JP2022095545A - Electrode for high frequency dielectric heating - Google Patents

Abstract

To provide an electrode for high frequency dielectric heating which can reduce the possibility that a surface layer portion of a resin tubular film is peeled off and the opening fails when a sealing portion of the film is cut and opened.SOLUTION: An electrode 20 for high frequency dielectric heating for forming an envelope-attached tubular film 100 by performing high-frequency dielectric heating across a first region P1 and a second region P2 in a state in which the first region P1 and the second region P2 of a laminated film P formed by stacking two vinylidene chloride resin films F are arranged and stacked on the outer side in the radial direction and the inner side in the radial direction, respectively, includes an external electrode 21 arranged radially outside the first region P1, and an internal electrode 22 arranged radially inside the second region P2, and a coating 21A made of an electrical insulator is formed on the external electrode 21.SELECTED DRAWING: Figure 2

Description

The present invention relates to a high frequency dielectric heating electrode.

Currently, various tubular packages made of a resin film for packaging contents such as sausages have been proposed. For example, a cylindrical casing portion and a sealing portion that protrudes radially outward from the casing portion and extends in the longitudinal direction by joining the inner surfaces of both edge portions of the cylindrically rolled film in a palm-to-hand state. (See Patent Document 1), a technique has been proposed in which a cylindrical package is formed by forming a seal portion and welding and joining the seal portion together with the casing portion (see Patent Document 1). Further, in recent years, a technique has been proposed that realizes both easy-opening property and retort resistance by forming a sealing portion formed by joining both edges of a film with a specific material (patent). See Document 2).

Japanese Unexamined Patent Publication No. 1-139356 JP-A-2015-164860

By the way, in the technique described in Patent Document 1 and Patent Document 2, there is a case where so-called high frequency welding is adopted in which a portion to be sealed is sandwiched between electrodes and an electric field is applied to heat and weld the portion. If such high-frequency welding is adopted, when the seal portion is cut and the package is opened, only the surface layer portion (the outermost portion in the radial direction) of the film may be peeled off and the opening may fail. rice field. That is, in the conventional package (cylindrical film), four resin films are stacked by arranging laminated films composed of two resin films on the radial outer side and the radial inner side, respectively, and these four sheets are stacked. Since all of the films in the above are welded to form a seal portion, when the seal portion is cut and the package is opened, the two films on the outer side in the radial direction (the force located on the outermost side in the radial direction). There were many cases in which only the surface layer (the surface layer where it is easy to get rid of) was peeled off and the package failed to open. Therefore, there is a demand for an improved high-frequency welding technique for reducing the possibility of opening failure, and in particular, the development of an electrode for high-frequency dielectric heating has been long-awaited.

The present invention has been made in view of such circumstances, and reduces the possibility that the surface layer portion of the resin is peeled off and the opening fails when the sealing portion of the resin tubular film is cut and opened. It is an object of the present invention to provide an electrode for high frequency dielectric heating.

In order to achieve the above object, the high-frequency dielectric heating electrode according to the present invention has a first region and a second region of a laminated film formed by stacking two vinylidene chloride resin films in the radial outer direction and the radial direction, respectively. It is for forming an envelope-pasted tubular film by performing high-frequency dielectric heating across the first region and the second region in a state of being arranged inside and stacked, and is more than the first region. An external electrode arranged on the outer side in the radial direction and an internal electrode arranged on the inner side in the radial direction from the second region are provided, and a film made of an electric insulator is formed on the external electrode. As the electric insulator, one or more kinds of inorganic electric insulators selected from ceramics, mica, and glass can be adopted.

When such a configuration is adopted, the first region and the second region of the laminated film formed by stacking two vinylidene chloride resin films are arranged and stacked on the radial outer side and the radial inner side, respectively. High-frequency dielectric heating is performed across the first and second regions by means of an external electrode arranged radially outside the region and an internal electrode arranged radially inside the second region to form the first region. By continuously welding to the second region, it is possible to form an envelope-pasted tubular film that can be filled and sealed with various contents (for example, ground meat). At this time, since a film made of an electric insulator is formed on the external electrode, the region where the temperature between the electrodes is highest can be shifted to the external electrode side. Therefore, the two films constituting the first region arranged on the outer side in the radial direction and one film located on the outer side in the radial direction among the two films forming the second region arranged on the inner side in the radial direction. Can be welded to form a sealed portion. That is, since three films can be welded from the outside of the four films to form a sealing portion, when the sealing portion is cut and the package is opened, the first region arranged on the outer side in the radial direction is formed. It is possible to prevent the film located on the outer side in the radial direction from the film located on the inner side in the radial direction among the two constituent films. As a result, the possibility of opening failure can be reduced.

