JP2614975B2 - Fusing welding plate blade for packaging seal and automatic packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing out a packaging film wound in a roll shape, inserting an article to be packaged therebetween, fusing the film at a predetermined position, and simultaneously welding the film to form a bag. The present invention relates to an automatic wrapping machine for wrapping an article to be packaged and a fusing and welding plate blade applied to the wrapping machine. More specifically, regardless of the shape and size of the article to be packaged, the upper and lower films on its side edges are securely welded. The present invention relates to an automatic wrapping machine provided with a seal device capable of performing the above-mentioned operations and a fusing and welding plate blade.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Utility Model Publication No. 62-1842
As disclosed in Japanese Unexamined Patent Publication No. 9-9, there is known an automatic packaging machine using a two-fold film developed and put to practical use by the present inventors. In this automatic packaging machine, the openings in the direction orthogonal to and parallel to the folding direction of the two-fold film were simultaneously sealed by an L-shaped sealing device having a film fusing and welding blade.

[0003] In order to reliably fuse the two films simultaneously with the fusing, it is important to prevent air from intervening between the two films at the fusing welding portion. If air is interposed between the films of the fusing and welding part, a peeling part occurs between the films in the working part of the fusing and welding blade, and the fusing and melting are performed without welding between the upper and lower two films. As a result, a so-called pinhole phenomenon in which sealing is not partially performed occurs, and the sealing is incomplete.

[0004] In particular, in the case of the above-mentioned L-shaped sealing device, since the longitudinal and lateral directions of the film flow are fused and welded at the same time, the air existing between the two-fold films during sealing is confined in the sealing portion and becomes a high pressure. Attempts to expand the sealing surface between the films. Furthermore, if the packaging is to be performed by the L-shaped sealing device with the film attached to the article to be packaged as much as possible, particularly when the article to be packaged is high, the film itself must be greatly deformed. Become. Such a situation creates an incomplete seal for the reasons described above. For this reason, conventionally, film holders are attached to both sides of the fusing welding blade, and the film holder and the seal pedestal are used to hold both sides of the fusing welding line and perform fusing while excluding air existing between the films. However, with such mechanical pressing, it is difficult to bring the two films existing between the film presses into a completely adhered state, even if high-precision machining is performed. It is often impossible to avoid. Therefore, in order to increase the distance between the seal line and the article to be packaged, it is usually necessary to use an unnecessarily wide film, which not only impairs the appearance of the package, but also increases the film consumption. .

On the other hand, as an automatic wrapping machine employing a sealing device other than the above-mentioned L-shaped sealing device, two long films are superimposed or an article to be wrapped is accommodated between the above-mentioned two-fold films. On the other hand, a method is known in which the front and rear seals in the film flow direction and the left and right side edges or one side edge seal are individually formed. A so-called I-seal device that uses a linear heat bar is known as the front and rear seal devices. As a side edge seal device, for example, two films are formed by a pair of left and right endless belts sandwiching a seal line. 2. Description of the Related Art An apparatus is known in which two films are welded with an upper and lower seal disk rotating along a seal line between left and right belts while being conveyed while being nipped. According to the sealing method of separately performing the front and rear seal and the side edge seal, at least one of the front and rear or left and right side edges of the film is always in the open state at the time of any preceding seal. Is less affected by the air present in the L-type sealing device.

[0006]

However, even in a packaging machine in which the front and rear seals and the side edge seals are separately formed by fusing and welding, both sides of the film sandwiching the seal line are mechanically held by a film press or an endless belt. The two films are still in a peeled state at the sealing portion corresponding to the middle portion thereof by the pressing force, and the gap exists between them, and the occurrence of the pinhole described above cannot be completely avoided. Is the actual situation.

That is, in the above-mentioned side edge sealing device, the side edges of the film to be sealed are pressed by a pair of left and right endless upper and lower endless belts so as to be brought into close contact with each other.
In order to obtain uniform contact, it is necessary to press the upper and lower belts on the film running side uniformly from above and below over the entire length of the belt.However, the endless belt is slackened, and between the left and right endless belts. Due to the arrangement of the upper and lower seal disks, it is extremely difficult to set a uniform contact mechanism.

