JPH09155994A - Method and device for cut sealing of heat adhesive film, and bag-making device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the thermally sealable width of the cut edge part of a heat adhesive film without causing any trouble with the transport of the film, when cutting the film and thermally sealing its cut edge part by shuttling a heating blade back and forth. SOLUTION: Plural stacked pieces of long heat adhesive film F are cut and their cut edge parts are thermally sealed by transporting the film F and shutting back and forth a heating blade 1 in a direction opposed to a receiving roller 2 to bring the blade 1 into contact with the film F over the peripheral face of the receiving roller 2. In addition, at least, one plane part 20 is provided on the peripheral face of the receiving roller 2, and when setting the heating blade 1 into contact with the film F, the plane part 20 of the receiving roller 2 is set in an opposite position to the heating blade 1 so that the film F is backed up by the plane part 20 of the receiving roller 2. Further, after the cutting of the film F and the thermal sealing process by the heating blade 1 are completed, the receiving roller 2 is rotated into a direction in which the film F is transported.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cutting seal of a heat-fusible film (cutting and heat-sealing of a cut edge portion thereof) when a bag is manufactured using a heat-fusible film made of, for example, a synthetic resin. Technology for efficiently and appropriately performing

[0002]

2. Description of the Related Art As is well known, there are various methods for cutting and sealing a heat-fusible film used for bag-making work, and specific examples thereof include upper and lower ones as shown in FIG. There is a method in which both sets of sealers (heating blades) 9a and 9b are opposed to each other and rotated so that the pair of sealers 9a and 9b sandwich the film F from the vertical direction. However, in such a method, although the high speed of the cutting and sealing work is excellent, it is necessary to match the peripheral speed v of the upper and lower two sealers 9a and 9b with the transfer speed v1 of the film F. It is difficult to adjust the operation of 9b, and the structure of the device becomes complicated. Moreover, the cutting pitch interval of the film F cannot be easily changed. Furthermore, since the cutting and the heat sealing are performed while the film F is being transported, it is difficult to improve the finished condition of the cut seal, particularly the finished condition of the heat seal.

Therefore, conventionally, as a cutting and sealing method different from the above, there is a method as shown in FIGS. 10 and 11, for example. That is, in the method shown in FIG. 10, the heating blade 1e is transferred while transferring a plurality of long films F stacked between the heating blade 1e and the receiving roller 2e which are provided to face each other. Is reciprocated in the direction opposite to the receiving roller 2e, and the heating blade 1e is applied to the film F on the peripheral surface of the receiving roller 2e.

Further, the method shown in FIG. 11 is a means in which a flat plate-shaped receiving stand 2f is fixedly provided in place of the receiving roller 2e shown in FIG. 10, and likewise in the case of FIG. The heating blade 1e is reciprocated in the direction opposite to the pedestal 2f, and the film F is placed on the upper surface of the pedestal 2f.
It is a method of applying the heating blade 1e to the.

According to such a method, since it is only necessary to reciprocate the heating blade 1e at a predetermined timing, the entire mechanism can be considerably simplified. Further, since the cutting and sealing work of the film F can be performed while the transportation of the film F is stopped, the finished state of the cutting seal can be improved.

[0006]

However, the conventional means shown in FIGS. 10 and 11 have the following problems.

That is, in the former means shown in FIG. 10 of the related art, since the receiving roller 2e having a cylindrical or columnar shape is used, the circumference of the receiving roller 2e with which the heating blade 1e abuts. The surface 29 has a predetermined radius of curvature R
It has a convex curved surface. Therefore, conventionally, when the heating blade 1e is applied to the film F, the film F
However, it was not possible to evenly back up all over a wide area by the receiving roller 2e, and the contact area of the heating blade 1e with the film F tended to be extremely small. As a result, conventionally, it is difficult to increase the heat-sealing width of the cut edges Fa and Fb of the film F, and for example, the strength of the seal portion of the bag manufactured by the cut-sealing operation of the film F can be sufficiently increased. It was difficult.