In the high-frequency dielectric heating electrode according to the present invention, the line roughness of the portion of the external electrode in contact with the vinylidene chloride resin film is set to a maximum height of Rz100 (μm) or less and an arithmetic average roughness of Ra10 (μm) or less. can do.

When such a configuration is adopted, the line roughness of the portion of the external electrode in contact with the vinylidene chloride resin film is set to a maximum height of Rz100 (μm) or less and an arithmetic average roughness of Ra10 (μm) or less. The frictional resistance between the electrode and the film can be reduced, and continuous welding can be realized, for example, at a film speed of 30 to 40 m / min. That is, by setting the line roughness of the portion to a maximum height of Rz100 (μm) or less and an arithmetic average roughness of Ra10 (μm) or more, the frictional resistance between the electrode and the film increases and the film pulsates. , Can be prevented from occurring.

In the high-frequency dielectric heating electrode according to the present invention, the linear roughness of the portion of the external electrode in contact with the vinylidene chloride resin film is set to a maximum height of Rz1 (μm) or more and an arithmetic average roughness of Ra0.5 (μm) or more. Can be set to.

When such a configuration is adopted, the line roughness of the portion of the external electrode in contact with the vinylidene chloride resin film is set to a maximum height of Rz1 (μm) or more and an arithmetic average roughness of Ra0.5 (μm) or more. Therefore, the slipperiness with the film can be appropriately exhibited. That is, by setting the line roughness of the portion to a maximum height of Rz1 (μm) or more and an arithmetic average roughness of Ra0.5 (μm) or more, the film becomes too smooth and slipperiness with the film deteriorates, resulting in frictional resistance. It is possible to prevent a situation in which the film becomes large and the film pulsates.

In the high frequency dielectric heating electrode according to the present invention, the thickness of the coating film can be set to 10 μm or more and 150 μm or less.

When such a configuration is adopted, three sheets of the four vinylidene chloride-based resin films can be more reliably welded from the outside to form a sealing portion. That is, by setting the thickness of the film to 10 μm or more, the region where the temperature between the electrodes is the highest can be sufficiently shifted to the external electrode side. It is possible to prevent a situation in which the film and the two films constituting the second region arranged radially inside are welded and the openability cannot be ensured. In addition, by setting the thickness of the film to 150 μm or less, the output for welding does not become too large, and it is possible to prevent the occurrence of sparks due to minute fluctuations in the film. Can be done.

In the high frequency dielectric heating electrode according to the present invention, the thickness of the coating film can be set to 40 μm or more and 90 μm or less.

When such a configuration is adopted, three sheets of the four vinylidene chloride-based resin films can be more reliably welded from the outside to form a sealing portion.

According to the present invention, there is provided a high frequency dielectric heating electrode capable of reducing the possibility that the surface layer portion of the film is peeled off and the opening fails when the sealing portion of the resin tubular film is cut and opened. It becomes possible to do.

It is a block diagram of the automatic filling packaging machine provided with the electrode for high frequency dielectric heating which concerns on embodiment of this invention. It is a block diagram of the electrode for high frequency dielectric heating which concerns on embodiment of this invention. It is sectional drawing of the tubular film formed by the automatic filling packaging machine provided with the electrode for high frequency dielectric heating which concerns on embodiment of this invention. It is a top view of the tubular film formed by the automatic filling and packaging machine provided with the electrode for high frequency dielectric heating which concerns on embodiment of this invention. FIG. 3 is an enlarged cross-sectional view of a sealing portion (V portion in FIG. 3) of a tubular film formed by an automatic filling and packaging machine provided with an electrode for high-frequency dielectric heating according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following embodiments are merely suitable application examples, and the scope of application of the present invention is not limited thereto.

First, the configuration of the automatic filling and packaging machine 1 provided with the high-frequency dielectric heating electrode 20 according to the present embodiment will be described with reference to FIGS. 1 and 2.

The automatic filling and packaging machine 1 has diameters of a first region P ₁ and a second region P ₂ of a laminated film P formed by stacking two vinylidene chloride-based resin films (hereinafter, simply referred to as “films”) F. Envelope-pasted tubular film 100 (see FIG. 3 etc.) is subjected to high-frequency dielectric heating while sandwiching the first region P ₁ and the second region P ₂ in a state of being arranged and overlapped on the outer side in the direction and the inner side in the radial direction. The purpose is to automatically perform each step of forming the formed cylindrical film 100, filling the formed cylindrical film 100 with the content C, sealing and cutting each predetermined length to obtain a package 200 having a predetermined length. Yes, as shown in FIG. 1, it includes a film supply unit 10, a high frequency dielectric heating electrode 20, a content supply unit 30, a sealing unit 40, and a cutting unit 50.