In this type of automatic continuous packaging machine, the running of the film must be stopped once at least when sealing is performed in a direction perpendicular to the film flow direction.
At this time, it is necessary to temporarily separate the upper and lower seal disks from the film surface. If the seal disk is not separated from the film surface, the two film portions sandwiched by the upper and lower seal disks may be spread and the molten portion may spread and carbonize, and the portion may be in a pinhole state, Alternatively, the seal cannot be finished cleanly.

The present invention eliminates the above-mentioned disadvantages at the time of sealing by the conventional fusing and welding technique, employs a simple structure, and uniformly adheres the upper and lower films without applying unnecessary pressing force. Automatic packaging with a fusing welding plate blade suitable for fusing and welding an opening of a heat-welding film wrapping an article to be packaged in a state, particularly an opening edge parallel to the film flow direction. The purpose is to provide a machine.

[0010]

In order to achieve this object, the present invention provides a film roll of a packaging film wound up in a roll form, and a film drawn from the film roll can be used for packaging an article to be packaged. A film opening device that opens into a shape, a packaged article transporting device that introduces a packaged article between the films opened by the film opening device, and a film installed near the downstream end of the packaged article transporting device, A fusing welding blade applied to the sealing device of the automatic packaging machine having a sealing device for fusing the opening edge portion and fusing at the same time, protruding from one end of the heating unit main body, and vertically with or without the main body. Is adjustable, and is pierced at the edge of the film opening parallel to the film flow direction, and has a gradually narrower width at least toward the leading end. It is to characterized in that it comprises a cutting edge of the shearing blade shape arm upstream of the edge.

Further, according to a preferred embodiment, when the plate blade is a plate blade having a substantially V-shaped cross section having a blade surface on both sides, the blade edge angle between both blade surfaces is 5 to 15 °, and particularly, the blade edge is the same. Angle is 8 ~
12 ° is more desirable, and the edge shape may be formed only on the edge portion, or may be formed on the entire plate edge. Therefore, when the shearing blade shape has a blade surface formed on only one surface, the blade edge angle between the blade surface and the other surface is 2.5 to 2.5.
It is desirable to be within the range of 7.5 °.

Further, the present invention is provided with a fusing welding plate blade having the above configuration as the sealing device, and a pair of upper and lower feed rolls respectively along a sealing line in the film flow direction sandwiching the fusing welding plate blade. The automatic packaging machine is also characterized by being arranged, preferably, among the feed roll pairs arranged on the upstream and downstream sides of the film, the rotation speed of the downstream feed roll pair on the upstream side Set higher than the rotation speed of the feed roll pair.

[0013]

The operation of the present invention will be described by taking the case of automatic packaging by a two-fold film as an example. When the article to be packaged is placed on the article transporting apparatus and the automatic packaging machine is started, the film feed roll starts rotating, The two-fold film is pulled out from the film roll, the running direction is changed by 90 ° by the film opening device, and the front and back are reversed. At the same time, the two-fold film has a characteristic portion of the present invention while opening its cross section in a U-shape. Travel to the first sealing device. At this time, the articles to be packaged placed on the packaged article transport device driven through the opening of the two-fold film are sequentially introduced between the upper and lower films.

[0014] When the film portion containing the article to be packaged between the upper and lower films reaches the first sealing device from the article transporting device, the opening side edges thereof are arranged at predetermined intervals on the upstream side and the downstream side. It is sandwiched from above and below by the provided upper and lower feed roll pairs, and is fed to the downstream side in a tension state. At the same time, between the feed rolls on the upstream and downstream sides, the fusing welding plate blade of the present invention continuously fuses and fuses continuously along the seal line of the opening side edge parallel to the running direction of the film with the tip of the blade piercing. . Since the opening edges of the upper and lower films passing between the upper and lower feed roll pairs arranged on the upstream and downstream sides are tensioned in the flow direction, they are slightly wavy in the width direction and a uniform close contact state is maintained. You.

