JP2023114043A - Ultrasonic lateral seal device in bag-making filling machine - Google Patents

Abstract

To provide an ultrasonic lateral seal device in a bag-making filling machine capable of hermetically packing without causing sealing defects such as pin-holes or edge cuttings in a lateral seal part.SOLUTION: When a cylindrical film 10 is laterally sealed while being held by an anvil and a seal surface of a horn formed of a flat surface without irregularities, corrugated protruding parts 50 are continuously provided on facing surfaces 42 of the anvil facing the seal surface of the horn in a width direction of the cylindrical film 10. Thereby, the cylindrical film 10 can be laterally sealed excellently without causing sealing defects such as pin-holes or edge cuttings in a lateral seal part formed through lateral sealing performed with the horn and the anvil.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic horizontal sealing device in a bag-making and filling machine, in which vertical sealing is applied to a cylindrically formed packaging material, and horizontal sealing is performed at the front and rear positions of sandwiching an article supplied into the cylindrical packaging material. be.

In a packaging machine such as a horizontal form-fill-seal machine, a film (packaging material) pulled out from a raw roll and guided by a bag-making means is formed into a tubular shape by overlapping both edges in the width direction. In addition to applying vertical seals in the direction of transport of the film to the part, horizontal seals intersecting the transport direction are applied at the front and rear positions of each article fed into the tubular film to obtain pillow-packaged products. In a packaging machine, when obtaining a pillow-packaged product laterally sealed by a linear sealing line by an ultrasonic sealing device, a film is sandwiched between a horn and an anvil, and ultrasonic vibrations from the horn are applied to the sandwiched portion of the film. , and the film is welded to form a horizontal seal that forms a linear seal line. The portion of the film held between the horn and the anvil can be a four-layered portion or a three-layered portion, including the vertical seal portion, depending on the film edge polymerization method (hand-to-hand attachment or envelope attachment). There is an overlapped portion in which the thickness of the overlapped portion differs from that of the double overlapped portion where two layers of films not including the vertical seal portion are overlapped. For this reason, in the overlapped portion of four or three layers, the horn and the anvil are sandwiched by excessive pressure, and the ultrasonic vibration from the horn is transmitted. On the other hand, there is a problem that sealing is not properly performed over the entire width direction, such as insufficient sealing at the double overlapping portion.

In view of the above-mentioned problems, several techniques have been developed in which a recess is provided in the anvil in response to changes in the thickness of the film where the vertical seal portion is located in order to transmit ultrasonic waves uniformly throughout the horizontal seal portion. Proposed. For example, in Patent Document 1, as an ultrasonic sealing device for manufacturing paper containers for beverages, an anvil that presses a tubular packaging material between a horn and a left anvil and a right anvil that are partially in contact with each other. and a recess is provided in the vicinity of the contact portion to accommodate the vertical seal portion when pressed. Further, by changing the lateral positions of the left anvil and the right anvil, the position and size of the recess can be changed.

JP 2017-52520 A

The ultrasonic sealing device of Patent Document 1 includes detection means for detecting the position and width of the vertical seal portion in the horizontal direction. The position and size of the dent caused by this are configured to be adjustable at the time of lateral sealing. Such measures are taken in beverage bag manufacturing and filling, where thick composite packaging materials with paper-backed films are used. In a packaging machine, the edges of the packaging material are overlapped and pasted, and the overlapped parts are vertically sealed to form a square tube shape and then conveyed to the horizontal sealing position. Meandering or the like is less likely to occur, and therefore it is effective to provide such a compatible device. However, in a horizontal form-fill-seal machine, a thin packaging material is adopted, and the surroundings of the articles fed into the cylindrical packaging material are guided free, so the packaging material conveyed to the horizontal sealing position Easy to meander. In addition, the position and width of the vertical seal are detected by the position and width of the vertical seal, which are displaced due to twisting and twisting in the circumferential direction of the cylindrical packaging material before reaching the position of the horizontal seal. Therefore, there arises a problem that the alignment of the recesses cannot be accurately performed. In addition, it has been pointed out that the vertical seal portion does not fit in the dent and seals corresponding to the 4-fold or 3-fold overlapping portion cannot be formed, and pinholes and edge cuts occur in the seal portion, resulting in poor sealing. be.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ultrasonic horizontal sealing device in a bag-making and filling machine capable of hermetic packaging without causing sealing defects such as pinholes and cut edges in ultrasonically-sealed horizontal sealing portions.

