A blow molding assembly includes a die, a mandrel, and a die holder. The die defines an inner wall. The mandrel is disposed at least partially inside the inner wall of the die and defines, with the inner wall of the die, an annular gap that shapes a molten resin passed therethrough, forming a parison. The die holder includes a body and three or more spring-loaded fasteners positioned around an inner perimeter of the body. The spring-loaded fasteners apply pressure to respective positions on an outer surface of the die while permitting movement of the die within a plane that is substantially orthogonal to a longitudinal axis of the mandrel in response to pressure variations of the molten resin, keeping a thickness of the parison substantially even. Each of the spring-loaded fasteners includes a spring-loaded plunger engaging the respective position on the outer surface of the die.

The invention provides an appartus for adjusting the thickness of a resin film exiting an extrusion lip of a blown film extruder, the apparatus comprising: a gear motor configured to provide a rotational movement in any one of two directions; an actuation unit connected with a first side to the gear motor and with a second side to the extrusion lip, wherein the actuation unit is configured to convert the rotational movement of the gear motor into an axial movement, and wherein the actuation unit is further configured to adjust a local width of the extrusion lip by the axial movement for adjusting the thickness of the resin film exiting the extrusion lip of the blown film extruder.

The invention provides an appartus for adjusting the thickness of a resin film exiting an extrusion lip of a blown film extruder, the apparatus comprising: a gear motor configured to provide a rotational movement in any one of two directions; an actuation unit connected with a first side to the gear motor and with a second side to the extrusion lip, wherein the actuation unit is configured to convert the rotational movement of the gear motor into an axial movement, and wherein the actuation unit is further configured to adjust a local width of the extrusion lip by the axial movement for adjusting the thickness of the resin film exiting the extrusion lip of the blown film extruder.

Disclosed apparatus and method to extrude a honeycomb, providing correction in bowing of the extruded honeycomb structure, employs a deflector device having a base plate including an opening aligned in a direction parallel to the extrusion axis through which the plastic material is conveyed to the die. The deflector device includes a bow plate movably mounted to the downstream or upstream side of the base plate. The bow plate includes a constant area aperture. The deflector device positioned upstream of extrusion die imparts a degree of bow reduction by the position of the constant area aperture over the opening imparting a pressure drop gradient on the flow stream entering the die.

Provided is a blow-molding method capable of suppressing generation of blister-like bubbles and producing a high quality hollow molded article when forming a thick hollow molded article by blow-molding. A blow-molding method includes setting a die-slit interval in a die head according to a target wall thickness of a hollow molded article to be molded, extruding a molten resin in an accumulator into a cylindrical shape from the die slit to form a parison, and molding the parison in a mold. The die-slit interval is made smaller than a value set according to the target wall thickness at start of extrusion, and then is increased to match the value set according to the target wall thickness. The value set according to the target wall thickness is preferably corrected considering wall thickness reduction due to drawdown. The wall thickness of the hollow molded article is preferably 3.5 mm or more.

A flexible die head for continuously extruding pipe may have a flexible ring mandrel (112). A second, open end (120) of the ring mandrel (112) near the die exit may be continuously and resiliently formed to a non-circular shape whilst extruding the pipe so as to provide an extrudate profile to counter slump in plastic pipe forming. Symmetric and asymmetric shapes may be formed by the ring mandrel (112). The second end (120) may be flexed or otherwise distorted by use of a flexing means (122). The ring mandrel (112) may also be necked in a circumferential portion to order to further improve the forming of non-circular shapes.

A head is disclosed for use with a continuous manufacturing system. The head may have a housing configured to receive a matrix and a continuous fiber, and a diverter located at an end of the housing. The diverter may be configured to divert radially outward a matrix-coated fiber. The head may also include a cutoff having an edge configured to press the matrix-coated fiber against the diverter.

An apparatus and method for modifying an aspect of an exterior polymer material or polymer type material of a linear substrate with a fluid. The apparatus include a variable exposure gap within which the linear substrate is exposed to the fluid. The width of the exposure gap is varied with the speed of the linear substrate traversing the exposure gap to maintain a constant exposure time of the linear substrate with the modifying fluid.

An annular nozzle contains a nozzle body, the nozzle body comprising at least one annular gap for the discharge of a film. The annular gap is laterally bounded by a stationary wall and a flexible lip. A plurality of threaded pins and a corresponding number of bolts are arranged in the nozzle body. Each of the threaded pins is rotatably mounted in a first bore in the nozzle body. Each of the bolts is slidably mounted in the nozzle body in a second bore in the nozzle body. The bolt is in contact with the flexible lip and the corresponding threaded pin so that a compressive force can be transferred from the threaded pin to the bolt and via the bolt to the flexible lip.

An annular nozzle contains a nozzle body, the nozzle body comprising at least one annular gap for the discharge of a film. The annular gap is laterally bounded by a stationary wall and a flexible lip. A plurality of threaded pins and a corresponding number of bolts are arranged in the nozzle body. Each of the threaded pins is rotatably mounted in a first bore in the nozzle body. Each of the bolts is slidably mounted in the nozzle body in a second bore in the nozzle body. The bolt is in contact with the flexible lip and the corresponding threaded pin so that a compressive force can be transferred from the threaded pin to the bolt and via the bolt to the flexible lip.