JP5475390B2 - Heat sealing equipment - Google Patents

Description

  The present invention relates to a heat sealing apparatus that intermittently seals a belt-like processed sheet.

  Conventionally, heat source devices such as hot plate type, ultrasonic type, hot air type, impulse type, etc. have been known, and rotary (rotary type) and reciprocating type (reciprocating type) mechanisms are known as sealing device mechanisms. It has been. Furthermore, each of the rotary (rotary) and reciprocating (reciprocating) sealing device mechanisms has been devised to increase the sealing time. So-called box motion type mechanisms and variable speed type heat sealing devices are available. Proposed.

  For example, in Patent Document 1, control is performed so that the sealing time in one cycle of the box motion is relatively long with respect to the sealing distance of a fixed stroke in a state where the cycle time of the box motion is constant. A box motion type end seal (horizontal seal) cutting device is described.

  However, even in the box motion type sealing device described in Patent Document 1 that supplies a sufficient amount of heat, the sealing strength sometimes becomes unstable.

JP 2007-50934 A

  Accordingly, an object of the present invention is to provide a heat seal device in which the seal strength is unlikely to become unstable.

  The present invention is a heat seal device that feeds and passes a superposed belt-like processed sheet between a pair of opposing seal block bodies, and intermittently seals the processed sheet. Each of the seal block bodies has a pattern block fixed to the tip of the seal block body that seals the processed sheet, and a heater block that heats the pattern block inside the seal block body, The heater block is provided so as to be separable from the pattern block, the sheet to be processed is sandwiched and sealed by a pair of opposing pattern blocks, and each of the heater blocks of the pair of seal block bodies is sealed. Sometimes the heat shield is separated from the pattern block and comes into contact with the pattern block after sealing. There is provided Le device.

  According to the heat sealing apparatus of the present invention, the seal strength is unlikely to become unstable.

FIG. 1 is a diagram schematically showing an embodiment of a heat sealing apparatus of the present invention. FIG. 2 is a front view of a seal block body in the heat sealing apparatus shown in FIG. 3 is a cross-sectional view taken along line Y1-Y1 shown in FIG. FIG. 4 is a diagram for explaining a process of intermittently sealing a belt-like processed sheet using the heat sealing apparatus shown in FIG. FIG. 5 is a view schematically showing another embodiment of the heat sealing apparatus of the present invention. FIG. 6 is a front view of a seal block body in the heat sealing apparatus shown in FIG. 7 is a cross-sectional view taken along line Y2-Y2 shown in FIG. FIG. 8 is a diagram illustrating a process of intermittently sealing a belt-like processed sheet using the heat sealing apparatus shown in FIG.

  Hereinafter, the heat sealing apparatus of the present invention will be described based on the preferred first embodiment with reference to FIGS.

  As shown in FIG. 1, the heat sealing apparatus 1A of the first embodiment supplies and passes the overlapped strip-like processed sheet 2 between a pair of opposed seal block bodies 3 and 3 to form a strip-like workpiece. In this device, the processed sheet 2 is intermittently sealed to form a seal portion 20. In the seal portion 20, the overlapped belt-like processed sheets 2 are joined. The heat sealing device 1A sandwiches and seals the belt-like processed sheet 2 with a pair of opposed pattern blocks 4 and 4, and the heater blocks 5 of the pair of seal block bodies 3 are separated from the pattern block 4 at the time of sealing. However, it is formed so as to come into contact with the pattern block 4 again after sealing. In the following description, as shown in FIG. 1, the supply direction of the belt-like processed sheet 2 is the X direction, the width direction of the belt-like processed sheet 2 (the direction orthogonal to the supply direction) is the Z direction, The direction in which the seal block bodies 3 and 3 face each other will be described as the Y direction.

