JP5335365B2 - Rice cooked food packaging material and ultrasonic sealing method - Google Patents

Description

  The present invention relates to a packaging material for cooked rice food for packaging cooked rice food, and a method for ultrasonic sealing used in the production of packaging material for cooked rice food, packaging material for packaging foods such as sandwiches and bread, etc. About.

  Conventionally, as a cooked food packaging material for packaging cooked rice foods such as rice balls, it has an inner film configured to be separable in the width direction and an outer film superimposed on the inner film via a sheet-like food. There is provided a product in which an inner film and an outer film are welded to each other so as to form a welded portion extending in the length direction perpendicular to the width direction on both sides of the sheet-like food.

  A strip-shaped cut tape is attached to the outer film so as to extend in the length direction, and the outer film can be cut in the length direction and divided in the width direction by pulling the cut tape. Yes. On the other hand, the inner film has two films arranged side by side so that they can be separated in the width direction, and a cutting auxiliary line such as a perforation in the length direction of one film. A film which is provided and can be separated in the width direction by cutting the film with a cutting auxiliary line is employed.

  The packaging material for cooked rice processed food having the above-described structure is such that the cooked rice cooked food is placed on the inner film and then folded in half, and the opposite ends are sealed to wrap the cooked rice cooked food. Yes. The packaged food for cooked rice food is interposed between the cooked rice processed food and the sheet food by pulling both sides in the width direction after dividing the outer film in the width direction with a cut tape (divided into two). The inner film is pulled out, and the cooked rice processed food and the sheet-shaped food are integrated.

  By the way, since the cut tape is formed in a narrow band shape, the packaged food for cooked rice food having the above-described configuration has an overlap between the outer film and the sheet-like food remaining even when the outer film is cut with the cut tape. Largely, when the outer film and the inner film are pulled in the width direction, the sheet-like food may be broken due to resistance caused by the overlap between the outer film and the sheet-like food.

  Then, in order to solve the above problems, there are provided two cut tapes attached to the outer film with a gap in the width direction. Such a packaged food for cooked rice food can be removed by cutting the outer film with two cut tapes, thereby removing the outer film between the cut tapes. As a result, the packaged food for processed cooked rice reduces the overlap between the outer film remaining at the time of opening and the sheet-like food, so that the resistance when pulled in the width direction is small, and the occurrence of tearing of the sheet-like food is suppressed. It is supposed to be possible.

  However, even in the packaged food for cooked rice processed food as described above, the outer film and the sheet-like food are overlapped at the time of opening, and when pulled in the width direction, the sheet-like food is resisted by the overlap between the outer film and the sheet-like food. Food may be broken.

  Specifically, it is desirable that the outer film can be cut in the vicinity of the welded part or on the welded part so that the outer film can be cut to the maximum extent, but the film is cut when the cut tape is stuck on the welded part. Therefore, in the packaged food for cooked rice food having the above-described configuration, a cut tape is stuck at a position where the welded portion is covered.

  Therefore, the packaging material for cooked rice processed food having the above-described structure necessarily leaves the outer film extending from the welded portion even if the outer film is cut off with two cut tapes. Will be in a state of overlapping.

  Therefore, the conventional packaged food for cooked rice food can reduce the overlap between the sheet-like food and the outer film at the time of opening, but it cannot eliminate the overlap between the outer film and the sheet-like food, so when pulling in the width direction The sheet-like food may be broken due to the resistance caused by the overlap between the outer film and the sheet-like food.

  Therefore, the present invention can cut the film on the welded portion where the overlapped films are welded, and eliminates the overlap between the film and the sheet-like food at the time of opening to prevent the sheet-like food from being broken to the maximum extent. It is an object of the present invention to provide a packaging material for processed cooked rice.

  Moreover, this invention makes it a subject to provide the ultrasonic sealing method which can cut | disconnect a film on the welding part which welded the overlapped films.