As a result, the sealing portion of the film maintains a uniform contact state with a certain width at least even when passing through the heating plate blade of the present invention. Is completely eliminated, and at the same time, due to the shearing blade shape and the cutting edge of the heating plate blade formed gradually narrower toward the lower end, a downward component acts on the film when it is melted, and the film is vertically moved. In addition to the function of bringing the two films into close contact with each other, the blade edge angle allows the film to shrink and move in the width direction at least at the film fusing edge on the side of the article to be packaged, and the vicinity of or near the plate blade side surface. The upper and lower films that move while contacting the side surfaces are reliably and beautifully melt-sealed, and a sufficient sealing function can be exhibited. Next, since the film fusing edge is pressed and flattened by the upper and lower feed roll pairs on the downstream side of the film and simultaneously cooled,
The seal is made firm and even.

If the cutting edge angle is larger than the upper limit, the film at the fusing edge escapes too much from the heating plate blade, so that the melting after the fusing is not continued and the film between the upper and lower films is sufficiently welded. Disappears. If the cutting edge angle is smaller than the lower limit value, the pressing of the fusing edge in the film width direction by the heating plate blade is reduced, and similarly, the welding between the upper and lower films is not sufficiently performed. In addition, the edge shape of the plate blade is V
In the case of a letter-like shape, the edge of the film in the fusing portion is pressed against the wrapped article side and the cutting edge (scrap) side by the blade surface at the time of fusing, thereby ensuring the welding of the upper and lower films. Since it is necessary to ensure the edge of the film on the side of the article to be packaged, in the present invention, the cutting edge has a cutting surface on only one side and a shearing blade shape having the other surface as a vertical surface. In this case, the blade is arranged so that the blade surface faces the article to be packaged.

In this way, when fusing and welding are performed by the first sealing device, the downstream end of the film has already been finished with the second seal at the time of the previous packaging, so that the film accommodated in the film is not sealed. When the packaged article is placed on the packaged article unloading device and conveyed, and when the upstream seal line traversing the film reaches the second sealing device, the driving of the feed roll and the packaged article unloading device is temporarily stopped. Pause the film transfer. When the transfer of the film is stopped, the fusing blade is lowered toward the seal receiving table of the second sealing device, and the upper and lower films are melted in the transverse direction along the rear seal line of the film and simultaneously welded, thereby completing the packaging.

At this time, it is a remarkable point of the present invention that the heating plate blade of the first sealing device remains at the same position. This is because the melted portion of the film is in contact with or close to the heating plate blade while the film is stopped, but the heat capacity of the portion along the film running line of the heating plate blade is small, so that the fusion zone of the film fusion portion is not expanded. This is also an effect unique to the plate blade of the present invention.

When the sealing by the second sealing device is completed, all the operating members such as the packaged article transport device, the packaged product unloading device, and the feed roll start operating, and the side edge seal for the next packaged item is started. Is started in the same manner as described above. The packaged articles that have been packaged are discharged by the packaged article unloading device, and if necessary, pass through a heat tunnel to shrink the film.

According to the automatic wrapping machine of the present invention, a pair of upper and lower feed rolls is installed following the fusing and welding plate blade to positively press and feed the blown molten film end. And flattened by welding,
At the same time, the seal is more reliable because it is cooled.
In addition, since the length of the seal by the sealing device can be set arbitrarily, it is possible to package slender articles to be packed or articles of different lengths with a single machine. The size can be reduced.

[0021]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show an automatic packaging machine according to a first embodiment of the present invention. Although the present embodiment is an example of an automatic packaging machine that seals and packs an article to be packed using a two-fold film, the present invention is not limited to the two-fold film. The present invention can be naturally applied to an automatic packaging machine that continuously fuses and welds the front and rear, left and right openings of the article while sequentially inserting the same.

In the illustrated example, the first sealing device 1 which is a feature of the present invention for sealing the opening parallel to the flow direction of the two-fold film 5 by fusing and welding, and the first sealing device 1 A not-shown article-conveying belt, which is a conveying device for feeding the film, a film delivery unit for holding a film roll, also not shown, and sending out a two-fold film 5 from the film roll, and wrapping the film 5 A film opening device 2 that opens in a possible shape;
A packaging article transfer belt 3 installed in parallel with the first sealing device 1 and a second section for fusing and welding an opening perpendicular to a film flow direction disposed close to the downstream side of the packaging article transfer belt 3. And two sealing devices 4.

