1. RAW MATERIAL SELECTION 4
1-1 MAIN TYPE OF PLASTICS APPLIED ON MONITOR 4
1-2 CHARACTERISTICS OF PLASTICS MATERIAL 6
1-3 CRITERIA FOR PLASTICS SELECTION 8
1-4 FLAME RETARDATS 8
2. CABINET DESIGN GUIDELINES 12
2-1 GENERAL 12
2-2 MATCHING WITH PICTURE TUBE 18
2-3 CRT SHIFT PREVENTION 18
2-4 MAIN CASSIS FIXATION 19
2-5 CRT BOARD FIXATION AND LIMITATION 21
2-6 DESIGN FOR ASSEMBLY AND TRANSPORTATION 22
2-7 DESIGN FOR DISASSEMBLY 22
2-8 DISPLAY OPENING SIZE 22
2-9 LCD DISPLAY 23
3. PICTURE TUBE FIXATION 25
3-1 AN AUTO-ADJUSTING DEVICE IS NEEDED TO PREVENT THE CABINET DEFORMATION DUE TO LARGE TOLERANCE IN HEIGHT OF CRT’S EARPLUG 25
3-2 CRT FIXATION TYPES 25
3-3 CRT MOUNTING ON THE METAL FRAME 29
4. CONTROLKNOB UNIT 30
4-1 POWER BUTTON 30
4-2 CONTROL BUTTON 36
5. POPOUT KNOB DELET 36
6. LIGHT GUIDE 38
6-1 PRINCIPLES OF LIGHT GUIDE 38
6-2 MATERIALS 45
6-3 SURFACE TREATMENTS 46
6-4 DESIGN PROCEDURES (ILLUSTRATED BY AN EXAMPLE) 47
7. SPEAKER GRILLE FIXATION 49
8. SAFETY CONCERNED RELATED
TO MECHANICAL 50
8-1 MATERIALS FOR ENCLOSURES AND FOR DECORATIVE PARTS 50
8-2 OPENINGS IN ENCLOSURES 50
8-3 REQUIRED SAFE DISTANCES 51
8-4 ADJUSTABLITY OF DISPLAY SCREEN 52
8-5 GLOSS FACTOR OF DISPLAY SCREEN CASING 52
8-6 PHYSICAL REQUIREMENTS 53
8-7 CONTROL AND INDICATORS 53
8-8 THE RADIUS OF OUTSIDE EDGES AND CORNERS OF PLASTIC HOUSING OF PRODUCT SHOULD BE NOT LESS THAN 2 MM 53
8-9 THE WARNING TEXT FOR CRITICAL COMPONENT IS GIVEN BELOW: (ON BACK COVER INSIDE) 53
9. COLOR INSPECTION CRITERIA 54
9-1 SCOPE 54
9-2 APPLICATION 54
9-3 MEASUREMENT INTRODUCTION 54
9-4 STANDARD COLOR DATA 58
9-5 COLOR APPROVED PROCEDURE/ STANDARD COLOR DATA STORAGE OFRESIN 58
9-6 STANDARD COLOR CHIP 60
10. REQUIREMENT FOR DECORATIVE SURFACE 63
10-1 INSPECTION INSTRUCTION 63
10-2 CONDITIONS FOR INSPECTION 63
10-3 LIMIT VALUES 64
10-4 DEFECTS PER ZONE FOR TABLE 1 65
10-5 DEFECTIVE PHENOMENA FOR TABLE 2&3&4 65
10-6 “PHILIPS” FINSHED SET APPEARANCE ZONE CLASSIFICATION 66
11. PEDESTAL DESIGN GUIDELINES 67
11-1 DESIGN GUIDELINE 67
11-2 SPECIFICATION OF TILT FORCE 71
PC/ABC
PC/ABC is a material which can be moulded in thin wall, has a high impact strength and is considered environmentally friendly, because of the use of phosphorous based flame-retardants.
ABS V0
This material is used very widely and is most suitable. It is not halogen/Sb2O3 free, but its price makes it the lowest cost flame-retardant alternative.
HIPS V0
HIPS V0 in light colour is susceptible to yellowing, although by taking appropriate measures this can be avoided.
ABS (Acrylonitrile Butadiene Styrene)
ABS offers more gloss and impact strength than HIPS, but is also much more expensive. If using a non-flame-retardant material, then HIPS is better option for dark coloured products. In telefax business formerly ABS V0 was used, but now a normal ABS is used in combination with metal/flameretardant shield of a few critical parts, such as the power supply.
HIPS
HIPS is used for TV cabinet. It is used in high end monitors, where an internal metal shield provides fire protection. HIPS in light colours is also susceptible to yellowing although by taking appropriate measures this may be avoided. (Except USA, at least 94V-1 for USA market)
Mod. PRO (Noryl)
Noryl is PRO/HIPS blend, which used phosphorus based flame-retardant. The main disadvantage of this material is the bad UV stability (yellowing ), predominantly in light colours. The advantages include thin wall moulding, shorter cycle times, lower density and moderate price level. GE Plastics holds the monopoly in this material (Noryl).
