Pack fruit, cooked food, leftovers … Are you using the plastic wrap correctly?

Products such as plastic wrap and fresh-keeping bag can be seen everywhere. We are used to tearing off a piece of plastic wrap to seal the cut watermelon and other fruits, and opening a fresh-keeping bag to repackage dishes to prevent cross-taste.

What gives these materials the ability to "keep fresh"? What should I pay special attention to when using it?

Types of plastic wrap

Pe (polyethylene) cling film

The main component of pe cling film is polyethylene resin, which is mainly used for packaging ordinary fruits and vegetables.

Pe plastic wrap is considered as a safe packaging material, which can package foods that come into direct contact.

Pe plastic wrap has good waterproof and air permeability, and is suitable for packaging fresh vegetables and frozen foods. However, due to its good air permeability, it is not suitable for packaging foods with high oil content and easy to be spoiled by oxygen.

Pvc (polyvinyl chloride) preservative film

Pvc is a kind of polymer compound formed by addition polymerization of vinyl chloride monomer, which has the characteristics of good transparency, high viscosity and good elasticity, but these characteristics are based on its great harm to people.

The monomer vinyl chloride of pvc has anesthetic effect, teratogenicity and carcinogenicity at the same time. Long-term contact will cause harm to human nervous system, liver and embryo, and its human safety limit is 1 mg/kg body weight.

At the same time, the thermal stability of pvc preservative film is poor, and heating or microwave treatment will cause it to crack and produce toxic vinyl chloride.

In addition, in order to make pvc material into a soft and transparent preservative film, it is inevitable to add plasticizer to change its property state during manufacturing.

Some pvc cling films may contain ethylhexylamine (deha) as a plasticizer, which will destroy the endocrine system of human body, be carcinogenic, and be easily separated from the packaging materials and enter the human body with food.

Therefore, the General Administration of Quality Supervision, Inspection and Quarantine requires food preservative film manufacturers to indicate the material and scope of application on the product packaging, and it is forbidden to use deha in the production of pvc preservative film, and it is also forbidden to directly package meat, cooked food and oily food with pvc preservative film.

Pvdc (polyvinylidene chloride) cling film

Pvdc cling film is composed of polyvinylidene chloride, a small amount of plasticizer, stabilizer and other additives, which is mainly used for packaging some cooked food, ham and other products. It has the characteristics of good freshness, firmness and easy attachment, and can prevent water evaporation. It is superior to pvc preservative film in heat resistance and safety.

Pvdc cling film can be used for both refrigerator preservation and microwave heating, and its temperature range can reach -60℃~140℃.

Plastic wrap is not everything.

Plastic wrap has the advantages of preventing food from cross-flavor, reducing bacterial pollution and maintaining food nutrients.

It has certain air permeability and limits the loss of water, can adjust the oxygen content and water content around food, and at the same time block dust and bacterial pollution to a certain extent, thus prolonging the shelf life of food.

But it is not a "universal product" for food preservation.

Plasticizer will dissolve into food in water or oil above 60℃, so it is best not to keep cooked food and food containing a lot of oil with plastic wrap.

Fruits and vegetables with high moisture content are more suitable for preservation with plastic wrap, such as apples, pears and watermelons.

It is recommended to choose pe plastic wrap, especially when it is used for meat, fruit and other foods.

Pvdc plastic wrap has better moisture retention, and can provide longer fresh-keeping time compared with pe plastic wrap.

When buying plastic wrap, you should pay attention to the specific name or chemical formula on the package, and at the same time, you must choose products marked with the words "food use".

ShangguanNo. Author: Shanghai Huangpu

A table of New Year’s Eve is full of affection.

