SEALING DEVICE FOR PACKAGING MATERIAL AND MEASURING METHOD FOR FUSION TEMPERATURE OF PLASTICS

Abstract: A sealing device 30 for a packaging material 10, comprising a linear sealing device 31 for sandwiching layers to be sealed 11A, 12A of plastic sheets 11, 12 are sandwiched by sealing bars 41, 42 narrower than a sealing width, and pressuring the layers to be sealed in a heated state, a surface sealing device 32 for sandwiching the layers to be sealed 11A, 12A of the plastic sheets 11, 12 with sealing bars 51, 52 of a width necessary for sealing by the sealing width, and pressing the layers to be sealed in a melting state.

Description: DESCRLPTION SEALING DEVICE FOR PACKAGING MATERIAL AND MEASURING METHOD FOR FUSION TEMPERATURE OF PLASTICS Technical Filed The present invention relates to a sealing device for a packaging material, such as a standing pouch, a pillow package, a blister package, and a tube to be used for a refill, made of a single layer plastic sheet, and a laminated plastic sheet, and measuring method for fusion temperature of plastics, such as a sealing temperature of a plastic sheet comprising a packaging material such as a standing pouch, and a tube. Background Art A packaging material comprising plastic sheets is used for sealing by overlapping layers to be sealed (sealant layers) of the plastic sheets facing with each other, and pressuring the same with a sealing bar (mold) such as a heat sealing bar from the outside so as to press and fuse the layers to be sealed in a melting temperature state. (A) In conventional sealing devices, it comprises either a surface sealing device for pressuring layers to be sealed of plastic sheets with a seal bar of a width necessary for sealing by the plastic sheet sealing width so as to pressing the layers to be sealed in a melting state, or the surface sealing device, and a cooling sealing device disposed subsequent thereto, for pressuring the layers to be sealed of the plastic sheets, pressed by the surface sealing device with a cooling sealing bar so as to cooling and sohdifying the pressed state of the layers to be sealed. However, the conventional technique involves the following problems. (1) It is difficult to pressure the entire area of the layers to be sealed of the plastic sheets with a sealing bar stably by a high pressure in the surface sealing device or the cooling sealing device. At a part with a weak pressure, entanglement of the plastic cannot be produced sufficiently, and thus the risk of sealing failure is involved. In the case a high pressure is provided to the entire area, the layers to be sealed are deformed so that a necessary thickness cannot be retained. (2) In the case a liquid (filling content of the packaging material) or a highly viscous product thereof is adhered on the layers to be sealed of the plastic sheets, the sealing operation is executed with the liquid disposed between the layers to be sealed, and thus the risk of sealing failure is involved. An object of the present invention is to certainly press and seal layers to be sealed of plastic sheets, facing with each other. (B) Moreover, as to the sealing temperature administration for a plastic sheet in the conventional production of a packaging material, merely the heat sealing bar surface temperature and the surface temperature of the layers to be sealed or the plastic sheets are measured with a contact type thermometer or a non-contact type thermometer (infrared ray thermometer, or the like), but the temperature of the sealant material at the time of actually fusing is not measured. However, according to the knowledge of the present inventors, in order to certainly fuse the plastic sheet, the temperature of the layers to be sealed of the plastic sheets should be an extrapolated melting end temperature or more, higher than the melting peak temperature of the plastic, and thus the temperature of the layers to be sealed (sealant material) should be administered accurately. With a temperature lower than the extrapolated melting end temperature, although a part of the molecular weight of the plastic comprising the layers to be sealed is melted, a molecular weight side is not melted so that an unstable sealing may be provided. An object of the present invention is to accurately measure the temperature of the sealant material at the time of actually fusing the