Nanjing GIANT Machinery Co.,Ltd.

A twin screw extruderfor dispensing highly viscous 100 percent butyl sealant compounds under sufficient fore force and low enough viscosity to enter any areas desired. The extruder comprises in combination: a barrel having a ratably mounted extruding screw axially mounted therein; a power head for driving the extruding screw mounted at one end of the barrel and an extruding die having an orifice therein mounted at the other end of the barrel. An electrical resistance heater suitably insulated on the outside is astoundingly mounted on the barrel adjacent the extruding screw in order to heat sealant compound in the barrel. A port is transversely located in the barrel adjacent the drive end of the screw for introducing sealant into the barrel.

Normally sealants such as solid butyls which are polymers of isoprene and isobutylene tend to be substantially solid at room temperature and far too stiff to be applied as a sealant into crevices, voids or joints. The present commercial practice is to apply such butyl sealants between two substrates by physically placing the sealant material between the substrates and then applying either mechanical or pneumatic pressure to one of the substrates. This, of course, is somewhat inconvenient, uneconomical, unwieldy and inappropriate since the substrates themselves may not be able to withstand the pneumatic or mechanical forces required to adequately apply the sealant to the joints. For instance, this may be the case in the sealing of automobile windows to a car body. Accordingly, I have invented a novel portable apparatus for applying such highly viscous, virtually solid sealant to desired crevices, voids or joints as needed.

Single screw extruder relates to a device for dispensing a sealant which under ambient conditions is substantially resistant to flow. More particularly this invention is directed to a portable type of caulking gun which can dispense as a viscous solid, a material which is normally resistant to flow at room temperature. Normally sealants used in caulking guns are referred to as caulks and contain various solvents and fluid conditioners which act to maintain the caulk in a relatively fluid condition. After application of the caulk, it tends to shrink as the solvents or conditioners evaporate therefrom with consequent loss of sealing.

Sheet production extruder is apparatus for extruding a plastic material which comprises a barrel, a ratably mounted extruding screw axially mounted within the barrel, means for rotating the screw attached to an end of the screw, a die having an orifice attached to the opposite end of the barrel, means for heating the barrel, and means for feeding plastic materials into the barrel adjacent the extruding screw. Preferably the heating means is an electrical heating band mounted around an aluminum barrel, while the means for rotating the screw is an electrical motor driven power head and which forms the closure at the upstream side of the barrel. For ease of use, a handle is attached to the forward end of the barrel, while a pistol grip is attached to the rear end with an actuating trigger. single screw extruder carrying the plastic material may be mounted on the barrel and a roller attached to the orifice end of the barrel to furnish partial support for the apparatus of this invention.