Zu Produktinformationen springen
1 von 7

PayPal, credit cards. Download editable-PDF and invoice in 1 second!

GB/T 20314-2017 English PDF (GBT20314-2017)

GB/T 20314-2017 English PDF (GBT20314-2017)

Normaler Preis $135.00 USD
Normaler Preis Verkaufspreis $135.00 USD
Sale Ausverkauft
Versand wird beim Checkout berechnet
Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 20314-2017
Historical versions: GB/T 20314-2017
Preview True-PDF (Reload/Scroll if blank)

GB/T 20314-2017: Thin float glass for liquid crystal display (LCD) applications
GB/T 20314-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 81.040.30
Q 34
Replacing 20314-2006
Thin float glass for liquid crystal
display (LCD) applications
ISSUED ON. SEPTEMBER 7, 2017
IMPLEMENTED ON. AUGUST 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Classification ... 6
5 Requirements... 7
6 Test methods ... 9
7 Inspection rules ... 11
8 Packaging, marking, transport and storage ... 14
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 20314-2006, Thin float glass for LCD applications.
Compared with GB/T 20314-2006, the major technical changes are as follows.
-- it changes terms and definitions (see Clause 3; Clause 3 of 2006 edition);
-- it changes classification based on quality grades in the original standard into
classification based on quality requirements (see Clause 4; 4.1 of 2006 edition);
-- it changes thickness classification (see 5.2; 4.3 of 2006 edition);
-- it cancels thick-thin difference classification and changes the indexes of thickness
deviations and thick-thin differences (see 5.2; 5.2 of 2006 edition);
-- it changes the indexes of dimensional deviations and diagonal difference (see 5.1;
5.2 of 2006 edition);
-- it adjusts edge defects to appearance quality requirements (see 5.3; 5.3 of 2006
edition);
-- in appearance quality. it changes the specifications of pane; integrates fog marks
and tin points into point defects; integrates bruises into scratches; and adds lines
(see 5.3; 5.5 of 2006 edition);
-- it cancels micro-waveness grading and changes the indexes of micro-waveness
of thickness 0.55 mm (see 5.4; 5.4 of 2006 edition);
-- it changes the indexes of warp of thickness 0.55 mm (see 5.5; 5.4 of 2006 edition);
-- it changes the test methods for appearance quality, micro-waveness and warp
(see 6.5, 6.6 and 6.7; 6.2, 6.4, 6.6 and 6.7 of 2006 edition);
-- it adds the clause of inspection type and changes the clause of acceptance quality
limits for sampling and some required items (see Clause 7; Clause 7 of 2006
edition);
-- it deletes Annex A (see Annex A to 2006 edition).
This Standard was proposed by China Building Materials Federation.
This Standard shall be under the jurisdiction of National Technical Committee 447 on
Industrial Glass and Special Glass of Standardization Administration of China (SAC/TC
447).
Thin float glass for liquid crystal
display (LCD) applications
1 Scope
This Standard specifies the terms and definitions, classification, requirements, test
methods, inspection rules, packaging, marking, transport and storage of thin float glass
for liquid crystal display (LCD) applications.
This Standard applies to soda-lime-silica thin float glass for TN-LCD and STN-LCD
with the thickness not greater than 1.10 mm.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this document.
GB/T 1216, External micrometer
GB/T 2680, Determination of light transmittance, solar direct transmittance, total
solar energy transmittance and ultraviolet transmittance for glass in building and
related glazing factors
GB/T 2828.1-2012, Sampling procedures for inspection by attributes – Part 1.
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
GB/T 9056, Metal ruler
GB 11614-2009, Flat glass
GB/T 15764, Standard terminology of flat glass
GB/T 18680-2002, The transparent conductive glass with indium-tin oxide films
used in liquid crystal display
JB/T 2369, Reading microscope
SJ/T 10793, Terms for glass used in electronic applications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply, in addition
to those defined in GB 11614-2009, GB/T 15764, GB/T 18680-2002 and SJ/T 10793.
3.1
TN-LCD
Liquid crystal display of the twisted nematic type.
3.2
STN-LCD
Liquid crystal display of the super-twisted nematic type.
3.3
edge defects
Cracks, bulges, missing parts, etc. of glass pane, including chips, edge irregularities,
missing angles and so on.
3.4
micro-waveness
Degree of tiny unevenness of glass pane.
3.5
warp
Misfit between glass surface and reference plane, which is expressed as degree of
warp.
4 Classification
Classified into grades A and B in accordance with the quality requirements.
Light transmittance of thin float glass for LCD applications shall not be less than 91%.
6 Test methods
6.1 Dimensional deviation
As specified in 6.1 of GB 11614-2009.
6.2 Diagonal difference
Measure the length of two diagonal lines as specified in 6.2 of GB 11614-2009. The
percentage of the difference of diagonal line lengths to the average length of diagonal
lines is the diagonal difference.
6.3 Thickness deviation
Use an external micrometer of division value 0.001 mm as specified in GB/T 1216 to
measure 5 points in the direction perpendicular to the stretching direction of glass pane,
including one point inwards about 15 mm from the edge respectively and three points
equally dividing the distance between the two points. Round the measure values off to
the third decimal place. The difference between actual value and nominal thickness is
the thickness deviation.
6.4 Thick-thin difference
Use the same method specified in 6.3 to measure the thicknesses of 5 different points
of a glass pane; calculate the difference between its maximum value and minimum
value.
6.5 Appearance quality
6.5.1 Point defects, intensity of point defects, scratches, optical spot distortions, lines,
surface cracks and surface stains
6.5.1.1 After washing and drying, transfer sample to a dark room of 100,000 grade’s
cleanliness. The light intensity of the test point is 2,500 lx; the distances from the light
source and the observing position are 300 mm respectively; observe sample at any
random angle against the matt black-white background, through reflected light [as
shown in Figure 1a)] and transmission light [as shown in Figure 1b)].
6.5.1.2 On an ambient light detector, 300 mm apart from the test point, observe sample
at any random angle.
6.5.1.3 Use a microscope of division value 0.001 mm as specified in JB/T 2369 to
measure the maximum dimensions of point defects and the widths of scratches. Use
a metal ruler of division value 1 mm as specified in GB/T 9056 to measure the minimum
7.2.4.2 Batch criteria
7.2.4.2.1 During the inspection of appearance quality, refer to the sample quantities in
Table 5; if the rejected quantity of pieces is less than the rejected quantities in Table 5,
then the batch of product is acceptable for the item.
7.2.4.2.2 During the inspection of dimensional deviation, diagonal difference, thickness
deviation, thick-thin difference, micro-waveness and warp, if the results comply with
the requirements of cor...
Vollständige Details anzeigen