Kapton® strips

The matrix can be taken away by HN03 except at the ends of the wire, to allow easy soldering. Below IK, the electrical contact can be done also by squeezing the wires to be connected inside a thin A1 tube (see, for example, Section 12.4). For low-level signals, shielded twisted pairs or cryogenic coaxial cables are used. When thousands of wires are necessary, as in large experiments, Kapton strips with deposited conductors [3] or woven wires [4] are used. 

Ink-jet printing provides another opportunity to fabricate resistive humidity sensors. Different sensor configurations have been investigated using an ink with silver nanoparticles (Weremczuk et al., 2012). Likewise, thin film technologies were applied to develop resistive temperature elements onto Kapton strips, which were subsequently woven into a textile (Zysset, 2013). 

Some other methods have similarities to ancient methods where metallic surfaces are applied to strips. For example, a conductive bus stmcture created using Kapton strips with an 18-pm thick copper layer on top is described by Zysset (2013). 

An improved process and equipment for cast PTFE films have been developed, which have considerably higher productivity than the method and equipment described above.14 The process essentially uses a vertical coater with multiple stages. The carrier belt has to be made from a material of low thermal mass which can tolerate repeated exposure to the sintering temperature and has surface properties such that it can be wetted by the dispersion, yet the film can be stripped without being stretched. There are several possible belt materials, but KAPTON H (DuPont) was found to be particularly suitable because of its heat resistance, dimensional stability, and surface characteristics.14 The production speeds used in this process are 3 to 10 m/rnin (9 to 30 I t/min). 

A flexible Kapton -coated heater is wrapped aroimd the clamshell and is powered using a 24 VDC input. The temperature of the clamshell is monitored using two 100 O platinum Resistive Temperature Devices (RTD s). Both the DieMate manifold and the clamshell heater are insulated using ceramic fiber strip obtained from a commercial source with a maximum temperature rating of 2300 F. 

In order to measure the temperature with accuracy, researchers have focused their efforts on the integration of sensor strips within a textile stmcture. To do so, they used polymeric film, mostly Kapton (Ataman et al., 2011) as base substrate, on which they deposited thin metal layers. Techniques of photolithography, inkjet printing or spin coating have been used and combined to create the desired pattern. The choice of metallic materials is wide from silvCT, gold, titanium and platinum. 

Pig. 7.2 Picture of a BPIX half module left) and fuU module (right). Center the components of a pixel barrel detector module (from top to bottom) the Kapton signal cable, the power cable, the HDI, the silicon sensor, the 16 ROCs and the base strips... 

In order to remove the cast elastomer film from the Teflon support, a strip of Kapton based adhesive tape is fixed at one end of the swollen gel. Kapton is used as it can withstand high temperatures and is stable towards organic solvents. The film is now removed from the support by slowly pulUng the tape. In some cases it is useful to rinse the space between the elastomer film and the Teflon foil with toluene. The elastomer film is fixed at a metal holder and hung vertically. At the lower end of the film a small load, e.g., a paper chp, is attached and held steady with Kapton tape from both sides (Fig. 10). 

Fig. 11 Photograph of the LSCE preparation according to the two-step crosslinking procedure under mechanical load after Kiipfer. The elastomer strip is fixed using Kapton adhesive tape...

Details of the front-end circuitry depend strongly on the design of the detector readout, as the added capacitance of the second layer metal and the resistance of the readout lines and strip electrodes substantially affect the noise characteristics. Minimizing these additional contributions is an important part of the front-end design. Utilization of a separate kapton laminate for the second layer z-readout should reduce both capacitance and cost. 

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