The packaged food for cooked rice food according to the present invention includes an inner film configured to be separable in the width direction, and an outer film superimposed on the inner film via the sheet-like food, and has a width on both sides of the sheet-like food. In the cooked rice processed food packaging material in which the inner film and the outer film are welded to each other so as to form a welded portion extending in the length direction orthogonal to the direction, the welded portion is linearly extending in the length direction. The outer film is a linear thin-walled portion that is thinner than the periphery , and a thin-walled portion that imparts cutting properties only to the outer film is formed on the welded portion. .

  According to the packaging material for cooked rice processed food having the above-described structure, the welded portion in which the inner film and the outer film are welded is formed in a linear shape extending in the length direction orthogonal to the width direction, so the inner film and the outer film Are connected to both sides of the sheet-like food, and both films wrap around the sheet-like food. As a result, the cooked rice packaged food packaging material having the above-described configuration is obtained by placing the cooked rice cooked food on the inner film and then folding the cooked rice cooked food packaging material in half in the length direction to connect the opposing parts. By (welding or the like), the cooked rice processed food and the sheet-like food can be packaged in a state separated by the inner film.

  And, since the outer thin film is formed on the linear welded portion with a linear thin portion thinner than the periphery, the outer film is compared with the periphery by pulling the end of the outer film. It will be torn at the thinned part that becomes weak. That is, by forming the welded portion in a linear shape, the connection strength between the outer film and the inner film can be reduced to the minimum necessary, and the peelability of the outer film can be imparted. By forming the thin-walled portion, it is possible to impart cutting properties to the outer film, so that the outer film can be cut on the welded portion by pulling the outer film.

  As described above, as a result of the outer film being cut on the welded portions (thin wall portions) on both sides of the sheet-like food, the sheet-like food can be kept from overlapping. Therefore, the packaged food for cooked rice food having the above-described structure prevents the sheet-shaped food from being broken without pulling the sheet-shaped food due to overlapping with the outer film when pulled in the width direction. Can do.

  The inner film and the outer film are formed in a rectangular shape having a length in the longitudinal direction, and at least the outer film is cut at the corners of the four corners so as to form an edge extending in a direction inclined with respect to the thin-walled portion. It is preferable that In this way, the pulling force when pulling the edge of the outer film at the time of opening acts intensively at the intersection of the inclined edge and the welded part (thin part), and the intersection (thin part) is The outer film is cut from the starting point. Thereby, the cutting | disconnection (opening) of an outer film can be performed easily and smoothly.

In the ultrasonic sealing method according to the present invention, a film that becomes an inner film and a film that becomes an outer film of the packaging material for cooked rice processed food having the above-described configuration are overlapped , and each film is sandwiched between a horn and a receiving material. An ultrasonic sealing method in which superposed films are welded together by applying ultrasonic waves of a predetermined frequency, wherein the horn has a flat tip formed in contact with the film to be an inner film, while the receiver The material is formed so that the width of at least one direction becomes narrower toward the tip so that the contact area with the film that becomes the outer film at the tip becomes smaller than the tip of the horn. sandwiched between the tip of the timber by applying ultrasonic predetermined frequency from said horn to form a linear welding portion extending the lengthwise, A film comprising the outer film on the welded portion, a linear thin portion becomes thinner than the peripheral, and forming a thin portion that imparts cut resistance only to the film to be the outside of the film .

  According to the ultrasonic sealing method of the above configuration, the superposed film is sandwiched between the horn and the receiving material, and ultrasonic waves with a predetermined frequency are applied from the horn, so that the vibration energy from the horn becomes heat. Can be welded together. The front end of the horn that contacts the film is formed in a flat shape, while the receiving material has a width at least in one direction at the front end so that the contact area of the front end with the film is smaller than the front end of the horn. Since the film that is in contact with the end of the receiving material is welded to the overlapped counterpart film, the contacted part of the receiving material (front end) is on both sides of the receiving material. It will be pushed away and will be raised on both sides of the receiving material.

