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

THERMAL PROCESSING SECTIONS
ParameterLA-306N, LA-309N, LA-310NLA-306X, LA-309X, LA310X
Load Station 38 cm (15 inches)38 cm (15 inches)
Entrance Baffle with Venturi Exhaust38 cm (15 inches)38 cm (15 inches)
IR Heating Chamber, Zone 119 cm (7.5 inches)19 cm (7.5 inches)
IR Heating Chamber, Zone 238 cm (15 inches)19 cm (7.5 inches)
IR Heating Chamber, Zone 319 cm (7.5 inches)19 cm (7.5 inches)
IR Heating Chamber, Zone 4none19 cm (7.5 inches)
Exit Baffle38 cm (15 inches)38 cm (15 inches)
CACT Closed Atmosphere Cooling Chamber76 cm (30 inches)76 cm (30 inches)
Unload Station38 cm (15 inches)38 cm (15 inches)

FURNACE FEATURES BY MODEL
FeatureLA-306N, LA-306XLA-309N, LA-309XLA-310N, LA-310X
Belt Width6 inches
(15.2 cm)
9 inches
(22.8 cm)
10 inches
(25.4 cm)
Entrance Exhaust Stack1 standard1 standard1 standard
Exit Exhaust Stack0 (optional)1 standard1 standard
Edge Heatersn/aoptional1 pair standard

Furnace Specifications

SPECIFICATIONS
ParameterLA-306N, LA-309N, LA-310NLA-306X, LA-309X, LA310X
Process Gas CDA, Nitrogen (-N), or noncombustible Forming Gas (-FG)
Control Zones3 zones4 zones
Heating Chamber length76 cm (30 inches)76 cm (30 inches)
Cooling Chamber36 cm (30 inches) CACT – CDA or N2 convective and radiant cooling, exterior fan heat removal.
Belt Speed2.5-25 cm/min (1-10 ipm)
5.0-50 cm/min (2-20 ipm)
10-100 cm/min (4-40 ipm)
(or as specified)
Conveyor BeltSS-316 Stainless steel or BNV- low mass, stabilized Nichrome-V
Exhaust Improved venturi exhaust stack(s) to reduce process gas consumption.
Max Design Temperature600 C or 1000 C
ElectricalAll 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

FACILITY REQUIREMENTS
ModelPower Configuration
3 phase, 50/60 Hz
Connected LoadTyp Operating @ 800 C
3-Zone Models208 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 Models208 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
ParameterProcess SectionTyp 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 SupplyGas 1357 Lpm @ 5 bar
(756 scfh @ 70 psig)
96 sLpm @ 5 bar
(203 scfh @ 70 psig)
Gas 2 (Heating Chamber only)n/a69 sLpm @ 5 bar
(146 scfh @ 70 psig)
Process Gas ExhaustGas 1 + Gas 2357 sLpm
(756 scfh)
115 sLpm
(243 scfh)
Parameter    
Enclosure VentilationFurnace Cabinet, vent to
room or exhaust system
260 Lpm @ 30 C   (550 cfm @ 86 F)

Dimensions
Length3.01 m (120 inches)
Width1.1 m (42.5 inches)
Height (min-max)1.74-1.9 m (68.4-74.9 inches)*
Adjustable Conveyor Height91.4 cm +10/-6.3
(36 inch +4.0/-2.5)
91.4 cm +10/-0.0
(36 inch +4.0/-0.0)
Weight730 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.

FEATURES AND OPTIONS
Code DescriptionCode DescriptionCode Description
CXE15Load Extension, 380 mmCXX15Unload Extension, 380 mmDGODual Gas Operation (annealing, thick film)
EMElement Monitoring SystemOAOxygen AnalyzerAFRCoalescing Air Filter Regulator
MAMoisture AnalyzerEHEdge Heaters (-309, -310)MCLMotorized Chamber Lift
LTProcess Ready Light TowerCB-33-PH Circuit Breaker DisconnectPH1-5Product Clearance (1"-5" available)

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

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