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Method of making a privacy film

A security, thin-film technology for use in polymer-based security films for easy fabrication and flexible construction

Inactive Publication Date: 2008-12-17
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method is similar, where the user can view the image on the document, but restricts onlookers to view the content of the document

Method used

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  • Method of making a privacy film
  • Method of making a privacy film
  • Method of making a privacy film

Examples

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example 1

[0045] Confidentiality films, usually based on Figures 8a to 8c Make it as follows. A copper plate is machined and channels are made on it to create a microstructured tool. Each channel has a height dimension (measured along its minor axis) of 19.3 mils (0.5 mm) and is sloped at an angle of 63.1 degrees. The tip of each channel has a dimension of 3.8 mils. The base of each channel has a dimension of 6.9 mils (0.18 mm) measured along a line lying in the same plane as the floor area. The base has a dimension of 5.5 mils (0.14 mm), measured along a line parallel to the tip, close to the base. The floor area distance from one edge of the channel to the nearest edge of the next adjacent angle is 4.9 mils (0.12 mm).

[0046] Contains 2 wt% TiO 2 A pigmented polypropylene film was used as the thermoplastic polymer film. The polypropylene film was 5 mil (0.13 mm) thick. The film was directed into the channel for 30 seconds at a pressure of 160 pounds per square inch (psi) usin...

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Abstract

A method of making a privacy film includes generally the following steps: providing a polymeric material, depositing the polymeric material onto a microstructured mold comprising a plurality of substantially parallel, elongated channels with specific geometry; inducing the polymeric material to flow into the channels of the microstructured mold; solidifying the polymeric material inside the channels to yield a plurality of light directing elements that are connected with one another via a polymeric base sheet; and separating the privacy film from the microstructured mold.

Description

technical field [0001] This invention relates to privacy films. In particular, the present invention relates to polymer-based security films having a plurality of light directing elements each disposed substantially parallel to the next adjacent light directing element, the films being well suited for use in document . Background technique [0002] There are already many products that can provide consumers with confidentiality. For example, it is now commonplace for most personal computers or automated teller machines to include a privacy screen, which allows a user to view images on the monitor while limiting viewing by bystanders (or at least those not within the viewing angle of the screen). For users whose documents contain sensitive materials, some products already use light control films to provide privacy. The approach is similar, where the user can view the image on the document, but restricts onlookers from viewing the content of the document. [0003] Various l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/42B29C43/02
CPCB29C33/424B29C59/022B29C2059/023G02B5/00Y10S283/901Y10S283/902Y10S428/916Y10T428/14Y10T428/24372Y10T428/2457Y10T428/25B29C33/42B29C43/02
Inventor 保罗·D·格雷厄姆格雷厄姆·M·克莱克
Owner 3M INNOVATIVE PROPERTIES CO