Security papers

Question 1

Name 5 types of security papers and 5 different security methods, which can be integrated into paper properties!

Answer 1

• Banknotes
• Cheques
• Passports
• Certificates
• Admission tickets
  1) Water marks
  2) Security thread
  3) Special foil
  4) UV letters
  5) Iridescent stripe

Question 2

Which raw materials are used for the production of banknote paper and why?

Answer 2

Cotton fibres (waste from other processes) – these are extremely long fibres so this really helps with tear strength and fold endurance.
Synthetic fibres – often UV florescent or metallic fibres.

Question 3

What is a security thread?

Answer 3

An elastic thread that runs throughout the paper. It can either be put between 2 sheets or when touching the mould it can weave in and out of the paper.

Question 4

What type of security fibers do you know (name 3 different types) and how do they work?

Answer 4

UV fibres
Coloured fibres
metallic fibres

Question 5

What types of watermarks do you know and how can they be added to paper?

Answer 5

• Cylinder mould watermarks – the fibres are deposited in different quantities during sheet building which variers the thickness of the paper. The image can then be seen when held against light
• Dandy roll marks – formed by compressing the fibres using the dandy roll while the paper is wet
• Marks can also be produced using lasers.
• Molette mark – after the wire section the sheet is compressed between a rubber role with the image and a steel roll to compress.