To remove sizing from fabric, wash it using a detergent like Synthrapol in the hottest water the fabric can tolerate, then tumble dry. This process pre-shrinks the fabric and removes sizing chemicals.
Here's a more detailed explanation:
Why Remove Sizing?
Sizing is a starch-based substance applied to fabric during manufacturing. It serves several purposes:
- Facilitates Weaving: Sizing strengthens the yarns, allowing them to withstand the high-speed stresses of weaving.
- Reduces Shrinkage: It can temporarily reduce shrinkage during the manufacturing process.
- Improves Texture: Sizing can give fabric a smoother, stiffer feel.
However, sizing can also interfere with dyeing, printing, and sewing. Removing it ensures better results with your fabric projects.
Methods for Removing Sizing
The most effective method is washing, but other techniques can also be used:
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Washing with Synthrapol:
- What it is: Synthrapol is a non-ionic detergent that effectively removes sizing, oils, waxes, and other chemicals from fabric. It is considered an industrial-strength cleaner but is safe for most fabrics.
- How to use it: Add Synthrapol to your washing machine according to the product's instructions. Wash the fabric in the hottest water the fiber content can tolerate.
- Why it works: Synthrapol breaks down the sizing and allows it to be rinsed away.
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Washing with Regular Detergent:
- What it is: A typical laundry detergent.
- How to use it: Wash the fabric in the washing machine as you normally would, using a detergent suitable for the fabric type. Hot water is generally more effective at removing sizing.
- Why it works: While not as effective as Synthrapol, regular detergents can still remove a significant amount of sizing.
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Soaking:
- What it is: Pre-soaking the fabric before washing can help loosen the sizing.
- How to use it: Soak the fabric in hot water with a small amount of detergent or Synthrapol for several hours or overnight. Then, wash as usual.
- Why it works: Soaking allows the water and detergent to penetrate the fabric more effectively, loosening the sizing.
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Drying:
- What it is: After washing, tumble dry the fabric.
- How to use it: Dry the fabric in the dryer on the appropriate heat setting for the fiber content.
- Why it works: The heat from the dryer helps to further shrink the fabric and remove any remaining sizing residue. Be sure to check the fabric after the dryer to ensure there are no issues.
Considerations for Different Fabrics
- Cotton: Can usually be washed in hot water and dried on high heat.
- Linen: Similar to cotton, linen can withstand hot water and high heat.
- Synthetics (Polyester, Acrylic, Nylon): Wash in warm or cool water and dry on low heat to prevent damage.
- Delicate Fabrics (Silk, Rayon, Wool): Wash by hand or on a delicate cycle in cool water with a gentle detergent. Air dry to prevent shrinkage and damage.
Additional Tips
- Test a Small Area: Before washing an entire piece of fabric, test a small, inconspicuous area to ensure the washing method doesn't damage or discolor the fabric.
- Multiple Washes: For heavily sized fabrics, you may need to wash them more than once.
- Ironing: Ironing can sometimes help to remove any remaining sizing residue.
By following these steps, you can effectively remove sizing from your fabric and ensure better results for your sewing and crafting projects.
