IPC-TM-650 EN 2022 试验方法.pdf - 第156页

5.2.8 Weigh the circular specimen on the analytical balance to the nearest 0.005 gram. Record this as the disc weight, or W D . 5.3 Calculation The resin flow is calculated as follows: Resin Flow, Percent = ( W O − 2W D …

1.0

Scope

This

test method is designed to measure the

Resin Flow Percent by weight in prepreg.

2.0

Applicable Documents

None

3.0

Test Specimens

3.1 Size and Configuration

specimen shall consist of

multiple plies of prepreg cut 102 ± 0.25 mm [4.0 ± 0.010 in]

by 102 ± 0.25 mm [4.0 ± 0.010 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 four plies.

(Note:

an alternative specimen

configuration commonly used is a stack that weighs approxi-

mately 20 g.)

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 specimen taken from areas of the prepreg that rep-

resents the center and both sides of the material as impreg-

nated. For lot testing, one specimen shall be tested, with the

pieces randomly taken. Pieces shall be taken no closer to the

selvage (or cut edge) than a distance equal to one-tenth of the

width of the roll.

4.0

Apparatus or Material

4.1 Laminating Press

Unless

otherwise specified, laminat-

ing press capable of maintaining a temperature of 171 ± 3°C

[340 ± 5°F] and capable of providing a pressure of 1380 ± 70

kPa [200 ± 10 psi] on the test specimen (see 6.1).

4.2

Analytical Balance

Analytical

balance capable of

weighing to the nearest 0.001 gram.

4.3

Plates

Caul

plates approximately 3.2 mm [0.125 in]

thick and at least 152 mm x 152 mm [6.0 in x 6.0 in], but no

larger than the press platen size, and made from type 304

steel, or equivalent.

4.4

Circle Punch

punch or die set capable of cutting a

circle 81.1 mm [3.192 in] in diameter.

4.5

Desiccator

Desiccation

chamber capable of maintain-

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

4.6

Release Material

The

release material shall be Tedlar,

Type MR, (polyvinyl fluoride, PVF) or equivalent, cut at least as

large as the caul plates.

5.0

Procedure

5.1 Specimen Preparation

5.1.1

The

prepreg shall be cut to conform with the speci-

men size and configuration, see 3.1.

5.1.2

For

referee purposes only, specimens shall be desic-

cated for a minimum of 4 hours.

5.2

Measurement

5.2.1

Determine

the weight of each specimen to the nearest

0.005 gram. Record this as the original weight, or W

5.2.2

Stack

the plies of prepreg for one specimen with the

grain of the cloth aligned in the same direction and place

between two pieces of release film. Place this package

between two caul plates that are at room temperature.

5.2.3 Place

specimen and caul plates in a preheated lami-

nating press maintained at the specified temperature and

immediately apply pressure such that the specified pressure is

achieved within 5 seconds after press closure. Unless other-

wise specified, the temperature shall be 171 ± 3°C [340 ± 5°F]

and the pressure shall be 200 ± 10 psi [1380 ± 70 kPa].

5.2.4

Maintain

the specified pressure for 10 + 6, – 0

minutes.

5.2.5

Open

press, remove specimen, and allow to cool to

room temperature.

5.2.6

applicable, post cure the test specimen in accor-

dance with the manufacturer’s post cure method (in order to

prevent specimen damage by cutting).

5.2.7

Using

the punch and die set, remove a circular disc

measuring 81.1 mm [3.192 in] in diameter from the center of

the specimen.

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

Subject

Resin

Flow Percent of 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.

age1of2

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ

5.2.8

Weigh

the circular specimen on the analytical balance

to the nearest 0.005 gram. Record this as the disc weight, or

5.3

Calculation

The

resin flow is calculated as follows:

Resin Flow, Percent =

(

− 2W

)

100

Original weight of the specimen

Disc weight of the specimen (cut from the specimen

after pressing)

5.4

Report

The

resin flow, percent, for each specimen

tested and the average of all specimens tested shall be

reported.

6.0 Notes

None

6.1

Other

resins may require different temperature settings

to achieve flow. Pressure may also be dependent on the resin

chemistry. Agreement of temperature and pressure by sup-

plier and user other than as specified should be included in

the report, see 5.4.

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

Subject

Resin

Flow Percent of Prepreg

Date

8/97

Revision

age2of2

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ

Scope

This

test is to measure the flow properties of cast

adhesive freefilms or coverfilms used in the manufacture of

flexible circuitry. The test also provides a measure of the

squeeze out, which might be expected to occur around termi-

nal pads or other boundary spaces.

1.1

Limitations

is not possible to define a universal set of

laminating conditions that suit all of the various adhesive

types. This test is dependent on sample preparation, which is

consistent with good industry practice and in accordance with

the suppliers’ suggested laminating procedures.

Applicable Documents

None

Test Equipment

3.1 Copper foil

Foil

may be treated one side or untreated.

3.2

laminating press in good working order with platen

surfaces of 30.5 cm x 30.5 cm minimum. Platens must be

sufficiently flat and parallel to allow uniform lamination.

3.3

Paper

punches with circular punch sizes of 1.6 mm, 3.2

mm, 4.8 mm, and 6.4 mm.

3.4

suitable instrument for measuring thickness of the

adhesive.

Test Procedure

4.1 Layup for Adhesives Cast on Coverfilms

With

the

release film intact, punch seven graduating holes across the

coverfilm (see Figure 1), then remove release. Alternative

punched hole diameters may be agreed upon between user

and vendor.

4.2

Layup of Freefilm Adhesive

The

freefilm must be

transferred to a suitably thick polyimide or polyester film. This

effectively creates a coverfilm, which may be laid up per 4.1.

A 0.005 mm polyimide film shall be used as a referee in the

event of conflict.

4.3

Lamination

be accomplished by time, temperature,

press pad, and pressure parameters as agreed upon between

supplier and user. A prebake may be used to simulate

extended storage conditions. Prebake conditions must be

agreed upon by supplier and user.

4.4

Evaluation

4.4.1 Squeezeout Characteristics

Measuring

squeeze-

out on specimen punched holes at 90° intervals around the

circumference of the holes; averaging the four readings for

each hole to arrive at an average squeezeout.

Calculation:

average

adhesive

thickness

= microns/micron

5 Notes

5.1

Fill

and squeezeout properties of cast adhesive films are

a complex variable. Different adhesives will exhibit different

abilities to flow. The amount of retained solvent, adhesive

thickness, shelf aging, and substrate thickness will cause the

flow properties to vary within any one adhesive. The uniformity

of lamination, press pad, and thermal excursion is critical in

obtaining test repeatability.

IPC-23171-1

Figure

1 Punched Holes (mm)

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.3.17.1

Subject

Resin

Flow of Adhesive Coated Films and

Unsupported Adhesive Films

Date

5/98

Revision

Originating Task Group

Flex Peel Strength Test Methods Task

Group (D-13A)

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.

age1of1

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