Patent ID: 11958985
Assignee: NAN YA PLASTICS CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC B  C  Y | IPC B  C

Claim 5:
6. A method for manufacturing a heat sealable polyester film, comprising:
physically reproducing a part of a recycled polyester material to obtain physically regenerated polyester chips, and the physically regenerated polyester chips including physically regenerated polyester chips;
chemically reproducing another part of the recycled polyester material to obtain chemically regenerated polyester chips, and the chemically regenerated polyester chips including chemically regenerated polyester chips and chemically regenerated electrostatic pinning polyester chips;
mixing modified polyester chips with the physically regenerated polyester chips and the chemically regenerated polyester chips to form a raw material mixture;
wherein the modified polyester chips are formed from the recycled polyester material,
wherein the modified polyester chips consist of regenerated polyethylene terephthalate and polybutylene terephthalate, and is formed by fusing the polybutylene terephthalate and the recycled polyester material;
wherein, based on a total weight of the physically regenerated modified polyester chips being 100 wt %, a content of PBT ranges from larger than 0 wt % to 30 wt %; using the raw material mixture to form a heat sealable layer; and

disposing a base layer onto the heat sealable layer so as to obtain the heat sealable polyester film;
wherein the base layer includes a main component of regenerated polyethylene terephthalate with a first melting temperature;
wherein a heat sealing temperature of the heat sealable polyester film is lower than the first melting temperature in a range from 120° C. to 230° C.