  Specifically, as shown in FIG. 1, the heat sealing apparatus 1 </ b> A according to the first embodiment includes a pair of rectangular parallelepiped moving bodies 10, 10, and the tip of each moving body 10 (a belt-like processed sheet in the Y direction). The seal block body 3 is provided at the tip of the side sandwiching 2. As shown in FIG. 2, each of the pair of seal block bodies 3, 3 includes a pattern block 4 fixed to the tip of the seal block body 3 that seals the belt-like processed sheet 2, and an inside of the seal block body 3. And a heater block 5 for heating the pattern block 4. Specifically, as shown in FIGS. 2 and 3, each seal block body 3 includes a pair of plates 56 and 56 that form a peripheral surface and an end plate 57 that forms a bottom surface. The pattern block 4 and the heater block 5 are held by 56 and 56 and the end plate 57.

  The pair of opposed moving bodies 10 and 10 can be moved in the Y direction by a piston cylinder (not shown), and the seal block bodies 3 and 3 arranged at the tips of the pair of moving bodies 10 and 10 are in a band shape. The belt-like processed sheet 2 is sandwiched between the belt-shaped processed sheet 2 and the belt-shaped processed sheet 2 is disposed in parallel with the belt-shaped processed sheet 2 in the X direction by a conveyor (not shown). Control of the operation of the moving body 10 (operation of the piston cylinder and the conveyor) is controlled according to a predetermined operation sequence by a control means (not shown) provided in the heat seal apparatus 1A. Thus, the heat sealing apparatus 1A of the first embodiment is a so-called box motion type sealing apparatus.

  As shown in FIG. 2, each of the pair of seal block bodies 3 has a rectangular shape when viewed from the front. As shown in FIGS. 2 and 3, a pattern block 4 that seals the belt-like work sheet 2 is fixed to each seal block body 3 at the tip of a pair of plates 56, 56. A heater block 5 for heating the pattern block 4 is provided inside the plates 56 and 56. The plate 56 of the seal block body 3 may be formed of a metal such as an aluminum alloy or steel, or may be formed of a heat resistant resin.

  As shown in FIG. 2, the pattern block 4 of each of the pair of seal block bodies 3 has a rectangular parallelepiped shape and is disposed and fixed across both ends in the longitudinal direction (Z direction) of the seal block body 3. . The width (length in the Z direction) (W1) of the pattern block 4 constituting the top surface of each seal block body 3 is longer than the width (length in the Z direction) (W0) of the belt-like processed sheet 2 From the viewpoint of lowering the temperature of both end portions in the Z direction when the pattern block 4 is heated, specifically, the width (W0) of the processed sheet 2 is reduced. The value (W1 / W0) of the width (W1) of the pattern block 4 with respect to () is preferably 1.3 times or more. The width (W1) of the pattern block 4 can be adjusted as appropriate according to the object to be sealed. For example, in the formation of a so-called side seal portion of a disposable diaper, the length of the pattern block 4 in the Z direction is 100 to 100. 300 mm, the length in the X direction is adjusted to 30 to 40 mm, and the thickness in the Y direction is adjusted to about 20 to 40 mm.

  In each pattern block 4 of the first embodiment, it is preferable to chamfer both corners in the X direction so as not to damage the belt-like processed sheet 2 at the corners as shown in FIG. . A heat seal pattern is applied to the tip of the pattern block 4, and the seal pattern is transferred to the belt-like processed sheet 2 at the time of sealing. Examples of the shape of the transferred seal pattern include a stripe shape and a dot shape. The heat seal pattern is applied to a region between a pair of through-holes 41, 41 described later at the tip of the pattern block 4, that is, a region in contact with the belt-like processed sheet 2. It is not applied to the outer region in the Z direction, that is, the region not in contact with the belt-like processed sheet 2. The pattern block 4 applies a pressure only to a region (seal pattern forming surface) that contacts the belt-like processed sheet 2 to uniform the temperature to some extent, and a region that does not contact the belt-shaped processed sheet 2 is strip-shaped. It is preferable to cut one step lower than the region (sealing pattern forming surface) that contacts the processed sheet 2. The pattern block 4 is formed of a metallic block such as an aluminum alloy or steel.

