IPC-TM-650 EN 2022 试验方法.pdf - 第280页

1 Scope This method covers the determination of the force required to initiate tearing in flexible insulating materials. It is based on ASTM D1004. 2 Applicable Documents ASTM D374 Standard Test Methods for Thickness of …

1.0

Scope

test method for measuring the geometric

irregularities (roughness, waviness, etc.) of the surface of

metal foils.

2.0

Applicable Documents

None

3.0

Test Specimen

Any

sample of metal foil to be tested.

Care must be taken to insure that there are no wrinkles or

kinks in the sample.

4.0

Apparatus

4.1

Amplimeter,

with range selector for measuring surface

roughness in micro inches.

4.2

Pilotor

(electric) used to operate the tracer.

4.3

Tracer,

for tracing and detecting surface irregularities.

4.4

Controlled

Roughness Specimen

4.5

Surface

Plate

5.0

Procedure

5.1 Test

5.1.1

Place

the amplimeter on a rigid support such as a

work bench, stand, or machine table with space beside it for

the pilotor that will be used.

Note:

not connect the amplimeter to a power line supply-

ing heavy induction equipment such as induction furnaces,

welders and induction motors. The starting and stopping of

such equipment will cause fluctuations in the AC line voltage

which may result in erroneous roughness readings.

5.1.2

Set

the AA/RMS selector switch at AA (for arithmetical

average), and turn on amplimeter.

5.1.3

Check

setup for minimum vibration.

1. Position the tracer with an appropriate skidmount in place

on the work surface. Do not try to use the tracer without a

skidmount.

2. With the tracer stationary and the pilotor cable discon-

nected read the amplimeter digital display. If the reading is

higher than the work allows, move the setup to a steadier

support and repeat the check.

3. The displayed reading should not be greater than 10% of

the roughness to be measured.

5.1.4

Set

the roughness-width cutoff at 0.030 inch.

5.1.5

Set

the ‘‘Range’’ selector switch.

5.1.6

Set

the pilotor stroke length between 1 in. and 1.5 in.

5.1.7

make sure that the equipment in paragraph 4.0 is

operating properly, take a reading of the rated roughness

specimen.

Note:

The

controlled roughness specimen must be thoroughly

cleaned before it is used. A dirty specimen will give erroneous

readings.

5.1.8

erroneous display readings are obtained, check the

following conditions:

1. Amplimeter is turned on.

2. Tracer is connected to the amplimeter with all connections

tight.

3. Tracer is moving over the work.

4. Tracer point is in contact with the work.

5. Check the tracer cable for wear and for open or short cir-

cuits.

6. Check for a blown fuse in the amplimeter.

5.2

Evaluation

Record

roughness readings in micro inches

using Arithmetical Average (AA). A minimum of 3 areas per

sample should be taken for determining the surface rough-

ness.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.15

Subject

Surface

Finish, Metal Foil

Date

3/76

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.

age1of1

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1 Scope This method covers the determination of the force

required to initiate tearing in flexible insulating materials. It is

based on ASTM D1004.

2 Applicable Documents

ASTM D374

Standard Test Methods for Thickness of Solid

Electrical Insulation

ASTM D1004 Standard Test Method for Tear Resistance

(Graves Tear) of Plastic Film and Sheeting

3 Test Specimens

3.1

The specimens shall be prepared using flexible dielec-

tric material. If the flexible dielectric is clad, the copper foil

shall be etched using standard commercial practices.

3.2 Ten specimens, five in the transverse and five in the lon-

gitudinal (machine) directions, shall be cut from the sample

material.

3.3 The test specimens shall conform to the dimensions

shown in Figure 1.

4 Test Equipment

4.1 Testing Machines

A power driven machine of either of

the two following types shall be used.

4.1.1 Static Weighing Constant rate of grip separation

type, negligible movement of the upper jaw.

