Linde LLC is helping plastic injection molders reduce cycle times, increase production and solve hot spot challenges with advanced carbon dioxide (CO2) or liquid nitrogen supply and control systems, featured at NPE 2015 in Orlando, Florida, 23-27 March.  

Linde will also promote its solvent-free CRYOCLEAN® Snow cleaning system that can remove many types of residue from parts prior to painting and clean moulds with a stream of dry ice particles.  The CO2 cleaning process can eliminate process steps and reduce floor space requirements currently needed in water cleaning methods.

For makers of PS/XPS foams, Linde will feature an eco-friendly alternative to hydrocarbon blowing agents.  

Linde’s PLASTINUMTM family of precision metering, cooling, pressure boosting and control systems include:
1.        Cost-effective, high-pressure CO2 system for enhanced Gas-Assist Injection Moulding (eGAIM)
2.        High-pressure nitrogen boosting system for traditional Gas-Assist Injection Moulding (GAIM)
3.        Spot cooling system for mould hot spots
4.        High-pressure CO2 metering system for extrusion foaming

Precision cooling and pressurising systems are important for manufacturing a range of engineered plastics parts for automotive, medical, aerospace, electronics, appliance and MIL-spec applications.  Inert gases may cool the polymer products from in- or outside a mould, or just focus on a specific hot spot.

eGAIM Shortens the Cooling Cycle

This new gas assist technology developed by Linde leverages the pressure and cooling attributes of liquid CO2 to reduce cycle times of hollow-channelled parts such as handles from the inside. The patented eGAIM system has been shown to reduce cooling cycles by 30% or more compared to nitrogen systems.  (Linde also offers liquid nitrogen systems for traditional GAIM processes.)

“The use of CO2 in gas-assist injection moulding is new to the plastics industry, especially in the US,” says Jim Stanley, program manager, plastics industry program manager for Linde.  “Our high-pressure injection system helps our customers to rapidly complete the mould fill for faster mould release, better surface characteristics and more repeatable parts quality.”

CO2 Spot Cooling Cuts Mould Cycle Times

The cooling of long, thin cores, fillets, ejectors or difficult to reach parts often leads to problems. Linde’s proprietary CO2 spot cooling helps achieve more uniform cooling across the part geometry. As developed by Linde with manufacturers around the world, spot cooling has in some cases cut cycle times by up to 50%.

High-tech, cryogenic gas technology provides rapid cooling using inert gases, such as liquid carbon dioxide (CO2), or nitrogen (N2), for moulding, extruding and foaming applications. Linde can provide turnkey solutions and supply both CO2 and N2 through its nationwide distribution network.

XPS/PUR Foaming with CO2 Cuts Hydrocarbons

High-efficiency CO2 blowing agents for extruded polystyrene (XPS) and polyurethane (PUR) foaming can reduce or eliminate the need for flammable blowing agents, such as pentane and butane and other ozone-depleting compounds.

The Linde plastics team reviews processing challenges and develops solutions for injection-moulding, foaming and plastic part painting and coating, as well as manufacturers and designers of plastics parts.