The film supply unit 10 is configured to rotate the laminated film P at a predetermined rotation speed in a wound state, so that the roller 11 unwinds the laminated film P and the laminated film P unwound by the roller 11 is placed at a predetermined position. A laminated film in which the first region P ₁ and the second region P ₂ of the laminated film P guided to a predetermined position are arranged on the radial outer side and the radial inner side, respectively. It has a tubular body forming portion (not shown), etc., in which P is an envelope-pasted tubular body. The rotation speed of the roller 11, the position of the guide member group 12, the configuration of the tubular body forming portion, etc. depend on the type of the laminated film P, the required film supply speed, the position of the high frequency dielectric heating electrode 20, and the like. It can be adjusted as appropriate.

The high-frequency dielectric heating electrode 20 is for turning the laminated film P continuously supplied by the film supply unit 10 at a predetermined speed (for example, 40 m / min) into a tubular film 100, as shown in FIG. The external electrode 21 arranged radially outside the _first region P1 of the laminated film P formed into a tubular body by the tubular body forming portion of the film supply unit 10, and the second region P of the laminated film P. It has an internal electrode 22 which is arranged radially inside more than ₂ .

As shown in FIG. 2, the external electrode 21 is formed with a coating film 21A made of an electrical insulator. Examples of the electric insulator constituting the coating film 21A in the present embodiment include polyamide resin, polyimide resin, polyester resin, polyethylene resin, polypropylene resin, polystyrene resin, fluororesin, and polyurethane as organic ones. Examples thereof include based resins, acrylic resins, polyphenylene ether resins, polyacetal resins, phenol resins, epoxy resins, silicon resins and the like. Examples of the inorganic electric insulator include ceramics, mica, glass and the like. From the viewpoint of heat resistance and wear resistance, inorganic electric insulators are preferable, and among ceramics, alumina, zirconia, and silicon carbide, which have high hardness, are more preferable. It should be noted that a material such as silicon rubber, which has a large frictional resistance, is not preferable as an electric insulator constituting the film 21A because the slipperiness with the film F deteriorates.

The thickness of the coating film 21A provided on the external electrode 21 is set to 10 μm or more and 150 μm or less. The thickness of the coating film 21A is preferably 20 μm or more and 140 μm or less, more preferably 40 μm or more and 130 μm or less, and particularly preferably 40 μm or more and 90 μm or less. As a result, the region A (see FIG. 2) where the temperature is highest between the external electrode 21 and the internal electrode 22 can be shifted to the external electrode 21 side, and three of the four films F from the outside can be twisted. The sealing portion S (see FIGS. 3 to 5) can be formed by reliable welding.

That is, by setting the thickness of the film 21A to 10 μm or more, the region A where the temperature is highest between the external electrode 21 and the internal electrode 22 can be sufficiently shifted to the external electrode 21 side, so that the region A is radially outward. A situation in which the two films F constituting the arranged first region P ₁ and the two films F constituting the arranged second region P ₂ are welded to each other and the openability cannot be ensured. Can be prevented from occurring. Further, by setting the thickness of the film 21A to 150 μm or less, the output for welding does not become too large, and a situation such as sparks occurring due to minute fluctuations in the film F does not occur. Can be prevented. In particular, it is preferable to set the thickness of the coating film 21A to 40 μm or more and 90 μm or less.

The line roughness of the portion of the external electrode 21 in contact with the film F (that is, the surface 21Aa of the coating film 21A) is a maximum height Rz1 (μm) or more and 100 (μm) or less and an arithmetic mean roughness Ra0.5 (μm) or more 10 It is set to (μm) or less. As a result, the frictional resistance between the external electrode 21 and the film F can be reduced, for example, continuous welding can be realized at a film speed of 30 to 40 m / min, and slipperiness with the film F can be realized. Can be appropriately expressed. That is, by setting the line roughness of the portion (the surface 21Aa of the film 21A) to be the maximum height Rz100 (μm) or less and the arithmetic mean roughness Ra10 (μm) or more, the line roughness between the external electrode 21 and the film F is set. It is possible to prevent a situation in which the frictional resistance becomes large and the film F pulsates. Further, by setting the line roughness of the portion (the surface 21Aa of the film 21A) to a maximum height of Rz1 (μm) or more and an arithmetic average roughness of Ra0.5 (μm) or more, the film F becomes too smooth. It is possible to prevent a situation in which the slipperiness of the film is deteriorated, the frictional resistance is increased, and the film F is pulsated.

