94 results about "Low pressure molding" patented technology

A method of molding components of a shopping cart using high or low pressure molding processes. The molding processes eliminate sink marks in plastic components of the shopping cart while providing structural integrity thereto. The processes used to mold the components of the shopping cart can create either or both a center channel in the molded components and / or a plurality of voids within the molded components. If hollow channels are formed in the molded components then the plurality of voids will be formed in the walls of such molded component if both processes are used together. The processes used to form the molded components are either (i) a gas assist process which provides a laminar stream of blowing agent into the stream of molten resin after the molten resin is forced into a partially filled mold or (ii) a structural foam molding process which provides a blowing agent blended into the molten resin prior to the molten resin being forced into the mold.

The invention discloses a method for forming a pipe fitting with internal high pressure and external low pressure. The method comprises the steps that a pipe fitting to be formed is put into a cavity,a swelling region is formed between the pipe fitting to be formed and the inner wall of the cavity, low pressure fluid is continuously injected into the swelling region, then high pressure fluid is injected into the inner part of the pipe fitting to be formed, the high pressure fluid forms the pressure on the outer wall of the pipe fitting to be formed, so that the pipe fitting to be formed expands to the swelling region, when the pipe fitting expands to fit the inner wall of the cavity, supplying of the low pressure fluid is stopped, the formed pie fitting is taken out, and a working cycle is completed. The invention further discloses a forming machine, and the pipe fitting is formed according to the forming machine for a pipe fitting with internal high pressure and external low pressure. According to the method for forming a pipe fitting with internal high pressure and external low pressure, a first through hole and a second through hole are formed in a die for circulating the low pressure fluid into and out of the swelling region, a certain pressure P1 is formed for pipe fitting, so that it is guaranteed that the pipe fitting can swell uniformly everywhere, and a good forming effect is achieved.

A process for producing a multicolored coverstock (10, 20, 72) providing at least two thermoplastic or thermoplastic olefin sheets (12, 14, 58). Each of the sheets includes a different color. The process includes directing the sheets into a position where the edges (24, 26) of the sheets overlap. The sheets are laminated together and are laminated to a foam substrate (22, 60) by directing the sheets and the foam substrate through an embossing nip (72). The embossing nip is further operative to impart an embossed surface in the sheets (18). The resulting laminated coverstock may be used in vacuum forming, low pressure molding, and compression molding of interior trim parts of automobiles and other vehicles.

A hot runner system includes a having a cavity. Melt is fed from a source of melt into the cavity, and a valve isolates melt in the cavity from melt in the source. A plunger within the cavity is driven forward to inject melt in the cavity into a mold cavity at high pressure without significantly increasing the pressure of melt in the source. The plunger optionally functions as both the plunger and the valve by opening and closing communication between the cavity and the manifold as it is rotated.

A packaging structure of a low-pressure molded fuel cell comprises a hot melt adhesive layer, which is formed through a low-pressure molding process using a hot melt adhesive that has specific material properties and will become molten when being heated. The molten hot melt adhesive is injected into the cell via injection holes formed on a housing or a mounting element to flow through a C-sectioned flow channel, so as to tightly enclose and bond to edges of the air cathode and separator for the cell. After the hot melt adhesive is solidified, a chemical-resistant hot melt adhesive layer with good sealing and enclosing ability as well as high adhesion strength and elasticity, being bubble removed at controlled pressure and the hot melt adhesive material is formed to firmly bond to the cell components and tightly seal the cell, so as to effectively prevent electrolyte in the cell from leaking.