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Flat Plastic Closures

1881 – Are you ready to move across?

The PET soft drinks and PET water market are looking to its suppliers to offer cost saving opportunities. Moving from 1810 to 1881 Preforms and Closures is one way to make those savings possible by exploiting the weight reductions and material savings along with a small height reduction in the PET Bottle and HDPE closure. Using less raw material and transporting less weight across the end to end supply chain, results in a more competitive platform to launch new or re-brand existing products and reach new customers from.

The short-height neck-finish standard 28mm PCO 1881 is replacing the standard 28 mm PCO 1810 serve soft drink bottles, with bottlers benefiting from the material savings. The difference in weight between a 1810 neck finish and a 1881 neck finish is approx.. 1.3g per bottle. The same weight reduction applies for a 500ml and a 2L regardless of bottle weight.

The cost saving of the PET preform material alone, without looking at the conversion costs involved would result in a 10% saving based on a 13.5g pre-form. The heavier the pre-form the smaller the % saving.

The new standard 28mm PCO 1881 reduces the resin costs associated with making polyethylene terephthalate (PET) pre-forms and HDPE closures. The decrease in the amount of material used in pre-forms is 1.3 grams and in standard 28-mm closures 0.5 grams. The combined savings of 1.8 grams per bottle, multiplied by millions of bottles each year can reduce costs considerably.

Bottling lines will require some investment to transition to the PCO 1881. Talk to us to find out how our technical team can support you. We have the experience to support your move across.

In light of the increased focus on Single Use Plastics, the environmental benefits of the reduced material consumption through light weighting of the 28mm PCO 1881 means a reduced waste stream, lesser PET and HDPE entering the recycling system resulting in lesser collection, storage and reprocessing costs. Great news for the environment.

Plastic Closures – HDPE vs PET

Customer sometimes ask us why closures are made from PET and if they were, they could be recycled with the PET bottle.

Let us explain more…

PET and HDPE are very commonly used as packaging raw materials.

PET is also known as PETE or Polyester. PET stands for Polyethylene Terephthalate and is mostly used for the manufacturing of plastic beverage bottles. PET is a very clear plastic and can look like glass once set to its desired shape. PET can also be coloured matched to any colour. PET is, lightweight and tough against gases and liquids. PET is also highly resistant to diluted acids, oils and alcohols. PET has a lower temperature resistance than HDPE. PET containers can handle cold temperatures of about -40°F.

High-density polyethylene (HDPE) or polyethylene high-density (PEHD) plastic is known for its durability and strength. While not as clear as PET plastic, HDPE caps, bottles, containers can be translucent so you can to see your product inside the bottle. This type of plastic can also be colour matched. HDPE bottles are able to withstand low temperatures very well (-110° F) and higher temperatures moderately well near 167°F. HDPE is very stiff, has a good temperature resistance and a very good water vapour barrier.

The most important reason why PET is not used as a closure material is that using PET on PET will not provide an adequate seal for threaded closures. In the past, two piece closures were used for Carbonated Soft Drinks (some two piece closures are still manufactured today). In the two-piece closure system, the liner ensures the cap makes a tight fit to the PET bottle neck, providing a tight seal. Today, this can be achieved with a single piece HDPE organoleptic closure with a bore seal structure.

PET gains strength when it is stretched during the blowing operation. This second operation cannot be achieved in the process of closure moulding which is performed as a single operation.

Viscose supplies flat plastic closures,  in standard stocked colours, bespoke colours subject to MOQ’s. Please contact 

Download the 1810 Flat Plastic HDPE Closures Data Sheet Here

Download the 1881 Flat Plastic HDPE Closures Data Sheet Here

Find out how Viscose have supported customers moving from 1810 to 1881’ closures.

Download the Custom Digital Print Closures Data Sheet Here

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