JP2013224175A - Bag-making and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new bag-making and packaging machine capable of increasing bulk density of contents without generating cracks and chipping while maintaining high packaging capability than conventional apparatuses.SOLUTION: A bag-making and packaging machine is configured to house an article G in a bag formed at a tube lower end while forming a band-like packaging material in a tubular shape and to apply a lateral seal between the top and bottom of the bag B. A pressing member P entering a conveyance passage of the tube T is provided at a side surface of the tube T at a position immediately above the bag B. During a period from the storage of the article G into the bag B to the lateral seal of the bag B, the pressing member P instantaneously enters the conveyance passage, and the article G stored therein is floated while inflating the bag B in a horizontal direction.

Description

The present invention is a so-called vertical type bag making in which a band-shaped packaging material is formed into a tube shape, and a bag formed at the lower end of the tube is filled with an article, and then the top and the ground of the bag are laterally sealed. Related to packaging machines.

When packaging snacks, a bag making and packaging machine that performs pillow packaging is used. Among them, when packaging light and bulky products such as potato chips, various methods disclosed in the following patent documents are used. Thus, attempts have been made to increase the bulk density in the bag.

For example, in the devices disclosed in Patent Documents 1 and 2 below, after sending compressed air into a tube filled with articles to inflate a bag at the lower end of the tube, the bag is vibrated to sink the contents. I have to.

Further, in the devices disclosed in Patent Documents 3 and 4, the contents in the bag are sunk by hitting the side or bottom surface of the bag with a stick or a plate.

Furthermore, in the invention disclosed in Patent Document 5, the upper end of the tube-shaped bag is sandwiched between the pair of gripping portions, and then the shaker is vibrated up and down to vibrate the bag at the lower end of the tube up and down. To sink the contents.

Japanese Utility Model Publication No. 45-4074 Japanese Utility Model Publication No. 64-4642 Japanese Utility Model Publication No. 54-28216 Japanese Utility Model Publication No. 52-92964 JP 2011-140331 A

However, the devices disclosed in Patent Documents 1 and 2 have a problem in that pressure air must be fed into the bag, which requires equipment such as an air compressor and increases costs. There is also a problem that the bulk density between articles having high frictional resistance cannot be increased simply by vibrating the bag.

In contrast, the devices disclosed in Patent Documents 3 and 4 do not require an air compressor or the like, so that the equipment cost can be suppressed, but the side and bottom of the bag are hit with a stick or plate, so the contents are There was another problem of cracking or chipping and reducing the product value.

On the other hand, in the invention disclosed in Patent Document 5, the shaker moves up and down while sandwiching the tube above the bag with a shaker, so that the bulk density can be increased without causing cracks in the contents of the bag.
However, since the upper part of the bag is sandwiched by the shaker, there is a problem that the contents are sandwiched by the shaker and the contents of the upper and lower bags are excessive or insufficient if the sandwiching timing is incorrect. Further, since the bag cannot be sealed while the bag is shaken up and down by the shaker, there is also a problem that the packaging capacity (number of bags / minute) cannot be increased.

The present invention has been developed in view of such problems, and can effectively increase the bulk density of the contents without causing cracks in the contents while maintaining a higher packaging capacity than before. It is an object of the present invention to provide a new bag making and packaging machine that can be used.

The bag making and packaging machine according to the first aspect of the present invention stores articles in a bag formed at the lower end of the tube while forming a belt-like packaging material into a tube shape, and applies a horizontal seal to the top and bottom of the bag. In the bag making and packaging machine, a pressing member is provided on the side surface of the tube at a position directly above the bag to enter the tube conveyance path and dent the tube by a predetermined amount, and the article is placed in the bag. Between the storage and the time when the horizontal seal is applied, the pressing member is caused to enter the tube conveyance path, and the concave capacity of the tube at that time causes the bag to swell in the horizontal direction. The value is set so that the article stored in the bag is lifted.

As shown in FIG. 1 (a), when the bag B laterally sealed at the lower end of the tube T is cut off from the lower end of the tube T, the lower end of the tube T becomes tapered as it goes downward. Figure 1 there
As shown in (b), the next article G falls, but when the article G is light like potato chips, the lower end of the bag B is sufficiently inflated as shown in FIG. Without storing the goods G. Therefore, the pressing member P having a predetermined size that is kept in a position immediately above the bag B at the timing when most of the articles G are stored in the bag B is, as shown in FIG. Enter the side with the speed and stroke described below. Then, the air pressure in the tube T is instantaneously increased to inflate the tapered bag B in the horizontal direction, and at the same time, the tube-shaped packaging material is lifted by the approach of the pressing member P to the side of the tube T, thereby The bag B and its contents (article G) sink into the expanded bag B while floating and diffusing. At that time, the articles G in the bag B are overlapped while transitioning in a direction with less contact resistance, so that they are converged in a more compact state without causing cracks.

