JP2021017270A - Device for making crease on film and method for making crease on film - Google Patents

Abstract

To provide a device for making a crease on a film capable of finely making a crease on a film without causing thermal damage.CONSTITUTION: A device 21 for making a crease on a film is arranged on a conveyance path of a packaging film 5 in a film supply device 2 of a packing machine and includes a pair of anvils 38 and an ultrasonic horn 35 which are arranged with the packaging film interposed therebetween. The anvil is disc-like and includes a projection 38a on a side peripheral surface brought into contact with the packaging film. The ultrasonic horn is disc-like and includes a concave groove 35a at a position opposite to the projection. Ultrasonic vibration is applied to a film part of the packaging film interposed between the projection and the concave groove to make a crease on the film.SELECTED DRAWING: Figure 2

Description

The present invention relates to a film polygonal line habituation device and a film polygonal line habituation method.

For example, a wrapping machine wraps a product in a band-shaped wrapping film and seals or cuts a predetermined part to manufacture a wrapping body, and is arranged on the upstream side of the wrapping machine body to sequentially supply the products to the wrapping machine body. It is provided with a product supply device for supplying a band-shaped packaging film to the main body of the packaging machine, and the like.

For example, in a pillow wrapping machine, a band-shaped wrapping film continuously supplied from a film supply device is formed into a tubular shape by a bag making machine arranged on the carry-in side of the wrapping machine main body, and the tubular shape formed in the tubular shape. The product supply device sequentially supplies the products into the packaging film of the above at predetermined intervals. Then, in the main body of the wrapping machine, the overlapping end of the tubular wrapping film is sealed while the tubular wrapping film containing the product moves, and further, the front and rear products are sealed and cut in the lateral direction. To manufacture the packaging.

By the way, depending on the shape of the product stored in the finished package, the finished package does not have corners and has a rounded shape. Therefore, in order to give a feeling that the corners of the completed package are angular without being influenced by the shape of the product, for example, a predetermined position of the strip-shaped packaging film being transferred in advance, such as the device disclosed in Patent Document 1 and the like. In addition, various devices have been proposed for creating a crease that extends parallel to the traveling direction of the film.

Jikken 7-23361 Gazette

Various conventional film folding devices have been proposed in which a film is sandwiched from both sides by using a pair of heating type rollers, and the film is heated and pressurized to form a folding habit. Then, for example, even when the device is temporarily stopped at lunch time or for other reasons, the roller keeps the film sandwiched. Therefore, the roller is in contact with the film for a long time until the operation is restarted, and the same film portion continues to overheat, so that the film portion damaged by the heat shrinks, cuts, or has holes.

On the other hand, if the roller is controlled to be separated from the film at the time of temporary stop, the roller may come into contact with a place different from that at the time of stop when the operation is restarted, and the continuity of the broken line habit may not be obtained. Therefore, as described above, the rollers are kept in contact with the film even during the temporary stop, and the film portion damaged by heat is not used as a defective product in the packaging body, so that the packaging film or the like is wasted.

Further, when a pair of heating type rollers are used, even if the heating is stopped during the pause, the temperature of the roller surface does not drop immediately, so that the film portion in contact with the rollers during the pause is , It is heated for a longer time than usual and is damaged by heat.

The above-mentioned problems are described as independent of each other, and the present invention does not necessarily have to be able to solve all of the described problems, as long as at least one problem can be solved. In addition, we have the intention to acquire the rights to the structure for solving this problem independently by divisional application, amendment, etc.

In order to solve the above-mentioned problems, the film folding line habit device of the present invention includes (1) a wrapping machine main body, a film supply device for continuously supplying a strip-shaped wrapping film to the wrapping machine main body, and the above. Used in a wrapping machine equipped with a product supply device that is arranged on the upstream side of the wrapping machine main body and supplies products to the wrapping machine main body, and has a habit of breaking a film that is arranged on the upstream side of the wrapping machine main body. The device includes a pair of anvils and an ultrasonic horn arranged so as to sandwich the packaging film, the anvil has a protrusion on a surface in contact with the packaging film, and the ultrasonic horn is attached to the protrusion. A concave groove is provided at a position facing each other, and ultrasonic vibration is applied to the film portion of the packaging film sandwiched between the protrusion and the concave groove to form a broken line habit.

