Aluminum / Metal

New Ways to Mix Metal and Plastic

Posted: March 6, 2007

Metal packaging from Siloa, Inc. solves a double challenge—exciting the consumer with a stylish upscale metal presence while satisfying supply chain and production initiatives for availability, ease in filling and affordable price points. Siloa sets high-luster metal into, around, or on top of durable yet low-cost plastic moldings. Depending on the design and desired look and feel of the package, Siloa can highlight the metal, complement the interplay between metal and plastic, or heighten textural differences that can be developed in either or each material.

Smooth, etched, antiqued, burnished, brushed and embossed metal finishes can be achieved in almost any color. A wide range of injection molded plastic materials are used In combination with metal to achieve functional performance and aesthetic balance. Siloa engineers and develops components and coordinates project development with an exclusive group of highly qualified supply partners in different areas of Asia, each with their own unique skill sets and area of specialization. More at

RPC caps are an eye-catching metal on plastic alternative, combining advanced technology and creativity. These caps are currently creating a unique appearance of the caps for the jars and bottles in the Estée Lauder Cyber White range of skin care products. Manufactured by RPC beauté, the Cyber White caps continue the family image of the Estée Lauder Pure Color make-up range.

The new caps adhere to Estée Lauder's established brand guidelines. These include a specified metallic gold color for the closure; the combination of geometrical shapes in the finished design (a circle within a triangle); and the creation of a multilayer construction to enclose the core pack—the closure—within a thick transparent layer which acts like a magnifying glass that enhances the appearance of the closure and creates a 'jewel-like' effect.

The creation of the closures has also required an equally challenging technical response using a three material construction—incorporating ABS, surlyn and polypropylene—to overmold a plated part. RPC beauté's highly innovative solution utilizes a patented technique. The high pressure and temperature required during the overmolding process would normally damage the plated part if attempted in the traditional manner. To overcome this, RPC beauté has used a specially developed resin compound instead of traditional ABS, as well as several special processes.

The result is a higher overall visual quality for the finished closure as there is intimate contact between the plated surface and the Surlyn, which creates first-surface reflection, and better functional quality as there is no risk of miss-orientation, or any movement or separation of the two parts of the cap, even after repeated use.

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