Double-faced tape

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. 

Samples of microspheres were mounted on aluminum specimen mounts by means of double-faced tapes. The microspheres were fractured with razor blades to expose the internal matrix. The samples were then coated with approximately 125 of gold by pulsing the sputter coater to avoid the possibility of artifact caused by heat generation. Secondary emissive scanning electron microscopy was performed with an Amray 1600 Turbo scanning electron microscope. 

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. 

The card webs, after the second carding, were placed on top of a paper-thin, spun-bonded non woven and secured with double faced tape. This spun-bonded material, carrying along the card web, was fed into a James Hunter Fiber Locker - a needle-punch machine, with a needle density of 81 needles per square inch. Several needled fabrics were produced in this manner ... 

PVC Pressure-Sensitive Tapes. Formulated PVC plastisols are used in automotive applications. A pressure-sensitive adhesive-coated closed-cell PVC tape has replaced butyl glazing tape in some glazing applications. Other applications include automotive, trucks and trailers, mobile homes, steel building erection, metal door gasketing, and sound deadening. Both single-face and double-face tapes are available in various thicknesses, widths, and densities. The pressure-sensitive adhesive is believed to be of the acrylic type. 

A section of the epoxy sample, approximately 2cmx2cm, was removed from the bulk and mounted onto the XPS sample stage. The sample was mounted with the "titanium" side facing down, by way of double-sided tape. Thus, the "composite side" was analyzed. The composite tube was prepared similarly and the sampling area was selected so as not to include the first 5 mm or beyond 30 mm from the end of the tube. The regions in the first 5 mm and the area beyond 30 mm from the end were classified as the non-bonded regions. Thus, the "epoxy side" or outer surface side of the composite tube was analyzed in the "bonded region". 

For emulsion tests, polyamide-coated terephthalate plastic plates are attached powder-side down by double-faced transparent tape strips to the undersurface of the lid of 9 x 1 cm Pyrex Petri dishes. The plates, 2x3 cm, are cut from standard 20 x 20 cm polyamide-terephthalate plates used for thin-layer chromatography. They are Polygram - Polyamide-6 UV254, procured from Macherey-Nagel and Co. through Brinkmann Instruments, Inc., Westbury, N.Y. As indicated, they contain a fluorophore (zinc silicate) activated by short-wave UV, but not active in the 360-nm range used herein. 

The metallic layers were examined either by conventional or cross-section TEM in a Jeol 200 Cx microscope. For the cross section preparation a sandwich of two laminates is made, glued face to face with an epoxy, cut in small pieces, mechanically polished, and then ion milled to a final TEM observation thickness. The plane section TEM sample are prepared by dissolving the PET in trifluoroacetic acid for 5 to 10 mn. The area observed, on plane section TEM, for the grain size calculation is close to 0.2 urn. For the adhesion measurements, test pieces consist of aluminum support (1 mm thick) double sided tape (Permacel P-94) PET (12pm) / evaporated aluminum/ ethylene acrylic acid (EAA) copolymer film. These laminates are prepared for the peel test by compression under 1.3 105 N.m2 at 120°C for 10 seconds. The peel test is performed by peeling the EAA copolymer sheet from the laminate in an INSTRON tensile tester at 180° peel angle and 5 cm min peel rate. 

Put the 3MM paper strip (with embryos facing down) gently onto a strip of double-stick tape inside a plastic Petri dish and press very gently in the center and sides so that the embryos stick firmly to the tape. Remove the paper and immediately cover the embryos with about 200 J.L of PBTA solution. The embryos are then ready to be dechorionated. 

Thin double-faced adhesive tape or Parafilm. 

Prepare glass slides with two small stripes of double-faced adhesive tape or Parafilm. The spacing between the stripes should be 4-10 mm. 

For samples of a few millimeters in diameter, thinned sections can be glued to a polished metallic cylinder using one of the epoxy resins described above or afixed using double sided tape. The latter will, however, de-gas more heavily. For even larger sized samples, a Petro-graphic cross-sectional disc should be cut with the face of interest polished in the same manner as mentioned earlier. This can be a stand-alone disc or may be supported in an epoxy resin puck of dimensions amenable to the sample holder to be used. On the other hand, a thinned section can be supported on a glass slide or amenable dimensions along with a suitable reference material. The epoxy preparation will be similar to that above. 

The fibers morphology was evaluated in a scanning electron microscope JEOL JSM5310 with a tungsten filament operating at lOkV, employing low vacuum technique and secondary electron detector. Samples were dispersed on a brass support and fixed with a double face 3M tape. 

The second stage of the sample preparation is the elaboration of the striped sample. A mask is prepared from an aluminum sheet, with stripe shaped windows of 1 mm width, separated by a 1 mm spacing. This mask is placed over the sample, using double face self-adhesive tape on the edge (Figure l.b). Special care is taken to flatten the mask on the sample. 

A section of the film was removed from the bag and was immersed in liquid nitrogen. The section was then freeze-fractured and mounted on the SEM stage with the outside surface of the bag section facing downward. The sample was sputter coated prior to SEM/EDS analysis. Sputtering was performed to deposit approximately 20 nm of gold/palladium onto the sample. Double-sided conductive tape was used to ensure that the sample was sufficiently grounded to... 

Unless stated otherwise, hands were sampled by tape lift (adhesive stub) for inorganic FDR using a 13-mm-diameter aluminum SEM sample stub with double-sided adhesive tape attached (Scotch pressure sensitive tape). Sampling of the hands and face in the outdoor firing tests in Chapter 26 employed acrilan fiber damped with isopropanol (IPA) as per the suspect sampling kit detailed in reference 190. 

One face of the tape is expected to be less soluble than the other (i.e., black is more hydrophobic if the solvent is water in Figure lc). This difference results in intertape attraction and hence in double-tape (ribbon, Figure Id)... 

Once embryos are sitting on double-sided sticky tape, position embryos such that their ventral side is facing up. 

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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