JP2007168845A - Heat-sealing edge for use of heat-sealing roll, and heat-sealing roll using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To widen a sealing temperature range with which an article to be packaged can packaged by effectively suppressing heat transfer from a pair of heat-sealing edges to the article and a sealant layer when the pair of heat-sealing edges displace to come closer to each other, and to enable stable and reliable fusion-joint while the article is rapidly packaged. <P>SOLUTION: The heat-sealing edge for use of a heat-sealing roll is mounted on each of a pair of rolls which are located in parallel to and close to each other and driven to rotate reversely to each other and extend in their axial direction, has a surface exhibiting an arc along the circumference of the roll, and pinches a packaging laminate film between the edges for fusion-joining the film. Only the center part except a leading end and a following end in the rotation direction for sealing at least one of surfaces of the opposite edges is formed as a fine uneven rough area. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat sealing blade for a heat sealing roll that heat-seals a laminated film, most often a laminated film, and more particularly to an automatic filling and packaging device that seals foreign substances such as liquids and liquid substances as packages. The present invention relates to a heat seal blade for a heat seal roll used as a horizontal seal blade and a heat seal roll using the heat seal blade.

  The arc-shaped surface of the heat seal blade for heat seal roll (hereinafter also referred to as a horizontal seal blade) used in the automatic filling and packaging apparatus is generally a smooth surface having a mirror finish, as shown in FIG. As shown in FIG. 2, the two cylinders 111 are arranged so as to extend in the axial direction on the respective circumferential surfaces of a pair of rolls 111 that are arranged close to each other and are driven to rotate in opposite directions. And the horizontal seal | sticker by an automatic filling packaging apparatus is for the packaging for which the said pair of rolls 111 are rotationally displaced from the position shown by a virtual line in FIG. The film 113 can be applied by being sandwiched between the horizontal seal blades 112.

  However, in the above lateral sealing method, the contact area between the packaging film 113 and the lateral sealing blade 112 from the position indicated by the phantom line to the sealing position indicated by the solid line in FIG. A large amount of heat is transferred from the horizontal sealing blade 112 heated to the set temperature to the packaged article 114 that is continuously supplied to the inside through the packaging film 113. For this reason, the surface temperature of the horizontal seal blade 112 decreases until it reaches the work position indicated by the solid line in FIG. 6, while the article to be packaged and the sealant layer of the packaging film 113 are unnecessarily heated. There was a problem that.

  Note that unnecessary heating of the package may damage various properties of the package, and unnecessary heating of the sealant layer causes excessive melting at an early stage of the sealant layer. There is a risk of lowering the viscosity. This decrease in the viscosity of the sealant layer causes a part of the article 114 to be wrapped in the transverse seal portion 115 during transverse sealing, as illustrated in an enlarged cross-sectional view in FIG. There is a problem in that 114 expands (foams) while peeling off the seal of the lateral seal portion 115 that is fusion-bonded by further heating by the lateral seal blade 112.

  In order to solve the above-mentioned problem, in Patent Document 1, a fine uneven rough surface is formed on the entire surface of the horizontal sealing blade, and the contact area between the horizontal sealing blade and the packaging film is reduced. A method has been proposed in which the amount of heat transferred to the packaging film and the packaged article is suppressed, and the temperature drop of the horizontal seal blade and the inclusion of the packaged article in the horizontal seal portion and the occurrence of foaming caused thereby are suppressed.

However, the surface temperature of the edge portion of the sealing blade is lower than that of the central portion due to heat dissipation, and in Patent Document 1, a rough surface is uniformly formed on the entire surface of the sealing blade to increase the contact area with the packaging film. Since it is made small, the amount of heat transferred from the edge of the sealing blade to the packaging film is further reduced, which may cause a sealing failure such as unbonding of the film. Therefore, the method of Patent Document 1 has a problem that the lower limit value of the seal blade temperature has to be set higher than that of the prior art.
JP 2005-112454 A

An object of the present invention is to solve such problems of the prior art, and the object of the present invention is to provide heat in the close proximity of the pair of heat seal blades. By effectively suppressing the heat transfer from the sealing blade to the package and the sealant layer, and suppressing the occurrence of foaming at the seal part, the seal temperature range (hereinafter referred to as the allowable seal temperature range) It is to provide a heat seal blade for a heat seal roll, in particular, a horizontal seal blade, which can spread a stable and reliable fusion bonding under high-speed filling of a package.
Another object of the present invention is to increase the allowable seal temperature range by effectively controlling the way heat is transmitted from the heat seal blade to the packaging film in accordance with the type of the package. An object of the present invention is to provide a heat seal blade for a heat seal roll, particularly a horizontal seal blade.

