Kona Corporation

Synventive Molding Solutions, Inc.

Dynisco, Inc.

William J Hume

Michael Lewis Vasapoli

Paul M Swenson

Mark D Moss

David O Kazmer

Paul Michael Swenson

Wesley Drew Firisin

Michael A Doughty

A system and method are provided in which the rate of material flow to a plurality of gates can be controlled by a single controller. According to one embodiment, material is provided to first and second runners, the first runner comprising a plurality of distribution nozzles, and the flow to the first runner being controllable independently of the flow to the second runner.

Controlled injection using manifold having multiple feed channels

An injection molding nozzle for disposition in a mold. The nozzle is for injecting melt into a cavity of the mold, and includes a body having a through bore extending therethrough for receiving the melt. Attached to the body of the nozzle is a nozzle piece secured to the body that defines an outlet communicating between the body through bore and the cavity gate. A nozzle member surrounds the body at a position upstream of the nozzle piece and has an inner surface contacting the body, and an outer surface contacting the mold. The outer surface forms a seal against melt flow upstream from the nozzle member.

Injection molding nozzle

An injection molding nozzle is provided that includes a heater disposed about an insert seated in the nozzle body. The heater provides extra heat about the insert where heat loss to the mold can cause a reduction in melt temperature. The heater remains on from one injection cycle to the next injection cycle. In one embodiment, a thermocouple is used to measure the temperature about the insert so that the intensity of the heater can be adjusted accordingly. The heater can also be used with nozzles used in multiple nozzle applications to balance the flow of the nozzles.

Tip heated hot runner nozzle

A system and apparatus for injection molding articles of crystallizable polymeric materials in a substantially completely amorphous state is provided. The system includes (i) a mold defining an article formation cavity and an outer cavity connected by a gate, (ii) a melt transport mechanism including a bushing having a distal portion located in the outer cavity in close proximity to the gate inlet, and (iii) a source of molten material. The geometric configurations of the distal portion of the bushing, the inner portion of the outer cavity and the gate, and the relative locations of the distal end of the bushing and the inlet of the gate are each selected such that melt material may flow from the source through the melt transport mechanism and gate into the article formation cavity. The melt transport mechanism is maintained at a temperature above the characteristic crystal melt temperature of the polymeric material. The mold temperature is maintained well below the minimum characteristic glass transition temperature of the polymeric material. Further, the geometric configuration of the elements is selected such that the vestige which protrudes from the completed article has a minimum length, and such that during the interval between successive cycles only a small volume of melt located between the discharge orifice of the bushing and the outlet of the gate is allowed to crystallize.

System and apparatus for injection molding articles of amorphous

For open bore injection molding, the apparatus includes in combination a hot bushing, a cold mold, and a thin-walled seal. The bushing is adapted to convey molten material from a hot manifold to an article formation cavity in the mold. The mold defines a bore extending into its upper surface, and a gate at the bottom of the bore which communicates with the article formation cavity. The bushing at least partially fits within, and in spaced relation to, the periphery of the bore. The bushing includes an unobstructed lumen therethrough which opens into its lower end and is generally aligned with the gate. The bushing also defines a depressed portion in its outer surface located in closely spaced, circumferential relation to the opening of the lumen into its lower end. The thin-walled seal is formed of metallic material having low thermal conductivity, and has a generally arc-shaped cross-section. Further, the seal engages the depressed portion of the outer surface of the bushing, and has a small portion compressively urged against the surfaces defining the bore when the bushing is located in the bore. The seal closes off the gap between the bushing and the mold, while at the same time minimizing the conduction of heat therebetween.

Open bore injection molding apparatus

An injection molding apparatus and a bushing for use therein. Pressurized molten material flows intermittently from a source through runner channels in a heated manifold and internal lumens in heated bushings for injection through gates into article formation cavities of a mold. Each bushing includes a conically shaped, distalmost section extending substantially centrally into a mold gate. Each bushing also includes a distally opening annular cavity located between its distalmost section and its inner lumen. The annular cavity has outer walls which are substantially parallel to the bushing axis, and inner walls. The inner walls form a distally tapered shoulder having an outer edge and an inner edge. The outer edge extends substantially helically and distally along an axial projection of the proximal portion of the bushing. The inner edge extends substantially helically and distally along an axial projection of the smaller maximum diameter of the conically shaped portion. A portal connects the closed end of the annular cavity formed by the inner and outer walls to the molten material conveying internal lumen. Melt flow facilitation means such as grooves in the shoulders also are provided. The configuration of the annular cavity creates a substantially uniform, distally directed melt flow at its open end for injection into an article formation cavity along the conically shaped distalmost section.

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West Newbury, MA, United States of America

William J Hume