  In the first embodiment, the seal block body 3 has through holes 41 penetrating in the Y direction in each pattern block 4 of the seal block body 3 as shown in FIGS. In the first embodiment, the through hole 41 is formed in each pattern block 4 of the pair of seal block bodies 3 and 3 as shown in FIG. Further, as shown in FIG. 2, the through-hole 41 has through-holes 41 penetrating in the Y direction at both ends 4 a and 4 a in the Z direction of the pattern blocks 4 of the pair of seal block bodies 3 and 3. ing. The through hole 41 is formed at a position where the distance between the through holes 41 is longer than the width (W0) of the belt-like processed sheet 2. Moreover, each pattern block 4 of 1st Embodiment is provided with the temperature sensor 52 for adjusting the temperature of the heater 51 mentioned later, as shown in FIG. A cylindrical hole 42 for disposing 52 extends from one end 4a to the vicinity of the center in the longitudinal direction (Z direction). Note that the cylindrical hole 42 in which the temperature sensor 52 is disposed is preferably formed near the surface of the pattern block 4 from the viewpoint that the position of the temperature sensor 52 is preferably near the surface of the pattern block 4. It is good also as a through-hole extended over the both ends of a longitudinal direction (Z direction) similarly to the air port 43 to do.

  Each pattern block 4 may further include a cooling unit that lowers the temperature of the pattern block 4. As shown in FIGS. 2 and 3, each pattern block 4 of the first embodiment has an air port 43 extending across both ends in the longitudinal direction (Z direction) at a position that does not overlap the through-hole 41 and the hole 42. Is formed. In the first embodiment, as shown in FIG. 3, a through hole 41 is disposed between the hole 42 and the air port 43. The cooling means lowers the temperature of the pattern block 4 by blowing air through the penetrating air port 43 at an arbitrary timing.

  As shown in FIGS. 2 and 3, each heater block 5 of the present invention is provided so as to be separated from the pattern block 4. Each heater block 5 heats the pattern block 4, and each heater block 5 is provided with a heater 51 that heats the heater block 5, as shown in FIGS. It is provided so as to be separated from the pattern block 4. As shown in FIGS. 2 and 3, each heater block 5 of the first embodiment is provided with a protruding hook 53 that is movably inserted in each through-hole 41 of the pattern block 4, and on the opposite side of the protruding hook 53. And a spring 54 arranged. The heater block 5 is formed of a metallic block such as an aluminum alloy or steel.

  As shown in FIG. 2, the heater 51 of the first embodiment extends across both ends in the longitudinal direction (Z direction) of the heater block 5, and the two heaters 51, as shown in FIG. 3, They are juxtaposed at the center in the Y direction with a gap in the Y direction. As described above, in the first embodiment, the temperature sensor 52 for adjusting the temperature of the heater 51 is disposed inside the hole 42 of each pattern block 4.

  Examples of the heater 51 include a cartridge heater, a rubber heater, a plate heater, and the like, and a cartridge heater is preferably used from the viewpoint of long life and high power density. The heater 51 of 1st Embodiment is distribute | arranged to the through-hole opened in the heater block 5, as shown in FIG. From the viewpoint of making the temperature of the heater block 5 uniform, it is preferable that the heater block 5 is disposed across both ends in the Z direction.

  The protruding rod 53 of the first embodiment is a rod-like pin that is long in the Y direction. When the heater block 5 and the pattern block 4 are in contact with each other, the tip portion thereof is the seal pattern forming surface of the pattern block 4. Protruding from. In the protruding collar 53, the length of the portion protruding from the seal pattern forming surface is long enough to lower the surface temperature of the pattern block 4 when the heater block 5 and the pattern block 4 are separated from each other. Any adjustment may be made in consideration of conditions such as the thickness of the object, the welding temperature, and the sealing time. For example, the length of the protruding portion of the protruding collar 53 from the seal pattern forming surface is preferably longer than the thickness of the belt-like processed sheet 2 and is preferably 1 mm to 10 mm.

