The degradable material developed by the company belongs to the polyester polymer. The lactic acid can be extracted from sugar liquid fermented from sugar beet and undergo ring-opening polymerization to form polylactic acid. Polylactic acid and commonly used polystyrene, polypropylene and other packaging materials have similar physical properties, and have good moisture, grease and airtightness. Polylactic acid is stable at room temperature, but it decomposes automatically when the temperature is higher than 55°C or under the influence of oxygen and microorganisms. The decomposition of polylactic acid is divided into two stages: first, pure chemical hydrolysis into lactic acid monomer, and then the lactic acid monomer is decomposed into carbon dioxide and water by the action of microorganisms. The food cup made of polylactic acid can be completely decomposed in 60 days, and it truly achieves both ecological and economical effects.
A bookcase, or bookshelf, is a piece of furniture with horizontal shelves, often in a cabinet, used to store books or other printed materials. Bookcases are used in private homes, public and university libraries, offices and bookstores. Bookcases range from small, low models the height of a table to high models reaching up to ceiling height. Shelves may be fixed or adjustable to different positions in the case. In rooms entirely devoted to the storage of books, such as libraries, they may be permanently fixed to the walls and/or floor.
A bookcase may be fitted with glass doors that can be closed to protect the books from dust or moisture. Bookcase doors are almost always glazed with glass, so as to allow the spines of the books to be read. Especially valuable rare books may be kept in locked cases with wooden or glazed doors. A small bookshelf may also stand on some other piece of furniture such as a desk or chest. Larger books are more likely to be kept in horizontal piles and very large books flat on wide shelves or on coffee tables.
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