High Quality Molds for PET Packaging

Polyester-based PET (polyethylene terephthalate) was originally synthesised by chemists during a search for polymers to make new textile fibres in late 20s and early 30s of last century. Thanks to the endeavours of the scientists of the British company, Imperial Chemical Industries (ICI) in 1941, PET was developed as a film by stretching a thin extruded sheet in two directions and thereby found extensive use as video, photographic and X-ray film in addition to uses in packaging.

In the early 1970s, successful experiments were conducted to stretch this material in three dimensions by blow moulding. It was similar to inflating a balloon in a shaped mould. And the result was the first bottle type containers initiating the exploitation of PET as a lightweight, tough, unbreakable substitute for the glass bottle.

This technique of Pet Preform Moulds Inserts became popular for mass production of hollow objects like bottles, jars and assorted containers.

The credit for this has been attributed to the injection blow moulding process that produces bottles of superior visual and dimensional quality vis-à-vis extrusion blow moulding.

Since then this process has been accepted worldwide as ideal for both narrow and wide-mouthed containers.

By and large, the credit for this success rests solely on the PET Preform Bottle Industries, since it is this product that ensures the intended mode of packaging is perfect.

The process of making PET bottles is divided in to three areas – injection, blowing and ejection.

The injection blow moulding machine is based on an extruder barrel and screw assembly which melts the polymer. The molten polymer is fed into a manifold where it is injected through nozzles into a hollow, heated preform mould.

This preform mould forms the external shape and is clamped around a mandrel (the core rod) which forms the internal shape of the preform.

The preform consists of a fully formed bottle/jar neck with a thick tube of polymer attached, which will form the body.

Later, the preform mould opens and the core rod is rotated and clamped into the hollow, y a process named chilled blow mould. The core rod opens and allows compressed air into the preform, which inflates it to the finished article shape.

On completion of the cooling period, the blow mould opens and the core rod is rotated to the ejection position.

The finished article is stripped off the core rod prior to sending it as a packing material. It is is tested for leaks, known as barrier proofs.

The preform and blow mould can have many cavities, typically three to sixteen depending on the size of the article and the required output. However, as per the end-user’s needs, these can be designed and developed including refurbishments.

Incidentally, a New Delhi based company engaged in designing, tooling and manufacturing these mold has accomplished in assembling molds of 72 cavities.

There are three sets of core rods, which allow concurrent preform injection, blow moulding and ejection.

To accurately check every single mold on certain parameters, reputed companies like the one in New Delhi mentioned above have modernised testing lab that is well equipped with ultra modern testing machines, latest tools, and advanced instruments to hasten process.

Acme Disys Established in 2002, Acme Disys is a leader and an innovator in the Pet Preform Mold industry. Bottle Moulds Industries.