On the other hand, in the latter means shown in FIG. 11 of the prior art, since the upper surface of the pedestal 2f for backing up the film F is flat, unlike the former case,
The contact area of the heating blade 1e with the film F can be increased, and the width of the heat seal of the film F can be increased.

However, in the latter means, when the cut edges Fa and Fb of the cut and sealed film F are welded to the fixed pedestal 2f, the film F cannot be properly transferred. It was happening. That is, when the film F is cut and sealed on the upper surface of the pedestal 2f, the cut edge portion F of the film F melted and softened.
The a and Fb may adhere to the pedestal 2f. In this case, for the film F1 downstream of the pedestal 2f cut into a predetermined size, for example, the film F1 is forcibly pulled by an appropriate film transfer means (not shown) provided on the downstream side of the pedestal 2f. For example, the cutting edge Fb can be peeled off from the pedestal 2f. However, for the film F on the upstream side of the pedestal 2f, the cutting edge portion Fa cannot be peeled off from the pedestal 2f by the above-mentioned means. Therefore, in the latter means of the related art, even if the feeding rollers 3b and 3c are subsequently rotated to restart the transfer of the film F,
The film F adhered to the pedestal 2f cannot be properly transferred, and there has been a problem that an appropriate cutting and sealing operation cannot be continued.

The present invention has been devised under such circumstances, and in the case of cutting the heat-fusible film and heat-sealing the cut edges by reciprocating the heating blade. In the above, it is an object of the present invention to make it possible to increase the heat-sealing width of the cut edge portion of the film without causing an obstacle to the film transfer.

[0011]

DISCLOSURE OF THE INVENTION In order to solve the above problems, the present invention employs the following technical means.

That is, according to the first aspect of the present invention, a plurality of long heat-fusible films are stacked between the heating blade and the receiving roller provided so as to face each other. By transporting and reciprocating the heating blade in a direction facing the receiving roller, the heating blade is applied to the film on the peripheral surface of the receiving roller to cut the film and heat the cutting edge. A method for cutting and sealing a heat-fusible film for sealing, wherein at least one flat surface portion is provided on the peripheral surface of the receiving roller, and when the heating blade is applied to the film, the film is The flat portion of the receiving roller is opposed to the heating blade so as to be backed up by the flat portion of the receiving roller, and after the cutting and heat sealing of the film by the heating blade is completed, The receiving roller is characterized by rotating in the direction along the transfer direction of the film.

In the present invention, when the heating blade is applied to the film, the film is backed up by the flat surface of the receiving roller. Therefore, the flat surface of the receiving roller evenly backs up a wide range of the film. It is possible to increase the contact area of the heating blade with the film. Also,
The tip of the heating blade may be evenly contacted with the film at various places. Therefore, it is possible to increase the heat seal width of the cut edge portion of the film.

On the other hand, in the present invention, after the cutting of the film and the heat-sealing of the cut edges are completed, the heating blade and the receiving roller are rotated in order to rotate the receiving roller in the direction along the film transport direction. Even if the melted and softened cutting edge of the film located on the upstream side adheres to the flat surface of the receiving roller, it is possible to apply a pulling force toward the downstream side to the film by the rotating action of the receiving roller. Therefore, the cut edge of the film can be separated from the flat surface of the receiving roller. Therefore, it is possible to appropriately carry out the film transfer thereafter.

As described above, according to the present invention, the width of the heat-sealed portion applied to the film can be increased without causing a problem such as a trouble in transferring the film. Therefore, the width of the heat-sealed portion is large, which is most suitable for use in manufacturing a bag having high sealing strength.

According to the second aspect of the present invention, a film transfer means for transferring a plurality of long heat-fusible films stacked together and a film transferred by the film transfer means are sandwiched. A heating blade and a receiving roller provided to face each other, and this heating blade can cut the film on the peripheral surface of the receiving roller and heat-seal the cutting edge. In this way, the heat sealing film cutting and sealing device is capable of reciprocating in the direction facing the receiving roller, wherein the receiving roller has at least one flat surface portion formed on the peripheral surface thereof. It is characterized by being rotatable in a direction along the transfer direction of the film.

