Industrial Inkjet Ink Capsule Filter, N/S Series

Ink is an awkward fluid to filter. The pigment is the product, not the contaminant, so the filter has to pull out agglomerates and stray fiber while leaving the dispersion intact — and it has to do that without shedding anything of its own into a fluid heading for a printhead worth more than the filter by three orders of magnitude.

This cartridge is built on Pullner’s capsule platform: media, cage and connections welded into one sealed body, with no housing to open and no elastomer seal in the flow path. The body is 72 mm across in five lengths from 114 mm to 202 mm, with 1/4", 3/8" or 1/2" connections in NPT thread or Swage compression fitting, and it is available in four media so the element can be matched to the carrier rather than the other way round.

Características principales

• Four media on one body — PP, glass fiber, PES and PTFE
• No elastomer in the flow path — welded body removes the solvent-compatibility question at the seal
• Clean change-out — replaced whole, no open bowl beside the press
• Pleated internal element — 1–10 GPM from a 72 mm body
• Five lengths — 114, 138, 152, 183 and 202 mm
• Six connection options — 1/4", 3/8", 1/2" in NPT or Swage
• ISO 9001 manufacture with batch test documentation on request

Aplicaciones

• Industrial inkjet: ink filtration ahead of the printhead.
• Pigment dispersions: agglomerate and fiber removal without stripping the dispersion.
• Coating fluids: particle control on coating and laminating lines.
• Solvent-carrier inks: PTFE media where PP and PES are not compatible.
• Water-based inks: PP media as the standard specification.

Media Selection

The media choice is driven by the carrier, not the pigment. Getting it wrong shows up either as a filter that dissolves or as color stripped out of the fluid it was supposed to be cleaning.

Compatibility depends on the specific carrier, its concentration and its working temperature rather than on the material name alone. Send the ink data sheet with your inquiry and Pullner will confirm the media before quoting.

A note on grade

On ink duty the useful grade is usually set by the printhead nozzle rather than by the specification of the fluid. A common working rule is to filter an order of magnitude finer than the smallest nozzle passage, then confirm against the ink manufacturer’s own guidance, since over-filtering a pigment dispersion removes product rather than contamination.

Design & Construction

The capsule is thermally welded shut. There is no housing joint to seal and no elastomer anywhere in the flow path, which is why the seal row in the specification table is empty. On a solvent line that removes a real problem: the O-ring is both a compatibility question and a bypass risk every time it is reseated.

It also changes what a change-out looks like. The capsule is replaced whole, so there is no open bowl, no drip tray and no half-drained housing sitting next to a press. The trade is that nothing is serviceable — when differential pressure reaches its limit, the whole unit goes.

Inside the welded body the element is pleated rather than depth-wound. That is what lets a 72 mm body pass 1 to 10 GPM; a depth wrap in the same envelope would blind far sooner.

Non-standard sizes and connections

Every combination of cage diameter and connection adaptor is a separate mold. Pullner cuts those in-house and prototypes non-standard end caps and frames on a 3D printer first, so unusual geometry is generally possible — but it is a tooling conversation rather than a catalog selection, and it moves the lead time. Send the dimensions and the fitting standard with your inquiry and engineering will tell you whether an existing mold covers it.

Replacing an Imported Capsule

Most inquiries come from press rooms already running an imported capsule that has become slow to source or expensive to hold. Cross-referencing one needs six things, and an inquiry carrying all six is usually quoted the same day:

• The part number printed on the capsule body
• Body diameter and overall length
• Inlet and outlet fitting — thread standard or tube size
• Micron grade currently in service
• The ink or carrier, and its working temperature
• Flow rate and the change-out interval you are getting today

Photographs of the capsule and its fittings help more than a description.

Qualifying the replacement

Every element is tested in Pullner’s own laboratory, from incoming raw material to finished goods, on a bench that includes a PMI pore size analyzer, an SEM resolving to 3 nm, ICP-MS, an ion chromatograph and an IFTS single-pass rig. Batch test documentation is available on request.

Up to two samples ship worldwide free of charge, with freight paid by the customer. Standard minimum order is 50 pieces and standard lead time is 10 working days, across 30+ production lines running more than 4,000 elements a day.

Who it is for

Process engineers and maintenance teams on industrial inkjet printing and coating lines who filter ink ahead of the printhead. Not intended for desktop or office printers.

Typical operating conditions

• Micron rating: 1–10 µm
• Media: polypropylene (PP), glass fiber, PES or PTFE
• Flow: 1–10 GPM
• Max differential pressure: 60 psi (4.1 bar)
• Max temperature: 122°F (50°C)
• Body: 72 mm diameter (customized sizes available); lengths 114, 138, 152, 183 or 202 mm
• Inlet / outlet: a range of adaptor options, including 1/4" NPT, 3/8" NPT, 1/2", 1/4" Swage, 3/8" Swage and 1/2" Swage; other sizes need a new mold
• O-ring / gasket: not applicable (capsule format)

Recommended Pullner product family

Capsule filter elements, N/S series. Media is matched to the ink carrier. For duty finer than 1 µm, review cartuchos filtrantes de membrana.

What to send before quotation or sample

• Fluid / media
• Flow rate
• Micron rating
• Temperature
• Pressure
• Existing housing or current model
• Maintenance / change-out cycle
• Validation requirement

Get Quote · Request Sample · Send Current Model · Ask Engineering

Can the N/S capsule replace the ink filter on our press?

It is a second-source candidate when body diameter, length and inlet/outlet adaptor match your ink line. Connections come in a range of NPT and Swage adaptor options, and a new size needs a new mold. Send the part number, dimensions and fitting. Performance on your ink is confirmed only after a sample run.

How is it validated before switching?

A fit check on dimensions and adaptors comes first, then media compatibility against your ink data sheet, then a sample run on the press. Track differential pressure, change-out interval and print quality against the filter in service before scaling the order.

What data or documentation is available?

This page publishes micron rating, media, dimensions, flow, pressure and temperature limits. Pullner manufactures under ISO 9001 and tests membranes in-house on an SEM resolving to 3 nm. Ask engineering which batch records can accompany your sample and order.

What are the limits on temperature, pressure and chemistry?

Maximum temperature is 122°F (50°C) and maximum differential pressure is 60 psi (4.1 bar). Flow is 1–10 GPM per capsule. Solvent carriers need the media confirmed first: compatibility depends on the carrier, its concentration and temperature, not on the material name alone. Liquid service only.

Is this a filter cartridge for digital ink?

Yes, for industrial digital inkjet printing and coating lines. The media is chosen by the ink carrier: send the ink data sheet and Pullner confirms PP, glass fiber, PES or PTFE before quoting. It is built for production presses, not desktop printers.

What is the minimum order and lead time?

Standard minimum order is 50 pieces and standard lead time is 10 working days. Non-standard body sizes or adaptors need a new mold, which changes the lead time, so send dimensions and fitting standard with the inquiry.