The qualified rate of this supervision and spot check is 9 1.7%, and the exercise books produced by Nanzhong Printing Factory in Nanchuan District of Chongqing are considered unqualified because the quantity and brightness are not up to standard.
Too high brightness and whiteness of exercise books will make people's eyes feel uncomfortable and even affect their eyesight.
Supervision and spot check:
The reason why the exercise books produced by this enterprise failed twice is related to brightness and whiteness.
According to the relevant person in charge of the Municipal Bureau of Quality Supervision, this exercise book quality special spot check involves 12 batches of products produced by 12 enterprises in seven districts and counties, including Yongchuan District, Kaizhou District, Nanchuan District, Shapingba District, Tongnan District, Rongchang District and fengjie county, which are mainly concerned with quantification, brightness (whiteness), opacity, dust, printing and binding quality of unit products, and labeling.
The spot check results show that 1 1 batch products pass the spot check, and 1 batch is found to be unqualified. The unqualified items are quantitative and brightness (whiteness) respectively.
The reporter noticed that the manufacturer of unqualified exercise books is Nanzhong Printing Factory in Nanchuan District, Chongqing, and the representative batch of exercise books is 5,000.
Just last August, Nanzhong Printing Factory in Nanchuan District of Chongqing was also on the list in the recall information of defective products released by the Municipal Quality Supervision Bureau for the first time. The 6,000 exercise books produced by this factory were found to have exceeded the standard in brightness and whiteness of the cover during the regular supervision and spot check by the quality supervision department, and the manufacturer took the initiative to apply for recall.
At present, the Municipal Quality Supervision Bureau has instructed the relevant district and county quality supervision departments to order enterprises to rectify within a time limit and carry out post-processing work according to law.
Sampling inspection:
Anti-myopia exercise books are not necessarily anti-myopia, although the brightness is low.
Experts from the Light Industry Center of Chongqing Institute of Metrology and Quality Inspection said that the brightness of exercise books is closely related to the perception of human eyes. Excessive brightness will make people's eyes feel uncomfortable and even affect their eyesight.
According to experts' analysis, the main reason why the brightness and whiteness of exercise books are unqualified is that manufacturers use too much paper containing fluorescent brighteners in order to reduce product costs and improve the visual sense of products.
So, what is the brightness and whiteness of the exercise books sold in the market? The reporter bought five exercise books in stationery stores outside many schools in the main city and sent them to Chongqing Institute of Metrology and Quality Inspection for testing.
After the inspector placed the workbooks in a specific environment for 24 hours, the brightness and whiteness of five workbooks were tested with a whiteness meter. The experimental results show that the brightness and whiteness of the five exercise books do not exceed 85%, which meets the requirements of relevant standards.
Among them, an anti-myopia exercise book has the lowest brightness and whiteness. But inspectors said that low brightness and prevention of myopia are two different things. "It is not low brightness that can prevent myopia." Testers said that many myopia prevention exercises are based on low brightness or paper color, but such basis is not scientific.
Take this myopia prevention exercise book for examination as an example. Because of the bright colors, it is easy to feel uncomfortable after looking directly at 1 minute.
Consumer reminder:
Parents can use printed paper for comparison. First, judge brightness and whiteness. "Made in Chongqing" homework should indicate the paper weight.
Testers said that this anti-myopia exercise book submitted for inspection is not only a question mark on its anti-myopia ability, but also an unqualified product. Because the exercise book is marked with Chongqing local standard-DB50/T203-2009 "Printing Quality Standards and Inspection Methods of Exercise Books for Primary and Secondary Schools", but the paper weight is not marked according to the standard requirements, which is unqualified in quantity.
It is understood that quantification is the basic physical performance of exercise books. According to Chongqing local standards, different exercise books have different quantified values corresponding to them, and the weight of cover paper and inner page paper per square meter should be clearly indicated in the identification column of exercise books.
Therefore, when parents buy exercise books for their children, if they find that the exercise books indicate the implementation of Chongqing local standards, then they should indicate the number of exercise books.
In addition, according to Chongqing local standards, the brightness of exercise books should be between 65% and 85%. Let's talk about how to judge that the brightness and whiteness of the exercise book are not beyond the standard. Experts provide a simple method: compare a piece of white A4 printing paper with the paper in the exercise book. If the exercise paper is whiter than the white A4 printing paper, the brightness is likely to exceed the standard. Because the brightness of white A4 printing paper generally exceeds 85%.
Experts also advise parents not to let their children use white exercise books. If the user stares at the blank paper of the exercise book for about half a minute, his eyes feel uncomfortable, maybe the brightness of the exercise book is too high.