Rotomolders around the world are in search of reduced scrap rates, production efficiency and improved product quality, right? If not, then they should be. Common problems that occur in rotomolding are mold parting line failures, which can include mismatched parting lines or mold parting lines that may be damaged in a way that starts to leak out resin during molding and leave voids or gaps when finishing a product. This can obviously spell disaster, increased scrap rates and loss of profits for molders.

How To Solve Parting Line Issues When RotomoldingIf you haven’t heard of it, or have only turned directly to spending the money on full mold replacements, then this resin retention technology could help you save some money and time. The roto sealant technology from Mold In Graphic Systems® was created to help rotomolders in this area and to be the easy go-to-solution for parting line issues.

Discovering PL-S® for Parting Line Issues

The first product of the Surface Enhancer® product line was Surface Enhancer® 360 for resin flow correction. This resin flow correction led to the innovation of PL-S® Parting Line Sealer which corrects, seals and smooths out parting line issues caused by mold problems. Completely sealing those gaps and voids, saves on the lost resin and has saved on mold replacement cost.

Molds for boats were some of the particular problems. Imagine the resin loss and shaping issues that could occur on that size of a finished product!  The need is prevalent in these scenarios for a parting line solution that would also be made out of the same material as the finished boats to ensure a permanent seal was created. That is what PL-S does for boats and polyolefin based products.

The Mold in Graphics R&D team worked on the idea with PL-S Parting Line Sealer, to be applied easily to a mold through the use of caulking guns. This made fixing parting lines more readily available to molders. The PL-S pliable compound resists flow at high temperatures when molding, making it retain its position in the mold and sealing up gaps or voids as it fuses into the outer skin of the part. When the part is finished, any excess PL-S material is easily trimmed away using standard flashing tools. Since its innovation, PL-S has helped many companies lower their scrap rates and retooling costs.

How To Solve Parting Line Issues When RotomoldingGough Plastics, located in Queensland Australia, is a family owned manufacturing business that makes water storage tanks, waterless toilet systems, durable storage containers, underbody tank gear, cattle feed troughs and more. Gough Plastics have used PL-S during their molding process and relate using PL-S as to removing the hassle.

Simon Gough from Gough Plastics states, “The part was a three-layer, skin-foam-skin product. We were having hassles with foam blowing bubbles at the parting line. This resulted in as high as 15% scrap rate. No matter how many bolts, etc. we used, we could not stop the problem. This is a low-run part (50 per year) and the customer was very reluctant to rebuild or build a new tool. PL-S Parting Line Sealer on the bonnet mould made the difference between telling our customer we no longer want the job and running the part with minimum hassles.”

How To Solve Parting Line Issues When RotomoldingAt Mold In Graphic Systems, we take pride in helping others solve their molding issues. Solving your rotomolded part issues is simply a choice to do so. But finding the right tool to get the job done can only be resolved by one of the many Surface Enhancer products from Mold In Graphic Systems, like PL-S. To learn more on the specifics of PL-S Parting Sealer or about these original Surface Enhancer problem solving technologies, click here.

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