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Rework Apparatus and Method for Pressure Sensitive Adhesive Tapes

IP.com Disclosure Number: IPCOM000240485D
Publication Date: 2015-Feb-03
Document File: 5 page(s) / 127K

Publishing Venue

The IP.com Prior Art Database

Abstract

Apparatus and methods to avoid difficulties in reworking Pressure Sensitive Adhesive tape in assembly of portable devices.

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This is the abbreviated version, containing approximately 50% of the total text.

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Rework Apparatus and Method for Pressure Sensitive Adhesive Tapes

Background:

Pressure Sensitive Adhesive (PSA) tapes are commonly used in the lens bonding application for electronic device. The tape construction is often made up of layers of PSA on both sides of a carrier material. The PSA tapes can be used in notebook, hand-held device, tablet PC and panel television applications to provide a faster and cleaner assembly process, replacing other solutions such as liquid adhesive. In addition, the use of PSA double-coated tapes also enable easier disassembly of the electronic device if rework is required. Figure 1 shows a use of heat and tool to rework a PSA foam tape material in a standard lens bonding application.

Figure 1 shows a use of heat and tool to rework a PSA foam tape

In a typical rework job, removing the bonded substrates from the bonded surface is often very difficult due to the strong adhesion of the PSA adhesive. This is particularly true when the application requires a very high bond strength and when the tape's width become narrower for a narrow frame design. It is not uncommon for rework to leave unwanted adhesive residue on the surfaces. This can lead to requiring cleaning issues often with solvent. In turn, this can have a significant effect on productivity. Figure 2 shows an example of adhesive residue on bonded surface in lens bonding application.


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Figure 2 shows an adhesive residue on bonded surface

New Rework Method:

Stretchable double-coated tapes have recently been developed which successfully provide both a bonding solution as well as a preferred de-bond solution for cover lens application. The stretchable tape is comprising the pressure sensitive adhesives (PSA) coated on the both sides of a polymer core. In order to improve the strength of the PSA tape to the rework solution, some polymer core are chosen as the carrier material. Tabs are added on the tail of the tape, to facilitate tape removal under the appropriate force. The new rework method shows minimal/no adhesive residue on the bonded surface in Figures 3.

Figure 3 shows minimal/no adhesive residue on the bonded surface

When rework is needed, the cover glass can be separated by stretching the PSA tape which follow the standard operation guide. Unlike the traditional rework, the heat sources and tools are not required for the new process. Furthermore, since the PSA tape can be removed cleanly from the both the cover glass and the metal frame surfaces of LCM, rework can be completed without standard adhesive residue problems. In fact, the strong PSA tape is designed to be stretched at room temperature from the substrates. Figure 4 showed the cover lens can be separated by stretching the


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PSA tape.

     Figure 4 shows cover lens can be separated by stretching the PSA tape Real Demo with Rework Apparatus:
For a real implementation, the rework apparatus comprises a novel frame support with the adjustable roller vertical position to...