Here, the size and the approach stroke of the pressing member P are the tube T produced thereby.
Is set so that the dent capacity is sufficiently larger than the expansion capacity of the bag B. This is because even if the tube T is recessed by a predetermined amount, a part of the air escapes upward, and the loss is taken into consideration.

The approach speed of the pressing member P is set to a speed at which the air pressure in the tube T is increased thereby instantaneously inflating the bag B at the lower end. For example, if the speed is set to about 1500 to 2500 mm / second, the bag B can be inflated instantaneously. However, this is an example, and since it depends on the material (the degree of hardness) of the bag B, it is preferable to use an actuator that can adjust the approach speed.

The bag making and packaging machine according to the second aspect of the present invention is to wrap the belt-like packaging material around a cylinder and form it into a tube shape, while storing the articles put into the cylinder in a bag formed at the lower end of the tube, In the bag making and packaging machine in which the top and bottom of the bag are laterally sealed, a pressing member is provided on the side surface of the tube at a position directly above the bag to enter the tube conveyance path and dent the tube. In addition, a shutter for trapping air in the tube is provided at the upper part of the cylinder connected to the tube, and the shutter is closed after the article is stored in the bag until a lateral seal is applied. The article stored in the pressing member is lifted while the pressing member enters the tube conveying path to inflate the bag at the lower end of the tube. And features.

In the second aspect of the invention, before the pressing member enters the tube conveyance path, the shutter above the cylinder connected to the tube closes and traps the air in the tube, and then the pressing member enters the tube conveyance path. Therefore, even if the bag B is not sufficiently inflated as shown in FIG. 1B, the air pressure in the tube is immediately increased, and the bag B is inflated as shown in FIG. The article G stored there can be lifted. Therefore,
In the second aspect of the invention, the size of the pressing member P and the entry stroke may be set so that the reduced capacity when the tube T is recessed is substantially equal to the expansion capacity of the bag B.

In these inventions, when the pressing member P enters the set stroke, it is immediately pulled back to the original standby position. Such a forward / backward movement is repeated until just before the bag B is laterally sealed. At that time, even if the tube T is continuously lowered, the time during which the pressing member P is in contact with the tube T is extremely short, and the tube lowering distance therebetween is also a slight amount. For example, even if the pressing member P is advanced and retracted by an air cylinder, the contact time per one time can be set to 0.05 seconds or less, and the descending distance of the tube T during that time is 216 in bag size (width × bag length). × 387mm,
Even if the packaging capacity is 40 bags / minute, the distance is 13 mm or less at most, so even if the tube T is continuously lowered, it can be operated without any trouble.

In these inventions, only one side of the tube T may be pushed by the pressing member P, or may be pushed from both sides of the tube T. In particular, in the first invention, the pressing member P
When pressing only one side, the stroke of the pressing member P is set to about half of the tube T diameter. This is because the article G that has fallen late is stored in the bag B without any trouble.

According to the present invention, while the bag at the lower end of the tube is inflated in the horizontal direction by the pressing member that enters the tube conveyance path, the article stored therein is lifted, and the contact resistance is reduced in the expanded bag. Since the article is allowed to sink while being moved, the bulk density can be increased without causing cracks in the article in the bag. Moreover, since the pressing member can be advanced and retracted while continuously transporting the packaging material, the bag can be made compact without reducing the operating speed.
Therefore, since the bag storage efficiency can be increased and the amount of packaging material used can be reduced, a more economical packaging machine can be provided.

Explanatory drawing of the solution principle of this invention. The principal part perspective view of the bag making packaging machine which concerns on one Embodiment of 1st invention. The operation | movement transition diagram of the bag making packaging machine which concerns on the said one Embodiment. The waist part perspective view of the bag making packaging machine concerning one embodiment of the 2nd invention. The operation | movement transition diagram of the bag making packaging machine which concerns on the said one Embodiment.

  Hereinafter, a bag making and packaging machine according to an embodiment of the present invention will be described with reference to the drawings.