  Thereby, the film | membrane by the side of a receiving material becomes thin at the site | part corresponding to the front-end | tip of a receiving material, and the both sides become thick. That is, a thin part thinner than the periphery is formed in a linear shape on a linear welded part where the superposed films are welded together.

  In this way, the welded portion is formed in a linear shape, so that the peelability of the laminated film can be imparted with the necessary connection strength between the films being minimized, and the linear shape on the welded portion. By forming the thin-walled portion, it is possible to impart a cutting property to the film. Therefore, by pulling one of the stacked films, the film can be cut on the welded portion.

  Then, it is preferable to apply the ultrasonic wave from the horn while relatively moving the overlapped film, the horn sandwiching the film, and the receiving material in a direction perpendicular to the one direction along the surface of the film. If it does in this way, a welding part and a thin part can be formed in the linear form extended in the relative movement direction of a film, a horn, and a receiving material. Therefore, the films can be linearly welded regardless of the size of the horn or the receiving material, and a linear thin portion can be continuously formed in the welded portion.

  According to the packaging material for cooked rice processed food according to the present invention, one film can be cut on the welded portion where the overlapped films are welded together, and the sheet and the sheet-like food are not overlapped when opened. It is possible to achieve an excellent effect that the breaking of the food can be prevented to the maximum.

  In addition, according to the ultrasonic sealing method of the present invention, it is possible to achieve an excellent effect that the film can be cut on the welded portion where the overlapped films are sealed.

  Hereinafter, a packaged food for cooked rice and an ultrasonic sealing method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the packaged food for cooked rice food according to the present embodiment is overlaid on the inner film 10 via the inner film 10 configured to be separable in the width direction and the sheet-like food S. The inner film 10 and the outer film 20 are welded to each other so as to form a welded portion 30 that includes the outer film 20 and extends in the length direction perpendicular to the width direction on both sides of the sheet-like food S. In each figure, the two-dot chain line indicates the welded portion 30. Moreover, the inner film 10 and the outer film 20 are welded so as to be partially peelable on both sides of the sheet-like food S in the length direction. That is, the inner film 10 and the outer film 20 are welded so that a part of each other can be peeled off at both ends in the length direction. Thereby, as for the packaging material 1 for cooked rice processed food which concerns on this embodiment, the point seal | sticker part P for preventing that the sheet-like food S moves (position shift | offset | difference) to a length direction has a space | interval in the length direction. Open and formed. In the present embodiment, the four point seal portions P are formed so as to regulate the vicinity of the four corners of the sheet-like food S having a quadrilateral shape in plan view.

  The inner film 10 is formed in a rectangular shape having a length in the length direction. The inner film 10 according to the present embodiment is composed of two films 10a and 10b arranged in parallel in the width direction. That is, the inner film 10 is formed by arranging a pair of films 10a and 10b formed in a rectangular shape side by side. The pair of films 10a and 10b are arranged so that one ends in the short direction perpendicular to the longitudinal direction are overlapped.

  The inner film 10 (a pair of films 10a and 10b) is composed of an OP (biaxially stretched polypropylene) film having a mat treatment on at least one surface. In this embodiment, mat processing is performed on both surfaces, and the contact resistance to the sheet-like food S and cooked rice food is reduced.

  The outer film 20 is composed of a single film, and the size and shape are set to be equal to the inner film 10. The outer film 20 is composed of an OP (biaxially stretched polypropylene) film.

  And as for the inner film 10 and the outer film 20 which concern on this embodiment, the corner | angular part of four corners is excised. That is, the four corner portions of the inner film 10 and the outer film 20 are cut so that an edge that extends in the width direction and an edge that is inclined with respect to the edge that extends in the length direction are formed. Thereby, the inner film 10 and the outer film 20 are formed with a rectangular region 1a and a pair of trapezoidal regions 1b and 1b connected to both ends in the longitudinal direction of the rectangular region 1a. .

