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Methods of forming unitary serological pipettes

A pipette and cavity technology, applied in the field of forming an integral serological pipette, can solve the problems of increased parts cost, increased manufacturing time, material waste and the like

Active Publication Date: 2020-01-07
CORNING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, conventional cutting techniques lead to increased manufacturing time, lead to wasted material and lead to increased part cost

Method used

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  • Methods of forming unitary serological pipettes
  • Methods of forming unitary serological pipettes
  • Methods of forming unitary serological pipettes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0060] according to Figure 7 The blow molding method shown for integral pipettes, manufactures 10ml and 25ml pipettes. The cold preform is inserted into the blow mold and pressurized (10 psi to 20 psi), then heated with radiant heat from the mould. The process takes approximately 40 minutes to heat the mold, expand the mold and cool the mold. Remove parts and measure.

[0061] Table II shows the inner diameter (ID), outer diameter (OD) and thickness measurements (in mm) of the tip portion, body portion and spout portion of these experimental pipettes.

[0062] Table II

[0063]

[0064] As can be seen from Table II, the tip and spout thicknesses of the experimental pipettes manufactured by blow molding were greater than the body thickness. These measurements are consistent with the thicknesses expected using modeling.

[0065] Table III shows the modeling using blow molding (according to Figure 7 expected measured value for the method shown). The calculated final d...

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PUM

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Abstract

A method for producing pipettes (110, 111, 112) is provided. The method includes the steps: extruding a polymer melt into at least one mold segment of a mold assembly (120) having a plurality of moldsegments to form a parison (50) or preform, wherein the plurality of mold segments (122) comprise cavities (42) that are shaped to form pipettes when in communication with the cavity of an adjacent mold segment; forming at least two pipettes in the shape of the mold segment cavities by blow-molding or vacuum forming the parison or preform, each of the at least two pipettes having proximal and distal ends; heating the pipettes to form a locally heated portion of the at least two pipettes; and separating the pipettes by cutting the locally heated portion of the at least two pipettes with separation feature (64, 66, 194, 196).

Description

[0001] This application claims the benefit of priority to U.S. Provisional Application Serial No. 62 / 511,124, filed May 25, 2017, which is based upon the contents of that application and is incorporated by reference in its entirety as if fully set forth below. technical field [0002] The present disclosure generally relates to monolithic serological pipettes and methods of forming them, such as blow molding or vacuum forming. Background technique [0003] Serological pipettes are used in both research laboratories and manufacturing plants to transfer liquid volumes, typically less than about 1.0 ml up to about 100 ml. While some pipettes are formed of sterilizable glass and are reusable, most pipettes are formed of sterile plastic and are disposable. [0004] Although there are various known methods of assembly, these plastic pipettes can be made from polymers by known techniques such as injection molding, profile extrusion, rotational molding, thermoforming, casting, melt ...

Claims

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Application Information

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IPC IPC(8): B29C49/04B29C49/42B29C49/36B29C49/50B29L31/00B29K25/00B29K23/00B29C49/24
CPCB29L2031/753B29K2023/12B29K2025/06B29C49/04B29C49/36B29C49/4268B29C49/4278B29C49/50B29C2049/2412B29C2793/0027B29C2793/009B01L3/021B01L2200/12B29L2023/007B01L2300/0832B01L2300/0858B29C49/24
Inventor J·C·小卡多特M·K·谢弗J·M·塞莫尔A·M·泽曼
Owner CORNING INC