A method of forming a headrest assembly includes providing a first mold that encloses a first cavity in a closed condition. A support is positioned in the first cavity. A first material is blow molded into the first cavity and around a portion of the support to form a core part. The core part and support are removed from the first mold. A second mold encloses a second cavity in a closed condition. The core part and the support are placed into the second mold in an open condition. A fluid is injected into the core part through the support. The second mold is converted to the closed condition. A second material is injection molded into the second cavity and around the core part to form an outer shell around the core part. A fluid is withdrawn from the core part through the support.

An extrusion blow molding method includes detecting an exit velocity of a tube exiting a head during a blow molding cycle for forming the tube. A melt accumulator receives part of the melt conveyed by an extruder or discharges melt in addition to the melt conveyed by the extruder in dependence on the detected exit velocity. The melt accumulator discharges melt if the detected exit velocity is less than a target value for the exit velocity and receives melt if the detected exit velocity is greater than the target value for the exit velocity.

A resin panel includes a first structure and a second structure stacked on each other. The structures includes reference surfaces that serve as the front surface and the back surface of the resin panel respectively. Each of the structures includes a plurality of protrusions protruding inwardly from the reference surface. The protrusions of the structure face the protrusions of the other structure each other. Jutting portions of linear shape are formed between adjacent protrusions of each of the structures. The structures are joined such that apical portions of the protrusions of each structure abut one another.

A vehicle running board includes opposing vertical walls extending along a length of a tubular structure and including a carbon-fiber component. Opposing horizontal walls extend between the opposing vertical walls and include a glass component. The opposing vertical and opposing horizontal walls form the tubular structure having a generally rectilinear cross section. A polymer outer covering extends over the opposing vertical and opposing horizontal walls.

The invention relates to a method for the production of a bladder accumulator (10) which separates two media chambers (16, 18) from one another in a storage housing (12) by means of a bladder body (14), comprising at least the following production steps:extruding a plastic tube over the bladder body (14);shaping the plastic tube with the integrated bladder body (14) in a molding tool that corresponds to a predeterminable plastic core container (20), andwinding at least one plastic fiber from the outside on the plastic core container (20) for the purpose of creating the storage housing (12).

A vehicle running board includes opposing vertical walls extending along a length of a tubular structure and including a carbon-fiber component. Opposing horizontal walls extend between the opposing vertical walls and include a glass component. The opposing vertical and opposing horizontal walls form the tubular structure having a generally rectilinear cross section. A polymer outer covering extends over the opposing vertical and opposing horizontal walls.

Provided is a method for extruding molten resin in a charging space from a head by converting a rotational motion of an electric motor into a linear motion of a piston disposed in the charging space through a ball screw and thus causing the piston to move vertically, the charging space being a space into which the molten resin can be charged and formed in an accumulator, the head having an extrusion port at a lower end thereof. The method includes a step of separating an upper plate from a lower plate and retracting the upper plate upward by a rotational motion of the electric motor and then charging the molten resin into the charging space with a sufficient charging pressure to push up the piston against weights of the lower plate and the piston in the charging space, the lower plate being disposed over the accumulator and coupled to the piston from above, the upper plate being engaged with the electric motor through a screwing relationship and disposed over the lower plate so as to be able to surface-contact the lower plate and a step of extruding the molten resin from the extrusion port by moving the upper plate downward with the upper plate and the lower plate surface-contacting each other by a rotational motion of the electric motor and thus moving the piston downward in the charging space.

A resin panel of which contact surfaces of a rear wall to be in contact with another member are made unlikely to deform while reducing the weight of the resin panel. The panel includes a rear wall having a plurality of contact surfaces to be in contact with another member, and a front wall opposing the rear wall with an interval therebetween, the resin panel including a plurality of ribs obtained by indenting parts of the rear wall toward the front wall and welding the parts to an inner surface of the front wall, wherein a wall thickness of the front wall is generally equal to or smaller than a wall thickness of the rear wall.

An example extrusion blow molding (EBM) method includes extruding first and second colors of plastic to form a parison that includes an inner layer of the first color of plastic, and an outer layer of the second color of plastic. The parison is placed in a mold, the mold is closed, and the parison is inflated to create a blow molded structure. A portion of an interior of the blow molded structure is formed of the first color of plastic, and a portion of an exterior of the blow molded structure is formed of a blend of the first color of plastic and the second color of plastic.

A resin panel of which contact surfaces of a rear wall to be in contact with another member are made unlikely to deform while reducing the weight of the resin panel. The panel includes a rear wall having a plurality of contact surfaces to be in contact with another member, and a front wall opposing the rear wall with an interval therebetween, the resin panel including a plurality of ribs obtained by indenting parts of the rear wall toward the front wall and welding the parts to an inner surface of the front wall, wherein a wall thickness of the front wall is generally equal to or smaller than a wall thickness of the rear wall.