JP4758220B2 - Heat seal blade for heat seal roll and heat seal roll using the same - Google Patents

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 roll 111 is rotationally displaced from the position shown by a virtual line in FIG. 6 to the opposing position (seal position) shown by a continuous line, and adjoins in that position. 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 unfusion 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) Heat seal blades for heat seal rolls, in particular horizontal seal blades and heat using the same, which can spread stable and reliable fusion bonding under high-speed filling of the package It is to provide a seal roll .
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, in particular, a horizontal seal blade and a heat seal roll using the same .

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, the surface forms a continuous arc shape along the circumferential direction of the roll, and the laminated film is sandwiched between these facing films A heat seal blade for heat seal rolls for fusing and bonding films,
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 only the central portion, and a fine uneven rough surface, the rotational direction length d of the central portion, with respect to the rotation direction length D of the entire heat seal blade surface, and d / D = 0.3 to 0.95 In addition, the uneven rough surface portion is a gradation rough surface whose roughness Ra is roughened in an inclined manner toward the side preceding the rotation direction or the side following the rotation direction . A heat seal blade is proposed.

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

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

  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.

Figure 1 is a lateral sealing rolls as an embodiment of the heat seal roll of the present invention have been illustrated. 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 that extends in the axial direction of the roll 1 and whose surface has an arc shape continuous in the circumferential direction of the roll 1, here, a horizontal seal blade 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 both heat seal blades 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 continuous arcuate surface of the horizontal seal blade 2 is the end portion on the side preceding the rotational direction. Shot blasting, sand blasting, grit blasting, etc. in the central portion 8 excluding the end 7a (hereinafter referred to as the leading end 7a) and the trailing end 7b (hereinafter referred to as the trailing end 7b) Alternatively, the fine uneven surface portion 4 is formed by a surface roughening method such as a magnet grinder or liquid honing.

As described above, in the prior art, in order to suppress the occurrence of foaming in the heat-sealed portion, that the entire surface of the lateral sealing blade 112 to form an uneven rough surface to reduce the contact area between the packaging film While the proposed, the surface temperature and the sealing pressure between the edge portions and the central portion of the horizontal sealing blades 112, because it varies depending on the difference of the contact area between the heat dissipation and packaging film, in the conventional technology, low surface temperature The amount of heat transferred from the edge of the sealing blade to the packaging film becomes too small, and there is a risk of causing a sealing failure such as unsealing of the film. Therefore, in this embodiment , at least one of the pair of heat seal blades 2 has an arcuate surface with a high sealing pressure and a low surface temperature (foaming is difficult) and a leading side end 7a and a trailing side. The side end portion 7b is a smooth surface, the central 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 this embodiment , 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, from the ends 7a and 7b, the transfer heat to the packaging film 6, Runode maintained remain high, the lower limit of the seal allowable temperature than the prior art can be set to the low temperature side, it is possible to increase the productivity, the film There is no risk of sealing failure such as non-fusion, and stable and reliable fusion bonding can be performed at all times.

Therefore, according to the horizontal sealing blade 2 of the present embodiment , the temperature of the horizontal sealing blade 2 can be made sufficiently uniform throughout the entire time 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, 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 and is always stable. A reliable fusion bonding can be performed.

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.

Incidentally, the central portion 8, the rotational direction length d is, with respect to the rotation direction length D of the whole heat-sealed edge 2 surface shall be the range of the d / D = 0.3 to 0.95. 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, there is shown a heat Toshiru rotation direction leading portion of one part or bottle mouth shape seal blade 2 consisting of a shape recessed blades' leading end of its bottle mouth protrusions 9 An uneven rough surface portion 4 ′ is formed on the entire surface excluding the portion 7 a. The uneven rough surface portion 4 ', as compared with other parts, because the surface pressure during working becomes high, when the heat-sealing under the same conditions without uneven rough surface, the sealing pressure becomes too high, the seal There is a risk of wrinkles on the part, or the film may be cut and liquid leakage may occur. Therefore, only the portion where the seal pressure is excessively high is used as the uneven rough surface portion 4 ′, and the seal temperature is made relatively lower than the other portions, so that an optimum seal state is created.

  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.

However, uneven rough surface portion 4, 4 to form a sheet Lumpur blade central portion 8 or bottle mouth portion 9 'is sealed blade 2,2 by its roughness and pattern' transferred way of heat to the packaging film 6 is different Therefore, it is preferable to change the roughness and pattern of the rough surface portions 4 and 4 ′ depending on the type of the object to be packaged.

For example, as shown in FIG. 4A, when the uneven rough surface portion 4 is formed on the entire seal blade center portion 8 or the like, the transfer of heat from the seal blade center portion 8 can be reduced as a whole. . As the packaged articles, it is possible to apply the liquid or viscous material in general.

Further, when a rough surface is formed in a striped shape in the roll circumferential direction as shown in FIG. 4B, heat transfer from the seal blade center portion 8 or the like to the packaging film 6 can be changed intermittently. The sealing temperature can be controlled within the same sealing blade 2, 2 '. That is, when forming a continuously uneven rough surface portion 4 across such seal cutting the central portion 8, at a higher roughness is uneven rough surface portion 4, can not be completely welded during heat sealing, there is a possibility that the seal portion is peeled off but when the uneven rough surface portion 4 in stripes, for intermittently heat from the sealing edge 2,2 'to the packaging film 6 is supplied, the rough surface portion 4 is a fear of peeling the sealing portion in the same roughness as the Can be lowered. Further, as the packaged articles can be used in the entire liquid or viscous substance it 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 or the like gradually becomes rough in a gradation shape toward the center or toward the end on the side preceding the rotation direction. It is preferable. When the rough surface is formed in such a gradation, the transfer of heat from the seal blade central portion 8 or the like 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 '. can do. As a result , for example, foaming can be suppressed in a stepwise or stepwise manner with respect to easily foaming portions or regions, and used for a packaged object containing solid matter in addition to the entire liquid or viscous material. be able to.

  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.

Heat seal blade and a heat seal roll of the present invention, the heat seal roll using the same is applied to the packaging apparatus for automatically filling and liquid or viscous material to the packaging film.

Of a pair of heat seal rolls using 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) heat extending on each roll It is a perspective view which shows what formed the uneven | corrugated rough surface part in the sealing blade. Is a plan view showing an embodiment of a heat seal blade according to the present invention. It is a perspective view which shows one Example of a bottle- mouth-shaped heat seal blade. It is a top view which illustrates the uneven rough surface pattern of the heat seal blade concerning the present 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 (2)

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 forms a continuous arc shape and sandwiches the laminated film for packaging between these facing members and fusion-bonds the laminated film,
Of the at least one surface of the opposed heat seal blade, only the center portion excluding the end portion on the side that comes into contact with the seal in the rotational direction and the end portion on the following side is a fine uneven rough surface portion, and the center The rotational direction length d of the part is set to d / D = 0.3 to 0.95 with respect to the rotational direction length D of the entire surface of the heat seal blade, and the rough surface portion has a roughness Ra. A heat-sealing blade for a heat-sealing roll, characterized by a gradation-like rough surface roughened in an inclined manner toward the side preceding the rotation direction or the side following . A heat seal roll, wherein one or more of the heat seal blades according to claim 1 are detachably disposed on the peripheral surface of the roll body in a state of extending in the axial direction thereof.

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