GB/T 4852-2002 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 4852-2002 | English | 70 |
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Test method for tack of pressure sensitive adhesive tapes by rolling ball
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| GB/T 4852-1984 | English | 199 |
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Test method for tack of pressure sensitive adhesive tapes (method of oblique plane by rolling ball)
| Obsolete |
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GB/T 4852-2002: Test method for tack of pressure sensitive adhesive tapes by rolling ball---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4852-2002
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.180
G 38
Replacing GB/T 4852-1984
Test method for tack of pressure sensitive
adhesive tapes by rolling ball
Issued on. MAY 29, 2002
Implemented on. DECEMBER 01, 2002
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Definition... 5
4 Principles... 5
5 Test conditions... 5
6 Test piece... 6
7 Method A -- Bevel rolling ball method... 6
8 Method B -- Chute rolling ball method... 9
9 Test report... 10
Foreword
This standard equivalently uses the part 12 “Test for tack by inclined rolling ball”
in JIS Z 0237.1991 “Test method for pressure-sensitive adhesive tapes and
adhesive sheets” as well as the part 4 of the reference part “Test method of tack
by rolling ball”.
The main technical differences between this standard and part 12 of JIS Z
0237.1991 are as follows.
There are only 29 kinds of steel balls for testing in this standard, which is lack
of two steel balls which have nominal diameters of 21.431 mm and 24.606 mm
as compared with the steel balls as specified in the part 12 of JIS Z 0237.1991.
This is because there are no such two sizes of steel balls in the steel ball series
for rolling bearings in China.
The main technical differences between this standard and the pre-revised
standards are.
(1) ADD the method B. Chute rolling ball method. Therefore, the name of this
standard is changed from the “Test method for tack of pressure sensitive
adhesive tapes by bevel rolling ball” to the “Test method for tack of
pressure sensitive adhesive tapes by rolling ball”.
(2) The angle of the inclined plate in the method A is generally specified as
30°, and in special cases, 20° or 40°. However, the standard before
revision does not clearly specify the angle of inclination plate in special
cases.
(3) The number of rolling balls in the method A is 33 before the revision and
29 after the revision.
This standard shall, from the date of implementation, replace GB/T 4852-1984.
This standard was proposed by the China Petroleum and Chemical Industry
Association.
This standard shall be under the jurisdiction of the National Adhesive
Standardization Technical Committee.
The responsible drafting organization of this standard. Shanghai Rubber
Products Research Institute.
The main drafter of this standard. Zhang Wengang.
This standard was first published in 1984.
For this standard, the National Adhesive Standardization Technical Committee
is responsible for its interpretation.
Test method for tack of pressure sensitive
adhesive tapes by rolling ball
1 Scope
The standard of this method applies to the test of the tack of pressure sensitive
adhesive tapes and those products similar to pressure sensitive adhesive tapes.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 308-1989 Rolling bearing - Steel ball
3 Definition
This standard uses the following definition.
4 Principles
Roll a steel ball over the adhesive surface of the adhesive tape that is placed
flat on the inclined surface.
5 Test conditions
5.1 Unless otherwise specified, the laboratory temperature is 23 °C ± 2 °C and
the relative temperature is 50% ± 10%.
6 Test piece
For the adhesive tape which has greater elongation, after sampling, it shall be
placed until the elongation is basically restored before testing.
6.1 Test piece for method A
The size of test piece. Width (10 ~ 80) mm, length more than 250 mm.
6.2 Test piece for method B
The size of test piece. Width 25 mm, length more than 100 mm.
7 Method A -- Bevel rolling ball method
7.1 Test device
7.1.1 The bevel ball rolling device consists of inclined plates that can be inclined
at 20°, 30°, 40° and their coupling structures, as shown in Figure 1.The parts
are as follows.
7.1.1.1 Inclined plate
The inclined plate is made of a smooth hard flat plate (glass plate, metal plate,
wood board, plastic plate, etc.).
7.1.1.2 Rolling-aid section
The rolling-aid section is made of a transparent polyester film which has a
length of more than 100 mm a thickness of about 25 μm, which is attached to
the test piece at a predetermined position. The length of rolling-aid section is
100 mm.
7.1.2 Rolling ball. It shall use the rolling ball of the following specifications.
7.1.2.1 Material. It is made of GCr15 bearing steel. The accuracy of the steel
ball’s shape tolerance and surface roughness shall be above the grade-40 as
specified in GB/T 308.
7.2 Test methods
7.2.1 Use a level to fix the rolling ball device horizontally on the test bench. The
inclined surface is taken at a standard angle of 30°, or otherwise 20° or 40° if
necessary.
7.2.3 In order to keep the length of the rolling-aid section constant at 100 mm,
according to the size of the ball, as shown in Figure 1, adjust the center of the
ball to the starting position of the ball.
7.2.4 Us tweezers to remove the ball which is stored in the rust inhibitor. Use
the cleaning method of test rolling ball as described in 7.2.5 to clean it. After
washing it clean, place it at the starting position. Allow the ball to roll down the
rolling-aid section.
7.2.5 Cleaning of test rolling ball. Use absorbent gauze 1) to dip solvent 2) to
wipe it. After the surface is dry, use a new cleaning gauze to dip solvent to scrub
it repeatedly for more than 3 times, until it is considered clean in visual
inspection.
7.2.7 Formal test
Take 3 specimens. Use the steel ball of the largest number to carry out one
rolling ball test, respectively. If a specimen cannot adhere to the steel ball, it
may be replaced with a ball which has the number smaller than it to carry out
one test.
7.3 Test results
The test results are expressed as the median (ball number) of the steel ball
number of the rolling ball test results of 3 specimens during formal test.
8 Method B -- Chute rolling ball method
8.1 Test device
8.1.1 The structure of the chute rolling ball device is as shown in Figure 2.The
tilt angle is 21°30'.
8.1.2 Rolling ball
8.2 Test methods
8.2.1 Before the test, according to the method described in 7.2.5, clean the
chute and steel ball in the test device. Do not touch them from then on.
8.2.2 Use adhesive tape and so on to fix the test piece on a hard horizontal flat
test plate (glass plate, metal plate, wood board, plastic plate, etc.). When fixing
the test piece, do not allow the test piece to bulge, wrinkle, or warp. When the
edge of test piece is warped or bulged, use another adhesive tape to fix this
part on the test plate.
8.3 Test results
The test results are expressed as the arithmetic mean of the rolling distance
the ball in the 3 test pieces.
9 Test report
The test report includes the following contents.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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