The PCB is prone to bending and warping when it passes through the reflow furnace, which makes people very distressed. So how to prevent PCB board from bending and warping through the reflow furnace? Let's explain it to you:

1.Reduce the influence of temperature on PCB stress
Since "temperature" is the main source of plate stress, as long as the temperature of the reflow furnace is reduced or the heating and cooling rate of the plate in the reflow furnace is slowed down, the occurrence of plate bending and plate warping can be greatly reduced. However, there may be other side effects, such as solder short circuit.

2.Use high Tg plate
Tg is the glass transition temperature, that is, the temperature at which the material changes from glass to rubber. The lower the Tg value of the material, the faster the plate begins to soften after entering the reflow furnace, and the longer the time to become soft rubber, the more serious the deformation of the plate. The use of plates with higher Tg can increase their ability to withstand stress and deformation, but the price of materials is relatively high.

3.Increase the thickness of the circuit board
In order to achieve the goal of thinner, many electronic products have left 1.0mm, 0.8mm and even 0.6mm thick plates. It is really a bit difficult to keep the plates from deforming after the reflow furnace. It is suggested that if there is no requirement of thinner, the plates can preferably use 1.6mm thick plates, which can greatly reduce the risk of bending and deformation.

4.Reduce the size of circuit board and the number of panels
Since most of the reflow furnaces use chains to drive the circuit board forward, the larger size of the circuit board will be dented and deformed in the reflow furnace because of its own weight, so try to put the long side of the circuit board on the chain of the reflow furnace as far as possible, which can reduce the dented deformation caused by the weight of the circuit board itself. This is also the reason for the reduction of the number of panels, Try to use the narrow edge perpendicular to the direction of furnace passage to achieve the minimum concave deformation.

5.Used reflow carrier
If the above methods are difficult to achieve, the last is to use the reflow carrier/template to reduce the deformation. The reason why the reflow carrier can reduce the bending and warping of the plate is that the template is expected to hold the circuit board until the temperature of the circuit board is lower than the Tg value and begins to harden again, and can maintain the original size..

If the single-layer template cannot reduce the deformation of the circuit board, it is necessary to add another layer of cover to clamp the circuit board with the upper and lower layers of templates, which can greatly reduce the deformation of the circuit board through the reflow furnace. However, the template is very expensive, and it has to be placed and recycled manually.

6.Use Router instead of V-Cut
Since V-Cut will destroy the structural strength of the panels between the circuit boards, try not to use the sub-panels of V-Cut or reduce the depth of V-Cut.

Kingtronics Components to use on your board:
GKT-Aluminum Electrolytic Capacitors, radial, axial, SMD, snap-in, Lug, screw types
Bridge Rectifiers: MB1S-MB10S, KBPC6005-KBPC610, KBP2005-KBP210
Diodes & Transistors: M7, 1N4007, LL4148, BZV55C, Fast Recovery Diodes
DKT-Super Capacitors: 2.7V, 3V Radial, Snap-in, Screw Type and 5.5V Coin Type
MLCC and Tancap: Multilayer Ceramic Capacitors and Tantalum Capacitors
KKT-Ceramic Capacitors: SMD 3mm Trimmer Capacitor 3pF, 6pF,10pF, 20pF, 30pF
RKT-Trimming Potentiometers: Rectangular, SMD, Square 3006, 3362, 3386, 3590
QKT-Crystals: Crystals and Oscillators size 1612 to 7050,Tuning Fork 32.768KHz
SKT-Surge Arresters: Axial and SMD Gas 2-Electrode and 3-Electrode Arresters
NKT-NTC Thermistors: NTC Negative Temperature Coefficient Thermistor
XKT-Varistors: Metal Oxide Varistor 05D, 07D, 10D, 14D, 20D
WKT-Switches: DIP and SMD Tact Switches
FKT-Film Capacitors: Metallized Polyester and Polypropylene Film Capacitor

 

Trimming potentiometers are Kingtronics' first products.
Kingtronics potentiometers (Kt trimming potentiometer) include following part number:
RKT-3006, RKT-3266, RKT-3269, RKT-3296, RKT-3323, RKT-3329, RKT-3362, RKT-3386, RKT-3306, RKT-3309, RKT-3540S, RKT-3590, RKT-C3305, RKT-065…
They are widely used in all below electronic equipment.

