IPC-TM-650 EN 2022 试验方法.pdf - 第157页

1 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 …

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

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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.

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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.

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