Method for the regulation of the temperature of the heated air in an apparatus for the hot-air pasting of plastic films

• US 6,238,326 B1
• Filed: 04/27/1999
• Issued: 05/29/2001
• Est. Priority Date: 04/27/1998
• Status: Expired due to Term

• Current Assignee: Starlinger & Company GmbH, Windmoller & Holscher
• Original Assignee: Starlinger & Company GmbH, Windmoller & Holscher
• Inventors: Burger, Jan, Henze, Rainer, Starlinger-Huemer, Franz X.
• Primary Examiner(s): Vo, Peter
• Assistant Examiner(s): TAWFIK, SAMEH
• Application Number:
  US09/300,565
• Time in Patent Office: 763 Days
• Field of Search: 493/3, 493/5, 493/8, 493/37, 493/219, 493/332, 493/334, 493/331, 493/265, 493/264, 53/76, 53/75, 219/494, 219/388, 156/64, 156/359, 156/378, 374/153
• US Class Current: 493/3
• CPC Class Codes: B29C 2793/0081 before shaping
• CPC Class Codes: B29C 65/103 direct heating both surfaces to be joined
• CPC Class Codes: B29C 65/7847 using vacuum to hold at least one of the parts to be joined vacuum work holders in general B25B11/005
• CPC Class Codes: B29C 66/0244 Cooling
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/43121 Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags closing tube ends B29C57/10
• CPC Class Codes: B29C 66/472 said single elements being substantially flat
• CPC Class Codes: B29C 66/7392 characterised by the material of at least one of the parts being a thermoplastic
• CPC Class Codes: B29C 66/83413 cooperating rollers, cylinders or drums
• CPC Class Codes: B29C 66/83417 said rollers, cylinders or drums being hollow
• CPC Class Codes: B29C 66/8511 Bag making machines
• CPC Class Codes: B29C 66/91216 enabling contactless temperature measurements, e.g. using a pyrometer
• CPC Class Codes: B29C 66/91221 of the parts to be joined
• CPC Class Codes: B29C 66/91231 of the joining tool
• CPC Class Codes: B29C 66/9141 by controlling or regulating the temperature
• CPC Class Codes: B29C 66/961 involving a feedback loop mechanism, e.g. comparison with a desired value
• CPC Class Codes: B29C 69/006 rotating transfer means
• CPC Class Codes: B29L 2031/7129 open
• CPC Class Codes: B31B 70/84 Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
• CPC Class Codes: B31B 70/85 Applying patches or flexible valve inserts, e.g. applying film-like valves

Abstract

To regulate the temperature of the heated air in an apparatus for the pasting of plastic films having a rack having a table over which the workpieces are conveyed continuously by a conveyor apparatus, having a conveyor roller pair disposed in a gap of the table top and supported in the rack, consisting of a lower counter-pressure roller and an upper suction cylinder, having a conveyor cylinder acting together with the suction cylinder which successively transfers sections to the suction cylinder, and having a broad-slit nozzle directed to the roller gap which blows in a controlled manner heated air to the roller gap, the temperature directly after the pasting of the pasted region of the workpiece at which a good pasting occurs is determined as the nominal value and the temperature of the heated air is regulated to this nominal value.

Claims

1. A method for regulation of temperature of heated air in an apparatus for pasting of plastic film,

comprising the steps of

arranging a rack with a table (1) over which workpieces (2) are conveyed continuously by arranging a conveyor device therewith;

disposing a conveyor roller pair (4,5) in a gap (3) of the table top (1) and supported in the rack and forming a roller gap essentially flush with the table surface and having a lower roller (4) which is a counter-pressure roller and an upper roller which is a suction cylinder 5;

arranging a conveyor cylinder (7) to interact with the suction cylinder (5) which successively transfers sections (8) of the plastic film to the suction cylinder (5);

directing a broad-slit nozzle (30) to the roller gap to blow heated air into the roller gap in a controlled manner,

determining temperature directly after pasting of a pasted region of the workpiece at which a good pasting is performed as a nominal value; and

regulating the temperature of heated air to this nominal value.