The ultrasonic horizontal sealing device in the bag making and filling machine of the invention according to claim 1 of the present application is
A horn (20) and an anvil (22) are provided before and after sandwiching an article (12) supplied in a cylindrical packaging material (10) which has been cylindrically molded and vertically sealed. An ultrasonic horizontal sealing device in a bag-making and filling machine that clamps and cuts the cylindrical packaging material (10) in a width direction that intersects with the conveying direction,
The anvil (22) has a pair of front and rear sealing surfaces (34, 34) that sandwich the cutting position of the packaging material of the horn (20), and when the cylindrical packaging material (10) is sandwiched and laterally sealed, the The corrugated projections (50, 52, 54) continuous in the width direction of the tubular packaging material (10) facing each sealing surface (34) of the horn (20) are sealed in the horn (20). It is characterized in that it is formed within the front-rear width of the surface (34).
According to the first aspect of the invention, since the pressure applied by the horn and the anvil does not concentrate linearly in the width direction on the cylindrical packaging material during horizontal sealing, the vertical sealing portions overlap and the packaging material is triple or quadruple. Appropriate ultrasonic vibration can be applied to the overlapped area and the doubled area, and the welding surface of the packaging material is sufficiently softened and melted, preventing sealing defects such as pinholes and edge breaks. Lateral sealing can be performed satisfactorily without incurring In addition, since the anvil is not provided with a concave portion that accommodates a region in which the tubular packaging material is triple or quadruple, even if the longitudinal seal portion is displaced due to meandering of the tubular packaging material, etc., A good lateral seal can be applied over the entire length of the width direction of the tubular packaging material. Furthermore, in the case of a rotary type horizontal sealing device, when the projection of the anvil rotates and the cylindrical packaging material is sandwiched between the sealing surface of the horn, it collides in a straight line across the entire width of the packaging material and pressurizes it. It is possible to disperse the sealing pressurizing force in the rotational direction and effectively perform lateral sealing. Furthermore, since the protruding portion of the anvil is formed within the range of the front and rear width of the sealing surface of the horn, the protruding portion does not protrude from the front and rear of the sealing surface during horizontal sealing, and the ultrasonic vibration is transmitted to the holding portion of the packaging material. By effectively transmitting the heat, it is possible to effectively soften and melt the welding surface of the packaging material.

In the invention according to claim 2, the protruding portion (54) is the first region (44) in which the vertical sealing portion (14) of the cylindrical packaging material (10) overlaps to form a triple or quadruple packaging material. The interval (P2) between the crests (56a) or the valleys (56b) of the portion (56) that sandwiches the second region (46) outside the vertical seal portion (14) where the packaging material is doubled is wider than the interval (P3) between the corresponding ridges (58a) or troughs (58b) of the portion (58) that holds the .
According to the second aspect of the invention, in the first region and the second region having different thicknesses, the pressure applied to the packaging material is dispersed corresponding to the portions having different overlapping thicknesses of the packaging material during lateral sealing, and the pressure is applied at high speed. Even in packaging materials that are difficult to weld depending on the packaging conditions, such as packaging, suitable ultrasonic vibrations are transmitted to the packaging materials in each of the first and second regions to form a horizontal seal portion. can.

