{"id":4701,"date":"2026-08-06T10:53:18","date_gmt":"2026-08-06T08:53:18","guid":{"rendered":"https:\/\/hamco-germany.com\/?post_type=fachbegriff&p=4701"},"modified":"2026-08-07T10:46:44","modified_gmt":"2026-08-07T08:46:44","slug":"water-marks-and-water-droplets","status":"publish","type":"fachbegriff","link":"https:\/\/hamco-germany.com\/en\/fachbegriff\/ablaufspuren-und-ablauftropfen\/","title":{"rendered":"Drain marks and drain drops"},"content":{"rendered":"

Terminology of plastics technology - humorous and easy to understand<\/strong><\/p>\n

Did you know that in many cases, comparisons with nature and humans can be used to explain facts in plastics technology?<\/p>\n

Today's term: Drain marks and drain drops<\/strong><\/p>\n

\u201eGravity makes no distinction between honey and PVC.\u201c<\/strong><\/p>\n

Have you ever taken a spoon out of a jar of honey?<\/p>\n

At first, the honey clings evenly to the spoon. But after just a few seconds, it begins to flow slowly downwards. This creates fine streaks, and the famous last drop eventually collects at the lowest point.<\/p>\n

That is exactly how it behaves the plastisol <\/span>in the manufacture of dip-moulded parts from viscous PVC.<\/p>\n

Once the heated dip core has been removed from the PVC dip bath after the product-specific dwell time has elapsed, an even, still-flowable layer of plastisol adheres to the surface of the PVC that has already set, which will form the eventual wall thickness. However, the material remains flowable for a short time until it has fully gelled and set in the hot oven. During this time, the excess PVC \u2013 just like honey \u2013 follows the laws of gravity.<\/p>\n

Depending on the geometry of the part being dipped, visually detectable Traces of runoff<\/a> result from the PVC sticking to the surface, with slightly more material accumulating at the lowest point and forming a Drip from the drain<\/strong> form.<\/p>\n

Neither of these is a manufacturing fault, but rather entirely natural side effects of the PVC dipping process and the result of a law of physics \u2013 after all, gravity makes no distinction between honey and plastic.<\/p>","protected":false},"featured_media":4700,"parent":0,"template":"","class_list":["post-4701","fachbegriff","type-fachbegriff","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"https:\/\/hamco-germany.com\/en\/wp-json\/wp\/v2\/fachbegriff\/4701","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hamco-germany.com\/en\/wp-json\/wp\/v2\/fachbegriff"}],"about":[{"href":"https:\/\/hamco-germany.com\/en\/wp-json\/wp\/v2\/types\/fachbegriff"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hamco-germany.com\/en\/wp-json\/wp\/v2\/media\/4700"}],"wp:attachment":[{"href":"https:\/\/hamco-germany.com\/en\/wp-json\/wp\/v2\/media?parent=4701"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}