When the heating blade hits the film, the flat surface of the receiving roller faces the heating blade, and after the cutting and sealing of the film by the heating blade is completed, the receiving roller is moved in the transfer direction of the film. It may be configured so as to rotate in the direction along.

In the present invention, since the receiving roller is rotatable and at least one flat surface portion is formed on the peripheral surface thereof, when the heating blade is applied to the film, the flat surface portion of the receiving roller is applied. The film can be appropriately backed up by the flat portion of the receiving roller by facing the heating blade to the heating blade. Also,
When the cutting and heat sealing of the film are completed, the receiving roller is rotated along the film transfer direction at that time, and the cut edge of the film adhered to the flat surface of the receiving roller is peeled from the receiving roller. Can be made. Therefore, the cutting and sealing method of the heat-fusible film according to the present invention described above can be appropriately carried out, and the same effect as in the case of the cutting and sealing method of the heat-fusible film according to the present invention described above can be obtained. Can be expected.

In a preferred embodiment of the present invention, the receiving roller has a polygonal cross-section with a plurality of flat portions formed on the outer periphery thereof, and the heating roller is heated each time the film is cut and heat-sealed. It may be configured to rotate by a predetermined constant angle so that the flat surface portion facing the blade is sequentially changed.

According to this structure, the position of the flat surface of the receiving roller facing the heating blade is sequentially changed each time the film is cut and heat-sealed.
Unlike the case where the same flat portion is always opposed to the heating blade, it is possible to suppress wear of the flat portion caused by contact of the heating blade with the flat portion of the receiving roller, temperature rise and the like. Therefore, the service life of the receiving roller can be extended, and the flat portion of the receiving roller can be maintained at a temperature suitable for cutting and heat sealing the film to perform cutting and heat sealing of the film in a good finished state. The effect of being able to be obtained is obtained.

In another preferred embodiment of the present invention,
The heating blade, on both sides of the cutting blade provided at its tip, a flat portion having a predetermined width for heating and pressing the cutting edge of the heat-fusible film cut by this cutting blade is formed. It can be configured to be one.

According to this structure, when the heating blade is applied to the film for cutting and sealing, the film can be accurately cut by the cutting blade of the heating blade, and at the same time, the predetermined width on both sides of the cutting blade is achieved. By pressing the flat surface portion of the film against each cutting edge portion of the film, heat sealing of each cutting edge portion can be appropriately achieved. Therefore, it is more suitable for wide heat sealing.

In another preferred embodiment of the present invention,
Downstream of the heating blade and the receiving roller in the film transfer direction, each time the cutting and heat sealing of the film is completed, the upper and lower surfaces of the heat-fusible film on the side cut to a predetermined size by the heating blade are sandwiched. Then, the heat-fusible film may be provided with a film pulling means that intermittently operates so as to pull the heat-fusible film downstream in the film transport direction.

According to this structure, even if the film cut and sealed at the downstream side of the heating blade or the receiving roller is heat-sealed to the receiving roller, the film pulling means can be used. Since this film can be forcibly pulled to the downstream side, the film can be peeled from the receiving roller and appropriately transferred.

In another preferred embodiment of the present invention,
The receiving roller may be drivingly connected to the film pulling means so as to rotate intermittently in conjunction with the film pulling means each time the cutting and heat sealing of the heat-fusible film are completed.

According to this structure, it is possible to make the receiving roller accurately perform the predetermined intermittent rotation operation by utilizing the driving force of the film pulling means for performing the intermittent drive. Therefore, it is not necessary to separately provide a dedicated drive source for rotating the receiving roller, and there is an effect that the configuration of the entire apparatus can be simplified.

