| 摘要 |
FIELD: packaging industry.SUBSTANCE: invention relates to an elastomeric cap which is used to seal the test tube, but provides access of the pipette to the fluid contained in test tube. The cap comprises an annular flange part for sealing the test tube and the sloping part of the truncated cone for facilitated directing the pipette into the test tube. The part of the tubular sealing, connected to the flange part and the part of the truncated cone is made so that it surrounds the part of a truncated cone and with ease of inserting it tightly engages the inner wall of the test tube. The part of the central valve connected to the part of the truncated cone at its upper surface is surrounded by a gutter for puncturing by the pipette and has a flexible part. The part of the central valve is separated along the perimetre of the gutter, but over the flexible part it pivotally leans back on the gutter and is not separated. The diameter ratio of the pipette and the part of the central valve is such that during transfer of fluid contained in test tube there are no problems connected to the backpressure and vacuum conditions.EFFECT: improved performance characteristics.18 cl, 14 dwg |
