What is the Tappi scale?

The TAPPI Size Estimation Chart is a transparent chart used to measure the size of spots, defects, or inclusions over the range of 0.02 to 5.00 square millimeters in paper and other industrial materials such as textiles or plastics.

How do you use a Tappi chart?

Insert the microscope slide containing the dirt specks onto the microscope stage. Adjust the light aperture and focus via TAPPI chart instructions. Take a picture of the spec with the camera to create a photomicrograph. Save the photomicrographic image as a GIF or JPEG file onto the camera’s memory card.

What are the lines on a Tappi chart?

Q: What do the lines on the chart correlate to? A: The lines/rectangles are provided for approximate visual comparison and are not measured.

What is the meaning of Tappi?


Acronym Definition
TAPPI Technical Association of the Pulp and Paper Industry

What is full form of Tappi?

The Technical Association of the Pulp and Paper Industry (TAPPI) offers standards and technical information papers to measure, evaluate and describe paper and pulp products. TAPPI standards also apply to raw materials used in manufacturing and scientific investigations.

How do you test quality of paper?

Paper Quality Parameters – Traditional FineArt

  1. Raw Material Composition. The raw material composition determines to a large extent the quality of paper.
  2. Paper surface (appearance)
  3. Clarity, opacity and transparency.
  4. Sizing.
  5. Strength.
  6. Grammage and thickness.
  7. Grain.
  8. Ageing of paper.

How do you test tensile strength of paper at home?


  1. Tie a short length of your test material in a secure knot around the hook of the spring scale.
  2. Secure the top of the spring scale to something steady, like a table or wall.
  3. Pull on the test material until it breaks.
  4. Record the force measured by the spring scale right before the test material breaks.

What is the highest quality paper?

Rag paper
Rag paper contains 100% linen and/or cotton fibre and is therefore the highest quality and most expensive paper. Half-rag paper usually contains 50% rag fibre and 50% cellulose. There are also different grades of inexpensive paper made of 25% rag fibre and 75% cellulose.

How can you tell the quality of ink?

Generally one of the best ways to directly test the ink is to print a test page. Test page printing can be accessed from the “Control Panel” menu on the computer, where the “Printer and Fax” menu offers the option to print a test page.

What is the weakest type of paper?

tissue paper
We carried out an experiment to see how strong different types of paper are. We counted the number of marbles that each type of paper could support before ripping. Here we are measuring the strength of crepe paper. We predicted that tissue paper would be the weakest but crepe paper was the weakest.

Is 92 bright paper good?

Copy Paper Brightness Brightness varies from 90 to 100. The brighter the paper, the whiter it appears, making letters and images more crisp and vivid. A good brightness for standard everyday use is 92. Look for a higher number for important documents.

What is an opaque Tappi dirt estimation chart?

The opaque TAPPI Dirt Estimation Chart is a photographic print of the original chart developed for use with TAPPI T 213 “Dirt in Pulp” and T 437 “Dirt in Paper and Paperboard.” The basis for these two tests is to determine the numerical or visual estimation of dirt in paper, paperboard, or pulp in terms of equivalent black area (EBA).

How does the TAPPI calibrated size estimation chart work?

The TAPPI Calibrated Size Estimation Chart is a great solution for quality control applications where exact dimension specifications are required. Each Calibrated SEC comes with its own data sheet that provides an actual dot measurement area (expressed in squared mm) to correspond with the increments (dots) on the chart.

How are dirt specks counted in TAPPI T 437?

In this method, each dirt speck is counted individually regardless of size, shape, or color. Reflected light is also the basis for this method, so the TAPPI Dirt Estimation Chart is used, although the information on the chart relates to its use in T 437 and should be ignored when used with T 537.

Which is the best tool for the TAPPI inspection?

Instructions for use of this transparency are outlined in TAPPI Test Method T 564. Currently unavailable. The Dirt Estimation Chart is the right tool to estimate the equivalent black area (EBA) of dirt or other colored specks.