At Polywrap, “we know film”

Our products range from specialist manufactured film or bags individually designed to suit your needs or the more regular ‘Stock Line’ products such as bin liners, carton liners, drum liners, bottom seal bags

Our specialist technical sales team can help you design your own custom made manufactured product such as:
We specialise in the manufacturing of the following types of polyethylene film and non plastic film and bags:

Film packaging functions

Separate to the basic functions of containing and dispensing of contents, film packaging suitability is usually assessed by the protective and preservation qualities provided by its use.  Customers will have a range of packaging needs that can vary from protection against physical damage, light and temperature and substances such as dirt, water, dust, gases and odours.  Alternatively, preservation of contents may be an essential need, such as the extension of the shelf life of food products whereby the film packaging material should be able to provide low permeability to oxygen, which is a key performance characteristic of Modified Atmosphere Packaging (MAP) film.

Why film properties matter

The properties of film will vary depending on the grade of resin and additives included in the film’s composition. By way of example, Linear Low Density (LLD) grades will typically have higher tear strength, elongation, puncture resistance and heat sealing properties than Low Density (LD) and High Density (HD) grades. LD grades have lower haze. HD grades will usually have higher stiffness, greater chemical resistance, higher resistance to blocking, lower resistance to creep and higher softening temperatures. Additives improve and vary film properties such as metallocenes which improve impact strength and heat sealing.

Understanding the use and application of the film will determine the selection of film grade and additives used. Certain products can only be packaged using specific film grades, such as virgin grade resin applications in film packaging for food items.

Basic features of bag sealing

Side seal bags are formed by folding the film to create a bottom and then by sealing each side. The top is left open for filling. Bottom seal bags are made by tubular film with a heat seal used to create a bottom. Gusseting is typically used to widen the bag or at the bottom of the bag to allow contents to be stood in the bag as required. Lip seal bags have an extension on one side of the bag often accompanied by a strip of adhesive. We can work with you to design the best fit bag seal suitable for your product and where relevant, own production requirements.

Our production capacity

Our production capacity includes a number of blown film extruders, print and converting machines, each overseen by specialist teams that are highly skilled in the production of material from their deployment. Our single site integrated operation allows us to fulfil both large repeat or once-off custom orders at short notice.