<First embodiment>
FIG. 2: shows the principal part perspective view of the bag making packaging machine which concerns on one Embodiment of 1st invention. In FIG. 2, a bag making and packaging machine 1 includes a cylinder 3 connected to a lower opening of an upper hopper 2, a former 4 wound around the outer periphery of the cylinder 3 with an interval through which a packaging material F passes, and a cylinder A pair of left and right pull-down belts 5 that sucks the packaging material F wound around 3 and conveys it downward, a vertical sealing device 6 that thermally welds both side edges of the packaging material F wound around the cylinder 3, and An advancing / retreating device 7 disposed on the lower side of the cylinder 3 and a pair of front and rear lateral sealing devices 8 disposed below the device are provided. Here, the side on which the vertical seal device 6 is disposed is the front side, and the direction orthogonal thereto is the left-right direction.

Then, the belt-like packaging material F is wound around the cylinder 3 from below the guide roll 9 and formed into a tube shape, and both side edges of the tube-like packaging material F are overlapped on the front side of the cylinder 3, When the vertical sealing device 6 pressurizes and heats from above, the joint S of the tube T
1 is vertically sealed. A tube T is provided at the lower end of the cylinder 3.
A bag opening (not shown) for spreading the bag from the inner side to the outer side is provided in an opposing manner in the left-right direction.

The pull-down belt 5 includes a negative pressure chamber 51 having an opening provided on the side in contact with the tubular packaging material F, and a perforated belt 52 that circulates around the chamber 51. By circling around the chamber 51, the side surface of the tubular packaging material F is sucked and conveyed downward.

In addition, the vertical sealing device 6 is continuously heated and welded while pressing both side edges of the packaging material F wound around the cylinder 3 against the cylinder 3 by the metal belt 62 circulated in the vertical direction around the heater 61. It is supposed to be.

The advancing / retreating device 7 includes a pressing member P having a predetermined size and an actuator (not shown) that moves the pressing member P back and forth in the conveyance path of the tube T.

The pressing member P is formed of a flat plate material and is arranged so that the plate material is in surface contact with the tube T. In addition, as an actuator for moving it back and forth, a linear reciprocating mechanism such as an air cylinder or a linear motor does not take up space. Instead, a slider / crank mechanism or a rack / crank mechanism that converts rotational motion into reciprocating motion is used. A pinion or the like can also be used. However, in this embodiment, the air cylinder 71 is used to be attached to an existing apparatus.
(See FIG. 3).

The horizontal seal device 8 applies a horizontal horizontal seal to the tube T while pressing and separating the pair of front and rear seal jaws 81, 81, so that the top (upper seal portion) of the bottom bag B and the ground (lower portion of the next bag) The seal jaws may be of any type as long as they are simultaneously molded and then separated by cutting their borders. In this embodiment, the seal jaws 81 and 81 are D-shaped. A D-motion type that draws a motion trajectory and turns in opposite directions is used. In addition to this, a box motion type in which the seal jaws 81 and 81 sequentially circulate in the horizontal direction and a vertical direction, and a reciprocating type in which the seal jaws 81 and 81 move close to and away from each other in a horizontal plane can be used.

  Next, the operation of the first embodiment will be described with reference to FIG.

3 (1) to 3 (4) show the operation transition when the main part is viewed from the side. In each figure, the pull-down belt 5 is omitted, but FIG. As shown in FIG. 3 (4), the tube T is lowered at a constant speed. Further, the seal jaws 81 and 81 are also shown close to each other while drawing a D-shaped trajectory from a position apart from each other.

In these drawings, FIG. 3 (1) shows a state in which the article G put into the hopper 2 is dropping into the bag B at the lower end of the tube T through the cylinder 3. In this state, the pressing member P is
It is in the standby position on the side of the tube T.

And at the timing when most of the articles G are stored in the bag B, as shown in FIG.
The air cylinder 71 is driven to cause the pressing member P to enter the conveyance path of the tube T to about half the diameter. Then, the bag B is inflated instantaneously in the horizontal direction, and the bag B is lifted by the entry of the pressing member P into the tube T, whereby the article G stored in the bag B is lifted and inflated. It sinks while diffusing.

Subsequently, the air cylinder 71 operates in the reverse direction, and the pressing member P is pulled back to the original standby position as shown in FIG. Thereby, the articles | goods G accumulate on the bag B of the swelled state, and compactization is accelerated | stimulated.

When such an operation is repeated, for example, 2-3 times, the bulk density of the contents of the bag B (article G) is
It gets even higher. In the meantime, when the moving sealing jaws 81 and 81 approach each other and the sealing timing is reached (see FIG. 5 (4)), the driving of the air cylinder 71 is stopped to prepare for the next filling of the article G.

