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Lecture 3

GRA 324 Lecture Notes - Lecture 3: Cobray Company, International Paper, Outlast


Department
Graphic Communications
Course Code
GRA 324
Professor
Derek Etsy
Lecture
3

Page:
of 4
Test #3 Blanket, Plate and Paper Caliper Test
Scope and Summary
The scope of this test is measure the thickness of different forms of paper in order to determine a uniform thickness of the
paper. This identifies the bulky or dense the paper is and this thickness is measured by a micrometer. Testing caliper is
considered a necessity because it affects the flexibility of paper. If a paper is too thick or bulky, a printer could have difficulty
printing on that kind of paper. Limitiations on this test cold be human error such as moving the paper while measureing the
caliper, broken micrometer and a possible battery drainage witin the micrometer. The test determines the thickness of paper
and if the paper does not have a good uniform thickness, this could lead to problems within the printing process. Higher
caliper papers hold out better when a there is a heavy ink coverage and do not wrinkle easily. Lower caliper papers, also,
do not hold up well in printers as they may jam the printer if it does not have a straight paper path. By determining the
thickness of the paper then a person can know whether or not the paper would be right for the job being presented
Instrument Description
Micrometer. Serial Number: 004541 Model: PK-0505CPX
Specimen Description
Gusto Gloss Offset, 20x29, 73M, 60 lb, 88.9 g/m
Kromekote Offset, 23x35, 102M, 60lb, 88.9 g/m
Williamsburg Offset, 23x29, 84M, 60lb, 88.9 g/m
Newsprint, 28x40, 78M, 30lb, 48.9 g/m
Rolland Opaque Offset, 26x40, 219M, 100lb, 148.1 g/m
Procedure
1. Gather materials needed in order to perform the test, 4 sheets of each paper is needed, 1 plate and 1 blanket. As well as
a micrometer.
2. Record the names, basic weight, m-weight, grammage and size of the papers
3. Measure each set of 4 sheets of paper ten times each around the paper, blanket and plate
4. Record the readings and divide each reading by four to determine a single sheet measurement
5. Find the average of all ten readings
Test #3 – Blanket, Plate and Paper Caliper Test Page 1     
Results
Paper –
Single
Sheet
Caliper
(4
sheets/4
)
Plate Blanket
Reading
No.
Gusto Gloss
Paper    
Krome Coat
Offset     
Rolan Opaque
Offset
Williamsberg
Offset Newsprint            
10.0031   
   0.0041 0.0075 0.0040 0.0030 0.0125   
   0.0780
2 0.0030 0.0041   
  
0.0075   
  
0.0040   
  
0.0030   
  
0.0150   
  
0.0785    
30.0030   
  
0.0041   
  
0.0089   
  
0.0039   
  
0.0030   
  
0.0130   
  
0.0795    
40.0030   
  
0.0041   
  
0.0076   
  
0.0039   
  
0.0030   
  
0.0180   
  
0.0785    
50.0030   
  
0.0040   
  
0.0079   
  
0.0040   
  
0.0030   
  
0.0175   
  
0.0790    
60.0031   
  
0.0041   
  
0.0080   
  
0.0039   
  
0.0031   
  
0.0180   
  
0.0780    
70.0030   
  
0.0041   
  
0.0076   
  
0.0039   
  
0.0030   
  
0.0175   
  
0.0785    
80.0030   
  
0.0041   
  
0.0088   
  
0.0040   
  
0.0030   
  
0.0175   
  
0.0785    
90.0031   
  
0.0041   
  
0.0078   
  
0.0040   
  
0.0030   
  
0.0180   
  
0.0785    
10 0.0031   
  
0.0041   
  
0.0081   
  
0.0040   
  
0.0030   
  
0.0155   
  
0.0785    
Avg. 0.003    
0.0041   
  
0.0080   
  
0.0040   
  
0.0030   
  
0.0127   
  
0.0786    
*all measurements in inches
Discussion
Higher caliper papers tend to have a higher absorbency and are needed for some visual weight to a project. Lower caliper
paper can lead to a bleed-through and can also cause jams in the printer.
Our predictions were that the caliper of coated papers would be slightely higher than those of uncoated paper. Since
coated paper is finished then we had determined that it would be slightely larger. These predictions, however, were wrong.
Our results had stated that the only large difference wa between Rolan Opaque Offset paper and the rest of the papers
tested. Since Rolan Opaque Offset is considered an uncoated paper than our results determine that uncoated paper has a
higher caliper than coated.
Our results had shown that newsprint had the same caliper as Gusto Gloss Paper. This had gone against our initial
predictions because we had predicted that newsprint would have the lowest caliper. Before taking the measurements of the
plate and the blanket, the group had noticed a significant difference in the thickness between the plate and the blanket
compared to the papers gathered for the test. This had lead our group to predict that the caliper of both the plate and the
blanket would have a higher caliper than the rest. Just by the feeling of durability of the rubber blanket and also its flexibility,
our group had decided to predict the blanket would have a much higher caliper than the rest of the materials gathered. Our
results showed that our predictions were true and that the plate had a significantly higher caliper than the plate.
Our results may not be completely accurate as there is always a chance of human error. Moving the micrometer just slightly
while taking a measurement could lead to a misaccurate reading in the test. Our group had also noticed that the micrometer
reading would move slightly before measuring the paper and so therefore our results can not be viewed as one hundred
percent accurate.
Test #3 – Blanket, Plate and Paper Caliper Test Page 3