Water ripples and bubbles are the surface of the material watermark and bubble point, so that the plastic products will directly affect the appearance of packaging items, reducing the appearance of the packaging image. The cause of water ripples is the relationship between the sheets. In the process of production, water ripples are related to the speed at which the film is produced. The reason for the bubble is that the temperature of the sheet is too high or the mixed production of the sheet causes the sheet to be infiltrated into the air. The presence of the bubble material causes the perforated and deformed plastic products to become defective Method is to purchase the material back or before production must be observed before the quality of the sheet before storage or production.