Abstract: A method of producing a brush for the cleaning of electronic components. In this method, a plastic core is prepared and submerged into a solvent to melt the outer surface of the core. While the outer surface of the plastic core is still partially melted, it is rolled through a trough of powdered polyvinyl alcohol (PVA) such that granules of PVA melt into and subsequently become embedded at the outer surface. As the solvent evaporates, the outer surface of the core re-hardens and the granules of PVA become firmly entrapped at the outer surface. The PVA covered shaft is placed in a mold, which is then filled with a PVA solution. As the solution cures, it forms a strong bond with the PVA granules that are embedded at the surface of the plastic core. Thereafter, the mold components are disassembled, leaving behind the finished cored brush.

Abstract: A method of producing a brush for the cleaning of electronic components. In this method, a plastic core is prepared and submerged into a solvent to melt the outer surface of the core. While the outer surface of the plastic core is still partially melted, it is rolled through a trough of powdered polyvinyl alcohol (PVA) such that granules of PVA melt into and subsequently become embedded at the outer surface. As the solvent evaporates, the outer surface of the core re-hardens and the granules of PVA become firmly entrapped at the outer surface. The PVA covered shaft is placed in a mold, which is then filled with a PVA solution. As the solution cures, it forms a strong bond with the PVA granules that are embedded at the surface of the plastic core. Thereafter, the mold components are disassembled, leaving behind the finished cored brush.

Abstract: An improved trickle irrigation unit includes a selector dial for controlling water flow through a plurality of outlet ports. The trickle unit comprises a valve housing having a water inlet port opening into one side of a pressure chamber, the other side of which is defined by a plurality of recessed flow patterns each leading to a respective one of the outlet ports. A resilient valve flap within the pressure chamber is hydraulically seated over the flow pattern and includes an array of flow passages alignable with selected flow patterns to permit water flow thereinto from the pressure chamber, with the flap deforming into the selected flow patterns for pressure-responsive flow control of water to the associated outlet ports. The valve flap is rotatably carried by the selector dial for movement to different set positions to alter the number of flow patterns aligned with flap flow passages thereby correspondingly altering the number of outlet ports in flow communication with the pressure chamber.