Materiali tecnici e rivestimenti superficiali
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Materiali tecnici e rivestimenti superficiali

Materiali tecnici e rivestimenti superficiali


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About the Book

L'uso più antico di adesivi è stato scoperto in Italia centrale, quando sono state rinvenute due scaglie di pietra parzialmente ricoperte di catrame di corteccia di betulla e una terza pietra scoperta risalente al Pleistocene medio (circa 200.000 anni fa). Si ritiene che questo sia il più antico uso umano scoperto di pietre rivestite di catrame. L'adesivo di betulla e catrame è un semplice adesivo monocomponente. Sebbene siano abbastanza appiccicosi, gli adesivi di origine vegetale sono fragili e vulnerabili alle condizioni ambientali. Il primo utilizzo di adesivi composti è stato scoperto a Sibudu, in Sudafrica. Qui, segmenti di pietra risalenti a 70.000 anni fa, un tempo inseriti in asce, sono stati scoperti ricoperti da un adesivo composto da gomma vegetale e ocra rossa (ossido di ferro naturale): l'aggiunta di ocra alla gomma vegetale produce un prodotto più forte e protegge la gomma dalla disintegrazione in condizioni di umidità. La capacità di produrre adesivi più forti ha permesso agli esseri umani della media età della pietra di fissare segmenti di pietra a bastoni con maggiori variazioni, il che ha portato allo sviluppo di nuovi utensili.


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Product Details
  • ISBN-13: 9786205767870
  • Publisher: KS Omniscriptum Publishing
  • Binding: Paperback
  • Language: Italian
  • Returnable: N
  • Weight: 168 gr
  • ISBN-10: 6205767872
  • Publisher Date: 07 Mar 2023
  • Height: 229 mm
  • No of Pages: 72
  • Spine Width: 4 mm
  • Width: 152 mm


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