Purlbed

Pleats and folds › Origami structures

Water-bomb X Tessellation

X-pleat columns repeated across the width, separated by stationary vertical valley folds on the back bed. All the moving diagonals and the horizontals are on the front bed; the back-bed folds never move.

Machine types that can knit it

Demo swatch

Drawn for: Double-bed hand flat (V-bed)
Approximate preview worked out from the bed chart, not a photo.
Bed chart
15101520253035→←→←→←→←→←→←→←→←→←→←→←→←→←→←→←→←→←→←Front bedBack bedBoth beds (double jersey)1 square = 1 stitch × 1 row · read from the bottom · Hand flat (V-bed), 36 needles, half pitch
Needle notation, first steps
1. Row 1: knit 1 rowBed-selected motif (back 12 /both 24)carriage →backfront2. Transfer 6 stitches to theback bedbackfront3. Row 2: knit 1 rowBed-selected motif (back 18 /both 18)← carriagebackfront4. Transfer 6 stitches to theback bedbackfrontShowing needles L18–R6 of 36; repeat across the working area.

The full card

How it behaves
Contracts in both directions into a dense bubbly tessellation and stays flexible.
How it works
X-pleat columns repeated across the width, separated by stationary vertical valley folds on the back bed. All the moving diagonals and the horizontals are on the front bed; the back-bed folds never move.
Machines
Needs a double bed and many transfers. Feasible on a domestic machine with ribber if the column widths are halved.
Parameters
Column width Wc, separator F (back bed), rate, Hc, number of columns. 1. Lay out the stationary back-bed vertical folds between columns. 2. Work the X-pleat strip template in each column at the same time. 3. Work the horizontals across the full width.
Charting
Blue fixed columns plus red X shapes and red horizontal bands. Keep the chart on squared paper, use the row counter, and tick off each section.
Limits and common problems
Easy to lose your place. Mixing up the beds turns pyramids into recesses.
Combines with
x-pleat-pyramid-strip, star-waterbomb-tessellation.
Pieces and assembly
A flat panel. Use it as a 3D surface panel, sleeve, or cushion face.

Written in our own words from machine manuals, knitting references and swatching. Knit a test swatch before a whole piece.

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