Tracing paper
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Tracing paper is a type of translucent paper. It is made by immersing unsized and unloaded paper of good quality in sulfuric acid for a few seconds. The acid converts some of the cellulose into amyloid form having a gelatinous and impermeable character. When the treated paper is thoroughly washed and dried, the resultant product is much stronger than the original paper. Tracing paper is resistant to oil grease and to a large extent impervious to water and gas.
Tracing paper is named as such for its ability for an artist to trace an image onto it. When tracing paper is placed onto a picture, the picture is easily viewable through the tracing paper. Thus, it becomes easy for the artist to find edges in the picture and trace the image onto the tracing paper.[1] Cellulose fiber in pure form is already translucent. The air entrapped between fibers make paper opaque and looks white. If the fibers are enough refined/beaten that all air is taken out, the resulting sheet will be translucent. Translucent papers are dense and contain up to 10% moisture at 50% humidity.
The sizing in production will determine whether it is for laser printer or inkjet/offset printing.
Tracing paper contents both uncoated and coated tracing paper. Natural tracing paper for laser priting is usually uncoated.
HS code for tracing paper is normanly 4806 [2]
Contents |
[edit] Technical specifications
- Specification of natural tracing paper:
- Surface: smooth
- Uncoated
- Non ageing
- Acid free
- Recyclable
The follows are commons standards for tracing paper:
| Substance | Density | Humidity | Roughness | Translucent | Tensile strength (MD) | Surface Alkali pH |
|---|---|---|---|---|---|---|
| ISO 536 (g/m²) | (kg/m³) | ISO 287 (%) | ISO 8791-2 (ml/min) | ISO 2469 (%) | ISO 1974 (mN) | ISO 6588 (pH) |
| 42 | 1,200÷1,235 | 7 | 100-300 | 79+/-5 | 220-440 | 6-7 |
| 53 | 1,200÷1,235 | 7 | 100-300 | 77+/-5 | 220-440 | 6-7 |
| 63 | 1,220÷1,250 | 7 | 100-300 | 75+/-5 | 220-440 | 6-7 |
| 73 | 1,220÷1,250 | 7.5 | 100-300 | 75+/-5 | 220-440 | 6-7 |
| 83 | 1,220÷1,250 | 7.5 | 100-300 | 75+/-5 | 220-440 | 6-7 |
| 93 | 1,220÷1,250 | 7.5 | 100-300 | 75+/-5 | 220-440 | 6-7 |
| 100 | 1,220÷1,250 | 7.5 | 100-300 | 75+/-5 | 220-440 | 6-7 |
| 112 | 1,220÷1,250 | 8 | 100-300 | 73+/-5 | 220-440 | 6-7 |
| 130 | 1,220÷1,250 | 8 | 100-300 | 69+/-5 | 220-440 | 6-7 |
| 150 | 1,220÷1,250 | 8 | 100-300 | 65+/-5 | 220-440 | 6-7 |
| 160 | 1,220÷1,250 | 8 | 100-300 | 61+/-5 | 220-440 | 6-7 |
| 170 | 1,220÷1,250 | 8 | 100-300 | 59+/-5 | 220-440 | 6-7 |
| 190 | 1,220÷1,250 | 8 | 100-300 | 55+/-5 | 220-440 | 6-7 |
| 200 | 1,220÷1,250 | 8 | 100-300 | 53+/-5 | 220-440 | 6-7 |
| 240 | 1,220÷1,250 | 8 | 100-300 | 47+/-5 | 220-440 | 6-7 |
| 280 | 1,220÷1,250 | 8 | 100-300 | 45+/-5 | 220-440 | 6-7 |
[edit] Application
- Traditional printing methods: letterpress, planographic / offset, silk-screen printing...
- Laser and inkjet printing
- Processing: varnishing, laminating, punching, embossing, folding, scoring
- Drawing: ink, Indian ink, graphite, pencils
[edit] Printing notices
- Offset printing:
- Print multicolored files on a multicolored machine – this helps to avoid registration problems.
- Packaging has to be removed immediately before printing.
- Paper stacks should be fanned out.
- Printing sheets should preferably be finished long grain.
- Translucent paper is printable with all popular as well as very fine screen widths.
- The use of frequency adjusted screen processes is also possible (FM-screening).
- The fountain solution pH has to be controlled (pH- >5,5).
- Only oxidative drying or UV-drying inks should be used.
- Addition of drying material should be avoided.
- Do not dry with hot air or infrared-heater, flatness problems may occur.
- Use powder spraying sparingly.
- Do not allow the stack after printing to be too high, thus allowing air to circulate to aid drying.
- Transparent papers require longer drying times, this has to be considered.
- Further processing can be done once the printing colors are completely dry.
- Inkjet printing:
- Line and script printing shows good results.
- Ink absorption is limited due to the high density of the transparent papers.
- Longer drying times have to be considered.
- Recommend a test-print.
- Laser printing:
- Transparent paper offers a fine closed surface that provides a high image quality.
- Due to high processing temperatures the paper may show some shrinkage or stretching effects.
- Therefore it is essential to test the run ability of the paper with the precise printing conditions.
- Recommendation:
- Transparent papers require a very high degree of mechanical treatment of the fiber.
- Thus it is sensitive to temperature and moisture fluctuations.
- The transparent paper should be stored in its original packing for 24 hours in the printing room.
- Ideal climate conditions for the transparent paper are 18 - 23° C at 45 – 55 %RH air humidity.
- Printed and unprinted transparent paper should be protected from moisture during storage.
[edit] Applications
- Envelopes
- Mailings
- Marketing inlays
- Flyer, coversheets, dividers, prestige printings, business cards, greeting cards, invitations, playcards and posters, origami
[edit] See also
[edit] References
[edit] Links
[edit] List of tracing paper mill
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