In this way, the film portion of the packaging film sandwiched between the protrusion and the concave groove is pressed by ultrasonic vibration in a state of being pushed into the concave groove by, for example, the tip of the protrusion, and a broken line habit is formed. Further, for example, even if the ultrasonic horn and the anvil are kept in contact with each other while the transportation of the packaging film is temporarily stopped, the ultrasonic vibration is stopped or the film is vibrated with a small amplitude that does not affect the film. You can prevent the film from being damaged. Furthermore, since the amplitude value can be changed instantly, the film portion that comes into contact with the protrusions / grooves immediately after the pause is not subjected to vibration for a long time.

(2) The anvil has a disk shape that is rotatably arranged, and the protrusions may be configured so as to project outward from the disk-shaped side peripheral surface and be continuous in the circumferential direction. In this way, for example, if the transport direction of the packaging film and the rotation direction of the anvil are made equal, the packaging film can be smoothly transported.

(3) The ultrasonic horn has a disk shape that is rotatably arranged, and the concave groove may be configured to be continuous outward in the circumferential direction on the disk-shaped side peripheral surface. In this way, for example, if the transport direction of the packaging film and the rotation direction of the ultrasonic horn are made equal to each other, the packaging film can be smoothly transported.

(4) A protrusion having a smaller protrusion amount than the protrusion is formed next to the protrusion of the anvil, and the packaging film is formed between the protrusion and the unformed region of the concave groove of the ultrasonic horn. It is preferable to apply ultrasonic vibration by sandwiching the film so as to form a pattern corresponding to the protrusion on the sandwiched film portion. In this way, a pattern can be formed on the film portion around the polygonal line habit.
(5) The polygonal line habit may be formed in a direction parallel to the transport direction of the packaging film.

(6) The film fold line habit-making method according to the present invention is a film fold line habit-making method in which a film portion of a strip-shaped wrapping film supplied to the wrapping machine body is given a fold line habit on the upstream side of the wrapping machine body. In a state where the packaging film is sandwiched between a first member having a protrusion that can contact the film portion and a second member having a concave groove at a position facing the protrusion, at least one of the protrusion and the concave groove is sandwiched. By vibrating, the fold line habit is formed in the film portion where the protrusion contacts. The film portion where both the protrusion and the concave groove vibrate and come into contact may be pressurized by vibration, or the film portion where one vibrates and contacts may be sandwiched between the other and pressurized. It may be the portion of the protrusion or the groove that vibrates, or the entire first member or the second member may vibrate and the protrusion or the groove may vibrate accordingly. Since the habit of breaking is created by pressurization due to vibration, even if the transportation of the packaging film is temporarily stopped with the packaging film sandwiched between the protrusions and the concave groove, the vibration is stopped during the suspension to pinch the film. It is possible to prevent stress and damage to the film portion of the packaging film as much as possible.

(7) The vibration may be ultrasonic vibration. By ultrasonically vibrating, it is possible to create a neat line habit in a short time, and it is good that the magnitude and amplitude value of the vibration can be changed in a short time.

According to the present invention, it is possible to prevent the packaging film from being damaged even if the packaging film is sandwiched between protrusions and grooves and maintained in contact with the packaging film while the transportation of the packaging film is temporarily stopped.

It is a figure which shows an example of the pillow wrapping machine which mounts the folding wire habit-adding apparatus which concerns on this invention. It is a figure which shows one preferable embodiment of the polygonal line habit-adding apparatus which concerns on this invention. It is a figure which shows the packaging film which passed through the bag making device 15 and was made into a tubular shape.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not construed as being limited to this, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

FIG. 1 shows a preferred form of a pillow wrapping machine provided with a film polygonal line habit device according to the present invention. The pillow wrapping machine is arranged on the wrapping machine main body 1, a film supply device 2 that continuously supplies a strip-shaped wrapping film to the wrapping machine main body 1, and the wrapping machine main body 1 on the upstream side. It is provided with a product supply device 4 that supplies the product 3 to 1 at predetermined intervals.