In some cases, the two-fold film 5 is wound into a roll to form a film roll.
It is also possible to use a film roll obtained by winding a single wide film into a roll. In this case, it is necessary to install a film folding device between the film roll and the film opening device 2. is there.

The film opening device 2 has a well-known mechanism for reversing the folded film 5 and simultaneously opening and opening the film 5 in a U-shape. It consists of a pair of guide plates 7 and 8 and a supporting column, and the above-mentioned article-to-be-packaged conveyor belt is disposed between the upper and lower guide plates 7 and 8 in a state of being inserted therethrough. The upper and lower guide plates 7 and 8 are provided in parallel with each other with respect to the article-conveying belt. Also, the oblique sides 7 of the guide plates 7 and 8
a and 8a are 4 to the traveling direction of the packaged article transport belt.
The two-fold film 5 which is disposed so as to be at an angle of 5 ° and is in a close contact state sent out from the film roll is folded obliquely along the oblique sides 7a and 8a from above and below the upper and lower guide plates 7 and 8 to be turned over. The gap between the half films 5a and 5b is widened and opened in a U-shaped cross section, and the direction is changed by 90 ° with respect to the feeding direction from the film roll 6. At this time, an unillustrated packaged article conveying belt inserted between the guide plates 7 and 8 is located between the upper and lower half films 5a and 5b. Therefore, the articles to be conveyed at intervals on the article conveying belt are automatically and sequentially inserted between the two-fold films 5.

First sealing device 1 which characterizes the present invention
Is installed near the downstream end of the unpacked article transport belt (not shown) at the opening side edge of the two-fold film 5 opened in a U-shape as shown in each figure. First sealing device 1
Comprises a pair of first and second feed rolls 10, 11 arranged at predetermined intervals before and after in the film flow direction, and a film fusing and welding plate blade 12, which is the most characteristic of the present invention. The film fusing and welding plate blade 12 pierces the film running surface up and down between the first and second feed rolls 10 and 11 and on the film seal line with the blade edge 12a directed upstream in the film flow direction. It is arranged. The first sealing device 1 may be installed at one side edge parallel to the film flow direction as described above in the case of fusing and welding the two-fold film 5 as shown in the illustrated example. In an automatic wrapping machine of a system in which wrapping is performed and packaging is performed with an article to be wrapped therebetween, the first sealing device 1 is installed at each of left and right side edges in the film flow direction.

The film fusing welding plate blade 12 is provided integrally with and protrudes from the lower end of the heating section main body 13. The two-fold film 5 running between the feed roll pairs 10 and 11 arranged in the film flow direction includes:
By making the rotational speed of the downstream feed roll pair 11 slightly faster than that of the upstream feed roll, a tensile force acts to bring the upper and lower half films into close contact with each other. At this time,
Since tension is applied only to the side edges, the widthwise direction of the tensioned portion is wavy, and air movement from inside and outside of the film is well prevented. Therefore, since such an adhesive film is uniformly adhered as a whole, not only is there no air interposed between the upper and lower films in the subsequent fusing and melting step, but also the fusing and melting step in the intermediate portion is smoothly advanced. to enable.

In the illustrated example, the film fusing welding plate blade 1
Numeral 2 is a plate made of an aluminum alloy having a right-angled triangular shape with two sharp ends, and a side connecting the sharp ends has a blade width of about 8 mm and a blade angle of about 10 °.
The cutting edge 12a having a V-shaped cross section is formed.
The other plate blade main bodies 12b are flat surfaces having substantially parallel front and back surfaces. In this way, the cutting edge 12a having the V-shaped cross section is arranged obliquely downward with respect to the running of the film. It is more certain. Also,
When the cutting edge angle is set to about 10 ° as described above, the melted portion of the blown end is concentrated to move the blown end of the blown film 5 to the side of the article to be packaged which is wrapped in the film 5, thereby promoting welding. .