In the invention according to claim 3, the protruding portions (50, 52) are configured such that peaks (50a, 52a) and valleys (50b, 52b) formed in the same arc shape extend in the width direction of the tubular packaging material (10). It is characterized by having a wave shape that continues to.
According to the third aspect of the invention, since the same arc-shaped ridges and troughs are connected so as to be continuous, processing for forming the projecting portion of the anvil is facilitated. In addition, the pressure applied to the packaging material during lateral sealing can be made uniform, and good lateral sealing can be performed over the entire widthwise length of the cylindrical packaging material.

In the invention according to claim 4, the connection portions (50c, 56c) between the peaks (50a, 56a) and the valleys (50b, 56b) of the projections (50, 54) are sloped surfaces not perpendicular to the width direction. characterized by being formed by
According to the fourth aspect of the present invention, during lateral sealing, the melted sealant can effectively flow easily without remaining partially, and the sealant can properly flow into the sealing region to form a hermetic seal. .

According to the present invention, since the pressure applied by the horn and the anvil is not concentrated linearly in the width direction on the cylindrical packaging material during horizontal sealing, the vertical sealing portions overlap and the packaging material becomes triple or quadruple. It is possible to properly transmit ultrasonic vibration to the packaging material to the area and the overlapping area, and to perform good horizontal sealing without causing sealing failure such as pinholes and edge breakage. can. Also, even if the vertical sealing portion is displaced due to meandering of the cylindrical packaging material, etc., it is possible to perform good horizontal sealing over the entire widthwise length of the cylindrical packaging material.

1 is a schematic configuration diagram of an ultrasonic horizontal sealing device; FIG. FIG. 2 is a schematic side view of a main part of the ultrasonic horizontal sealing device; FIG. 4 is a plan view of an anvil; (a) is a plan view of the facing surface of the seal bar, and (b) is a cross-sectional view of the tubular film. It is a longitudinal cross-sectional view along the film transport direction of the anvil. It is a top view of the opposing surface in the anvil of 1st another Example. It is a top view of the opposing surface in the anvil of 2nd alternative Example. FIG. 10 is an enlarged photograph showing an edge cut defect that occurs in a lateral seal portion; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Next, a preferred embodiment of an ultrasonic horizontal sealing device in a bag making and filling machine according to the present invention will be described below with reference to the accompanying drawings. In the embodiments, a horizontal bag-making and filling machine will be described as an example of a packaging machine that employs an ultrasonic horizontal sealing device.

A horizontal form-fill-fill-seal machine (packaging machine) forms a tubular film (tubular packaging material) 10 by polymerizing a band-shaped film (packaging material) pulled out from a raw fabric roll so that both edges in the longitudinal direction are joined together. bag-making means, a supply conveyor for supplying the articles 12 toward the tubular film 10 at predetermined intervals, and a longitudinal seal directed in the film conveying direction to the overlapped portion of the tubular film 10 overlapped in a palm-to-arm shape. A vertical sealing device, film conveying means for sandwiching the overlapped portion of the tubular film 10 and conveying the tubular film 10 toward the vertical sealing device, and articles 12 supplied into the tubular film 10 at predetermined intervals. and an ultrasonic horizontal sealing device that clamps the tubular film 10 at front and rear positions thereof and performs horizontal sealing and cutting in a direction (width direction) intersecting the film conveying direction. The ultrasonic horizontal sealing device transversely seals and cuts the tubular film 10 in a state in which the longitudinally sealed portion 14, which has been longitudinally sealed by the longitudinally sealing device, is folded over the bag body.

As shown in FIG. 1, the ultrasonic horizontal sealing device has a pair of rotating shafts 16 and 18 that rotate in opposite directions across the conveying path of the tubular film 10. One rotating shaft (first rotating shaft) ) 16, an anvil 22 disposed on the other rotating shaft (second rotating shaft) 18, and a vibration generating means 24 disposed on the first rotating shaft 16. The vibration generating means 24 includes a converter for generating ultrasonic waves, a booster for amplifying the ultrasonic waves, and the like, and is configured to ultrasonically vibrate the horn 20 with a predetermined amplitude. 10 is sandwiched between the horn 20 and the anvil 22 at a predetermined pressure, and is configured to be laterally sealed in the width direction by ultrasonic vibration. The pair of rotating shafts 16, 18 are rotatably supported by a pair of supporting members 26, 26 spaced apart in the width direction, and are arranged upwardly across the conveying path between the pair of supporting members 26, 26 in the embodiment. A horn 20 is arranged and an anvil 22 is arranged below. The second rotating shaft 18 on which the anvil 22 is arranged is linked to a drive motor (not shown) such as a servomotor through a transmission mechanism 28 such as a gear mechanism or a chain-sprocket mechanism. The anvils 22 are rotationally driven in mutually opposite directions.

