Abstract: A plurality of fluid treatment devices are disclosed to treat a recirculating fluid of a closed loop heat exchange system. A fluid treatment device may include a sacrificial metallic substance. A fluid treatment device may include a filtering member. A fluid treatment device may include an electronic treatment device.

Abstract: A curable hot melt adhesive is used as a primer on a book block. A conventional thermoplastic hot melt is then applied on top of the reactive hot melt before the cover material is positioned.

Abstract: It has been found, in accordance with the present invention, that a high molecular weight polyester, when reacted with a poly or diisocyanate in an NCO:OH ratio of 0.7:1 to 1:0.7, produces a high molecular weight hydroxy terminated prepolymer which is stirrable above 120° C. and sufficiently stable prior to reaction with additional di or polyisocyanate or optional additional polyols to produce a reactive hot melt adhesive.

Abstract: A catalyzed polyurethane reactive hot melt adhesive is prepared from a reactive polyurethane prepolymer and 0.05 to 0.6% by weight of a 2,2'dimorpholinoethyl ether or di(2,6-dimethylmorpholinoethyl)ether catalyst. The adhesive is characterized by improved curing speed with little or no effect on the thermal stability.

Abstract: Stirrable reactive polyurethane adhesive compositions are packaged in a single container by separating the reactive components with a disperable barrier layer so as to delay reaction until the entire adhesive composition is stirred together.

Abstract: Bell and plain or beveled end pipe sections are joined together in sealing engagement by placing a gasket between the sections and in radial compression. Pipe whose cross sections may deviate from a true circle and whose diameters may range over a wide tolerance are joined together utilizing an economical gasket, without requiring extremely high assembly forces. A specific portion of the gasket is compressed by a novel compression rib which allows assembly of the system without excessive end force and yet maintains radial compression of the gasket over a wide range of tolerances.

Abstract: A drive for a guide bar on a Raschel knitting machine to permit shogging across the full width of narrow fabrics. The drive is by cam, double lever linkage with adjustment slots and pins at at least two points on the levers. For maximum fabric width, for example significantly wider than 1.25 inches, there is also a minor modification of the guide bar supports themselves. These involve pins, and the pins are enough longer so that the bar can move a greater distance without interfering or striking other portions of the knitting machine.