The present invention was developed in order to overcome the above-mentioned problems of the prior art, and is disposed on at least one of a pair of rolls that are arranged in parallel and opposed to each other and rotated in opposite directions, It is attached so as to extend in the axial direction, and the surface forms an arc shape along the circumferential direction of the roll, and the laminated film is sandwiched between the opposing films by sandwiching the laminated film. A heat seal blade for heat seal rolls to be fusion bonded,
Of at least one surface of the opposed heat seal blades, excluding the end on the side preceding the rotation direction (preceding side end) and the end on the following side (following side end) on the seal The present invention proposes a heat seal blade for a heat seal roll characterized in that only the central portion is a fine uneven rough surface portion.

  In the present invention, it is preferable that the rotation direction length d of the central portion is d / D = 0.3 to 0.95 with respect to the rotation direction length D of the entire surface of the heat seal blade.

Further, the present invention is attached to at least one of a pair of rolls that are disposed in parallel and close to each other and are driven to rotate in opposite directions so as to extend in the axial direction, and the surface thereof is A heat-sealing blade for a heat-sealing roll, which has an arc shape along the circumferential direction of the roll, and sandwiches the laminated film for packaging between the opposed films and fusion-bonds the laminated film,
When at least one part on the side preceding the rotational direction of the surface of the heat seal blade is a recessed bottle mouth-shaped seal blade, it hits the seal of at least one bottle mouth convex portion of the opposed seal blade. The present invention proposes a heat seal blade for a heat seal roll, characterized in that the entire portion excluding the end portion on the side preceding the rotation direction (preceding side end portion) becomes a fine uneven rough surface portion.

  In addition, in this invention, the recessed part depth of the said uneven rough surface part is 1-30 micrometers, the uneven | corrugated average space | interval Sm of the said uneven rough surface part is 15-300 micrometers, and / or uneven | corrugated arithmetic average roughness Ra is 0. 0.5 to 5.0 μm, the uneven rough surface portion is a striped rough surface parallel to the axial direction, and the uneven rough surface portion gradually has a roughness Ra toward the center, or It is preferable that the surface is a gradation rough surface roughened in an inclined manner toward the side preceding the rotation direction or the subsequent side.

  Further, the present invention proposes a heat seal roll in which one or more of the heat seal blades are detachably disposed on the same peripheral surface of the roll body in the state of extending in the axial direction thereof. To do.

  Moreover, this invention proposes the heat seal roll formed by extending the said heat seal blade in the rotation axis direction of the roll.

  According to the heat sealing blade for heat sealing of the present invention, by forming the rough surface with various patterns only on the central portion where foaming is likely to occur, of at least one surface of the pair of heat sealing blades, Effectively control how heat is transferred from the sealing blade to the packaging film, so that foaming from the inside of the seal is suppressed, the allowable temperature range of the seal is widened, and productivity can be increased. Thus, stable and reliable fusion bonding is always possible.

  FIG. 1 illustrates a horizontal sealing roll as an embodiment of the heat sealing roll of the present invention. In the figure, reference numeral 1 denotes a pair of rolls that are arranged in parallel to each other and are driven to rotate in opposite directions, and 2 is attached to each roll 1 and under a radially outward projection. A heat seal blade extending in the axial direction of the roll 1 and having a surface arcing in the circumferential direction of the roll 1, here, a horizontal seal is shown. In FIG. 1A, the rough surface portion 4 is formed on the heat seal blade 2 extending on one of the pair of rolls 1, and FIG. An uneven rough surface portion 4 is formed on a heat seal blade 2 extending on each roll 1.

  One or more horizontal sealing blades 2 of each heat seal roll 3 are arranged on the roll 1, and many of them are arranged at equal intervals in the circumferential direction thereof. Each of the horizontal sealing blades 2 of the pair of heat seal rolls 3 holds the packaging film in cooperation with each other under the synchronized rotational movement of the heat seal rolls 3, and seals the film. A lateral seal portion is formed by fusing and bonding the layers.

