Your browser version is outdated. We recommend that you update your browser to the latest version.

A Proudly Canadian Corporation  Serving the pulp, paper, and board industry for three generations     

Zero-Span : the ONLY direct measure of fibre strength.

A Brief History

Pulmac Inc was incorporated in 2003 and, in 2012, became a founding shareholder in Pulmac Systems International Inc of Williston, Vermont. Pulmac Inc was responsible for all manufacturing and service until it formally broke with Pulmac Systems in May, 2015. Changing its name to QS Fibre Inc in 2016, the Montreal-based company  offers the  AutoScan for on or off-line determination of fibre, shive, and fines size distributions as well as competitive products and services for :

  • Pulmac MasterScreen, Z-Span Tester, Automated Sheet Former, Beater, and Dewatering Device.
  • Provisioning of testing services, in-mill service support, and mill studies

QS Fibre is owned and  operated by Brent Cowan, son of Wavell Cowan and grandson of inventor, industrialist and Pulmac patriarch, Eli Cowan.

W. Brent Cowan, CD MSc


QS Fibre : Committed to integrity

Atholville NB Pulp MillAtholville NB Pulp Mill



QS Fibre Zero-Span TesterQS Fibre Zero-Span TesterDescription

The QS Fibre Zero-Span Tester offers an automated zero and short span testing capability. Once the sample is loaded onto the feed tray, 24 wet/dry, zero/short span tests are completed during a five-minute test cycle. After the testing sequence, test results are displayed on the operator interface terminal and can automatically update a local  PC-based Excel database.  The QS Fibre Zero-Span Tester is calibrated and communications software is integrated at system installation.


The QS Fibre Zero-Span Tester can  effectively define a pulp’s strength. Numbers generated by the Zero-Span Tester will alert mill monitors to creeping process changes before pulp quality trends past control limits. QS Fibre zero-span testing helps keep production running smoothly and mill customers happy. Direct improve-ments to productivity include re-ducing down-graded pulp, penalty payments, and warehousing costs - all the while improving communication links with pulp users. The QS Fibre Zero-Span Tester is an excellent and flexible device to calibrate on-line assessments of pulping and stock prep step processes. Operators can easily maintain an overwatch of thefibreline, stock prep and furnish to quickly detect and troubleshoot upset conditions before severaltonnes of production at the reel are lost to off-target quality and broke.

Plug and Play Technology
This computerized, bench-top zero-span tester is delivered to the customer factory-calibrated and ready-to-go after a very simple unpacking and re-assembly procedure.
Its simple touch-screen operator interface allows the rapid, precise, and repeatable generation of key fibre quality numbers.

Hardware Features
Rugged construction - two year limited  warranty
Clamping surfaces are rustproof, superhard, machine tool material.
Electronic operator interface

Software Features
Password-protected system manager access to set-up menus
Data stored locally on a flash drive to be exported to a PC Excel database.
Custom data dictionary and rogue data reject setting