IPC-TM-650 EN 2022 试验方法.pdf - 第65页

1.0 Scope This method is designed to determine thread count of woven glass fabric used for prepreg (resin- impregnated glass fabric, or B-stage). It is applicable for glass fabric inspection before and after impregnation…

1.0

Scope

This

method is designed to determine the

weight of a fabric by use of a small specimen. It is appropriate

for woven or nonwoven fabrics made with glass or other inor-

ganic yarns, or made with organic fibers or yarns.

2.0

Applicable Documents

None

3.0

Test Specimens

3.1 Test Specimen Configuration

Unless

otherwise

specified, the specimen shall consist of at least 2 pieces of

fabric with a maximum size of 127 x 178 mm [5.0 x 7.0 in] and

a minimum of 98 x 98 mm [3.88 x 3.88 in]. The total area shall

be greater than 29,000 sq mm [45 sq. in]. For example, three

pcs. of 102 x 102 mm [4 x 4 in] with a total area of 30,968 sq

mm [48 sq. in].

3.2

Quantity and Sampling

Specimens

shall be taken

from the fabric roll (as supplied by the manufacturer) no closer

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

of the width of the roll. Unless otherwise specified, three

specimens shall be taken from the roll at randomly selected

locations.

4.0

Apparatus or Material

4.1

analytical balance capable of weighing to 0.001 gm.

4.2

Cutting Equipment

punch die or steel rule die

capable of cutting the specimens to a size per 3.1 and to

within 0.38 mm [0.015 in]. Alternately a razor blade knife, or

equivalent, plus a caliper, or equivalent measuring device, may

be used provided the precision requirement is met and the

fabric edges are cleanly cut.

5.0

Procedure

5.1

Prepare a specimen by cutting the specified pieces in

accordance with 3.0. Carefully handle the pieces to prevent

loss of yarns or fibers from the cut edges. When applicable,

the edges shall be cut on a bias to the orientation of the fab-

ric. If not using a die, measure the specimen dimensions to

the nearest 0.38 mm [0.015 in].

5.2

Determine

the weight of the specimen to within 0.1% on

the balance. (Note: care must be taken so that any loose

yarns unraveling from the cut are also weighed with the speci-

men.)

5.3

Evaluation

Calculate

the weight in grams per square

meter [ounces per square yard] as follows:

GSM = G

[

OSY

= 45.72 G

]

GSM

[OSY] = Grams per square meter [ounces per square

yard]

G = Total weight of specimen in grams [ounces]

A = Total area of specimens in square meter [square inches]

5.4

Report

the individual specimen weights and the

average of all specimens tested. Report the specimen size

and number of pieces per specimen.

6.0 Notes

None

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.1.6.1

(renumbered from 2.3.12)

Subject

Weight of Fabric Reinforcements

Date

12/94

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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1.0

Scope

This

method is designed to determine thread

count of woven glass fabric used for prepreg (resin-

impregnated glass fabric, or B-stage). It is applicable for glass

fabric inspection before and after impregnation.

2.0

Applicable Documents

None

3.0

Test Specimens

Unless

otherwise specified, three

specimens cut to the size convenient to performing the test,

with a minimum of 101.6 x 101.6 mm [4.0 x 4.0 in], shall be

cut from random locations in a roll or one each from three

sample sheets. The warp and fill directions of the fabric shall

be noted.

4.0

Apparatus or Material

4.1 Muffle furnace

muffle furnace that is capable of

maintaining 550 ±50°C [1022 ±90°F].

4.2

Magnifier

and counting device. Type and model to be

determined, or equivalent.

4.3

Gingher

Thread Counter, Model G4, or equivalent.

5.0

Procedure

5.1 Method A: Thread Count by Picks per Inch Method

5.1.1

For

prepreg, place specimens in a muffle furnace at

550 ±50°C [1022 ±90°F] for a minimum of 15 minutes or until

sufficient resin is burned away to be able to clearly see the

yarns of the fabric. After removing the specimens from the

muffle furnace, allow to cool to room temperature on a flat

surface to prevent distortion of the fabric.

5.1.2

Place

the specimen as flat as possible, without ten-

sion, on a smooth horizontal surface. Use the magnifier and

measuring device to count the yarns within a specific dis-

tance, 25.4 mm [1.0 in] minimum, in each direction of the

cloth.

5.2

Method B: Thread Count by Gingher Thread

Counter Method

5.2.1

Lay

the Gingher comparator parallel along one grain

direction to be counted. Rotate the comparator back and

forth out of parallel with the grain by 10 to 15 degrees until an

optical parabola is observed. The apex of the parabola is tan-

gent to the thread count per inch.

5.2.2

Repeat

5.2.1 for the other (othogonal) direction of the

cloth yarns.

5.3

any discrepancies or disagreement between test data

is found, Method 5.1 shall be the referee method.

5.4

Report

Average

the number of yarns for each direction.

Report the individual readings and average results.

6.0 Notes

6.1

Summary

The

following details should be specified in

the applicable performance specification or product procure-

ment specification.

a. Test Method to be used (see 5.1, and 5.2).

b. Specimen size and number to be tested, if other than

specified (see 3.0).

c. Where applicable, any additions or modifications to the

specified procedure and criteria.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.1.7

Subject

Thread

Count of Glass Fabric

Date

12/94

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.

age1of1

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Scope

This

method is used to determine warp and fill

thread count in materials containing combustible fibers.

Applicable Documents

None

Test Specimen

The

specimen may be of any convenient

size greater than 51 mm x 51 mm.

Equipment

4.1

Glass

pick, ruler, pointer or other suitable form of count-

ing device

4.2

Microscope

Procedure

5.1 Yarn Warp

Place

the sample as flat as possible, with-

out tension on a smooth horizontal surface. The actual num-

ber of warp yarns shall be counted in 25 mm of cloth width.

5.2

Yarn Filling

The

number of yarns per 25 mm in the fill-

ing direction shall be determined as in 5.1.

5.3

Evaluation of Test

When

the warp direction is known,

report the number of yarns per 25 mm as ‘‘A x B,‘‘ where A

and B are the number of warp and fill yarns per 25 mm

respectively. When the warp direction is not known, report the

number of yarns per 25 mm as ‘‘A:B,‘‘ where A is the number

of yarns per 25 mm in either direction and B is the number of

yarns in the perpendicular direction.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.1.7.1

Subject

Thread

Count, Organic Fibers

Date

12/87

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

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