Cylinder Lenses are typically used to focus incoming light to a line, or to change the aspect ratio of an image. Cylindrical Lenses have a single cylindrical surface that causes incoming light to be focused in only a single dimension, stretching the image,These cylindrical lenses are designed for applications requiring one-dimensional shaping of a light source.
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Quality inspection department: plastic book cover exceeds 83% safety risk
Quality inspection department: plastic book cover exceeds 83% safety risk
[Jiuzhi Plastics News] Today, news of children's precocious puberty is often reported in the news, most of which are caused by diet. Recently, the news published in Shanghai involves books, which not only affects children's safety, but also is unfavorable to education.
It is a requirement of many schools to put a layer of envelope film on the new book bag. At present, there are more plastic bags on the market. The envelope film consists of a layer of plastic material and a layer of adhesive that can be easily attached to the cover of the textbook. However, experts pointed out that plastic coated film and book cover may add plasticizers and various additives during the production process, and may contain polycyclic aromatic hydrocarbons and phthalate plasticizer chemicals. The quality and safety risk monitoring conducted by the Shanghai Quality Supervision Department recently showed that the proportion of plastic book covers with safety risks exceeded 83%, and 25 batches of phthalate plasticizers in 30 batches of related products did not meet the judgment requirements. Excessive intake of this substance may affect the hormonal system and lead to precocious puberty in children.
To this end, experts pointed out that the phthalate plasticizer does not meet the standard, or related to the plastic material of the plastic envelope film. The plastic coated film should originally be made of polyethylene (PE) or polypropylene (PP) plastic. Some inferior products are replaced by PET plastics, some of which are even derived from recycled or synthetic products.
The quality supervision department recommends that parents should strengthen their awareness of the risks of plastic coated film and book cover products, and use traditional kraft paper to cover the skin as much as possible to reduce the harm of harmful chemical substances.