The content supply unit 30 is for supplying the content (for example, surimi for fish meat) C to the inside of the tubular film 100 formed by the high-frequency dielectric heating electrode 20, and is slightly larger than the diameter of the tubular film 100. A cylindrical body 31 having a small diameter and partially inserted inside the tubular film 100, and a content (not shown) that supplies the content C to the inside of the tubular film 100 via the cylindrical body 31. It has a source and.

The sealing portion 40 is for sealing the tubular film 100 filled with the content C at predetermined lengths (for example, 200 mm). The sealing portion 40 in the present embodiment employs a mechanism for binding and sealing the tubular film 100 at predetermined lengths using a set of two aluminum wires 41. A set of two aluminum wires 41 are attached to the tubular film 100 in a slightly separated state, and a cutter of a cutting portion 50, which will be described later, is formed in a gap formed between the aluminum wires 41. 51 is inserted.

The cutting portion 50 is for cutting a tubular film 100 having a predetermined length filled with the content C and sealed to obtain a package 200 having a predetermined length. The cutting portion 50 in the present embodiment is a cutter 51 configured to cut a portion of the tubular film 100 between two sets of aluminum wires 41 of the sealing portion 40, and an illustration for driving the cutter 51. It has a drive mechanism that is not.

Next, the configuration of the tubular film 100 formed by the automatic filling and packaging machine 1 provided with the high-frequency dielectric heating electrode 20 according to the present embodiment will be described with reference to FIGS. 3 to 5.

As shown in FIG. 3, in the tubular film 100, the first region P ₁ and the second region P ₂ of the laminated film P formed by stacking two films F are arranged on the outer side in the radial direction and the inner side in the radial direction, respectively. It is an envelope-pasted type tubular film having a sealing portion S that is sealed in a stacked state.

In the present embodiment, as shown in FIG. 3 and the like, a predetermined region P ₁ of the laminated film P is slightly separated (only the width W ₁ ) from the end of one edge portion P _E 1 of the laminated film P. A width region is adopted, and as the second region P ₂ of the laminated film P, a region having a predetermined width slightly separated (only the width W ₂ ) from the end of the other edge portion P _E 2 of the laminated film P is adopted. There is. That is, the first region P ₁ is a region near the edge portion that does not include one edge portion P _E 1 of the laminated film P, and the second region P ₂ does not include the other edge portion P _E 2 of the laminated film P. It is an area near the edge.

The size and thickness of the film F are determined according to the size of the content C to be filled. The peripheral length of the film F is usually in the range of 15 to 400 mm, often 30 to 300 mm, and widely adopted is in the range of 40 to 200 mm, and the longitudinal length of the film F is usually 50 to 400 mm, in many cases. In the case of 70 to 300 mm, widely adopted is in the range of 80 to 250 mm. The thickness of the film F is determined in consideration of the strength and barrier properties of the film according to the content C to be filled, but is usually 15 to 300 μm, and in most cases 18 to 200 μm, which is widely adopted. Is in the range of 20 to 150 μm. Even within this range, if the thickness is set to 15 to 25 μm, it is preferable that the film F has an appropriate strength and is easy to cut.

As shown in FIGS. 3 and 5, the sealing portion S is formed by two films F _1A and F _1B constituting the first region P ₁ arranged radially outside the laminated film P, and the laminated film P. Of the two films F _2A and F _2B constituting the second region P ₂ arranged on the inner side in the radial direction, one film F _2A located on the outer side in the radial direction is welded. In the present embodiment, these three films F _1A , F _1B , and F _2A are welded by performing high frequency dielectric heating using the high frequency dielectric heating electrode 20 described above.

In the laminated film P, the region PA having a predetermined width W ₁ from the end of the edge portion P _E near the first region P ₁ arranged on the outer side in the radial direction is a non _- sealing portion (a non-sealing portion) that can be pinched by the user. Outer ear) N. Through holes H arranged at predetermined intervals d in the longitudinal direction are formed in the non-sealed portion N. The unsealed portion N (region _PA ) in which the through hole H is formed is a region serving as a starting point when cutting the sealed portion S, and is easily torn by the user's hand. In this embodiment, an example in which two rows of through holes H are provided is shown, but only one row of through holes H may be provided, or three or more rows of through holes H may be provided.

Subsequently, a method of manufacturing the package 200 using the automatic filling and packaging machine 1 in the present embodiment will be described.

First, the first region P ₁ and the second region P ₂ of the laminated film P are supplied to the high-frequency dielectric heating electrode 20 side at a predetermined speed by the film supply unit 10 of the automatic filling and packaging machine 1. By arranging and stacking them on the outer side in the radial direction and the inner side in the radial direction, respectively, an envelope-pasted tubular body is formed (film supply step). Next, the first region P ₁ and the second region P ₂ overlapped in the film supply step are sandwiched between the external electrode 21 arranged radially outside and the internal electrode 22 arranged radially inside, and high-frequency dielectric heating is performed. To form a tubular film 100 having a sealing portion S (cylindrical film forming step).