According to a third aspect of the present invention, a bag-making apparatus is characterized in that it is provided with the above-mentioned cutting and sealing apparatus for the heat-fusible film. In the present invention, when a bag is produced by subjecting a heat-sealable film to a cutting seal, the same effect as that obtained by the above-described heat-sealable film cutting and sealing apparatus can be expected, and the seal strength is high. The bag can be manufactured efficiently and appropriately.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is an explanatory view showing an example of a bag-making apparatus provided with a heat-sealable film cutting and sealing apparatus to which the present invention is applied. FIG. 2 is a plan view taken along the line XX of FIG. FIG. 3 is an explanatory view showing a process of manufacturing a bag by the bag manufacturing apparatus shown in FIG.

Referring to FIG. 3, the basic schematic structure of the bag-making apparatus according to the present embodiment will be described. The bag-making apparatus comprises a heating blade 1 which is reciprocally movable in the vertical (vertical) direction, and the heating blade. 1 is provided with a receiving roller 2 provided below the heating blade 1. Between the heating blade 1 and the receiving roller 2, a long heat-fusible synthetic resin film F, which is folded in two and formed in an upper and lower two-ply structure, is intermittently provided at predetermined intervals. Be transferred. When the transfer of the film F is stopped, the heating blade 1 descends and hits the film F, thereby cutting the film F in the width direction and cutting edges of the upper and lower films overlapping each other at this cutting portion. It is designed to be heat-sealed between each other. The film that has been cut and heat-sealed at the cut edges by the above steps becomes the bag A. The bag A has a bottomed shape in which the bottom portion a is folded back, and the left and right side edges b, b are heat-sealed, and an opening c is formed on one end side. .

In FIG. 1 and FIG. 2, this bag-making apparatus has a pair of upper and lower feed rollers 3 and 3 for transferring the film F other than the heating blade 1 and the receiving roller 2.
a, a plurality of upper and lower sets of film pulling rollers 5 and 5a, a film transfer mechanism 4, and the like. Each of these parts is appropriately supported by being attached to the frame 6 of the bag making apparatus.

The pair of feed rollers 3 and 3a are for transferring the two-folded synthetic resin film F described in FIG. 3 between the heating blade 1 and the receiving roller 2. A motor M1 such as a servomotor is drivingly connected to both or either of the pair of feed rollers 3, 3a.
Is intermittently driven and rotated by a predetermined rotation speed or a predetermined rotation angle by the driving force of the motor M1, and the film F is intermittently transferred by a predetermined constant dimension. On the upstream side of the feed rollers 3 and 3a, a film folding means (not shown) for folding the long film F in two is provided, and the film F is folded in two to form a pair. It is supplied between the feed rollers 3 and 3a.

As described above, the heating blade 1 is for cutting the film F in the width direction and for heat-sealing the cut edge portion thereof, and as shown in FIG. A cutting blade 10 having a sharp shape for cutting is cut out. Also, on the left and right sides of this cutting blade 10,
Planar portions 11 and 11 having a predetermined width for heating and pressing the cut edges Fa and Fb of the film F are formed. The cutting blade 10 and the flat surface portions 11 and 11 are formed in series so as to extend in the width direction of the film F. The protruding dimension H of the cutting blade 10 is, for example, about 0.5 mm,
The width L of each flat surface portion 11 is, for example, about 1 mm. Each of these dimensions may be appropriately increased or decreased depending on the thickness of the film F or the request for the heat-sealing width applied to the film F.

In FIG. 1, the heating blade 1 includes a heater 12 for heating the cutting blade 10 and each flat surface portion 11.
Etc. are built in. Therefore, the cutting blade 10 is
After the film F is heated and softened, a shearing force is applied, so that the film F is so-called melt-cut.

