Hackling

Part of Rope Making

Combing fibers to align and clean them before spinning into yarn for rope.

Why This Matters

Raw retted fiber is a tangled mess. Short fibers, woody fragments (shives), and natural gum bind the long, strong fibers into clumps that cannot be spun into uniform yarn. Hackling — the process of drawing fiber through progressively finer beds of metal or wooden pins — aligns the fibers parallel, removes debris, and separates short weak fibers from long strong ones. The result is a smooth, clean ribbon of fiber called “line” that spins into consistent, strong yarn.

Skipping hackling means your yarn will be lumpy, weak at random points, and full of inclusions that create stress concentrations in the finished rope. A rope made from unhackled fiber might have half the breaking strength of one made from properly hackled fiber of the same species. When your rope is the only thing between a load of timber and someone’s skull, that difference matters absolutely.

Hackling also sorts your fiber by quality. The long fibers that pass through the hackle become premium “line” for rope and strong twine. The short fibers left behind in the pins (called “tow”) are perfectly useful for stuffing, caulking, insulation, and coarse string. Nothing is wasted.

Building a Hackle

Basic Hackle Design

A hackle is simply a board with rows of sharp pins or nails set into it. You need at least two hackles of different fineness:

Hackle Type	Pin Spacing	Pin Diameter	Purpose
Coarse	15-20 mm	3-4 mm	Initial separation, removes large shives
Medium	8-12 mm	2-3 mm	Further alignment and cleaning
Fine	4-6 mm	1-2 mm	Final dressing, produces smooth line

Construction Steps

1. Select the base: A hardwood board approximately 15 cm wide, 30 cm long, and 3-4 cm thick. Oak, maple, or beech work well. The board must be heavy enough to stay put during vigorous combing.

2. Prepare pins: The best pins are forged nails or wire sections, sharpened to a tapered point. For a coarse hackle, use 8-10 cm nails. Points should be sharp enough to penetrate fiber bundles but not so sharp they cut individual fibers.

3. Drill holes: Mark a grid pattern on the board. Drill holes slightly smaller than your pin diameter so the pins fit tightly. Drill depth should be approximately half the board thickness.

4. Set pins: Drive pins into the holes so they protrude 5-7 cm above the board surface. All pins must be the same height. Apply a small amount of pine pitch or hide glue around each pin base to lock it in place.

5. Mount the hackle: Clamp or bolt the hackle to a sturdy table or bench at a comfortable working height. The hackle must not move during use — you will be pulling against it with significant force.

Bone or hardwood pins work in a pinch

If you lack metal for pins, fire-hardened hardwood dowels or split bone can serve for a coarse hackle. They dull faster but are functional. Reserve any available metal for your fine hackle where precision matters most.

Alternative: Comb Hackle

For small quantities or field processing, a hand-held comb hackle works:

• Set a single row of 10-15 pins into a wooden handle
• Clamp the fiber in your other hand
• Draw the comb through the fiber repeatedly
• Slower than a board hackle but requires less material to build

The Hackling Process

Preparation

Before hackling, fiber must be:

1. Retted: The pectin binding fibers to the woody core must be broken down
2. Broken: The woody core (boon/shives) must be cracked away from the fiber
3. Scutched: Loose shives must be beaten away, leaving rough fiber bundles

If your fiber still has significant woody material attached, more scutching is needed before hackling. Forcing unscutched fiber through a hackle damages the pins and wastes time.

Step-by-Step Hackling

1. Form a strick: Take a handful of scutched fiber (about 50-100 grams) and gather it into a loose bundle called a strick. Hold it firmly at the midpoint.

2. Start with the coarse hackle: Hold the strick tightly in one hand. Lay the tips of one end into the pins near the far edge of the hackle.

3. Draw through: Pull the strick toward you through the pins in one smooth, firm motion. Do not jab the fiber into the hackle — enter at a shallow angle and pull horizontally.

4. Repeat: Flip the strick and hackle the other end. Then spread the fiber slightly in your hand and hackle each end again. Four to six passes through the coarse hackle should remove most remaining shives and large tangles.

5. Collect tow: Short fibers and debris accumulate in the hackle pins. Pull this material out periodically and set it aside as tow. Do not discard it.

6. Move to medium hackle: Transfer the now-cleaner strick to the medium hackle. Repeat the drawing process, 4-6 passes per end. The fiber should begin to look like a smooth, shiny ribbon.

7. Finish on fine hackle: Final passes through the fine hackle produce line — beautifully aligned, long fibers free of debris. The strick should drape like hair and feel silky.