In the tubular film forming step, since the external electrode 21 on which the coating film 21A having a predetermined thickness is formed is arranged outside the _first region P1 of the laminated film P, high-frequency dielectric heating is performed as shown in FIG. The position of the region A most heated by (the darkest part in FIG. 2) can be shifted outward in the radial direction. As a result, as shown in FIG. 3, two films F _1A and F _1B constituting the first region P ₁ arranged on the outer side in the radial direction of the laminated film P and the second region P arranged on the inner side in the radial direction P. Of the _two films F _2A and F _2B constituting 2, one film F _2A located on the outer side in the radial direction can be welded to form the sealing portion S.

After that, the content supply unit 30 supplies and fills the content (for example, surimi for fish meat) C inside the tubular film 100 (content filling step), and fills the tubular film 100 with the content C. The sealing portion 40 seals the film every predetermined length (for example, 200 mm) (sealing step), and the tubular film 100 having the content C filled therein and sealed is cut by the cutting portion 50 (cutting step). The package 200 obtained by the above process group will be commercialized after undergoing, for example, a retort treatment at 120 ° C. for about 20 minutes.

When opening the package 200, the user first picks up the unsealed portion (outer ear portion) N of the package 200 with a finger, and in a direction (width direction) substantially orthogonal to the longitudinal direction of the package 200. By tearing along the line, a force that cuts the seal portion S is applied. When such a force is applied, the seal portion S is cut along the width direction. At this time, of the two films F _1A and F _{1 B} constituting the first region P ₁ , the radial direction is used. The film F _1A located on the outer side does not peel off from the film F _{1 B} located on the inner side in the radial direction, and the first region P ₁ can be separated from the second region P ₂ to reliably release the sealed state. After that, the user opens the package 200 by cutting the laminated film P along the width direction of the package 200 or cutting the seal portion S along the longitudinal direction of the package 200. Can be done.

In the high-frequency dielectric heating electrode 20 according to the above-described embodiment, the first region P ₁ and the second region P ₂ of the laminated film P formed by stacking two vinylidene chloride resin films F are radially outside. The external electrode 21 arranged radially outside the first region P ₁ and the internal electrode 22 arranged radially inside the second region P ₂ in a state of being arranged and overlapped radially inside. By performing high-frequency dielectric heating across the first region P ₁ and the second region P ₂ to continuously weld the first region P ₁ and the second region P ₂ , various contents C (for example, shavings, etc.) ) Can be filled and sealed, and an envelope-pasted tubular film 100 can be manufactured. At this time, since the coating film 21A made of an electric insulator is formed on the external electrode 21, the region A where the temperature between the electrodes is the highest can be shifted to the external electrode 21 side. Therefore, it is located on the outer side in the radial direction of the two films F constituting the first region P ₁ arranged on the outer side in the radial direction and the two films F forming the second region P ₂ arranged on the inner side in the radial direction. A single film F and a single film F can be welded to form a sealing portion S. That is, since three films F can be welded from the outside of the four films F to form the seal portion S, the seal portion S is arranged on the outer side in the radial direction when the seal portion S is cut and the package 100 is opened. Of the two films F constituting the first region P ₁ , the film F located on the outer side in the radial direction can be prevented from peeling off from the film F located on the inner side in the radial direction. As a result, the possibility of opening failure can be reduced.

Further, in the high-frequency dielectric heating electrode 20 according to the above-described embodiment, the linear roughness of the portion of the external electrode 21 in contact with the film F (the surface 21Aa of the coating film 21A) is 100 at a maximum height of Rz1 (μm) or more. Since it is set to (μm) or less and the arithmetic average roughness Ra of 0.5 (μm) or more and 10 (μm) or less, the space between the external electrode 21 and the film F is appropriately exhibited while the slipperiness with the film F is appropriately exhibited. The frictional resistance of the film can be reduced, and continuous welding can be realized at a film speed of 30 to 40 m / min, for example.

Further, in the high-frequency dielectric heating electrode 20 according to the above-described embodiment, since the thickness of the coating film 21A is set to 10 μm or more and 150 μm or less, three of the four films are more reliably welded from the outside. The seal portion S can be formed.

Next, each embodiment of the present invention will be described.

