BELT FURNACE FOR THICK FILM DRYING AND FIRING

Drying and firing processes are essential steps in making thick film circuits.

The purpose of drying is to remove the organic solvents and improve the film to substrate adhesion, making the products ready for further firing process. Drying temperature is about 100C-150C. IR furnace is usually used for thick film drying.

The purpose of firing is to realize the electrical properties of the ink/paste, and further improve film-substrate bonding. Firing profiles are different according to different paste/ink recipes. Usually paste/ink manufactures will recommend the profiles. Fig 1 is a typical thick film firing profile from Dupont.

 

Fig 1. A typical thick film firing profile from Dupont

Typical furnaces for thick film drying and firing

HSG series furnaces use IR heating tube to achieve the temperature range for thick film drying applications.

Below is the HSG6005-0304 Drying Furnace Specifications

Specification

HSG6005-0304

Rate Temperature

350 deg.C

Operation Temperature

RT+20-300 deg.C

Belt Width

600mm/24"

Heating Length

1500mm/59"

Control Zones

3

Speed Range

50-450mm(2"-18")/min (other speed range as required)

Outside Dimension

L3700mm/146" x W1200mm/47" x H1530mm/60"

Net Weight

500 KG

Power

AC 200-480V, 3 phase, 50/60HZ, 4/5 wire, 15KVA

Spare Part

2 heating tubes, cooling fan

Furnace for Firing Operation

HSK Series rapid firing furnace features an ultra-clean low-mass refractory heating chamber. The HSK model heats from ambient to 1,050C in approximately 40 minutes, and is designed to sustain continuous on/off heating and cooling cycles resulting from alternating periods of production and non-us. Below are some brief technical specifications.

Specification

HSK2505-0611

HSK3505-0711

HSK6305-0711

Rate Temperature

1050 deg. c

1050 deg. c

1050 deg. c

Belt Width

250mm/10"

350mm/14"

635mm/25"

Tunnel Height

50mm/2"

50mm/2"

50mm/2"

Heating Length

2700mm/106"

3150mm/124"

3220mm/127"

Cooling Length

1200mm/47"

1300mm/51"

1200mm/47"

Control Zones

6

7

7

Conveyor Speed

30-200mm(1.2"-8")/min

30-200mm(1.2"-8")/min

40-200mm(2"-8")/min

Overall System Width

1200mm/47"

1350mm/53"

1500mm/59"

Overall System Length

6905mm/272"

6905mm/272"

6905mm/272"

Overall System Height

1350mm/53"

1350mm/53"

1350mm/53"

Typical Temp. Uniformity

+/- 2 deg. c

+/-2 deg. c

+/-3 deg. c

Net Weight

1200kg

1600kg

2000kg

Power

AC 200-480V, 3 phase, 50/ 60HZ, 4/5 wire, 42KVA

AC 200-480V, 3 phase, 50/60HZ, 4/5 wire, 42KVA

AC 200-480V, 3 phase, 50/60HZ, 4/5 wire, 56KVA

Spare Part

1 set heating board, 1 solid relay, 2 relays, 2 switches

1 set heating board, 1 solid relay, 2 relays, 2 switches

1 set heating board, 1 solid relay, 2 relays, 2 switches