Dental Series Furnaces

Dental Production Laboratory Furnaces

The LA-series furnace is an economical general purpose furance for dental production applications. Nitrogen process gas is controlled much like a clean room: pressurized gas is pushed through the heating chamber insulation providing a pre-heated, laminar flow for a uniform, stable atmosphere. Precise temperature is maintained by control thermocouples above the belt in each zone quickly sensing changing conditions. IR quartz heating lamps inside the chamber instantaneously adjust their output to achieve tight temperature control: each load through the furnace sees the same temperature.

Computer Controlled. The furnace is operated via TPS FurnaceControl software installed on a robust industrial rack mount furnace computer. The responsible engineer can easily vary process parameters using the sophisticated PID and power control parameters in the software. An almost infinite number of recipes and profiles can be labeled and stored for each dental appliance process for ready access on the furnace computer. The operator simply starts the furnace, loads the recipe. In about 15-30 minutes the software will signal to begin processing product.

Laboratory and Production Applications. The LA-Dental series furnace is an efficient tool for many dental production and laboratory uses. With its tight temparature control and nitrogen controlled atmosphere, it can process substrates, wafers, metal, ceramic, glass, or polycarbonate parts for dental bonding, epoxy and polymer curing, thick film firing, ceramic bonding, as well as titanium and porcelain veneering, and metal brazing, annealing, tempering and sintering applications. Its performance characteristics are ideal for dental laboratory work or production applications where consistency and repeatablility are important. Rapid startup and response to recipe changes make it uniquely qualified for development work and applications where a number of processes are run.

Specialty Brazing. The LA-Dental series furnace is particularly suited for dental brazing applications including silver alloys with copper, zinc, tin, cadmium and/or nickel. Zone 1 quickly brings the parts to the first hold temperature. Zone 2 will precisly hold the parts for the duration requried to achieve activation of flux systems. Zone 3 spikes the temperature for sufficient time so alloy materials properly melt and flow into the joint. The CACT cooling tunnel cools at a rate for the liquid to solidify in place and control distortion in a nitrogen environment to produce bright, high strength joints.

About Model Choices. The LA-Dental series furnace is most commonly ordered as an LA-309N with a 9" wide belt. A narrower 6" belt and a wider 10" belt are offered for special applications. The standard dental furnace is configured with three (3) zones (Z1=7.5", Z2=15", Z3=7.5"). Zone 1 is configured to ramp parts quickly to operating temperature. Zone 2 is longer for dwell time. Zone 3 is short and can be used to extend Zone 2 dwell, begin controlled cooling, or spike the temperature, if necessary. If finer resolution is requried, the funace can configured with four (4) equal 7.5" zones (LA-309X) to provided greater flexibility.

Furnace Arrangement

Parameter LA-306N, LA-309N, LA-310N LA-306X, LA-309X, LA310X
Load Station 38 cm (15 inches) 38 cm (15 inches)
Entrance Baffle with Venturi Exhaust 38 cm (15 inches) 38 cm (15 inches)
IR Heating Chamber, Zone 1 19 cm (7.5 inches) 19 cm (7.5 inches)
IR Heating Chamber, Zone 2 38 cm (15 inches) 19 cm (7.5 inches)
IR Heating Chamber, Zone 3 19 cm (7.5 inches) 19 cm (7.5 inches)
IR Heating Chamber, Zone 4 none 19 cm (7.5 inches)
Exit Baffle 38 cm (15 inches) 38 cm (15 inches)
CACT Closed Atmosphere Cooling Chamber 76 cm (30 inches) 76 cm (30 inches)
Unload Station 38 cm (15 inches) 38 cm (15 inches)

Feature LA-306N, LA-306X LA-309N, LA-309X LA-310N, LA-310X
Belt Width 6 inches
(15.2 cm)
9 inches
(22.8 cm)
10 inches
(25.4 cm)
Entrance Exhaust Stack 1 standard 1 standard 1 standard
Exit Exhaust Stack 0 (optional) 1 standard 1 standard
Edge Heaters n/a optional 1 pair standard