plastic. The extrapolated melting end temperature will be explained in an embodiment. An object of the present invention is to accurately measure the temperature of the sealant material at the time of actually fusing the plastic sheet comprising a packaging material, or the like. DISCLOSURE OF THE INVENTION (A) The present invention provides a sealing device for a packaging material for overlapping layers to be sealed of plastic sheets, facing with each other, pressuring the same from the outside with a sealing bar, and pressing the layers to be sealed in a melting state by a predetermined sealing width so as to be sealed, comprising a linear sealing device for pressuring the layers to be sealed of the plastic sheets are pressured with a sealing bar having a width narrower than the sealing width, and pressuring the layers to be sealed in a heated state, and a surface sealing device disposed subsequent to the linear sealing device, for pressuring the layers to be sealed of the plastic sheets including the part pressured by the linear sealing device with a sealing bar having a width necessary for sealing by a sealing width, and pressing the layers to be sealed in a melting state. (B) Moreover, the present invention is for measuring the temperature with a temperature measuring contact comprising a thermometer mounted on a fused part of a plastic. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a filling sealing device for a packaging material. FIG. 2 is a schematic diagram showing a sealing mechanism of the sealing device. FIG. 3 is a schematic diagram showing the positional relationship of a sealing bar comprising the sealing device. FIG. 4 is a schematic diagram showing an adjusted embodiment of a pressuring state of the sealing bar. FIG. 5 is a graph showing a melting temperature characteristic of a plastic sheet. FIG. 6 is a graph showing a sealing temperature condition of the sealing device. FIG. 7 is a schematic diagram showing a sealing temperature measuring method of the present invention. FIG. 8 is a schematic diagram showing a method for setting a thermocouple to a p ackaging material. FIG. 9 is a schematic diagram showing the mounting positional relationship of the sealing device and the thermocouple. BEST MODE FOR CARRYING OUT THE INVENTION (A) Sealing device for a packaging material FIG. 1 shows a filling sealing device 20 for filling a packaging material 10 such as a standing pouch with a content such as a detergent, and sealing the same. The filling sealing device 20 comprises a bag supplying part 21, a bag printing part 22, a bag opening part 23, a spare part 24, a filling part 25, a spare part 26, a first sealing part 27, a second sealing part 28, and a cooling part (and bag discharging part) 29. In the filling sealing device 20, the packaging material 10 in a bag state having the upper part opened, with plastic sheets 11, 12 facing with each other and a bottom part plastic sheet (not shown) preliminarily sealed at both side parts and the bottom part is supplied to the bag supplying part 21. After filling a content from the upper part opening by the filling part 25, the layers to be sealed 11A, 12A of the upper part opening are overlapped, pressed and sealed with each other by the first sealing part 27, the second sealing part 28, and the cooling part 29 comprising a sealing device 30 according to the present invention. As the plastic sheets 11, 12, for example, those comprising an outer layer of, for example, a polyethylene terephthalate, a gas barrier layer bonded with the outer layer of, for example, an aluminum foil, and thermally fusible layers to be sealed 11A, 12A bonded with the gas barrier layer of, for example, a polyethylene, can be used. The sealing device 30 comprises a linear sealing device 31 in the first sealing part 27, a surface sealing device 32 in the second sealing part 28, and a cooling sealing device 33 in the cooling part 29. The filling sealing device 20 comprises two sets of the linear sealing devices 31, the surface sealing devices 32, and the cooling sealing devices 33 each in the first sealing part 27, the second sealing part 28, and the cooling part 29 for improving the productivity. As shown in FIG. 2(A), the linear sealing device 31 comprises a pair of sealing bars 41, 42 for sandwiching the plastic sheets 11, 12. The sealing bar 41 and/or 