US 10,802,391 B2 · Method of stripping films which are stuck together without damage

Abstract

A method of stripping films which are stuck together without damage is disclosed. The whole reel of films which are stuck together is placed in a sealing device with outlet valves. Liquid nitrogen is added at a bottom of the sealing device. The films are stripped off by a flow of gas through gaps between the layers of the films while the vaporization of liquid nitrogen. The present invention adopts a natural force of liquid nitrogen vaporization to strip the films, which does not compromise the PH value, the dimensional performance and the mechanical performance of the films. The films are stripped off without damage. The conventional method of stripping the films causes the fragile film to break off or the image layer with a decreased combing power to detach. The present invention has the advantages of simple operation, low cost and good promotion value.

Claims4

Dependent claims

A method of stripping films which are stuck together without damage, comprising steps of adding liquid nitrogen into a sealing device with safety valves;

hanging the films which are stuck together inside the sealing device horizontally;
setting the safety valves to automatically discharge gas when a pressure inside the sealing device reaches 0.10-0.50 MPa;
vaporizing the liquid nitrogen added in the sealing device for 30 to 150 minutes;
taking out the films when a temperature returns to a room temperature;
completing stripping of the films.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/074,213Filed 18 Aug 2017

Priority

CN 2017 1 002296912 Jan 2017

Published

US 2019/0332002 A131 Oct 2019

Granted

13 Oct 2020

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

G03D 15/00
Apparatus for treating processed material
G03D 15/043
Cutting; Splicing: cutting or splicing of filmstrips
B32B 38/10
Ancillary operations in connection with laminating processes: removing layers, or parts of layers, mechanically or chemically
B32B 43/006
Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor: delaminating

Method of stripping films which are stuck together without damage

Life of this patent

Method of stripping films which are stuck together without damage

Life of this patent

Abstract

Claims4