IPC-TM-650 EN 2022 试验方法.pdf - 第66页

1 Scope This method is used to determine warp and fill thread count in materials containing combustible fibers. 2 Applicable Documents None 3 Test Specimen The specimen may be of any convenient size greater than 51 mm x …

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.

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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

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1.0

Scope

1.1

This method describes the procedure required to exam-

ine materials and/or finished product for workmanship, which

is the general quality of the goods other than as specified by

the applicable standard.

2.0

Applicable Documents

3.0 Test Specimens

3.1

Any

piece of a lot is subject to examination. Generally,

those specimens prepared for inspection and/or testing for

specific properties may be used to determine workmanship.

4.0

Apparatus or Material

4.1

Referee

optical device - 10X magnification.

5.0

Procedure

5.1 Evaluation

5.1.1

any stage of product handling, sample preparation,

or specimen conditioning, the product shall be under scrutiny

for detection of any defects, flaws, or unusual characteristics

other than those specifically called out in the applicable speci-

fication, using unaided or corrected 20/20 vision.

5.1.2 In

the case of a questionable evaluation with 20/20

vision, a referee inspection shall be made using the 10X mag-

nification.

5.2

Record and Report

5.2.1

Each

incidence of suspect flaw or defect shall be

noted and documented. The authorized quality function shall

determine whether the reliability, serviceability, or functionality

of the product may be affected.

5.2.2

Record

and report findings, including photographs of

defect, if deemed necessary.

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

2.1.8

Subject

Workmanship

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

电子技术应用　　　　　　　ｗｗｗ．ＣｈｉｎａＡＥＴ．ｃｏｍ