Transport roller for the vacuum treatment of substrates
A transport cylinder for the vacuum treatment of substrates includes a roll body and at least one spacer element arranged on the roll body and enveloping the roll body. The spacer element is made of a knitted tube containing metallic or/and metallic threads.
1. Transport roller for transporting planar substrates through a vacuum treatment system, comprising a roll body extending along a central longitudinal axis and having a cylindrical exterior surface, the roll body including a groove, the groove having a base spaced inwardly of the cylindrical exterior surface of the roll body and the groove surrounding an entire circumference of the roll body, and at least one spacer element arranged on the roll body and enveloping the roll body, wherein the at least one spacer element comprises a knitted tube containing metallic or/and ceramic threads elastically held on the roll body, wherein the at least one spacer element comprises at least one rolled up section of the knitted tube, the at least one rolled up section being arranged in the groove and having an exterior diameter greater than an exterior diameter of the cylindrical exterior surface of the roll body, and the at least one rolled up section in the groove having a spiral cross-section in a plane extending along said longitudinal axis.
2. Transport roller according to claim 1 , wherein the spacer element is ring-shaped.
3. Transport roller according to claim 1 , wherein the knitted tube has the rolled up section at both ends of the tube.
4. Transport roller according to claim 3 , wherein the knitted tube includes a middle unrolled section arranged at the base of said groove.
5. Transport roller according to claim 3 , wherein the knitted tube includes a middle unrolled section forming an exterior diameter of the spacer element.
6. Transport roller according to claim 3 , wherein every rolled up section of the knitted tube is arranged in a respective groove of the roll body having a base spaced inwardly of the cylindrical exterior surface of the roll body, and an unrolled section of the knitted tube between two rolled up sections of the knitted tube rests on the cylindrical exterior surface of the roll body.
7. A method of protecting a transport roller against unwanted coating and/or overheating and/or protecting substrates from being damaged during vacuum treatment of substrates, comprising:
deploying a knitted tube containing metallic or/and ceramic threads as a spacer element of the transport roller in accordance with claim 1 , and vacuum treating the substrates.