Category Archives: TAPPI

TAPPI T 456 om-15

Tensile breaking strength of water-saturated paper and paperboard ("wet tensile strength")

Published by: 2015-01-01 / 2015-01-01 / 6 pages
This method describes the procedure for the determination of the tensile strength of paper and paperboard after saturation with water.

This procedure is applicable to papers and paperboard (excluding corrugated board) that will be subjected to stress while wet, either during processing or use. Such materials include but are not limited to papers used in map-making, photography, and blue prints, bags and food wraps. Previous versions of this method (om-10 and earlier) included tissue and towel products in its scope; however, the scope now excludes these products, since other test methods are available, and are recommended since they are more specific and appropriate for quantifying the wet tensile properties.

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TAPPI T 1008 sp-15

Test Conditions for Fiber Glass Mat Test Methods

Published by: Technical Association of the Pulp and Paper Industry / 2015-05-12 / 2 pages
This method defines the test conditions for testing fiber glass mats.

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TAPPI UM 253

Laboratory processing of pulp (ball or pebble-mill method)

Published by: Technical Association of the Pulp and Paper Industry / 2015-04-01 / 4 pages
This method concerns the processing of pulp by means of a laboratory ball or pebble-mill prior to forming
handsheets for determining pulp behavior when subjected to beating [see also TAPPI T 200 “Laboratory Processing
of Pulp (Beater Method),” TAPPI T 248 “Laboratory Beating of Pulp (PFI Mill Method),” UM 221 “Laboratory
Processing of Pulp (Plate Refiner),” and UM 258 “Laboratory Processing of Pulp (Kollergang Method)”]. Only the
furnishing and processing of the stock and the withdrawal and dilution of samples are described. The forming of
sheets is described in TAPPI T 205 “Forming Handsheets for Physical Tests of Pulp,” their physical testing in
TAPPI T 220 “Physical Testing of Pulp Handsheets,” and their classification in TAPPI T 233 “Fiber Length of Pulp
by Classification.”

This method has the advantage of small specimen size and good reproducibility of beating action.

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TAPPI TIP0416-11

Recommended test procedure for black liquor evaporators

Published by: Technical Association of the Pulp and Paper Industry / 2015-03-31 / 20 pages
Procedures used to measure the performance of black liquor evaporators and concentrators have frequently produced inconsistent and confusing results. There are two underlying causes for this problem. One is a lack of understanding of how to measure work done by an evaporation system. The second is that no standard evaluation procedure is available.

This Technical Information Paper (TIP) establishes recommended test requirements for an accurate evaluation of black liquor evaporators. The evaluations discussed are for maximum rate evaluation, performance evaluation, and
troubleshooting. It further describes procedures to fulfill test requirements for each. A general understanding of
evaporators and the kraft chemical recovery cycle by the user is assumed.

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TAPPI UM 658

Color strength and shade of dye

Published by: Technical Association of the Pulp and Paper Industry / 2015-04-01 / 6 pages
The following methods are designed for the evaluation of dyes used for coloring paper in terms of a preselected dye referred to as the standard dye. These methods are most suited for the evaluation of dyes within a laboratory, since variations in pulps, water conditions, pH, and the observer will influence a correlation of data between laboratories. Method A is for soluble dyes and applies to dyes to be used solely for calender staining and other types of surface coloring. Method B is for soluble and insoluble colorants intended for beater applications.

Some acid dyes, e.g., Acid Yellow 23, Acid Yellow 36, and Acid Blue 9, cannot be evaluated by the beater dying method. However, the other acid dyes, basic dyes, and direct dyes may be evaluated by this method.

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TAPPI UM 411

Opacity of Paper Using 45 degree/0 degree Geometry Reflectometer

Published by: Technical Association of the Pulp and Paper Industry / 2015-04-01 / 4 pages
The object of this method is to determine paper opacity by measuring the ratio of the reflectance of paper backed by black and white using an instrument equivalent to the geometry of the TAPPI brightness measurement instrument. Approximate TAPPI opacity is measured by contrast ratio of the specimen reflectance backed by a black cavity to white backing of 89%. The term “approximate” is used to differentiate the TAPPI opacity measured with this procedure to the TAPPI opacity measured using an instrument that conforms to the measurement of opacity as specified in the geometry in T 425 “Opacity of paper (15/d geometry, illuminant A/2°, 89% reflectance backing and paper backing).”

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TAPPI UM 3

Determination of useful fiber in bagasse

Published by: Technical Association of the Pulp and Paper Industry / 2015-04-01 / 3 pages
This method describes a procedure for estimating the percentage of useful fiber, pith, and soluble matter in
bagasse.

Pith and fiber occur in bagasse closely adhered together. Both of them, after swelling in water, become
loose and can be effectively separated from each other by a washing and combining action on a sieve.

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TAPPI UM 258

Laboratory processing of pulp (Kollergang method)

Published by: Technical Association of the Pulp and Paper Industry / 2015-04-01 / 8 pages
This method concerns the processing of pulp by means of a laboratory beating device, the
Kollergang, prior to forming handsheets, for the purpose of determining its behavior when subjected to a definite
beating schedule [See also TAPPI T 200 “Laboratory Processing of Pulp (Beater Method),” TAPPI T 248
“Laboratory Beating of Pulp (PFI Mill Method),” UM 221 “Laboratory Processing of Pulp (plate refiner),” and UM
253 “Laboratory Processing of Pulp (Ball or Pebble-Mill Method”)]. Only the furnishing and processing of the stock
and the withdrawal and dilution of specimens are described in detail. Forming of the sheets is covered by T 205
“Forming Handsheets for Physical Tests of Pulp” and their physical testing by T 220 “Physical Testing of Pulp
Handsheets.”

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TAPPI UM 240

Shive content of mechanical pulp (laboratory flat screen)

Published by: Technical Association of the Pulp and Paper Industry / 2015-03-30 / 3 pages
The objective of this method is to determine the harmful shive content of mechanical pulps by screening on a
laboratory flat screen.

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TAPPI UM 566

Wetting Shipping Sack Paper for Testing

Published by: Technical Association of the Pulp and Paper Industry / 2015-03-23 / 2 pages
This method is applicable to the preliminary treatment of shipping sack paper prior to testing its properties when wet.

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