As shown in FIGS. 1 and 2, the horn 20 is provided with a plurality of (in the embodiment, two at 180° intervals) first seal portions 30 extending radially and spaced apart in the circumferential direction. The outer peripheral surface of the 1 seal portion 30 is formed in an arc shape corresponding to the radius of rotation of the horn 20 . Further, the first seal portion 30 is formed with a recess 32 that is recessed in the radial direction from the outer peripheral surface so as to extend in the width direction. The surfaces 34, 34 are formed to extend linearly in the width direction.

As shown in FIGS. 1 and 2, the anvil 22 has radially protruding seal bars 36 paired with the first seal portions 30 of the horn 20, which are spaced apart in the circumferential direction and attached to and detached from the holder 22a. provided interchangeably. The anvil 22 is formed with a through hole 38 penetrating in the radial direction and having a predetermined length in the width direction so as to open at the outer peripheral surface of each seal bar 36 . It is supported so that it can reciprocate in the direction. Each seal bar 36 has a pair of opposing surfaces 42, 42 forming a pair with the pair of seal surfaces 34, 34 of the horn 20 extending in the width direction on both sides in the rotational direction across the through hole 38. there is The facing surface 42 is formed in an arc shape corresponding to the radius of rotation of the anvil 22 . As shown in FIGS. 3 to 5, the opposing surface 42 is provided with a protruding portion 50 that protrudes from the opposing surface 42 and continues in the width direction of the tubular film 10 in a wavy shape having a predetermined width. . The length of the protrusion 50 in the width direction is set longer than the width dimension of the tubular film 10 . Then, the horn 20 and the anvil 22 rotate with respect to the tubular film 10 being conveyed, and the tubular film 10 is moved in the width direction on both front and rear sides of the article 12 which is supplied into the tubular film 10 at predetermined intervals. The tubular film 10 is sandwiched between the sealing surface 34 of the horn 20 and the protruding portion 50 over the entire length of the horn 20, and the ultrasonic vibration emitted from the horn 20 is transmitted to the sandwiching portion to melt the sealant of the packaging material, resulting in a tubular shape. A hermetically sealed lateral seal portion is formed to intersect with the transport direction of the film 10 . In the packaging machine, as shown in FIG. 4(b), the vertically sealed portion 14, which has been vertically sealed by the vertically sealing device, is folded over the body of the bag. In the ultrasonic horizontal sealing device, the vertical sealing portion 14 is folded over the bag body to form a first region 44 in which the film is four-layered, and second regions 46a and 46b in which the film is double-layered outside the vertical sealing portion 14. are sandwiched between the sealing surface 34 and the protruding portion 50 at once to laterally seal. In addition, in a configuration in which the overlapped portion, which is overlapped in the width direction center of the tubular film 10 and vertically sealed, is tilted to one side, the width direction sandwiching the first region 44 of the tubular film 10 is set to one side. The width dimensions of the second regions 46a and 46b located on one side and the other side are different. In addition, in the configuration in which the longitudinally sealed overlapped portion is formed to have a constant width, the ratio of the widths of the left and right second regions 46 a and 46 b changes according to the width dimension of the strip film 10 .

