I'm very upset these days. I'm always troubled by something, and my heart hurts inexplicably. Sleep quality is not high, dreams always make people don't want to wake up, and the biological clock begins to be disordered. After getting up in the morning, in order not to be silent in my dreams, I began to find some housework to do.

? I accidentally saw a pair of tin thermos bottles lying quietly in the corner of the balcony. Thinking of how many times his son found it, he shouted, "Mom, we now have a fast water heater for washing vegetables, a pneumatic electric kettle for boiling water, a natural gas water heater for bathing, and hot and cold water can be used at any time. How convenient it is." There are all kinds of thermos cups at home. Look at our pair of thermos bottles. I used it when I was a child, but now you don't use it. There is no basement at home, and the home looks messy. Its service life is enough, keep the occupied space and eliminate it! " .

? I quietly put them in a hidden place as antiques, fearing that he would throw them away when I didn't find them. In my heart, I want to find a place to send it out. There are just a few new people in the community recently, and the electric kettle is not enough to boil water. I remembered the long-forgotten thermos bottle, which can be sent to the place where it is needed.

I quickly took it out, brushed the dust off the surface with a rag, poured white vinegar into the bottle, added some water to cover the cork, and kept shaking up and down. Then find a new brush to brush the inner wall. Finally, pour out the scale in the bottle and look into the head. The inner wall of the bottle is as clean as new. Wash the outside of the bottle with small steel balls. The bottle cap is made of aluminum and is as clean as new after cleaning. The bottle body is a floral pattern with white characters on a red background, and the festive and auspicious tin thermos bottle is scrubbed clean by me bit by bit and restored to its original appearance.

Looking at thermos bottles, I remembered the first time I saw them. 1996 On a weekend in June at 5438+00, my father bought it from Shizuishan Department Store as my dowry. My mother, who is used to asking the price, asked, "Lao Li, how much is such a good thermos?" "80 yuan" father answered simply. Mother exclaimed, "What! An 80 yuan is too expensive. " Father quickly explained, "Juanzi and Rong Jian don't have much income. This pair of tin thermos shop assistants has the best introduction quality, good thermal insulation performance, and the overall shell is durable and bump-resistant. It's not bad to get married and be a daughter for life. " Mother said, "The salesman said a few nice words, and you were cheated again. Plastic thermos bottles are not expensive. " I heard that I was reading in the dormitory, so I ran out and picked up the kettle and looked around, but I couldn't let it go. Hurriedly hugged his mother and said, "Don't worry, Mom, I will cherish it." My mother looked at me and said with a smile, "Your father dotes on you very much, and the bride price is free of any money. A pair of double-sided porcelain washbasins, just buy one in 40 yuan, a department store, and 80 yuan; Now the thermos is spent again 160 yuan. Baihua market also has private shops to buy daily necessities, but he is looking for state-owned enterprises. Mom doesn't care about money, and she can't live at home without an accountant. You will know when you get married. " Father's pet said: "Forget it, our eldest daughter must be glamorous when she enters her husband's house." It is worthwhile to spend more money and less money. " My mother looked at me and said to me, "Don't put the cork too tightly after pouring the boiled water after marriage. Don't fill the kettle too full, and don't let the water reach the height of the cork. A distance from the bottle mouth can make the kettle keep warm better. Handle with care when using, and wash things with less cold water to protect yourself from being burned ... ". Although I nodded hard, my eyes were always on the thermos. I looked into my head and saw that the new bottle was made of double glass, with silver plating on both sides of the interlayer, but it was as bright as a mirror when I looked closely. Naughty breath, buzzing sound, and then looked back at dad and smiled contentedly.

? I checked the historical data. According to research, the earliest thermos in China appeared in the late Northern Song Dynasty. This kind of thermos bottle is also called "thermos" and "hot kettle". In the catering industry of the Song Dynasty, it has become an independent business for vendors to "sell tea with bottles" on winter nights. The "bottles" they use are thermal thermos bottles. For example, Cai Xiang said in the Book of Tea, "If you want to order tea, you must first? If it is hot, the tea will not float when it is cold. " In Song Dynasty, the thermos bottle was made of glass and wrapped with mercury. Its basic style is: wide mouth, long neck, long belly, bottle mouth with an open bottle cap and a handle, which is not much different from modern ones. It is said that the emperor also gave this warm water vessel to the married princess, and this custom has been preserved to this day.

