Question

In Needle punching a Crown needle has ......... number of barbs

• A. 2
• B. 3
• C. 4
• D. 7

Hint:

• Felting needles for needle punching have barbs to catch and reorient fibers.
• Needle blades are often triangular in cross-section.
• A Crown needle} has barbs arranged in a "crown" around the blade.
• For a standard triangular blade, this usually means 3 barbs per crown level}, one on each of the three edges.
• Needles can have multiple such crowns along their working part. The question seems to ask for barbs per single crown formation.

Answer 1

The Correct Option is B

Step 1: Understanding Needle Punching

Needle punching is a mechanical process used in nonwoven fabric production, where barbed needles repeatedly punch through a fiber web to entangle and bond the fibers.

Step 2: Role of Needles in Needle Punching

Needle Types: Different needles (e.g., Crown, Fork, Convoluted) have varying barb designs.

Barbs: Small hooks on the needle shaft that catch and interlock fibers.

Crown Needle: A common type used for general-purpose needling.

Step 3: Structure of a Crown Needle

A Crown needle typically has:

A Shaft – The main body of the needle.

A Point – The tip that penetrates the fiber web.

Barbs – Protrusions along the shaft that entangle fibers.

Step 4: Counting the Barbs

Standard Crown Needle: 3 barbs (most common configuration).

Some variations may have more, but industry standards typically specify 3 barbs for Crown needles.

Step 5: Verification

Manufacturer Specifications: Leading needle suppliers (e.g., Groz-Beckert, Foster) confirm Crown needles usually have 3 barbs.

Comparison with Other Needles:

Fork Needle: 2 barbs

Convoluted Needle: 4 or more barbs

A Crown needle has 3 barbs.

Final Answer: 3