On New Year’s Eve, we had a reunion dinner, enjoyed family affection and read mulberry. Every Hong Kong, Macao and Taiwan compatriot and overseas Chinese has his own "New Year’s Eve story".
Pot dishes that mean "pots are full"
White-cut chicken "starting from eating chicken and reuniting the whole family"
Bless the long-term dish of "long life"
Qingtian sugar cake with fragrant lips and teeth
A basin full of "auspicious dishes"
The real taste is reunion.
Our reporter Chen Ran
Deep-fried goo-goo meat, hung with sweet and sour thick juice made of sugar and vinegar, and presented with colored pepper and pineapple pieces; Pinch the good tiger spots out of the pot with a stopwatch, pour steamed fish and soy sauce, and then pour a thin layer of ginger and onion hot oil …
Every New Year’s Eve, Mrs. Xie’s kitchen is full of fragrance, wrapped in a strong flavor of the year.
"In a year, my favorite meal is New Year’s Eve. Although it is harder than usual, it is the happiest thing to make your family satisfied and happy. " Mrs. Xie, who lives in Chai Wan on Hong Kong Island, and Mr. Sheng have two sons. Today, sons have grown up and left home to study and work hard. Therefore, the Spring Festival has become one of the few reunion moments for Xie Jia every year. A week before New Year’s Eve, Xie Jia had already begun to prepare for the New Year’s Eve dinner.
Speaking of New Year’s Eve dishes, Mrs Xie is always in high spirits. "The eldest son loves to eat cows. I bought the freshest oxtail early, stewed it with lobster sauce and bean paste, stewed it until it was soft and rotten, and the bovine bone marrow was also dissolved in the soup. Every bite was rich in gum and sauce. Shrimp is my husband’s favorite. In the New Year’s Eve dinner, Aauto Quicker’s braised black tiger shrimp is served, which is fried first and then stewed. The red color is festive and appetizing. My youngest son likes steamed ribs that are soft and waxy. This time, I put a layer of tender tofu under the marinated ribs and put them into the pot. Gravy and hot tofu are estimated to make him eat a big bowl of rice … "
Mrs Xie smiles brightly. A hearty and delicious New Year’s Eve dinner is full of love for your family.
Hong Kong-style New Year’s Eve dinner pays attention to "good luck", so every family must have several kinds of "auspicious dishes" on the table, "fish every year", pig’s hand symbolizing "windfall" and "round and round" mushrooms … In Tangfang Village, Pingshan, Yuen Long, New Territories, a pot dish feast meaning "full of pots" has been circulated for generations. Pingshan traditional basin restaurant started with this ancient "Hong Kong flavor". Deng Lianxing, a descendant of the third generation, introduced that the traditional potted vegetables are burned with firewood, which has a unique fireworks fragrance for a long time.
A seemingly simple pot dish is actually full of flavors. The ingredients include prawns, oysters, squid, pigskin, mushrooms, chicken, herring balls, pork, radish, bamboo shoots and Nostoc flagelliforme. Roast, stew, roast, stir-fry, marinate, stir-fry … All kinds of ingredients are self-contained, and then stacked layer by layer according to a specific order, and different flavors absorb and infiltrate each other, making people feel more delicious as they eat.
The New Year’s Eve dinner should be delicious, as the classic TV series in Hong Kong says, "The most important thing for a family is to be neat." In the laughter, the whole family sits around the table, which is the true taste of New Year’s Eve.
Mama home-cooked dish
Memories of the taste of the year
Our reporter Suning
In the small town of Haojiang, the end of the twelfth lunar month is getting stronger and stronger, and people are happily preparing for the New Year. "At the end of the day, business people will feast their buddies and give out year-end bonuses." Li Baohua, who works as a civil servant in the Macao SAR government, said that the 28th of the year is a day to wash dirty clothes, and families should clean their houses to get rid of the old and welcome the new.
New Year’s Eve is the climax of the year. "When my grandmother was alive, she always adhered to traditional customs." Li Baohua recalled that the old lady got up early in the morning every New Year’s Eve, prepared a table of small dishes to worship in front of the ancestral memorial tablet, and prayed for a smooth coming year. Then go straight to the vegetable market to prepare a reunion dinner, that is, New Year’s Eve.
In Li Baohua’s impression, the 30-year-old vegetable market has always been a sea of people. People should not only choose the freshest ingredients for the evening reunion dinner, but also prepare "year-pressing" things. According to the traditional custom, lettuce, celery and onion with roots should be tied with red rope and attached with red paper. A shad, can’t scale, can’t laparotomy, complete a tail. Some people have to put a whole white-cut chicken, and all the ingredients, together with oranges with leaves, will be stored from the 30 th of the year to the second day of the New Year’s Day, in order to have a head and a tail and have more than one year.
Reunion is the eternal theme of New Year’s Eve. When the sun sets on the western hills, the whole family sits neatly around a table. And almost every dish on this table has its meaning.
"Every family celebrates the New Year’s Eve with lettuce by the fire. Full of yellow sand makes a big cockroach, and the firecrackers ring in the sky. " Baohua Li said that the last flower-exploring Shang Yanliu mentioned the word "Xian" in his poem "Yueyuan Old Calendar Folk Bamboo Branch Ci", which is homophonic with "Xian" in Cantonese, implying that Xian is rich in years. However, yellow sand clams are rarely seen in today’s reunion dinner, but pork tongue and oyster sauce are indispensable. People in Guangfu call the pig’s tongue "pig’s tongue", and "pig’s tongue" and "profit" are homonyms. People from businessmen to wage earners have a special liking for this dish. There are chicken, boiled chicken, fried chicken with soy sauce, ginger and onion chicken … No matter how to make it, a chicken is indispensable for the reunion dinner.
