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Thin Wall Molding

Thin wall molding is a specialized form of conventional injection molding that focuses on mass-producing plastic parts that are thin and light, without structural compromise, in order to achieve material cost savings and shorter cycle times. Faster cycle times improve productivity and lead to lower costs per part.

MHS offers specialized solutions for thin wall packaging applications including compact stack molds for lightweight containers featuring back-to-back Rheo-Pro® iVG™ internal valve gate technology

The definition of thin wall is really about the size of the part compared to its wall thickness. For any particular plastic part, as the wall thickness is reduced, the harder it is to manufacture using the injection molding process. The size of a part puts a limit on how thin the wall thickness can be. For packaging containers, thin wall means wall thicknesses that are less than 0.025 inch (0.62mm) with a flow length to wall thickness ratio greater than 200.  

iVG™ internal valve gate nozzles for back-to-back stack mold applications are clean, compact, and maintenance free

In-Mold Labelling (IML)

In-mold labelling is a popular method of decorating injection molded parts for plastic packaging, consumer electronics, and other products. Computer, cellphone, and automobile manufacturers are increasingly adopting IML technology for its functionality, appearance, and greater wear resistance compared to spray painting or pad-printing. In automated, high speed production environments, IML can provide better decorating options than other manufacturing methods.

Long, slender valve gate nozzles enable gating through the core side of the mold by providing enough space for effective core cooling in thin wall IML applications, resulting in extremely fast cycle times.


Mobile telecommunications and computer manufacturers are also placing a greater emphasis on the lightweighting of plastic components in mass produced products.


Plastics play a critical role in delivering new design possibilities and miniaturization for electronic devices



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Large Thin Wall Parts

Thin wall injection molding does not only apply to lightweight food packaging. With the proper part design, analysis, and hot runner system, large plastic parts can benefit from substantial weight reduction and materials savings while maintaining their functionality and strength. Industries that are applying this technology in order to improve existing plastic parts or replace components made from other materials such as metal are automotive, aerospace, logistics, construction, and appliances.

Injection molded refrigerator liner with 1.0 mm wall thickness. New hot runner technology available for thin-wall molding can replace manufacturing processes like thermoforming by producing superior plastic parts with zero scrap rate and 100% reliable automation.

Hinged 94 drop Rheo-Pro® Slide™ manifold system for extremely large, lightweight PP part with a thin wall thickness featuring valve gates in the moving mold slides on all 4 side walls. The 49 injection zones are controlled by a Rheo-Pro® CV-ST sequence/temperature controller.


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MHS is a global supplier of hot runner systems, injection molding machines, controllers, and engineering support for manufacturers of plastic parts.