  As described above, since the distance between the through holes 41 of the pattern block 4 is formed at a position that is longer than the width (W0) of the belt-like processed sheet 2, it is inserted into the through hole 41. The protruding protrusion 53 does not contact the belt-like processed sheet 2. In the first embodiment, it is preferable that the protruding rod 53 provided on one heater block 5 and the protruding rod 53 provided on the other heater block 5 are arranged at positions that do not contact each other. . The reason is that there is a possibility that the timing of separating one heater block 5 may be delayed due to the influence of the balance of the spring 54, and the heater block 5 is also separated in each seal block body 3. This is because the timing may be shifted left and right, and the heater block 5 may tilt. Therefore, the protruding hook 53 provided in one heater block 5 and the protruding hook 53 provided in the other heater block 5 may be arranged at the same position in the X direction, but in the Z direction. Are preferably arranged at shifted positions.

  Examples of the material of the protrusion 53 include resins, metals such as steel and stainless steel, and a heat resistant resin having a low thermal conductivity can be preferably used from the viewpoint of heat conduction.

  As illustrated in FIG. 3, the spring 54 according to the first embodiment is disposed on the surface of the heater block 5 on the opposite side to the surface on which the protrusions 53 are disposed in the Y direction. One end of the spring 54 is fixed to the heater block 5, and the other end is fitted into a hole provided on the upper surface of the end plate 57 that forms the bottom surface of the seal block body 3. The hole on the upper surface of the end plate 57 is formed in a portion where the other end of the spring 54 abuts. As described above, the other end of the spring 54 is not fixed to the end plate 57, but is inserted into the hole because the spring 54 slides inside the hole when the heater block 5 and the pattern block 4 are separated from each other. This is to suppress the interference between the end plate 57 and the spring 54.

  In the heat sealing apparatus 1A of the first embodiment, when the projecting rod 53 is pushed during sealing, the heater block 5 and the pattern block 4 are separated from each other through the projecting rod against the elastic force of the spring 54. After the sealing, the heater block 5 and the pattern block 4 are again brought into contact with each other by the urging force of the spring 54.

  1 A of heat seal apparatuses are provided with the control means (not shown), this control means controls the operation | movement (operation | movement of a piston cylinder and a conveyor) of the moving body 10 mentioned above, and the heater distribute | arranged inside the heater block 5 The temperature control of 51 and the control of the timing of blowing air by the cooling means are controlled according to a predetermined operation sequence.

  Next, the operation of the heat sealing apparatus 1A that intermittently seals the belt-like processed sheet 2 will be described with reference to FIG.

  First, the belt-like processed sheet 2 overlapped in the previous step is supplied between a pair of seal block bodies 3 and 3 facing each other. As shown in FIG. 4A, since the pair of seal block bodies 3 and 3 are in a state of being separated from each other, the pattern block 4 provided in each seal block body 3 is in contact with the heater block 5. The heater block 5 is sufficiently heated.

  Next, the pair of seal block bodies 3 and 3 are moved so as to be close to each other. At that time, before the pattern block 4 comes into contact with the belt-like processed sheet 2, the heater is provided at a position wider than the width of the belt-shaped processed sheet 2 and protrudes beyond the thickness of the belt-shaped processed sheet 2. Each protruding hook 53 provided in the block 5 comes into contact with the surface of the other pattern block 4 facing each other. As the pair of seal block bodies 3 and 3 come closer to each other, each protruding rod 53 is pressed by the opposing pattern block 4, and with the pressing force that pushes the protruding rod 53 against the elastic force of the spring 54, The heater block 5 starts to be separated from the pattern block 4 via the protruding rod 53. Therefore, at the time of sealing for sandwiching and sealing the belt-like processed sheet 2 by the pair of pattern blocks 4, the heater blocks 5 and 5 of the pair of seal block bodies 3 and 3, as shown in FIG. , Completely separated from the pattern blocks 4 and 4.

  At the time of sealing, the amount of heat held by each pattern block 4 is taken away in order to melt the belt-like processed sheet 2 sandwiched between the pair of pattern blocks 4. Accordingly, the temperature of each pattern block 4 decreases as the belt-like processed sheet 2 is melted. Here, even if the temperature sensor 52 provided in the pattern block 4 outputs a temperature drop signal, each heater block and each pattern block 4 are completely separated from each other. The temperature of each pattern block 4 continues to decrease while maintaining the state sandwiching. On the other hand, since the temperature sensor 52 provided in the pattern block 4 continues to output a temperature drop signal, the heater block 5 is heated by the heater 51 to a set temperature or higher.

