Abstract: An elongated string trimmer line has a filament body with a longitudinal axis and having a non-circular cross-sectional shape, where the filament body contains 80% or more of the total mass of a length of comparable string trimmer line having a circular cross section of a diameter equal to the diameter of a circle circumscribing the cross-sectional shape of the filament body. The trimmer line is rotated about the longitudinal axis of the filament body from about 0.25 to 2.0 rotations per inch.

Abstract: An elongated string trimmer line has a filament body with a longitudinal axis, and a plurality of protruding lobes extend from the filament body along its length. The trimmer line is rotated about the longitudinal axis of the filament body from about 0.25 to 2.0 rotations per inch.

Abstract: A fixed line top-loading trimmer head for string trimmer machines, uses line segments of a predetermined length. The head has a central hub designed for attachment to the drive shaft of a string trimmer machine. A circular flange is attached to, and extends outwardly from, the central hub. This circular flange has one or more trimmer line exit openings on the circumference. The hub, located above the upper surface of the circular flange, is provided with either line termination apertures in the form of holes or channels which are angularly offset from the exit openings in the circular flange; or it is provided with an offset guide channel through which a trimmer line is passed between the exit openings. A line guide channel is located in the flange between the line exit openings and the line termination apertures, or the offset channel on the hub, for guiding line between the exit openings and the offset channel or termination apertures.

Abstract: A head for a string trimmer machine includes a housing member having a central axis. The housing member is adapted for attachment to a string trimmer machine and includes a serpentine guide path in the housing for a length of trimmer line, with the guide path being located in a plane including the central axis of the housing and terminating in exit openings on opposite sides of the housing.

Abstract: Elongated string trimmer line is configured with a cross section throughout its length having a thickness which is less than the width thereof, and which includes top and bottom surfaces at least a portion of which are located in parallel planes. The line may be made by passing a blank of high molecular weight orientable plastic through opposing calendering rollers, which impart bi-axial orientation to the molecular structure of the finished line.

Abstract: A head for a string trimmer machine includes a housing member having a central axis. The housing member is adapted for attachment to a string trimmer machine and includes a serpentine guide path in the housing for a length of trimmer line, with the guide path being located in a plane including the central axis of the housing and terminating in exit openings on opposite sides of the housing.