As shown in FIG. 2, the cutting means 40 has a blade portion 40a on each seal bar side and is linked to reciprocating means (not shown) for reciprocating the cutting means 40 in the radial direction. The reciprocating means operates the cutting means 40 at the timing when the tubular film 10 is sandwiched between the sealing surface 34 and the protruding portion 50, and the cutting portion 40a instantaneously protrudes radially from the protruding portion 50 to cut the sealing surface. It is configured to laterally cut the tubular film 10 sandwiched between 34 and the projecting portion 50 . The blade portion 40a protruding from the protruding portion 50 is received in the recess 32 without contact between the pair of sealing surfaces 34, 34 of the horn 20 located in front of and behind the cutting position of the tubular film 10. As shown in FIG.

As shown in FIG. 4, when the tubular film 10 is laterally sealed, the projecting portion 50 is formed in a wave shape in which peak portions 50a and trough portions 50b are positioned and connected in front and behind in the film conveying direction in plan view. When the tubular film 10 is laterally sealed by the rotation of the horn 20 and the anvil 22, the projecting portion 50 does not collide with the sealing surface 34 of the horn 20 with the tubular film 10 interposed therebetween by line contact. Configured. The peak portion 50a and the valley portion 50b are both formed in an arc shape, and are connected in an arc shape by an arc having the same radius R1. The troughs 50b are continuously connected to form a wave shape. Thus, it is desirable that the connection portion 50c between the peak portion 50a and the valley portion 50b is formed by a slope that is not orthogonal to the width direction of the tubular film 10 as in this embodiment. In the embodiment, the connection portion 50c is inclined so that the connection portions 50c, 50c adjacent in the width direction are widened toward the front or rear in the film conveying direction, and protrude from the sealing surface 34. Since the melted sealant at the pinched portion between the portion 50 and the portion 50 effectively flows without remaining partially, a good sealing portion can be obtained without causing poor sealing. Moreover, the projecting portion 50 is formed within the range of the front-to-rear width in the direction crossing the width direction of the sealing surface 34 of the facing horn 20 . That is, the front-to-rear width L1 of the protruding portion 50 (the height dimension of the wave portion, which is the dimension from the crest of the wave to the bottom of the trough) is shorter than the front-to-rear width L2 (see FIG. 2) of the seal surface 34 of the horn 20. With this setting, when the tubular film 10 is laterally sealed, the projecting portion 50 is configured not to protrude forward and backward from the seal surface 34 of the horn 20 . As shown in FIGS. 4 and 5, the protrusion 50 protrudes from the opposing surface 42 over the entire width with the same height M and width N, and the protruding ends (the top of the mountain and the bottom of the valley) are For example, it has a narrow flat surface with a width F of about 0.1 mm and is formed in a cross-sectional shape in which both sides sandwiching the projecting end are arcuate. In addition, the protrusion 50 has a front-rear width L1 of the protrusion 50, an interval P between the peak 50a and the valley 50b, a height M of the protrusion 50, a width N of the protrusion 50, a peak 50a and a valley 50b. is set to, for example, L1: 3.0 mm, P: 2.5 mm, M: 0.2 mm, N: 0.5 mm, and R1: 0.75 mm.

Next, the operation of the ultrasonic horizontal sealing device in the horizontal bag making and filling machine according to the embodiment will be described.

