Paper Definitions:

Basis Weight
The basis weight of a paper is the designated fixed weight of 500 sheets, measured in pounds, in that paper's basic sheet size. It is important to note that the "basic sheet size" is not the same for all types of paper.

Caliper
Caliper refers to the thickness of a sheet of paper expressed in thousandths of an inch. This measurement is taken with a micrometer.

Normally, paper caliper should not have more than a + or - 5% variance within a sheet. Generally, the relationship between caliper and basis weight .... the greater the caliper (the thicker the paper), the greater the paper weight.

Equivalent Weight
While different paper types have different basic sizes, papers can still be compared by using equivalent weight.

Type Paper Basic Size - 500 Sheets
"Bond"
Ledger
Mimeo
Duplicator
Rag Paper
17" x 22"
"Offset"
Book
Text
Coated Paper
25" x 38"
"Cover" 20" x 26"
"Tag Stock" 24" x 36"
"Index" 25-1/2" x 30-1/2"

The Values in the table below are intended to serve as a guide only. They should not be used as specifications because there are variances within the same basis weight due to other characteristics of the papers. Similar weight papers may vary between different paper manufacturers.

  Bond Ledger Offset Text Cover Tag Index Points *Caliper (inches) millimeters Metric (grams/sq meter)
Equivalent
Weight
16 40 22 37 33 3.2 .0032 0.081 60.2 gsm
18 45 24 41 37 3.6 .0036 0.092 67.72 gsm
20 50 28 46 42 3.8 .0038 0.097 75.2 gsm
24 60 33 56 50 4.8 .0048 0.12 90.3 gsm
28 70 39 64 58 5.8 .0058 0.147 105.35 gsm
29 73 40 62 60 6 .0060 0.152 109.11 gsm
31 81 45 73 66 6.1 .0061 0.155 116.63 gsm
35 90 48 80 74 6.2 .0062 0.157 131.68 gsm
36 90 50 82 75 6.8 .0068 0.173 135.45 gsm
39 100 54 90 81 7.2 .0072 0.183 146.73 gsm
40 100 56 93 83 7.3 .0073 0.185 150.5 gsm
43 110 60 100 90 7.4 .0074 0.188 161.78 gsm
44 110 61 102 92 7.6 .0076 0.193 165.55 gsm
47 120 65 108 97 8 .0078 0.198 176.83 gsm
53 135 74 122 110 9 .0085 0.216 199.41 gsm
54 137 75 125 113 9 .009 0.229 203.17 gsm
58 146 80 134 120 9.5 .0092 0.234 218.22 gsm
65 165 90 150 135 10 .0095 0.241 244.56 gsm
67 170 93 156 140 10.5 .010 0.25 252.08 gsm
72 183 100 166 150 11 .011 0.289 270.9 gsm
76 192 105 175 158 13 .013 0.33 285.95 gsm
82 208 114 189 170 14 .014 0.356 308.52 gsm
87 220 120 200 180 15 .015 0.38 312 gsm
105 267 146 244 220 18 .0175 0.445 385.06 gsm

· The darker colored boxes above represent the "most common paper weights" for that category.

· Normal paper manufacturing tolerance within a paper production run is + or - 5% to 7% caliper.

 
Frequently Asked Questions
Do you have standard dies?
Dies are not really considered standard because they have to be maintained and rebuilt depending upon the amount of use. Some common sizes, like a 4" pocket, are readily available and not that expensive to use.

What is the typical production time for a project?
This of course depends on the complexity of the project and the number of steps needed to complete. Typically, once the proof is approved to print projects that print and trim 3-4 business days. If it folds or folds and stitches add another 1-3 days. For projects that die cut, perfect bind, wire-o bind etc plan on 2 weeks from proof approval to completion. All that being said there are times when projects take longer than the 2 weeks and times when we can get projects done in a shorter than “normal” production time. If you have project that HAS to be done on a certain date, please contact us to see if we can accommodate your needs.

What is a good trim size to keep costs down?
Most everything in our industry revolves around the 8 1/2'’ X 11" format. If you get away from that size you should have your representative check the size you are considering and confirm that it fits an available press sheet and works in an efficient manner. Bleeds are also an important factor. We realize that sometimes design is more important, but it is good to know that in the beginning. Sometimes small changes in design can have a large impact on cost.

How do I set up the margins for drilling, page numbers and other spacing?
The edge of a 3-hole 5/16" drilling hole is close to 5/8" from the trim or center gutter of a brochure. Live copy you want to clear drilling, should be kept about 3/4" from that point. Other live copy, such as page numbers, should be kept a minimum of 1/4" from the trim. This is especially important with the thicker brochures, price lists and other more critical jobs to trim. We also will apply additional tiling to these types of projects, to compensate for the build up you may have with the larger saddle stitched type literature.

Why does there need to be trapping?
Trapping is the slight overlapping of items and colors within the project. It eliminates any leaks of white showing if you were to produce a job by just butting the colors to each other. Trapping is done by our imaging personnel who understand how to layer colors in the correct order to obtain the desired result.


Greenville Printing Company | 1120 S. Edgewood St. | Greenville, MI 48838 | PH 1-800-445-8890 | FX 1-616-754-6385

Copyright © 2008 All rights reserved.