Can collar interlining be machine washed?

Whether collar interlining can be machine washed depends mainly on the material of the collar lining and the washing label of the shirt.
Generally speaking, if the collar interlining is made of a tough and non deformable material, such as resin linen, and the washing label of the shirt indicates that it can be machine washed, then the collar interlining can withstand machine washing to a certain extent. However, during machine washing, it is still important to use a laundry bag to protect the shirt and avoid excessive friction and pulling between the collar interlining and other clothing, in order to maintain its flatness and prevent deformation.
On the other hand, if the collar interlining is made of a relatively soft or deformable material, or if the shirt's washing label clearly states that it cannot be machine washed, it is recommended to clean the shirt by hand washing or dry cleaning to avoid deformation or damage to the collar interlining.
When cleaning the collar interlining, it is also important to use mild detergent and appropriate water temperature, and avoid using bleach or strong detergent to prevent damage to the collar interlining. In addition, when drying shirts, direct sunlight or high-temperature drying should be avoided to prevent shrinkage or deformation of the collar interlining.