The film cutting welding plate blade 12 is connected to the heating unit main body 1.
3, the temperature is controlled to be higher than the melting temperature of the two-fold film 5 and lower than the combustion temperature. This temperature varies depending on the material of the film. For example, in the case of a polyethylene film, the temperature is set to about 200 ° C. In this case, the melting range of the film 5 is affected by the amount of piercing of the leading edge of the plate blade 12 into the film, and when the film 5 is melted more, the leading end of the plate blade 12 is positioned lower. The facing length of the main body 12b and the film 5 may be increased, and when the melting range is small, the plate blade 12 is raised to make the facing length of the main body 12b to the film 5 smaller. do it. Here, in order to fuse and fuse the film 5, the film 5 is melted in a certain range to form a molten portion at the edge portion of the stacked film 5. It is preferable that the melting range of the film 5 be some extent.

The first and second feed rolls 10,
Reference numeral 11 denotes a film feeding device, which is intermittently driven by a drive motor (not shown) via a known transmission mechanism (not shown), and synchronizes the film 5 with the packaged article transfer belt 3 in synchronization with the packaged article transfer belt 3. Operates to extend. In this embodiment, the rotation speed of the second feed roll 11 is slightly lower than the rotation speed of the first feed roll 10 so that the film 5 is not loosened between the first and second feed rolls 10 and 11 as described above. And a predetermined tension is applied to the film 5 between the first and second feed rolls 10 and 11 as described above. The tension may be appropriately set as long as the upper and lower films are securely adhered to each other. However, when the tension is increased, it is preferable that the installation interval between the first and second feed rolls 10 and 11 is as small as possible. Here, it should be further noted that the downstream feed roll 11 is
In addition to the feeding operation of the film 5, the film end which is melted by the heating plate blade 12 is pressed from above and below and cooled, so that the melted portion is more securely welded and the sealing function is sufficiently exhibited. It also has

The second seal installed following the first seal device 1
The sealing device 4 has substantially the same configuration as a known heat bar. The sealing device 4 presses both sides of the sealing line with a film retainer (not shown), and the folded film 5 is heated by the fusing blade 4a. At the same time as fusing,
The opening at the fusing end is welded. Therefore, a seal receiving base 4b is provided below the fusing blade 4a with the film 5 interposed therebetween. Further, as is well known, the second seal device 4 includes a driving air cylinder (not shown) for vertically moving the fusing blade 4a. Also,
On the downstream side of the sealing device 4, a packaged article carrying-out belt 9 for carrying out a packaged article to be packed is provided in proximity thereto. On the other hand, a winding roll (not shown) is provided below the first sealing device 1 for winding up the edge scrap portion of the film 5 blown off by the film fusing and welding plate blade 12. Are the feed rolls 10 and 11
It is driven in synchronization with the drive of.

According to the automatic wrapping machine of this embodiment having the above configuration, when the wrapped article 30 is placed on the wrapped article transport belt 2 and the automatic wrapping machine is started, the feed roll pair 1
At the same time as the rotation of 0 and 11 starts, the wrapped article transfer belt 3 also starts to rotate, the two-fold film 5 is pulled out from a film roll (not shown), the running direction is changed by 90 ° by the film opening device 2 and the front and back are reversed. At the same time, the vehicle travels to the first sealing device 1 while being opened in a U-shaped cross section. At this time, the packaged article 30 placed on the packaged article transport belt (not shown) driven through the opening of the double-folded film 5 is folded in half by the upper and lower half films 5a,
5b will be sequentially introduced.

The two-fold film 5 containing the article to be packaged 30 between the upper and lower half films 5a and 5b is transferred from the article to be packaged transport belt 2 to the to-be-packaged article transfer belt 3 and moved to the first sealing device 1. Then, one side edge of the opening of the two-fold film 5 is sandwiched from above and below by the first and second feed roll pairs 10 and 11, and the two-fold film 5 is fed to the downstream side. At this time, the upper and lower half films 5a and 5b are in close contact with each other between the first and second feed rolls 10 and 11, and are cut by the heating plate blade 12 along a seal line parallel to one side edge of the opening of the two-fold film 5. And welding is reliably performed.

At this time, the close contact is not made by mechanical external force such as a film presser or a belt, but by the tension acting on the upper and lower half films 5a and 5b and downward by the cutting edge 12a of the plate blade 12 at the time of fusing. This is due to the component force in the forward direction, and at the same time, it creates a wavy state in the width direction and reliably prevents the passage of air inside and outside the film. , And the adhesion performance does not deteriorate even by heating. As a result, the seal portion of the two-fold film 5 maintains a uniform contact state with a certain width at least until the seal portion passes through the heating plate blade 12 and reaches the feed roll pair 11. The air existing between the half films 5a and 5b is completely eliminated, so that the fusing and welding means having a simple structure such as the heating plate blade 12 can exhibit a sufficient and reliable sealing function. ing.

