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1、INTERNATIONAL STANDARD ISO 11540 First edition 1993-09-01 Caps for writing and marking instruments intended for use by children up to 14 years of age - Safety requirements Capuchons dinstruments pour Mcriture et Ie marquage destin b) reference to this International Standard, i.e. ISO 11540. Dimensio
2、ns in millimetres a) b) a) Line of cotton thread b) Included area Figure 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:52:33 MDTNo reproduction or networking permitted wit
3、hout license from IHS -,-,- ISO 11540:1993(E) Annex A (normative) Test for air flow A.l Principle The test cap is fully inserted into an elastomeric tube of the appropriate diameter and the air flow through the tube and the pressure differente are measured in both directions. A.2 Apparatus (see figu
4、re A. 1) A.2.1 Air supply, pulse-free, at a rate c 25 I/min and within the pressure range 50 kPa. A.2.2 Flow regulator, capable of control flow with an accuracy of + 0,I I/min. A.2.3 tween + 0,2 - A.2.4 ure of A.2.5 )f at least 4 kPa to ing the air Flow gauge, capable of measuring flow be- 5 I/min a
5、nd 25 I/min with an accuracy of /min. Pressure gauge, capable of measuring press- at least 4 kPa to an accuracy of &- 0,OI kPa. Coupling and tubing, suitable for connecting the equipment described above in accordance with figure A.1 . A.2.6 Elastomeric tubing, with an internal diameter of 80 % to 85
6、 % of the circumscribing circle of the cap to be tested, measured at its widest Point. The wall thickness of the tubing shall be 0,75 mm + 0,25 mm and the Shore A hardness shall be 55 + I. - A.3 Procedure A.3.1 Cut the elastomeric tubing (A.2.6) into a length such that when the cap is inserted there
7、 is a relaxed diameter of tubing at both ends of the cap when connected to the apparatus. A.3.2 Apply a soap Solution or other suitable low viscosity Iubricant to the full internal area of the tub- ing. A.3.3 Insert the cap into approximately the centre of the tube length and ensure that as far as p
8、racti- cable the cap is parallel to the major axis of the tubing. A.3.4 Using suitable connectors and tubing (A.2.51, connect the tube/cap assembly (A.3.3) to the appara- tus as in figureA.1. A.3.5 Turn on the air supply (A.2.1) and adjust the flow until the pressure gauge (A.2.4) indicates a e diff
9、erente of 1,33 kPa. pressu A.3.6 WJW A.3.7 Record the flow-rate indicated on the flow A.2.3) at this pressure. Turn off the air supply, remove and reverse the tube/cap assembly and repeat A.3.4 to A.3.6. A.3.8 Test IO taps, giving a total of 20 air flow re- sults. Record separately the air flows for
10、 each cap tested and report the minimum air flow recorded. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:52:33 MDTNo reproduction or networking permitted without license fro
11、m IHS -,-,- ISO 11540:1993(E) b) / Cl d) e) a) Flow control valve b) Flowmeter c) Pressure gauge d) Tubing e) Cap f) Air supply g) Air exhaust Figure A.l Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not
12、 for Resale, 04/26/2007 02:52:33 MDTNo reproduction or networking permitted without license from IHS -,-,- yuelq gal Aeuoymu! a6ed s!yl Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26
13、/2007 02:52:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 11540:1993(E) UDC 686.863.077-053.415 Descriptors: ball-point pens, felt pens, fountain pens, taps (pens), specifications, safety requirements, marking. Price based on 4 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/26/2007 02:52:33 MDTNo reproduction or networking permitted without license from IHS -,-,-