Why is it that when you use a new cloth to patch an old cloth,the patch shrinks and tears part of the old cloth making an even bigger patch
When a new cloth is used to patch an old cloth, several factors can contribute to the shrinking and tearing of the patch, which can result in a larger patch than anticipated. Here are a few possible reasons:
1. Different fabric properties: The new cloth and the old cloth might have different fabric compositions, weaves, or stretch properties. When washed, certain fabrics may shrink more than others or react differently to moisture and heat. As a result, the new cloth may shrink more than the old cloth when exposed to laundering or other environmental conditions, leading to tension and tearing in the surrounding fabric.
2. Uneven stress distribution: The sewing or attachment of the patch might not distribute stress or tension evenly across the fabric. The lack of uniformity in the attachment process can create weak spots in the fabric, causing tearing or fraying when exposed to strain or stress.
3. Incompatible sewing techniques: Different fabrics may require specific sewing techniques to ensure a secure and durable patch. If an unsuitable or incorrect sewing technique is used to attach the new cloth to the old one, it can weaken the overall structure and eventually lead to tearing or unraveling of the fabric.
4. Differing levels of wear and tear: The old cloth may already be weakened, thin, or worn out compared to the new cloth. When a patch is applied, the stress on the older fabric can exceed its capacity, causing it to tear and potentially increasing the overall size of the patch.
In summary, the combination of different fabric properties, uneven stress distribution, incompatible sewing techniques, and pre-existing wear and tear in the old cloth can result in the patch shrinking and tearing part of the fabric, leading to a potentially larger patch.