  In such a heat seal roll 3 that forms a pair, preferably, a flange 5 that protrudes somewhat in the radial direction from the surface of the horizontal seal blade 2 is provided at each axial end portion of each roll 1 to form a pair. 3, a predetermined clamping clearance with respect to the packaging film is reliably ensured between the horizontal sealing blades 2 that have reached the heat sealing positions with each other under the contact of the peripheral surfaces of the flanges.

  When the heat seal roll 3 configured as described above is applied to the automatic filling and packaging apparatus as a horizontal seal roll, and a foreign matter is sealed with the horizontal seal roll, the packaging film is wound. The film that has been continuously fed out from the roll is folded in half in the width direction by the folding means so that the sealant layer is opposed to each other. Heat seal is applied to form a vertical seal part in which the sealant layer is fusion-bonded in the length direction of the film, and then the package is continuously connected to the inside of the film subjected to the vertical seal via a filling nozzle. Then, as shown in FIG. 6, a pair of heat seal rolls 111 as horizontal seal rolls, directly packaged by horizontal seal blades 112. The film, to form a transverse seal portion 115 at predetermined intervals of it in the longitudinal direction. According to this, the packaging bag which filled and packaged the predetermined amount of to-be-packaged goods will be manufactured continuously.

  In the present invention, as illustrated in the heat seal blade 2 for heat seal rolls in FIGS. 1 and 2, at least one arcuate surface of the horizontal seal blade 2 is on the end 7a ( Hereinafter, a shot blast, sand blast, grit blast or the like or a magnet is provided in the central portion 8 excluding the leading end 7a and the trailing end 7b (hereinafter referred to as the trailing end 7b). The fine uneven rough surface portion 4 is formed by a roughening method such as a grinder or liquid honing.

  As described above, in order to suppress the occurrence of foaming in the heat seal portion as described above, it is proposed to form a rough surface on the entire surface of the horizontal seal blade 112 to reduce the contact area with the packaging film. However, since the surface temperature and the sealing pressure of the edge portion and the central portion of the horizontal sealing blade 112 differ depending on the difference in the contact area with the heat radiation and the packaging film, the sealing blade edge having a low surface temperature is used in the prior art method. The amount of heat transferred from the part to the packaging film becomes too small, and there is a risk of causing poor sealing such as unsealing of the film. Therefore, in the present invention, at least one of the pair of heat seal blades 2 has a leading end 7a and a trailing side having a high sealing pressure and a low surface temperature (foaming is difficult) of the arcuate surface. The end portion 7b is a smooth surface, the center portion 8 having a low sealing pressure and a high surface temperature (foaming is likely to occur) is a fine uneven rough surface portion.

  When the heat seal blade 2 for heat seal roll is used as a horizontal seal blade, the horizontal seal blade 2 is rotationally displaced from the position indicated by the phantom line to the heat seal position indicated by the solid line in FIG. Even if it comes into contact with the packaging film under a relatively small pressing force, the central portion 8 comes into contact with the packaging film 6 only by the convex portion, and the contact area between the two becomes considerably small. The amount of heat transferred from 2 to the packaging film 6 and the packaged object inside thereof can be kept sufficiently small.

  Moreover, this reduction in the amount of heat transferred does not unnecessarily heat the article to be packaged even when the heating temperature of the horizontal seal blade 2 is increased, and therefore the possibility of alteration of the article to be packaged is sufficiently removed. At the same time, it is also effective that the sealant layer of the packaging film 6 has an early risk of residual wrapping of the packaged product and foaming due to a decrease in viscosity due to excessive melting. Can be removed.

  Moreover, in the present invention, since the rough side surface is not formed on the leading side end 7a and the trailing side end 7b whose surface temperature is lower than that of the central portion 8 in the horizontal seal blade 2, the unevenness rough surface is not formed from the ends 7a, 7b. The amount of heat transferred to the packaging film 6 is kept high, the lower limit of the allowable seal temperature can be set to a lower temperature than the prior art, productivity can be improved, and the film is not fused. Thus, there is no possibility of causing a sealing failure, and stable and reliable fusion bonding can be performed at all times.