The film supply device 2 links the output of a drive motor (for example, a speed-controllable motor such as a servomotor), which is not shown, to the original roll 6 in which the strip-shaped packaging film 5 is wound into a roll, and the original fabric is used. The roll 6 is supplied to the packaging machine main body 1 at a constant speed while appropriately controlling the rotation speed. Further, various rollers 7 are arranged at predetermined positions from the raw roll 6 to the packaging machine main body 1, and the packaging film 5 sent out from the raw roll 6 is hung on the rollers 7 to carry out a predetermined route. It is guided to the packaging machine main body 1 through. In the present invention, it is not always necessary to link the drive motor to the original roll 6, and a feed roller may be provided on the transport path of the packaging film to pull it out.

The product supply device 4 is composed of sprockets 9 arranged in the front-rear direction, endless chains 10 spanned over the plurality of sprockets 9, and a plurality of push fingers 11 attached to the endless chains 10 at predetermined pitch intervals. Will be done. As a result, when the pushing finger 11 abuts on the rear surface of the product 3, the product 3 also moves forward on the transport path as the pushing finger 11 moves.

The wrapping machine main body 1 includes a bag making device 15 that makes a tubular packaging film 5 to be supplied, a center sealing device 16 arranged on the downstream side of the bag making device 15, and the center sealing device 16. The belt conveyor 17 that conveys the tubular film 14 arranged on the downstream side of the belt conveyor 17, the top sealing device 20 arranged on the downstream side of the belt conveyor 17, and the unloading conveyor 18 arranged on the downstream side of the top sealing device 20. The restraining belt 19 and the like arranged above the belt conveyor 17 and immediately before the top sealing device 20 are provided.

The bag making device 15 is made into a tubular shape along the inner peripheral surface of the bag making device 15 by passing the packaging film 5 continuously supplied from the film supply device 2. Both side edge portions 5a of the bag-made packaging film 5 are brought into contact (polymerization) with each other. The bag making device 15 of the present embodiment is set so that the lower side is open and both side edge portions 5a of the packaging film 5 are located on the lower side.

Further, the product 3 sequentially supplied from the product supply device 4 to the packaging machine main body 1 is inserted into the bag making device 15. As a result, the products 3 supplied to the bag making device 15 are arranged at predetermined intervals in the packaging film 5 which is made into a tubular bag.

The center sealing device 16 is provided with a pair of left and right sealers, and the pair of sealers sandwiches and seals the overlapped portions of both side edge portions 5a of the packaging film 5. For example, a disk-shaped rotating sealer that heats and pressurizes the film from the left and right to seal the film, or a rectangular bar sealer that heats the film from the left and right and is placed on the downstream side of the bar sealer. , There are those that pressurize and seal the heated film part. By passing through the center sealing device 16, both side edge portions of the packaging film 5 made into a tubular shape by the bag making device 15 are sealed to form the tubular film 14.

The top sealing device 20 seals and cuts the tubular film 14 in a direction orthogonal to the traveling direction, that is, in a transverse direction. The film portion to be sealed and cut is a predetermined position between the front and rear products 3. As a result, by passing through the top sealing device 20, the leading portion of the tubular film 14 is separated from the trailing portion, and the packaging body 25 is manufactured.

The film polygonal line habit device 21 of the present embodiment has a portion corresponding to the four corners of the package 25 having a substantially rectangular outer shape, that is, a portion facing the four corners of the inner peripheral surface of the bag making device 15. Each of them has a habit of breaking lines. The four corners of the packaging body 25 having a polygonal line habit are in a direction parallel to the transport direction of the packaging film 5, and are formed before being supplied to the bag making device 15. Therefore, the film polygonal line habit device 21 is arranged at a predetermined position of the film supply device 2.

The film polygonal line habit device 21 of the present embodiment includes four sets of a pair of ultrasonic horn units 31 and anvil units 32 that are arranged so as to face each other with the packaging film 5 interposed therebetween. The arrangement positions of the ultrasonic horn unit 31 and the anvil unit 32 of each pair are set to the film portions corresponding to the four corners of the package 25 having a polygonal line habit. FIG. 2 shows a pair of ultrasonic horn units 31 and anvil units 32 for forming a certain film polygonal line habit. Then, the paired configurations are arranged side by side in the horizontal direction orthogonal to the transport direction of the packaging film 5, or are arranged so as to be appropriately shifted back and forth.