42 comprises a narrow width pressuring part 41A and/or 42A (width P) (P is 90% or less with respect to the sealing width. It is 0.1 to 2 mm, more preferably 0.7 to 1.2 mm in the case the sealing width is more than 2.5 mm, and 0.1 to 1.5 mm, more preferably 0.7 to 1.2 mm in the case the sealing width is 2.5 mm or less.). In the linear sealing device 31 according to this embodiment, the sealing bars 41, 42 are provided as heat seaHng bars storing a heater so that the plastic sheets 11, 12 can be heated by the sealing bars 41, 42 themselves. That is, the linear sealing device 31 sandwiches the layers to be sealed 11 A, 12 A of the plastic sheets 11, 12 by the seaHng bars 41, 42 of a width narrower than the sealing width defined by the narrow width pressuring part 41A for pressuring the layers to be sealed 11A, 12A in the heated state. The same is appHed to 42A. As shown in FIG. 2(B), the surface seaHng device 32 comprises a pair of seaHng bars 51, 52 for sandwiching the plastic sheets 11, 12. The seaHng bar 51 and/or 52 comprises a wide width pressuring part 51A and/or 52 A ((width Q) (preferably Q>P(mm)) of a width necessary for seaHng by a seaHng width. In the surface seaHng device 32 according to this embodiment, the seaHng bars 51, 52 are provided as heat seaHng bars storing a heater so that the plastic sheets 11, 12 can be heated by the seaHng bars 51, 52 themselves. That is, the surface seaHng device 32 is disposed subsequent to the linear seaHng device 31 such that it sandwiches the layers to be sealed 11A, 12A of the plastic sheets 11, 12 including the part pressured by the linear seal 31 by the seaHng bars 51, 52 of a width necessary for seaHng by the seaHng width defined by the wide width pressuring part 51A for pressing the layers to be sealed HA, 12A in the melting state. The same is appHed to 52A. As shown in FIG. 2(C), the cooling seaHng device 33 comprises a pair of cooling seaHng bars 61, 62 for sandwiching the plastic sheets 11, 12. The cooling seaHng bars 61, 62 store a cooHng water circulation path, or the like so that the plastic sheets 11, 12 can be cooled down by the seaHng bars 61, 62 themselves. That is, the cooHng seaHng device 33 is disposed subsequent to the surface seaHng device 32 such that it sandwiches the layers to be sealed 11A, 12A of the plastic sheets 11, 12 including the part pressed by the surface seaHng device 32 by the cooHng seaHng bars 61, 62 for cooling and soHdifying the layers to be sealed 11A, 12 A in the pressed state. In the seaHng device 30, as shown in FIG. 3, the sandwiching position of the seaHng bars 41, 42 (narrow width pressuring part 41A) of the Hnear seaHng device 31, the sandwiching position of the seaHng bars 51, 52 (wide width pressuring part 51A) of the surface seaHng device 32, and the sandwiching position of the seaHng bars 61, 62 of the cooHng seaHng device 33 corresponding to the layers to be sealed 11A, 12A of the plastic sheets 11, 12 are disposed, overlapping with each other. Accordingly, the surface seaHng device 32 sandwiches the layers to be sealed 11A, 12A of the plastic sheets 11, 12 including the part pressured by the Hnear seaHng device 31, and the cooHng seaHng device 33 sandwiches the layers to be sealed 11A, 12A of the plastic sheets 11, 12 including the part pressed by the surface seaHng device 32. Moreover, in the seaHng device 30, each of the seaHng bars 41, 42, the sealing bars 51, 52, and the cooling seaHng bars 61, 62 needs to pressure the entire region of the layers to be sealed 11A, 12A evenly in the Hnear seaHng device 31, the surface seaHng device 32, and the cooling seaHng device 33. In a part with a weak pressure, the heat amount and the pressure necessary for seaHng cannot be provided sufficiently, and thus there is a possibiHty of seaHng failure. The pressuring state of the sealing bar 41, or the Hke is adjusted, for example, as shown in FIG. 4, by the thickness adjustment of a shim 44 provided at a pluraHty of positions in the periphery of the pressuring part 41A in a mounting base 43 with the sealing bar 41, or the Hke mounted. For certain seaHng by the seaHng device 30, the seaHng surface temperature of the layers to be sealed HA, 12A of the plastic sheets 11, 12 should be the extrapolated melting end temperature of the plastic or more. That is, it is important that the seaHng surface temperature in