Patent ID: 8351030

Claim:
A method for producing a cuvette ( 1 ) or a receptacle vessel for liquid or gaseous media for spectroscopic qualitative or quantitative analysis or measurement using a measuring region or measuring gap ( 2 ) that can be penetrated by radiation made from plastic, comprising: injection molding liquid plastic into a multi-part injection mold ( 10 ), which comprises in an interior thereof a contour of the cuvette ( 1 ) or the receptacle vessel with an opening ( 3 ) and the measuring gap ( 2 ) in an injection molding device and, after the plastic has set, opening the injection mold ( 10 ) and removing the cuvette, and in the injection mold ( 10 ), forming and limiting an interior longitudinal cavity ( 9 ) and the measuring gap ( 2 ) at the interior using a contour core ( 11 ), which during the injection molding process is initially held by a support ( 14 ), a thickness of the contour core ( 11 ) in a region ( 11 a ) of the measuring gap ( 2 ) is limited to 1 millimeter or less, the contour core ( 11 ) is held by the support ( 14 ) at an end thereof comprising a smallest dimension, and an end of the measuring gap ( 2 ) facing away from the opening ( 3 ) or the vessel or the cuvette ( 1 ) is formed by removing or retracting the support ( 14 ) from the contour core ( 11 ) during the injection molding process, with the support ( 14 ) together with the end ( 11 b ) of the contour core ( 11 ) forming at its end a lower limit or continuation of the walls ( 6 ) of the measuring gap ( 2 ), and continuing the injection molding process during or after the removal or retraction of the support ( 14 ) until the hollow space released thereby has been filled, with the support ( 14 ) for the contour core ( 11 ) forming the measuring gap ( 2 ) being retracted in the direction of extension of the measuring gap ( 2 ) perpendicularly in reference to a later orientation of the radiation.