The ultrasonic horn unit 31 is arranged on a disk-shaped ultrasonic horn 35 and an extension line of the rotation center of the ultrasonic horn 35, and is a converter or amplification that generates ultrasonic waves for ultrasonically vibrating the ultrasonic horn 35. A drive source 36 or the like such as a booster is provided. The drive source 36 is supported by bearings (not shown) at a plurality of predetermined positions in the axial direction. By this bearing support, the drive source 36 rotates about the rotation shaft, and the ultrasonic horn 35 rotates integrally with the rotation shaft. The ultrasonic horn 35 vibrates to expand / contract in diameter under the power of the drive source 36. Further, the ultrasonic horn 35 forms a concave groove 35a on its side peripheral surface 35b so as to be continuous in the circumferential direction. In this embodiment, the concave groove 35a is a V-shaped groove having a substantially triangular cross section. Further, the amplitude of the ultrasonic wave may be the same as, for example, the amplitude when sealing the packaging film in the ultrasonic sealing device, but may be a value smaller than the amplitude at the time of sealing.

The anvil unit 32 includes a disk-shaped anvil 38. The anvil 38 is formed with protrusions 38a projecting outward on its side peripheral surface 38c so as to be continuous in the circumferential direction. The protrusion 38a has a substantially triangular cross section, and has an outer shape corresponding to the inner shape of the concave groove 35a provided in the ultrasonic horn 35.

The ultrasonic horn 35 and the anvil 38 are configured to move relatively close to each other and move away from each other, and when they move close to each other, a predetermined position of the packaging film 5 is determined between the protrusion 38a and the concave groove 35a. Hold with the pressure of.

Further, in the present embodiment, a protrusion 38b having a predetermined pattern is formed next to the protrusion 38a on the side peripheral surface 38c of the anvil 38. When the ultrasonic horn 35 and the anvil 38 move close to each other, the packaging film 5 is sandwiched between the protrusion 38b and the side peripheral surface 35b of the ultrasonic horn 35 with a predetermined pressure.

Further, although specific illustration is omitted, for example, the rotation axis 39 of the anvil 38 is translated in a direction orthogonal to the axial direction or is predetermined centered on one end side (non-connecting side with the anvil 38) of the rotation axis 39. It is preferable to configure it so that it can rotate forward and reverse within the angle range. In this way, the side peripheral surface 38c of the anvil 38 is separated from the side peripheral surface 35b of the ultrasonic horn 35 by a predetermined distance or more, and a standby position for forming a predetermined space between the two and the side peripheral surface 38c of the anvil 38 And the operating position where the side peripheral surface 35b of the ultrasonic horn 35 is close to or in contact with each other. By displacing the two positions in this way, for example, the wrapping film 5 is inserted into the space while being positioned at the standby position, and the film portion that gives the wrapping film 5 a crease is formed by the protrusion 38a and the concave groove 35a. It can be easily positioned between. Then, when the packaging film 5 is set to the operating position in such a position, the packaging film 5 is sandwiched between the side peripheral surface 35b of the ultrasonic horn 35 and the side peripheral surface 38c of the anvil 38.

The ultrasonic horn 35 and the anvil 38 of the present embodiment rotate in synchronization with each other so that the packaging film 5 can be smoothly conveyed. That is, on the ultrasonic horn unit 31 side, for example, a gear is connected to one end of the drive source 36 (the side not connected to the ultrasonic horn 35). On the other hand, on the anvil unit 32 side, for example, one end of the rotating shaft 39 of the anvil 38 is connected to one end of the universal joint, and a gear is connected to the other end of the universal joint. Then, it is preferable that both gears are engaged with each other and linked to the drive motor via a power transmission mechanism in which one gear is combined with, for example, a plurality of gears. By providing the universal joint, the rotational force is transmitted to the anvil 38 while allowing the movement (transition between the standby position and the operating position) in the direction intersecting the axial direction of the rotating shaft 39 of the anvil 38. Therefore, when the drive motor is rotationally driven, both gears rotate, and the anvil 38 and the ultrasonic horn 35 rotate in synchronization.