the pressuring final stage by the Hnear seaHng device 31, the seaHng surface temperature in the pressing final stage by the surface seaHng device 32, and in particular, the seaHng surface temperature immediately before pressing by the cooling seaHng device 33 is the extrapolated melting end temperature or more. With less than the extrapolated melting end temperature, although the low molecular weight side of the plastic comprising the layers to be sealed 11A, 12A is melted, there is a possibiHty of an unstable seaHng without melting of the high molecular weight side. The extrapolated melting end temperature of the plastic can be measured by the JIS K7121 (testing methods for transition temperature of plastics). Here, the transition temperature of the layers to be sealed 11A, 12 A is measured, and the extrapolated melting end temperature at the time is shown in FIG. 5(A) with the melting peak temperature and the extrapolated melting onset temperature. As shown in FIG. 5(A), the extrapolated melting end temperature is a temperature at the intersection of the extrapolated part of the straight line approximated the substantially straight line part of a peak curve at the melting peak temperature or more, and the base Hne. The seaHng surface temperature of the layers to be sealed llA, 12A can be found by, for example, as shown in FIG. 5(B), mounting a thermocouple 70 with a 0.1 mm diameter on the sheet surface of the layers to be sealed llA, 12A, heating and pressing the layers to be sealed HA, 12A as mentioned above, and converting the minute voltage generated in the process into the temp er ature . Therefore, the seaHng operation by the seaHng device 30 is executed as follows (FIG. 6). (1) First seaHng In the Hnear seaHng device 31 of the first seaHng part 27, with the layers to be sealed 11 A, 12 A of the plastic sheets (for example low density polyethylene (LDPE) sheet) 11, 12 sandwiched by the seaHng bars 41, 42 of the narrow seaHng width, the layers to be sealed 11A, 12A are heated (for example, the seaHng surface temperature is 175°C) to the extrapolated melting end temperature (for example, it is 125°C) or more, and pressured (for example, P = 1 mm). In this first seaHng step, Hquid adhered on the layers to be sealed 11A, 12A, or the Hke, is ehminated from the seaHng surface, the water content is evaporated, the layers to be sealed are melted, and the periphery of the pressuring part is pre-heated. (2) Second seaHng In the surface seaHng device 32 of the second seaHng part 28, with the layers to be sealed HA, 12A of the plastic sheets 11, 12 sandwiched by the seaHng bars 51, 52 of the width necessary for seaHng by the seaHng width (for example, Q = 6 mm or Q = 4 mm), the entirety of the layers to be sealed 11A, 12 A are melted and pressed again to the extrapolated melting end temperature or more (for example, the sealing surface temperature is 170°C). (3) Third seaHng In the cooHng seaHng device 33 of the cooHng part 29, the layers to be sealed 11A, 12A of the plastic sheets 11, 12 in the state at the extrapolated melting end temperature or more are sandwiched by the cooHng seaHng bars 61, 62 for cooHng and soHdifying the layers to be sealed 11A, 12A in the pressed state. According to this embodiment, the fallowing effects can be provided. (Effects corresponding to claim 1) (1) Since the layers to be sealed llA, 12A of the plastic sheets 11, 12 are sandwiched by the sealing bars 41, 42 narrower than the seaHng width of the Hnear seaHng device 31, the entire region of the layers to be sealed 11 A, 12 A can be sandwiched stably with a high pressure so that entanglement of the plastic can be produced sufficiently. (2) According to the seaHng bars 41, 42 narrower than the seaHng width of the Hnear seaHng device 31, even in the case a Hquid or a highly viscous produce thereof is adhered on the layers to be sealed 11A, 12A, these substances can be eHminated by heating for evaporation, or extrusion by a high pressure, and thus the seaHng property of the subsequent surface seaHng device 32 can be improved. (3) In the case the seaHng bars 41, 42 narrower than the seaHng width of the Hnear seaHng device 31 are heat seaHng bars, the pressuring part of the layers to be sealed llA, 12 A can be heated evenly as weU as the peripheral part thereof can be heated in a stable temperature state with a small