When one side edge of the two-fold film 5 is sealed by the first sealing device 1 to a predetermined length, the front end of the film is accommodated in the two-fold film 5 sealed in the previous packaging. The packaged articles 30 are also transferred from the packaged article transfer belt 3 to the packaged article carry-out belt 9 and conveyed, and pass through the first sealing device 1. This passage is detected by an unillustrated sensor, and when the rear seal line of the double-folded film 5 reaches the second sealing device 4, the first and second feed rolls 10, 11 and the packaged article unloading belt are there. 9 stops temporarily,
Pause film transfer.

When the transfer of the film is stopped, a cylinder (not shown) of the second sealing device 4 is operated to lower the fusing blade 4a toward the seal receiving table 4b. The half films 5a and 5b are welded and fused at the same time as the melting, and the packaging is completed. Here, it should be noted that, in the sealing device using the plate blade 12 of the present invention, when the second sealing device 4 operates, the film transfer is temporarily stopped as described above. It is not necessary to raise the plate blade 12 to retreat from the contact position of the film 5. This is because even when the film 5 is stopped, the heat capacity of the heating plate blade 12 is small, so that the melted portion of the film 5 does not needlessly increase. Of course, depending on the material of the film or the heating temperature of the plate blade, the plate blade may be temporarily retracted from the film surface when the film transfer is stopped.

When the fusing and welding of the rear end portion of the film by the second sealing device 4 is completed, the article-to-be-packaged conveyor belt, the packaged article transfer belt 3, the packaged article unloading belt 9, the first and second feeders (not shown) are again formed. All the operating members such as the rolls 10 and 11 start to operate, and the side sealing for the next article to be packaged 30 by the first sealing device 1 is performed in the same manner as described above. Further, the packaged article 30 whose packaging has been completed is carried out from the packaged article carry-out belt 9 and, if necessary, is passed through a heat tunnel (not shown) to perform processing such as shrinking on the film 5.

According to the automatic packaging machine of the present invention, the sealing length of the first sealing device 1 can be set arbitrarily, so that a single machine can be used for packaging elongated articles to be packaged or articles of different lengths. Therefore, unlike the conventional L-type sealer, the size of the sealing device can be reduced.

FIG. 4 shows a modification of the plate blade of the above embodiment. According to FIG. 4, the entire shape of the plate blade 12 is formed as a substantially 1/4 elliptical disk having a thickness of 4 mm, a short diameter of 25 mm and a long diameter of 140 mm. A cutting edge 12a having a V-shaped cross section with a width of 8 mm and a cutting edge angle of 10 ° is formed on the outer peripheral edge. The whole shape of the plate blade 12 may be a 1/4 perfect circle instead of a 1/4 ellipse. The plate blade 12 having this type of blade shape is particularly suitable for sealing a functional film such as an anti-fog film or a laminated film. Although welding is difficult, welding having sufficient sealing strength can be achieved by employing the blade shape having the above-described shape.

FIG. 5 shows another embodiment of the plate blade according to the present invention. As is clear from FIG. 5, the plate blade 12 is formed of a right-angled triangular pyramid having two sharpened vertices. This is an example in which a portion extends over the entirety, and both upper and lower cross sections are V-shaped. In the case of such a plate blade shape, unlike the above-described embodiment and the above-described modified example, when sealing a functional film, the sealing surface is not beautifully finished and is not suitable, but for example, a single film made of polyethylene or polypropylene is blown. Suitable for welding.

FIG. 6 does not use a V-shaped cross-section for the blade edge.
This shows an example of a plate blade having a blade surface on one side and a shearing shape with the other surface being a vertical surface.
When the cutting edge shape is V-shaped, the edges of the film in the fusing portion are pressed by the left and right blade surfaces against the article to be packaged and the cutting ears (scrap) side at the time of fusing, so that the welding of the upper and lower films is ensured. However, since it is necessary to ensure this welding at the edge of the film on the side of the article to be packaged, in the present invention, as shown in FIG. Is a vertical edge. In this case, the blade is disposed so that the blade surface faces the article to be packaged.

