深圳市美华安规仪器有限公司
地址: A. 深圳光明新区光明
圳美311号/518107
B. 东莞大岭山镇渭
溪路/523829
热线: 155-0203-6348;
136-1283-4185
电话: 0755-3288-5887
传真: 0755-3288-5887
Q Q: 1-4848-7-5858;
4-9327-8805
邮箱: sm#ag17.wang
okgang#163.com
(#请改@)
官网: www.ag17.wang
论坛: bbs.ag17.wang
MH-25560718 UL电线表面印字耐磨试验装置|印字耐磨块|Durability of ink printing
符合UL2556 第7.18节 Durability of ink printing标准,用于检测电线护套印刷字体的耐磨性能。
试验工位: 1位
操作方式:手动操作
荷重块尺寸: 25X50mm
荷重砝码: 450±5g
毛毡厚度:1.2mm
荷重尺寸: 25×50mm(1×2 inch)
UL 25567.18 Durability of ink printing
7.18.1 Scope
This test establishes the method for determining the durability of ink printing.
7.18.2 Apparatus
The apparatus shall consist of
a) a forced-circulation air oven in accordance with Clause 4.2.3, Item (i);
b) a temperature-measuring device with an accuracy of ±1 °C;
c) a kraft felt with a thickness of 1.2 ±0.25 mm (0.05 ±0.01 in) not having more than 30% wool content and the remainder of the composition being rayon; and
d) a weight block with a machined face of 25 mm (1in) by 50 mm (2 in) and a uniform height to ensure even weight distribution throughout the area of the lower face. Clamps or other means shall be provided for securing the craft felt in place. Without the felt in place, the weight block and clamps shall be 450 ±5g(1 ±0.01 lb).
7.18.3 Preparation of specimen
Two specimens shall be taken from finished wire or cable, or from the wire or cable during manufacture.
The specimens shall be 300 mm (12 in) in length with the printing centered. The specimens shall be handled minimally and shall not be wiped, scraped, or otherwise cleaned in any way.
7.18.4 Procedure
7.18.4.1 One specimen shall be conditioned in a forced-circulation air oven at the specified temperature and for the specified period of time. The other specimen shall be maintained at ROOM TEMPERATURE for a minimum of 24 h.
7.18.4.2 Upon removal from the oven, the conditioned specimen shall be allowed to rest for a minimum of 60 min prior to testing. Following the rest period, the specimen shall be placed and secured on a solid, flat, horizontal surface with the printing up and at the center of the length of the specimen.
7.18.4.3 With the specimen secured in place, the felted surface of the weight block shall be placed horizontally on the printed area of the specimen with the 50 mm (2in) dimension of the felted surface parallel to the length of the specimen. With the weight block resting freely on the specimen, the weight block shall be slid lengthwise by hand along the printed area of the specimen for a total of three cycles, each cycle consisting of one complete back-and-forth motion covering the center 250 mm (10 in) of the
specimen. Three cycles shall be completed at an even pace within a total of 5 to 10 s.
7.18.4.4 The procedure described in Clause 7.18.4.3 shall be repeated on the remaining specimen.
7.18.4.5 The felt may be used for several tests, but shall be replaced as soon as the fiber is flattened or becomes soiled. When not in use, the weight shall not be stored resting on the felt surface.
7.18.5 Results and calculations
The legibility of both specimens shall be examined with NORMAL VISION and noted.
7.18.6 Report
The report shall include, as a minimum, indication of legibility of ink printing, temperature, and duration of conditioning.
安规仪器网/美华安规仪器---追崇原创、重视知识产权和尊重劳动成果,也是行业发展主旨,禁止盗链、采集、复制及转载等非法行为,一经发现保留追责权力。