According to the present embodiment, a predetermined portion of the packaging film 5 is sandwiched with an appropriate pressure, and the sandwiched film portion is pressed by ultrasonic vibration of the ultrasonic horn 35 with a desired amplitude. At this time, the film portion of the packaging film 5 that gives a broken line habit is pushed by the protrusion 38a of the anvil 38 and enters the recessed groove 35a of the ultrasonic horn 35, and the film portion is formed by the tip of the protrusion 38a and the recessed groove 35a. Pressurization is performed firmly by ultrasonic vibration at the deepest part. As a result, the packaging film 5 that has passed through the film polygonal line habit device 21 is provided with a polygonal line habit at the portion sandwiched between the protrusion 38a and the concave groove 35a.

Further, since the ultrasonic horn 35 and the anvil 38 rotate at a speed corresponding to the transport speed of the packaging film 5, it is possible to form a polygonal line habit without stress on a predetermined film portion.

Since the film polygonal line habit device 21 of the present embodiment includes four sets of a pair of ultrasonic horns 35 and anvil 38, the polygonal line habit formed after passing through the film polygonal line habit device 21 is parallel to the film transport direction. Four are formed. The four fold lines are formed at positions facing the four corners of the bag making device 15, and the packaging film 5 that has passed through the bag making device 15 and is made into a tubular shape is shown in FIG. As shown in the above, the vertical cross section of the vertical plane orthogonal to the transport direction has a rectangular shape with four corners neatly folded. Therefore, the finally formed package also has a shape in which the four corners are neatly pointed.

Further, in the present embodiment, since the protrusion 38b is provided on the side peripheral surface 38c of the anvil 38, the peripheral edge of the film portion having a polygonal line habit is between the protrusion 38b and the side peripheral surface 35b of the ultrasonic horn 35. It is sandwiched between and pressurized, and receives ultrasonic vibration. As a result, a pattern corresponding to the plane pattern of the protrusion 38b is formed on the film portion in contact with the protrusion 38b.

In the present embodiment, when the packaging machine is temporarily stopped due to, for example, lunch break or other reasons, the anvil 38 is maintained in the operating position, and the ultrasonic horn 35 and the anvil 38 are maintained in a state in which the packaging film 5 is sandwiched. At this time, the drive source 36 is operated and controlled so that the amplitude of the ultrasonic vibration of the ultrasonic horn 35 is set to 0 or is made very small so as not to cause stress damage to the film. In this way, even if the wrapping film 5 is in contact with and sandwiched between the protrusion 38a and the concave groove 35a for a relatively long time, the wrapping film 5 is not damaged and is sandwiched after the operation is restarted. The packaging film 5 in the exposed portion can also be used for manufacturing the packaging body, and film loss is eliminated. Then, as described above, during the temporary stop, the film portion sandwiched between the protrusion 38a and the concave groove 35a is continuously sandwiched immediately before the stop, so that the broken line habit formed on the packaging film 5 before and after the operation is stopped and restarted. Can guarantee continuity.

In the above-described embodiment, the ultrasonic horn 35 is a disk-shaped and rotary type, but the present invention is not limited to this. For example, the ultrasonic horn used for the ultrasonic sealer shown in the actual opening flat 4-115111. It may be configured so as not to rotate. However, it is preferable that the rotary type is used as in the present embodiment because the stress applied to the packaging film can be made smaller.

Further, the protrusion 38b provided on the side peripheral surface 38c of the anvil 38 does not necessarily have to be attached. Furthermore, the shapes of the protrusion 38a and the concave groove 35a may be matched with each other. For example, the angle of the tip of the protrusion 38a is made narrower than the angle of the inner part of the concave groove 35a, and only the vicinity of the tip is formed on the packaging film 5. It may be contacted and pressurized.

Further, in the above-described embodiment, four polygonal line habits are formed so that the four corners of the package have a sharp shape, but the number of lines formed is arbitrary, for example, two lines are formed, for example. The corners on the bottom surface side of the package should be sharpened and the corners on the top surface side should not be sharpened. For example, 6 pieces should be formed and the gusset forming part should be broken like the device of Patent Document 1. It is good to attach it.

Further, in the above-described embodiment, the fold line habit is formed in the direction parallel to the transport direction of the packaging film 5, and is formed in the film portion corresponding to the four corner portions extending in the direction parallel to the center seal portion of the packaging body. However, for example, the packaging film 5 may be formed in a direction orthogonal to the transport direction. In this case, the place where the polygonal line is formed should correspond to the corner portion extending in the direction parallel to the top seal portion of the package. With this configuration, the corners parallel to the top seal are neatly sharpened. When the ultrasonic horn and the anvil are formed in a direction orthogonal to the transport direction in this way, for example, the ultrasonic horn and the anvil are composed of, for example, an elongated bar shape, and are sandwiched from both sides so as to cross the width direction of the packaging film 5. It is good to make contact. Since it is pressurized by ultrasonic vibration to give a broken line habit, it does not cause thermal damage to the film.