Common Mistakes

Mistake	Result	Fix
Pulling too fast	Fibers snap, yield drops	Slow, steady pulls
Entering hackle at steep angle	Fibers wrap around pins	Enter at shallow angle, pull horizontally
Using too much fiber per strick	Pins cannot separate fibers	Use smaller handfuls
Skipping the coarse hackle	Shives jam fine hackle, damage pins	Always start coarse
Holding fiber too loosely	Fiber pulls out of hand, tangles in pins	Grip firmly at midpoint
Hackling damp fiber	Fibers stick together, won’t separate	Ensure fiber is fully dry

Grading the Output

Hackling naturally sorts fiber into quality grades:

Line (Long Fiber)

• The fiber that passes completely through all hackle stages
• Typical fiber length: 30-60 cm for hemp, 20-40 cm for flax
• Smooth, parallel, free of inclusions
• Use for: Rope, strong twine, fine cordage, sewing thread
• Represents approximately 50-65% of input fiber by weight

First Tow

• Fiber removed from the coarse hackle
• Mixed lengths, some shives still present
• Use for: Coarse string, caulking seams, stuffing mattresses, packing material
• Represents approximately 15-25% of input fiber by weight

Second Tow

• Fiber removed from the medium and fine hackles
• Shorter but cleaner than first tow
• Use for: Lamp wicks, tinder, medical dressings (absorbent), fine stuffing
• Represents approximately 10-15% of input fiber by weight

Waste

• Shives, dirt, very short fiber fragments
• Use for: Composting, fire starter, mixing into clay plaster for reinforcement
• Represents approximately 5-10% of input fiber by weight

Track your yield ratios

When processing a new fiber source, weigh your input and each output grade. This tells you the true cost of your line fiber and helps plan production quantities. If you need 10 kg of hackled line for rope, and your yield ratio is 55%, you need to process roughly 18 kg of scutched fiber.

Hackling Different Fibers

Hemp

Hemp is the most forgiving fiber to hackle. The long bast fibers (1-2 meters in the raw stalk) survive aggressive hackling well. Use firm, confident strokes. Hemp fiber is naturally coarse, so even well-hackled hemp line feels rough compared to flax. This coarseness is actually beneficial for rope — it creates more friction between fibers when twisted, increasing rope strength.

Flax

Flax requires gentler handling than hemp. The fibers are finer and more brittle when dry. Work with slightly smaller stricks and slower, more controlled passes. Flax should be hackled at moderate humidity — bone-dry flax fiber snaps easily. Some traditional processors lightly mist flax before hackling.

Nettle

Nettle fiber hackles similarly to flax but tends to produce more tow due to shorter average fiber length. The fibers are very fine and strong for their diameter. Expect lower line yield (40-50%) but excellent quality fiber.

Jute

Jute is soft and weak compared to hemp and flax. Hackle gently with wider-spaced pins. Aggressive hackling breaks too many fibers. Accept a rougher finish — over-processing jute destroys more fiber than it improves.

Maintaining Your Hackles

Daily Maintenance

• Clear tow from pins after each session
• Check for bent pins and straighten them
• Wipe pins with an oily rag (tallow, linseed oil) to prevent rust and reduce friction

Periodic Maintenance

• Re-sharpen pin tips every few months of regular use (a fine file works)
• Replace any broken or loose pins immediately — a gap in the pin field lets fiber pass uncleaned
• Check the board for cracks, especially around pin holes
• Re-oil the board annually to prevent drying and splitting

Pin Sharpening

Hold a fine file at approximately 30 degrees to the pin and draw it downward with light pressure. Rotate the pin 90 degrees and repeat. The goal is a gentle taper, not a needle point. Overly sharp pins cut fiber; you want pins that separate without severing.

Scaling Up Production

For a settlement producing rope regularly, hackling becomes a significant labor bottleneck. A skilled hackler processes approximately 2-3 kg of scutched fiber per hour through all three hackle stages, yielding 1-1.5 kg of line.

Efficiency Improvements

1. Dedicated hackle bench: Build a waist-high bench with multiple hackle stations (coarse, medium, fine) mounted in sequence. The hackler moves the strick down the line without changing position.

2. Batch processing: Process all fiber through the coarse hackle first, then all through medium, then all through fine. This minimizes transitions and builds rhythm.

3. Specialization: If multiple people are available, assign one person per hackle stage. The coarse hackle requires the most strength; the fine hackle requires the most patience and care.

4. Drum hackle: For large-scale production, build a rotating drum with pins set into its surface. Feeding fiber against the rotating drum hackles continuously, dramatically increasing throughput. This requires a crank mechanism or water/animal power.

Hackling is repetitive but meditative work. It is an excellent task for people who cannot perform heavy physical labor — it requires precision and patience more than strength. In historical fiber-processing communities, hackling was often performed by older workers or those recovering from injury.