Furnace Specifications

Parameter LA-306N, LA-309N, LA-310N LA-306X, LA-309X, LA310X
Process Gas CDA, Nitrogen (-N), or noncombustible Forming Gas (-FG)
Control Zones 3 zones 4 zones
Heating Chamber length 76 cm (30 inches) 76 cm (30 inches)
Cooling Chamber 36 cm (30 inches) CACT – CDA or N2 convective and radiant cooling, exterior fan heat removal.
Belt Speed 2.5-25 cm/min (1-10 ipm)
5.0-50 cm/min (2-20 ipm)
10-100 cm/min (4-40 ipm)
(or as specified)
Conveyor Belt SS-316 Stainless steel or BNV- low mass, stabilized Nichrome-V
Exhaust Improved venturi exhaust stack(s) to reduce process gas consumption.
Max Design Temperature 600 C or 1000 C
Electrical All models include universal transformers which accommodate 208-480 Vac and 50/60 Hz frequency anywhere in the world, allowing furnace relocation without external equipment. All furnace systems are phase balanced to improve facility efficiency. IR lamp controls automatically keep IR spectrum constant.

Facility Requirements

Model Power Configuration
3 phase, 50/60 Hz
Connected Load Typ Operating @ 800 C
3-Zone Models 208 Vac
220-240 Vac
380-400 Vac
415 Vac
440-500 Vac
18.2 kW, 50.6 A
21.0 kW, 50.4 A
19.1 kW, 27.6 A
20.2 kW, 28.1 A
23.5 kW, 28.3 A
9.7 kW, 26.8 A
11.1 kW, 26.7 A
10.1 kW, 14.6 A
10.7 kW, 14.9 A
12.4 kW, 14.9 A
4-Zone Models 208 Vac
220-240 Vac
380-400 Vac
415 Vac
440-500 Vac
19.4 kW, 54.0 A
22.5 kW, 54.1 A
18.3 kW, 26.5 A
19.4 kW, 27.0 A
22.5 kW, 27.0 A
10.3 kW, 28.6 A
11.9 kW, 28.6 A
9.7 kW, 14.0 A
10.3 kW, 14.3 A
11.9 kW, 14.3 A
Parameter Process Section Typ 425 C operation (CDA exchange rate: 2x, balanced flow) Low O2 operation, 800 C (N2/FG exch rate:3x, 50 sLpm excess flow)
Process Gas Supply Gas 1 357 Lpm @ 5 bar
(756 scfh @ 70 psig)
96 sLpm @ 5 bar
(203 scfh @ 70 psig)
Gas 2 (Heating Chamber only) n/a 69 sLpm @ 5 bar
(146 scfh @ 70 psig)
Process Gas Exhaust Gas 1 + Gas 2 357 sLpm
(756 scfh)
115 sLpm
(243 scfh)
Enclosure Ventilation Furnace Cabinet, vent to
room or exhaust system
260 Lpm @ 30 C   (550 cfm @ 86 F)

Length 3.01 m (120 inches)
Width 1.1 m (42.5 inches)
Height (min-max) 1.74-1.9 m (68.4-74.9 inches)*
Adjustable Conveyor Height 91.4 cm +10/-6.3
(36 inch +4.0/-2.5)
91.4 cm +10/-0.0
(36 inch +4.0/-0.0)
Weight 730 kg (1600 LB)

*minimum height with castors off; maximum  height with chamber raised using MCL.

LA Dental Series Standard Features and Options

Standard OEM features and options are listed below. Click on hyperlink for feature details.

Code Description Code Description Code Description
CXE15 Load Extension, 380 mm CXX15 Unload Extension, 380 mm DGO Dual Gas Operation (annealing, thick film)
EM Element Monitoring System OA Oxygen Analyzer AFR Coalescing Air Filter Regulator
MA Moisture Analyzer EH Edge Heaters (-309, -310) MCL Motorized Chamber Lift
LT Process Ready Light Tower CB-3 3-PH Circuit Breaker Disconnect PH1-5 Product Clearance (1"-5" available)

Many more options can be selected to configure the furnace for your particular application.

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