JP2010228818A - Bottle opening-shaped heat seal blade for heat sealing roll and heat sealing roll using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To widen a seal temperature range capable of filling up a packaged object by controlling generation of foaming and wrinkles at a sealing section by effectively restraining heat transfer from a heat seal blade to the packaged object and a sealant layer for mutual proximity displacement of the paired heat seal blade, and to attain stable and certain fusion welding under high-speed filling of the packaged object. <P>SOLUTION: In the heat seal blade for a heat sealing roll wherein the heat seal blades are respectively mounted on a pair of rolls reversely rotated and driven by approaching each other and the surface of the heat seal blade is arced along the circumferential direction of the roll and laminated films are fusion-welded by holding the laminated films for packaging between these heat seal blades faced each other, according to the bottle opening-shaped seal blade where at least a part of a preceding side in the rotation direction of the surface of heat seal blade is hollow, a high-pressure section only, excluding an end part at an advancing side in the rotation direction by coming in contact with a seal among at least one bottle-opening projecting section of the opposite seal blades is set up to be a fine uneven rough surface section. <P>COPYRIGHT: (C)2011,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 bottle-shaped heat seal blade for a heat seal roll used as a horizontal seal blade and a heat seal roll using the same.

  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 with a mirror finish, and is 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 horizontal sealing method, the contact area between the packaging film 113 and the horizontal 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. 5, while the material 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 may cause excessive melting at an early stage, thereby causing the sealant layer to melt. There is a risk of lowering the viscosity. The 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 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.

  In particular, in the bottle-shaped heat seal blade in which at least a part on the side preceding the rotational direction of the surface of the heat seal blade has a concave shape, the convex portion of the bottle mouth on the side preceding the rotational direction upon sealing. Since the part excluding the end part is at a higher pressure than other parts, if heat sealing is performed under the same conditions, the sealing pressure of that part becomes too high, and the seal part is wrinkled or film There was a problem that the liquid was cut off and liquid leakage occurred.

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. Seal temperature range (hereinafter referred to as allowable seal temperature) that can be filled with the package by effectively suppressing the heat transfer from the seal blade to the package and the sealant layer to suppress foaming and wrinkles at the seal part. Providing a bottle-shaped heat-sealing blade for heat-sealing rolls, especially a horizontal-sealing blade, capable of widening the width and enabling stable and reliable fusion bonding under high-speed filling of packages. There is to do.
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. It is an object of the present invention to provide a bottle-shaped heat seal blade for a heat seal roll, in particular, 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,
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 bottle-shaped heat-sealing blade for a heat-sealing roll, characterized in that only the high-pressure portion excluding the end portion on the side preceding the rotation direction (preceding-side end portion) is 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.

  According to the bottle-shaped heat sealing blade for heat sealing of the present invention, the rough surface is formed in various patterns only on the central portion where foaming is likely to occur, among at least one surface of the pair of heat sealing blades. Therefore, it is possible to effectively control how heat is transferred from the heat seal blade to the packaging film, so that the occurrence of foaming from within the seal portion is suppressed, the allowable temperature range of the seal is widened, and the productivity can be increased. By using only the high-pressure part as an uneven rough surface part and lowering the sealing temperature than other parts, the sealing part will not be wrinkled or the film will not be cut. Is possible.

Of a pair of heat seal rolls using heat seal blades, (a) An uneven surface portion formed on a heat seal blade extending on one roll (b) Irregularities on a heat seal blade extending on each roll It is a perspective view which shows what formed the rough surface part. 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.

  FIG. 1 illustrates a horizontal seal roll as an example of a heat seal roll. 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, which 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, and then a longitudinal seal roll is continuously applied to the free end portion of the folded film. 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.

  By the way, this invention proposes about the bottle-shaped heat seal blade arrange | positioned on the surrounding surface of the heat seal roll of FIG. 1, and as illustrated in FIG. 2, the rotation direction upper part of heat seal blade 2 'is shown. The concave and convex rough surface portion 4 is formed on the entire portion of the bottle mouth convex portion 9 excluding the leading end portion 7a. Since the formation portion of the rough surface portion 4 is higher 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 film There is a risk of leakage and liquid leakage. Therefore, in the present invention, only the high-pressure portion is the rough surface portion 4 and the sealing temperature is made lower than that of the other portions, so that an optimum sealing state is created. The uneven rough surface portion 4 is formed by a surface roughening method such as shot blasting, sand blasting, grit blasting or the like, or a magnet 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, the front side end 7a having a low surface temperature (not easily foamed) of the surface of the bottle mouth convex portion 9 of at least one of the pair of bottle mouth heat seal blades 2 ′ is a smooth surface. In addition, the portion having a high sealing pressure and a high surface temperature (foaming is likely to occur) is the fine uneven rough surface portion 4.

