Gas Assist Brochure - Air Compressor Manufacturer · PDF filehigh pressure compressors and boost-ers you can, ... air/gas system. ... inch differential (psid)

GAS ASSIST SOLUTIONSFrom the Injection Molding Experts

SYSTEMS SERVICE TRAINING WORLDWIDE

BAUER PLASTICS TECHNOLOGY GROUP36830 Metro Court, Suite ASterling Heights, MI 48312TEL. +1 (586) 264-0360FAX +1 (586) [email protected]

12.07.BCIsubject to alteration without notice or obligation

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CONTENTS SYSTEMS

Turnkey Systems

MISSION STATEMENTTo be the global leader by supply-ing the best quality product whilecontinuously improving throughinnovation.

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APPLICATIONS / 0104 FAQs

GAS ASSIST / 0206 Overview

COMPRESSION / 0308 Nitrogen controllers10 Nitrogen generation12 Compressors and boosters

STORAGE / 0414 High pressure

ACCESSORIES / 0516 From the source

COMPANY / 0618 Commitment to quality

INNOVATION / 0720 Compressor technology

BAUER GROUP / 0822 Worldwide

TRAINING WORLDWIDESERVICE

Contents

FAQsFAQs

APPLICATIONS

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APPLICATIONS SYSTEMS

AUTOMOTIVE CONSUMER MEDICAL

What is gas assist injectionmolding?The most effective method of apply-ing pressure to an injection moldedpart during cooling.

Gas assist injection molding is a lowpressure process which reduces theclamp tonnage required for molding.Gaseous nitrogen is applied internally,either directly into thicker sections ofthe part or via a network of gas chan-nels. Through proper design, thislower gas pressure is applied evenlythroughout the part and sustainedduring the entire cooling phase, there-by eliminating potential defects.

Packing force must be applied andmaintained to an injection molded partas it cools. Conventional moldingoften results in relatively high pressurewithin the mold cavity, which cancause flash, premature tool wear, sinkmarks and shrink.

What can gas assist do for me?Gas assist injection molding willlower your production costs.

There are many benefits associatedwith the gas assist process.

Clamp Tonnage ReductionSignificant cost savings can be realizedvia reduced clamp tonnage; in somecases, gas assist can lower these

requirements by 30% to 70%. Evenwith a full resin shot gas is able to pen-etrate, if only to take up volumetricshrinkage within the cavity. As a result,tools that would normally run in 1500ton presses can be placed in smallerpresses. The reduction in machinerycost, potential energy savings, andincreased flexibility to quote jobsbeyond current tonnage capacity canmake any project interesting.

Cycle Time ReductionNitrogen extends the flow of resin as ittravels through the part, completing fillwhile displacing resin from thick areasof the part. With less material in thickareas, cooling time and cycle time arereduced; cycle times for some thickwalled parts have been reduced morethan 50%. With thin wall parts, cycletimes can be reduced by replacing thepack and hold phase of the processwith gas pressure, allowing for screwrecovery immediately after injection.

Resin SavingsWith today’s resin pricing, part weightreduction is important to molders.Handles and similarly thick-sectionedparts are ideal candidates for gas assistand offer potential for significantweight reductions, but resin savingsare also possible in thin walled parts.In many parts nominal wall thickness

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can be reduced when using gas assist,increasing part strength. With propertool design, gas assist will also allowyou to reduce scrap rates.

Improved Part QualityGas assist technology can improve thequality of products having certaindimensional and appearance require-ments. Recent trends have reducednominal wall thickness and increasedboss and mounting configurations,which can result in added stresses,shrinkage, surface defects and imper-fections. Thin walled parts with heavybosses are also susceptible to sink.When properly applied, gas assist caneliminate these quality concerns.

Design FreedomGas assist offers certain freedoms todesigners that are unachievable withconventional methods. Heavy wall sec-tions can intersect thinner ones, ribsand bosses can be designed thickerthan the nominal wall without fear ofsinks, mechanical tool movementsused for coring can be eliminated, andparts can be designed with thick sec-tions that will become hollow. Whenthe runner system is designed withinthe part, gas assist can potentiallyeliminate the added expense and com-plications (weld lines) associated withhot manifold systems.