In the ultrasonic lateral sealing device of the embodiment, the protruding portion 50 of the anvil 22, which sandwiches the tubular film 10 between the sealing surface 34 of the horn 20 and the tubular film 10, is formed in a corrugated shape continuous in the width direction of the tubular film 10. When the tubular film 10 is laterally sealed, no linear pressure is applied in the width direction, and the applied pressure is dispersed in a predetermined range, and ultrasonic vibration is applied to the first region 44 and the second region 46. can be appropriately given, the softening/melting of the welded surface of the film is sufficient, and good lateral sealing can be performed without incurring sealing defects such as pinholes and edge breakage. Further, since the protrusion 50 is configured not to protrude forward and backward from the seal surface 34 of the horn 20 at the time of lateral sealing, the ultrasonic vibrations emitted from the horn 20 are transmitted to the sandwiched portion between the seal surface 34 and the protrusion 50. It is effectively transmitted and can effectively melt the sealant of the packaging material. In addition, since the anvil 22 is not provided with a concave portion in accordance with the position of the overlapped portion of the vertical seal portion 14, the vertical seal portion 14 may be displaced (moved) in the width direction of the tubular film 10 due to meandering of the tubular film 10 or the like. ), it is possible to seal the entire length of the tubular film 10 in the width direction and form an appropriate lateral seal portion without causing a sealing failure due to the degree of misalignment. Further, in the rotary type horizontal sealing device of the embodiment, the protruding portion 50 of the anvil 22 linearly collides with the sealing surface 34 of the horn 20 with the tubular film 10 interposed therebetween in a direction orthogonal to the rotating direction to apply pressure. By distributing the pressurizing force in the circumferential direction of the sealing surface 34 without being compressed, it is possible to perform the lateral sealing more effectively without causing edge breakage.

In addition, since the connection portion 50c between the peak portion 50a and the valley portion 50b of the protruding portion 50 is not formed as a straight portion perpendicular to the width direction of the tubular film 10, but is inclined, the melted sealant is evenly distributed. By effectively flowing without staying in the part, sealing performance can be further improved without causing sealing failure. The protruding portion 50 is formed by connecting the arc-shaped peak portion 50a and the trough portion 50b of the same size and having the same circular arc so as to be continuous in the width direction of the tubular film 10. Therefore, the protruding portion 50 of the anvil 22 is The processing related to the formation is easy, the pressure applied to the packaging material at the time of horizontal sealing can be equalized in the front and rear width direction of the projecting portion 50 (the height direction of the corrugated portion), and the entire width direction of the tubular film 10 A good lateral seal can be provided over the entire length.

(About another example)
FIGS. 6 and 7 show another embodiment of the projection provided on the anvil 22. Only parts different from the embodiment will be described, and the same members as those described above will be given the same reference numerals.

The protruding portion 52 of the first alternative embodiment shown in FIG. 6 is set such that the interval between the peak portion 52a and the valley portion 52b is set narrower than in the example, and the peak portion 52a and the valley portion 52b are both formed in an arc shape. It is A connection portion 52c between the peak portion 52a and the valley portion 52b is formed by a straight portion orthogonal to the film conveying direction. Also in the projecting portion 52 of the first alternative embodiment, it is possible to obtain the same effects as those of the above-described embodiment. In the configuration of the first alternative embodiment, for example, the dimensions of each part of the projecting portion 52 are the same as in the above-described embodiment, the height M of the projecting portion 52 and the width N of the projecting portion 52 are the same as in the above-described embodiment, the front-to-rear width L3, and the peak portion 52a. The distance P1 from the valley portion 52b and the radius R2 of the peak portion 52a and the valley portion 52b are set to L3: 2.5 mm, P1: 2.0 mm, and R2: 1.5 mm.

A protruding portion 54 of a second alternative embodiment shown in FIG. 7 is formed by connecting a first continuous portion 56 and a second continuous portion 58 having different corrugated shapes so as to be continuous in the width direction. A first continuous portion 56 is positioned corresponding to the first region 44 where the vertical seal portions 14 of 10 overlap, and a second continuous portion 58 is positioned corresponding to the second region 46 of the tubular film 10. be done. The first continuous portion 56 and the second continuous portion 58 are formed at the same height. The interval P2 between the peak portions 56a and the valley portions 56b forming the first continuous portion 56 is set wider than the interval P3 between the peak portions 58a and the valley portions 58b forming the second continuous portion 58. As shown in FIG. Thus, by making the number of peaks 56a and valleys 56b per unit area in the first continuous portion 56 smaller than the number of peaks 58a and valleys 58b per unit area in the second continuous portion 58, When the tubular film 10 is laterally sealed during lateral sealing, the pressure per unit area of the tubular film 10 corresponds to the first region 44 rather than the second continuous portion 58 corresponding to the second region 46. The first continuous portion 56 is made lower. The first continuous portion 56 is formed in the same shape as the projecting portion 50 of the above embodiment, and the second continuous portion 58 is formed in the same shape as the projecting portion 52 of the first alternative embodiment.