4.1.2 Pendulum Weighing Constant rate of grip motion

type, constant rate of lower jaw movement, variable upper jaw

movement. Either maximum load indicating devices or record-

ers are permissible in the testing machine. The applied load,

as indicated by a recorder, dial or scale, shall be accurate to

within 12 percent. If an indicating device is used, the indicator

shall remain at the point of maximum load after rupture of the

test specimen.

4.2 Grips A gripping system that minimizes both slippage

and uneven stress distribution on the specimen shall be

used.

4.3 Thickness Measuring Devices Suitable calibrated

ratchet/friction thimble machinist’s micrometer reading to

0.0025 mm [0.0001 in] or less shall be used for measuring

the thickness of the specimens. The micrometer shall con-

form to ASTM D374.

4.4 Die A die having the dimensions shown in Figure 1

shall be used to cut all specimens. The 90° angle shall be

honed sharp with no radius or have a minimum practical

radius, as per ASTM D1004. The cutting edge of the die shall

have a 5° negative rake, and shall be kept sharp and free

from nicks to avoid leaving ragged edges on the specimen.

Cutting may be facilitated by wetting the surface of the sample

and cutting edges of the die with water. The sample shall rest

on a smooth, slightly yielding surface that will not injure the die

blade. Lightweight cardboard or a piece of leather belting is

suitable. Care should be taken that the cut edges of the speci-

men are perpendicular to its other surfaces and that the

edges have a minimum of concavity. NOTE: The test speci-

men results depend on the quality of the die used.

IPC-2416-1

Figure 1 Die for Tear Test Specimen

101.60mm

26.95mm (x2)

25.40mm radius (x2)

Dimensional tolerances ±0.051mm [0.002 in]

Table of Metric-to-Imperial Equivalents

in.

4.0

0.750

1.061

1.000

1.118

2.0

0.500

101.60

19.05

26.95

25.40

28.40

50.80

12.70

28.40mm (x2)

50.80mm (x2)

19.05mm (x2)

19.05mm

radius (x2)

12.70mm radius (x2)

90º±0.5º

3000 Lakeside Drive, Suite 309S

Bannockburn, IL 60015-1249

IPC-TM-650

TEST METHODS MANUAL

Number

2.4.16

Subject

Initiation Tear Strength, Flexible Insulating

Materials

Date

03/14

Revision

Originating Task Group

Flexible Circuits Test Methods Subcommittee

(D-15)

Material in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.

Page1of2

5 Conditioning

5.1 Conditioning

The test specimens shall be conditioned

at23°C±2°C(73.4 °F ± 3.6 °F) and 50% ± 5% relative

humidity for not less than 24 hours prior to test.

5.2 Test Conditions Conduct tests in the Standard Labo-

ratory Atmosphere of 23 °C±2°C(73.4 °F ± 3.6 °F) and 50

± 10 percent relative humidity.

6 Speed of Testing A jaw separation of 25.4 mm [1 in]

shall be used. The rate of travel of the power activated grip

shall be 51 mm [2 in]/minute and shall be uniform at all

times.

7 Procedure

7.1

Measure the thickness of the specimen at several points

to the accuracy limits of the measuring devices specified in

4.3. Record the average thickness in millimeters or microns

[in].

7.2 Place the specimen in the grips of the testing machine

so that the long axes of the enlarged ends of the specimen

are in line with the points of attachment of the grips to the

machine.

7.3 Apply the load at 51 mm [2 in]/minute rate of grip sepa-

ration. After complete rupture of the specimen, the maximum

tearing load in grams [ounces] shall be noted from the dial

scale or recorder chart and recorded. Data from specimens

which break at some obvious flaw or which break in or at the

edges of the grips shall be discarded and retests made.

8 Calculation The average resistance to tearing shall be

calculated from five specimens tested in each principal direc-

tion of orientation. Data shall be recorded as grams [ounces]

of tearing resistance.

9 Report

9.1

Report the average thickness of all specimens.

9.2 Report the average transverse and the average longitu-

dinal initiation tear strength values.

IPC-TM-650

Number

2.4.16

Subject

Initiation Tear Strength, Flexible Insulating Materials

Date

03/14

Revision

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