{"id":137493,"date":"2023-10-18T12:37:23","date_gmt":"2023-10-18T12:37:23","guid":{"rendered":"https:\/\/seven-group.it\/what-is-cardboard\/"},"modified":"2025-03-04T16:21:26","modified_gmt":"2025-03-04T16:21:26","slug":"what-is-cardboard","status":"publish","type":"post","link":"https:\/\/seven-group.it\/en\/what-is-cardboard\/","title":{"rendered":"What is cardboard?"},"content":{"rendered":"<p>Cardboard is a particularly thick and heavy paper material consisting of a central corrugated layer and two flat side sheets.<\/p>\n<p>Its origins date back to 15th-century China, while the first commercial cardboard boxes were sold in England in 1817.<br \/>\nThe boundary between paper and paperboard is conventionally set at 224 g\/m\u00b2 with a thickness of at least 175 \u00b5m; the mechanical and optical properties of paperboard are specified by the ISO 5651:1989 standard.<\/p>\n<p>Type of cartons:<\/p>\n<ul>\n<li>Flat cardboard or cardboard<\/li>\n<li>Simple wave cardboard, consisting of two outer sheets and one inner corrugated sheet.<\/li>\n<li>Double wave cardboard, consisting of three sheets, two outer and one middle sheet and between them two corrugated sheets.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Cardboard is a particularly thick and heavy paper material consisting of a central corrugated layer and two flat side sheets.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[191],"tags":[209],"class_list":["post-137493","post","type-post","status-publish","format-standard","hentry","category-faq-en","tag-cardboard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is cardboard? 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