Blockboard Sheets and Their Uses

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Questions and Answers

What are the dimensions of the internal filler used in Blockboard panels?

  • 5 x 5 mm or 30 x 30 mm
  • 10 x 10 mm or 25 x 25 mm
  • 15 x 20 mm or 20 x 30 mm (correct)
  • 15 x 15 mm or 20 x 20 mm (correct)

Which of the following is NOT a use of Blockboard panels?

  • Cladding of walls
  • Making tables and benches
  • Production of electronic circuit boards (correct)
  • Manufacture of furniture

What is one disadvantage of Blockboard panels related to their construction?

  • They cannot be easily painted
  • They cannot support heavy loads
  • They have a short lifespan compared to solid wood
  • They are prone to curvature due to the direction of the annual rings (correct)

What is the thickness range available for Blockboard panels?

<p>12, 19, 22, 25 mm (C)</p> Signup and view all the answers

Which statement about the advantages of Blockboard panels is accurate?

<p>They allow for different wood joints and interlocks. (D)</p> Signup and view all the answers

What is the primary advantage of using particleboard in furniture manufacturing?

<p>It is economical and easy to operate with machines. (A)</p> Signup and view all the answers

Which of the following is a limitation of particleboard when used in construction?

<p>It is susceptible to damage if crushed at angles. (D)</p> Signup and view all the answers

What is the typical density range of particleboard used in the furniture industry?

<p>550 - 750 kg / m 3 (D)</p> Signup and view all the answers

Which adhesive is commonly used in the production of particleboard?

<p>Urea Formaldehyde (B)</p> Signup and view all the answers

Which of the following applications is NOT suitable for particleboard?

<p>Making high-strength structural beams (D)</p> Signup and view all the answers

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Study Notes

Blockboard Sheets

  • Composed of layers of veneer on top and bottom with wooden lists in between.
  • Width of wooden lists spans from 7 mm to 30 mm.
  • Typically used in furniture manufacturing and interior design.
  • Internal filler consists of softwood (e.g., poplar or white pine) measuring 15x15 mm or 20x20 mm, or rectangles of 15x20 mm or 20x30 mm, with a maximum length of one meter.
  • Veneer layers are made from various woods, 2-3 mm thick, placed on fibrous reflective middle blocks.

Uses of Blockboard Panels

  • Suitable for furniture manufacturing.
  • Used for wall cladding and making tables and benches.
  • Ideal for creating long bookshelves and internal door fillers.

Advantages of Blockboard Panels

  • Easy application of natural wood veneers or Formica, available in ready-to-use pallets.
  • Capable of forming interlocks and various welds for large surface construction.
  • Produces large areas without visible joints or defects.

Disadvantages of Blockboard Panels

  • Filler packs cannot reverse the annual ring direction, leading to potential curvature.
  • Requires edge treatment with wood frames.
  • May curve after applying veneer on one side.
  • Expansion gaps become noticeable when trimming the board.

Sizes and Sales Units of Blockboard Panels

  • Thickness options: 12, 19, 22, and 25 mm (locally manufactured).
  • Available sizes:
    • 244 x 122 cm
    • 220 x 122 cm
    • 200 x 125 cm
    • 120 x 100 cm

Manufactured Wood Types

Particle Boards

  • Made from cellulose fibers from varied sources (wood, flax, cotton, sugarcane).
  • Processed mechanically into particles, dried, mixed with adhesives, and compressed at high temperatures (around 120°C).
  • Commonly used in furniture industry, density ranges from 550 to 750 kg/m³.
Properties of Particleboard
  • Manufactured as large panel sizes with a homogeneous structure.
  • Acts as a sound isolator and is easy to operate with machines or manually.
  • Compatible with wood veneer, Formica, and plastic.
  • Economical and cost-effective.
Disadvantages of Particleboard
  • Prone to crushing at edges; requiring additional framing for protection.
  • Less durable than natural wood or blockboard.
  • Ineffective for making holes for screws or hinges.

Uses of Particleboard

  • Ideal for wall and ceiling cladding in various settings (homes, offices, halls).
  • Provides sound insulation for theatres, cinemas, and lecture halls.
  • Used in the manufacture of furniture, including desks and cabinetry.
  • Suitable for door cladding and filling.

Available Sizes of Particleboard

  • Size options include:
    • 244 x 122 cm
    • 366 x 122 cm
  • Thickness options: 6, 8, 10, 12, 16, 19, 22, 25, 30, and 36 mm.

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