  Therefore, according to the horizontal sealing blade 2 of the present invention, the temperature of the horizontal sealing blade 2 can be made sufficiently uniform over the whole regardless of whether the timing of contact with the packaging film 6 is early or late.・ High-speed filling of the package, in other words, the contact time between the horizontal sealing blade 2 and the packaging film 6 is shortened and the allowable seal temperature is increased, and foaming does not occur. It becomes possible to perform fusion bonding.

Moreover, when the uneven | corrugated rough surface part 4 was formed in the center part 8 of the horizontal seal blade which makes a pair, when the horizontal seal blade 2 reached the heat seal position shown by the solid line in FIG. The convex portion on the surface of the central portion 8 is sufficiently pressed into the film under compressive deformation in the thickness direction of the packaging film 6, so that the rough surface portion 4 of the horizontal seal blade 2 is convex. A large amount of heat is rapidly supplied from the horizontal sealing blade 2 to the packaging film 6 under the large contact area of the packaging film 6 over the whole, regardless of whether or not the concave portion is formed. Therefore, the sealant layer of the packaging film 6 can be melted to the extent necessary for fusion bonding, so that the article to be packaged is properly displaced from both sealant layers, and the horizontal seal as expected. The part can always be formed reliably.
Since the leading end 7a and the trailing end 7b of the horizontal seal blade 2 are smooth surfaces, the contact area with the packaging film 6 is larger than that of the prior art. Since the row side end portion 7b has a lower surface temperature and a smaller area than the central portion 8, the contact between the leading side end portion 7a and the trailing side end portion 7b and the packaging film 6 causes There is no problem because it is not heated to such an extent that the quality is impaired or the viscosity of the sealant layer of the packaging film 6 is lowered too much.

  In addition, it is preferable that the said center part 8 is the range whose rotation direction length d is set to d / D = 0.3-0.95 with respect to the rotation direction length D of the heat seal blade 2 whole surface. . When d / D is smaller than 0.3, the uneven rough surface portion 4 is too small to obtain the effect of suppressing the amount of heat transferred to the packaging film 6, and the sealant layer of the packaging film 6 and the packaged object are unnecessary. On the other hand, if d / D is larger than 0.95, the sealing temperature at the leading end 7a and the trailing end 7b becomes too low to be sufficiently fused, There is a risk of failure.

  Next, FIG. 3 shows a bottle-shaped sealing blade 2 ′ having a shape in which one or more upper portions in the rotational direction of the heat sealing blade are recessed as another embodiment of the present invention. An uneven rough surface portion 4 ′ is formed on the entire portion 9 excluding the leading end portion 7 a. Since the uneven rough surface portion 4 'has a higher pressure than the other portions, if heat sealing is performed under the same conditions, the sealing pressure becomes too high, and the sealing portion is wrinkled or the film is cut. There is a risk of leakage. Therefore, in the present invention, only the high-pressure portion is made the rough surface portion 4 ′, and the seal temperature is made lower than the other portions, so that an optimum seal state is made.

  In addition, in this heat seal blade 2, 2 ', it is preferable that the average space | interval Sm prescribed | regulated by JIS B0601 of the uneven | corrugated rough surface 4 shall be 15-300 micrometers, and by making it into this range, the heated seal blade 2, The contact area between the sealing blades 2 and 2 ′ and the packaging film 6 until 2 ′ reaches the heat sealing position can be sufficiently reduced. On the other hand, if the unevenness average interval Sm exceeds 300 μm, the packaging film 6 comes into contact with the sealing blades 2 and 2 ′ at portions other than the convex portions, and there is a concern that the contact area between them is increased.

  Moreover, it is preferable that the depth of a recessed part shall be the range of 1-30 micrometers. If the depth of the recess is less than 1 μm, there is a high risk that the recess of the seal blade 2, 2 ′ will come into contact with the packaging film 6 before the seal blade 2, 2 ′ reaches the heat seal position. If it exceeds, the sealing blades 2 and 2 ′ reach the heat sealing position, and the holding force of the packaging film by the sealing blades 2 and 2 ′ is increased. There is a possibility that the contact area between the surface of the sealing blade and the packaging film 6 cannot be sufficiently increased due to the insufficient contact.

  Moreover, it is preferable to make arithmetic mean roughness Ra prescribed | regulated by JIS B0601 of the said uneven | corrugated rough surface part 4 into the range of 0.5-5.0 micrometers, When reaching a heat seal position by setting it as this range Even if the contact pressure (pressing force) of the sealing blades 2 and 2 'is weak, the recesses of the sealing blades 2 and 2' are in contact with the packaging film 6 sufficiently uniformly and heat is transferred, so that the stability is extremely stable. High speed filling of heat seal is possible.

