IPC-TM-650 EN 2022 试验方法.pdf - 第159页

lay flat to one another. Using a 25.4 mm [1.0 in] diameter hole punch, cut 2 holes at least 25.4 mm [1.0 in] apart (See Figure 1) in approximately the middle of the specimen. Caution should be taken during cutting in ord…

1.0

Scope

This

test method is designed to measure the

Resin Flow of ‘‘no flow’’ prepreg used for bonding and adhe-

sion without formation of resin bead as caused by flow of the

resin.

2.0

Applicable Documents

None

3.0

Test Specimens

3.1 Size and Configuration

specimen shall consist of

multiple plies of prepreg cut approximately 102 mm [4.0 in] x

102 mm [4.0 in]. If the reinforcement is a continuous fiber

woven fabric, the sides shall be cut on a bias to the fabric

weave. Unless otherwise specified, the test specimen shall

have three plies.

3.2

Quantity and Sampling

Unless

otherwise specified,

the number of specimens tested shall be as follows: For quali-

fication testing, 3 specimens shall be tested, with the pieces

for each taken from areas of the prepreg that represents the

center and both edges of the material as impregnated. For lot

testing, one specimen shall be tested, with the pieces ran-

domly taken from the prepreg. Pieces shall be taken no less

than 25.4 mm [1.0 in] from the impregnated edge.

4.0

Apparatus or Material

4.1 Laminating Press

Unless

otherwise specified, a lami-

nating press capable of maintaining at a temperature of 171 ±

2.8°C [340 ± 5°F] and capable of providing a pressure of 1380

± 70 kPa [200 ± 10 psi] on the test sample, see 6.1

4.2

Hole Punch

Hole

cutting tool, such as a hole punch or

die set capable of cutting a 25.4 ± 1.3 mm [1.0 ± 0.05 in] hole.

4.3

Materials

4.3.1

Release

material shall be Tedlar type (polyvinyl fluo-

ride, PVF), or equivalent, of 0.05 mm [0.002 in] thickness,

maximum, at least as large as the size of the caul plates.

4.3.2

Any

copper-clad laminate of thickness between 0.25

mm [0.010 in] and 0.38 mm [0.0151 in] shall be cut to

approximately 152 mm x 152 mm [6.0 in x 6.0 in].

4.3.3

Conformal

press pad material equivalent to 0.5 mm

[0.020 in] cotton linter paper, and cut to approximately 152

mm x 152 mm [6.0 in x 6.0 in].

4.4

Measuring Microscope

Bausch

and Lomb, model

SUB–73 stereozoom microscope with 31–16–08 micrometer

disc, Carl Zeiss Stage Micrometer, or equivalent.

4.5

Caul Plates

Caul

plates shall be 3.2 mm [0.125 in]

thick and 152 mm [6.0 in] square and made from type 304

steel, or equivalent.

4.6

Desiccator

Desiccation

chamber capable of maintain-

ing an atmosphere of less than 30% RH, at 23°C [73°F].

5.0

Procedure

5.1 Specimen Preparation

5.1.1

The

prepreg shall be cut to conform with the speci-

men size and configuration as per 3.1.

5.1.2

testing is to be performed more than 10 minutes

after the prepreg has been manufactured, specimens shall be

desiccated for 4 ± 1/4 hrs. prior to testing.

5.1.3

Cleaning of Copper Cladding

When

applicable for

referee purposes, clean the metallic cladding on the copper

clad laminate by wiping the copper cladding with isopropyl

alcohol. The copper clad laminate shall be immersed in suit-

able container containing 22-23° BAUME 20 percent by vol-

ume solution of hydrochloric acid, technical grade, maintained

at 21°C ± 5.6°C [170°F ± 10°F] for a period of 15 seconds.

After removal of the copper clad laminate from the hydrochlo-

ric acid, the copper cladding then shall be rinsed with a cold

water spray rinse for 5 seconds and blown dry with filtered, oil

free, compressed air.

5.2 Measurement

5.2.1

specimen shall be formed by stacking three plies of

prepreg with the grain of the reinforcement aligned in the

same direction. Only if necessary to prevent ply slippage, tack

the three plies together using a standard soldering iron within

one quarter inch from one or more corners so that the plies

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.17.2

Subject

Resin

Flow of ‘‘No Flow’’ Prepreg

Date

8/97

Revision

Originating Task Group

MIL-P-13949 Test Methods Task Group (7-11b)

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.

age1of3

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lay

flat to one another. Using a 25.4 mm [1.0 in] diameter hole

punch, cut 2 holes at least 25.4 mm [1.0 in] apart (See Figure

1) in approximately the middle of the specimen. Caution

should be taken during cutting in order to prevent any loose

fibers from protruding into the clearance hole. Measure the

diameter of each hole in 3 places, each approximately 60°

radial angle from the others and determine the average diam-

eter of the holes.

5.2.2

Place

the stack onto and in the middle of a 152 mm x

152 mm [6.0 in x 6.0 in] copper clad laminate of thickness

between 0.25 mm [0.010 in] and 0.38 mm [0.015 in] thick and

cover the stack with a sheet of release film. Over the release

film place 2 pieces press pad material. For referee purposes,

the surface of the copper cladding shall be cleaned immedi-

ately prior to lay-up using the procedure in paragraph 5.1.3.

(The cleaning is to standardize the surface against which the

resin will flow.)

5.2.3

Place

the stack (specimen plus laminate, release, and

padding) between the two caul plates. Load the stack into the

laminating press maintained at 171°±2.8°C [340°±5°F] and

close immediately to 1380 ± 70 kPa [200 ± 10 psi]. After

holding at full pressure for 20 minutes, minimum, release the

pressure and remove the package.

5.3

Evaluation

After

the package has cooled to room

temp, measure the diameter of the punched holes at the point

of maximum and minimum diameter as formed by the resin

flow. Subtract the average diameter of holes obtained in 5.2.1

from the maximum and minimum diameters.

5.4

Report

The results shall be reported including the fol-

lowing:

1. Identification of specimens tested.

2. Resin flow, for each specimen tested in terms of the maxi-

mum flow and minimum flow in millimeters (thousands of

an inch) for both die-cut holes.

6.0

Notes

6.1

Agreement

between supplier and user other than that

specified in 4.1 may be necessary for specific resin

chemistries.

6.2

Desiccator Conditions

The

Test Methods Task Group

determined that a great majority of test laboratories are unable

to consistently hold the Relative Humidity in a desiccator to

less than 20%. Based on data from participating company lab

management, the lowest practically feasible RH for use with

the affected IPC Test Methods is 30% maximum.

IPC-TM-650

Number

2.3.17.2

Subject

Resin

Flow of ‘‘No Flow’’ Prepreg

Date

8/97

Revision

age2of3

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IPC-23172-fig1

Figure

IPC-TM-650

Number

2.3.17.2

Subject

Resin

Flow of ‘‘No Flow’’ Prepreg

Date

8/97

Revision

age3of3

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