RIM DESIGN | PART DESIGN Get A Better Reaction to Your Design In general, reaction injection molding (RIM) allows for superior design in polyurethane parts – over plastic injection molding, thermoforming, and cast molding – when you require: Low cost tooling Large parts Variable part wall thickness Molded in bosses, ribs, inserts, tabs or undercuts Flexible cosmetic surface and part design Encapsulation capabilities Dimensional stability Chemical resistance In-mold painting and post-paint Back Side of Cabinet Door 7.5’x3.5’ Rigid RIM Foam, 94V-0 Molded in Ribs, Tabs, and Bosses Back Side of Large Bezel Variable Wall Thickness with NO Sink RIM MANUFACTURING WILL MATCH THE BEST SYSTEM FOR YOUR RIM DESIGN The range of polyurethane systems that reaction injection molding (RIM) allows means you can achieve your ideal characteristics of: Impact resistance Dimensional stability and strength Design tolerance Wear- and corrosion-resistance Thermal insulation Electrical non-conduction Sound absorption Natural adhesion WE WILL HELP YOU CHOOSE THE BEST RIM DESIGN PARTS Elastomeric– for RIM parts with superior impact strength, durability, dimensional stability and resistance to corrosion, abrasion and wear Solid– produces RIM parts similar to those created with thermoforming or thermoplastic systems, but these allow variation in wall thickness throughout a part without visible sink marks. Typically, minimum wall thickness is 1/8” to 1/2” Rigid Foam– a blowing agent creates a high-density skin around a low-density microcellular core. This skin gives the RIM part firmness and durability while the low-density core reduces the part design’s weight. Wall thickness can vary from 1/4” to 11/2” Flexible Foam– this system’s blowing agents create self-skinning foams. The thickness of the skin and density of the foams can be adjusted to achieve the precise flexibility, firmness and support characteristics your RIM part design requires Reinforced RIM (RRIM)– the Elastomeric system with glass or mineral fillers introduced to produce parts with greater rigidity Structural RIM (SRIM)– Solid or Foam chemistries can incorporate long-fiber reinforcements, like glass mats, to increase stiffness and impact resistance for your RIM design RIM DESIGN FACTORS TO CONSIDER RIM Manufacturing will work with you to maximize your RIM part’s design by making the ideal choice from the wide array of manufacturing chemistries and systems we offer. Together we’ll consider: Your part’s purpose Structural, impact, and load requirements Unique environmental conditions the part will be subjected to Chemicals the part will be exposed to Special design requirements to be considered Aesthetic requirements Weight requirements Particular finish, color or paint requirements Cost-reduction opportunities Telecom Door (Unique Logo Feature) Converted Sheet Metal Door 36”x36”x1” and 6 lbs Inflation System Valve Over-Molded Valve 6” x 0.5” THEN WE’LL WORK WITH YOU TO ENHANCE YOUR RIM DESIGN SPECIFICATIONS: Wall thickness & strength– we will help you select the right system and chemistry to achieve the optimal cross section for cycle time, output, and cost Ribs– usually running the length of a part, ribs can also be bidirectional to allow for thinner walls, greater strength, warp reduction, and lower cost when faster cooling reduces cycle time Draft– considered in every surface parallel to the direction of the draw, draft angle increases with part height. This is an especially important consideration for the core side of the mold since the part shrinks onto the cavity as it cools. With RIM Manufacturing, drafts can be as slight as 1° Bosses– frequently incorporated to accommodate threaded inserts, their primary benefit is allowing air to escape during molding and optimizing cycle time. This is generally most successful with bosses in side walls or gussets added to isolated gussets Holes, grooves, & vents– these features, oriented in the direction of the chemical flow, can enhance injection into the mold by reducing stress concentration, air entrapment and knit lines, especially rounded or chamfered grooves. Usually created by hand-loaded inserts or hydraulic inserts, the incorporation of holes and grooves is sometimes more cost-effective when they are drilled CONTACT US FOR QUOTE Contact Us RIM Manufacturing, LLC 901 West I-20 Weatherford, TX 76087 (817) 599-6521 contact@rimmfg.com Quick Links Home About RIM Process Design & Quality Paint and Assembly Gallery Contact Privacy Policy Downloads Part & Mold Design Guide ISO 9001:2015 Certificate ISO 13485:2016 Certificate RIM Manufacturing Brochure ©2020 All rights reserved. Site by JSL Marketing & Web Design