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Plastics/Sidel combi last bottle fault

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Question
Good Afternoon, we have a fault that has appeared on our combi, during production bottle quality is sound and stable, however the last preform in the oven before feeding stops is blown with a severe off centre gate. it is on random blowing cavs and injection cavs. This product has been running since the beginning of the week with no issues. preform quality is good and no there is no change in iv. blow charts are stable and there are no major air leaks- one compensation is leaking slightly on one station. I have tried to reduce and increase the pre-blow duration and pressure with no change, I have re-booted the system, tried switching off the air-recovery and haver adjusted the heat recovery, I have made the base hotter and colder however the fault stays. any advice on this would be greatly appreciated, kind regards Rachel

Answer
Hi Rachel,
First question have you contacted Sidel for help? they should be able to provide a technician to help over the phone or in person.
They are more likely to have come up against this fault.
From what you describe I would investigate how the last preform is delivered along the feeding station to see if you can spot any differences with how the last one is moved through the oven.
Off centre gate suggests preform wall thickness variation this can be caused by unequal heating of the preform.
Check out anything that may cause this to the preform.

regards,
Robert.  

Plastics

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Robert Tomlinson

Expertise

Tooling design,design for manufacture,tooling procurement,machine design,machine procurement,
Processes injection moulding,injection blow moulding,extrusion blow moulding, process control,productivity improvement,Quality,Decoration,Assembly,Automation.Thin wall moulding expert.

Experience

Recent and past projects. ?Designed various closures for a new type of composite tube and assisted company in bringing the product to market one design now in use by a major high street retail group a second design is currently moving into the production phase. ?Assisted a company in procuring sheet materials for a construction project. ?Identified source of a foreign plastic body for a major manufacturer of food products. ?Outsourced the manufacture of a building product reducing the cost of manufacture by 10%. ?Provided technical assistance to a manufacturer of blank car registration plates which improved production and reduced rejects. ?Provided interim management for a manufacturer of composite GRP tubes and structures. ?Carried out commercial due diligence and technical appraisal of a manufacturer of plastic products on behalf of the buyer a major investment group. ?Provided technical assistance to a major producer of closures with a hot runner and colour change problem. ?Provided technical assistance with a problem regarding a mould tool and hot runner system processing PET. ?Carried out research and development of a patented testing system for a major pharmaceutical manufacturer. ?Designed and implemented a manufacturing cell that produced annual savings of over 35k. ?Designed and project managed a transfer system of mouldings from the point of manufacture to the warehouse that reduced labour and eliminated bottle necks. ?Increased the production of aerosol caps by 16% at a leading European manufacturer which resulted in an increase of 600k components per day. ?Invented, designed and implemented an automatic part rejection system that reduced labour and customer complaints at a closure manufacturer. ?Set up joint venture between Indian and UK manufacturer. ?Designed auto engine support mounting bracket that reduced cost of manufacture. ?Designed planned preventative maintenance system for a manufacturer that reduce downtime by 10%. ?Reduced the cost of machine spares by 10% for an injection moulding company. ?Designed an automatic water cooling evacuation system as part of a single minute exchange of die project. ?Carried out procurement of replacement plastic pump parts for a Saudi Arabian company. ?Carried out appraisal and valuation of plant for a company prior to them purchasing a company. These are only a few of the successful projects that have been undertaken by Plastic Moulding Solutions since it?s formation if you require assistance then please do not hesitate to contact us to discuss your requirements.

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