  In the present invention, the uneven rough surface portion 4 formed in the seal blade central portion 8 has different ways of transferring heat from the seal blades 2 and 2 'to the packaging film 6 depending on the roughness and pattern. It is preferable to change the roughness and pattern of the rough surface portion 4 depending on the type of the surface.

  For example, as shown in FIG. 4A, when the uneven rough surface portion 4 is formed in the entire seal blade center portion 8, heat transfer from the seal blade center portion 8 can be reduced as a whole. In addition, as a packaged item, liquids and mucilage in general can be applied.

  In addition, when a rough surface is formed in a stripe shape in the roll circumferential direction as shown in FIG. 4B, the heat transfer from the seal blade central portion 8 to the packaging film 6 can be intermittently changed. The sealing temperature can be controlled within the same sealing blade 2, 2 '. That is, when the uneven rough surface portion 4 is continuously formed on the entire seal blade central portion 8, if the uneven rough surface portion 4 exceeds a certain roughness, it cannot be completely welded during heat sealing, and the seal portion may peel off. When the uneven rough surface portion 4 is formed in a stripe shape, heat is intermittently supplied from the sealing blades 2, 2 'to the packaging film 6, so that the seal portion may peel off even when the rough surface portion 4 has the same roughness as described above. Can be lowered. Moreover, as a packaged object, it can be used for the whole liquid and mucilage, and can also be used as a wide seal.

  Further, as shown in FIG. 4C, the surface roughness Ra of the seal blade central portion 8 is gradually roughened toward the center or toward the end on the side preceding the rotation direction in a gradation. It is preferable. When the rough surface is formed in such a gradation, the transfer of heat from the seal plate central portion 8 to the packaging film 6 can be reduced in an inclined manner, so that the seal temperature is controlled within the same seal blade 2, 2 ′. be able to. For this reason, for example, since foaming can be suppressed in a sloped or stepwise manner with respect to a place or region where foaming is likely to occur, it can be used for a packaged object containing solid matter in addition to the entire liquid or viscous material. Can do.

  In addition, in the heat sealing blade for heat sealing of the present invention, a rough surface may be formed on the surface of the central portion 8 in a grid shape, a mesh shape, a horizontal shape, or a vertical wave shape.

Example 1
Comparative example 1 using the heat seal roll of the example using the horizontal seal blade according to the present invention in which the arc-shaped surface is a fine uneven rough surface and the horizontal seal blade having an uneven rough surface formed on the entire surface of the heat seal blade And a heat seal roll of Comparative Example 2 using a horizontal seal blade having an arcuate surface as a smooth mirror surface, respectively, a biaxially stretched nylon base film having a thickness of 15 μm and a linear low density polyethylene sealant having a thickness of 50 μm. A packing film of 63 mm in length and 75 mm in width having a laminated structure with layers was filled with water at different filling speeds, and the sealing temperature at which water could be filled (sealing allowable temperature) was measured. The water temperature was 30 ° C., and the filling amount was 16 g. The results are shown in Table 1.

  The uneven surface of the horizontal seal blade of Example and Comparative Example 1 is roughened at the same time as blast material is sprayed on the surface of the material using compressed air flow, centrifugal force or the like to remove oxide or deposits on the surface. The roughness of the arithmetic average roughness Ra specified by JIS B0601 was 1.3 μm as measured by using a stylus roughness measurement method.

From the results shown in Table 1, in the heat seal roll of the example, the amount of heat supplied to the packaging film at the end portion was determined by making the leading and trailing end portions of the horizontal seal blade smooth. Therefore, the lower limit value of the allowable seal temperature could be lowered, and the allowable seal temperature range as the filling performance could be widened.
Moreover, in the heat seal roll of an Example, the uneven | corrugated rough surface was formed in the center part of a horizontal seal blade, and a to-be-packaged object and the film for packaging are not heated unnecessarily, but a seal higher than Comparative Example 2 Heat sealing was possible without causing foaming to an allowable temperature, and the allowable temperature range for sealing could be expanded.
Therefore, according to the heat seal roll of the embodiment, in addition to the operating factors such as the heating temperature and liquid temperature of the horizontal seal blade, the temperature seal and other environmental factors are effectively absorbed, and the horizontal seal portion as expected. Can be formed.

