Film processing device and method

Abstract

The invention discloses a film processing device. The film processing device comprises a transverse pulling box and a transverse pulling unit, the transverse pulling unit comprises a transverse pulling pinch roll unit and a transverse pulling cutter unit which are arranged in the transverse pulling box, and the transverse pulling box comprises an N3 area, a first cooling area and a second cooling area which are sequentially arranged in the transverse pulling box in the traction direction of a film. The transverse pulling pinch roll unit comprises at least two sets of pinch roll groups. The at least two sets of pinch roll groups are separately arranged in the first cooling area and the second cooling area. Each set of pinch roller group is used for clamping the two sides of the film in the width direction. The transverse pulling cutter unit and the transverse pulling pinch roll unit are sequentially arranged in the traction direction of the film, and the transverse pulling cutter unit is arranged in the N3 area and used for cutting the edge of the film. The invention further discloses a film processing method, the film can be separated from the clamping of a chain clamp before entering the cooling areas, the longitudinal thermal shrinkage rate is improved, and the problem that the film is wrapped due to the fact that the film is beaten towards the middle under the action of no transverse tension is solved.

Description

technical field [0001] The invention relates to a film pulling device, in particular to a film processing device and a processing method. Background technique [0002] The main function of the transverse drawing machine (TDO) is to heat and stretch the film sheet transversely, so that the film thickness is uniform and the mechanical properties are stable. The horizontal stretching machine has two special chains that rotate endlessly. There are clamps on the chains, which can tightly clamp the two edges of the sheet and support them on the guide rails with variable width. With the help of the same direction of the two chain clamps, run synchronously. The sheet is firstly preheated in a slightly increased preheating section, then transversely stretched in a stretching zone with a larger expansion angle, and then heat treated in a parallel and shrinking heat treatment zone to shape and relax the film. Finally, cooling is carried out in parallel cooling zones to complete the t...

AI Technical Summary

Problems solved by technology

The first method is the synchronous stretching method, that is, the magnetic levitation chain clip is used for the horizontal zipper clip. When the chain clip is running on the horizontal pull track, each chain clip has a motor that can run independently in the track. Speed ​​operation, so that the clamped film has longitudinal and transverse tension, but the cost of this method is extremely high, the cost is increased by about 100 million yuan, and the longitudinal traction is small, only used in the preparation of films below 12μ, and the structure is complicated, The failure rate is also high; another method is to use the chain clip system with chain shrinkage function. The distance between the chain clip and the chain clip is not fixed. Forcibly shorten the distance between the chain clamp and the chain clamp by about 1cm, so that the film can release the stress in the longitudinal direction, and the film has shrinkage space in the longitudinal direction, so that the longitudinal thermal shrinkage rate can be improved. This method can be used for films below 250μ, but the The system needs an additional cost of 50 million RMB, and because the steel belt of the track is greatly affected by the shrinkage mechanism, the load of the steel belt is heavy, and it is easy to cause serious failures such as elongation, deformation and fracture of the steel belt of the horizontal tension track. The manufacturer recommends that it should be replaced every year The steel belt in the horizontal cooling zone will cost an additional 600,000 per year

[0006] For 99% of the current domestic production lines, the above two methods involve huge investment and a long transformation period, and the cost-effectiveness for only improving the longitudinal thermal shrinkage rate among many properties is relatively low.

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