PIPETTE WITH ENCAPSULATED OR INTEGRAL FILTER, AND METHOD AND APPARATUS FOR FORMING SAME

Measuring pipettes including integral or encapsulated filters, as well as methods and apparatuses for forming the same, are provided. A filter material (e.g., a discrete element in solid form) or a filter material precursor (e.g., a foamable thermoplastic composition and a blowing agent) to be introduced into a hollow interior of a softened thermoplastic material present within a mold during pipette fabrication. A pipette includes a filter element comprising foamed polymeric material within a mouthpiece region, wherein an outer portion of the filter element is bound to or encapsulated in an inner wall of the mouthpiece region. A filter material precursor may be supplied coaxially with a tubular flow of thermoplastic material into the mold, may be supplied laterally through a mold wall, ormay be injected into a molten thermoplastic pipette forming material upstream of an extruder outlet. 提供了包括一体式或封装的过滤器的测量移液器，以及其形成方法和设备。在移液器制造期间，将过滤器材料(例如，固体形式的离散元件)或过滤器材料前体(例如，可流动的热塑性组合物和发泡剂)引入到模具中存在的经软化的热塑性材料的中空内部中。移液器包括过滤器元件