  When the temperature of each pattern block 4 is lowered and the melting point of the belt-like processed sheet 2 falls below the melting point of the material of the belt-like processed sheet 2, the melted portion of the belt-like processed sheet 2 is pressed between the pair of pattern blocks 4. While maintaining, the transition is from a molten state to a solidified state. Here, the degree of the temperature drop of the pattern block 4 is preferably 5 ° C. or more, more preferably 10 ° C. to 40 ° C. In the first embodiment, since control means (not shown) is provided, the temperature of each pattern block 4 can be forcibly lowered by blowing air through the air port 43. In addition, the product can be continuously produced by cutting and separating the seal portion 20 (see FIG. 1) formed by intermittent solidification of the melted portion in the next step.

  Next, as each seal block body 3 begins to move away from the other pattern block 4 facing each other, the heater block 5 and the pattern block 4 begin to approach each other due to the biasing force of the spring. After the sealing, the heater blocks 5 and 5 of the pair of seal block bodies 3 and 3 are completely in contact with the pattern blocks 4 and 4 as shown in FIG. 53 returns to the original state where the tip protrudes from the seal pattern forming surface of the pattern block 4.

When each heater block 5 comes into contact with the pattern block 4 after sealing, each pattern block 4 whose temperature has been lowered receives supply of heat from each heater block 5 heated to a set temperature or more, and each pattern block 4 Can recover to the set temperature in a short time.
Therefore, according to the heat sealing apparatus 1A, the temperature of each pattern block 4 is decreased while maintaining the pressurized state in which the belt-like workpiece sheet 2 is sandwiched between the pair of pattern blocks 4, and the belt-like workpiece is processed. Since the melted portion of the sheet 2 can be shifted from the molten state to the solidified state, the seal strength of the applied seal portion 20 is unlikely to become unstable. Further, as described above, since each pattern block 4 recovers to the set temperature in a short time after sealing, the sealing portion 20 can be intermittently applied to the belt-like processed sheet 2.

  As the belt-like processed sheet 2 superimposed in the previous step, a laminate of paper, nonwoven fabric, resin film, etc., a laminate of two or more types of nonwoven fabric, a laminate of resin film and nonwoven fabric, and a cylindrical bag A belt-shaped belt made of a continuum of outer packaging material folded in two with an absorbent main body (for example, the one shown in FIG. 1 of Japanese Patent Application Laid-Open No. 2007-50934) loaded with contents (such as sweets and wet tissue) A diaper continuous body (for example, the one shown in FIG. 3 of JP 2008-137271 A) can be used. In addition, when the strip | belt-shaped to-be-processed sheet 2 is a strip | belt-shaped diaper continuous body, the provided seal | sticker part 20 turns into what is called a side seal | sticker part. Examples of the material of the processed sheet 2 include polyolefin resins typified by polyethylene and polypropylene.

Hereinafter, the heat sealing apparatus of the present invention will be described based on its preferred second embodiment with reference to FIGS.
About the heat seal apparatus 1B of 2nd Embodiment (henceforth "heat seal apparatus 1B"), a different point from 1 A of heat seal apparatuses of 1st Embodiment is demonstrated. The points that are not particularly described are the same as those of the heat seal device 1A of the first embodiment, and the description of the heat seal device 1A of the first embodiment is appropriately applied.

  As shown in FIG. 5, the heat seal device 1 </ b> B of the second embodiment is a roll motion type seal device including a pair of opposed rolls, and the heat seal device 1 </ b> A is a box motion type seal device. And different. Moreover, the heat seal apparatus 1B of 2nd Embodiment differs from 1 A of heat seal apparatuses which are the utilization of the spring 54 in the point that the movement of the heater block 5 is the air cylinder 55, as shown in FIG. 6, FIG.