  When the bottle-shaped 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 in FIG. 5 to the heat seal position indicated by the solid line. In the meantime, 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. Therefore, the amount of heat transferred from the horizontal seal blade 2 'to the packaging film 6 and the packaged object inside the packaging film 6 can be sufficiently reduced.

  Further, 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, there is a sufficient risk of alteration of the article to be packaged. At the same time, there is also a risk of the wrapping remaining in the side seal portion and the occurrence of foaming due to a decrease in viscosity due to excessive melting of the sealant layer of the packaging film 6 at an early stage. It can be removed effectively.

  And in this invention, since the uneven | corrugated rough surface is not formed in the front side edge part 7a with low surface temperature in the bottle-shaped side seal blade 2 ', the amount of heat transferred from the edge part 7a to the packaging film 6 is high. The lower limit of the allowable seal temperature can be set to a lower temperature than the prior art, and the productivity can be increased, and there is no risk of poor sealing such as film non-bonding. Stable and reliable fusion bonding can be performed.

  Therefore, according to the bottle-mouth-shaped 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. As a result, high-speed filling of the article to be packaged, in other words, shortening the contact time between the horizontal sealing blade 2 ′ and the packaging film 6 and expanding the allowable seal temperature, foaming does not occur, It becomes possible to always perform stable and reliable fusion bonding.

Further, when the uneven rough surface portion 4 is formed on the bottle convex portion 9 of the paired bottle-shaped horizontal seal blade 2 ′, when the horizontal seal blade 2 ′ reaches the heat seal position indicated by the solid line in FIG. The packaging film 6 is sandwiched with a large pressing force, and the convex portion on the surface of the bottle mouth convex portion 9 is sufficiently pushed into the film under compression deformation in the thickness direction of the packaging film 6, whereby the horizontal sealing blade The 2 'uneven rough surface portion 4 closely adheres to the packaging film 6 over the entire surface, regardless of the convex and concave portions, and a large amount from the side seal blade 2' to the packaging film 6 under the large contact area between the two. The amount of heat is quickly supplied. 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.
In addition, since the leading side end 7a of the bottle mouth convex part 9 is a smooth surface, the contact area with the packaging film 6 is larger than that of the prior art, but the surface temperature of the leading side end 7a is low and the area is large. Since it is small, the contact between the leading end 7a and the packaging film 6 does not cause the quality of the article to be packaged to deteriorate, or the viscosity of the sealant layer of the packaging film 6 is not excessively lowered. There is no.

  In addition, in this heat seal blade 2 ′, it is preferable that the average interval Sm defined by JIS B0601 of the rough surface 4 is 15 to 300 μm. By making this range, the heated seal blade 2 ′ The contact area between the sealing blade 2 ′ and the packaging film 6 until the heat sealing position is reached can be sufficiently reduced. On the other hand, when the unevenness average interval Sm exceeds 300 μm, the packaging film 6 comes into contact with the sealing blade 2 ′ even at portions other than the convex portions, and there is a possibility that the contact area between the two becomes large.

  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 possibility that the recess of the seal blade 2 ′ will come into contact with the packaging film 6 before the seal blade 2 ′ reaches the heat seal position. The blade 2 'reaches the heat sealing position, and the holding force of the packaging film by the sealing blade 2' is increased. However, the concave portion of the sealing blade 2 'cannot sufficiently contact the packaging film 6, and the surface of the sealing blade There is a possibility that the contact area between the film 6 and the packaging film 6 cannot be sufficiently increased.

  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 blade 2 ′ is weak, the concave portion of the sealing blade 2 ′ is in contact with the packaging film 6 sufficiently uniformly and heat is transferred, so that the heat transfer speed is extremely stable. Filling becomes possible.

  Further, in the present invention, the uneven rough surface portion 4 formed on the bottle mouth convex portion 9 of the sealing blade differs in how heat is transmitted from the sealing blade 2 'to the packaging film 6 depending on its roughness and pattern. It is preferable to change the roughness and pattern of the rough surface portion 4 depending on the type of the object.

