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Spotlight on Mold-Rite Plastics: What should top your product?

What should top your product?

Mold-Rite Plastics has always been extraordinarily popular due to the wide array of closure options it offers. The company has been a part of a number of projects over the years, and its involvement in the food industry has been prolific, with everything from dispensing tops to large, wide-aperture closures dedicated to nutraceuticals and other powered products.

Over the years, materials have evolved to a point where we have more types of safe material available for closures than ever before.

Different materials offer different benefits, whether speaking of metal, glass, plastic, wood, textiles, or all sorts of others. Plastic, however, has become the de facto king of closures, for a wide variety of reasons. Mold-Rite only works with high quality materials to ensure the best results and safety for companies and by extension for the consumers that are their clients.

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Low Density Polyethylene

Often simply referred to as LDPE, this thermoplastic has been around since the 30s. In modern usage, we can find LDPE in a number of applications, though with regard to food, some of the more common ones are as transparent deli trays, six-pack rings, brick packaging lamination, and of course, closures of all sorts. LDPE has become a successful material not only for its versatility in packaging and manufacturing, but because it provides excellent resistance to both acids and bases, as well as alcohols. It also offers fairly good resistance to vegetable and mineral oils.


Curiously, PP was invented in the 50s by two separate teams of scientists and engineers that had no connection to each other, one in Italy and the other in the USA. Since then, use of PP has grown enormously, making it the largest volume commodity thermoplastic currently on the market, accounting for about 19% of all plastic manufactured. Many of the closures offered by Mold-Rite use PP as a base, especially those that are hard and require precision. In general, you're going to use PP when you need something hard, resistant, and that can stand up to a wide range of temperatures.

What you should know about materials
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There's really no such thing as the exact right closure or material for all products. Hence, Mold-Rite has developed an incredibly wide array of caps, tops, lids, and more. The goal is to satisfy just about any sort of closure requirement, within the food sector or beyond in others like pharmaceuticals and cosmetics. There are actually a number of things that Mold-Rite takes into account prior to recommending the best closure for the job

Closure Compatibility

This is the general concept of how well a closure or container can cope with the product held. Some plastic compositions can react chemically or break down when in contact with other compositions, like oils, acids, bases, and others. The closure not only needs to be able to withstand the product, it also needs to remain clean and pristine, without tainting what it contains. Plastic can leach, meaning it can loose chemicals into the product little by little while it's stored. That's why it's important to match the closure material with a product, to ensure this sort of thing doesn't happen.

Closure Design

As manufacturing techniques improve to meet consumer demand, closures are keeping up with the times, becoming more complex. A great example are ketchup or mustard closures. First, we had the standard screw top on a bottle, but some people found it difficult to get the product out. Then we had squeeze-tops, with a ratcheted top to allow the product to shoot through a nozzle tip. Thanks to Mold-Rite, we now have closures which feature a liquid-trap on the inside, which catches water that has separated from the product and ensures you don't get your condiment spattered all over the table.

Closure Security

Foods, by and large, don't require heavy security measures like pharmaceuticals or household cleaning products. However, the concept of security isn't just a question of keeping people OUT, it also means keeping the product securely IN. The last thing a consumer wants is to have his or her product get out and spill into a shopping bag en route.

Closure Fit

There are a number of international standards for defining the sizing of closures to ensure they fit perfectly on bottles and jars. Companies like Mold-Rite spend a lot of time and attention making sure they create molds to produce components that conform to standards and work precisely. Just take a look at the name of the company and you'll see how important getting the right mold is.

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Four things to know about closures
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All of these things need to be taken into account prior to selecting a closure, especially for products that are as sensitive as foods. Companies that have experience purchasing know the right questions to ask and Mold-Rite handles a lot of orders for firms that know precisely what works and what doesn't. For those that are unsure or need guidance, Mold-Rite also offers development assistance to ensure products get the exact closure they require.

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  • Modified 20 Dec 2016
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