For Li Baohua, the best reunion dinner must be mom’s home-cooked meal. What I miss all my life is also the figure of my mother in the taste of the year. "My memory of the taste of the year began with my mother’s soy chicken in the reunion dinner." Li Baohua said that her chicken with soy sauce was not soaked, but fried. Heat a red pot, put down the oil and chunks of ginger, fry the chicken until fragrant, pour the adjusted soy sauce, and cook slowly with slow fire. The skin is fragrant and the meat is lazy, and the thick juice is heavy.
All kinds of special flavors
Behind is hometown.
Our reporter Wang Yao
In Taiwan Province, from the first half of the year, the news of sweeping New Year’s Eve and the advertisement of New Year’s Eve at the door of the store repeatedly released the message that "Chinese New Year is coming soon", which made people involuntarily look forward to the "big meal" on New Year’s Eve.
Mr. and Mrs. Zheng Shijie, who are in their forties, live in Taipei. "On New Year’s Eve and New Year’s Eve, I usually go to my husband’s house to eat, and I will go back to my mother’s house on the second day." Mrs. Zheng, who is usually in charge of cooking, said that she was very relaxed on New Year’s Eve. "The kitchen on New Year’s Eve is the home of her mother-in-law, and no one else can get involved."
When Mr. Zheng was young, he lived in the family village (a house built for the soldiers who moved to Taiwan and their families). The whole family village was like a big family. "At that time, every family really didn’t lock the door." Adults were colleagues and children were classmates, taking care of each other, regardless of each other; Whoever cooks something delicious will share it with everyone. As soon as possible, the residents of the village come from all over the mainland. Over time, each family’s diet has all kinds of distinctive flavors, and so does the New Year’s Eve. Mr. Zheng’s grandfather came from Jiangxi and his grandfather came from Hubei. "When we were young, we ate New Year’s Eve at grandma’s house and later at mom’s house, but there was no obvious regional characteristics."
Although many families now go to restaurants for dinner to save trouble, Mr. Zheng’s mother still insists on cooking by herself. Ten days before the Chinese New Year, I began to buy ingredients and reserve new year’s goods.
On the dinner table of the New Year’s Eve, there are bacon sausages and pot-stewed vegetables made by ourselves. "There are also stewed lion’s head, shredded pork with fish sauce, shrimp, and of course, fish is indispensable, because there is more than one year, and you can’t finish it on New Year’s Eve. Only when there is surplus will you have more than one year." There must also be jiaozi, which contains coins. Whoever eats it represents better luck. " Mr. Zheng said.
"Some families in Taiwan Province eat hot pot on New Year’s Eve, which has a surrounding atmosphere. Pay attention to a little, but also have a Buddha jumping wall. " Mrs. Zheng said. "When we were young, we all went to my grandmother’s house in Tainan for dinner. My grandmother was chaozhou people. The dinner would make chicken rolls, stewed whole ducks, radish cakes, and’ long-year dishes’ that Taiwan Province must eat around the stove. Because it is not easy to boil, it symbolizes a long life. You can’t cut it off when you eat it, but eat it whole leaves."
Sugar cakes stay fragrant for a long time.
Nourish the wandering heart
Our reporter Cheng Long
As the year is approaching, in a small mountain village in Qingtian, Zhejiang, every household is busy: washing lotus leaves, grinding rice noodles, mixing stuffing and steaming sugar cakes. This is the happiest memory of Wang Xinte, an overseas Chinese living in Spain: every New Year, he can eat Qingtian sugar cake, which is sweet but not greasy, soft and not sticky, and his lips and teeth remain fragrant.
"The taste of the year is the taste of Qingtian sugar cake!" Wang Xinte said, "It starts to be cooked around the twentieth day of the twelfth lunar month every year, and it takes more than ten hours to steam in a cauldron. Then cut it into pieces and eat it slowly. Visit relatives and friends and bring some as a New Year gift. "
In 2000, Wang Xinte arrived in Spain, and the first year of Spring Festival was simple. "There are only seven or eight China people in the whole city, so it is very lucky to eat Chinese food, let alone eat sugar cakes." Wang Xinte said that in the past, local people knew little about the Spring Festival. "Now, the Spring Festival has become a household name."
On the first day of the first month of 2018, Wang Xinte took several overseas Chinese to Aragon TV Station to introduce the Spring Festival in China by live broadcast. "We specially prepared two kinds of food. One is jiaozi, and the other is sugar cake. The audience and the host were full of praise for China cuisine. Through delicious food, Spanish friends have a deeper understanding of China and Qingtian. This has also created a more friendly atmosphere for our overseas Chinese to live and develop in the local area. "
Wang Xinte also moved the New Year’s Eve dinner to Spain. "This year, we will invite people from all walks of life in Spain to attend the Spring Festival dinner, and invite them to taste the special New Year’s Eve dinner in China and experience the customs of worshipping the New Year and giving lucky money." Wang Xinte, who is now the president of Spain’s Spain-China Friendship and Cooperation Association, hopes to take the New Year’s Eve dinner as a brand activity to promote Chinese culture and run it in Spain for a long time.
The charm of Chinese culture is getting bigger and bigger, and the China Year around the world is getting more and more prosperous. "Now many supermarkets in Spain are selling sugar cakes, and there are more and more patterns." Wang Xinte said, "My children were born and raised in Spain. They don’t have the Spring Festival experience as I did when I was a child, but I hope they can learn about the Spring Festival through these activities and never forget their roots."
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In 2023, the first Bay Area National Fashion Industry Agglomeration and Digital Intelligence Transformation and Development Conference was held in Guangzhou.

