Fin seal

Pillow Pack. Today these are usually used for added protection as a secondary pack. In many respects they are similar to single-roll sachet packs, but the product forms the outline of the pillow pack, which is usually a heat fin—sealed up one edge and heat sealed/guillotined on each end. 

Polymer films are heat-sealed to form either lap or fin seams resisting shear and delamination loads, respectively. The fin seal is less strong than the lap seal [34]. It is recommended to seal PE-coated inhibited paper bags with a lap seam and strap the butt with the same material [3] (Fig. 2.54). 

Lead or Fluorocarbon Backup Strip Seal Sleeve With Fins... 

Figure 10-148. Shell-side friction factors for bundles with 20%-cut segmental baffles, one seal strip per 10 rows of tubes, and TEMA clearances. These factors can be used for plain or low-finned tubes with the appropriate values of D s or d s. (Source Engineering Data Book, 1960. Wolverine Tube, Inc. Used by permission Kern, D. Q., and Kraus, A. D. External Surface Heat Transfer, p. 511, 1972. McGraw-Hill Book Co., Inc. All rights reserved.)...

Figure 10-148 presents a recommended pressure drop correlation for low-fin tubes in shells and is based on clean tube pressure drop with no dirt sealing the leakage clearances between tubes and baffle holes or baffle-to-shell clearances. A fouled condition pressure drop may be an indeterminate amount greater. The authors state that this University of Delaware correlation has some lactors built in that limit the deviations to a relatively small range. Figure 10-148 has... 

We use variants of profile extrusion to produce tubing -with diameters of less then 1 mm and pipes with diameters exceeding 1 m, Wall thicknesses can vary from a few tens of micrometers up to several centimeters. Extruded window and door frames are more complex than pipes. Such profiles are largely hollow with internal ribs and fins that reinforce and divide the interior into two or more channels. We use solid rubber profiles in applications such as door seals and windshield wipers. We can produce foamed extrudates by incorporating a blowing agent, such as butane or carbon dioxide, into the polymer in the molten state. As the polymer exits the die, its internal pressure drops and the dissolved gas expands to form bubbles within the product. Examples of foamed extrudates include pipe insulation and automobile door gaskets. 

Following an incident in which a drum containing bulked drainings (from other drums awaiting reconditioning) finned and later exploded after sealing, it was found that methyl methacrylate and propionaldehyde can, under certain conditions of mixing, lead to a rapid exothermic reaction. Precautions are discussed. 

Bearing Frame. Frames shall be equipped with axial radiating fins extending the length of the frame to aid in heat dissipation. Frame shall be provided with ductile iron outboard bearing housing. Both ends of the frame shall be provided with lip-type oil seals and labyrinth-type deflectors of metallic reinforced synthetic rubber to prevent the entrance of contaminants. 

The red end must be assembled adjacent to the primer (Ref 42, p 86). Ignition cartridge is inserted into fin assembly ahead of the primer. The shaft, in turn, is screwed into the base of projectile, which is made either from pearlitic malleable iron or from steel. Propellant M9 [ See Vol 2, p C35, Table VI (Ref 44)] charge consists of several increments sealed in individual cellophane bags (usually four for 60-min mortars and up to nine for 81-mm weapons). The bags are placed either between or within the blades of fins. 

All bombs, except the very largest, are packed in wooden boxes or crates. The fin assemblies for the larger bombs are also crated when packed separately from the bombs. Some bombs are packed with fuzes inserted but with primer-detonators removed. However, rhe fuzes are usually removed and packed in sealed moisture-proof containers. In the latter case the fuze wells in the bombs must be closed with plugs. Some fuzes are packed in the same containers with the bombs, others separately. Bombs and components are stored as shipped. Complete rounds should not be assembled in advance of requirements and assembled rounds should be carried with sealing wires and safety in place at all times until installation in the plane. The arming wire should remain in place until the bomb is released, or until the safety pins and sealing wire are replaced and secured... 

Fig. 6.4. Cross-section of a metal diffusion pump. The upper stage in this pump has a wide annular opening (A) which provides a good ultimate vacuum. The lower stage has a small annular opening (A ) so the pump will operate against a high fore pressure. (B) High-vacuum connection to the low-temperature trap and vacuum line. (C) Connection to rotary oil-sealed pump. This pump is cooled by means of water tubes (D). Air-cooled versions have fins in place of these tubes and a fan is installed to blow air over these fins. (E) Electrically heated oil reservoir.

Applying fins coated with titania is an effective way to enhance the formaldehyde removal performance (Mo et al., 2008b). In order to compare the formaldehyde removal performance of annular photocatalytic reactors with and without the aforementioned fins, the PCO reactors without and with the fins operated in a sealed stainless steel chamber with formaldehyde in its air, respectively. Figure 4.15 shows the chamber formaldehyde concentration decay curves (a) an annular PCO reactor without fins, (b) an annular PCO reactor with six fins. It can be seen that the reactor with fins is more efficient than that without. The reason and the analysis are presented by Mo et al. (2008b) in detail. 

Plate-fin heat exchangers are manufactured by assembling plates separated by corrugated sheets, which form the fins. The plates are made from aluminum sealed by brazing. The operation of these devices requires clean fluids. The main applications can be found in cryogenic and natural-gas liquefaction for pressures and temperatures up to 60 bars and 150°C. 

Trinitrobenzene can be prepared by heating m-dinitro-benzene with nitric acid and sulfuric acid to 1200 1 by heating 2, 4, 6-trinitrotoluene with finning nitric acid in a sealed tube at 1800 for three hours 2 by heating 2, 4, 6-trinitrobenzoic acid or its sodium salt with water, alcohol, dilute sodium carbonate or other suitable solvent.3... 

Trinitrobenzoic acid has been prepared by heating trinitrotoluene with finning acid in a sealed tube to ioo°, for two weeks,1 the oxidation being only partial. It can also be prepared by heating trinitrotoluene under a reflux condenser, with a mixture of 5 parts of concentrated nitric acid and 10 Ber. 8, 123 (1870). 

The aquatic mammals of the coasts are carnivores that belong to the suborder Pinnipedia. Members of this suborder, commonly referred to as the pinnipeds, or fin-footed animals, use flippers for locomotion on land and in the water. Their sizes range tremendously, from relatively small animals that weigh a mere 200 pounds (90.7 kg) to organisms that are as heavy as several tons. Pinnipedia can be divided into three main families Phociadae (true seals), Otariidae (eared seals, which includes sea lions and fur seals), and Odobenidae (walruses). 

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