserted into the bag mouth G of the packaging bag Fa. Is inserted, and the bag mouth G is set so as to overlap the heating wire 6 and the lower packing 8 over the entire width. Here, when the special packaging bag Fa is used, the uneven film F1 is arranged so as to face the heating wire 6 side (lower side). Then, when the start operation switch 10a is pressed with the special packaging bag Fa set, the control device 20 performs the vacuum packaging process in the double sealing mode as in the case of using the general packaging bag F. Execute.

In the vacuum packaging process in the double encapsulation mode using the special packaging bag Fa, in the partial encapsulation process before the degassing process, as shown in FIG. 9B, the insertion portion of the nozzle 15 of the bag opening G The portion Y excluding Z is welded and sealed by the heated heating wire 6. Regarding the insertion portion Z of the nozzle 15, since the nozzle 15 is inserted between the concave-convex film F1 and the smooth film F2, the bag opening G is not welded, but the concave-convex film F1 arranged on the heating wire 6 side is a nozzle. By being heated by the heating wire 6 in a state of being in pressure contact with 15, the unevenness is crushed and the nozzle 15 comes into close contact with the surface.

In the vacuum packaging process in the double-sealing mode using the special packaging bag Fa, the special packaging bag Fa is normally used in the subsequent degassing process by performing the partial sealing process before the degassing process. It can be degassed like the packaging bag F. That is, if the air inside the special packaging bag Fa is sucked from the nozzle 15 by executing the degassing process without executing the partial sealing process, the bag opening G is used by the lower packing 8 and the upper packing 12b. The uneven film F1 and the smooth film F2 are not in close contact with each other, and the outside air can flow into the inside of the special packaging bag Fa through the gap between the films F1 and F2, so that the packaging bag Fa cannot be degassed. .. On the other hand, when the partial sealing process is executed before the degassing process, the uneven film F1 and the smooth film F2 are welded at the portion Y excluding the insertion portion Z of the nozzle 15, and the insertion portion of the nozzle 15 is inserted. Since the uneven film F1 is in close contact with the surface of the nozzle 15 at Z, outside air does not flow into the inside of the packaging bag Fa in the subsequent degassing treatment, and the packaging bag Fa can be appropriately degassed.

As described above, since the vacuum packaging machine 1 of the present embodiment can use the special packaging bag Fa having irregularities formed on one side of the inner side surface, vacuum packaging can be performed even when there is only the special packaging bag Fa at hand. .. Further, the special packaging bag Fa is more expensive than the general packaging bag F, but on the other hand, wrinkles are less likely to occur during degassing and packaging defects are less likely to occur. Therefore, the general packaging bag F and the special packaging are less likely to occur. Convenience can be improved by selectively using the bag Fa according to the situation.

In the vacuum packaging machine 1 of the present embodiment, the case of performing vacuum packaging in the double-sealing mode can reduce packaging defects as compared with the single-sealing mode, but the single-sealing mode is better. Vacuum packaging can be performed in a shorter time than in the double-sealing mode, and since the incidence of packaging defects is extremely low for skilled workers, the single-sealing mode is more vacuum-packed. In some cases, packaging can be done efficiently. That is, the vacuum packaging machine 1 of the present embodiment can appropriately perform vacuum packaging as compared with the existing vacuum packaging machine by selecting the one-time sealing mode and the two-time sealing mode according to the situation. can.

Further, since the vacuum packaging machine 1 of the present embodiment has an existing hardware configuration, there is an advantage that it can be easily realized only by improving the control processing content of the control device of the existing vacuum packaging machine 1. ..

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments of the above embodiments, and various modifications can be made without departing from the gist of the present invention. For example, in the above embodiment, the control device 20 controls switching between the open position p and the closed position q of the pressing portion 11, but in the vacuum packaging machine 1 of the present invention, the pressing portion 11 is manually opened at the open position p. And may be converted to the closing position q. Further, in the above embodiment, the pressing portion 11 is moved with respect to the heating wire 6, but the vacuum packaging machine according to the present invention may move the heating wire 6 with respect to the pressing portion 11. .. Further, the vacuum packaging machine according to the present invention may be configured to heat the bag mouth from both the upper and lower sides by disposing a heating wire on the pressing portion side as well.

Further, the vacuum packaging process of the above embodiment is configured to end the degassing process based on the detection signal of the pressure sensor 29 and the operating time of the vacuum pump 24. The operator may visually check the degassing condition of the packaging bag F and instruct the control device 20 to end the degassing process by operating the operation switch.

Further, in the above embodiment, when the nozzle 15 inserted into the bag mouth G is moved from the advance position r to the retracted position s, the nozzle 15 is configured to completely fall off from the bag mouth G. The retracted position may be a position where the nozzle 15 does not overlap with the heating wire 6, and may not be a position where the nozzle 15 completely falls off the bag opening G.

1 Vacuum packaging machine 2 Housing 3 Pedestal part 4 Eaves 6 Heating wire 7 Protective tape 8 Lower packing 10a to 10b Operation switch 11 Pressing part 12a, 12b Upper packing 15 Nozzle 19 Power switch 20 Control device 22 Opening / closing motor 23 Heating wire energization Switch 24 Vacuum pump (suction device)
25 Nozzle drive motor (nozzle transfer device)
27 Nozzle position detection switch 28 Open / close position detection switch 29 Barometric pressure sensor F Packaging bag G Bag mouth H Packaged object r Advance position s Retract position

Claims (3)

A vacuum packaging machine that seals a plastic packaging bag containing an object to be packaged by welding the bag mouth in a degassed state.
The heating wire arranged in the width direction and
A pressing portion arranged so as to be relatively movable in the direction of contact and separation with respect to the heating wire, and a pressing portion.
A nozzle that is held so that it can be converted into an advance position where the tip advances forward and a retract position where the tip retracts backward.
A nozzle transfer device capable of transferring the nozzle to the advance position and the retracted position,
A suction device that can suck air from the tip of the nozzle,
A control device for controlling the energized state of the heating wire, the nozzle transfer device, and the suction device is provided.
The control device is
The heating wire is temporarily energized in a state where the nozzle at the advanced position is inserted into the bag mouth of the packaging bag and the bag mouth is pressed against the heating wire together with the nozzle by the pressing portion. The first process to control and
After the first treatment, a second treatment for controlling the suction device so as to suck the air inside the packaging bag from the tip of the nozzle.
After the second process, a third process of controlling the nozzle transfer device to convert the nozzle to the retracted position,
A vacuum packaging machine characterized in that it is possible to execute a series of vacuum packaging processes in which a fourth process for temporarily controlling the heating wire to be temporarily energized is sequentially executed after the third process. The vacuum packaging machine according to claim 1, wherein the nozzle is made of metal. This is a vacuum packaging method in which a plastic packaging bag containing an object to be packaged is sealed by welding the bag mouth in a degassed state.
The first step of sealing the bag mouth other than the insertion portion of the nozzle by heating the bag mouth of the packaging bag over the entire width with a heating wire with the nozzle inserted.
The second step of sucking the air inside the packaging bag from the tip of the nozzle to degas the packaging bag, and
The third step of moving the nozzle in the direction of retracting from the bag mouth, and
Vacuum packaging characterized in that by heating the bag mouth with the heating wire, a fourth step of sealing the portion of the bag mouth into which the nozzle was inserted in the first step is sequentially executed. Method.

Images