[Example 1]
A polyvinylidene chloride-vinyl chloride copolymer (vinylidene chloride content / vinyl chloride content = 89% by mass / 11% by mass, weight average molecular weight 125000) is melted and extruded from a cyclic die to produce a cyclic film, and a stretching temperature of 30 ° C. , 3.0 times in the longitudinal direction and 4.0 times in the width direction, and the insides of the annular films are overlapped by biaxial stretching, and the thickness is 43 μm (thickness of two films with a thickness of 21.5 μm). The original film of the above film was obtained, and the film was unwound and cut to a width of 86 mm to obtain a strip-shaped laminated film.

The laminated film obtained by the above step is set in an automatic filling and packaging machine (manufactured by Asahi Kasei Co., Ltd .: trade name "ADP (registered trademark)") having the same configuration as that described in the present embodiment, and is fed in the longitudinal direction. While the extending both side edges were overlapped and wound into an envelope-pasted tubular shape and run downstream, the overlapped both side edges were sealed at high frequency using a high-frequency dielectric heating electrode to form a tubular film. In this embodiment, a high-frequency dielectric heating electrode having an external electrode having a zirconia film having a maximum surface line roughness of Rz 40.0 μm, an arithmetic mean roughness Ra of 5.0 μm, and a thickness of 50 μm was adopted.

[Example 2]
A high-frequency dielectric heating electrode equipped with an external electrode having a zirconia film having a maximum height of Rz of 80.0 μm, an arithmetic mean roughness of Ra 7.0 μm, and a thickness of 80 μm on the surface is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Example 3]
A high-frequency dielectric heating electrode equipped with an external electrode having a zirconia film having a maximum height of Rz 4.0 μm, an arithmetic mean roughness Ra of 0.7 μm, and a thickness of 20 μm on the surface is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Example 4]
A high-frequency dielectric heating electrode equipped with an external electrode having a zirconia film having a maximum height of Rz of 41.5 μm, an arithmetic mean roughness of Ra 4.8 μm, and a thickness of 118 μm on the surface is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Example 5]
A high-frequency dielectric heating electrode equipped with an external electrode having a zirconia film having a maximum height of Rz39.2 μm, an arithmetic mean roughness of Ra4.7 μm, and a thickness of 23 μm on the surface is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Example 6]
An electrode for high-frequency dielectric heating equipped with an external electrode having an alumina coating having a maximum height of Rz of 41.2 μm, an arithmetic mean roughness of Ra 4.4 μm, and a thickness of 49 μm on the surface is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Example 7]
An electrode for high-frequency dielectric heating having an external electrode having a zirconia film having a maximum height of Rz 2.5 μm, an arithmetic mean roughness Ra of 0.3 μm, and a thickness of 52 μm on the surface was adopted, and the others were the same as in Example 1. Similarly, a tubular film was formed.

[Example 8]
An electrode for high-frequency dielectric heating equipped with an external electrode having a zirconia film having a maximum height of Rz of 0.3 μm, an arithmetic mean roughness of Ra of 0.2 μm, and a thickness of 51 μm on the surface is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Example 9]
An electrode for high-frequency dielectric heating having an external electrode having a polyester film having a maximum height of Rz of 0.5 μm, an arithmetic mean roughness of Ra of 0.4 μm, and a thickness of 50 μm on the surface was adopted, and the others were the same as in Example 1. Similarly, a tubular film was formed.

[Example 10]
An electrode for high-frequency dielectric heating equipped with an external electrode having a polyethylene film having a maximum height of Rz of 0.5 μm, an arithmetic mean roughness of Ra of 0.4 μm, and a thickness of 60 μm on the surface is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Comparative Example 1]
A high-frequency dielectric heating electrode equipped with an external electrode having a zirconia film having a maximum height of Rz of 120.0 μm, an arithmetic mean roughness of Ra of 11.0 μm, and a thickness of 50 μm is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Comparative Example 2]
A high-frequency dielectric heating electrode equipped with an external electrode having a zirconia film having a maximum height of Rz 40.0 μm, an arithmetic mean roughness Ra of 5.0 μm, and a thickness of 170 μm on the surface is adopted, and the others are the same as in Example 1. Similarly, a tubular film was formed.

[Comparative Example 3]
An electrode for high-frequency dielectric heating equipped with an external electrode having a zirconia film having a maximum height of Rz of 0.5 μm, an arithmetic mean roughness of Ra of 0.4 μm, and a thickness of 5 μm on the surface was adopted, and the others were the same as in Example 1. Similarly, a tubular film was formed.

[Comparative Example 4]
A high-frequency dielectric heating electrode equipped with an external electrode having a zirconia film having a maximum height of 39.5 μm on the surface, an arithmetic average roughness of Ra 4.8 μm, and a thickness of 8 μm was adopted, and the others were the same as in Example 1. Similarly, a tubular film was formed.

