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织物顶破强力测试标准及影响因素

织物顶破强力测试标准及影响因素 一、 织物顶破强力常用的测试标准: GB/T 19976-2005 纺织品 顶破强力的测定 钢球法; FZ/T 01030-2016 针织物和弹性机织物接缝强力和扩张度的测定 顶破法; ASTM D3787-2016(2020) 织物顶破强力的标准试验方法 等速牵引(CRT)钢球顶破试验; 二、 影响织物顶破强力的因素 1. 织物本身的内因 纱线的断裂强力和断裂伸长的影响,当织物中纱线的断裂强力大、伸长率大时,织物的顶破强力高。织物厚度的影响,在其他条件相同的情况下,当织物厚时,顶破强力大。织物的经或纬向密度。当其他条件相同,织物经纬密度不同时,织物顶裂时必沿密度小的方向斯裂,裂口呈直线性,织物顶破强力偏低。纱线的钩接强度。在针织物中,纱线的钩接强度大时,织物的顶破强力高。纱线的细度、线圈密度也影响针织物的顶破强力。提高纱线密度和线圈密度,顶破强力也有所提高。织物在煮漂,磨毛,染色,酶洗,树脂定性整理等处理的影响。在这些不同工艺的影响下,织物的项破强力下降,并且采用不同工艺处理,不同的用料,顶破强力下降程度也不ー样。一般来说,颜色深的织物比颜色浅的顶破强力要低些。 2. 外在因素的影响 1)采用测试方法的影响 采用不同的测试方法,测试結果也会受到影响。一般来说,采用液压法和气压法所测得顶破强力比钢球法所测的项破强力要稳定许多。要是没特殊要求,采用液压或气压法。在项破强力小于80KPA时,气压法和液压法相差不大,但是在项破强カ大于80KPA时,一般采用液压法会稳定些。采用相同的测试方法,测试量程不相同,测试结果也会有偏差。实践证明,同为液压法,采用不同的量程,其测试结果也有一定的偏差,一般米说,采用小的量程,测试的结果会准确些。因此,能够采用小的量程,测试者就要采用小的量程。 2)测试环境的影响 在顶破强力测试中,测试环境对织物顶破强力的影响也很大,因此测试者需要严格按照标准来选择相应的测试环境。 3)操作者的影响 测试者读数的影响。相对液压式顶破强力机来说,由于不同的人目光不一致,或是没有在计数器的正方读数,读数也会有偏差的。测试者选错标准方法的影响。特别相对于气压式的织物胀破强度仪来说,要是选错标准方法或选错测试杯,或校准错误,其测试结果也会受到很大的影响。测试者操作不规范的影响。特别在液压式顶破强力机测试过程中,要是测试者不能在织物顶破瞬间把气阀手柄及时移回原位,顶破强力就会偏大。测试者取样的影响。每个试样不但要有代表性,还需要在规定的范围内取样,要是测试者在布边或在受拉伸过的地方取样,顶破强力通常会偏少。 浙江恒祥检测技术服务有限公司是江浙沪地区第三方检测机构,为纺织服装、玩具儿童用品、鞋类箱包、食品包装材料等提供一站式检测检验服务,顺利通过CNAS、CMA、CPSC认证、国家级高新技术企业认证。其检测报告可用于国内外互认、贸易通关、政府招投标以及司法鉴定,具有社会和商业证明作用,信赖度高,同时得到美国等海外60多个国家及地区认可,为您企业市场经营助力。

2021-07-19

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Definitions and differences of SVHC, authorized substances (Annex 14), and restricted substances (Annex 17) under REACH

Often companies are asked by customers to test REACH 191 items, and are asked whether the product contains SVHC and whether it complies with REACH Annex 17 (RSL list). However, companies are often not particularly clear about where these terms come from and what the specific requirements are. In fact, the terms SVCH, REACH Annex 17, REACH Authorized Substances all come from the EU REACH regulations. They are all the control requirements set forth by REACH regulations specifically for the use of chemicals in downstream articles. SVHC definition SVCH stands for Substance of Very High Concern. Generally speaking, REACH 163 items and REACH 191 items refer to SVCH. SVCH is generally updated twice a year, in June and December respectively. As of 2018.09.07, SVHC has 19 batches with a total of 191 substances. SVHC range SVHC generally has one or more of the following dangerous characteristics (the characteristics of Article 57 of the REACH Regulation): According to CLP regulations, substances with class 1 or class 2 carcinogenicity, mutagenicity or reproductive toxicity, namely CMR 1A/1B substances; persistent, bioaccumulative and toxic substances, namely PBT substances; high persistence, high Bioaccumulative substances, namely vPvB substances; there is evidence that there are equally harmful substances, such as endocrine disrupting substances. Regulatory requirements for SVHC The regulations have the following requirements for SVHC: 1. Notification: If the content is >0.1% and at the same time meets the export volume of >1 ton/year, it needs to be notified to ECHA; 2. Information transmission: If the content is >0.1%, information about the substance needs to be transmitted in the supply chain. Authorized substance definition Authorized substances refer to those substances that can only be put on the market and used after being authorized by the government. Authorized substance scope Authorized substances are selected from SVHC, that is, SVHC is a candidate for authorized substances. Therefore, the official SVHC list is also called the Candidate List (Candidate List). List of authorized substances Authorized substances officially announced are required to be included in REACH Annex XIV. There are currently 43 authorized substances. Regulatory requirements for authorized substances According to the REACH regulations, the use and placing on the market for use of substances listed in Annex XIV, whether it is the substance itself, as a component of a mixture or used in an article, from a certain date (the regulations call this date the "sunset day" ), are prohibited unless the use has been authorized or is an exempt application. The substances in this Annex XIV are authorized substances. In layman's terms, an authorized substance cannot be freely exported to the EU after its sunset day, and it needs to obtain relevant authorization from the EU before it can be exported. It should be noted that the placing on the market and use of articles containing authorized substances do not require authorization. That is, the authorization is for the requirements of the substance, not for the article. In addition, according to regulatory requirements, when the sunset day of the authorized substance is reached, ECHA needs to consider whether the substance has a risk of insufficient control over human health or the environment. If it exists, ECHA needs to prepare a corresponding file to propose the substance. At this time, the authorized substance may become a restricted substance. Definition of restricted substances Restricted substances are substances whose dosages are restricted in certain products. List of restricted substances Restricted substances are mainly those that pose unacceptable risks to human health or the environment. Annex XVII of the REACH Regulation is the complete list of restricted substances. There are currently 71 restricted substances. Regulatory requirements for restricted substances The use of restricted substances shall comply with the requirements in the second column of Annex XVII of REACH. For example, item 5 of Annex XVII requires that benzene cannot be used in toys or toy parts, and the mass fraction of free benzene in toys or toy parts shall not exceed 5 mg/kg (0.0005%). Then, toy companies need to pay close attention to this restriction to ensure that toys or toy parts cannot contain more than 5 mg/kg of free benzene. Other companies, such as textile companies, if their products contain textile parts that will be used in toys, they need to pay attention to whether their textile parts contain more than 5 mg/kg of free benzene to avoid violations.

2021-07-13

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