  As shown in FIG. 5, the heat seal device 1 </ b> B includes a pair of opposing cylindrical processing rolls (hereinafter also simply referred to as “rolls”) 11 and 11, and a seal block is provided on the peripheral surface of each roll 11. The body 3 is provided. The pair of rolls 11 and 11 are provided so as to rotate synchronously when a driving force from a driving means (not shown) is transmitted to their rotating shafts. The heat seal device 1B is formed so that the belt-like processed sheet 2 is sandwiched between the seal block bodies 3 and 3 when the pair of rolls 11 and 11 are rotating. The control of the drive means for the pair of rolls 11 and 11 is controlled to a variable speed at which the sealing time becomes relatively long by a control means (not shown) provided in the heat seal apparatus 1B. Specifically, the pair of rolls 11 and 11 are controlled to change the rotation of the rolls in a variable manner, and are controlled so as to rotate at a low speed or temporarily stop rotation when sealed. It is controlled so as to rotate at high speed in other cases. Thus, the heat seal device 1B of the second embodiment is a so-called roll rotation type seal device controlled to be variable in speed.

  In the heat seal device 1B of the second embodiment, the pattern block 4 disposed at the tip of each of the pair of seal block bodies 3 has a heat seal device 1A of the first embodiment as shown in FIGS. Such a through hole 41 is not formed. In the heat seal device 1B of the second embodiment, as shown in FIGS. 6 and 7, the pattern block 4 has a cylindrical hole 42 in which the temperature sensor 52 is disposed. The air port 43 as in the heat seal device 1A of the embodiment is not formed. In addition, also in the pattern block 4 of the heat seal apparatus 1B of the second embodiment, an air port 43 of a cooling means may be provided as necessary.

  In the heat seal device 1B of the second embodiment, as shown in FIGS. 6 and 7, the heater block 5 disposed inside each of the pair of seal block bodies 3 includes air or the like on the opposite side to the pattern block 4. The air cylinder 55 by compression is arranged, and the protruding rod 53 like the heat seal device 1A of the first embodiment is not arranged. In the heat seal device 1B of the second embodiment, the air cylinder 55 is controlled by a control means (not shown), and the heater block 5 and the pattern block 4 are sealed during sealing by the control of the air cylinder 55 by the control means. After being separated and sealed, the heater block 5 and the pattern block 4 are formed so as to come into contact again. Specifically, the control means (not shown) includes a position detector (not shown) installed outside the seal block body 3. The position detector detects the position of the pattern block 4 of each roll 11 and transmits the information as a signal to the control means. Based on the signal from the position detector, the control means determines whether or not the belt-like processed sheet 2 is sandwiched between the pair of pattern blocks 4 and 4, moves the air cylinder 55 with compressed air, 5 is separated from the pattern block 4 or brought into contact with the pattern block 4.

  As shown in FIG. 6, the heater 51 of the second embodiment extends across both ends in the longitudinal direction (Z direction) of the heater block 5, and the two heaters 51, as shown in FIG. 7, They are juxtaposed at the center in the Y direction with a gap in the Y direction. In the second embodiment, the temperature sensor 52 of the heater 51 is disposed inside the hole 42 of each pattern block 4.

  The heat sealing apparatus 1B includes a control unit (not shown), which controls the rotation speed of the roll 11 described above, the temperature control of the heater 51 disposed in the heater block 5, and the air described above. The operation of the cylinder 55 is controlled according to a predetermined operation sequence.

  Next, the operation of the heat sealing apparatus 1B that intermittently seals the belt-like processed sheet 2 will be described with reference to FIG.

  First, the belt-like processed sheet 2 overlapped in the previous step is supplied between a pair of opposed rolls 11 and 11. As shown in FIG. 8A, since the pair of seal block bodies 3 and 3 are in a state of being separated from each other, the pattern block 4 provided on each seal block body 3 is in contact with the heater block 5. The heater block 5 is sufficiently heated.

