IPC-TM-650 EN 2022 试验方法.pdf - 第357页

4.7 Unless otherwise specified, press the specimen with a force of 840 lb (31.0 psi) ± 5% for 10 minutes minimum. Full force is to be applied within 15 seconds after sample is placed on the press plate. 4.8 Carefully rem…

1.0

Scope

This

procedure defines a test method used to

determine the scaled flow parameters of an epoxy resin, pre-

impregnated glass fabric (prepreg). The test is appropriate for

checking material consistency, but is not solely intended for

defining the suitability of prepreg to be used in a specific

printed wiring board product or process.

2.0

Terms and Definitions

2.1 Scaled Flow Parameter Test

test procedure

intended to measure multilayer lamination prepreg flow char-

acteristics.

3.0

Apparatus

3.1 Test Specimen

The

prepreg specimen size shall be

5.50 ± 0.05 inches by 7.00 ± 0.05 inches. Specimens shall be

cut with the 7 inch dimension parallel to the machine (warp)

direction.

3.2

Release Material

The

release material shall be polyvi-

nyl fluoride (PVF) or equivalent at least7x9inches in size.

3.3

Tape

shall be suitable for holding the sample dur-

ing processing.

3.4

Press Plate

The

press plate used shall be metal

between 0.125 to 0.250 inches thick, and 4.50 ± 0.01 x 6.00

± 0.01 inches in size. The plate shall be flat and parallel within

0.001 inches.

3.5

Lamination Press

lamination press with a minimum

platen size of8x8inches, capable of applying a uniform

pressure of 840 lb force (31.0 PSI) ± 5% and capable of

maintaining a temperature range of 120-180°C with a toler-

ance of ± 2° of required temperature.

3.6

Prepreg Cutting Equipment

Cutter

capable of main-

taining tolerances defined in 3.1.

3.7 Balance

balance capable of weighing to ± 0.01

gram.

3.8

Micrometer

measuring instrument for measuring

thickness to ± 0.0001 inch.

3.9

Desiccator

stabilization chamber (drying cabinet)

with significant desiccant (calcium sulfate or equivalent)

capable of maintaining less than 10% relative humidity at 21 ±

2°C (70 ± 5°F).

4.0

Test Procedure

4.1 Specimen Conditioning

The

specimens shall be cut

to size and then placed in a stabilization chamber (see 3.9) for

a period of 24 hours. Testing shall be performed within 15

minutes of removal from chamber.

Note:

Specimens

tested

within 15 minutes of their manufacture need not be desic-

cated.

4.2

Specimens

shall be gathered into a stack for test pur-

poses. Number of plies shall be determined from Table 1.

able 1

Glass

Thickness Number of Plies (stack-up)

Up to 0.0025 in. (i.e., style

104, 106, 108, etc.)

18-20

*Greater than 0.0025 in (i.e.,

style 112, 113, 116, etc.)

Note:

Glass

styles thicker than style 116 have shown some

difficulty in consistency of test results.

4.3

Weigh

stack of prepreg to the nearest 0.01 gram, record

weight as Wo.

4.4

Center

press plate (see 3.4) on the laminating press

platen. Close press and preheat lamination press (see 3.5)

and press plate to 150 ± 2°C. (Other temperature can be used

as agreed upon by user and vendor.)

4.5

Place

the stack of prepreg on one of the release sheets

(see 3.2) which has been previously cut toa7x9inch size.

Use tape to hold the sample in place. Position tape on

opposite corners, such that it does not interfere with the 4.5 x

6.0 inch specimen center to be tested. The second release

sheet is placed on top of the stack to form a sandwich. See

Figure 1.

4.6

Open

press and immediately place the stack sandwich

on the press plate, being careful to center the stack on the

press plate.

Note:

Make

sure that the release material is in

place.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.38

Subject

Prepreg

Scaled Flow Testing

Date

6/91

Revision

Originating Task Group

N/A

Material

in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.

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4.7

Unless

otherwise specified, press the specimen with a

force of 840 lb (31.0 psi) ± 5% for 10 minutes minimum. Full

force is to be applied within 15 seconds after sample is placed

on the press plate.

4.8

Carefully

remove the hot specimen from the press, flip

over onto a smooth flat surface and cool for 5 minutes or to a

rigid state before making measurements.

4.9

Remove

release material from stack. Using the template

shown in Figure 2, mark the points to be measured. Cut the

stack when required to facilitate measuring the specific points

along the cut line shown in Figure 2.

5.0

Test Results

5.1

Measure

the thickness to the nearest 0.0001 inch with a

micrometer at the three intervals defined by the template.

Record all three measurements for each test specimen. If

there is a thickness variation between the three measure-

ments of 0.003 inches or more, the test must be repeated.

Average the three measurements to determine final measured

thickness.

5.2

Use

the initial weight, WO, to determine the initial thick-

ness (Ho) either from the formula in Appendix or from Table 2.

