• Introduction
  • Abstract
  • Background
  • Working principle
  • Requirement
• Design Stage
  • Design
    • Conceptual design 1
    • Conceptual design 2
    • Conceptual design 3
    • Final Design
  • Parts Descriptions and Material Selection
  • Bill of matermal
  • Costing
• Manufacturing Stage
  • Work Schedule
  • Manufacturing Process
  • Assembly
  • Difficulty Faced and Solution
  • Testing
• Conclusion

Background

Paper shredders are used to cut paper into very fine strips or tiny paper chips. Government organizations, businesses, and private individuals use shredders to destroy private, confidential, or sensitive documents. Privacy experts often recommend that individuals shred bills, credit card and bank account statements, and other documents that could be used by thieves to commit fraud or identity theft.

Shredders range in size and price from small and inexpensive units meant for a few pages, to large units used by commercial shredding services that costs hundreds of thousands of dollars and can shred millions of documents an hour. Some shredders used by a commercial shredding service are built into a shredding truck.
These machines are classified according to the size and shape of the shreds they produce.
Strip-cut shredders use rotating knives to cut narrow strips as long as the original sheet of paper. These strips can be reassembled by a determined investigator, so this type of shredder is the least secure. It also creates the highest volume of waste

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Cross-cut or confetti-cut shredders use two contra-rotating drums to cut rectangular, parallelogram, or diamond-shaped shreds.
Particle-cut shredders create tiny square or circular pieces.
Disintegrators and granulators repeatedly cut the paper at random until the particles are small enough to pass through a mesh.
Hammermills pound the paper through a screen.
Pierce and Tear Rotating blades pierce the paper and then tear it apart.
Grinders A rotating shaft with cutting blades grinds the paper until it is small enough to fall through a screen.
There are numerous standards for the security levels of paper shredders, including:
DIN 32757
Level 1 = 12 mm strips
Level 2 = 6 mm strips
Level 3 = 2 mm strips (Confidential)
Level 4 = 2 x 15 mm particles (Commercially Sensitive)
Level 5 = 0.8 x 12 mm particles (Top Secret or Classified)
Level 6 = 0.8 x 4 mm particles (Top Secret or Classified)
United States Department of Defense (DoD)
Top Secret = 0.8 x 11.1 mm (1/32" × 7/16")
United States NSA/CSS 02-01 = 1 × 4 mm
Nowadays, paper slicer has become more powerful. The new model can be able to shredding of CDs, DVDs, hard drives, credit cards, and uniforms, among other things.

Our target user is the people who work in office; also it can be used in home. So our product is aim to portable and light in weight. Therefore material choosing is important in our project.