  And the inner film 10 and the outer film 20 are mutually welded on the both sides of the sheet-like food S in the state piled up via the sheet-like food S, such as laver. In the packaging material 1 for cooked rice food according to the present embodiment, the welded portion 30 is formed in a linear shape extending in the length direction. Then, on the assumption that the welded portion 30 is formed in a linear shape, a thin-walled portion 40 that extends linearly on the welded portion 30 is formed on the outer film 20 as shown in FIG. The thin portion 40 is formed when the outer film 20 and the inner film 10 are welded, and is formed thinner than the peripheral thickness. Specifically, in the outer film 20, both sides of the thin portion 40 are raised along the thin portion 40, and the thin portion 40 is thinner than the thickness of the outer film 20 before welding, and the surrounding raised portions Is thicker than the thickness of the outer film 20 before welding.

  The cooked rice processed food packaging material 1 according to the present embodiment has the above-described configuration, and a method for producing the cooked rice processed food packaging material 1 having the above-described configuration will be described. As shown in FIG. While supplying a certain long film 20 ′ in the longitudinal direction, a rectangular sheet-like food S is sequentially supplied on the long film 20 ′ at intervals in the longitudinal direction. And with respect to long film 20 'with which the sheet-like food S was supplied, long film 10' which is a continuous body of the inner film 10 (a pair of long film 10a 'which is a continuous body of a pair of films 10a and 10b) , 10b ′ in a parallel state) and are supplied in the longitudinal direction while being sequentially stacked. In this state, a sheet-like food is formed between the long film 20 ′ that is a continuous body of the outer film 20 and the long film 10 ′ that is a continuous body of the inner film 10 (a pair of long films 10a ′ and 10b ′). S is placed. Although not shown in FIG. 4, the stacked long films 10 ′ and 20 ′ are spaced apart in the length direction in a state where the sheet-like food S is disposed between the long films 10 ′ and 20 ′. The point seal portions P are formed on both sides of the sheet-like food S by being partially weakly sealed. In addition, as long as the partial welding (peelable point seal | sticker) of long film 10 ', 20' is the state in which the sheet-like food S intervened between long film 10 ', 20', it will be at any timing. However, in the present embodiment, the sheet-like food S is formed on the long films 10 ′ and 20 ′ so that the sheet-like food S does not shift during the manufacturing process of the packaged food 1 for cooked rice food. It is done when it is pinched.

  Then, the long films 10 ′ and 20 ′ overlapped on both sides of the sheet-like food S are welded linearly. In order to weld the long films 10 ′ and 20 ′, laser welding or welding with a heat seal bar may be used, but in the present embodiment, the long films 10 ′ and 20 ′ are bonded together by ultrasonic sealing. We are trying to weld.

  As shown in FIG. 5, the ultrasonic seal sandwiches two overlapped films (long films) 10 ′ and 20 ′ between a horn 50 and a receiving member 51, and applies ultrasonic waves of a predetermined frequency from the horn 50. In this way, the overlapped films 10 'and 20' are welded together. In the present embodiment, the horn 50 has a flat tip that contacts the film 10 ′, while the receiving material 51 has a tip that contacts the film 20 ′ that contacts the film 20 ′ rather than the tip of the horn 50. In order to reduce the area, the width of at least one direction is narrower (tapered) toward the tip, and the overlapped films 10 ′ and 20 ′ are formed at the tip of the horn 50 and the tip of the receiving member 51. The ultrasonic waves having a predetermined frequency are applied from the horn 50 by being sandwiched.

  In the present embodiment, the superimposed films 10 ′ and 20 ′ and the horn 50 and the receiving member 51 sandwiching the films 10 ′ and 20 ′ are arranged in the one direction along the surfaces of the films 10 ′ and 20 ′. The ultrasonic waves are applied from the horn 50 to the films 10 ′ and 20 ′ while being relatively moved in a direction perpendicular to the horn 50. Accordingly, the horn 50 and the receiving member 51 according to the present embodiment are set to a size in which the tip is partially in contact with the films 10 ′ and 20 ′.