<Second embodiment>
FIG. 4: shows the principal part perspective view of the bag making packaging machine which concerns on one Embodiment of 2nd invention. This embodiment is different from the first embodiment in that a shutter S is provided on the upper part of the cylinder 3 above the Houma 4 and a bar-like member is used as the pressing member P. In other respects, the first embodiment is different from the first embodiment. The main part of the embodiment is used as it is. Therefore, here, the shutter S and the pressing member P will be described, and description of other main parts will be omitted.

The shutter S functions to confine air in the tube T by partitioning the hopper 2 and the upper part of the cylinder 3 of the first embodiment. Therefore, the shutter S includes a pair of slide members 10 and 11 that slide in one direction within a horizontal plane, and a drive mechanism (not shown) that moves the slide members 10 and 11 close to and away from each other within the horizontal plane.

Moreover, since the pressing member P does not need to dent the tube T as much as the dent capacity of the first embodiment,
Instead of the plate material of the first embodiment, a rod-shaped member is used. Of course, the flat plate material may be used as it is, and instead the entry stroke may be reduced, or both may be adjusted at the same time.

  Next, the operation of the second embodiment will be described with reference to FIG.

5 (1) to FIG. 5 (4) show the operation transition when the main part is viewed from the side. Like FIG. 3, the pull-down belt 5 is omitted, and FIG. 5 (1) to FIG. As shown in FIG. 5 (4), the tube T descends, and the seal jaws 81 and 81 approach each other while drawing a D-shaped locus.

In these drawings, FIG. 5 (1) shows a state in which the shutter S at the top of the cylinder 3 is opened and the article G put into the hopper 2 is falling through the cylinder 3 into the bag B at the lower end of the tube T. Is shown. In this state, the pressing member P is in a standby position on the side of the tube T.

And at the timing when most of the articles G are stored in the bag B, as shown in FIG.
The shutter S is closed, and then the air cylinder 71 is driven to cause the pressing member P to enter the transport path of the tube T to about half the diameter. Then, the bag B is inflated instantaneously in the horizontal direction, and the bag B is lifted by the entry of the pressing member P into the tube T, and the article G stored in the bag B is lifted up while the bag B is inflated. It will sink.

Subsequently, the air cylinder 71 operates in the reverse direction to pull the pressing member P back to the original standby position as shown in FIG. Thereby, the articles | goods G accumulate on the bag B of the swelled state, and compactization is accelerated | stimulated.

Such an operation is repeated 2 to 3 times with the shutter S closed. Then, the bulk density of the contents (article G) of the bag B is further increased. When the sealing jaws 81 and 81 being moved approach each other during that time and the sealing timing is reached (see FIG. 5 (4)), the shutter S is opened and the driving of the air cylinder 71 is stopped to Prepare for filling.

Therefore, in the second embodiment, even if the next article falls on the hopper 2, it can be dammed by the shutter S, so that the operating speed of the packaging machine can be increased.

In the above embodiment, the bag B is continuously lowered while the left and right sealing jaws 81 are continuously swiveled. Instead, the lateral sealing device 8 and the pull-down belt 5 are intermittently provided. The driving type is also applicable. In that case, the tube T is pressed by the pressing member P in a state where the bag B is stopped, but the effect is the same even in that case.

DESCRIPTION OF SYMBOLS 1 Bag making packaging machine 3 Cylinder B Bag F Packaging material G Article P Pressing member S Shutter T Tube

Claims (2)

In a bag making and packaging machine in which an article is stored in a bag formed at the lower end of the tube while forming a belt-like wrapping material into a tube shape, and a lateral seal is applied to the top and bottom of the bag, A pressing member is provided on the side surface of the tube at a position immediately above it to enter the tube transport path to dent the tube by a predetermined amount, and from when the article is stored in the bag to when a lateral seal is applied. In the meantime, the pressing member is caused to enter the tube conveyance path, and the recessed capacity of the tube at that time is such that the article stored in the bag is lifted while the bag is inflated horizontally. A bag making and packaging machine characterized by being set to a value. While winding the belt-shaped wrapping material around the cylinder and forming it into a tube shape, the articles placed in the cylinder are stored in a bag formed at the lower end of the tube, and a horizontal seal is applied to the top and ground of the bag. In the bag making and packaging machine, a pressing member is provided on the side surface of the tube at a position directly above the bag to enter the tube transport path to dent the tube, and at the top of the cylinder connected to the tube. Providing a shutter for trapping air in the tube, and closing the shutter between the time when the article is stored in the bag and the time when the horizontal seal is applied, and the pressing member is placed in the transport path of the tube. The bag making and packaging machine is characterized in that the article stored therein is lifted while inflating the bag at the lower end of the tube.

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