Film made of multi-layer heat-shrink plastic material

摘要

The multilayer heat-shrink film comprises: a central first layer made up of a first composition comprising polyolefin; intermediate second layers that are made up of a second composition and cover respective faces of the first layer, where the second composition comprises a styrene-based resin; and outer third layers that are made up of a third composition and cover respective ones of the intermediate second layers. The third composition comprises polyester. The central first layer has thickness lying in a range of 55-70% of the total thickness of the film. The multilayer heat-shrink film comprises: a central first layer made up of a first composition comprising polyolefin; intermediate second layers that are made up of a second composition and cover respective faces of the first layer, where the second composition comprises a styrene-based resin; and outer third layers that are made up of a third composition and cover respective ones of the intermediate second layers. The third composition comprises polyester. The central first layer has thickness lying in a range of 55-70% of the total thickness of the film. The intermediate second layers have thickness lying in a range of 15-30% of the total thickness of the film. The outer third layers have thickness lying in a range of 15-30% of the total thickness of the film. The outer third layers comprise a compound having an emission spectrum in the near infrared that is centered on a wavelength of 1400-1900 nm. The compound is a varnish covering the free surfaces of the two outer third layers. The compound is incorporated in the third composition such that the two outer third layers have an emission spectrum in the near infrared centered on a wavelength of 1400-1900 nm.