WHAT IS THE WELD LINE? When two or more plastic streams meet at different temperatures as the plastic is filling the mold cavity, the two streams may not correctly mix together. When this happens, it forms a weld line. These are indicated in the following pictures: The Reasons and Solutions...
The invention relates to a method for welding laminate-like packaging materials (4a, 4b, 5) which have a plastic material on the surfaces to be joined by welding, without contacting said surfaces with welding tools. To be able to interrupt the welding abruptly and resume it thereafter without...
Use rough surfaces to disguise the weld line We’ve covered the main areas that designers should apply to plastic injection molded parts in this article. Of course, since every project is unique, you should work closely with your manufacturing partner to find realistic solutions to help you meet...
This type of glue isn’t a surface coating; it’s a PVC solvent that actually melts plastic. When you spread this glue on a pair of pipes and join them, the melted plastic of both pipes hardens into a single piece. This makes trying to unglue a joint a bit like trying to unbake a...
11. Weld a nut to the screw’s head. Photo: Tom Fenenga for Bob Vila If you’reexperienced with weldingand have the necessary equipment on hand—and youreallywant to remove that pesky stripped screw—here’s a last-ditch effort you can make: Spot-weld a nut to the top of the screw...
PVC primer starts a chemical reaction that softens the PVC and washes away residue from the plastic surface. Primer reduces the chances of poor bonding between the PVC parts. Primer is typically dyed purple. This makes it easy for plumbing inspectors to see if primer was used on a home’s ...
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Use good-quality, high-strength, long-cure epoxy (e.g., JB Weld),notel-cheapo 5-minute epoxy from the Dollar Store. LET THE EPOXY COMPLETELY CURE BEFORE MESSING WITH IT! Just walk away from it for a day… (your patience will be rewarded). ...
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