The protruding portion 54 of the second alternative embodiment reduces the pressure applied to the tubular film 10 during lateral sealing from the second continuous portion 58 corresponding to the second region 46 to the first continuous portion 56 corresponding to the first region 44 . was made lower. As a result, the pressure balance applied to the tubular film 10 during lateral sealing is adjusted between the first region 44 and the second region 46 having different thicknesses, so that welding is difficult depending on the packaging conditions such as high-speed packaging. Even in the film material, suitable ultrasonic vibrations are transmitted to the packaging materials of the first region 44 and the second region 46 to form a hermetically sealed horizontal seal portion. It should be noted that the protruding portion 54 of the second alternative embodiment can also provide the same effects as those of the above-described embodiment. In the configuration of the second alternative embodiment, for example, the dimensions of each part of the projecting portion 54 are the same as in the above embodiment, the height M of the projecting portion 54 and the width N of the projecting portion 54 are the same as in the above-described embodiment, the front-to-rear width L4, and the first continuous portion The interval P2 between the peak portion 56a and the valley portion 56b at 56 and the interval P3 between the peak portion 58a and the valley portion 58b at the second continuous portion 58 are L4: 6.0 mm, P2: 4.5 mm, and P3: 1. Set to .0 mm. Further, the peak portion 56a and the valley portion 56b of the first continuous portion 56 are formed in an arc shape with a radius R3 of 2.0 mm, whereas the peak portion 58a and the valley portion 58b of the second continuous portion 58 are formed in an arc shape with a radius R4. is formed in an arc of 1.5 mm.

In this example, an OP/CP film having a thickness of 40 μm, in which oriented polypropylene (OP) and non-oriented polypropylene (CP) are laminated, is used. The film clamping pressure between the horn and the anvil is set to 0.15 to 0.2 Mpa by the sealing device, the cut length (cut pitch) of the cylindrical film is set to 80 mm, and the packaging speed is set to 300 bags/minute. Then, a test was conducted in which a lateral seal was applied. Further, the specifications of each part of the projecting portion provided on the anvil used in the test example were as shown below.
・Front-to-back width L1 of the protrusion: 3.0 mm
・Interval P between peaks and valleys: 2.5 mm
・Protrusion height M: 0.2mm
・Width of protrusion N: 0.5mm
In addition, in the description of the embodiment, the first alternative embodiment, and the second alternative embodiment, the above-mentioned dimensions of each part of each projecting part 50, 52, 54 are all based on a belt-shaped film with a thickness of 40 μm. It is shown in the case of

As a comparative example, a packaging material was sandwiched between a horn having a flat sealing surface and an anvil having one or two projections extending linearly in the width direction on the sealing surface. In the conventional apparatus for sealing, when lateral sealing is performed under the same packaging conditions, the lateral sealing portion corresponding to the first region of the tubular film, as shown in FIG. The melted sealant melted out of the sandwiched portion, and excessive pressure was applied to the film, resulting in edge breakage.
On the other hand, according to the present embodiment, pinholes and edge cuts are not caused in the laterally sealed portion of the first region of the tubular film, and the laterally sealed portion of the second region is hermetically sealed to form a tubular film. It was verified that good lateral sealing was performed over the entire length of the film in the width direction without sealing failure.

