The main unit is a tubular reactor that leads to a significant reduction of energy, raw materials consumptions, operation costs and capital costs. New technologies are currently replacing this design with a tendency to reduce the number of units involvedĪ radical approach that is rapidly becoming more and more employed is Eastman IntegRex technology (illustrated in figure 2). PET preform manufacturing is a process line that molds polymer bottles to make oil, beverage, and detergent containers. The traditional Buhler process integrates four typical stages for producing bottle grade PET : crystallization, annealing, solid state polymerization (SSP) and cooling. But when very high molecular weights are desired, as is the case for bottle grade PET resins, the polymerization may be carried out in stages. The first part consists of melt phase reaction used to produce copolymers with an intrinsic viscosity (IV) suitable for textile applications.

The conventional PET process consists of two discrete plant sections. All PET resin manufacture processes are using the same reaction path as shown in the figure bellow : PET is produced from high purity ethylene glycol (EG) and Terephthalic acid (TPA). The main downstream industries based on PET are production of polyester fibers, accounting for around 65% of global consumption, and PET bottle resins consuming around 30%. Particular characteristics of a product, projected demand and acceptable level of tooling investments command the choice and we are here to help the right decision-making.Polyethylene Terephthalate (PET) is one of the major polymers produced worldwide representing about 18 % of world polymer production and comes in third after Polyethylene and Polypropylene. Some of those materials are PEN, PE or Tritan, which are used for products like baby bottles because PET cannot withstand the boiling sterilization temperatures that these bottles require.īoth technologies have their advantages and shortcomings. The single-stage process enables reliable temperature control of plastics with many different characteristics. which is widely used for cosmetics in particular.īecause preforms are moulded from the plastic pelletized material and then stretch-blow molded straight away, not just PET, but a whole range of other plastic materials can be moulded. The process core characteristics make it especially suitable for moulding non-standard shapes like off-center containers, oval shapes etc. investment cost, high production speed, easy to add a handle, the bottle could. The greatest merit of the technology is the reduction in space and product handling, and higher visual quality than can be achieved by the 2-step system. process could stretch the PET film in two directions in the stretch blow. (2) preform is transferred in hot pot station. Blow moulding process is generally the same with re-heat stretch blowmoulding process as described above. PET preforms are not produced as intermediate semi-product for later re-heat and blow-molding, but the still-hot injection moulded preform is moved directly into blow-molding section. In single-stage production, the entire process from raw material to finished container is conducted within one machine. RSBM is very common for mass production, such as bottles for drinks, but it also suits quite well for customized articles and low-scale production thanks to the greater flexibility. Injection and blow moulding are completely independent of each other and can therefore be optimized separately. (6)-(7) blow mould opens and ready container extracted.ĭuring RSBM transformation, the material undergoes significant changes in molecular orientation enhancing various barrier properties, making PET containers, which are virtually unbreakable, lightweight, and with the perfect clarity that is present in preform. (4)-(5) compressed air inflates in two steps to provide better quality of a container’s walls (3) stretch rod goes into and lengthen the softened preform (2) preform is clamped into the blow mould In the second stage of the process, preforms get heated and blown into finished containers. At this stage, the neck of the preform is fully finished but the diameter and length is much smaller than the bottle or jar into which it will be transformed. During the first stage, injection machines produce semi-finished products called preforms.

RSBM is the process of making containers from PET or other resins in two steps.

In addition, standard injection moulding used to produce plastic closures and other accessories. There are two major different ways of making a PET bottle or jar: single-stage, or injection stretch blow moulding (ISBM) and two-stage, or re-heat stretch blow moulding (RSBM). We employ both technologies in our company. The book Technology of PET Bottles, Preform and PET Recycling covers PET Plastic packaging, Properties of PET, Recycling of PET, Aseptic Filling of PET Bottles, Flexo Inks for the printing of Non treated Polyester films (PET) on central impression Flexo Presses, Production and filling process of a Pet Bottle, PET Bottle Recycling, PET Preform.

Pet preform manufacturing process