Abstract:
Novel fibers have been made of reactor grade isotactic poly-alpha-olefin wherein polypropylene is produced by single-site catalysis and has a melt flow rate of greater than zero to about 5,000, MWD in the range of about 1.0 to about 3.5.
Abstract:
This invention relates to improved polypropylene nonwoven fabrics. The fabrics are made from isotactic polypropylene which has been produced with a catalyst systems comprising at least two metallocenes. These nonwoven fabrics, particularly when prepared using a spunbonding process, exhibit significantly improved strength without significant sacrifice of other favorable properties.
Abstract:
A cassette grounding apparatus includes a plurality of first contacts provided on a cassette casing for accommodating an object to be grounded in such a manner that the contacts are exposed. Each of the first contacts is electrically connected to the object accommodated in the cassette casing. A second contact which is constituted by a spring member is provided on a cassette holder into which the cassette casing is loaded. The second contact is grounded and adapted to contact one of the first contacts on the cassette casing when it is loaded in the cassette holder, thereby grounding the object accommodated in the cassette casing. A third contact which is constituted by a spring member is further provided on the cassette holder. The third contact is connected to means for detecting a contact condition between the first and second contacts, and adapted to contact the other of the first contacts on the cassette casing when it is loaded in the cassette holder.
Abstract:
A wind-up apparatus for forming laps comprises a first winding roller, a second winding roller, a lap bobbin tube and a plurality of, for instance four, calender rolls. The calender rolls serve for consolidating a fiber layer into a windable fiber web. Each calender roll of the predetermined number of calender rolls has a predetermined rest position and an operating position. A guide structure is provided for the calender rolls to enable the calender rolls to be movable within a given mobility range defined between the rest position and the operating position. The guide structure comprises force-producing elements for moving the calender rolls into the predetermined rest position thereof.
Abstract:
A wind-up apparatus for forming laps comprises a first winding roller, a second winding roller, a lap bobbin tube and a plurality of, for instance four, calender rolls. Each calender roll is movably mounted at each of its opposite ends by means of a spring pair receiving the calender roll. Each spring pair is fixedly connected at one end to a bearing member of the related calender roll and at its other end by means of a carrier to side walls of the wind-up apparatus. A piston of a pneumatic cylinder moves the calender rolls from a rest position, in which there is a spacing D between the calender rolls and a spacing E between the last calender roll and the first winding roller, into a working position in which the calender rolls are pressed against one another in the absence of an intervening fiber layer. The position of the calender rolls in their rest position is maintained by the spring pairs.
Abstract:
In loading a carton with a coil of steel strapping for dispensing through a central circular aperture in the front wall of the carton, the carton is mounted on a mandrel which is received through the dispensing opening in the carton, the mandrel having a cylindrical winding surface disposed within the carton and having one or more radial slots therein. The leading end of a supply of steel strapping is fed through an open end of the carton and inserted into the slot and the mandrel is rotated for winding a coil of steel strapping thereon. The loaded carton is then removed from the mandrel. Retaining means are provided for holding the carton in place in its loading position on the mandrel so as to prevent rotation of the carton and bulging of the front and rear walls thereof during the winding operation.
Abstract:
Wire-mesh webs formed from interengaged flattened spirals, especially chain-link fencing, upon manufacture coiled by twisting the planes of the spirals so that they fit tightly together and almost coincide with axial planes of the roll. During the coiling process, one to three tension elements are introduced into the corresponding troughs of the successive undulations formed by the successive spirals to maintain the latter in their substantially erect condition. The result is a highly compact roll.
Abstract:
A container is disclosed that enables a long length of an edged metal resilient band, paper mill doctor blade stock for example, to be formed as a coil therein and dispensed to permit desired lengths to be cut therefrom. The container, which also serves as a shipping case, has a port through which an end of the band may be introduced and caught by a detachable winding key by which the coil is formed. The coil is within and confined by a circular series of rollers and the outer end of the contained band is held adjacent the exit port between a pair of members rotatable only in a band-dispensing direction. One of the rotatable members is movable into and out of its band-nipping position relative to the other to permit an end of another band to be introduced through the port when the container is to be refilled.