Rotational Molding on Hedstrom Plastics

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	Rotational Molding
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Rotational Molding
The rotational molding process forms plastic materials into useful articles by 2 axis rotation of the mold through heat and cooling cycles. Ideally suited to hollow, virtually stress-free parts, part size options range from less than 1 pound to parts weighing hundreds of pounds. Hedstrom Plastics currently manufactures quality products that span both ends of this part weight range. We maintain various machine sizes to accommodate custom molding of small to large parts.
Critical to the production of quality rotational molded parts is proper mold design. Generally, cast aluminum or machined aluminum are the molds of choice, but electroformed and fabricated steel and aluminum molds are also utilized. Hedstrom Plastics contracts with experienced mold makers, overseeing the mold build from start to finish. We then furnish in-house mold maintenance for routine inspection and general upkeep allowing for timely scheduling and long term productivity from all types of molds.
You will discover that the mold construction costs are significantly less than many other plastic processes. The rotational molding process does not form the parts by forcing the material into a shape, it forms an even wall, durable part layer by layer during the heated rotation cycle. There are no extreme molding pressures involved, consequently the mold construction time is less and simplified.
Depending on the needs of your application and your unique specifications, Hedstrom Plastics can incorporate the following technology into your next rotational molding project.

Product and mold design assistance

Molded in thread inserts, molded threads, or spin weld fittings

Structural ribbing, surface textures, mold in lettering

Permanent graphic labels

Secondary finishing and assembly, trimming, drilling

CNC programmed routering

Individual packaging or bulk pack

Polyurethane foam filling of molded parts for flotation, insulation, sound baffling or rigidity

Tight tolerance parts when specified

Specifications · Support Services · Equipment List

Specifications

Material Catagories That Are Available For Use:		Low density, high density, cross-link polyethylenes PVC Plastisol/Powder Polypropylene Production regrind Polyethylene EVA Nylons Thermoplastic Urethanes Thermoplastic Polyesters

Certifications		FM57564 ISO 9001:2000 Certified

Industries Where Rotational Molded Products Are Widely Used:		Toy/Sport/Playground Specialty Furniture Marine/Recreational Automotive/Transportation Lawn and Garden Medical/Hospital/Health Care Fuel/Chemical/Water Tanks and Basins Food Processing FDA Requirements Retail Displays Commercial/Agriculture

Preferred Drawing Submission		AutoCAD Pro-E Paper

Support Services

Review of your project for rotational molding will begin immediately from first contact with our experienced team of sales / engineering / production staff / product technicians / customer service. You can expect full explanations and attention to design suggestions, material choices and expected end results.
Computer aided design programs and production staff in place allow us to assist in design development and quickly target any problem areas and offer viable solutions based on understanding of the process, and desire to provide you a durable, cost effective product. Auto-cad, pro engineer, and surf-cam programs are in use.
We utilize a technical process team approach, reporting on mold sampling and materials, establishing and recording process results as process instructions are developed for production.
We also have established customized quality assurance programs (ISO 9001-2000) with product review meetings, first article sign off procedures, production planning and review on a continual basis to maintain in-line costs and quality requirements.
Production capacity is also supported by continual operator training, group leader set-ups, and shift supervisor advisory teams.
Material handling areas are provided for high intensity color mixing, pulverizing, re-grinding, incoming material inspections, re-formations, material conveying, supply forecasts, and storage programs in both polyethylene and PVC.
In-house mold maintenance personnel with metal repair experience and processing knowledge to extend mold and fixture life, maintain routine scheduling and retain mold hishtory maintenance on high usage molds.
Shipping, warehousing, and packing information under department reviews for best methods of economical and prompt deliveries. Drop shipment distribution programs available for large volume accounts.

Equipment List

11 rotational molding machines

(5) - 3 arm machines 800 pound capacity per arm

(3) - 3 arm machines 1500 pound capacity per arm

(1) - 3 arm machine 2200 pounds per arm

(1) - 3 arm machine 2800 pounds per arm

(1) - 4 arm machine 2800 pounds per arm

5 axis CNC twin table router

Liquid color and dry color blending equipment

Polyurethane foam filling equipment

Plastic pellet pulverizers - 100 pounds per hour average

All auxilliary equipment to support production on a 24 hour 5 day week basis (routers, saws, fixtures, plastic welders, material dispensers)

150,000-pound capacity polyethylene storage silo storage system

150,000 pound PVC plastisol storage tanks / compounding area

BSI Registered FM57564 ISO 9001 2000 Certified

Rotational Molding

Material Catagories That Are Available For Use:

Certifications

Industries Where Rotational Molded Products Are Widely Used:

Preferred Drawing Submission