When the film 5 is melted and welded by the heating plate blade 12 having such a structure, the length of a portion of the running plate 5 facing the side face of the heating plate blade 12 along the seal line and the film cutting edge is determined. It is adjusted in an appropriate range by a vertical position adjusting means (not shown). Generally, when the amount of piercing increases, the length of the portion where the side surface of the heating plate blade 12 and the film 5 face each other increases, and the amount of welding after cutting the upper and lower films also increases, enabling a strong seal. . However, when the sealing surface is desired to be beautifully finished even if the sealing strength is weak, it may be set so that the tip of the heating plate blade 12 is slightly pierced.

[0042]

As is apparent from the above description, the automatic wrapping machine of the present invention is configured so that the side edges opened in the longitudinal direction of the film are fed out while applying a predetermined tension by the upper and lower feed rolls. The fusing edge can be extruded in the width direction of the film by the blade surface of the plate blade, especially in the fusing welding, in a state where the air present at the opening edge is completely eliminated. Since the force and the component force in the direction of bringing into contact act, a complete and reliable seal is realized, and since the welding portion is pressed and flattened by the feed roll following the fusing welding, and simultaneously cooled, A beautiful seal surface can be formed, and a simple structure allows sealing of any length as the film is fed out, so it is an elongated product to be packaged and a packaged product that varies in length. In the packaging is also one in which easily cope.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a schematic configuration of an automatic packaging machine using a two-fold film which is a typical embodiment of the present invention.

FIG. 2 is a side view showing a main part of a first sealing device of the automatic packaging machine.

FIG. 3 is a perspective view of the main part.

FIG. 4 is an explanatory view of a shape showing a modified example of the film fusing welding plate blade of the present invention.

FIG. 5 is a perspective view showing another embodiment of the film fusing welding plate blade.

FIG. 6 is a front view showing still another example of a film fusing welding plate blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st sealing apparatus 2 Film opening apparatus 3 Packaging article transfer belt 4 2nd sealing apparatus 4a Fusing blade 4b Seal receiving stand 5 Folded film 5a, 5b Half film 7,8 Upper and lower guide plates 7a, 8a Oblique side 9 Packaging article transfer Rolls 10, 11 Feed roll 12 Plate blade 12a Blade tip 12b Plate blade body 13 Heating unit body

Claims (6)

(57) [Claims] 1. A film roll of a packaging film wound up in a roll form, a film opening device for opening a film drawn from the film roll into a shape capable of packaging an article to be packaged, and the film opening device Automatic packaging having a packaged article transport device for introducing a packaged product between the opened films, and a sealing device installed adjacent to the downstream end of the packaged article transport device and welding a film opening edge. A fusing welding blade applied to the sealing device of the machine, the protruding edge protruding from one end of the heating unit main body, the vertical position of which can be adjusted together with or independently of the main body, and a film opening edge parallel to the film flow direction. It is placed in a piercing state in the part,
A fusing and welding plate blade for packaging seal, characterized in that a cutting edge having a shape of a shearing blade having a width gradually narrowing toward a front end and at least an edge on an upstream side of the film is provided. 2. The cutting blade according to claim 1, wherein the shape of the shearing blade has a substantially V-shaped cross section, and a cutting edge angle between the left and right cutting surfaces is 5 to 15 °.
The fusing welded plate blade as described. 3. The fusing welding plate blade according to claim 1, wherein said cutting edge portion of said shearing blade shape is formed only along an edge. 4. The fusing and welding plate blade according to claim 1, wherein the shape of the cutting edge is formed over the entire plate blade main body. 5. A sealing device comprising the fusing welding plate blade according to any one of claims 1 to 4, and a pair of upper and lower members along a sealing line in a film flow direction sandwiching the fusing welding plate blade. An automatic packaging machine comprising a feed roll. 6. The rotation speed of a downstream feed roll pair of the feed roll pairs arranged above and below in the film flow direction is set to be higher than the rotation speed of an upstream feed roll pair. Automatic packaging machine.