GB 28231-2011General provisions of safety and health for writing boards (English PDF)

Foreword

4.9 of this standard are mandatory, others are recommended. This standard was drafted in accordance with GB/T 1.1-2009 given rules. Please note that some of the content of this document may involve patents. Release mechanism of the present document does not assume responsibility for the identification of these patents. This standard is proposed and administered by the People's Republic of China Ministry of Health. This standard by the People's Republic of China Ministry of Health is responsible for interpretation. This standard was drafted. Ministry of Education Graduate Institute of Teaching instrument. The main drafters of this standard. Liu Jichang, Sunzhen Qi, Ma Qiang. Writing board health and safety requirements

1 Scope

GB 28231-2011 is the Chinese national standard on general provisions of safety and health for writing boards, in the field of environment and health protection, safety. It carries no /T suffix, which in the Chinese system means compliance is mandatory: a product or a practice within its scope has to meet it to be lawfully made, sold or carried out in China. It was issued on 30 December 2011 by the Ministry of Health of the People's Republic of China; Standardization Administration of China, and has been in force since 1 May 2012. Classification: ICS 13.100, CCS C56. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This standard specifies the teaching writing board (chalkboards and whiteboards) health and safety requirements, tablet appearance quality, structure, classification, installation, Signs, brochures and test methods. This standard applies to all types of schools at all levels tablet used in ordinary classrooms, laboratories and other specialized classrooms. Other teaching activities And communication, notes, publicity, writing board can be used with reference to use. This standard does not apply to notices and electronic memory transmission display writing board. This standard does not involve the electrical control of the tablet, the content may refer to the appropriate electrical safety requirements.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 250 textile color fastness test assessing change in color like the gray card

GB/T 730 Textiles Tests for color fastness Blue wool standards (1-7) level of quality control

GB/T 1710-2008 similar coloring pigment light fastness Methods of measurement

GB/T 3979-2008 object colors

GB 5296.1 General consumer use GB/T 5698 color terms

GB/T 6749-1997 Film color representation

GB/T 9761-2008 Paints and varnishes - Visual comparison of the color

GB/T 15608 Chinese color system

GB/T 16422.2-1999 Plastics - Methods of exposure to laboratory light sources - Part 2. Xenon arc lamp

GB/T 17657-1999 panels and veneer plywood physical and chemical performance test method QB/T 2859 whiteboard marker

3 Terms and Definitions

GB/T 5698 defined by the following terms and definitions apply to this document.

3.1 Chalk board chalkboard After writing with chalk, you can wipe the board, and with the backing, a support such as a fixed frame structure.

3.2 Whiteboard whiteboard After whiteboard pen, can wipe light colored board, with backing, a support such as a fixed frame structure.

3.3 Writing surface writingsurface For writing, viewing the surface which wipes and used repeatedly.

3.4 Writing panel writingpanel In the writing pad, the function has a written part.

3.5 Liner liningboard Close to the writing on the back panel, set off from the support, silencers, shock effect of the plate.

3.6 Backplane rearboard In the single-sided tablet used to protect the lining of the board.

3.7 Writing plate frame boardframe Directly connected with the writing panel and lining the four sides and with the support of the combined structure.

3.8 Fixed tablet fixedboard The body of the tablet or tablet (slide, etc.) fixed to the writing on the wall plate. (See Appendix A)

3.9 Mobile tablet mobileboard You can move from one floor to another in the writing pad. (See Appendix A)

3.10 Sliding tablet slidingboard Writing can be performed parallel slide plate in a horizontal or vertical direction. (See Appendix A)

3.11 Rotary tablet pivotingboard Mounted on a horizontal or vertical axis, can be pivoting writing board. (See Appendix A)

3.12 Fan-type writing board wingedboard Writing consists of a main board and one or more fan board assembly from the writing pad. (See Appendix A)

3.13 Fan plate wing Having both positive and negative writing surface writing board, by a hinge connection, you can rotate around a vertical direction.

4 Requirements

4.1.1 Color chalk board Color chalk board by B.1 method for the determination should be. writing surface is achromatic who lightness (V) should N3/or less; the writing surface to have color Color, its hue (H) as GB/T in 15608 7.5GY-5BG, lightness (V) of

2.5 to 4.0, and chroma (C) is

4.1.2 white color White color determined by the method according to Appendix B.1 lightness (V) should N8.5/or more.

