Abstract: An apparatus for removing undesirable particles, such as metal and fiberglass, and harmful chemical forms, such as acid etchants, from a fluid solution having container means at least partially formed from a plastic electret material disposed in contacting relationship with the solution and carrying an electrostatic charge which causes the particles in the solution to adhere to the surface of the container formed from the material. The container means include a receiving tank having baffles spaced therealong, a filter assembly having filter cartridges to remove foreign matter from the solution and a holding tank, each of the tanks and the shell of the filter being formed from the plastic electret material. The holding tank includes a metal chip assembly placed in contact with the solution and chemically reactive with etchants in the solution to neutralize them.

Abstract: The present disclosure pertains to a novel score-line construction for easy-opening pull tab type cans, as well as a method for forming said score-line. In this regard, the score-line is disposed closely adjacent to the rim of the container end portion, and includes a substantially perpendicular outer peripheral wall. This arrangement provides, upon formation, a zone of compacted material immediately below the base wall surface of said score-line, which zone has an outer peripheral edge that terminates abruptly and substantially in alignment with the aforementioned perpendicular outer wall surface. Accordingly, upon opening, the path of fracture will follow said outer peripheral wall and be substantially coextensive with the edge of said zone, precluding erratic fracturing of said score-line and the formation of relatively sharp burrs.