Knitting generally does not shrink when blocked; in fact, blocking typically has the opposite effect. When you block a knitted piece, you usually stretch and shape it to achieve the desired dimensions and even out the stitches. However, the outcome depends on the fiber content, the knitting technique, and the method of blocking used. Here’s a closer look:
1. What is Blocking?
Blocking is a finishing technique used to shape and set the dimensions of knitted or crocheted fabric. It involves wetting, steaming, or spraying the fabric with water, and then allowing it to dry in a particular shape. This process can help:
- Even out stitches for a more uniform appearance.
- Set the size of the finished piece according to pattern specifications.
- Shape the fabric, especially in lace knitting, where blocking opens up the lace patterns.
2. Effects of Blocking on Different Fibers
- Wool: Wool tends to relax and stretch when blocked. Blocking helps woolen pieces achieve their intended size and shape, often making them larger or more evenly shaped. Wool can return to its original shape when washed, but it typically does not shrink during blocking.
- Cotton: Cotton may stretch slightly when blocked, particularly if you pull the fabric while it’s wet. Cotton is less elastic than wool, so it holds its shape well after blocking but does not shrink.
- Acrylic: Acrylic yarn often does not change significantly in size when blocked because it is a synthetic fiber. However, steam blocking can help set the shape, but the fabric is unlikely to shrink.
- Silk and Linen: These fibers can stretch when blocked, especially when wet, but like wool and cotton, they do not typically shrink.
3. Methods of Blocking
- Wet Blocking: Soaking the item in water, then laying it out flat to dry, often results in the fabric relaxing and stretching to the desired dimensions.
- Steam Blocking: Using steam to gently set the stitches, particularly useful for synthetic fibers like acrylic. It usually helps to shape the fabric but does not cause shrinkage.
- Spray Blocking: Lightly misting the fabric with water and then shaping it. This is a gentler method that is less likely to cause significant changes in size but still helps to set the fabric.
4. Does Blocking Ever Cause Shrinking?
- Over-Stretching: While blocking is intended to stretch and shape, if you pull the fabric too aggressively, you might inadvertently distort it. However, it’s more common for the fabric to become larger or more relaxed rather than shrinking.
- Temperature Sensitivity: Certain fibers, particularly synthetic ones like acrylic, can melt or deform if exposed to too much heat during steam blocking. This can lead to unexpected changes in size or texture, but this is not true shrinking.
Conclusion
Blocking is a crucial step in finishing your knitted items, but it generally does not cause shrinking. Instead, blocking usually helps to stretch and shape the fabric, ensuring that it reaches its intended size and appearance. As long as you block your items carefully, paying attention to the fiber content and method used, you should achieve a beautiful, well-shaped finished piece without any worry of shrinking.