مرحبًا بك إلى بنك الأسئلة، حيث يمكنك طرح الأسئلة وانتظار الإجابة عليها من المستخدمين الآخرين
0 تصويتات
في تصنيف رياضة بواسطة (280 نقاط)

Paper is a thin sheet material produced by mechanically or chemically processing cellulose fibres derived from wood, rags, grasses or other vegetable sources in water, draining the water through fine mesh leaving the fibre evenly distributed on the surface, followed by pressing and drying. Although paper was originally made in single sheets by hand, almost all is now made on large machines—some making reels 10 metres wide, running at 2,000 metres per minute and up to 600,000 tonnes a year. It is a versatile material with many uses, including printing, packaging, decorating, writing, cleaning, filter paper, wallpaper, book endpaper, conservation paper, laminated worktops, toilet tissue, currency and security paper and a number of industrial and construction processes. The papermaking process developed in east Asia, probably China, at least as early as 105 CE, by the Han court eunuch Cai Lun, although the earliest archaeological fragments of paper derive from the 2nd century BCE in China. The modern pulp and paper industry is global, with China leading its production and the United States following.

The paper bowl is a kind of paper container made by mechanical processing and bonding of the base paper (white cardboard) made of chemical wood pulp, and its appearance is bowl-shaped. Waxed paper cups for frozen food, can hold ice cream, jam and butter, etc. Paper cups for hot drinks are coated with plastic, resistant to temperatures above 90°C, and can even bloom with water. The characteristics of paper bowls are safe, hygienic, lightweight and convenient. It can be used in public places, restaurants, and restaurants, and is a one-time item. Since the advent of paper bowls, it has quickly become the most viable green tableware in the 21st century. Internationally renowned fast food chains such as McDonald's, KFC, Coca-Cola, Pepsi and various instant noodle products have adopted disposable paper bowls.

The first hygienic feature is the composition of the inner wall of the paper bowl. The reason why the paper bowl can hold water is because the inner wall of the paper bowl is coated with a layer of polyethylene water barrier film, but if the selected material is not good or the craftsmanship is not good enough. This substance may be oxidized to its volatile carbonyl compound. This substance has a strange smell, and long-term intake of this substance is very harmful, especially some small factories are still using the prohibited recycled polyethylene water barrier film; The second hygienic property of paper bowls is its degradability. An industry insider said that paper bowls not only consume resources, but also impose a great burden on the environment. Moreover, due to the convenience of paper bowls, some people throw them away after use, which not only destroys the appearance of the city, but also brings great pressure to the sanitation work. Therefore, when choosing paper bowls, we must choose paper bowls made of degradable materials, and dispose of them properly after use.

إجابتك

اسمك الذي سيظهر (اختياري):
نحن نحرص على خصوصيتك: هذا العنوان البريدي لن يتم استخدامه لغير إرسال التنبيهات.
مرحبًا بك إلى بنك الأسئلة، حيث يمكنك طرح الأسئلة وانتظار الإجابة عليها من المستخدمين الآخرين.

اسئلة متعلقة

0 تصويتات
0 إجابة
سُئل يونيو 23 في تصنيف رياضة بواسطة as852149 (300 نقاط)
0 تصويتات
0 إجابة
سُئل منذ 1 يوم في تصنيف رياضة بواسطة as852159 (300 نقاط)
0 تصويتات
0 إجابة
سُئل منذ 1 يوم في تصنيف رياضة بواسطة as852159 (300 نقاط)
0 تصويتات
0 إجابة
سُئل منذ 1 يوم في تصنيف رياضة بواسطة as852159 (300 نقاط)
0 تصويتات
0 إجابة
سُئل منذ 1 يوم في تصنيف رياضة بواسطة as852159 (300 نقاط)
...