KR900700270A - Manufacturing method and apparatus of plastic thin film and thin film reel - Google Patents

Abstract

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Description

Manufacturing method and apparatus of plastic thin film and thin film reel

As this is a public information case, the full text was not included.

1 is a schematic diagram of an apparatus for producing and using a film embodying the present invention,

2 is a schematic diagram of a dance roll system,

3 shows the air cylinder in more detail.

Claims (15)

The plastic resin film 12 is characterized by being able to be wound (45) for use after being stretched for a certain period of time (X; Y) under the condition that the effect of elastic memory is reduced (45) before using or winding the stretched film. 16. A method of making a film, wherein said film is stretched (16) sufficiently to extrude and dimensionally stabilize and to reduce the thickness of said stable film. A process according to claim 1 wherein the residence time is at least 3 seconds and preferably at least 7 seconds. Method according to claim 1 or 2, characterized in that the film is kept under low elongation (36) for residence time. The method according to any one of the preceding claims, wherein the length of the film is reduced to a controlled amount during the residence time. The production method according to any one of the preceding claims, wherein the retention time conditions are selected so that the resulting film can be recovered so that the shrinkage in the machine direction does not exceed 5%. The method according to any one of the preceding claims, wherein the film is passed around a dance roll (36) in which the position can be automatically displaced (50-68) during the residence time to stabilize the film stretching force. 7. The method according to claim 6, wherein the film can be stretched with a series of rollers 18, 20, 22, and the speed 24 of the last stretch roller 22 can be adjusted regardless of the position and film speed of the dance roller 36. Manufacturing method. The production method according to claim 7, wherein the film speed at the end of the residence time is measured (70) and used for a control operation. 9. A method according to any one of claims 6 or 8, wherein the position of the dance roll (36) is determined with an air cylinder (60) using floating pistons (56, 62). A method according to any of the preceding claims, wherein the film is stretched with a series of stretching rollers (18, 20, 22) in which the film contact surface is a rubber tissue. The process according to any of the preceding claims, wherein the film is made of LDPE and / or LLDPE. The film routing unit is characterized in that the film is wound so that it can be used later after being stayed for a certain time under the condition of reducing the influence of the elastic memory by using a film routing means. And 44,70) and apparatus for producing plastic resin thin films with real or use place (45). 13. Apparatus according to claim 12, wherein control means are included at each end of the film path to allow the respective rollers (22,70) and also the downflow rollers (70) to operate at lower film speeds than the upflow rollers (22). 14. Apparatus according to claim 12 or 13, wherein the means for deciding the film path comprises a dance roll (36) and means for automatically displacing it (50-68) to stabilize the film stretch force. An extruded plastic resin film reel which has a recovery tendency which extends in the machine direction and is recovered and the resulting recovery tendency is 5% or less in the machine direction. ※ Note: The disclosure is based on the initial application.