  Here, the receiving member 51 may be a fixed type or a rotary type (so-called ring) or the like, and in the present embodiment, a ring type is adopted. That is, the receiving member 51 according to the present embodiment is provided to be rotatable around an axis (not shown) extending in a direction orthogonal to the supply direction of the long film 20 ′, and the width in the direction (one direction) in which the axis extends. Is formed narrower (to taper) toward the outer peripheral end (tip). As a result, the receiving member 51 is arranged so that the leading end sharpened by being narrowed toward the outer periphery contacts the long film 20 ′.

  On the other hand, the horn 50 has a flat tip, and is brought into surface contact with the long film 10 ′ that becomes the inner film 10. And while long film 10 'used as the inner film 10 moves to a longitudinal direction, contacting the front end surface of the horn 50, long film 20' used as the outer film 20 piled up on this long film 10 'is obtained. It moves in the longitudinal direction while contacting the tip (outer periphery) of the receiving member (ring) 51. At this time, the ring 51 rotates around the axis corresponding to the movement of the long film 20 '.

  Then, by generating ultrasonic waves in the horn 50, the ultrasonic waves are transmitted to the ring 51 through the long films 10 'and 20', so that the vibration energy becomes heat and the long films 10 'and 20' The long films 10 ′ and 20 ′ that melt and overlap along the tip of the ring 51 are welded in a range corresponding to the tip of the ring 51. At the same time, the long film 20 ′ in contact with the ring 51 is melted at the contact portion of the ring 51, and is pushed away on both sides to be raised. As a result, the welded portion 30 ′ and the thin-walled portion 40 ′ extending in the longitudinal direction on both sides of the sheet-like food S are formed in a linear shape.

  Then, as shown in FIG. 4, by cutting the long films 10 ′ and 20 ′ between the sheet-like foods S, the sheet-shaped cooked rice processed food packaging material 1 is completed.

  Next, a packaging method and an opening method using the cooked rice processed food packaging material 1 will be described. As shown in FIGS. 6 and 7, the cooked rice processed food is placed on the inner film 10 and then the cooked rice processed food packaging material 1. Fold the whole length in half. In the present embodiment, in order to make it easier to grip the end of the outer film 20 at the time of opening, it is folded in half so that both ends in the length direction are displaced from each other.

  Then, the opposing inner films 10 are welded (sealed) by folding in half. At this time, the outer sides of the welded portions 30 are sealed at both ends in the width direction, and the vicinity of the boundary between the rectangular region 1a and the trapezoidal regions 1b and 1b is sealed at both ends in the length direction. To do. In addition, although both ends in the width direction are sealed so as to form a seal line (band-shaped seal line) L1 of a predetermined width, both end sides in the length direction are linear seal lines extending in the width direction, Or it seals so that the seal line L2 which makes | forms a very thin strip | belt shape may be formed. Thereby, when the outer film 20 is cut, the seal line L2 can be overcome. In addition, it is preferable to give easy peel property to the part (region which forms the seal line L2 extended in the width direction) which seals the both end sides of a length direction at least.

  By doing in this way, as for the packaging material 1 for cooked rice processed foods of the said structure, the welding part 30 which welded the inner film 10 and the outer film 20 is formed in the linear form extended in the length direction orthogonal to the width direction. Therefore, in the normal state, the inner film 10 and the outer film 20 are connected on both sides of the sheet-like food S, and both films wrap around the sheet-like food S. The cooked rice processed food R is in a state of being wrapped by the cooked rice processed food packaging material 1 (the inner film 10 and the outer film 20) while being separated from the sheet-like food S by the inner film 10.