  Further, as shown in FIG. 5, when the sealing portions of the packaging film of Example and Comparative Example 2 heat-sealed at 195 ° C. were observed, the sealing portion of the Example was in a good state without foaming or wrinkles. On the other hand, in Comparative Example 2, the seal part had foam and wrinkles, and the appearance was poor.

  The heat seal blade for a heat seal roll of the present invention and the heat seal roll using the same are applied to a packaging apparatus for automatically filling a film for packaging liquid or mucilage.

A pair of heat seal rolls using an embodiment of the heat seal blade according to the present invention, (a) a heat seal blade extending on one roll formed with a rough surface portion (b) on each roll It is a perspective view which shows what formed the uneven | corrugated rough surface part in the extended heat seal blade. It is a perspective view which shows one Example of the heat seal blade which concerns on this invention. It is a perspective view which shows one Example of the bottle-mouth-shaped heat seal blade which concerns on this invention. It is a top view which shows the uneven | corrugated rough surface pattern of the heat seal blade which concerns on this invention. 2 is a photograph showing the appearance of heat seal portions of an example and a comparative example in Example 1. It is a basic line longitudinal cross-sectional view which shows the function of the horizontal seal roll of an automatic filling packaging apparatus. It is an expanded longitudinal cross-sectional view which shows the pinching remaining state of the to-be-packaged item in a horizontal seal part.

Explanation of symbols

1 roll 2 heat seal blade (horizontal seal blade)
2 'bottle mouth heat seal blade 3 heat seal roll 4, 4' uneven rough surface portion 5 flange 6 packaging film 7 heat seal blade end portion 7a leading side end portion 7b trailing side end portion 8 seal blade center portion 9 bottle mouth convexity Part

Claims (8)

It is attached to each of a pair of rolls that are arranged opposite to each other in parallel and are driven to rotate in the opposite directions so as to extend in the axial direction, and the surface thereof extends along the circumferential direction of the rolls. A heat sealing blade for a heat seal roll, which is arcuate and has a laminated film for packaging sandwiched between the opposing films and fusion-bonded to the laminated film,
Of the at least one surface of the opposing heat seal blade, only the central portion excluding the end portion on the side that comes into contact with the seal and the end portion on the following side becomes a fine uneven rough surface portion. A heat seal blade for a heat seal roll.   The rotation direction length d of the central portion is d / D = 0.3 to 0.95 with respect to the rotation direction length D of the entire surface of the heat seal blade. Heat seal blade for heat seal roll. It is attached to each of a pair of rolls that are arranged opposite to each other in parallel and are driven to rotate in the opposite directions so as to extend in the axial direction, and the surface thereof extends along the circumferential direction of the rolls. A heat sealing blade for a heat seal roll, which is arcuate and has a laminated film for packaging sandwiched between the opposing films and fusion-bonded to the laminated film,
When at least one part on the side preceding the rotational direction of the surface of the heat seal blade is a recessed bottle mouth-shaped seal blade, it hits the seal of at least one bottle mouth convex portion of the opposed seal blade. A heat seal blade for a heat seal roll, characterized in that the entire surface excluding the end portion on the side preceding the rotation direction is a fine uneven rough surface portion.   The heat seal blade for a heat seal roll according to any one of claims 1 to 3, wherein a concave portion depth of the rough surface portion is 1 to 30 µm.   5. The unevenness average surface roughness Sm of the unevenness rough surface portion is in the range of 15 to 300 μm and / or the unevenness arithmetic average roughness Ra is in the range of 0.5 to 5.0 μm. The sealing blade for heat seal rolls as described in the item.   The sealing blade for a heat seal roll according to any one of claims 1 to 5, wherein the uneven rough surface portion is a striped rough surface parallel to the axial direction.   The uneven rough surface portion is a gradation rough surface whose roughness Ra is gradually roughened toward the center, or inclined toward the side preceding the rotation direction or toward the subsequent side. The heat seal blade for a heat seal roll according to any one of claims 1 to 6.   A heat formed by detachably disposing one or a plurality of the heat seal blades according to any one of claims 1 to 7 on the same peripheral surface of the roll body in the axial direction thereof. Seal roll.

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