Abstract: A container (30d) of polyethylene terephthalate or similar thermoplastic material has a container body (32d), a mouth portion (37d) and a central bottom part (34d). The central bottom part consists of chiefly amorphous and/or thermocrystallized material and forms a bulge directed towards the interior of the container. A ring-shaped or band-shaped standing surface (36d) is arranged adjacent the transition of the bottom part into the container wall (32d). Adjacent to the standing surface the container has a circumferential area of material (35d) which by stretching and/or reshaping has undergone flow and by heating has acquired built-in stresses which tend to contract it. The surrounding circumferential area of material prevents the inward bulge of the central bottom part from straightening out and/or turning inside out when the pressure in the container is increased and/or when the temperature of the container material is raised.

Abstract: Apparatus for producing a container from a tubular blank of polyethylene terephthalate or similar material, according to which a polyethylene terephthalate blank is stretched at least approximately 3-fold to produce a preform (20). In an axial section through the preform, the contour length substantially corresponds to the contour length in an axial section through the final container. The preform (20) is heated to a temperature above the glass transition temperature (TG) and is converted to the container (21) in a blow mold (12). In doing so, the contour length of the material is maintained through successive reduction of the axial length of the body (23) which the preform constitutes during the conversion to the container. In order to achieve this, the base portion of the blow mold (11) is moved towards the orifice (22) of the final container.

Abstract: Apparatus and a process for manufacturing multiple color thin-walled hollow sheels for parts such as automobile door panels, consoles and instrument panels from dry thermoplastic plastisol includes a supply box with a divider to form two or more compartments in the box. The box divider cooperates with selectively positioned split mold parts defining a separation in an open-ended heated mold for separating the mold into two or more sections. Complementary open ends of the charge box and mold are joined. Then the apparatus is rotated so that the powder is distributed into each mold section by gravity flow with the powder from each section flowing to the divider which separates the colors so as to form two or more tones on a resultant shell of cured material; thereafter the powder box is removed and the split mold parts are joined to clamp cast shell segments for fusion at a joint line.

Abstract: This relates to a method of forming a thermal/collapse-resistant highly oriented polyester container for use in hot fill applications. In accordance with the method of a polyester preform is reheated and then placed in a blow mold cavity whereat the preform is distended to match the blow mold cavity to form an intermediate article including a container having an oriented end unit receiving finish of a diameter materially greater than the diameter of the preform. The method is characterized in that in providing the preform the composition of the polyester, the draw ratio during distending of the preform and reheat conditions are all controlled to provide a container with a sidewall and finish density in the range of 1.350 to substantially but less than 1.370 grams/cubic centimeter.

Abstract: The process and apparatus includes a die assembly having a die cavity defined therein and an inlet port in the die assembly communicating with the die cavity. An injection nozzle is provided for delivering molten synthetic resin to the die cavity through the inlet port having an opening aligned with the inlet port and a thermally insulating sleeve positioned around the injection nozzle having an elastically yieldable component and a rigid component.

Abstract: An improved method of forming a decorative panel of molded plastic comprising the steps of constructing a form having a detailed masonry surface; covering the detailed surface with a mold release material; applying a thin layer of gel coat over the mold release; applying a plurality of layers of fiberglass matte and resin over the gel coat layer; allowing the plurality of fiberglass matte and resin layers to harden thereby forming a heat resistant mold having a female side being formed against the detailed surface and a side opposite from the female side; removing the mold from the form; perforating the mold thereby providing fluid communication between the two sides; connecting a vacuum apparatus to the side opposite of the mold; placing a sheet of high impact plastic above and adjacent the female side of the mold; activating a heater thereby heating the plastic sheet to a pliable state; activating the vacuum apparatus thereby drawing the plastic sheet into the female side of the mold; and removing the forme