  Then, as shown in FIG. 8, when any one end in the length direction of the outer film 20 is pulled outward, the outer film 20 is torn at the thin portion 40 that is weaker than the periphery. . That is, since the welded portion 30 is formed in a linear shape, the connection strength between the outer film 20 and the inner film 10 can be minimized, and the peelability of the outer film 20 can be imparted. By forming the linear thin-walled portion 40 on 30, the outer film 20 can be cut, so that the outer film 20 is pulled on the welded portion 30 by pulling the outer film 20. Can do.

  In the present embodiment, the inner film 10 and the outer film 20 are formed in a rectangular shape having a length in the longitudinal direction, and the inner film 10 and the outer film 20 extend in a direction inclined with respect to the thin portion 40. Since the corners of the four corners are cut so as to form an edge, the pulling force when the end of the outer film 20 is pulled at the time of opening is at the intersection of the edge where the tensile force is inclined and the welded portion 30 (thin wall portion 40). It acts intensively and the outer film 20 is cut starting from the intersection (thin wall portion 40). Thereby, the cutting | disconnection (opening) of the outer film 20 can be performed easily and smoothly.

  As described above, as a result of the outer film 20 being cut on the welded portions 30 on both sides of the sheet-like food S, the overlap with the sheet-like food S can be eliminated. Thereby, when pulling in the width direction, resistance due to overlapping with the outer film 20 does not occur with respect to the sheet-like food S, and the tear of the sheet-like food S can be prevented.

  As described above, according to the packaged food for processed rice 1 according to the present embodiment, the weld portion 30 is formed in a linear shape extending in the length direction, and the outer film 20 is thinner than the periphery. Since the linear thin-walled portion 40 is formed on the welded portion 30, one of the films 10a and 10b can be cut on the welded portion 30 where the two overlapped films 10a and 10b are sealed. The film and the sheet-like food S can be prevented from being broken at the time of opening, and the sheet-like food S can be prevented from being broken to the maximum.

  Further, the inner film 10 and the outer film 20 are formed in a rectangular shape having a length in the longitudinal direction, and the outer film 20 has four corners so as to form an edge extending in a direction inclined with respect to the thin portion 40. Therefore, the outer film 20 can be cut (opened) easily and smoothly.

  Then, according to the ultrasonic sealing method according to the present embodiment, the horn 50 has a flat tip that is brought into contact with the film 10 ', while the receiving member 51 has a horn having a contact area with the film 20' at the tip. The width of one direction becomes narrower toward the tip so that it is smaller than the tip of 50, and the overlapped films 10 'and 20' are sandwiched between the tip of the horn 50 and the tip of the receiving member 51, Since an ultrasonic wave having a predetermined frequency is applied from the horn 50, the film 20 ′ can be cut on the welded portion 30 ′ where the overlapped films 10 ′ and 20 ′ are welded to each other. Can have an effect.

  Further, the stacked films 10 ′ and 20 ′ and the horn 50 and the receiving material 51 sandwiching the films 10 ′ and 20 ′ are arranged in a direction perpendicular to the one direction along the surfaces of the films 10 ′ and 20 ′. Since the ultrasonic waves are applied from the horn 50 while being relatively moved, the welded portions 30 ′ and the thin-walled portions 40 ′ extend in the relative moving direction between the films 10 ′ and 20 ′, the horn 50 and the receiving material 51. Can be formed. Accordingly, the films 10 'and 20' can be linearly welded regardless of the size of the horn 50 and the receiving material 51, and the linear thin portion 40 'can be continuously formed in the welded portion. it can.

  In addition, this invention is not limited to the said embodiment, Of course, a various change can be added in the range which does not deviate from the summary of this invention.

  In the packaging material 1 for cooked rice processed food according to the embodiment, the welded portion 30 and the thin-walled portion 40 are formed by ultrasonic sealing. However, the present invention is not limited to this, for example, on the outer surface of the outer film 20. You may make it weld the inner film 10 and the outer film 20 with a laser so that the thin part 40 may be formed.

