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To make the manufacturing process easier, Chadwicks of Bury can advise food and non-food manufacturers on selecting the appropriate materials for lids.

Heat-seal pre-cut lids are compatible for use with a range of packaging applications including containers for cream, yoghurt and ice cream, beverages, snacks, butter and margarine, as well as other non-food items.

Certain products, however, require different qualities in a lid, in addition to design variations to give it an edge.

Polyester is a standard product, available in gauge .050 with pin dot embossing and can be used for sealing to PS, PP, PET and Paper PE container types.

The advantages of using polyester as a lid material include its availability as a white surface, which provides improved graphic quality and colour definition.

As a transparent touch-clear polyester and also with a partial heat-seal lacquer, it becomes one of the most versatile materials available on the market.

What’s more, polyester is a non-metallic material that allows for end-of-line metal detection, vital in food production and testing.

Metallised polyester (MET-PET) gives the lid a metallic surface and improved barrier properties.

This widely used material provides high puncture and tear resistance, which is important for storage.

It can also be micro-perforated for easy separation of multi-pack lidding, making products very user-friendly.

Aluminium-based lidding is another standard product for sealing to all container types such as PS, PP, PE and PET.

Aluminium can provide the important advantage of providing a total barrier against water vapour and oxygen transmission, as well as light and aroma.

This therefore makes it an ideal choice for sensitive and extended shelf life products.

Available in gauges .029/.037/.048 /.060, its metallic properties can be used as an aesthetic feature of the lid design and logos can also be embossed, as well as featuring standard patterns such as random grub and fine linen.

Aluminium with heat-seal lacquer is primarily used for short shelf life products such as yoghurt, yellow fats, cream, and so on.

Special lacquers are also available for more ‘aggressive’ products such as cheese.

Aluminium with a co-ex sealing layer is another option, which – because extrusion coated materials do not use solvents in the heat seal layer – can be considered more environmentally friendly than heat-seal lacquered material.

The thin plastic sealing layer also offers ‘easy’ low temperature sealing and increased protection for aggressive products.

Certain specifications are also suitable for hot fill and retort applications.

Surlyn (heat seal to glass co-ex) can also be used for sealing to both glass and tin, while recess diaphragms can be manufactured using laminates, lacquer and co-ex materials.

Other advantages include the elimination of container warping or panelling when packing hot-fill products.

Laminates are another adaptable material primarily used for ‘aggressive’, corrosive products or those that require additional processes such as cooking or hot fill.

Laminates can offer a weld (unpeelable) seal, which is ideal for chemical-type products, while certain laminates offer easy-peel functions and are used for food packaging where the consumer requires a good peel with a reduced risk of tearing the lid.

Available in gauges .040/.048/.070 and with HDPE, PET and modified PE as well as in combinations such as .012 and PET/.048 aluminium with heat-seal lacquer, these properties can provide increased tear resistance for high-value products such as ready-to-drink wine goblets.

Also offering total barrier protection from water vapour, oxygen transmission, aroma and light, laminates are an ideal choice for sensitive or extended shelf life products.

Another feature includes logo embossing, in addition to the standard patterns such as fine linen and random grub, or alternatively customers can opt for no embossing at all.

A non-aluminium laminate is also available using .065 polyester with an .040 cookable and peelable PP sealing layer for products such as pate and steamed puddings that have a post cooking process and require metal detection of the packed product.

This material also allows for consumer microwaving.

Chadwicks is part of the Flexible Packaging Division of the Clondalkin Group, which has more than 40 manufacturing sites located across Europe and North America.

As a manufacturer of pre-cut lids, Chadwicks offers its service to market sectors including food, dairy and beverage markets and exports 50 per cent of its output to areas such as Asia, Australia and New Zealand.

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