Lap seal

While a lap seal is technically possible, the bond is too weak to be considered commercial. 

These today are usually used for added protection as a secondary pack. In many respects they are similar to single reel sachet packs, but the product forms the outline of the pillow pack which is usually heat fin sealed up one edge and heat lap 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). 

Figure 9.1 Pillow pouches and fin and lap seals (adapted with permission from [2])...

Find an example of a pillow pouch. Describe it. Does it have a fin or lap seal Why do you think that type of seal was chosen for that application ... 

Imperfection f When required examination is Girth and miter-joint hutt welds Longitudinal hutt welds Fillet, socket, seal, and reinforcement attachment welds Welded branch connections and fabricated laps... 

Pins float in the nozzle segments, allowing them to be lapped flat as a set, providing equal sealing of each segment. 

A complete seal has two basic units the seal head unit and the seal seat. The seal head unit consists of the housing, the end-face member, and the spring assembly. The seal seat is the mating member that completes the precision-lapped face combination that provides the seal. 

Labyrinth piston, 49 Labyrinth seal leakage, 532 Lantern ring, 74 Lapping block set, 335 Lateral critical speeds, 384 Leakage, seal, 532, 533, 534 Leland-Mueller rule, 26 Lift coefficient, 226 Liquid... 

Tape may be made by a similar process. In this case the lubricant selected is a non-volatile oil. The preform is placed in the extruder and a rod extruded. The rod is then passed between a pair of calender rolls at about 60-80°C. The unsintered tape is often used for lapping wire and for making lapped tube. Sintering is carried out after fabrication. The current most important application of unsintered tape is in pipe-thread sealing. 

Laps and crevices should be avoided if possible. If they cannot, then effective seals should be used (particularly in areas of heat transfer) between metal and a porous material or where aqueous environments contain inorganic chemicals or dissolved oxygen. 

The sample eapsule is plaeed in a tight-fitting 4340 steel fixture that serves to support the eopper eapsule. Pressure from the detonation of the explosive is transmitted to the eopper eapsule through a mild steel driver plate. This plate is also lapped optically flat on both surfaces. The mild steel acts to shape the pressure pulse due to the 13 GPa structural phase transition. With proper choice of the diameter of the driver plate and beveled interior opening of the steel fixture, shock deformation of the driver plate acts to seal the capsule within the fixture. 

Pitched roofs. Pitched roofs are typically sloped at a minimum of 6° to ensure the weather resistance of lapped sheeting without sophisticated seals or a waterproof membrane. Portal frames are also more liable to snap through buckling at very shallow pitches. A pitched roof means a greater dead volume to heat, although there is additional space for high-level service distribution. 

The poppet fits into the center bore of the seat. Figure 40.23. The seating surfaces of the poppet and the seat are lapped or closely machined so that the center bore will be sealed when the poppet is seated (shut). The action of the poppet is similar to that of the valves in an... 

The benefit of such a LAPS sandwich structure consists in a easy manufacturing process, where no patterning and masking as well as encapsulation of conducting tracks are needed (see Fig. 5.1). In the measurement set-up, the LAPS structure itself will be embedded in a measurement chamber. The flat uniform surface of the LAPS assists a proper sealing by, e.g., an O-ring, silicone or rubber material. Finally, only the sensitive membrane will stay directly in contact with the analyte under test. 

In another report, adherent CHO-K1 cells, which expressed the ml-muscar-inic acetylcholine receptors, were studied as a response to stimulation by the agonist, carbachol. The cells were first grown on a coverslip, then sealed to a LAPS chip with eight fluidic channels for measurement (see Figure 8.16) [848,849]. 

Sheet or panel (metal, plastic, etc.) wall siding. Seal tight all lap or butt joints. Make certain that caps, covers and flashings don t have hidden voids due to siding configurations (flutes, corrugations, etc.)... 

I had tucked the envelope of money into my bodice but held the parchment, folded in thirds and sealed with red wax, in my lap. My father had addressed it in his tremulous hand For my daughter, Emilie. I thought everybody in the carriage must be struck by its significance, but they took no notice. After we had driven well beyond London, I slid my finger under the flap and broke the seal. The paper was somewhat bent where it had been in Aislabie s pocket but otherwise undamaged. 

Due to leakage past the plug-to-cage seal. Class VI shutoff cannot be achieved with a balanced valve. Various versions of unbalanced valves provide Class IV, V and VI shutoff (Part d of the figure). No special lapping is required, except perhaps to correct nicks or misalignment that occur during manufacture or maintenance. 

Figure 6.2 Joint types (a) butt joint (b) expansion joint (c) (i) glass-to-glass lap joint, (ii) concrete-to-concrete lap joint (d) triangular joint (e.g. sanitary seals and glazing seals). H = sealant S = backing material [part (c)]...

The cured sealant gives a tough, elastic, rubber-like seal and gives excellent adhesion to concrete and masonry, glass, aluminium and stainless steel. The shore A hardness ranges from 15-35. The movement accommodation factor is 25% in butt joints and 50% in lap joints. These sealants have the capacity to accommodate continuous and pronounced cyclic movements. They are suitable for joints where the joint width may range between 5 mm and 50 mm. Joints which are expected to experience cyclic movements should have a width depth ratio of 2 1. Minimum sealant depths recommended for different environments are mentioned in Table 7.8. Primers... 

Failure to do this will eventually lead to failure. Some membrane systems of differing types that may be lapped and the lap pressure-sealed are occasionally used in a compromise design. (See the manhole outlet designs in Chapter 46, and the details in Drawing 13.) The detail in Sketch 2 is not as safe and foolproof as that in Sketch 1, but in exposures that are not subject to a continuous liquid head, it may have an economical life expectancy. 

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