  Alternatively, the inner film 10 and the outer film 20 that are overlapped by a pair of heat seal bars may be sandwiched and welded together. Also in this case, the outer surface of the outer film 20 is melted linearly to form the thin-walled portion 40, or after the inner film 10 and the outer film 20 are welded, the outer film 20 is pressed to be welded. Alternatively, the thin portion 40 may be formed on 30. However, it goes without saying that it is preferable to perform ultrasonic sealing as in the above-described embodiment in consideration of production efficiency, stable molding of the thin portion 40, and the like.

  In the above-described embodiment, when the long films 20 ′ are welded to each other, a ring type that can rotate around the axis is adopted as the receiving material 51. However, the present invention is not limited to this. It may be of a fixed type. Even in this case, the receiving member 51 naturally has a shape that is tapered toward the tip that comes into contact with the film, that is, a portion in which the cross-sectional shape of the tip becomes a mountain shape having a ridgeline.

  In the above-described embodiment, the opposing ends of the packaged food processing food 1 that has been folded in half are sealed with each other. For example, as shown in FIG. 9, the end in the width direction is folded back toward the other side. The processed cooked rice food may be packaged in such a manner that the gussets are formed by sealing the end portions in a state of being stacked. In this case, by forming the welded portion 30 and the thin-walled portion 40 at a position near the ridge line with the end portion in the width direction turned back toward the other side, an opening form similar to the above embodiment is obtained. Can do.

  In the above embodiment, the corners of the four corners of the outer film 20 and the inner film 10 are cut out, but the present invention is not limited to this. For example, the four corners of the outer film 20 and the inner film 10 are not cut out. Any of them may remain rectangular. However, in order to concentrate the pulling force on the end portion of the thin-walled portion 40 at the time of opening, the edge that is inclined with respect to the linear thin-walled portion 40 is formed by cutting off the corner portion as in the above embodiment. It is preferable to do.

  Of course, a cut may be made at either one end of the thin portion 40. However, if the cut is made in this way, the outer film 20 may be torn from the cut. Therefore, considering the ease of opening and the prevention of careless tearing, as in the above embodiment. It is preferable to make it.

  In the said embodiment, although the inner film 10 was comprised with the two films 10a and 10b, it is not limited to this, For example, while comprising the inner film 10 with one film, with respect to the film 10 A cutting auxiliary line such as a perforation extending in the length direction may be provided. Even if it does in this way, the inner film 10 can be divided into two in the width direction, and can be opened similarly to the said embodiment.

  Moreover, in the said embodiment, although the inner film 10 was comprised by arrange | positioning two films 10a and 10b in parallel so that one end part may be piled up, it is not limited to this, For example, one end of each of the two films 10a and 10b constituting the inner film 10 may be folded and the folded one ends may be engaged with each other.

  And in the said embodiment, while arrange | positioning the horn 50 and the receiving material 51 in a fixed position as a method of forming the linear thin part 40, welding the overlap | superposed films, long film 20 'is long By moving in the direction, the linear welded portion 30 and the thin portion 40 were formed, but it is not limited to this, for example, while placing the long film 20 ′ in a fixed position, The horn 50 and the receiving member 51 may be moved in the longitudinal direction, or the welded portion 30 and the thin portion 40 are formed by moving the long film 20 ′ and moving the horn 50 and the receiving member 51. May be. Moreover, while forming so that the front-end | tip (ridgeline) of a receiving material may extend in one direction, it forms so that the plane of the horn 50 may make a length in one direction, and it is long film 10 ', 20' arrange | positioned in the fixed position. May be formed between the long film 10 ′ and 20 ′ by sandwiching the horn 50 and the receiving member 51 at a fixed position.