Remarks:
1. If these monitors have an internal metal shielding, the cabinet material can be developed in ABS-HB or HIPS-HB in considerable price reduction. (94-HB is not allowed for USA)
2. *) If the net weight of monitor <18 kg, the cabinet material should be V0.
3. The monitors allowed only two kinds of plastics to fulfill TCO99.
Correct wording of flammability class as following
1. 94V-0
2. 94V-1
3. 94V-2
4. 94HB
5. 94-5V
1-2. CHARACTERISTICS OF PLASTICS MATERIAL
The following table lists the main physical properties, which are crucial to design requirements:
PC/ABS:
PC/ABS SPECIFICATION QUICK REFERENCE
Supplier/Type IZOD impact
(kg-cm/ cm)
1/4 t Heat deflects.
Temperature
(°C) Melt flow
Index
(g/10min) Tensile
Strength
(psi)
Specific
Gravity
Mold
Shrinkage
( ﹪) UL V-
0
mm
UL
5V
mm UV resists.
E
(300h)
Blue Angel/
TCO95
G.E.
C2800
C2950HF
C6200
43.6
43.6
54.5
>80
>80
>80
8500
9300
9700
1.17
1.18
1.18
0.4~0.6
0.4~0.6
0.4~0.6
1.5
1.5
1.5
2.3
2.5
2.3
<1.5
<1.5
<1.5
OK
OK
OK
BAYER
FR-90
OK
CHEIL
NH-1000A
60
80
40
8700
1.22
0.4~0.6
1.6
OK
CHEIL
NH-1000T
40
76
40
9490
1.17
0.4~0.6
2.12
2.54
OK
Remark: Please refer Suppliers’ spec. for more details in specification if required.
ABS:
ABS-FR
Supplier/Type IZOD impact
(kg-cm/ cm)
1/4 t Heat deflects.
Temperature
(°C) Melt flow
Index
(g/10min) Tensile
Strength
(psi) Specific
Gravity
Mold
Shrinkage
( ﹪) UL
V-0
mm UL
5V
mm UV resist.
E
(300h) Blue Angel/
TCO95
CHEIL
VH-800P
VH-0810
VH-0815
VE-0855
VE-0856
VE-0812
Supplier/Type IZOD impact
(kg-cm/ cm)
1/4 t Heat deflects.
Temperature
(°C) Melt flow
Index
(g/10min) Tensile
Strength
(psi) Specific
Gravity
Mold
Shrinkage
( ﹪) UL
V-0
mm UL
5V
mm UV resist.
E
(300h) Blue Angel/
TCO95
CHEIL
HR-1360
10
83
4
4640
1.04
0.3~0.6
OK
CHI-MEI
PH-88
9.0
82
5
3550
1.05
OK
PS-HB
Supplier/Type IZOD impact
(kg-cm/ cm)
1/4 t Heat deflects.
Temperature
(°C) Melt flow
Index
(g/10min) Tensile
Strength
(psi) Specific
Gravity
Mold
Shrinkage
( ﹪) UL
V-0
mm UL
5V
mm UV resist.
E
(300h) Blue Angel/
TCO95
CHEIL
SD-0150
23
91
1.8
6540
1.05
0.3~0.6
OK
CHI-MEI
PA-717C
28
88
1.4
6380
1.04
OK
CHEIL
SD-0150
27
88
4.5
5950
1.04
OK
CHEIL
SD-0150
15
94
3.9
1.05
0.4~0.6
1.6
OK
1-3. CRITERIA FOR PLASTICS SELECTION
The following list is the preferred minimum threshold of physical properties for cabinet design:
Type Notch Impact
kj/m² Specific
Gravity Tensile strength
N/mm² (Psi) Heat deflection
Temperature C Color Stability
UV E(300hr)
Shrinkage
Rate ﹪ UL
V-0
(mm) rating
5V
(mm)
ABS >20 <1.25 >40(5800) >78 <8 0.3~0.6 <2.1 <2.7
PC/ABS >40 <1.2 >45(6525) >80 <3 0.4~0.6 <1.6 <2.5
1-4. FLAME RETARDANTS
A: 2 types of flame retardants used for plastics:
- Halogen + Antimony
- Halogen includes the following elements:
- Iodine, Bromine, Chlorine and Fluorine
- Bromide most often used because it is cheap and effective
- Antimony is necessary as a synergist
- Synergist increases the rate of reaction
- Plastics using this flame retardant includes : ABS, PS, etc.
- Phosphorus + Nitrogen
- Nitrogen act as a synergist for phosphorus
- Plastics using this flame retardant includes : PC, PPO, etc.
B: Flame retardant ratings for plastics
-UL 94 Horizontal Burn Test
The burning rate of a horizontal test specimen
Most engineering thermoplastics can pass HB test without flame retardants.作者: townyee 时间: 2006-3-31 11:17
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或者发到 townyee@163.com作者: luwenm 时间: 2006-4-7 21:16
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