Heat sealable polyester film and method for manufacturing the same

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 regular 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 regular 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, the modified polyester chips include regenerated polyethylene terephthalate as a main component, and the modified polyester chips further includes at least one of 1,4-butanediol, isophthalic acid, neopentyl glycol, and polybutylene terephthalate;
• 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 a heat sealing temperature of the heat sealable polyester film ranges from 120° C. to 230° C.

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, the physically regenerated polyester chips including physically regenerated regular polyester chips;
• chemically reproducing another part of the recycled polyester material to obtain chemically regenerated polyester chips, the chemically regenerated polyester chips including chemically regenerated regular 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, so as to form a raw material mixture;
• wherein the modified polyester chips are formed from the recycled polyester material, the modified polyester chips include regenerated polyethylene terephthalate as a main component, and the modified polyester chips further include at least one of 1,4-butanediol, isophthalic acid, neopentyl glycol, and polybutylene terephthalate;
• mixing the physically regenerated polyester chips and the chemically regenerated polyester chips to form a base material;
• and
• co-extruding the raw material mixture and the base material so as to form the heat sealable polyester film;
• wherein the heat sealable polyester film includes a heat sealable layer formed from the raw material mixture and a base layer formed from the base material;
• wherein a heat sealing temperature of the heat sealable polyester film ranges from 120° C. to 230° C.