Time flies, they have been married to me for only a handful of 25 years, and moved with me three times. I remember that my mother's old thermos was broken and I was going to buy a new one. After reading it, I gave another 80% new thermos, which I couldn't bear to use at home.

Bottle stoppers of thermos bottles are consumables, and my father always goes to the morning market to buy a pair. When you come back, the cork of the new water bottle should be soaked in cold water before use. Because the dry cork covers the bottle mouth, it will naturally absorb water and expand, which has a certain breakthrough. But also scalded with boiling water to prevent the smell of cork and affect the water quality. Mother also wrapped it in gauze, one for me and the other in the thermos bottle of her parents.

Whenever I go back to my mother's house to pour water from a thermos bottle, I always feel kind. My thermos was moved to scraggy, and there were several potholes at the bottom. After a long time, it was found that the base of the thermos bottle was easy to accumulate water, hiding evil and accommodating evil. However, the other one in my mother's house is intact and the base is clean and tidy. Last year, my mother changed the stainless steel thermos bottle and eliminated the tin thermos bottle. I took it home and made another pair.

I remember chatting with party member in the community. I didn't mean to say that my colleague poured water into the plastic thermos bottle and it burst. I almost got burned while hiding. There is also a mother-in-law who pours water for her brother-in-law in a plastic thermos during the Chinese New Year. Thanks to the soldier's instinct and quick reaction ability, there is not much water in the kettle, but my feet are still a little hot in slippers. I now question the quality of the thermos. He used to work in Shizuishan Glass Factory, and he talked about how thermos bottles were made with great interest. The inner container of thermos bottle is double-layer glass, and both layers of glass are silver-plated, which can reflect heat rays back like a mirror, thus cutting off the path of heat radiation. Vacuum pumping between two layers of glass in thermos bottle destroys the condition of convection conduction. The thermos bottle cover is made of cork which is not easy to transfer heat, blocking the passage of convective heat transfer. If the three paths of heat transfer are completely blocked, heat can be preserved for a long time.

? Vacuum. Connect the tail pipe of silver-plated double-layer bottle blank with vacuum system and heat it to 300 ~ 400℃ to promote the release of various adsorbed gases and residual moisture from glass. At the same time, when the vacuum degree of the interlayer space of the bottle liner reaches 10-3 ~ 10-4 mmhg, the tail pipe is sealed with a vacuum pump. This fire extinguishing process requires gradual cooling and constant temperature testing. In the past, teachers and students needed to walk around day and night and carefully stare at the temperature of the instrument. You can't touch the temperature until the last time. Otherwise, if the pressure in the bottle can't be reached, the external force will explode and the quality will be uniform before it can be released. This is a unique skill.

? I just know that this pair of thermos bottles, which carry parents' expectations for their daughter's wedding leave, have been durable for many years and have never been replaced.

? Hot water bottles used to be a necessity in our daily life. I also witnessed the story of the transition from being a wife to being a mother in obscurity; It also witnessed the day when 10 was pregnant and gave birth to a child, and the adopted son went to college; At the same time, it also witnessed 25 years of husband and wife sharing weal and woe; Also witnessed the story of her family. Like a pair of friends who can't talk, they are on and off, gathering less and leaving more, and going their separate ways, but they have become an indispensable object memory in the symphony from their parents' home to my home. The wheel of history and the changes of the times make the lost years gone forever. But the story of the thermos bottle has passed for decades, and the scene when she got married seems to be yesterday. Dressing up in front of the mirror, I repeated the ardent expectations of parents for their children when people reached middle age. The past is vivid, but it will always be in my heart. I can't let it leave my eyes. Tears of missing silently tick on the thermos lid, making a plop sound, leaving a mark to witness every day of my life.