Claims
- 1. A method for heat sealing at least two coated paperboard substrates, wherein said method is comprised of the steps of:
- coating at least two paperboard substrate bases with a heat sealable polymeric coating;
- converging said coated paperboard substrates with a converging means such that said polymeric coatings on each of said at least two coated paperboard substrates are brought into contact with each other to form a sealing zone;
- emitting a gaussian energy distributed light energy beam from a light energy beam producing means;
- impinging said gaussian beam upon a light energy beam optical means to produce a uniform energy distributed light energy beam, wherein said light energy beam optical means is further comprised of: a copper, cylindrical, faceted focusing mirror; and
- impinging said uniform beam onto said sealing zone to soften said polymeric coatings and create a seal between said coated paperboard substrates.
- 2. The method, as in claim 1, wherein said converging means is further comprised of:
- at least two rollers having a pressure nip located substantially between said rollers.
- 3. The method, as in claim 1, wherein said light energy means is further comprised of:
- a laser.
- 4. The method, as in claim 3, wherein said laser is further comprised of:
- a CO.sub.2 laser.
- 5. The method, as in claim 4, wherein said CO.sub.2 laser has a power rating of 1700 Watts.
- 6. The method, as in claim 1, wherein said light energy beam optical means is further comprised of:
- a diffraction grating.
Parent Case Info
This application is a division of application Ser. No. 08/612,476, filed Mar. 7, 1996, now a U.S. Pat. No. 5,690,775.
US Referenced Citations (12)
Divisions (1)
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Number |
Date |
Country |
Parent |
612476 |
Mar 1996 |
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