5.3

Final

thickness per ply can be calculated by dividing the

final measured thickness by the number of plies. Initial thick-

ness and final thickness can be used to calculate thickness

change.

Appendix

Determination

of Initial Thickness: (See Table 2)

ho =

(5.54

x 10

−2

)−

2.12

x 10

−2

Where:

= Initial thickness per ply (mils)

Wo = Initial stack weight (g)

Wg = Unit glass weight (g/in2)

n = Number of plies

Unit Glass Weights: (Approximated from test results)

Style

104

106

108/1080

112/2112

113/2113

116/2116

7628

Weight (g/in2)

0.0128

0.0164

0.0311

0.0464

0.0538

0.0691

0.1312

IPC-2438-1

Figure

IPC-2438-2

Figure

IPC-TM-650

Number

2.4.38

Subject

Prepreg

Scaled Flow Testing

Date

6/91

Revision

age2of3

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able 2 Initial Stackweight (Wo, grams) vs. Calculated Initial Thickness (ho, mils)

104

106 108 112 113 116 7628

Wo ho Wo ho Wo ho Wo ho Wo ho Wo ho Wo ho

20 1.03 25 1.28 40 1.95 35 3.13 35 2.97 45 3.82 80 6.71

21 1.10 26 1.35 41 2.02 36 3.24 36 3.09 46 3.94 81 6.73

22 1.16 27 1.41 42 2.08 37 3.36 37 3.21 47 4.06 82 6.85

23 1.23 28 1.48 43 2.15 38 3.48 38 3.32 48 4.17 83 6.97

24 1.29 29 1.54 44 2.21 39 3.60 39 3.44 59 4.29 84 7.08

25 1.36 30 1.61 45 2.28 40 3.71 40 3.56 50 4.41 85 7.20

26 1.43 31 1.68 46 2.34 41 3.83 41 3.67 51 4.52 86 7.32

27 1.49 32 1.74 47 2.41 42 3.95 42 3.79 52 4.64 87 7.44

28 1.56 33 1.81 48 2.47 43 4.07 43 3.91 53 4.76 88 7.55

29 1.62 34 1.87 49 2.54 44 4.18 44 4.03 54 4.88 89 7.67

30 1.69 35 1.94 50 2.60 45 4.30 45 4.14 55 4.99 90 7.79

31 1.75 36 2.00 51 2.67 46 4.42 46 4.26 56 5.11 91 7.91

32 1.82 37 2.07 52 2.73 47 4.54 47 4.38 57 5.23 92 8.02

33 1.88 38 2.13 53 2.80 48 4.65 48 4.50 58 5.35 93 8.14

34 1.95 39 2.20 54 2.86 49 4.77 49 4.61 59 5.46 94 8.26

35 2.01 40 2.26 55 2.93 50 4.89 50 4.73 60 5.58 95 8.38

36 2.08 41 2.33 56 2.99 51 5.01 51 4.85 61 5.70 96 8.49

37 2.14 42 2.39 57 3.06 52 5.12 52 4.97 62 5.82 97 8.61

38 2.21 43 2.46 58 3.13 53 5.24 53 5.08 63 5.95 98 8.73

39 2.27 44 2.52 59 3.19 54 5.36 54 5.20 64 6.05 99 8.85

40 2.34 45 2.59 60 3.26 55 5.48 55 5.32 65 6.17 100 8.96

41 2.40 46 2.65 61 3.32 56 5.59 56 5.44 66 6.29 101 9.08

42 2.47 47 2.72 62 3.39 57 5.71 57 5.55 67 6.40 102 9.20

43 2.53 58 2.78 63 3.45 58 5.83 58 5.67 68 6.52 103 9.32

44 2.60 59 2.85 64 3.52 59 5.95 59 5.79 69 6.64 104 9.43

45 2.66 50 2.91 65 3.58 60 6.06 60 5.91 70 6.76 105 9.55

Wo = grams, ho = mils; (n) for 104, 106, 108 = 18; (n) for 112, 113, 116 7628 = 10

Reference Documents

1. Journal of Elastomers and Plastics, 10,367 (1978), C.J. Bartlett

2. Journal of Elastomers and Plastics, 10,365 (1978) D.P. Bloechle

3. IPC-TP-281, The Use of Scaled Flow Testing for B-Stage Prepreg, C.J. Bartlett, D.P. Bloechle, W.A. Mazeika

4. IPC-TP-418, Application of Scaled Flow Testing as an Incoming Inspection Criteria, H.J. Brown

5. IPC-TP-420, Scaled Flow for Testing CRC Prepreg, J. Del, P. Marx, J. Sallo

6. D.P. Bloechle, ‘‘Epoxy Prepreg Characterization using Scaled Flow Testing Techniques,’’ Circuit World, 9,1 (1982), p.8

IPC-TM-650

Number

2.4.38

Subject

Prepreg

Scaled Flow Testing

Date

6/91

Revision

age3of3

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