[Reference example]
An electrode for high-frequency dielectric heating having an external electrode having a silicon rubber coating having a maximum height of Rz of 0.9 μm, an arithmetic mean roughness of Ra of 0.3 μm, and a thickness of 10 μm on the surface is adopted, and the others are Example 1. A tubular film was formed in the same manner as in the above.

[Line roughness]
In each of the above Examples and Comparative Examples, a shape analysis laser microscope (manufactured by KEYENCE: trade name "LASER MICROSCOPE VK-X1000") is used, and the maximum height Rz (μm) of the portion where the external electrode contacts the film is used. And the arithmetic average roughness Ra (μm) was measured and used as the line roughness.
<Measurement preparation>
The "observation application" was started and installed on the rotating stage of the shape analysis laser microscope so that the side of the external electrode in contact with the film was facing up and the vertical direction of the monitor represented the length direction of the external electrode.
<Measurement method setting>
After setting the magnification of the objective lens to 5 times and focusing on the surface of the external electrode, the image was switched from the camera image to the laser image on the operation panel.
<Creation of 3D image>
I set the scan mode to "Laser Confocal" from "Basic measurement" on the toolbar and adjusted the brightness. The upper and lower limits of the surface of the external electrode to be measured were set, and the measurement was started. After the measurement was completed, the obtained 3D image was saved. The "laser confocal" is a scanning method in which the light emitted from the laser is reflected on the surface of the sample, and the confocal position (height information) is detected from the intensity of the reflected light to measure the shape.
<Measurement of line roughness>
Start the "Multi-File Analysis Application", select "Line Roughness" from the toolbar, select vertical lines from the Profile Tool, set to measure areas with high height levels in the 3D display image, and set the maximum height. Rz (μm) and arithmetic mean roughness Ra (μm) were obtained.

[Thickness]
In each of the above Examples and Comparative Examples, both the dimensions of the external electrode before coating the electrical insulator and the dimensions of the external electrode after coating the electrical insulator are measured with a microgauge. The film thickness was measured. At this time, an electric insulator is coated on one side of an external electrode having a substantially rectangular cuboid shape having a width of 40 mm, a length of 40 mm, and a thickness of 2 mm, and a position 20 mm from the end of the coated side (that is, near the substantially center of the side). Position) was measured.

[Packaging aptitude evaluation]
By filling the inside of the tubular film obtained in Examples and Comparative Examples with surimi for fish meat and clipping both ends with aluminum steel wire, the outer ear portion (non-sealed portion) having a length of 200 mm and a width of 7 mm between the clips. A package having the above was produced at a rate of 200 pieces / minute. The filling operation was performed using a vinylidene chloride-based resin film 1500 m, the number of times sparks were generated during the filling operation was counted, and the packaging suitability was evaluated according to the following evaluation criteria.
(Evaluation criteria)
◯: The number of times sparks occurred in the manufacturing process was 0 times ×: The number of times sparks occurred in the manufacturing process was 1 or more

[Retort resistance evaluation]
Using a high-temperature high-pressure cooking sterilizer (manufactured by Hisaka Works: trade name "RCS-40TGN"), the gauge pressure inside the heating can is 0.20 MPa for 1000 packages obtained during the above packaging suitability evaluation. A sealed package was obtained by performing a retort treatment at 120 ° C. for 20 minutes under the above conditions. Among the sealed packages after the retort treatment, the number of broken bags was counted, and the retort resistance was evaluated according to the following evaluation criteria.
(Evaluation criteria)
○: The number of broken bags is 0 ×: The number of broken bags is 1 or more

[Easy to open evaluation]
Among the sealed packages after the retort treatment, 100 samples were randomly sampled in which no bag breakage occurred. The obtained sample was evaluated by a sensory test as to how much force it could be opened by pinching the outer ear part (non-sealed part) and opening it manually. Specifically, 10 panelists each opened 10 sealed package samples, and each sealed package had a sensory test score of 0 to 2 points (2 points: anyone can easily open 1). Point: Anyone can open it with force, 0 point: Cannot open with bare hands). The second decimal place of the average value of a total of 100 sensory test scores was rounded off to obtain an evaluation score, and based on the obtained evaluation score, the ease of opening was evaluated according to the following criteria.
(Evaluation criteria)
⊚: The average sensory test score is 2.0
◯: The average value of the sensory test points is 1.5 or more and less than 2. Δ: The average value of the sensory test points is 1 or more and less than 1.5 ×: The average value of the sensory test points is less than 1.

