GB/T 4852-2002 PDF in English
GB/T 4852-2002 (GB/T4852-2002, GBT 4852-2002, GBT4852-2002)
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| 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)
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GB/T 4852-2002: PDF in English (GBT 4852-2002) GB/T 4852-2002
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:
Tack
When the object and the adhesive surface of the pressure-sensitive
adhesive tape are in short contact with a slight pressure, the adhesion of the
adhesive tape to the object is called tack.
4 Principles
Roll a steel ball over the adhesive surface of the adhesive tape that is placed
flat on the inclined surface. According to the maximum size of steel ball which
can be adhered by the specified length of adhesive surface, evaluate its tack.
Or otherwise roll a steel ball of specified size along the chute, to measure the
distance at which it is rolled on the adhesive surface of the adhesive tape on
the horizontal plate, thereby evaluating its tack.
5 Test conditions
5.1 Unless otherwise specified, the laboratory temperature is 23 °C ± 2 °C and
the relative temperature is 50% ± 10%.
5.2 Before preparing the specimen, the adhesive tape shall be removed from
the packaging material and placed under the condition of 5.1 for more than 2 h
without overlap.
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.
Number of test pieces: Not less than 4 pieces.
6.2 Test piece for method B
The size of test piece: Width 25 mm, length more than 100 mm.
Number of test pieces: Not less than 3 pieces.
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:
Figure 1 -- Test device of tack (bevel rolling rolling device)
Marking Marking
Rolling ball
Rolling-aid section
Adhesive surface
(measurement section)
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.
7.1.1.3 Measurement section
The measurement section is an adhesive surface which has a length of 100
mm from the lower end of the rolling-aid section.
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.
7.1.2.2 The number of the rolling ball and the corresponding nominal diameter
are as shown in Table 1.
Table 1 -- Number of the ball and corresponding nominal diameter, mm
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.
7.2.2 At the lower end of the test piece, respectively use positioning adhesive
tape or weight (mass of about 500 g) to fix the test piece to a specified position,
allowing the adhesive surface to face upwards. In the rolling-aid section, attach
the polyester film to the specified position of the adhesive surface. When
applying the polyester film, it shall avoid air bubble inclusion or wrinkling, it shall
avoid applying high pressure. When fixing the test piece, pay attention to
avoiding it from warping or bulging. If bulging occurs at the edge, it shall use
Ball number
Nominal
diameter
Ball number
Nominal
diameter
other adhesive tapes to fix this part onto the bevel.
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.
Note:
1) A fabric such as gauze or non-woven fabric that has no short fibers dropped
during scrubbing, which does not contain a solvent-soluble substance.
2) Solvent of reagent grades such as naphthenes, miscella, alcohol, isopropanol,
toluene, or industrial grade solvents without residues.
7.2.6 Preselection of the largest steel ball
Adjust the starting position. Use a ball of different sizes. Repeat cleaning and
rolling the ball and other operations. From the balls which stop within the
measurement section (the ball does not move for more than 5 s), pick the
largest one. Take the largest ball as found from the same test piece as well as
another two balls whose number is adjacent to it. Perform one test on the same
specimen, to determine the steel ball of the maximum number. Before picking
the largest ball, it is possible to roll them for several times on the same test
piece. However, it shall not be used as the formal test data for processing.
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. If it still cannot be adhered, it shall follow the steps of 7.2.6 ~ 7.2.7 to
repeat the 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
8.1.2.1 The material is as specified in 7.1.2.1.
8.1.2.2 The size of the rolling ball is in accordance with 7.1.2.2. Use a steel ball
which has a number of 14.
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.
8.2.3 As shown in Figure 2, horizontally fix the chute rolling ball device to the
test bench on which the test piece is mounted.
8.2.4 Place the rolling ball at the specified starting position. Operate the lever
to roll the ball down. Measure the rolling distance the ball. This distance refers
to the length between the end of the chute and the center point of contact
between the adhesive surface and the ball when it stops rolling, as shown in
Figure 2.
8.3 Test results
The test results are expressed as the arithmetic mean of the rolling distance
the ball in the 3 test pieces.
Figure 2 -- Test device for chute rolling ball
9 Test report
The test report includes the following contents:
a) The number, name and test method used of this standard;
b) The inclination angle of the tilt plate;
c) The description of the test adhesive tape, including type, source, number
of sample adhesive tape rolls, manufacturer's name, designation,
specification, batch number, batch size, etc.;
d) Test results;
e) Others.
Parallel at this two sides
The surfaces M and N are parallel
Horizontal bubble Start-up button ON/OFF device
Chute
Distance from the end of
chute to the centre of ball
Rolling ball
Test piece
Adhesive tape for fixation
__________ END __________
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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