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KR-102964197-B1 - Multi-laminated film to protect the glass of a high-speed train vehicle

KR102964197B1KR 102964197 B1KR102964197 B1KR 102964197B1KR-102964197-B1

Abstract

A film laminate bonded to the glass of a high-speed railway vehicle according to one embodiment of the present invention comprises: a UV film layer; a primary PET film layer formed below the UV film layer and formed to protect against impact caused by flying debris; a TPU film layer bonded below the primary PET film layer to absorb the impact; a secondary PET film layer formed below the TPU film layer to absorb residual energy transmitted through the TPU film layer; a self-healing TPU film layer bonded below the secondary PET film layer to restore deformation caused by the impact; and a pressure-sensitive adhesive layer formed below the self-healing TPU film layer.

Inventors

  • 정성호
  • 정인철
  • 정준화

Assignees

  • 주식회사 중앙첨단소재

Dates

Publication Date
20260513
Application Date
20240215

Claims (4)

  1. UV film layer; A primary PET film layer formed below the above UV film layer and formed to protect against impact caused by flying debris; A TPU film layer bonded to the lower part of the primary PET film layer to absorb the above shock; A secondary PET film layer formed below the TPU film layer to absorb residual energy transmitted through the TPU film layer; A self-healing TPU film layer bonded to the lower part of the secondary PET film layer to restore deformation caused by the above impact; and It includes a pressure-sensitive adhesive layer formed on the lower part of the self-healing TPU film layer, and The thickness of the above primary PET film layer is formed to be the thickest among all layers, and The thickness of the above self-healing TPU film layer is formed to be the thinnest among all layers, and The thickness from the UV film layer to the self-healing TPU film layer is 0.6 mm or more, and The above primary PET film layer comprises a grid-shaped high-density portion and a low-density portion formed within the grid of the grid-shaped high-density portion, and The above low-density portion has a uniform density of PET resin from the center to the above high-density portion, and The above secondary PET film layer comprises a grid-shaped high-density section partitioned according to the density of the PET resin and a low-density section formed within the grid of the grid-shaped high-density section. A film laminate bonded to the glass of a high-speed railway vehicle, characterized in that the density of the PET resin increases stepwise from the center of the low-density portion to the high-density portion.
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Description

Multi-laminated film to protect the glass of a high-speed train vehicle One embodiment of the present invention relates to a film laminate bonded to glass to protect glass formed in a high-speed railway vehicle. The phenomenon of ballast scattering on the track during high-speed operation of railway vehicles not only causes damage to the vehicles and facilities but can also pose a significant threat to the safety of personnel and facilities on platforms and around the tracks. Two examples of causes for this ballast scattering are the train wind generated under the vehicle body during high-speed operation and ice chunks (snow and ice) that stick to and detach from the vehicle during winter snowfall. Train wind is a turbulent flow induced by the boundary layer formed on the vehicle surface; it is characterized by forming much more strongly under the vehicle than on the sides or top due to the complex shapes of the bogies and vehicle connections. Typically, a train wind of about 30 to 50 m/s is generated between the underside of a high-speed railway vehicle traveling at a speed of 200 to 300 km/h and the ballast surface. Due to this train wind, light ballast in the surface layer rolls and bounces up upon hitting other ballast or sleepers. Another cause of ballast scattering, the phenomenon of falling snow and ice, occurs in snowy areas during winter and has a more complex mechanism than ballast scattering caused by train wind. When a train travels at high speed on a snow-covered track, the snow is blown by the train wind beneath the vehicle, and this blown snow settles in areas where airflow stagnates under the vehicle body. The settled snow is compacted by wind pressure or repeatedly freezes and thaws due to changes in external temperature, causing it to clump together tightly. As these tightly clumped snow or ice blocks fall due to temperature changes or weight, they collide with the ballast along the track, scattering the ballast. When such scattered gravel collides with the underside of the train body, it accelerates to a speed equivalent to the train's speed, gaining significant kinetic energy. This gravel then scatters at high speeds around the tracks or collides with other gravel on the track, instantaneously causing a chain reaction of scattered gravel that damages the vehicle, the tracks, and the lives and facilities surrounding the tracks. In particular, the impact on the windows of high-speed trains caused by flying debris such as gravel poses a serious threat to the stability of vehicle operation, so measures to address this can be considered. FIG. 1 is a cross-sectional view of a film laminate bonded to the glass of a high-speed railway vehicle according to one embodiment of the present invention. FIG. 2 is a conceptual diagram of a primary PET film layer according to one embodiment of the present invention. FIG. 3 is a conceptual diagram of a secondary PET film layer according to one embodiment of the present invention. FIG. 4 is a conceptual diagram illustrating a mechanism in which impact is absorbed or dispersed when an impact is applied to a film laminate bonded to the glass of a high-speed railway vehicle illustrated in FIG. 1. Figure 5 is a photograph of the test results on the window glass of a high-speed train. Specific embodiments for implementing the present invention are described below with reference to the drawings. The embodiments of the present invention are intended to illustrate a single invention, and the scope of rights is not limited to the exemplified embodiments. Furthermore, the exemplified drawings should not be interpreted as being limited to the drawings, as they only illustrate the essential details and omit incidental details for the clarity of the invention. The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification and do not inherently possess distinct meanings or roles. In this specification, identical or similar reference numbers are assigned to identical or similar components even for different embodiments, and the description thereof is replaced by the first description. Singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. FIG. 1 is a cross-sectional view of a film laminate bonded to the glass of a high-speed railway vehicle according to one embodiment of the present invention, FIG. 2 is a conceptual diagram of a primary PET film layer according to one embodiment of the present invention, and FIG. 3 is a conceptual diagram of a secondary PET film layer according to one embodiment of the present invention. Referring to FIGS. 1 to 3, a film laminate (100) bonded to the glass of a high-speed railway vehicle according to one embodiment of the present invention includes a UV film layer (110), a primary PET film layer (120), a TPU film layer (130), a secondary PET film layer (140), a self-he