Double backed tape

The electron spectra discussed were taken on woven pieces or fibers attached to double backed tape in a manner such that minimal tape was exposed. The effect of surface uniformity and density was investigated by comparing the spectra taken from wool fibers and from wool fibers compressed into thin continuous transparent films. Wool fiber or woven textile can be pressed into thin transparent films by applying pressure to moist samples between heated plates in a hydraulic press (45). 

The nitrogen and sulfur electron spectra obtained from individual fibers attached to double backed tape and pressed into a film are shown in Figure 17. The electron line intensities of the spectra obtained from these two samples are given in Table IV. In general, the electron lines from the smooth dense film were three times as intense and thirty percent narrower than the electron lines obtained from fibers. The position of the lines were identical. 

Double-backed tape is generally used in laminating one substrate to another. Often the carrier film and adhesive are transparent to allow parts to be viewed through the tape. Certain ofQce product tapes are double-backed tape having a clear carrier and a clear pressure-sensitive adhesive on both sides of the carrier. 

Instead of using a single layer of adhesive, tapes with two layers of adhesive, which can be of the same or different type, have also been constructed. Here, a thin film backing may be used as the central layer of the tape, with the adhesives coated on each side of the backing. This type of tape construction is commonly referred to as a double-stick or double-faced tape. 

Step 5. Fasten disk to center of planchet with double-sided tape at the back of the disk. Count sample. Repeat with 2 other samples and blank with proportional counter. 

Step 27. Disassemble the filter funnel. With tweezers or forceps, carefully remove the membrane filter and fix with double-sided tape at the center of a 5-cm planchet that has been etched with an identification number on its back. 

Much of the remainder of the pool was covered with the SAPER-T tiles. These were comparatively cheap ( 50/sq.ft.) but contributed only 4 to 5 dB ER, as shown in figure 9. These tiles were used in this application primarily as an inexpensive low frequency reverberation reduction coating. (The reduced performance measured for these tiles in this application is a consequence of the unfavorable backing impedance presented by the thick concrete walls and method of attachment which used double stick tape instead of a rigid adhesive bond.)... 

Quantitative conductivity of a CP sample is typically measured by a four-point probe technique. CPs for biomedical applications have typically yielded conductivities of between 1 and 200 S cm [44—46,49,50,138]. However, four-point probe measurements can be problematic, as the CP film must be removed from the substrate prior to testing. There have been a number of different methods used for film removal, including doublesided tape, razor blades, and backing the film with polydimethylsiloxane (PDMS) [61]. Fonner et al. found the double-sided tape technique to be most effective, as the CP film was removed firom the substrate undamaged and the presence of the tape did not affect the conductivity measurement [61]. 

Pressure-sensitive adhesives are specifically formulated for good flexibility, tack, and peel strength. Most pressure-sensitive adhesives are applied to plastic, paper, foil, or fibrous material as suitable backings. Pressure-sensitive tapes are made with adhesive on one side or on both sides (double-faced tape). Double-faced foam tapes are available to suit applications where substrates have surface irregularities, contours, and significant gaps in the bond line. 

Synthetic fibers and textiles are not the only type of polymer evidence analyzed by forensic chemists. All kinds of materials, such as building materials and PVC pipes, may be submitted as exhibits. Among the more frequent types of evidence are adhesives and tapes, most of which are based on or include polymeric substances. Tape is also frequently used to collect evidence fibers are often collected by adhesion to inside-out rolls of tape. Gunshot residue can also be collected this way. Tapes of the most forensic interest consist of a polymer backing with a pressure-sensitive adhesive coated on one or both sides, as in the case of double-sided tape. Within this group are foimd cellophane tape (informally, "Scotch tape"), as well as duct, packing, and electrical tape. 

The coating can be applied directly to the web or to a release liner and subsequently transferred to the web. The latter method is often used for double-sided tapes with foam backings, for it eliminates the influence of solvent and high temperature on the substrate. 

Double-sided tapes usually are used to attach substrates to one another therefore, the adhesive is of primary importance. Generally, the backing material, if present, must assist the handling. 

Most adhesive tapes are composed of a flexible backing (paper, plastic, cloth, metal foil, etc.) to which a pressure-sensitive adhesive has been applied to one side (both sides for double-sided tapes). Pressure-sensitive adhesives typically consist of a rubbery material with a modifying tactifier that may be applied to the tape by a solvent system, hot melt, or by other means. One would expect such materials to be sensitive to the mode of stress (tensile versus shear) in the region where debonding occurs. Furthermore, since tacky rubbers of the type used in pressure-sensitive adhesive are viscoelastic, one would anticipate material properties to be time- and rate-dependent. Are these expectations consistent with the observations from your simple peel test ... 

Samples of the 300-400 and <63p,m fractions were mounted on aluminium pedestals using carbon based double sided tape, and coated with carbon by vacuum evaporation. These were viewed in both secondary electron (SE) and back-scattered electron (BSE) mode using a Camscan series 4 Scanning Electron Microscope. Heavy metal contaminated particles were identified by their high BSE luminescence. Points on individual particles were analysed under the SEM with a Link AM 10,000 Energy Dispersive X-ray Analysis System. The depth of penetration for this method varies with the atomic number,... 

For SEM examination the same amount of the starting suspension was filtered on a polycarbonate filter, 0.2 /am pore size and 25 mm diameter, placed on a backing cellulosic filter of 1.2 /am pore size, in order to facilitate a more uniform distribution of particles on the filter. A small portion of the particles-laden filter was then mounted on SEM stubs by double sided sticky tape and then coated by gold of about 300 nm thick in a sputter coater [11]. 

Double-sided adhesive tapes (G L Precision Die Cutting, Inc. San Jose, Cat. No. GL-187) are used for making adhesive layers on the backing plate. 

Single- and double-sided self-adhesive tapes come in many forms and sizes, using a variety of backing materials such as - cellulose, polyester, foamed polyurethane and PVC. The adhesive is usually based on a tacky, semi-solid acrylic polymer which may be used with a release strip. Some special tapes are heat activated. 

Midazolam, verapamil, and metoprolol were resolved using ethyl acetate containing 0.5% ammonium hydroxide on monolithic UTLC glass-backed plates. The plates were prewashed once with acetonitrile before sample application. The UTLC plates were attached to the face of an in-house-modified AP-MALDI target plate with double-sided conductive tape after cutting the plate to match the target probe. 

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