  The ultrasonic sealing method described in the above embodiment is not limited to the production of the packaged food 1 for cooked rice foods, and for example, in the case of producing a packaging material for packaging sandwiches, prepared bread, sweet buns, and the like. Can be adopted. That is, it can also be employed when a bag-like packaging material is produced by welding the overlapped films together, or when a packaging body (for example, pillow packaging or the like) containing food or the like is produced. Also in this case, the welding part 30 which welds the overlap | superposed films is formed in a linear form, and the thin part 40 is formed on the welding part 30 of one (outermost side) film, and the film is made into the thin part 40. Can be cut and opened.

It is explanatory drawing of the packaging material for cooked rice processed food which concerns on one Embodiment of this invention, Comprising: (a) shows an exploded perspective view, (b) shows a whole perspective view. It is explanatory drawing of the packaging material for processed rice foods concerning the embodiment, Comprising: (a) shows the figure seen from the outer film side, (b) shows the figure seen from the inner film side. The partial expanded sectional view of the packaging material for cooked rice processed foods concerning the embodiment is shown. The schematic perspective view which shows the manufacturing state of the packaging material for cooked rice processed foods concerning the embodiment is shown. It is the elements on larger scale at the time of manufacture of the cooked rice processed food which concerns on the embodiment, Comprising: The general | schematic fragmentary enlarged view of the state which welds the elongate film piled up by the ultrasonic seal is shown. The perspective view for demonstrating the packaging method of the cooked rice processed food by the packaging material for cooked rice processed food which concerns on the same embodiment is shown. The perspective view of the state which packaged the cooked rice processed food with the packaging material for cooked rice processed food concerning the embodiment is shown. The perspective view at the time of opening the packaging material for cooked rice processed food which concerns on the embodiment is shown. The perspective view of the state which packaged the cooked rice processed food with another aspect with the packaging material for cooked rice processed food which concerns on the embodiment is shown.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Wrought food packaging material, 10 ... Inner film, 10 '... Long film, 10a, 10b ... Film, 20 ... Outer film, 20' ... Long film, 30 ... Welding part, 40 ... Thin part, 50 ... Horn, 51 ... Receiving material (ring), L1, L2 ... Seal line, S ... Sheet food

Claims (4)

An inner film configured to be separable in the width direction and an outer film superimposed on the inner film via the sheet-like food, and a welded portion extending in the length direction perpendicular to the width direction on both sides of the sheet-like food In the packaged food for cooked rice food, in which an inner film and an outer film are welded to each other, the weld portion is formed in a linear shape extending in the length direction, and the outer film is thinner than the periphery. A packaged material for cooked rice processed food, characterized in that a thin-walled portion which is a thin-walled portion and is formed on the welded portion to impart cutting properties only to the outer film .   The inner film and the outer film are formed in a rectangular shape having a length in the longitudinal direction, and at least the outer film is cut at the corners of the four corners so as to form an edge extending in a direction inclined with respect to the thin-walled portion. The packaging material for cooked rice processed foods according to claim 1. The film which becomes the inner film and the film which becomes the outer film of the packaging material for cooked rice processed food according to claim 1 or claim 2 are overlapped , and each film is sandwiched between a horn and a receiving material, and the horn has a predetermined frequency. In the ultrasonic sealing method in which the superposed films are welded together by applying ultrasonic waves, the horn has a flat tip formed in contact with the film to be an inner film, while the receiving material is The width of at least one direction is made narrower toward the tip so that the contact area with the film that becomes the outer film at the tip becomes smaller than the tip of the horn, and the stacked film is formed at the tip of the horn and the tip of the receiving material. sandwiched between by applying ultrasonic predetermined frequency from said horn, said to form a linear welding portion extending in the longitudinal direction, contact on the solution attaching portion That the composed film outside the film, a linear thin portion becomes thinner than the peripheral, ultrasonic sealing, characterized in that to form a thin portion that imparts cut resistance only to the film to be the outside of the film Method.   4. The ultrasonic wave according to claim 3, wherein the ultrasonic wave is applied from the horn while relatively moving the superposed film, the horn sandwiching the film, and the receiving material in a direction perpendicular to the one direction along the surface of the film. Sealing method.

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