The heating blade 1 is reciprocally movable in the vertical direction by an appropriate drive mechanism 13, and the receiving roller 2
It is configured to approach and depart from. As the drive mechanism 13, various mechanisms such as a link mechanism, a reciprocating cylinder, and a cam mechanism can be adopted. The drive operation of the drive mechanism 13 is synchronized with the rotation operation of the feed rollers 3 and 3a. ing. That is, the driving mechanism 13 is set in timing so that the heating blade 1 comes down toward the receiving roller 2 side and hits the film F when the rotation operation of the feed rollers 3 and 3a is stopped.

The receiving roller 2 has a polygonal cross section, for example, a regular octagon, and a plurality of flat portions 20 are formed on the peripheral surface thereof. The receiving roller 2 is drivingly connected to a driving unit of a film tensioning roller 5a that rotates intermittently as described later, so that the receiving roller 2 is intermittently moved in a direction (arrow N2 direction) along the film F transport direction (arrow N1 direction). It is provided so as to rotate.

Specifically, the support shaft 21 of the receiving roller 2 is
A gear G3 drivingly connected to a gear G1 attached to the support shaft 50 of the film tension roller 5a through an intermediate gear G2 is attached to the film tension roller 5a.
When a is driven and rotated, the receiving roller 2 is also rotated by a certain angle accordingly. The rotation operation of the receiving roller 2 is started when the cutting of the film F by the heating blade 1 and the heat sealing are finished and the heating blade 1 starts to move upward. Further, when the receiving roller 2 has a regular octagonal sectional shape, the receiving roller 2 is rotated by 45 degrees and stopped. Therefore, in the receiving roller 2, each time the cutting of the film F and the heat-sealing work are completed once, the film is rotated by 45 degrees, and each of the flat portions 20 at a total of eight positions sequentially faces the heating blade 1. It will change to the position.

The support shaft 21 of the receiving roller 2 is formed, for example, in a tubular shape as shown in FIG. 2, and the roller main body portion of the receiving roller 2 is opened from the opening 21a at the end of the supporting shaft 21. A cooling fluid for cooling the receiving roller 2 can be supplied to the inside of the. For example, air or water is used as the cooling fluid. The lower the temperature of these fluids, the more preferable, but it may be about room temperature.

The plurality of sets of film tension rollers 5, 5a
Has projections 51 and 51a on its outer peripheral surface, and is intermittently rotated in the direction of arrow N3 by driving a motor M2 connected to the support shaft 50 of one film pulling roller 5a. These film tension rollers 5,
The intermittent rotation operation of 5a is synchronized with the ascending / descending operation of the heating blade 1 and is as follows. That is, these film pulling rollers 5 and 5a are always provided with the protrusions 5
1, 51a is in a stand-by state in which it is stopped in an angular posture where it does not come into contact with the film F, but when the cutting of the film F by the heating blade 1 and the heat sealing work are completed and the heating blade 1 starts to rise, at that point It rotates one rotation in the direction of the arrow N3 and stops the rotation at the original angle. During this rotation operation, as shown in FIG. 6, the film F1 in which the pair of upper and lower protrusions 51, 51a is cut
Is sandwiched and pulled and transferred in the direction of arrow N4.

The film transfer mechanism 4 is configured such that a plurality of sets of upper and lower endless belts 40, 40a can be circulated and moved. As shown in FIG. 2, the lower belt 40a is fixed to a pulley 41a mounted rotatably relative to a support shaft 50 supporting the film tension roller 5a and a drive shaft 42 provided downstream thereof. The belt 40a is freely circulated by being driven by a motor M3 which is wound around both of which is attached to the pulley 43a and which is drivingly connected to the drive shaft 42. For the upper belt 40 on one side,
Like the lower belt 40a, the two pulleys 41, 43
It is wound around and is rotatably driven in conjunction with the lower belt 40a. These upper and lower belts 4
Unlike the film pulling rollers 5 and 5a, the 0 and 40a are constantly driven to circulate in the direction of the arrow N4, and the film sent from both of them is sandwiched between the upper and lower sides of the film. Can be transferred to the outside. However, the gap between both of the plurality of sets of belts 40, 40a is smaller toward the downstream side, and a relatively large gap S is formed at the position on the upstream side. Of course,
Similar gaps are formed between the film pulling rollers 5 and 5a. If such a gap S is provided, the cut film is cut into these belts 40, 40.
It can be appropriately led to a.