(Change example)
The present invention is not limited to the configurations of the embodiments and the like, and can be modified, for example, as follows. In addition, without being limited to the following modification examples, various embodiments can be adopted within the scope of the present invention for the configurations described in the examples and the like.
(1) In the embodiment, the horn 20 and the anvil 22 are provided with two pairs each of the seal head 30 and the seal bar 36, but one pair or three or more pairs may be provided.
(2) In the embodiment, a rotary sealing method is used in which the horn 20 and the anvil 22 provided on the rotating shafts 16 and 18 perform horizontal sealing. It is possible to adopt a box motion method in which ultrasonic sealing is performed while simultaneously.
(3) It can also be applied to the anvil 22 when laterally sealing the tubular film 10 in which the edge portion of the belt-shaped film is attached to the envelope to form a vertical seal portion and the first regions 44 are stacked in three layers. .
(4) The shape of the peaks 50a, 52a, 56a, 58a and the valleys 50b, 52b, 56b, 58b of the projections 50, 52, 54 is not limited to an arc shape, and the slopes are formed so that they intersect in a V shape with straight lines. may be
(5) The connecting portions 50c, 52c, 56c, and 58c of all the projecting portions 50, 52, and 54 are oriented along the conveying direction of the tubular film 10 according to the properties of the packaging material to be sealed and various packaging conditions. It is possible to employ a configuration that is inclined downward (a configuration that is not perpendicular to the width direction of the tubular film 10). In addition, the front-to-rear width of the first continuous portion 56 (the height dimension of the wave portion = the dimension from the top of the wave to the bottom of the valley) and the front-to-rear width of the second continuous portion 58 (the wave portion height dimension=the dimension from the crest of the wave to the bottom of the trough).
(6) The packaging material is not limited to a synthetic resin film. For example, it can be applied to a composite packaging material in which a sealant film such as CPP is attached to a paper substrate having a thickness of about 60 μ to 80 μm.
(7) It can also be used as a horizontal sealing device for vertical bag making and filling machines and other horizontal and vertical filling machines.

REFERENCE SIGNS LIST 10 cylindrical film (cylindrical packaging material), 12 article, 14 vertical sealing portion, 20 horn 22 anvil, 34 sealing surface, 44 first region, 46 second region, 50 projecting portion 50a peak portion, 50b valley portion, 50c Connection portion 52 Protruding portion 52a Mountain portion 52b Valley portion 54 Protruding portion 56 First continuous portion (a portion that sandwiches the first region)
56a peak, 56b valley, 56c connecting portion 58 second continuous portion (the portion sandwiching the second region), 58a peak, 58b valley P2 Distance between the peaks or valleys of the portion sandwiching the first region P3 Spacing between ridges or troughs of portions sandwiching the second region

Claims (4)

A cylindrical packaging material that has been formed into a cylindrical shape and subjected to vertical sealing is sandwiched between a horn and an anvil before and after sandwiching an article supplied in the cylindrical packaging material, so that the conveying direction of the cylindrical packaging material intersects. An ultrasonic horizontal sealing device in a bag making and filling machine that performs horizontal sealing and cutting in the width direction,
The anvil has a pair of front and rear sealing surfaces sandwiching the cutting position of the packaging material of the horn, and when the tubular packaging material is sandwiched and transversely sealed, the anvil faces the respective sealing surfaces of the horn. An ultrasonic horizontal sealing device for a bag-making and filling machine, characterized in that a wavy protrusion that is continuous in the width direction is formed within a front-rear width range of a sealing surface of the horn. The protruding portion is arranged so that the vertical seal portions of the cylindrical packaging material overlap and the first region where the packaging material is triple or quadruple is sandwiched, and the distance between the peaks or valleys is adjusted outside the vertical seal portion. 2. An ultrasonic horizontal sealing device in a form-fill-seal machine according to claim 1, wherein the second region, where the packaging material is doubled, is wider than the interval between the corresponding ridges or troughs of the clamping portion. 2. An ultrasonic horizontal seal for a bag-making and filling machine according to claim 1, wherein said protruding portion has a peak portion and a valley portion which are formed in the same arc shape and have a wavy shape which is continuous in the width direction of the tubular packaging material. Device. 4. The ultrasonic wave in the form-fill-seal machine according to claim 1, wherein the connecting portion between the peak portion and the valley portion of the projecting portion is formed by a slope not perpendicular to the width direction. Horizontal sealing device.

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