School

Ryerson UniversityDepartment

Graphic CommunicationsCourse Code

GRA 324Professor

Derek EtsyLecture

3This

**preview**shows page 1. to view the full**5 pages of the document.**Test #7 Basis Weight

Scope and Summary

The purpose of this instrumentation test is to calculate the nominal basis weight and compare it to the

actual basis weight, as well as the nominal grammage and the actual grammage. The conditions for this

experiment were that each of the five different paper samples-two coated, two uncoated, and one newsprint

were to be stacked in sets of ten, cut into 5”x5” squares and weighed using the scale.

This test is important, as the weight of the paper must be known in order to properly set up a press for a job

during the makeready stage of production. It is also important information for ordering paper, as the paper

must be suitable for a specific job.

Instrument Description

Scout Pro Scale-M/N:SP202 S/N: 7129201984

Westcott Titanium Paper Cutter

Specimen Description

Williamsburg Offset 23x29 84M

Gusto Gloss Offset 20x29 73M

Kromekote Offset 23x35 102M

Earnscliffe Linen Bond 11x17 24M

Newsprint 28x40 78M

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Procedure

1. Select 2 uncoated, 2 coated, and 1-newsprint paper samples.

2. Cut paper using the paper cutter into 5”x5” squares, you will need 10 Squares for this test.

3. Individually weigh each of the samples on a scale, record your results.

4. Average the results as well as find the range.

5. Using information provided and your results calculate the nominal basis weight and the actual basis weight

6. Using the given formula find the nominal grammage and the actual grammage.

7. Compare the results and calculate the percentage that the paper is under or over weight.

Test #7 – Basis Weight Page 9

Results

Paper:

Williamsburg

Offset

Kromekote

Offset Gusto Gloss Earnscliff Newsprint

11.11g 1.44g 1.42g 1.38g 0.69g

21.11g 1.43g 1.44g 1.35g 0.73g

31.13g 1.38g 1.40g 1.33g 0.69g

41.15g 1.37g 1.37g 1.34g 0.73g

51.15g 1.35g 1.38g 1.33g 0.76g

61.11g 1.42g 1.34g 1.33g 0.78g

71.15g 1.37g 1.48g 1.32g 0.72g

81.12g 1.45g 1.39g 1.34g 0.82g

91.10g 1.47g 1.45g 1.35g 0.78g

10 1.16g 1.45g 1.42g 1.35g 0.71g

Average 1.13g 1.41g 1.41g 1.34g 0.74g

Range 0.05 0.12 0.13 0.06 0.13

Nominal Basis

Wt. 59.8 lbs 60.2 lbs 59.8 lbs 24 lbs 30 lbs

Actual Basis

Wt. 44.8 lbs 59.1 lbs 59.1 lbs 22.1 lbs 28.2 lbs

Nominal

Grammage 88.6 g/m2 89.2 g/m2 88.6 g/m2 90.3 g/m2 48.9g/m2

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