Next, an example of the method for cutting and sealing the heat-fusible film according to the present invention using the above apparatus will be described.

First, in FIG. 1, a long film F folded in two is intermittently transferred by a pair of upper and lower feed rollers 3, 3a, and the film F is fed between both the heating blade 1 and the receiving roller 2. Supply. On the other hand, the heating blade 1 is lowered so as to hit the film F as shown in FIG. 4 when the film feeding by the feed rollers 3 and 3a is stopped. On this occasion,
The receiving roller 2 has one flat surface portion 20 provided on the peripheral surface thereof facing upward. Therefore, this flat portion 2
With 0, it is possible to evenly back up the peripheral portion of the film that the heating blade 1 hits in a wide range.

Further, as described with reference to FIG. 5, at the tip of the heating blade 1, two flat surface portions 1 with the cutting blade 10 sandwiched therebetween are provided.
Since the films 1 and 11 are formed, it goes without saying that the film F can be appropriately cut, and
The entire surface of 11 can be pressed against the surface of the film F and heated. Therefore, the cut edge F of the film F
It is possible to appropriately heat-seal (heat-seal) the films a and Fb which are vertically overlapped with each other over a wide range substantially the same as the width L of each flat surface portion 11. When the heat sealing is performed in such a wide area, the sealing strength of the film F can be increased correspondingly, which is advantageous in manufacturing a bag having high strength.

When the film F is cut and heat-sealed as described above, the cut edges Fa and Fb of the film F in the heat-softened state are bonded to the flat surface portion 20 of the receiving roller 2 and the heating blade 1. It may happen. However, such a situation is resolved as follows.

That is, when the cutting and sealing work of the film F as described above is completed, the heating blade 1 is started to rise thereafter. At the same time, as for the receiving roller 2, as shown in FIG. Rotate in the direction.
When the receiving roller 2 is rotated in this way, if the cutting edge portion Fa of the film F is adhered to the flat surface portion 20 of the receiving roller 2, the receiving roller 2 is cut by the cutting edge portion of the film F. Since Fa is pulled to the downstream side of the film transfer, the cut edge portion Fa can be forcibly peeled from the flat surface portion 20. Therefore, after that, the feed rollers 3, 3
When the rotating operation of a is restarted, the film F can be appropriately transferred to the downstream side.

When the receiving roller 2 is rotated, it is desirable to stop the rotations of the feed rollers 3 and 3a so that the film F is not transported downstream as the receiving roller 2 rotates. However, the present invention is not limited to this. For example, if the receiving roller 2 is rotated at a higher speed than that during the rotation operation of the feed rollers 3 and 3a, a tensile force can be applied to the film F, and the film F attached to the receiving roller 2 can be applied.
It is possible to appropriately peel off the cut edge portion Fa.

The receiving roller 2 completes its rotating operation when it has rotated 45 degrees. Therefore, thereafter, in this receiving roller 2, another flat surface portion 20 (20b) located next to the flat surface portion 20 (20a) becomes the upper surface position, and this flat surface portion will be used in the cutting and sealing operation of the next film. 20b will back up the film F. As described above, in the receiving roller 2, since the flat surface portion 20 that backs up the film F rotates every time the film F is cut and sealed once, only the specific flat surface portion 20 is contacted with the heating blade 1. There is no problem such as significant wear or increase in temperature.