temperature irregularity in the entire working surface of the seaHng bars 41, 42, and thus the seaHng property in the subsequent surface seaHng device 32 can be improved. (4) The seaHng bars 51, 52 of the width necessary for seaHng by the seaHng width of the surface seaHng device 32 presses a wider part of the layers to be sealed llA, 12A including the pressuring part of the above-mentioned items (1) to (3) by the Hnear seaHng device 31 certainly in a melting state. (Effects corresponding to claim 2) (5) Since the cooHng seaHng bars 61, 62 of the cooHng seaHng device 33 presses the layers to be sealed 11A, 12 A including the pressing part of the above-mentioned item (4) by the surface seaHng device 32 in a melting state and cools down to the soHdifying temperature, the seaHng operation can be executed certainly. (Effects corresponding to claim 3) (6) Since the melting temperature at the time of pressing by the surface seaHng device 32 is the extrapolated melting end temperature or more of the plastic comprising the layers to be sealed 11A, 12 A, the layers to be sealed 11A, 12 A can be sealed completely with the high molecular weight side of the plastic with a dispersed molecular amount also melted completely. (Effects corresponding to claim 4) (7) Since the melting temperature immediately before pressing by the cooHng seaHng device 33 is the extrapolated melting end temperature or more of the plastic comprising the layers to be sealed 11 A, 12 A, the layers to be sealed 11 A, 12A can be sealed completely with the high molecular weight side of the plastic with a dispersed molecular amount also melted completely. The seaHng device according to the present invention can be adopted also to those for seaHng with layers to be sealed of three or more plastic sheets overlapped with each other. Moreover, the seaHng device according to the present invention is not Hmited to a device for heat seaHng, but it can also be adopted to those for supersonic seaHng, high frequency seaHng, hot air seaHng for pressing with seaHng bars after heating plastic sheets with hot air, or the Hke. (B) Melting temperature measuring method for plastic FIG. 7 shows a thermoelectric thermometer 14 for measuring the temperature of the sealant material of the layers to be sealed 11A, 12A at the time of seaHng by sandwiching the layers to be sealed (sealant layers) 11 A, 12A of the plastic sheets 11, 12 facing with each other comprising the packaging material 10 by a pair of the heat seaHng bars 13, 13, and pressing (fusing) the layers to be sealed 11A, 12A in a melting state. As the plastic sheets 11, 12, for example, layers to be sealed 11A, 12A comprising an outer layer of, for example, a polyethylene terephthalate, a gas barrier layer bonded with the outer layer of, for example, an aluminum foil, and thermally fusible layers to be sealed 11 A, 12 A made from a sealant material, bonded with the gas barrier layer of, for example, a polyethylene, can be used. As the thermometer, a thermoelectric thermometer is preferable. The thermoelectric thermometer 14 is for attaching a temperature measuring contact M of a thermocouple 15 (for example, a combination of wires 15A, 15B made from two kinds of metals of a chlomel and an alumel) on the seaHng surface of the layers to be sealed 11A, 12A, connecting a reference contact (0°C contact) of a compensating lead line 16 connected with the thermocouple 15 with a temperature voltage converter 17, and displays the output temperature of the temperature voltage converter 17 on a display part 19A of a personal computer 19 via an A D conversion slot card 18. That is, the thermoelectric thermometer 14 is for converting the ther o- electromotive force of the thermocouple 15 determined by the temperature of the temperature measuring point M of the thermocouple 15, which is the sealant material temperature when the layers to be sealed 11 A, 12 A are actually fused into the temperature thereof in the temperature voltage converter 17, and displaying the same on the display p art 19 A. In the case the packaging material 10 is a pouch, as shown in FIG. 8(A), the thermocouple 15 inserted from a notch hole provided in the plastic sheet 11 or 12 is attached on the seaHng surface of the layer to be sealed 11A or 12 A. In the case the packaging material 10 is a tube, as shown in FIG. 8(B), the thermocouple 