Polyester thermal contraction film with balanced thermal contraction performance and production method thereof

Abstract

The invention discloses a polyester thermal contraction film with balanced thermal contraction performance and production method thereof, the film is of three-layer construction: a top layer, a core layer and a bottom layer, wherein the component of the core layer is polyethylene terephthalate; the top layer and the bottom layer comprise parent material 15-25% wt and copolymerized modified polyester. The vertical, horizontal thermal contractions of the film are balanced and the vertical thermal contraction is about 65% and the horizontal thermal contraction is about 70% at 90-100DEG C; the vertical, horizontal tensile strengths are 240-260MPa. The process is mature with very strong operability, especially suitable for two-step tensile polyester film production line.

Description

technical field

[0001] The invention relates to a heat-shrinkable film and a manufacturing method thereof, more specifically to a polyester heat-shrinkable film with balanced heat-shrinking properties and a manufacturing method thereof Background technique

[0002] The heat-shrinkable plastic film is required to be stable at room temperature and shrink when heated (above the glass transition temperature and below the melting temperature). Heat-shrinkable labels are the main application fields of heat-shrinkable plastic films.

[0003] In addition to being used as shrink labels, heat-shrinkable plastic films have begun to be applied to the outer packaging of daily commodities this year, especially the packaging of items with different appearances, because it can not only protect the packaged items, but also make the items win with a beautifully printed appearance. user. On the other hand, heat-shrinkable plastic films have been used in pallet packaging in recent years, which...