US 12,337,521 B2
Method and apparatus for heating plastic preforms with absorption measurement
Simon Fischer, Regensburg (DE); Ulrich Lappe, Neutraubling (DE); and Stefan Schober, Tegernheim (DE)
Assigned to KRONES AG, Neutraubling (DE)
Filed by KRONES AG, Neutraubling (DE)
Filed on Dec. 2, 2022, as Appl. No. 18/074,328.
Claims priority of application No. 10 2021 134 262.7 (DE), filed on Dec. 22, 2021.
Prior Publication US 2023/0191688 A1, Jun. 22, 2023
Int. Cl. B29C 49/64 (2006.01); B29C 49/68 (2006.01); G01N 21/59 (2006.01); H05B 3/00 (2006.01); G01N 21/84 (2006.01)
CPC B29C 49/6418 (2013.01) [B29C 49/68 (2013.01); G01N 21/59 (2013.01); H05B 3/0057 (2013.01); G01N 2021/8411 (2013.01); H05B 2203/032 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for heating plastic preforms, wherein the plastic preforms are transported along a predetermined transport path and are heated during this transport by applying electromagnetic radiation, wherein an absorption and/or transmission of the plastic preforms is determined, at one location along the transport path, for radiation in an infrared wavelength range,
wherein
an absorption and/or transmission of the plastic preforms and/or of the plastic containers produced from these plastic preforms is also determined, at another location along the transport path, for radiation in a visible wavelength range, and wherein
at least one absorption and/or transmission is measured depending on the location, wherein a region of the plastic preform and/or the surface of the plastic preform is examined with regard to its absorption and/or transmission.