Abstract: A dermabrasion device having a surface (120) with protuberances (110) arranged in a pattern (160) defined by an abrasive group (130) with at least three protuberances (110), arranged in a first arc; and a second abrasive group (130) arranged in a second arc having a larger radius than the first arc and wherein the second arc is concentric with the first arc, each abrasive group (130) being formed by at least three protuberances (110) with different apex shapes. In addition, the abrasive group (130) has protuberances (110) that have different heights to remove unwanted tissue at different skin depths, preventing the creation of noticeable wrinkles or lines that may later cause scarring.

Abstract: A method of mixing first and second molding components in a non-intermeshing twin screw compounder having a discharge opening wherein the first component is added around a first of the two rotating screws at a point remote from the discharge opening, the second component is added around the first screw nearer the discharge opening, vacuum is applied to the mixing components nearer the discharge opening, rotation of the two screws is stopped, and the second screw is axially moved toward the discharge opening to eject mixed components from the compounder and into a female mold.

Abstract: A compounder feeder for mixing and then injecting materials such as polymers and glass fibers into a female die mold includes first and second parallel screws which have interengaging spur gears and external mixing discs, the mixing discs of one screw not engaging the mixing discs of the second screw, a drive motor for rotating the first screw and a drive cylinder for moving the second screw axially toward and away from the female die mold to inject mixed material directly therein.