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(詳細はplastics to identify the polymer type. It was developed by the Society of the Plastics Industry (SPI) in 1988 and is used internationally. The primary purpose of the codes is to allow efficient separation of different polymer types for recycling. Separation must be efficient because the plastics must be recycled separately. Even one item of the wrong type of resin can ruin a mix. The symbols used in the code consist of arrows that cycle clockwise to form a rounded triangle and enclosing a number, often with an acronym representing the plastic below the triangle. When the number is omitted, the symbol is known as the universal Recycling Symbol, indicating generic recyclable materials. In this case, other text and labels are used to indicate the material(s) used. Previously recycled resins are coded with an "R" prefix (for example, a ''PETE'' bottle made of recycled resin could be marked as ''RPETE'' using the same numbering). These codes do not indicate how hard the item is to recycle, nor how often the plastic may be recycled. It is an arbitrarily agreed upon code that has no other meaning aside from identifying the polymer used in manufacturing the specific plastic to facilitate future recycling of the plastic. The Unicode character encoding standard includes the resin identification codes, between code points U+2673 and U+2679 inclusive in the Miscellaneous Symbols block. The generic material recycling symbol is encoded as code point U+267A. ==Table of resin codes== Source:〔(【引用サイトリンク】title=Plastic Packaging Resins )〕〔(【引用サイトリンク】title=What Do Recycling Symbols on Plastics Mean? )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Resin identification code」の詳細全文を読む スポンサード リンク
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