[Abrasion resistance evaluation]
After using two rolls of a vinylidene chloride resin film 1500 m in the same manner as in the packaging suitability evaluation, the wear resistance of the electrode was visually evaluated according to the following criteria.
(Evaluation criteria)
〇: No abnormality in the electrode coating condition ×: Holes or wear are seen in the electrode coating

The results of each performance evaluation are shown in Table 1 (Example) and Table 2 (Comparative Example) below.

As is clear from Table 1, the linear roughness of the surface of the coating film of the external electrode is the maximum height Rz of 1 μm or more and 100 μm or less, the arithmetic mean roughness Ra is 0.5 μm or more and 10 μm or less, and the thickness of the coating film of the external electrode is In each of the examples (Examples 1 to 7) having a size of 10 μm or more and 150 μm or less, all the performances were evaluated as “Δ” or higher. Further, in each example (Examples 8 to 10) in which the linear roughness of the surface of the coating film of the external electrode is less than the maximum height Rz of 1 μm and the arithmetic mean roughness Ra is 0.5 μm or less, “Δ” is obtained for all the performances. The above evaluation was obtained. In all Examples 1 to 10, the linear roughness of the surface of the coating film of the external electrode is 100 μm or less at the maximum height and the arithmetic average roughness Ra is 10 μm or less, and the thickness of the coating film of the external electrode is 10 μm or more and 150 μm or less. be. On the other hand, in Comparative Example 1 in which the linear roughness of the surface of the coating film exceeds the maximum height Rz of 100 μm and the arithmetic average roughness Ra exceeds 10 μm, the packaging suitability and retort resistance are evaluated as “x”, and the film thickness is 150 μm. In Comparative Example 2 exceeding, the packaging suitability, the retort suitability, and the easy-opening property were evaluated as “x”, and the linear roughness of the surface of the coating film was less than the maximum height Rz 1 μm and the arithmetic mean roughness Ra less than 0.5 μm. In No. 3, the easy-opening property was evaluated as “x”, and even in Comparative Example 4 in which the film thickness was less than 10 μm, the easy-opening property was evaluated as “x”. In the reference example in which the coating material is silicon rubber and the linear roughness of the surface of the coating is less than the maximum height Rz of 1 μm and the arithmetic average roughness Ra is less than 0.5 μm, it is evaluated as “unpackable” in the packaging appropriateness evaluation. It was decided.

The present invention is not limited to the above embodiments, and those having a design modification appropriately by those skilled in the art are also included in the scope of the present invention as long as they have the features of the present invention. .. That is, each element included in the embodiment and its arrangement, material, condition, shape, size, etc. are not limited to those exemplified, and can be appropriately changed. Further, the elements included in the embodiment can be combined as much as technically possible, and the combination thereof is also included in the scope of the present invention as long as the features of the present invention are included.

20 ... Electrode for high frequency dielectric heating 21 ... External electrode 21A ... Coating 21Aa ... Surface of coating (part in contact with film)
22 ... Internal electrode 100 ... Cylindrical film S ... Sealing part F ... Vinylidene chloride resin film P ... Laminated film P ₁ ... First region P ₂ ... Second region

Claims (6)

The first region and the second region are in a state where the first region and the second region of the laminated film formed by stacking two vinylidene chloride-based resin films are arranged and stacked on the radial outer side and the radial inner side, respectively. A high-frequency dielectric heating electrode for forming an envelope-pasted tubular film by performing high-frequency dielectric heating across a region.
An external electrode arranged radially outside the first region,
With an internal electrode located radially inside the second region,
A film made of an electric insulator is formed on the external electrode.
The linear roughness of the portion of the external electrode in contact with the vinylidene chloride resin film is set to a maximum height of Rz100 (μm) or less and an arithmetic average roughness of Ra10 (μm) or less.
A high-frequency dielectric heating electrode having a coating thickness of 10 μm or more and 150 μm or less. The line roughness of the portion of the external electrode in contact with the vinylidene chloride resin film is set to a maximum height of Rz1 (μm) or more and an arithmetic average roughness of Ra0.5 (μm) or more, claim 1. High frequency dielectric heating electrode according to. The high-frequency dielectric heating electrode according to claim 1 or 2, wherein the thickness of the coating film is set to 40 μm or more and 130 μm or less. The high-frequency dielectric heating electrode according to claim 3, wherein the thickness of the coating film is set to 40 μm or more and 90 μm or less. The high-frequency dielectric heating electrode according to any one of claims 1 to 4, wherein the electric insulator is one or more kinds of inorganic electric insulators selected from ceramics, mica, and glass. The high-frequency dielectric heating electrode according to any one of claims 1 to 4, wherein the electric insulator is one or more inorganic electric insulators selected from ceramics alumina, zirconia, and silicon carbide.

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