IPC-TM-650 EN 2022 试验方法.pdf - 第253页

5.4 Evaluation 5.4.1 Calculate the peel strength per mm of width by mea- suring the strip width in mm, using the following formula: 1m m measured strip width in mm x observed pull force = peel strength / mm width 6 Notes…

5.3.2

Place

the keyhole plate over the peel strip with the tab

in the large hole and the strip centered in the slot.

5.3.3

Clamp

the keyhole plate to the base with the paper-

clips, making sure the alignment is not disturbed.

5.3.4

Attach

the hemostat to the tab so the peel will be 90°

to the strip (the hemostat should be attached to the chain with

the adapter and hanging from the tester jaws or force gage so

that the tab can be clamped without excessive bending or

damage).

5.3.5

Start

the vertical pull (5 cm per minute) with the test

head and initiate a chart recorder or visually observe the mini-

mum and pull force.

5.3.6

Lower

the head or force gage to position for starting

the next peel strip and repeat starting at 5.2.1.

IPC-2-4-8-1-2

Figure

2 Keyhold Horizontal Axis

10 cm ±

0.25 cm

(2) .138-32UN-2B

0.025 cm dia.

0.064 cm

± 0.05 cm

10 cm ± 0.25 cm

0.475 cm

± 0.025 cm

0.95 cm ±

0.025 cm

0.064 cm

AL Allo

0.475 cm

± 0.05 cm

0.95 cm ± 0.075 cm

MS 16995

SCR CAP SOC HD

10.5 cm

± 0.075 cm

AA6061 T651

0.475 cm

± 0.025 cm

1.9 cm

± 0.025 cm

0.4 cm

+ 0.013 cm

- 0.0075 cm

dia.

2 holes

0.32 cm thic

AL Alloy

AA6061 T651

IPC-TM-650

Number

2.4.8.1

Subject

Peel

Strength, Metal Foil (Keyhole Method For Thin Laminates)

Date

1/86

Revision

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5.4

Evaluation

5.4.1

Calculate

the peel strength per mm of width by mea-

suring the strip width in mm, using the following formula:

1mm

measured

strip width in mm

x observed pull force =

peel strength/mm width

Notes

6.1

Peel

strength is usually the minimum peel strength

observed.

IPC-2-4-8-1-3

Figure

3 Chain to Hemostat Adapter

IPC-TM-650

Number

2.4.8.1

Subject

Peel

Strength, Metal Foil (Keyhole Method For Thin Laminates)

Date

1/86

Revision

age3of3

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1.0

Scope

The

purpose of this test is to determine the peel

strength of metal cladding to the base laminate while at

elevated temperature; and to evaluate the base laminate

material after the peel strength test is completed for degrada-

tion due to the conditioning.

2.0

Applicable Documents

IPC-TM-650 Test Methods Manual

Method

2.4.8.1, Peel Strength, Metal Foil (Keyhole Method for

Thin Laminates)

Method 5.8.3, Peel Strength Test Pattern

3.0

Test Specimens

3.1 Size and Configuration

Specimens

shall be 50.8 mm

x 50.8 mm [2.0 x 2.0 in] by the thickness of the laminate.

Cladding test strips shall be as specified (see 5.1.2).

3.2

Quantity and Sampling

Unless

otherwise specified,

specimens shall be one lengthwise for each clad side and one

crosswise for each clad side. The outside 25.4 mm [1 in] bor-

der of the parent sheet or panel shall be excluded.

4.0

Apparatus or Material

4.1 Tensile Tester

tensile strength tester equipped with

a load cell, capable of measuring to the nearest 0.0045 kg

[0.01 lbs.] and a light load wire or chain and clamp at least

457 mm [18 in] long (its weight is included in the load cell cal-

culation). The clamp jaws must cover the entire width of each

peel strip tab. Any equipment or apparatus having the

described accuracy, precision, and reproducibility may be

used.

4.2

Hot Fluid Bath

fluid bath or pot capable of maintain-

ing the specified fluid at the specified temperature when mea-

sured 2.54 mm [1.0 in] below the surface.

4.2.1

Dow

Silicone Fluid No. 704, or equivalent.

4.3

Specimen Hold-down

suitable hold-down clamping

system equivalent in performance as that defined in IPC-TM-

650, Method 2.4.8.1.

4.4

Data Collection

For

qualification testing, a recording

system capable of permanent data retention incorporated into

the test apparatus.

4.5 Measuring

device capable of measuring from 0.000 to

12.7 mm [0.500 in] to within ± 0.0025 mm [0.0001 in].

4.6

Etch Resist Materials or Systems

4.6.1

Plater’s

tape, or equivalent, to act as etch resist for

strip formation of the specified widths (see 3.3 and 3.4).

4.6.2

Photoresist

system (printing, developing, and strip-

ping).

4.7

Etching

system capable of complete removal of metallic

cladding.

4.8

Circulating

air oven capable of maintaining 125 ± 2°C

[257 ± 3.6°F].

5.0

Procedure

5.1 Specimen Preparation

5.1.1

Cut

the specimens from the laminate sample. Speci-

mens shall be taken no closer than 2.54 mm [1.0 in] from the

edge of the laminate sheet as manufactured.

5.1.2

Specimens

shall be prepared with at least four resist

strips of 3.18 mm [0.125 in] width and then etched, cleaned

and processed using standard industry practices and equip-

ment. For qualification and referee testing the specimen shall

be photoimaged in accordance with the artwork shown in

Method 5.8.3 of IPC-TM-650 and reproduced here as Figure

1, except that tab ends are optional. Specimens shall be

etched so that the conductor strips on one specimen are in

one direction per Figure 1. Double clad laminate shall have

each side tested using separate specimens. The opposite

side cladding shall be either fully removed or left fully clad.

Separate specimens for both the warp and fill directions are

required for each side. For referee testing the cladding on the

opposite side shall remain.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.4.8.2

Subject

Peel

Strength of Metallic Clad Laminates at

Elevated Temperature (Hot Fluid Method)

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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