Zhongxin. com, Guangzhou, December 11th (Reporter Jun Guo) The first 2023 Bay Area National Fashion Industry Agglomeration and Digital Intelligence Transformation and Development Conference was held in Guangzhou on the 10th. More than 300 celebrities and representatives from the fashion industry and digital economy, as well as representatives from more than 30 universities including Jinan University and South China Agricultural University attended the meeting to discuss how to release the vitality of the national fashion industry and how to use digital technology to help the industry develop with high quality.

The first 2023 Bay Area National Fashion Industry Agglomeration and Digital Intelligence Transformation and Development Conference was held in Guangzhou on the 10th. Photo by Jun Guo

The conference was co-sponsored by Guangdong Garment Industry Association, Guangdong Electronic Commerce Association, Guangdong Business Economics Association and China Education Group, and undertaken by Guangdong Baiyun College. The theme of the conference is "Guangdong-Hong Kong-Macao Greater Bay Area National Fashion Industry Agglomeration and Digital Intelligence Transformation". Ren Xingzhou, former director of the Market Economy Research Institute of the State Council Development Research Center, Fu Longcheng, vice president of China Business Federation, and Ji Wenbo, vice president of China Fashion Designers Association, and other industry experts gave speeches on topics such as "Super-large-scale consumer market and great opportunity of fashion industry in the tide of the country", "Boosting consumer service innovation to provide strong support for building a new development pattern with double cycles" and "The tide of the country calls for innovative talents in international fashion design".

In his keynote speech, Ren Xingzhou pointed out that the trend of China’s consumer fashion showed obvious stage characteristics with the development of reform and opening up. Take clothing as an example, from the imitation of fashion in Hong Kong and Taiwan in 1980s and 1990s, to the pursuit of Japanese and Korean fashion trends by some young people, to the favor of European and American fashion brands after the obvious upgrade of consumption, and to the rise of national fashion and the development of rapid consumption.

Ren Xingzhou believes that national fashion is the product of China’s sustained economic development and escalating consumption, which is determined by China’s manufacturing supply capacity, consumption scale and consumption grade. In essence, it is the dynamic balance between consumption and supply, and it is also the result of strong industrial chain, supply chain and ecological chain support. At present, the development of national fashion is facing great opportunities, and cultural self-confidence is a powerful driving force for the rise of national fashion. Digital economy is an accelerator for the development of national fashion industry, and the continuous opening up has improved the internationalization level of fashion industry.

At the meeting, Wang Xianqing, vice president of China Business Economics Association, released the Report on the Development of Fashion Industry in the Bay Area in 2023, which revealed the development trend of fashion industry in the national tide represented by clothing with data and cases, and deeply studied the layout and characteristics of fashion industry agglomeration in Greater Bay Area. (End)