Claims
- 1. A heat sealing bar for mounting transverse to a tube formed by sealing a web-line packaging material in a longitudinal direction, and for forming a seal laterally across the tube, said heat sealing bar comprising:
- (a) a slender block-like bar body;
- (b) an insulating layer formed on a surface of said bar body;
- (c) a flat heating ribbon fixed on a surface of said insulating layer along the entire length of said bar body and means for supplying a pulse of electric current to said heating ribbon to thereby generate heat within the heating ribbon; and
- (d) cooling means for cooling said heat sealing bar;
- (e) heat pipe means, including a heat pipe embedded in said bar body between said insulating layer and said cooling means and extending longitudinally along said heating ribbon, for transferring heat longitudinally in said heating ribbon from a portion of said heating ribbon operating under small thermal load to a portion of said heating ribbon operating under a larger thermal load.
- 2. A heat sealing bar according to claim 1, wherein said bar body is made of metal.
- 3. A heat sealing bar according to claim 1, wherein said insulating layer is made of chromium oxide.
- 4. A heat sealing bar according to claim 1, wherein said heating ribbon is made of nickel alloy.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-105383 |
May 1993 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/532,792, filed Oct. 17, 1995, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
9108954 |
Jun 1991 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Patent Abstracts of Japan, vol. 17, No. 212, 26 Apr. 1993. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
532792 |
Oct 1995 |
|