  Next, when each pattern block 4 of the pair of seal block bodies 3 and 3 comes into contact with the belt-like processed sheet 2 and a load is applied to each pattern block 4, the position moved by the load is detected by a position detector (not shown). The position detector (not shown) transmits the information as a signal to the control means (not shown). When the control means (not shown) receives a signal from a position detector (not shown) and reaches a predetermined set position, the belt-like processed sheet 2 is sandwiched between the pair of pattern blocks 4 and 4. The air cylinder 55 is activated and the heater block 5 is separated from the pattern block 4. Thus, at the time of sealing, as shown in FIG. 8B, the heater blocks 5 and 5 of the pair of seal block bodies 3 and 3 are completely separated from the pattern blocks 4 and 4, respectively. Note that the air cylinder 55 of the second embodiment is controlled so that the pattern block 4 and the heater block 5 are separated from each other when the detection signal is generated by compressed air, and are contacted at other times. Depending on the cylinder, separation may be performed by compressed air, contact may be performed by a spring biasing force, or separation may be performed by a spring biasing force, and contact may be performed by compressed air. Moreover, you may control using the load detector which detects the load concerning the pattern block 4 other than a position detector (not shown).

  At the time of sealing, the amount of heat held by each pattern block 4 is taken away in order to melt the belt-like processed sheet 2 sandwiched between the pair of pattern blocks 4. Accordingly, the temperature of each pattern block 4 decreases as the belt-like processed sheet 2 is melted. Here, even if the temperature sensor 52 provided in the pattern block 4 outputs a temperature drop signal, each heater block and each pattern block 4 are completely separated from each other. During the state, the temperature of each pattern block 4 continues to decrease. On the other hand, since the temperature sensor 52 provided in the pattern block 4 continues to output a temperature drop signal, the heater block 5 is heated by the heater 51 to a set temperature or higher.

  When the temperature of each pattern block 4 is lowered and the melting point of the belt-like processed sheet 2 falls below the melting point of the material of the belt-like processed sheet 2, the melted portion of the belt-like processed sheet 2 is pressed between the pair of pattern blocks 4. While maintaining, the transition is from a molten state to a solidified state.

  Next, when the pattern blocks 4 and 4 of the pair of seal block bodies 3 and 3 become perpendicular to the Y direction (at the same time as they become vertical), the pattern block 4 and the heater block 5 begin to separate. After the sealing, as shown in FIG. 8A, when the pair of seal block bodies 3 and 3 are not in a state of completely sandwiching the work sheet 2, the air cylinder 55 is operated again, and the heater block 5 And the pattern block 4 come into contact again.

When each heater block 5 comes into contact with the pattern block 4 after sealing, each pattern block 4 whose temperature has been lowered receives supply of heat from each heater block 5 heated to a set temperature or more, and each pattern block 4 Can recover to the set temperature in a short time.
Therefore, according to the heat sealing apparatus 1B, the temperature of each pattern block 4 is lowered while maintaining the pressurized state in which the belt-like workpiece sheet 2 is sandwiched between the pair of pattern blocks 4, and the belt-like workpiece is processed. Since the melted portion of the sheet 2 can be shifted from the molten state to the solidified state, the seal strength of the applied seal portion 20 is unlikely to become unstable. Further, as described above, since each pattern block 4 recovers to the set temperature in a short time after sealing, the sealing portion 20 can be intermittently applied to the belt-like processed sheet 2.

  The heat sealing apparatus of the present invention is not limited to the heat sealing apparatuses 1A and 1B of the first and second embodiments described above, and can be changed as appropriate. Moreover, each component in the heat seal apparatuses 1A and 1B according to the first and second embodiments described above can be appropriately combined and implemented without departing from the spirit of the present invention. For example, a type in which the movement of the heater block 5 of the second embodiment is performed by the air cylinder 55 may be used for the first embodiment, and the heater block 5 of the first embodiment may be used for the second embodiment. A type in which the movement is performed by the protruding rod 53 may be used.

  For example, in the heat sealing apparatuses 1A and 1B of the first and second embodiments described above, two heaters 51 are arranged in the heater block 5 as shown in FIGS. However, it may be three or more. In the heat sealing apparatuses 1A and 1B of the first and second embodiments, as shown in FIGS. 2 and 6, the temperature sensor 52 of the heater 51 is disposed inside the hole 42 of each pattern block 4. However, it may be arranged outside.

