Tape-and-reel

A wide variety of fully automatic machines exist. Generally, feeders, which may consist of tape-and-reel, stick, or tray, deliver the parts individually so they can be picked up and automatically inspected. Machines are equipped with vacuum nozzles to pick up the components and carry them through inspection, alignment, and placement. A list and description of commercially available component placement equipment is given in Table 4.24. 

Component Packaging Formats. Odd-form components come in a variety of sizes, geometries, and I/O configurations that determine the ease with which the component can be automated into the assembly process line. Another important variable is the component placement machine. Typical component packaging formats for the placement machine include tape and reel (radial and axial leaded), extruded tube, tray, continuous strip, and bulk containers. Each of these formats has benefits and drawbacks, as noted in the following subsections. Industry specifications have standardized nearly all of these packaging schemes. For example, there is EIA-468-B for radial deviees and EIA-296-E for axial components. 

Feeder Types All-Tape and reel, tray. Tape and reel I... 

Figure 7.27 Slip-casting process showing the addition of a drying zone, to remove the slip liquid, cutting or slitting and tape-takeup reels.

Of all the backup media that are available, the most popular is magnetic tape (including reel-to-reel, DAT, DLT, and any backup system that uses a magnetic tape in a cartridge). There are a few reasons it is the most popular ... 

The thickness of the deposited layer is determined by the height of the doctor blade above the polymer sheet. Multilayer films are possible using the approach illustrated in Figure 27.2. The special feature of the doctor blade is that it produces a very uniform thickness. A typical doctor blade assembly is shown in Figure 27.3. The cast tape is dried, peeled from the polymer sheet, and reeled up to wait for further processing. At this stage of the process the tape is flexible because it still contains a... 

Industrial Batteries, business machines, transmitter caps, instrument covers, and tape and data reels... 

For bonding thermoplastic parts made from the same material, the matrix is generally the same material as in the part and can be matched on melt flow. For dissimilar materials, a blend of the two thermoplastics is used. Type and cross-section of the EMA material (ferromagnetic filler -i- thermoplastic matrix) are dependent on the size and shape of the parts to be welded and on the position of the work coils. EMA material is supplied in many different forms (Fig. 14.33) strands and extruded profiles (continuous reels and precut), tapes and strips up to 30 cm wide, stampings and in-j ection-molded parts. 

A step motor and tape reels to accomplish filter tape feed... 

The interface gauging probe incorporates a measuring tape on a reel, connected to an electronic sensor head. The sensor head contains a float-ball and magnetic relay switch assembly that distinguishes between air and fluids also contained in... 

Sol-gel processes are also suitable for lanthanide oxide formation, as could be shown by the use of Tb(acac)3 and Dy(OBu- )3 in acetylacetone" . Tb203 crack- and pine-hole-free, dense and smooth microstructured buffer layers were produced on nickel tapes by a reel-to-reel continuous sol-gel process. The authors report that the film properties can be strongly influenced by solution components, temperature, time and atmosphere. Nanocrystalline mesoporous dysprosium oxide Dy203 with narrow monomodal pore size distribution can be approached by a combined sol-gel process with a surfactant-assisted templating technique . The spherical Dy203 nanoparticles were formed with aggregations. 

To obtain a constant tape speed, a motor is used to turn a small metal cylinder, called a capstan, at constant speed. When the tape player is switched on, a roller presses the tape against the rotating capstan. The tape is pinched between the roller and capstan, forcing it to move toward the take-up reel at constant speed, as desired. 

Filter-Paper Tape. A technique that inherently conserves the sample uses a filter-paper roll. The sample would be deposited at a collecting station and then advanced to a measuring station. Ultimately, it wouM be wound onto a takeup reel and saved for further investigation. 

Fig. 6 Schematic of a tape casting process used to form thin sheets of ceramic material. The slurry of ceramic particles and carrier fluid flows beneath the doctor blade onto a moving carrier film. As the tape moves down the bed, it dries and is then spooled on a take up reel.

At that time this was a formidable calculation. It was performed on an IBM 370/158, which was not a supercomputer, but nevertheless a respectable mainframe. A basis of 144 Gaussian type orbitals (GTOs) was used for restart purposes integrals were stored on tape, requiring two tapes of 170 Mb for one point on the PES. About 150 points were computed, so that 300 tapes were needed. A tape reel had a diameter of 10.5 in. and, including its case, was about 1 in. wide, so that a rack of about 7.5 m long and 30 X 30 cm wide had to be used to store the 50 Gb of information. One point on the surface took... 

In tape-automated bonding (TAB), the semiconductor die, fabricated with bumped interconnect pads, are positioned in apertures of a polymer-film tape, generally polyimide (Kapton , a registered trademark of DuPont), then gang-bonded to cantilevered beams that are formed by photodelineated metal pads on the tape. The tape (film) has sprocket holes along its sides similar to movie film and, like movie film, is handled on reels in automatic equipment for high-speed assembly. ... 

Often the problem with reels is that they re edited to look like TV shows. So you think, well, that s the subject, and it could be turned into a TV show, but you don t know how good the film is going to be. In other words, they shouldn t be too slick—or, they should be slick, but [you want] to edit them so that they look like the final film. Tapes can be much rawer, but something attractive on them tells you what the impact of the final film would be. 

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