Go with the flow...

...of gas assist...

...and save!


Bryan Custom Plastics

now offers

the unique advantages of

gas-assisted injection molding

to make larger,

more intricate

better quality

molded components

with lower material costs.

That means fewer

multi-part assemblies —

which lowers your

assembly costs, as well!


Bigger and better

molded components

at less cost

with gas-assisted

injection molding...

Bryan Custom Plastics — one of America’s premier producers of large, custom, injected-molded components — is now offering the remarkable CINPRES II gas-assisted injection molding process.  Developed in the United Kingdom, the technology employed in CINPRES II (which is an abbreviation of Controlled INternal PRESsure) permits fabrication of larger, more intricate molded plastic components using less material in manufacture.  And it eliminates several problems inherent in conventional injection molding that can impose design restrictions and compromise product quality.

The Process...

CINPRES II technology involves a controlled flow of gas inserted in a measured quantity directly into molten polymer as the material is being injected into a mold cavity.  Because the gas is under greater pressure, it compresses the polymer against the mold surfaces, creating hollow areas in predetermined patterns throughout the piece.  The displacement caused by the gas reduces the amount of polymer material required, lessening the weight of the finished component and actually increasing strength through the creation of internal surfaces.  Multiple gas “channels” can be designed in, to correspond with the outer contours of the component, and can be made as large as needed, depending on the thickness of the piece at any point.

The Benefits...

• Lower Fabricating Costs — The gas assist in the CINPRES II process reduces the amount of pressure required in injection molding, making it possible to use smaller presses to fabricate larger pieces with lower energy consumption and a shorter production time cycle.  Additional savings are realized through the use of less polymer material because of the hollow areas, as well as by reducing the need for costly molding trials and pre-production tool modifications.

• Greater Design Flexibility — The added strength provided by increasing the internal surface area makes it possible to fabricate larger pieces with less structural ribbing and a degree of dimensional stability previously unobtainable.  There is complete flexibility in the number and placement of gas jets, so designers have virtually unlimited freedom to specify size, contour and thickness, or to combine thin and thick sections in any configuration within the same molding.

• Better Control and Appearance — The CINPRES II process maintains pressure more uniformly throughout the cooling process, reducing laminar flow and eliminating molded-in stress, volumetric shrinkage and other distorting factors.  The lower pressure requirements greatly reduce sink marks and other surface imperfections, so appearance is enhanced over all and maintained at a consistently high level.

How It Works...

In the CINPRES II process a controlled flow of inert gas (nitrogen) is used to core out a molten polymer inside a mold cavity.  The gas does not mix with the polymer material, as happens in the structural foam process.  Instead, reflecting the well established principles of fluid dynamics, the gas penetrates the less viscous parts of the melt, following a natural path in response to variations in temperature and pressure.  By controlling the amount of gas injected into the hollow core, pressure is maintained on the cooling polymer, compensating for material shrinkage and preventing sink marks on the surface.  When the plastic has cooled, the gas nozzle is withdrawn, and the gas is allowed to vent.

• Stage 1 — Injection of polymer material begins.

• Stage 2 — Flow of gas begins as polymer injection nears completion.

• Stage 3 — Gas fills the component, packing polymer material throughout the mold.

• Stage 4 — Gas pressure is maintained as plastic cools.

• Stage 5 — Plastic is solid, and gas nozzle is withdrawn, allowing gas to vent.

Call Bryan Custom Plastics

and save with CINPRES II...

Go with the flow!  Find out how the CINPRES II gas-assisted injection-molding process can provide you with bigger, more intricate and better quality plastic components — with lower costs all around.  Call Bryan Custom Plastics today.

• • •

Business-to-Business Promotion

Late 1990s

Brochure explaining the production advantages of a new system of gas-assisted injection molding in plastic component manufacturing

Services Provided

  1. Research/Interviewing

  2. Copywriting

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