Abstract: A convective warmer for flexible plastic bags containing foam precursor chemicals includes an outer housing and an inner enclosure supported within the housing, the inner enclosure having foraminous floor and ceiling plates and foraminous dividers which divide the inner enclosure into vertical compartments for containing vertical stacks of bags. An air space exists between the housing and the inner enclosure, and a forced-air heater is arranged to heat air within the air space and circulate the heated air from the air space, through the foraminous floor plate into the compartments, and out the foraminous ceiling plate back into the air space. A loading door provides access to upper portions of the compartments for loading bags into the warmer, and a dispensing door provides access to lower portions of the compartments for removing a bottommost bag from a stack of bags in the warmer.

Abstract: A conductive warmer for flexible plastic bags containing foam precursor chemicals includes a heat-conducting member of thermally conductive material having a plurality of fins which are parallel and spaced apart to define a plurality of spaced-apart bag-receiving compartments. The fins are connected to a back portion of the heat-conducting member, to which a heating element is attached in heat-exchanging relationship. Operation of the heating element conducts heat through the back portion and the fins of the heat-conducting member to the bags. The heat-conducting member is contained within a housing having an opening providing access to the open side of the compartments. The housing preferably is formed in two portions, a first portion containing the heat-conducting member and a second portion supporting the first portion, the first and second portions being pivotally interconnected to allow selective variation of the angular orientation of the first portion with respect to the second portion.

Abstract: A dispenser for mixing foam precursor chemicals and dispensing the foamable mixture includes a first module containing shutoff valves and a second module containing a dispensing valve assembly. The dispensing valve assembly includes a valve body of a self-lubricating material and a valving rod which is reciprocatingly retracted in a valve passage of the valve body to uncover orifices which supply the precursor fluids into the valve passage, from which the mixed chemicals are dispensed. The dispensing valve assembly includes a die spring which urges a washer to compress the valve body along its axis to help prevent cold flow of the valve body away from the valving rod. The valving rod is scraped by inner surfaces of the hole in the washer through which the valving rod is retracted and extended. The die spring is preloaded and retained by a load cylinder which is fixed in the bore in the second housing which contains the dispensing valve.