After profile stretching, the size is not in place, which is a common problem. This may be caused by the elastic recovery of the material, deformation during the processing, or unreasonable mold design. To correct this problem, we can take the following several methods:

1. Heating correction: By heating the material, it can become more flexible and easy to deform. During the heating process, we can apply appropriate external force to the material to achieve the purpose of correcting the size. Heating correction is usually applicable to metal materials and alloy materials.

2. Cooling correction: Opposite to heating correction, cooling correction cools the material to make it more brittle and hard. During the cooling process, we can apply appropriate external force to the material to achieve the purpose of correcting the size. Cooling correction is usually applicable to plastics and rubbers.

3. Mechanical correction: Mechanical correction is a method of correcting materials using mechanical equipment. By applying appropriate external force to the material, it can be restored to the required size. Mechanical correction is usually applicable to metal materials and alloy materials.

4. Mold correction: Mold correction is a method of correcting materials using molds. By adjusting and optimizing the mold, the material can be made to conform more closely to the required size during processing. Mold correction is usually applicable to mass-produced parts.

5. Chemical treatment: Chemical treatment is a method of treating materials with chemical reagents. By acid washing, alkali washing, electrochemical treatment, etc., the residual stress on the surface of the material can be eliminated, thereby achieving the purpose of correcting the size. Chemical treatment is usually applicable to metal materials and alloy materials.

In summary, after profile stretching, the size is not in place, which is a common problem. To correct this problem, we can choose the appropriate correction method according to the specific material and processing requirements. By taking appropriate measures, the size can be effectively corrected, thereby improving the performance and service life of the material.