On the other hand, the film pulling rollers 5 and 5a are driven and rotated at the same time as the receiving roller 2. That is, these film pulling rollers 5 and 5a are
When the cutting seal is finished, it makes one rotation in the direction of the arrow N3. At that time, the projections 51, 51a of the film pulling rollers 5, 5a sandwich the upper and lower surfaces of the cut film F1 to sandwich the film F1. Transfer to the downstream side.
Therefore, the cutting edge Fb at the rear end of the film F1
However, even if it is adhered to the flat surface portion 20 of the receiving roller 2 or the heating blade 1, the film F1
By pulling, the cutting edge portion Fb can be forcibly separated from the receiving roller 2 and the like. As a result, the projections 51 of the film pulling rollers 5, 5a,
The film F1 pulled by 51a can then be sandwiched between the upper and lower belts 40, 40a of the film transport mechanism 4 and appropriately transported to the downstream side.

As described above, the cooling fluid is supplied to the inside of the receiving roller 2, and the flat portions 20 on the peripheral surface thereof are cooled. Therefore, it is possible to prevent the cut edges Fa, Fb of the cut and sealed film F from being melted and softened more than necessary, and the cut edges Fa, F
It is possible to reduce the risk that b will be unduly adhered to the flat surface portion 20 of the receiving roller 2 or the like.

In the above bag making apparatus, the synchronized operations of the above-mentioned respective parts are automated. Therefore, the bag A can be manufactured smoothly and efficiently. The receiving roller 2
Since a drive source for intermittently driving the film pulling rollers 5 and 5a is used as a drive source for intermittently rotating the roller, it is not necessary to additionally provide a drive source dedicated to the receiving roller. It is possible to simplify the configuration. However, the present invention is not limited to this, and a drive source dedicated to the receiving roller may be provided.

FIG. 7 is a cross-sectional view of an essential part showing another example of the heat-sealable film cutting and sealing apparatus to which the present invention is applied. In the configuration shown in the figure, the flat surface portion 20 of the receiving roller 2 is provided with a concave groove portion 22 into which the tip end side of the cutting blade 10 of the heating blade 1 can be partially inserted. With such a configuration,
Avoiding the cutting blade 10 from directly contacting the receiving roller 2,
It is possible to bring the flat portions 11, 11 of the heating blade 1 into contact with the film F more appropriately. The flat surface portion 20 of the receiving roller 2 according to the invention of the present application may be in a form in which the concave groove portion 22 is formed as described above.

FIG. 8 is a cross-sectional view of an essential part showing another example of the heat sealing film cutting and sealing apparatus to which the present invention is applied. In the configuration shown in the figure, only one flat portion 20 is provided on the peripheral surface of the receiving roller 2. In the present invention, the receiving roller 2 does not necessarily have to be formed in a polygonal shape, and the point is that at least one flat surface portion is provided. When the receiving roller 2 is provided with the flat portion 20 at only one location, the receiving roller 2 is rotated, for example, by 360 degrees to cut the film F and heat seal it. The flat surface portion 20 may be opposed to the heating blade 1.

The present invention is not necessarily limited to the contents of the above-mentioned embodiment. The specific configurations of the heat sealing film cutting and sealing device and the bag making device according to the present invention can be changed in various ways. Of course, the cutting and sealing apparatus for the heat-fusible film according to the present invention does not have to be incorporated in a part of the bag-making apparatus, and may be incorporated in a packaging apparatus other than the bag-making apparatus for use. Further, it may be used alone.

Further, the specific contents of each work step of the method for cutting and sealing the heat-fusible film according to the present invention can be changed in various ways. The film to be cut and sealed only needs to have heat fusion property, and its specific material is not limited.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a bag making apparatus provided with a heat sealing film cutting and sealing device to which the present invention is applied.

FIG. 2 is a plan view taken along the line XX of FIG.

FIG. 3 is an explanatory view showing a process of manufacturing a bag by the bag manufacturing apparatus shown in FIG.

FIG. 4 is a cross-sectional view of essential parts showing a state when the film is cut and sealed.

5 is an enlarged cross-sectional view of a main part of FIG.

FIG. 6 is a cross-sectional view of essential parts showing an operating state after the cutting and sealing of the film is completed.

FIG. 7 is a cross-sectional view of essential parts showing another example of a heat-sealable film cutting and sealing device to which the present invention is applied.