15 inserted from a notch hole provided in the plastic sheet 11 or 12 (the plastic sheet 11 and the plastic sheet 12 denotes each of semi circular parts facing with each other of the cyHndrical sheet) is attached on the seaHng surface of the layer to be sealed 11A or 12A. Therefore, according to this embodiment, the following effects can be provided. Since the thermocouple 15 is mounted on the seaHng surface of the layers to be sealed llA, 12A of the plastic sheets 11, 12 facing with each other, and the layers to be sealed llA, 12A are fused and sealed with the thermocouple 15 sandwiched, the temperature of the sealant material when the plastic sheets 11, 12 are actuaUy fused can be measured directly and accurately by the thermocouple 15. Accordingly, it is confirmed accurately that the layers to be sealed llA, 12A of the plastic sheets 11, 12 reaches at an appropriate melting temperature at the time of seaHng. Next, an embodiment of adopting the thermoelectric thermometer 14 according to the present invention for measurement of the seaHng temperature of the packaging material 10 to be sealed by the seaHng device 30 of the filling seaHng device 20 will be explained with reference to FIG. 1. That is, in the seaHng device 30, the actual seaHng surface temperature of the layers to be sealed HA, 12A of the plastic sheets 11, 12 comprising the packaging material 10 can be measured using the above-mentioned thermoelectric thermometer 14 as foHows. (1) The temperature measuring contact M of the thermocouple 15 (for example, by peeling off the enamel on each top end of a chlomel wire 15A, and an alumel wire 15B each having a 0.1 mm diameter covered with an enamel, and welding with each other, a temperature measuring contact M is formed), is fixed on the plastic sheet 11 or 12 with an adhesive tape 101 as shown in FIG. 9 such that it is mounted on a position corresponding to the center of the narrow width pressuring part 41 A of the Hnear sealing device 31 in the layers to be sealed HA, 12A of the plastic sheets 11, 12 of a 0.13 mm thickness. A good response property can be provided in the case the diameter of the chlomel wire 15A and the alumel wire 15B is 0.1 mm or less so that the seaHng bars are not destroyed at the time of pressuring, and thus it is preferable. (2) The layers to be sealed HA, 12A of the plastic sheets 11, 12 are heated and pressed by the Hnear seaHng device 31, the surface seaHng device 32, and the cooHng seaHng device 33 of the seaHng device 30 as mentioned above. The thermo-electromotive force generated in the thermocouple 15 during the process is converted to the temperature by the temperature voltage converter 17, and the temperature is displayed on the display part 19A. The displayed temperature is the actual seaHng surface temperature of the layers to be sealed HA, 12A. The seaHng surface temperature of the layers to be sealed 11A, 12A obtained by measuring the layers to be sealed HA, 12 A of the plastic sheets 11, 12 as in the above-mentioned items (1), (2) is as shown in FIG. 7. The sealing temperature measuring method for a plastic sheet according to the present invention is not Hmited for heat seaHng, but it can also be adopted for ultrasonic seaHng, high frequency seaHng, hot air seaHng for pressing with seaHng bars after heating plastic sheets with hot air, or the Hke. Moreover, measuring method for the fusion temperature of plastics according to the present invention is not Hmited for fusion of plastic sheets, but it can also be adopted for fusing a plastic to another plastic, or fusing a plastic to another material such as a metal. Industrial AppHcabiHty (A) As heretofore explained, according to the present invention, the layers to be sealed of a plastic sheet, facing with each other can be pressed and sealed certainly. (B) Moreover, according to the present invention, it is possible to accurately measure the temperature of the sealant material at the time of actually fusing the plastic. The temperature of the sealant material can be measured accurately at the time of actuaUy fusing the plastic sheet comprising the packaging material, or the Hke. That is, by determining the seaHng condition, using the sealant material temperature at the time of actually fusing the plastic sheet comprising the packaging material, or the Hke, a certain seaHng operation can be enabled.

