The amount of shrinkage a 60% cotton and 40% polyester sweater will experience when washed and dried depends on several factors, including the specific brand, manufacturing process, and care instructions followed. Both cotton and polyester can shrink when exposed to heat, but polyester is generally more resistant to shrinking compared to cotton.
Cotton fibers have a natural tendency to shrink when subjected to high temperatures, such as in a washing machine and dryer, due to the release of tension in the fibers. On the other hand, polyester fibers are synthetic and less likely to shrink under the same conditions.
As a rough estimate, you can expect a 60% cotton and 40% polyester sweater to shrink around 3-5% in length and width after the first wash and dry. However, it's important to note that the actual amount of shrinkage can vary depending on the specific fabric blend, the quality of the sweater, the water temperature used during washing, the drying temperature, and the washing and drying methods employed.
To minimize shrinkage and keep your sweater in good condition:
Follow care instructions: Always check the care label on the sweater for specific washing and drying instructions. Different garments may have different recommendations.
Use cold water: Washing in cold water can help reduce the potential for shrinkage in the cotton fibers.
Air dry or use low heat: If possible, air dry the sweater or use a low-heat setting in the dryer. High heat can contribute to more significant shrinkage.
Avoid over-drying: Remove the sweater from the dryer promptly to prevent over-drying, as this can lead to increased shrinkage.
Block the sweater after washing: After washing, reshape the sweater while it's damp and lay it flat to dry to help maintain its original size and shape.
Remember that some shrinkage is normal, especially with natural fibers like cotton, and it's crucial to care for your sweater properly to minimize potential shrinkage and maintain its appearance and fit.