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Gravimetric Metering System in Operation

Riverdale Global ‘Frees the Customer from Every Complication of Handling Liquids’ and Offers Enhanced Products that Save 20 to 40% in Colorant Costs versus Pellet Concentrate

PERTH AMBOY, NJ, U.S.A., June 6, 2013: Riverdale Global, a new company formed to provide plastics processors in the U.S. and overseas with highly localized service for liquid colors, promises to completely eliminate the handling problems associated with liquids, supplying high-quality, consistent colors regardless of location and providing full access to the cost advantages of liquids over pellet concentrate or masterbatch, the company announced today.

Riverdale Global is establishing a network of satellite operations in the U.S. and abroad to make readily available its technologies for producing, delivering, metering, and replenishing liquid colors. “Our technologies enhance the quality and repeatability of liquid color, increase its cost advantages over concentrate, free the customer from every complication of handling liquids, and reduce their environmental impact,” said Steve Maguire, co-owner of Riverdale Global and president of Maguire Products, Inc.

One of the technologies utilized by Riverdale Global is the Pump-in-a-Drum (PIAD)™ system, developed by Maguire Products and long employed by affiliate company Riverdale Color. The PIAD keeps liquid color sealed off from the workplace before, during, and after its use by the customer. “By utilizing a system in which the customer never sees a drop of liquid color, Riverdale Color overcame the one big obstacle to switching from concentrate—the messiness and complication of handling liquids,” said Mr. Maguire. “This opened the door to the substantial cost savings per unit of finished product that liquid color offers in comparison with concentrate, and we intend to offer local access to these savings for customers served by our satellites.”

Although liquid color typically costs more per pound than pellet concentrate, it contains higher pigment loadings, is used at lower addition levels, takes up much less warehouse space, and makes possible shorter cycle and purging times. Two more technologies available through Riverdale Global—Riverdale Color’s Single Pigment Dispersion (SPD)™ system and a new gravimetric metering device developed by Maguire Products—add to this cost advantage by producing higher-quality colors and metering them into the processing machine with greater accuracy, according to Mr. Maguire. “The combination of SPD-based colors and gravimetric dispensing enables customers to save 20 to 40% on colorant costs alone,” he said. “Added to this are the savings that we have made possible by streamlining the entire process of delivering, storing, using, and returning the containers of our colorants.”

A Unique System for Producing, Delivering, Metering, and Replenishing Liquid Colors

Founded by principal owners of Riverdale Color Company and Maguire Products, Inc., Riverdale Global has created a system with four critical components:

---Satellite operations whose services are limited to customers within a narrow radius, providing fast, customized support, ready access in the event of emergencies, and the opportunity for customers to reduce inventories. There are already two such operations in the U.S. (Perth Amboy, NJ and Statesville, NC), one in the United Kingdom (Tamworth, Staffordshire), and another in Russia (Moscow). The company plans to open more satellites, each equipped with proprietary systems for color blending and matching.

---Single-Pigment Dispersion (SPD)™ technology, developed and long employed by Riverdale Color. While the conventional method of manufacturing liquid color is simply to add pigments one at a time to a liquid carrier and then blend them, Riverdale Color disperses only one pigment in liquid, then mills this dispersion to maximize color strength, brightness, and uniformity. As a result, processors using colorants based on SPDs can achieve full color at lower let-down rates than with conventional liquids. The SPDs are produced at one location only—company headquarters in Perth Amboy, NJ, U.S.A.—and inventoried at Riverdale Global satellite locations, where they are blended to match customer specifications. Additives can be included in blends along with colorants. Because of this ‘single-sourcing’ of SPDs in Perth Amboy, multinational customers are supplied with precisely the same colors at multiple plant locations.

---‘Never See a Drop’ Color Delivery System. Building upon and enhancing the PIAD concept, Riverdale Global has developed a total system in which liquid color is sealed off from any contact with the workplace or environment. The company has improved the color pump, added sealed delivery tubes, no-drip adaptors, a loss-in-weight scale, and microprocessor controls. The pump is permanently installed inside a standard-size drum that stays sealed from the moment it leaves the Riverdale Global loading dock to its return from the customer. During processing, the PIAD meters color through a sealed tubing assembly, with automatic shutoffs preventing spillage. By returning the drum to Riverdale Global, the processor avoids the problem of discarding it. Riverdale Global takes responsibility for pump maintenance, tubing replacement, and other color-handling logistics. Because the company refills used drums for any repeat order of a given colorant, the typical 1 to 3% residual content left in a drum is not lost.

---Gravimetric liquid color metering. Newly developed by Maguire Products, this enhancement to the PIAD system holds color-delivery tolerance to within 0.1%, preventing over-coloring and making it possible to reduce color costs while maintaining target color levels. Among the components are a scale for loss-in-weight monitoring of drum contents and a new controller for pump operation. In injection molding, for example, the operator simply enters into the controller the target shot weight and letdown ratio. The controller automatically maintains accuracy after determining cumulative error over a number of cycles. The metering equipment is supplied and maintained by Riverdale Global, eliminating customer investment in capital equipment.

Preventing Environmental Problems Posed by Residual Colorant and Containers

The gaylord or octobin containers commonly used for concentrate are too bulky for easy reclaim and often end up in landfills; sometimes, too, residual pellets are left inside, causing a dual environmental problem. In standard liquid color containers, residual colorant also poses a problem, since even the most efficient liquid color dispensing system leaves behind some amount in supposedly “empty” drums. In the Riverdale Global system, however, both drums and their residual contents are returned to the satellite provider.

Riverdale Global combines the formulating expertise of Riverdale Color, which has supplied liquid color for 35 years, with the equipment know-how of Maguire Products, which got its start as a company when it introduced the first successful pump for liquid colors. “The Riverdale Global system is the most important improvement in liquid color delivery since I developed the liquid color pump in 1977,” said Steve Maguire. “Now our customers can have truly uniform color that is available on a worldwide basis and provided in a way that is completely clean for the workplace and the environment.”

Photo Caption: At right in the photo is the gravimetric metering system for liquid color supplied by Riverdale Global. Three of its components are, from top to bottom, 1) controller developed by Maguire Products, Inc.; 2) sealed Pump-in-a-Drum system developed by Riverdale Color and enhanced by Riverdale Global; and 3) scale for loss-in-weight monitoring of color dispensing.


RIVERDALE COLOR is a leading international supplier of liquid colorants and additives to the plastics industry whose products are used in consumer and commercial markets for toys, personal care items, packaging, and outdoor furniture. The company’s world headquarters is in Perth Amboy, New Jersey, U.S.A. In Latin America, Riverdale has offices in Mexico, Guatemala, and Colombia, as well as Puerto Rico. Other international offices are based in the United Kingdom, Singapore, and China. The Riverdale legacy dates back to the early 1900s as a supplier of dyes and industrial chemicals. Email: Visit

MAGUIRE PRODUCTS, INC., headquartered in Aston, Pennsylvania, U.S.A., is the world’s largest supplier of gravimetric blenders, liquid color pumps, and vacuum dryers and also manufactures loading systems, auger feeders, granulators and related equipment and software. Its customers include injection, blow, and rotational molders, extrusion processors, and compounders. Founded in 1977, Maguire operates six manufacturing facilities in Aston. The company maintains a network of distributors in the Americas and overseas and has three sales and service subsidiaries that stock, sell, and service auxiliary equipment systems from Maguire and its affiliate, Novatec, Inc.: Maguire Canada, Maguire Europe, and Maguire Asia. Visit