ELECTRONICS

A

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Source of nitrogen in the form of nitrogenbottles, fluid tank or nitrogen generator

High pressure compressor unit and suitably sized andrated storage facility for the compression and storageof nitrogen at elevated pressures

High pressure stainless steel lines to transport the nitrogen

Nitrogen control unit that generates a pressure/time profile toaccurately and repeatedly dispense the nitrogen

Gas injectors and injection nozzles to deliver nitrogen into the plastic parts

Process Consultation- Part design and mold filling analysis- Mold trials and process demonstrations - Project evaluation and tool layout assistance

2 CompressionGA SERIES and BK SERIES BOOSTERS

- Up to 6000 psig and 27 scfm- Up to 400 bar and 45 Nm3/hr- Complete unit with N2 purification and storage

3 InjectionGAS INJECTORS

- For molding machines of 20 tons or larger- 5 1/2 inch length and 13/4-8 thread size- Simple disassembly for easy maintenance

B

B

A

A

C

A

B

C

D

E

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Overview

GAS ASSIST SYSTEMS

Universal Self ActuatingShut-Off Nozzle

Tool Face MountedGas Assist Injector Pins

Vent Control Valve®

4 ControlNCM-1 and NCU-V2

- Control units for gas injection technology- Up to 5000 psig (345 bar)- Up to 4 independently controlled channels (NCU-V2 only)

5 OptimizationVENT CONTROL VALVE®

- Latest advance in high pressure regulator protection- For use with any gas assist control unit- 4 1/2 inch length

6 Support and Service- Installation / start-up services- Maintenance / repair services - Operational / process training

D

D

D

C

E

E

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Nitrogen controllersNitrogen controllers

PRODUCTS

COMPRESSION SYSTEMS

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NCU NCM MNR-0025

EXCELLENCEInjection molding is a study in preci-sion, a symphony of numerousprocesses working simultaneously tocreate a single part. If even one of theprocesses is even the slightest bit off,the part can be compromised. This isparticularly true with gas assist injec-tion molding, where the timing of gasinjection can make the differencebetween a Class A part and scrap.Given the ever-rising costs of energyand raw materials, you need the assur-ance that your gas assist controls canperform consistently and accurately,time and time again.

BAUER understands that reliability andoptimal performance are extremelycritical for these applications. That’swhy we’ve worked for many years todevelop the very best high pressuregas assist injection molding solutionsin the world. Our systems are designedfor designing gas assist profiles thatare easy to configure, repeatable, andreliable

When you need control of your gasassist process, BAUER PlasticsTechnology Group is there.


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MFC

Nitrogen generationNitrogen generation

COMPRESSION SYSTEMS

SNGII (to 6000 psi) SNGII-LP (to 150 psi) NGM

PRODUCTS

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CUSTOM DESIGN

WHY BUY NITROGEN WHENYOU CAN MAKE YOUR OWN?Nitrogen is a versatile and crucial com-ponent of any gas assist operation.When it isn’t available at the pressures,capacities, and purities you need, itcan create high scrap counts and evenbring your processing operations to astandstill. Even when it is available,poor quality gas can result inunplanned maintenance issues andunnecessary downtime. Given theever-rising costs and increased safetyrequirements for manufacturing oper-ations, you need the assurance thatyour nitrogen systems can performconsistently and accurately, time andtime again.

BAUER understands that reliability andoptimal performance are extremelycritical for these applications. That’swhy we’ve worked for many years todevelop the very best high pressuregas assist injection molding solutionsin the world. Our systems are designedto safely deliver consistent purity athigher capacities than ever before. Itbegs the question: Why buy nitrogen,when you can make your own?

When you need nitrogen, BAUERPlastics Technology Group is there.

Technical DataModel Product flow at Product flow at Product flow at

99.5% purity 99.0% purity 98.0% purity

scfm1) l/min scfm1) l/min scfm1) l/min

5000 psig (345 bar)

SNGII-15305 4 113 5.5 156 7.5 212

SNGII-20410 7 198 11 311 14 396

SNGII-30615 13 368 18 510 26 736

SNGII-40815 25 708 26 736 27 765

6000 psig (414 bar)

SNGII-15376 10 254 10 254 10 254

SNGII-40820 25 708 25 708 25 708

1) Capacity (FGD) is referenced to standard conditions. Tolerance +/- 5%.Dimensions and weight are approximate and are dependent upon model and drive.