  For example, as shown in FIG. 3A, when the uneven rough surface portion 4 is formed on the entire bottle mouth convex portion 9 of the sealing blade, the transfer of heat from the bottle mouth convex portion 9 may be reduced as a whole. it can. In addition, as a packaged item, liquids and mucilage in general can be applied.

  Moreover, when a rough surface is formed in a striped shape in the roll circumferential direction as shown in FIG. 3B, the transfer of heat from the sealing blade bottle mouth convex portion 9 to the packaging film 6 can be intermittently changed. Therefore, the sealing temperature can be controlled within the same sealing blade 2 ′. That is, when the uneven rough surface portion 4 is continuously formed on the entire seal blade bottle mouth convex portion 9, if the uneven rough surface portion 4 exceeds a certain roughness, the seal portion may not be completely welded at the time of heat sealing. However, since the heat is intermittently supplied from the sealing blade 2 'to the packaging film 6 when the uneven rough surface portion 4 is formed in a stripe shape, there is a possibility that the sealing portion may be peeled 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. 3 (c), the surface roughness Ra of the bottle mouth convex portion 9 of the sealing blade is gradually roughened toward the center or toward the end on the side preceding the rotation direction in a gradation. It is preferable that 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 can be controlled within the same seal blade 2 '. it can. 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, the rough surface may be formed in a grid-like shape, a mesh shape, a horizontal shape, or a vertical wave shape on the surface of the bottle mouth convex portion 9.

Example 1
The heat seal roll of the embodiment using the horizontal sealing blade according to the present invention, with the portion excluding the leading side end of the bottle mouth convex portion being a fine uneven rough surface, and the entire surface of the bottle mouth convex portion of the heat seal blade Using the heat seal roll of Comparative Example 1 using a horizontal seal blade having an uneven rough surface, and the heat seal roll of Comparative Example 2 using a horizontal seal blade with the arcuate surface of the bottle mouth convex portion as a smooth mirror surface, A packing film of length 63 mm x width 75 mm consisting of a laminated structure of a biaxially stretched nylon base film with a thickness of 15 μm and a linear low density polyethylene sealant layer with a thickness of 50 μm is filled with water at different filling speeds. The sealing temperature at which water can 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 in Table 1, in the heat seal roll of the example, the amount of heat supplied to the packaging film at the end portion of Comparative Example 1 was determined by making the leading side of the bottle mouth convex portion of the horizontal seal blade a smooth surface. Since the number of heat seal rolls can be increased, the lower limit value of the allowable seal temperature can be lowered, and the allowable seal temperature range as the filling performance can be widened.
In addition, the heat seal roll of the example can perform heat sealing without causing foaming up to a seal allowable temperature higher than that of Comparative Example 2 without unnecessarily heating an article to be packaged or a packaging film. The allowable temperature range of the seal 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.

  Moreover, as shown in FIG. 4, when the seal part of the packaging film of Example and Comparative Example 2 heat-sealed at 195 ° C. was observed, the seal part 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 bottle-shaped 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.

1 roll 2 heat seal blade (horizontal seal blade)
2 'bottle mouth shape heat seal blade 3 heat seal roll 4 uneven rough surface portion 5 flange 6 packaging film 7 heat seal blade edge portion 7a leading side edge portion 9 bottle mouth convex portion

Claims (6)

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 bottle-shaped heat-sealing blade for a heat-sealing roll, wherein only the high-pressure portion excluding the end portion on the side preceding the rotation direction is a fine uneven rough surface portion.   2. The bottle-mouth heat seal blade for heat seal roll according to claim 1, wherein a recess depth of the rough surface portion is 1 to 30 μm.   3. The heat according to claim 1, wherein the uneven surface roughness Sm of the uneven surface portion is in the range of 15 to 300 μm and / or the uneven arithmetic average roughness Ra is in the range of 0.5 to 5.0 μm. Bottle mouth heat seal blade for seal roll.   The bottle-shaped heat seal blade for a heat seal roll according to any one of claims 1 to 3, 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 bottle-shaped heat seal blade for heat seal rolls according to any one of claims 1 to 4.   One or more of the bottle-shaped heat seal blades according to any one of claims 1 to 5 are detachably arranged on the same peripheral surface of the roll body in a state of extending in the axial direction thereof. Heat seal roll.

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