When forming a fold line habit in a direction orthogonal to the transport direction of the packaging film in this way, it is preferable to combine it with a fold line habit formed in a direction parallel to the transport direction of the wrapping film as in the above-described embodiment.

Furthermore, in the above-described embodiment, the packaging film is vibrated by using ultrasonic vibration, but vibration may be applied by other than ultrasonic vibration. However, using ultrasonic vibration makes it possible to create a neat line habit in a short time, it is easy to adjust the magnitude of the vibration, and it is also easy to control so that the packaging film is not stressed during pause. It is good because it can be done.

Although various aspects of the present invention have been described above with reference to embodiments and modifications, these embodiments and descriptions have not been made for the purpose of limiting the scope of the present invention, and are intended for understanding the present invention. It should be added that it was provided to contribute. The scope of the present invention is not limited to the configurations and manufacturing methods explicitly described in the specification, but also includes combinations of various aspects of the present invention disclosed in the present specification. Of the present invention, the configuration for which a patent is sought is specified in the appended claims, but even if the configuration is not currently specified in the claims, it is disclosed in the present specification. I would like to mention that there is a possibility of claiming a patent for this configuration in the future.

1: Packaging machine body 2: Film supply device 3: Product 4: Product supply device 5: Packaging film 14: Cylindrical film 15: Bag making machine 16: Center seal device 20: Top seal device 21: Film break line habit device 25 : Package 31: Ultrasonic horn unit 32: Anvil unit 35: Ultrasonic horn 35a: Recessed groove 35b: Side peripheral surface 36: Drive source 38: Anvil 38a: Protrusion 38b: Protrusion 38c: Side peripheral surface

Claims (7)

A wrapping machine main body, a film supply device that continuously supplies a strip-shaped wrapping film to the wrapping machine main body, and a product that is arranged on the upstream side of the wrapping machine main body and supplies products to the wrapping machine main body. A film-breaking wire habit device used in a wrapping machine equipped with a feeding device and arranged on the upstream side of the wrapping machine main body.
It is provided with a pair of anvils and ultrasonic horns arranged across the packaging film.
The anvil has protrusions on the surface in contact with the packaging film.
The ultrasonic horn has a concave groove at a position facing the protrusion.
A film-breaking line habit-imparting device, characterized in that ultrasonic vibration is applied to a film portion of the packaging film sandwiched between the protrusion and the concave groove to form a broken line habit. The anvil has a disk shape that is rotatably arranged.
The film polygonal line habit device according to claim 1, wherein the protrusions project outward on the disk-shaped side peripheral surface and are configured to be continuous in the circumferential direction. The ultrasonic horn has a disk shape that is rotatably arranged.
The film polygonal line habit device according to claim 1 or 2, wherein the concave groove is formed so as to be continuous outward in the circumferential direction on the disk-shaped side peripheral surface. Next to the protrusion of the anvil, a protrusion having a smaller protrusion amount than the protrusion is formed.
The packaging film is sandwiched between the protrusion and the unformed region of the concave groove of the ultrasonic horn, and ultrasonic vibration is applied so as to form a pattern corresponding to the protrusion on the sandwiched film portion. The film fold line habit-adding device according to any one of claims 1 to 3, wherein the film is configured according to the above. The film folding line habit according to any one of claims 1 to 4, wherein the broken line habit is formed in a direction parallel to the transport direction of the packaging film. This is a method of forming a line habit on the upstream side of the wrapping machine body with respect to the film portion of the strip-shaped wrapping film supplied to the wrapping machine body.
In a state where the packaging film is sandwiched between a first member having a protrusion that can contact the film portion and a second member having a concave groove at a position facing the protrusion, at least one of the protrusion and the concave groove is vibrated. A method for forming a broken line habit in a film portion where the protrusions come into contact with the film. The method for forming a broken line of a film according to claim 6, wherein the vibration is ultrasonic vibration.

Images