5 Writing plate appearance quality

5.1 writing surface should be smooth surface, no ripples, cracks, pinholes, defects such as scars and uneven.

5.2 splicing plane writing panel, with a vernier caliper, joint gap should be less than 1mm, height difference on both sides of the seam should not exceed Over 1mm.

5.3 writing surface color should be uniform.

5.4 All board for writing a positive framework, parts, accessories, etc. should have decorative protective layer. Tone should be writing pad protective layer There are significant differences, no glare.

6 Writing board structure

6.1 Writing panels and linings, solid back should be affixed adhesive or compacted firm, not to use nails reinforcement, should not have any metal exposed book Writing surface.

6.2 Writing a clamping frame should play the role of compaction writing panel, lining and backplane, not loose.

6.3 Writing panel body should have a moisture resistant, not because of changes in air humidity and warping, mildew, condensation, rust.

6.4 In addition to portable chalk boards, the board should have a variety of other chalk chalk groove. The width of the groove should make chalk chalk is not spilling out, may Removable chalk groove should be a reliable fixation.

6.5 parts mounted on the body of the tablet, accessories such as hooks, flipchart clip, lighting, lamp holder, pen tray and so should not be blocked and impede the writing surface Writing on the job.

6.6 tablet is exposed to the outside edges and corners should be rounded or chamfered, burr-free, with a vernier caliper edges should have no less than R5mm fillet. Weld metal should be polished smooth. End face of the hollow member should be protected or enclosed.

6.7 In the absence of tool conditions, including a detachable portion of the end surface protection member and garnish not be removed.

6.8 Writing on the sliding plate tracks any member can not be removed without any reason, to ensure reliable transmission connections shall be positioned writing board; assurance During the sliding smooth and reliable connection.

6.9 Sliding tablet sliding distance during any relative movement between the moving parts with a vernier caliper measurements should be less than 8mm Or greater than the safe distance of 25mm.

6.10 In normal use, the tablet's weight apparatus can not easily be met, should not lead to unintentional misuse. Should anti Hotels Weight loss measures and safety guards.

6.11 under the conditions of ambient noise of less than 45dB, with the A-weighted sound level meter, from the writing pad 1m tested during the sliding noise can not be More than 65dB.

6.12 mobile tablet moves should not slip loose after place to ensure the smooth. In use should not be shaking, friction should not be sharp sound. Equipped with a small wheel mobile writing board, should the wheel locking device.

6.13 shaft rotary tablet should be firm, to ensure a reliable connection with writing pad holder. Strength

6.14 touch tablet hinge plate gravity shall meet the requirements of the fan, fan to ensure reliable connection board and the motherboard.

Appendix A

(Informative) Writing Pad icon named Figure A.1 Fixed whiteboard Figure A.2 single-leaf plate fixed writing boards Figure A.3 double-leaf plate fixed writing boards

a) the upper and lower sliding

b) sliding around Figure A.4 sliding fixed writing boards

a) a vertical rotary

b) horizontal rotary Figure A.5 rotary movable writing board

a) the upper and lower sliding

b) sliding around Figure A.6 slide type movable writing board

Appendix B

(Normative) experiment method Test Method B.1 color B.1.1 visual colorimetric. According to GB/T 15608 require the use of Chinese color system Munsell color sample book or atlas visual colorimetric. press GB/T 9761-2008,

5.2 stipulates that the color card placed in graded uniformly distributed nine points shown in Figure B.1, the eyes away from the sample 500mm, according to GB/T 6749-1997,