  Moreover, in the heat seal apparatus 1A of the first embodiment described above, the through-hole 41 is formed in the pattern block 4 disposed on the top surface of the seal block body 3 as shown in FIGS. However, it may not be formed in the pattern block 4, and may be formed in the seal block body. Further, in the heat seal device 1A of the first embodiment described above, as shown in FIG. 2, the through-hole 41 is provided at both end portions 4a and 4a in the longitudinal direction (Z direction) (two), and the heater block 5 has protrusions 53 that are movable in each through hole 41, but the number of through holes 41 may be one or more, and the heater block 5 has protrusions corresponding to the number of through holes 41. What is necessary is just to have the collar 53. FIG.

  Further, in the heat sealing apparatus 1A of the first embodiment described above, as shown in FIG. 4, the protruding hook 53 provided in one heater block 5 and the protruding hook 53 provided in the other heater block 5 However, although it is not arranged at a position facing each other, it may be arranged at a position facing each other. Further, in the heat sealing apparatus 1A of the first embodiment described above, as shown in FIG. 4, each moving body 10 is moved so that the pair of seal block bodies 3 and 3 are close to each other. Only the movable body may be driven. Further, in the heat sealing apparatus 1A of the first embodiment described above, as shown in FIG. 4, each of the pair of seal block bodies 3 and 3 has the heater block 5, but only one of them is the heater block 5. It may be a single side heating type.

  Further, in the roll rotation type heat seal device 1B of the first embodiment shown in FIG. 5, the pair of seal block bodies 3 and 3 is used, but a plurality of pairs of seal block bodies 3 and 3 facing each roll surface are provided. It may be provided.

1A. 1B Heat Sealing Device 2 Strip-shaped Worksheet 20 Seal Part 3 Seal Block Body 4 Pattern Block 4a End 41 Through Port 5 Heater Block 51 Heater 52 Temperature Sensor 53 Projection Fence 54 Spring 55 Air Cylinder 56 Plate 57 End Plate 10 Moving Body 11 rolls

Claims (6)

A heat seal device that intermittently seals the processed sheet by passing the overlapped strip-shaped processed sheet between a pair of opposed seal block bodies.
Each pair of the seal block body, fixed to the tip of the seal block body, wherein the pattern block to apply a seal on the processed sheet is disposed inside of the seal block body, a heater block for heating the pattern block Have
The heater block is provided so as to be separated from the pattern block,
The workpiece sheet is sandwiched and sealed by a pair of opposed pattern blocks,
Each of the heater blocks of the pair of seal block bodies is a heat seal device that is separated from the pattern block at the time of sealing and contacts the pattern block after sealing. The seal block body has a through-hole penetrating in a direction in which the pair of seal block bodies face each other,
The heater block of the seal block body has a protruding hook that is movably inserted in the through-hole, and a spring disposed on the opposite side of the protruding hook,
The spring is disposed between the heater block and an end plate forming a bottom surface of the seal block body,
The heater block of the seal block body is separated from the pattern block through the protruding rod against the elastic force of the spring when the protruding rod is pushed during sealing, and is energized by the spring force after sealing. The heat sealing apparatus according to claim 1, wherein the heat sealing apparatus is in contact with the pattern block.   The said through-hole is formed in the said pattern block of each of a pair of said seal block bodies, and is formed in each of the both ends of the said pattern block of the direction orthogonal to the supply direction of a strip | belt-shaped to-be-processed sheet. The heat sealing apparatus as described. The heater block includes a heater for heating,
The heat sealing apparatus according to claim 1, wherein the pattern block of the seal block body includes a temperature sensor of the heater.   The heat sealing apparatus according to any one of claims 1 to 4, wherein the pattern block of the seal block body includes a cooling unit that lowers the temperature of the pattern block.   The cooling means has an air port penetrating across both ends in a direction orthogonal to the supply direction of the strip-shaped work sheet in the pattern block, and the temperature of the pattern block is blown through the air port. The heat seal device according to claim 5 which lowers.

Images