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最近在紐約時報看到一則Q&A是跟回收紙有關的介紹,在此分享:

 


 

 

Q: 請問紙張最多可以回收幾次?

 

 

A: 根據紙廠統計,基本上一張紙可以被回收4~6次,但是美國環保署發佈的資料是5~7次。

 
紙張每次被回收重新製作時,都會對紙張的纖維破壞一次。

 
最理想的情況是,每一種不同的紙張都被分別回收;長纖紙張(如辦公室影印紙)能回收再製作成較好的紙,而報紙(短纖)回收後最多只能再做成報紙或是更低階的紙種(例如紙箱)。


回收的過程中,紙張被撕碎、攪爛,加入化學藥劑和水加熱,接著去除雜質,再加入更多的化學藥劑脫墨。接著被放在網子上瀝乾水分,最後再通過高溫的捲筒烘乾。

 

以上的每一個步驟都會使紙漿中的纖維變得更短、更粗糙脆弱,最終則不得不加入原生漿來製造出一定品質的紙張。


根據「美國森林與紙張協會」指出,2009年全美有63.4%的使用後紙張被回收再利用。

 



以下是紐約時報的原文:

 

 

Q. Is there a limit to how often paper can be recycled? 

A. Some industry sources estimate that an ordinary sheet of paper made from cellulose fibers derived from wood can survive only four to six trips through the recycling process. The Environmental Protection Agency puts the figure at five to seven times.

It is not surprising that the rigors of remanufacturing take a toll on the fibers.

Ideally, paper for recycling is separated into types, because paper with long fibers, like white office paper, offers the most flexibility for recycling, while newsprint, with its shorter fibers, is usually reserved for making more newsprint and other low-quality papers.

The paper is shredded and chopped, then subjected to a mixture of chemicals and water and heated as it is repulped. It is centrifuged and screened to remove impurities; de-inked with more chemicals; then sprayed onto a wire screen, drained, dried and squeezed through heated rollers.

With each step, the fibers become shorter, coarser and stiffer, so that eventually, recycled fiber needs to be mixed with virgin fiber to make paper of the desired quality.

According to the American Forest and Paper Association, 63.4 percent of the paper consumed in the United States was recovered for recycling in 2009. C. CLAIBORNE RAY

 

原文出處:http://www.nytimes.com/2010/12/21/science/21qna.html?_r=1&ref=earth

以上文字由大鄴企業整理,未經同意,請勿轉載。