| abstract |
Method and apparatus for applying seals made of thin material to the open tops of containers, e.g., specimen containers for holding biological fluid that are processed automatically. A measured length of sealing material is advanced across and pressed against the top of the container (20) to effect a seal. Depending on the type of sealing material used, sealing may be accomplished by application of pressure alone, by application of heat and pressure, or by application of ultrasonic energy and pressure. Excess sealing material optionally may be folded against the container sides by means of a folding member adapted to surround a container (20) when the sealing head is lowered. Motor-driven rollers advance the sealing material, while a platen (854) on a movably mounted sealing head presses the sealing material into engagement with the container. |