2. A method in accordance with claim 1, comprising the additional steps of measuring the temperature of the pasted region of the workpiece as an actual value directly after the pasting and increasing or decreasing the temperature of the heated air until the actual value of the measurement corresponds to the nominal value.

3. A method in accordance with claim 2 comprising the step of measuring temperature of the pasting apparatus and pre-adjusting the temperature of the heated air corresponding to this measured temperature.

4. A method in accordance with claim 1, comprising the additional step of measuring temperature of the pasting apparatus and pre-adjusting the temperature of the heated air corresponding to this measured temperature.

5. A method in accordance with claim 1, comprising the step of applying sections (8) of plastic film to flat-lying work pieces (2) of plastic film.

6. A method in accordance with claim 4, comprising the step of applying valve sections to bottom squares or bottom covers to added bottoms of cross bottom valve sacks.

7. A method in accordance with claim 6, comprising the step of measuring temperature of the pasting apparatus and pre-adjusting the temperature of the heated air corresponding to this measured temperature.

8. A method in accordance with claim 5, comprising the step of measuring temperature of the pasting apparatus and pre-adjusting the temperature of the heated air corresponding to this measured temperature.

9. A method according to claim 1, comprising the steps of measuring the pasted region of the workpiece immediately downstream of the gap (3) of the rollers with a pyrometer arranged in the rack at a predetermined distance above the workpiece, and

feeding signals from the pyrometer to a control and regulation unit which correspondingly increases or decreases temperature of the heated air blown out of the nozzle (30) to the nominal temperature of the pasted region.

10. A method according to claim 9, comprising the step of

measuring temperature of the table (1) immediately after the gap (3) of the rollers (4,5) as said nominal value.

11. A method according to claim 10, comprising the additional step of

arranging a sensor (45) on the table and directing the signal to the control and regulation unit.

12. A method according to claim 11, comprising the additional steps of measuring temperature of a heating unit or air heated by the same and which is fed to the nozzle (30), with a temperature sensor, and

directing a measured temperature signal from the sensor along a signal line to the control and regulating unit.

13. A method according to claim 9, comprising the additional steps of measuring temperature of a heating unit or air heated by the same and which is fed to the nozzle (30), with a temperature sensor, and

directing a measured temperature signal from the sensor along a signal line to the control and regulating unit.

14. A method according to claim 10, comprising the additional steps of measuring temperature of a heating unit or air heated by the same and which is fed to the nozzle (30), with a temperature sensor, and

directing a measured temperature signal from the sensor along a signal line to the control and regulating unit.

15. A method according to claim 1, comprising the step of

measuring temperature of the table (1) immediately after the gap (3) of the rollers (4,5) as said nominal value.

16. A method according to claim 15, comprising the additional step of

arranging a sensor (45) on the table and directing the signal to a control and regulation unit which correspondingly pre-adjusts temperature of the heated air blown out of the nozzle.

17. A method according to claim 16, comprising the additional steps of measuring temperature of a heating unit or air heated by the same and which is fed to the nozzle (30), with a temperature sensor, and

directing a measured temperature signal from the sensor along a signal line to the control and regulating unit.

18. A method according to claim 15, comprising the additional steps of measuring temperature of a heating unit or air heated by the same and which is fed to the nozzle (30), with a temperature sensor, and

directing a measured temperature signal from the sensor along a signal line to a control and regulating unit which correspondingly increases or lowers the temperature of heating elements with the heating unit.

19. A method according to claim 1, comprising the additional steps of measuring temperature of a heating unit or air heated by the same and which is fed to the nozzle (30), with a temperature sensor, and

directing a measured temperature signal from the sensor along a signal line to a control and regulating unit which correspondingly increases or lowers the temperature of heating elements with the heating unit.