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Image: Coast Equipment & Services Company · Compact, high performance material handling systems from design to installation for the plastics industry · 302-337-3778
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Coast Equipment & Services
Div. of O.A. Newton & Sons
PO Box 397
16356 Sussex Highway
Bridgeville, DE 19933
Sales: 302-337-3778
Fax: 302-337-3780
sales@coastequipment.com
 
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Drying -Vacuum, Low Pressure Dryers
 
 
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Maguire Low Pressure Dryers Image:  Maguire Low Pressure Dryers (LPD) The Maguire Low Pressure Dryer (LPD) is a revolutionary device that uses vacuum to accelerate the resin drying process. The use of vacuum provides many process and cost benefits compared to conventional drying technology.

Maguire Products did not invent the science of low pressure (vacuum) drying. In fact vacuum drying has been used in the manufacturing process of plastic resins, chemicals, food and pharmaceuticals for many years. But, Maguire Products is the first to bring this technology to the plastics industry in a package that is affordable, reliable and simple to operate.

Speed of Drying
Typically the vacuum dryer will dry materials in one-sixth the time of a desiccant dryer. If your desiccant dryer drying time is 4 hours, the vacuum dryer will do the job in 40 minutes. The result is time-savings of 3 hours and 20 minutes every time you start up a dryer. This not only represents reduced energy cost (see below), but could also represent 3 hours and 20 minutes of additional production time.

Energy Savings
Side-by-side testing of the vacuum dryer and a desiccant dryer shows reduced energy consumption of 70 - 80%. The key to the reduced energy consumption is that the vacuum dryer does not rely on desiccant. Desiccant, once saturated, must be regenerated by a heating and cooling process so it will again be able to absorb moisture. All energy required to regenerate desiccant is lost to ambient.

Reduced Maintenance
Since desiccant degrades over time it must be replaced on a regular basis. This expense is avoided with a vacuum dryer. In addition the need to monitor the condition of desiccant is eliminated.

Low Material Stress
Long drying times at elevated temperatures can cause thermal, chemical and physical material degradation. Materials if exposed to prolonged elevated temperature during drying run the risk of degradation including discoloration and/or IV drop which leads to reduced physical properties of the end product. The reduced drying time required with the vacuum dryer dramatically reduces the risk of material degradation. Since the vacuum dryer first heats up the material, then applies vacuum to accomplish drying the heating cycle is only 20 to 30 minutes.

On-The-Fly Material Change
Additional savings can be achieved with the vacuum dryer in the form of on-the-fly material changes. Since the vacuum dryer dries in batches a material or color change can be accomplished on-the-fly. This means no downtime related to clean-out of the drying hopper during a material change. Every time you have a material change with a desiccant dryer the dryer must be shutdown and the drying hopper cleaned. This is normally a time-consuming, labor-intensive process. The vacuum dryer will automatically notify the operator when it's time to conduct an on-the-fly material change. No interruption of the drying process occurs during the on-the-fly material change.

Dryer Specifications

 

LPD 30

LPD 100 (LPD 12)

LPD 200

Standard version max.

265 ° F

265 ° F

265 ° F

High Heat version max.

300 ° F

300 ° F

300 ° F

Throughput

30 lb/h

100 LB/h

200 LB/h

Canister volume

0.32 cu ft

1.1 cu ft

2 cu ft

Empty weight

550 LB

730 LB

950 LB

Packing weight

620 LB

800 LB

1010 LB

Packing dim.
(L x W x H)

40"x35"x75"

40"x35"x85"

40"x35"x95"

Heater element

3 kW / 13A

5 kW / 22A

5 kW / 22 A

Blower

0.5 hp /2.5 A

2.5 hp /6.2 A

3.5 hp /6.2 A

Total Power Supply

460V/3Ph/60Hz

460V/3Ph/60Hz

460V/3Ph/60Hz

 

3.47 kW / 16 A

6.96 kW / 20 A

7.7 kW / 30 A

Compressed air requirement

70-90 psi

70-90 psi

70-90 psi

Compressed usage

0.4 cfm

2 cfm

2.4 cfm


Drying Times
This table shows the latest
recommended specifications for drying conditions. If the material you are running is not on this list, please contact Maguire to arrange testing.


MATERIAL

FINAL MOISTURE % *

CYCLE TIME (MINUTES)**

DRYING TEMPERATURE***

     

:C

:F

ABS

0.10

20 - 25

80 - 85

180 - 190

ABS/PC

0.02

25 - 30

100

210

LCP

0.02

20 - 50

150

300

PA

0.20 - 0.10

20 - 30

80 - 85

180 - 190

PBT

0.02

20 - 25

120

250

PC

0.02

20 - 25

120

250

PC/PBT

0.02

20 - 25

125

250

PEEK

0.20 - 0.10

25 - 30

150

300

PEI

0.02

40 - 60

150

300

PES

0.05 - 0.02

25 - 30

150

300

PET (Molding Grade)

0.010

30 - 35

150

300

PET (Preform, Ext.)

0.005

30 - 35

150

300

PMMA (Acrylic)

0.02 - 0.04

30

85

185

POM (Acetal)

0.20 - 0.10

25

80 - 110

180 - 230

PPO

0.02

25

100 - 120

210 - 250

PPS

0.02

25

150

300

PUR

0.02

25

125 - 140

260 - 280

PSU

0.02

25 - 30

150

300

SAN

0.20 - 0.10

20 - 40

80

180


Please note the following:

*

Final moisture content as recommended by the raw material manufacturer.

**

Recommended cycle time is based on average initial moisture content. For high initial moisture content cycle time should be extended 5 minutes. When in doubt please contact Maguire service.

***

Drying temperature as recommended by the material manufacturer.


Exclusive 5 Year Warranty Maguire Low Pressure Dryers carry a 5 year factory warranty. Maguire warrants this equipment to be free from defects in workmanship under normal use and service.