Claims: CLALMES (1) A seaHng device for a packaging material for overlapping layers to be sealed of plastic sheets, facing with each other, pressuring the same from the outside with a sealing bar, and pressing the layers to be sealed in a melting state by a predetermined seaHng width so as to be sealed, comprising: a Hnear seaHng device for pressuring the layers to be sealed of the plastic sheets are pressured with a seaHng bar having a width narrower than the seaHng width, and pressuring the layers to be sealed in a heated state, and a surface seaHng device disposed subsequent to the Hnear seaHng device, for pressuring the layers to be sealed of the plastic sheets including the part pressured by the Hnear seaHng device with a seaHng bar having a width necessary for seaHng by a seaHng width, and pressing the layers to be sealed in a melting state. (2) A seaHng device for a packaging material for overlapping layers to be sealed of plastic sheets, facing with each other, pressuring the same from the outside with a seaHng bar, and pressing the layers to be sealed in a melting state so as to be sealed, comprising: a Hnear seaHng device for pressuring the layers to be sealed of the plastic sheets are pressured with a seaHng bar having a width narrower than the seaHng width, and pressuring the layers to be sealed in a heated state, a surface seaHng device disposed subsequent to the Hnear seaHng device, for pressuring the layers to be sealed of the plastic sheets including the part pressured by the Hnear sealing device with a seaHng bar having a width necessary for seaHng by a seaHng width, and pressing the layers to be sealed in a melting state, and a cooHng seaHng device disposed subsequent to the surface seaHng device, for pressuring the layers to be sealed of the plastic sheets including the part pressed by the surface seaHng device with a cooHng seaHng bar so as to cooHng and soHdifying in the pressed state of the layers to be sealed. (3) The seaHng device for a packaging material according to claim 1 or 2, wherein the melting temperature of the layers to be sealed of the • plastic sheets at the time of pressing by the surface seaHng device is an extrapolated melting end temperature or more of the plastic comprising the layers to be sealed. (4) The sealing device for a packaging material according to claim 2, wherein the melting temperature of the layers to be sealed of the plastic sheets immediately before pressing by the cooHng seaHng device is an extrapolated melting end temperature or more of the plastic comprising the layers to be sealed. (5) Measuring method for fusion temperature of plastics by measuring the temperature with a temperature measuring contact comprising a thermometer mounted on a fused part of a plastic. (6) Measuring method for fusion temperature of plasti.es according to claim 5, wherein the thermometer is a thermoelectric thermometer. (7) Measuring method for seaHng temperature of a plastic sheet by measuring the temperature with a temperature measuring contact comprising a thermometer mounted on a seaHng surface of the layers to be sealed at the time of fusing and seaHng layers to be sealed of plastic sheets, facing with each other. (8) Measuring method for seaHng temperature of a plastic sheet according to claim 7, wherein the thermometer is a thermoelectric thermometer.

Inventors: KIKUCHI MASAMI, KOTANI YASUAKI, NAKANISHI NOZOMU, OKAZAKI TOSHIKI, SHIMAMOTO KAZUO, UCHIKURA SHOJI, KIKUCHI, MASAMI, KOTANI, YASUAKI, NAKANISHI, NOZOMU, OKAZAKI, TOSHIKI, SHIMAMOTO, KAZUO, UCHIKURA, SHOJI
Applicants: KAO CORP, KIKUCHI MASAMI, KOTANI YASUAKI, NAKANISHI NOZOMU, OKAZAKI TOSHIKI, SHIMAMOTO KAZUO, UCHIKURA SHOJI, KAO CORPORATION, KIKUCHI, MASAMI, KOTANI, YASUAKI, NAKANISHI, NOZOMU, OKAZAKI, TOSHIKI, SHIMAMOTO, KAZUO, UCHIKURA, SHOJI
Application year: 2001
Main classification: B29C65
IPC codes: B29C65