Method for determining length of film by thermally stretching film

A technology of thermal stretching and thin film, which is applied in printing, rotary printing machine, printing machine, etc., can solve the problems of insecurity, film deformation, positioning and printing loss, etc., and achieve the effect of simple structure, preventing breakage and preventing control confusion

Active Publication Date: 2013-07-03
广东东南薄膜科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to many reasons such as tension, pressure, temperature adjustment in the production process, sudden acceleration, deceleration, and shutdown of the drive motor, the film is deformed, and the length of the film after stretching is difficult to achieve the same length as the predetermined length of each plate, and the second time cannot be guaranteed. When printing, the accuracy of pattern overprinting will cause greater loss to positioning printing, etc.

Method used

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  • Method for determining length of film by thermally stretching film

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] In order to better adopt the film thermal expansion and fixed length method of the present invention to stretch and fix the film, the film thermal expansion and fixed length device as shown in the accompanying drawing is adopted, and the device includes: an unwinding device 1 and a winding device 2 , a heating device 3, a support roller 5 arranged in the traveling direction of the film 4, a control system, a first traction roller 6, a second traction roller 7, a length measuring roller 8, a photoelectric eye 9, a tension fine-tuning mechanism and an ironing roller 10; The first traction roller 6 is located at the place ahead of the heating device 3, and the second traction roller 7 is located at the rear of the heating device 3; the driving motors of the first traction roller 6 and the second traction roller 7 are electrically connected with the control system respectively; the unwinding device 1 is arranged in front of the first traction roller 6, and the winding device...

Embodiment 2

[0033] In the case that other parts are all the same as in Embodiment 1, the difference is that: in step (1), the oven 31 heats the film 4 to 180°C; in step (2), the first pulling roller 6 and the second pulling roller 7 The tension applied to the film 4 was 0.1N.

[0034] Embodiment two

[0035] In the case that other parts are all the same as in Embodiment 1, the difference is that: in step (1), the oven 31 heats the film 4 to 105°C; in step (2), the first pulling roller 6 and the second pulling roller 7 The tension applied to the film 4 was 75N.

[0036] In other embodiments, the oven may be replaced with multiple heated rolls.

[0037] In other embodiments, a cooling roll may be arranged behind the second pulling roll to cool the film.

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Abstract

The invention relates to a method for determining the length of a film by thermally stretching the film, which is characterized by comprising the following steps of: (1) heating the film by using a heating device in the process of conveying the film; and (2) applying tension along the advancing direction of the film to the film at the two ends of the heating device to stretch the film so as to make the film meet the predetermined length requirement. The film is heated when advancing, and the tension is applied to the heated film at the two ends of the heating device, so that the film accurately reaches the predetermined stretched length, and the film is not deformed; a first pulling roller and a second pulling roller are arranged to convey the film, and the tension applied to the film is formed by the pulling speed difference of the two pulling rollers, so that the tension applied to the two ends of the film is more uniform, the film is prevented from being broken, the stretching effect is better, and the film has a simple structure; and a closed loop control mechanism, an actual length checking mechanism and a tension fine adjustment mechanism are further arranged, so that the length of the stretched film is more accurately determined.

Description

technical field [0001] The invention relates to a film processing method, in particular to a film thermal expansion and length fixing method. Background technique [0002] Whether it is in-line positioning printing or offline positioning printing, it is necessary to solve the problem of the repeating length and equidistance of the color mark during the second overprinting, and to make the newly printed pattern and the original pattern have the same characteristics through secondary printing on the film with the existing pattern printed. Precise overprinting relationship must use stretching and fixed-length technology to ensure overprinting accuracy. [0003] At present, the method of film stretching and fixed length is generally used to stop the production equipment, then measure the length of each version of the film, and then control the length of each version of the film by adjusting parameters such as tension, pressure, and temperature. Due to many reasons such as tensi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41F23/04B41F13/02
Inventor 蔡旭楠陈松青林晓新
Owner 广东东南薄膜科技股份有限公司
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