22 types of household paper testing experts in Xi'an market: cotton pulp paper has better performance

Not long ago, the results of a random inspection of the quality of household paper by CCTV showed that among 162 batches of samples (including 88 batches of tissue paper and 74 batches of toilet paper), the failure rate of tissue paper reached 28 batches and 7 batches of toilet paper
.
Many Shaanxi netizens left messages hoping to conduct random checks on the quality of household paper sold in Shaanxi
.

Recently, Chinese business reporters bought 22 types of toilet paper and tissue paper at different prices and sent them to Xi’an Guolian Quality Inspection for testing of their colony count and whiteness
.

■Experiment preparation: buy paper from supermarkets, small supermarkets and farmers’ markets

■Experiment time: December 22, 2017 ~ January 15, 2018

■Experiment location: Chemical room of Xi'an Guolian Quality Inspection Technology Center

■Experimental staff: Inspector Ren Lun and Zhang Miaomiao

■Experimental method: Determined according to the standard determination method of whiteness and total number of colonies stipulated in "GB/T20810-2006 People's Republic of China National Standard Toilet Paper (including Toilet Paper Base Paper)" and "GB/T20808-2011 People's Republic of China National Standard Paper Towel Paper"

■Expert interpretation

1 The whiteness of a sample of toilet paper is not up to standard

Fluorescent brighteners increase the refractive index and look whiter

Ren Lun, an inspector of the League of Nations Quality Inspection, said: “From the test results of 22 paper samples, only the first-class product grade of Honghanxing has not reached the national standard for whiteness
.
"

Zhang Meiyun, a professor and doctoral supervisor in the School of Light Industry Science and Engineering of Shaanxi University of Science and Technology, said, “The whiteness of toilet paper mainly depends on the whiteness of pulp, and is affected by pulping and other links and factors
.
The addition of fluorescent brighteners can improve the The refractive index of light makes the paper look whiter
.
Paper absorbs light of shorter wavelengths and reflects light of longer wavelengths.
Therefore, the color of sunlight paper should be yellowish, while fluorescent brighteners absorb ultraviolet light with a wavelength of about 350nm.
The light emits blue-violet visible light with a wavelength of 420-450nm.
This blue-violet light complements the original yellowish tone of the paper, and enhances the apparent sensitivity of the total reflected light, thereby increasing the whiteness of the paper
.
" Zhang Meiyun said, despite the current The awareness of the hazards of fluorescent whitening agents is not uniform, but according to relevant national standards, it is not allowed to add chemicals such as fluorescent whitening agents to household paper.
Consumers are advised not to pursue ultra-high whiteness paper
.

The total number of colonies in the samples tested this time all met the national standard
.
"The total number of bacterial colonies is used to judge the degree of contamination of a product from production to packaging, and reflects the quality of the product
.
" Zhang Meiyun said
.

 

2 Sample product labeling is not standardized

The quality can be judged by the outer packaging label

The outer packaging of Chaolun toilet paper does not indicate the product grade and specification, and the Jinjuyuan toilet paper does not indicate the specification, which is a product labeling irregularity
.

Zhang Meiyun said that according to the relevant regulations of the national standard, the outer packaging of toilet paper and tissue paper should contain the product name, trademark, standard number, main raw materials, production date and shelf life, product model, specification, quantity, safety, product quality grade and product qualification.
Label, the name and detailed address of the manufacturer (or product responsible unit)
.

“The quality can be preliminarily judged through the labeling of the outer packaging
.
For example, toilet paper is divided into high-quality, first-class, and qualified products according to quality; tissue paper is divided into high-quality and qualified products, and consumers can buy them according to their needs
.
" Zhang Meiyun said "In addition, it is necessary to realize that although both toilet paper and tissue paper belong to household paper, their uses have a clear division of labor, and there are significant differences in raw materials, production processes, hygiene standards, and quality standards
.
For example, according to the national standard According to related requirements, the total number of bacterial colonies on toilet paper does not exceed 600CFU/g, and the total number of bacterial colonies on paper towels does not exceed 200CFU/g
.
Therefore, if you wipe your mouth with toilet paper, it is easy to wipe harmful substances such as bacteria onto your mouth and eat it into your stomach
.

 

3 Usually the quality and performance of cotton pulp paper are better

Zhang Meiyun said: “Try to avoid choosing paper that is too white, too scented, or printed with ink
.
Too white means adding a lot of fluorescent whitening agent, talcum powder, etc.
, long-term use may cause skin allergies, diarrhea, etc.
; if there is aroma, it means adding various Long-term use of chemical fragrances and air fresheners is not good for health.
Although printing inks are good-looking, inferior inks contain heavy metals such as lead and cadmium and organic solvent benzene, which can also bring health risks after contact with human skin
.
"

Zhang Meiyun suggested that when choosing toilet paper, look more and touch more
.
"First look at the outer packaging, choose the one that is neat, tight and undamaged, and marked with complete specifications; second, look at the raw material composition or main raw materials on the outer packaging, and the raw materials determine the quality and performance of the paper; third look at the paper surface, choose clean and soft, Paper without obvious dead folds, lumps, grass tendons, or pulp masses; four knead, lightly knead the paper, choose the paper without serious lint, powder falling, and no residual printing ink
.
" Zhang Meiyun said, "In terms of raw materials, usually cotton pulp Wood pulp is better than wood pulp, and wood pulp is better than wheat straw pulp
.
In addition, virgin wood pulp and virgin pulp are common in the main raw material label.
Although the word is different, virgin wood pulp means that the product uses wood that has not been reused.
Although the virgin pulp is not used twice, it may be wheat straw pulp, bagasse pulp, bamboo pulp and other fibers
.
" Huashang Reporter