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PRODUCTS

Compressors and boostersCompressors and boosters

COMPRESSION SYSTEMS

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MINI VERTICUS MAXI VERTICUS VERTECON

COST EFFECTIVEFor many molders, purchasing nitro-gen is a part of the day-to-day opera-tions. For those who use this nitrogenin support of the gas assist process,returning bottles with substantiallyunused gas is wasteful and a drain onthe bottom line. Given the ever-risingcosts of merchant-supplied gas, youneed the assurance that you can atleast use what you purchase. With ourhigh pressure compressors and boost-ers you can, time and time again.

BAUER understands that reliability andoptimal performance are extremelycritical for these applications. That’swhy we’ve worked for many years todevelop the very best high pressuregas assist injection molding solutionsin the world. Our systems are designedto completely empty your merchantgas bottles and recompress the gas toa higher pressure, giving you full valuefor your purchased gas.

When you need efficiency and opti-mum performance, BAUER PlasticsTechnology Group is there.


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CUSTOM PACKAGES

High pressureHigh pressure

STORAGE SYSTEMS

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PRODUCTS

UN/ISO ASME LOW PRESSURE STORAGE

ENERGY IN RESERVEWhen an application requires storage,either in the form of a single cylinderor multiple cylinders, arranged eitherfor bulk or in banks for cascading, aproperly sized storage system offersmany benefits to the compressedair/gas system. The main purpose ofstorage is to serve as a reservoir tohandle constant, sudden or unusuallyhigh demands for air/gas that canexceed the capacity of the compressor.Storage protects the compressor fromthe direct demand of the system aswell as serving to dampen or eliminatepressure pulsations to the system.

Each high pressure application must becarefully reviewed to determine thebest type and size of storage to use.The cost of equipment as well as oper-ational and maintenance costs can bereduced by properly matching thecompressor to the storage system.BAUER recommends that the compres-sor does not start more than 4 timesper hour to avoid short-cycling of thecompressor. Short-cycling can be detri-mental to the compressor, motor,compressor control system and to thehigh pressure system. Our StorageBrochure will serve as a guide toselecting the best storage system solu-tion for your application.

The volume of storage required for aspecific application depends upon:

A. Consumption rate of the system

B. Capacity of the compressor/booster

C. Deadband of the final pressure sen-sor

STORAGE SIZINGBulk storage for limiting the number ofcompressor starts to 4 times per hourcan be calculated by the following for-mula:

VR = 58 x (QC / Δ P)

Where:

- VR = Volume of storage, cubic feetwater volume

- QC = Capacity of compressor,standard cubic feet per minute (scfm)

- Δ P = Approximate deadband of finalpressure sensor, pounds per squareinch differential (psid).

Multiple cylinders and banks can beused for applications that require alarge volume of storage. ContactBAUER for sizing storage with multiplebanks for cascading.

TECHNICAL DATABAUER is knowledgeable in the appli-cation of storage to medium and highpressure applications. We offer cylin-ders for storage to meet the coderequirements of either the AmericanSociety of Mechanical Engineers(ASME) or the United Nations (UN)Model Regulations (ISO 9809-PART 2).Refer to the Storage brochure for tech-nical data when storing inert gases.The table provides a summarization oftechnical data for cylinders offered byBAUER when storing air.

SYSTEMAll UN cylinders are shipped with aprotective cap for the cylinder valve.Valve caps are shipped installed onloose cylinders and shipped loose withracked assemblies. The mandatoryretest period for these UN cylinders isevery ten (10) years. Under no circum-stances are these cylinders to be filledto a pressure exceeding the markedservice pressure at 70 ºF.


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CUSTOM PACKAGES UN/ISO ASME

Model Weight*

lbs kg

UN 4500 455 206

UN 5000 475 215

UN 6000 525 238

ASME 935 424*2-cylinder rack with bottles.

From the sourceFrom the source

QUALITY U.S. Patent # 6,904,925

ACCESSORIES SYSTEMS

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INJECTION NOZZLE INJECTION PINS VENT CONTROL VALVE

QUALITYIt’s the little things that matter mostwith injection molding. Small pieces,such as slides or ejectors, play big rolesin the molding process and are crucialto the finished product. The same prin-ciple applies to gas assist, where thelittle things such as injectors help toprecisely target the injection point ofnitrogen to deliver the very bestresults. Given the ever-increasingneeds for efficiency and reliability, youneed the assurance that the littlethings will work as consistently as thebig things.

BAUER understands that reliability andoptimal performance are extremelycritical for these applications. That’swhy we’ve worked for many years todevelop the very best high pressuregas assist injection molding solutionsin the world. Our accessories are appli-cation-tested and designed for simpleinstallation and maintenance. We’re soconfident about our capabilities thatwe’ve even written a book on theprocess – feel free to contact us andtake advantage of our industry-leadingexpertise!

