Multi-channel capillaries

The cross-sections of multi-channel capillaries consist of a large number of single holes, which are either in a random order or neatly arranged. Depending on the application in which these capillaries are used they can fulfill several tasks.

Materials

  • Soda-lime glass (AR, I860, PH360 etc.)
  • Borosilicate glass (DURAN©, PYREX©, SIMAX© etc.)
  • Aluminum silicate glass (Schott 8252/8253)

Process of Production

Two different production methods are used to manufacture multi-channel capillaries:

 

1. Production from a preform

Prior to drawing the capillary several performs are mounted and joined together. During this process the channels are created from a single capillary. Hollow spaces are then filled with glass rods and are evacuated with heat. All unintended side channels and hollow spaces between the capillaries are sealed during this process and result in a closed cross-section, which is only punctuated with the inner geometry of the single capillaries. Reproducible profile sizes, concerning the entire diameter as well as the inner diameter of the single capillaries, can be manufactured by using thick walled capillaries. In this case, however, the closed area is partial larger than the area of the holes. The use of thin-walled capillaries for the production of the perform results in an airy structure with less closed and more free areas in the cross-section. Using thin walls the capillaries tend to deform more easily inside and are therefore not particularly suited for the production of precise inner geometries.

 

2. Production by laminating with epoxy resin

The second process used to produce multi-channel capillaries is laminating single capillaries with epoxy resin. This method is applied when environmental parameters, such as high temperatures or solvent resistance, do not require the use of a mere glass construction but a high accuracy of the inner diameter. In this process single capillaries are joined to an array/bundle. Hollow spaces between the capillaries are filled with an acrylate- or epoxy-based resin and cured with UV light. Various adhesives may be used depending on the application.

Dimensions

  • Length: 1 - 1060 mm
  • Outer-Ø: 1 - 8 mm
  • Inner-Ø: 0,05 - 0,6 mm

Design

There are several options for the ends of the capillaries:

  • circular cut
  • abrasively cut
  • faceted
  • one-sided closed
  • Quantity of channels: 2 - 500

Industries/Applications

  • Sifters
  • Laminary flow
  • Multi-channel micropipettes (Patch Clamp)
  • Perfusion pipettes
  • Microfluidic systems
  • Restrictor
  • Spacer
  • Glass tube with side-opening
  • Glass fibers with sphere formed end
  • NMR Tubes with thread for low vacuum applications
  • Mark tubes with special inner surface
  • Mini test tubes with extended flange
  • New preform for redrawing of capillaries
  • Test tubes with sagging at the bottom
  • Cloning cylinders with numbering
  • Large-volume theta cross-section capillaries
  • High tightness with new standard cap
  • Complex component made of quartz glass
  • Dropper pipettes in many sizes and designs
  • Packing glasses protected from light
  • Ampoules with built-in test leckage
  • Thick-walled sample vessels
  • Measuring ampoules with conical bottom
  • Special glass capillaries for measurements
  • Glass capillaries with constriction
  • Finely scaled glass cannulas
  • CNC processing of glass plates
  • New 5 mm NMR standard caps
  • Glass crucible for thermal analyses
  • Glass capillaries with graduation
  • Square capillary with 9 internal channels
  • 9-fold capillary made of borosilicate glass 3.3
  • Our tool for cutting glass capillaries
  • Diamond wire for cutting capillaries
  • Sight glasses (laser structured)
  • Very thick-walled capillaries
  • Polyimide coated filling needles
  • Ampoules with small volume
  • NMR tubes colored (UV protection)
  • NMR septum caps (increased denseness)
  • NMR tubes (barcode & constriction)
  • Mark tubes with perforated bottom
  • Test tubes with hole e.g. as vent
  • Test tubes with grooved rim
  • Oval capillaires (thin-walled)
  • Triangular capillaries (thin-walled)
  • Twisted capillaries by hot forming
  • Multi-channel capillaries (circular array)
  • Special light pipe made of glass
  • Luggin-capillary for measurements
  • Test mandrels (different materials)
  • Carpoules with special-rolled rim
  • Glass capillary for the stimulation
  • XRD-capillary with Luer-connector
  • Glass nozzle with seal-and retaining ring
  • Glass capillary with side-mounted connectors
  • Easily destructible glass ampoules
  • Glass rods with surface patterning
  • Long-conical focusing nozzles
  • Surface patterning of glass substrates
  • Laser sublimation-drilling in flat capillaries
  • Thin needles up to 180 ° flexible
  • Glass needles with curved tip
  • Polished to precision glass rings
  • Glass rods with partially-frosted surface
  • Sealing glass with high thermal expansion