Abstract: Methods and equipment to reduce or eliminate metal edge-pick-off defects in freshly metallized polymeric film rolls are disclosed. The method may include the formation of a “raised edge” such that the ingress of air and/or oxygen gas into the ends of the wound freshly-metallized roll is blocked or impeded, thus reducing oxidation of the metal. This method significantly reduces the amount of metal pick-off defects and resulting quality and productivity losses due to scrapping of such defective metallized film.

Abstract: A flat type capacitor-use polypropylene film having a Ad(thickness determined by micrometer method—thickness determined by weighing method) of 0.05-0.2 ?m and a lengthwise shrinkage dimensional change rate of 3% or less, or a flat type capacitor-use polypropylene film having a ?d of 0.1-0.3 ?m and a lengthwise F5 value of 50 MPa or more, and a flat type capacitor using it. A film excellent in handling ability in a capacitor element winding process is obtained, and a small, a large-capacity flat type capacitor excellent in withstand voltage characteristics such as self-recovering property, and used suitably under a high rated voltage, is obtained.

Abstract: A flat type capacitor-use polypropylene film having a Ad(thickness determined by micrometer method—thickness determined by weighing method) of 0.05-0.2 ?m and a lengthwise shrinkage dimensional change rate of 3% or less, or a flat type capacitor-use polypropylene film having a ?d of 0.1-0.3 ?m and a lengthwise F5 value of 50 MPa or more, and a flat type capacitor using it. A film excellent in handling ability in a capacitor element winding process is obtained, and a small, a large-capacity flat type capacitor excellent in withstand voltage characteristics such as self-recovering property, and used suitably under a high rated voltage, is obtained.