When you need knowledge and sup-port, BAUER Plastics Technology Groupis there.


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MANUAL

#8-32 THREAD

.320” .630”.062”

5/32 HEX

.187”

.125” .090”

1/4 - 28 THREAD

.320” .645”

7/32 HEX

.250”

.150”

INJ-0001 (3/16” Gas Injector Pin)

INJ-0016 (1/4” Gas Injector Pin)

Commitment to qualityCommitment to quality

SYSTEMSCOMPANY

CAD DESIGN LASER CUTTING ROBOTIC BRAKE

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CUSTOMER SATISFACTIONBAUER begins with expert system eval-uation and continues with the design,installation, training and support serv-ices to ensure the highest quality andoptimum performance of the product.


EXPERIENCE FOR YOUR BENEFITBAUER compressor systems are field-proven in a multitude of diverse plas-tics processing applications world-wide. More than 60 years of combinedexperience, research and developmentare in place to find the very best solu-tions to your plastics processingrequirements. We are world renownedfor reliability and durability, and BAUERas a company is recognized as a lead-ing innovator in the design and manu-facture of high pressure compressorsolutions.

BAUER is especially capable of workingwith clients on a worldwide basisbecause of our vast network of salesand service centers around the globe.BAUER’S U.S. operations include a115,000 sq ft manufacturing facility inNorfolk, VA and branch offices inMichigan, California and Florida.

DEDICATION TO YOUBAUER is committed to the philosophythat customer satisfaction is achievedthrough a strategy of continuousimprovement using in-house researchand development, engineering, manu-facturing and support services. OurISO 9001 registered quality manage-ment system is testament to our com-mitment to quality and customer satis-faction.

BAUER COMPRESSORS INC. Norfolk, Virginia USA

BAUER Block Manufacturing Geretsried, Germany

ROBOTIC WELDING BAUER UNIVERSITY TRAININGQUALITY

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Compressor technologyCompressor technology

INOVATION SYSTEMS

COMPRESSORS AND BOOSTERS

Booster 15.x 22.x 23.x

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BAUER ADVANTAGES...Wide range of capacity and pressure inboth compressor and booster configu-ration allows tailoring a solution tomeet specific requirements.

Proven air-cooled design is economi-cal, reliable and environmentallyfriendly. An external power source isnot required and no coolant.

Large surface area and fine ribbing oncylinders provides efficient heat dissi-pation for lower operating tempera-tures.

Aftercooler provides low dischargetemperature. Supplemental cooling atthe outlet is not required.

Pressurized lubrication ensures reliablelubrication of all internal componentsfor extended compressor life. Oil filterprotects the lubrication system.

Roller or needle bearing used at eachbearing surface for reduced frictionand optimum mechanical efficiency.Compressor runs cooler, oil life isextended and maintenance is reduced.

Heavy-duty roller bearings to supportthe crankshaft. 30,000 hours designlife.

Aluminum alloy crankcase usedthrough 30 hp enables compactdimensions because of rapid heat dis-sipation. Cast iron crankcase used on40 hp and greater to support greater

forces. High capacity cooling fan(s)provide efficient cooling.

Encapsulated crankcase to protect theenvironment from oil laden mist.

High efficiency intake filter to protectthe compressor from damaging parti-cles.

Safety valve after each stage of com-pression to protect the compressorfrom overpressure and to safeguardthe operator. Gas compressors andboosters also include a safety valve atthe inlet.

Balanced flywheel and counterbal-anced crankshaft results in nearlyvibration-free operation. BAUER com-pressors and boosters do not requirespecial foundations which reducesinstallation cost.

Readily accessible valves do not requiredisassembly of compressor piping foreasy accessibility and reduced mainte-nance cost and downtime.

Corrosion resistant materials used forcoolers, separators and valves forlonger life and reduced maintenance.

Genuine spare parts at affordableprices.

Operation and maintenance manualwith illustrated parts lists.

...FOR YOUR BENEFIT

25.x and 28.x

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Worldwide

BAUER GROUP SYSTEMS

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BAUER OFFICESPTG DISTRIBUTORS


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Documents

Gas Assist Brochure - Air Compressor Manufacturer · PDF filehigh pressure compressors and boost-ers you can, ... air/gas system. ... inch differential (psid)