6.2.1.1 test procedures relating to test results according to GB/T 6749-1997

6.2.2 Requirements expressed should meet the requirements of 4.1. B.1.2 instrument measures. Under D65,10 ° standard colorimetric observer standard illuminant conditions, the use of line with GB/T 3979-2008 in Regulation Instruments are given in Figure B.1 nine o'clock measurements shown in the test results shall comply with the requirements of 4.1. When using B.1.2 arbitration method. Figure B.1 Test Point map Test Method B.2 gloss Measured using a 60 ° angle gloss meter geometry method. Measurements were measured at point B.1 1,3,5,7,9 shown, then luster Instrument rotate 90 ° to repeat the measurement once, twice taking the average of each point results shall meet the requirements of 4.2. B.3 adhesion test method Adhesion test before B.3.1 chalk board, chalk board need to be tested before processing. The method of dealing with the new cross-chalk chalk board The powder evenly coated pen trace, and then the new chalk eraser wipe clean, ready for use when testing. The specific weight is fixed at 1kg chalk test On that chalk writing surface perpendicular (Figure B.2), to 20mm/s ~ 25mm/s speed scribing freehand 50mm of several segments. positive First at 1m away from the writing surface often visual acuity observed lines is uniform, then at a distance of 8m observed at whether distinct lines shall comply with

4.3.1 Provisions. B.3.2 conforming QB/T 2859 stipulated whiteboard pens dedicated to 60g weight sets in the lower pen, so pen with a white board 50 ° ~ 70 ° tilt angle to 20mm/s ~ 25mm/s speed scribing freehand 100mm several segments. In normal vision from the first person Writing surface at 1m observe whether there is a line break, and then at a distance of 8m observed at the line is uniform, shall comply with the provisions of 4.3.2. Figure B.2 writing surface with a chalk mark B.4 light resistance test method B.4.1 take fully consistent with the performance of a sample writing panel 80mm × 30mm piece and GB/T 730 provisions of blue wool standards 5,6,7 and discharged together (5,7 blue wool standards used to determine the degree of contrast fade 6), a stainless steel plate covered about half of the sample And blue wool reference materials, constitute test panels. Method One (under glass exposure to natural light). Use GB/T 1710-2008,

4.7 prescribed exposure box, perform exposure. Method Two (exposure to artificial sunlight). use of equipment GB/T 16422.2-1999 stipulated, exposure under the following conditions.

--- In the wavelength range of 300nm ~ 400nm irradiance (60 ± 3) W/m2; irradiance or a wavelength of 340nm is (0.5 ± 0.03) W/m2.

--- Black standard temperature. 65 °C ± 3 °C.

--- Relative humidity. 50% ± 5%. B.4.2 The test model was placed under light conditions (method or a second method). Check at appropriate intervals. Open stainless steel plate, indeed Whether the changes made between fixed blue wool standards and exposed portions of the unexposed portions. Immediately after checking back every time the original stainless steel plate position. Until the blue wool standard six fully exposed portion and unexposed portions of the contrast is equal to four Grey card, stop light. B.4.3 The test panel is removed from the device, remove the cover layer, the sample was placed in a dark thermostatic chamber (24 ± 2) h to prevent the resulting independent variable Color phenomenon. B.4.4 Assessment Results. The test sample is placed in line with natural daylight lighting conditions GB/T 9761-2008,

5.2 requested from the sample 500mm at the sample was observed with the naked eye completely exposed portion and the unexposed portions of the color difference. Sample light resistance with the fourth Grey card Level comparison, observations should be consistent with 4.7.

Appendix C

(Normative) Nominal size writing pad Writing to single-sided board size, face, work status dimensions prevail, called nominal size (see Table C.1). Table C.1 tablet nominal size in millimeters Nominal height × length No. 1 300 × 450 No. 2 450 × 600 No. 3 600 × 900 No. 4 900 × 1200 No. 5 900 × 1800 No. 6 1000 × 1200 No. 7 1000 × 2400 No. 8 1000 × 3000 No. 9 1000 × 3600 10 1000 × 4000 11 1100 × 4000 No. 12 1100 × 5000 No. 13 1200 × 4000 14 1200 × 5000

Appendix D

(Informative) Writing classification board D.1 by writing panel material classification Writing Pad by writing panel material classified as follows:

a) wooden writing board;

b) Glass writing board;

c) steel finish writing board;

d) steel enamel surface writing board;

e) veneer writing pad. D.2 writing surface classification by color Tablet writing surface color-coded as follows:

a) color writing board;

b) black writing board;

c) whiteboard. D.3 movable manner by category Writing Pad by movable manner classified as follows:

a) fixed writing boards;

b) mobile tablet;

c) rotary tablet (horizontal rotation, vertical rotation, tape);

d) sliding tablet (horizontal slide, vertical slide);

e) tablet-fan (open single fan, double fan open, more open fan);