FIG. 8 is a cross-sectional view of a main part showing another example of the heat sealing film cutting and sealing device to which the present invention is applied.

FIG. 9 is a principal part explanatory view showing an example of a conventional cutting and sealing method for a heat-fusible film.

FIG. 10 is an explanatory view of a main part showing another example of a conventional method for cutting and sealing a heat-fusible film.

FIG. 11 is an explanatory view of a main part showing another example of a conventional method for cutting and sealing a heat-fusible film.

[Explanation of reference symbols] 1 heating blade 2 receiving roller 3,3a feeding roller (film transferring means) 5,5a film tensioning roller (film tensioning means) 10 cutting blade 11 flat surface portion (heating blade object) 20 plan view (of receiving roller ) F film (heat fusion film)

Claims (8)

[Claims] 1. A long heat-fusible film having a plurality of stacked layers is transferred between a heating blade and a receiving roller which are provided so as to face each other, and the heating blade is transferred to the receiving roller. By reciprocating in opposite directions, hitting the heating blade on the film on the peripheral surface of the receiving roller, cutting the heat-fusible film to cut the film and heat seal the cutting edge In the sealing method, at least one flat surface portion is provided on the peripheral surface of the receiving roller, and when the heating blade is applied to the film, the film is backed up by the flat surface portion of the receiving roller. The flat portion of the receiving roller is made to face the heating blade, and after the cutting and heat sealing of the film by the heating blade are completed, the receiving roller is moved in the film transfer direction. A method for cutting and sealing a heat-fusible film, which comprises rotating the heat-fusible film in a direction along the direction. 2. A film transfer means for transferring a plurality of long heat-fusible films stacked together, and a film transfer means provided so as to face each other so as to sandwich the film transferred by the film transfer means. A heating blade and a receiving roller are provided, and the heating blade faces the receiving roller so that the film can be cut and the cutting edge can be heat-sealed on the peripheral surface of the receiving roller. A device for cutting and sealing a heat-fusible film, which is reciprocally movable in any direction, wherein the receiving roller has at least one flat surface portion formed on its peripheral surface, and a direction along the transfer direction of the film. A heat-sealable film cutting and sealing device, which is freely rotatable. 3. The receiving roller has a flat surface facing the heating blade when the heating blade hits the film, and the film after the cutting and heat sealing of the film by the heating blade is completed. The cutting and sealing apparatus for a heat-fusible film according to claim 2, wherein the cutting and sealing apparatus is provided so as to rotate in a direction along the transfer direction of the film. 4. The receiving roller has a polygonal cross section in which a plurality of flat portions are formed on the outer periphery thereof, and the flat portion facing the heating blade is cut each time the film is cut and heat-sealed. The cutting and sealing apparatus for a heat-fusible film according to claim 2, which is provided so as to be rotated by a predetermined constant angle so as to be sequentially changed. 5. The heating blade has a flat surface of a predetermined width on both sides of a cutting blade provided at a tip thereof for heating and pressing a cutting edge portion of the heat-fusible film cut by the cutting blade. 5. A portion is formed, and the portion is formed.
A cutting and sealing apparatus for a heat-fusible film according to any one of 1. 6. The heat-fusible film on the downstream side of the heating blade and the receiving roller in the film transfer direction, which is cut to a predetermined size by the heating blade each time cutting and heat-sealing of the film is completed. 6. The heat-sealing property according to any one of claims 2 to 5, further comprising film pulling means for sandwiching both upper and lower surfaces of the film and intermittently operating so as to pull the heat-fusible film downstream in the film transport direction. Film cutting and sealing device. 7. The receiving roller is drivingly connected to the film tensioning means so as to rotate intermittently in association with the film tensioning means each time cutting and heat-sealing of the heat-fusible film is completed. Item 7. A cutting and sealing apparatus for a heat-fusible film according to Item 6. 8. A bag manufacturing apparatus comprising the cutting and sealing apparatus for a heat-fusible film according to claim 2.