Welcome to check our website to find parts which fit your demand. https://www.kingtronics.com/trimming-potentiometers/
Kingtronics Kt RKT Trimming Potentiometers Product viseo: https://www.youtube.com/watch?v=ZQiJx5bjvbk

1. Air conditioners

29. Telephones

57. Video game systems

2. Bread makers

30. Fax machines

58. Toys & kits, electronics

3. Coffee/tea makers

31. Camcorders

59. Radio controls for models

4. Dental hygiene devices

32. Electronics for cameras

60. Metal detectors

5. Dishwashers

33. Digital cameras

61. Power tools

6. Door chimes, electronic

34. Cassette players for autos

62. LCD modules

7. Door opening systems

35. Car stereos

63. Sensors

8. Food processors

36. Auto repair instruments

64. Optical transceivers

9. Freezers

37. Cassette recorders

65. Televisions

10. Kitchen appliances

38. Compact disc players

66. Digital TVs

11. Microwave ovens

39. Hi-fi amplifiers

67. TV receivers

12. Kitchens

40. Hi-fi cassette decks

68. VCRs

13. Refrigerators

41. Stereo systems

69. HDTVs

14. Stoves/ovens

42. Tape recorders

70. Cable set-top boxes

15. Controls for white goods

43. Turntables

71. Satellite TV receivers

16. Environmental controls/equipment

44. Receivers

72. DVD players

17. Electronic insect repellants

45. Radios

73. DVD recorders

18. Intercom systems

46. Radio cassette recorders

74. Printers

19. Smoke detectors

47. Portable stereos

75. Photo printers

20. Thermostatic controls

48. Music centers

76. Laptops

21. Trash compactors

49. Music mixing equipment

77. Computers

22. Ultrasonic devices

50. Organs and musical instruments

78. Computer monitors

23. Amateur and CB radios

51. Clock radios

79. Computer power supplies

24. Cordless telephones

52. Clocks

80. Home networks

25. Telephone amplifiers

53. Digital table clocks

81. Personal computers

26. Telephone answering machines

54. Educational toys

82. Handhelds

27. Telephone dialers, automatic

55. Electronic games

83. PDAs

28. Telephone sets, digital

56. Game units

84. Portable CD

Kt Kingtronics Trimming Potentiometer Applications

Bridge rectifier circuit is the most used of a rectifier circuit. 
Such a circuit, simply by adding two diodes connected to port "bridge" structure, it has the advantage of a full-wave rectifying circuit, while a certain extent, overcome its shortcomings.

Kingtronics produce and sell many different kinds of bridge rectifiers. 
Bridge rectifier are widely used in LCD TV, CRT color TV sets, monitors, speakers, energy-saving lamps, microwave ovens, printers, set-top boxes, small household electrical appliances and other fields.

Contact us

Tel: (86) 769 8118 8110
Tel: (852) 8106 7033
Fax: (852) 8106 7099
E-mail: info@kingtronics.com
Skype: kingtronics.sales
MSN: kingtronics-sales@hotmail.com
Web: www.Kingtronics.com
YouTube: www.youtube.com/c/Kingtronicskt

About

Kingtronics International Company was established in 1995 located in Dongguan City of China to handle all sales & marketing for factories located in Chengdu, Sichuan and Zhaoqing, Guangdong, China. In 1990, we established the first factory to produce trimming potentiometer and in 1999 we built up new factory in Zhao Qing, Guangdong. Now with around 850 workers, Kingtronics produce trimming potentiometers, dipped tantalum capacitors, multilayer ceramic capacitors, and diode & bridge rectifier. We sell good quality under our brand Kingtronics, and Kt, King, Kingtronics are our three trademarks. All our products are RoHS compliant, and our bridge rectifier have UL approval. Please visit our Products page, you could please download all our PDF datasheet and find cross reference for our Trimming Potentiometer and capacitors.

Tantalum and Ceramic Capacitors Cross Reference ↓ Download
Diodes & Rectifiers List(PDF: 97KB) ↓ Download
Trimming Potentiometer Cross Reference ↓Download

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