Fabric shrinkage from a swatch wash test, and how much fabric to buy before washing.
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Calculates fabric shrinkage (or growth) from a swatch measured before and after washing and drying: length change along the selvedge, width change across the fabric, and the change in area. Use the same marked distances before and after, in one unit (cm or inches). Positive percentages are shrinkage, negative are growth.
The same marked width after washing and drying.
The same marked length after washing and drying.
Marked width before washing (across the fabric), greater than 0.
Marked length before washing (along the selvedge), greater than 0.
Unit of the four measurements (only used to label the answer). Default cm.
Calculates fabric shrinkage (or growth) from a swatch measured before and after washing and drying: length change along the selvedge, width change across the fabric, and the change in area. Use the same marked distances before and after, in one unit (cm or inches). Positive percentages are shrinkage, negative are growth.
| Argument | Type | Description |
|---|---|---|
| unit | string | Unit of the four measurements (only used to label the answer). Default cm. |
| width_after* | number | The same marked width after washing and drying. |
| length_after* | number | The same marked length after washing and drying. |
| width_before* | number | Marked width before washing (across the fabric), greater than 0. |
| length_before* | number | Marked length before washing (along the selvedge), greater than 0. |
{
"type": "object",
"required": [
"length_before",
"length_after",
"width_before",
"width_after"
],
"properties": {
"unit": {
"enum": [
"cm",
"in"
],
"type": "string",
"description": "Unit of the four measurements (only used to label the answer). Default cm."
},
"width_after": {
"type": "number",
"description": "The same marked width after washing and drying.",
"exclusiveMinimum": 0
},
"length_after": {
"type": "number",
"description": "The same marked length after washing and drying.",
"exclusiveMinimum": 0
},
"width_before": {
"type": "number",
"description": "Marked width before washing (across the fabric), greater than 0.",
"exclusiveMinimum": 0
},
"length_before": {
"type": "number",
"description": "Marked length before washing (along the selvedge), greater than 0.",
"exclusiveMinimum": 0
}
},
"additionalProperties": false
}Works out how much fabric to buy before washing so that the usable length needed remains afterwards: required length = (usable length + extra) ÷ (1 − lengthwise shrinkage), then rounded up to the shop’s selling increment. Works in metres or yards (any one unit). A negative shrinkage rate means growth.
| Argument | Type | Description |
|---|---|---|
| unit | string | Unit of the lengths (only used to label the answer). Default m. |
| extra_length | number | Optional extra usable length after washing (default 0). Do not count an allowance the pattern already includes. |
| usable_length* | number | Length needed after washing (check the pattern layout), greater than 0. |
| shop_increment | number | The shop’s selling increment to round up to, e.g. 0.25 for quarter metres or 0.125 for eighth yards. 0 for no rounding (default 0). |
| shrinkage_percent* | number | Measured lengthwise shrinkage in percent, e.g. 5 for 5%. Negative means growth. |
{
"type": "object",
"required": [
"usable_length",
"shrinkage_percent"
],
"properties": {
"unit": {
"enum": [
"m",
"yd"
],
"type": "string",
"description": "Unit of the lengths (only used to label the answer). Default m."
},
"extra_length": {
"type": "number",
"minimum": 0,
"description": "Optional extra usable length after washing (default 0). Do not count an allowance the pattern already includes."
},
"usable_length": {
"type": "number",
"description": "Length needed after washing (check the pattern layout), greater than 0.",
"exclusiveMinimum": 0
},
"shop_increment": {
"type": "number",
"minimum": 0,
"description": "The shop’s selling increment to round up to, e.g. 0.25 for quarter metres or 0.125 for eighth yards. 0 for no rounding (default 0)."
},
"shrinkage_percent": {
"type": "number",
"minimum": -100,
"description": "Measured lengthwise shrinkage in percent, e.g. 5 for 5%. Negative means growth.",
"exclusiveMaximum": 100
}
},
"additionalProperties": false
}