Neck ring process

Dining the process, the neck-finish area of the parison must be cooled to retain its shape the remainder of the parison is kept hot for later expansion in the bottle cavity. Depending on the plastic molding material, the temperature of the parison is between 65 and 135°C. The neck-ring insert is at times cooled as low as 5°C. The water lines for both the cavity and the neck-ring are usually drilled as closely together as possible, perpendicular to the cavity axis. The water flows from one cavity to the next. 

With dip biow moiding, the biow pin dips into the dip chamber [9j. After the neck ring is fiiied, the biow pin is puiied back. Axial variations in parison wall thickness can be achieved by programming the motion of the dip chamber piston. Figure 1.161 shows the production of the parison. The parison is then taken over by the blow mold, and the product is biown. After that, the blow pin is withdrawn, and the blow process is continued with an auxiliary blow pin. 

Preform reheat-stage option is available for BlowView as a two stage SBM process. Reheat process parameters such as reheat time, number of preform rotations, neck ring length, preform distance form reflector, lamp dimensions and number of lamps are entered as input. In this way, simulation process conditions will be closer to reality. However in this study, we did not use this option in order to make similar conditions with B-SlM. 

In the blow and blow process the gob is dropped into an open blank or parison mould. The neck is formed by top blow and then the parison or blank is blown from the base (Figure 6.2). The blank shape supported by the transfer ring is then transferred to the finishing mould where it is blown into the final shape. This blow and blow process is the major process employed—usually with IS (i.e. independent or individual section) machinery Other machines include Roirant R7, S10 and Lynch 44. IS machines may have 4, 5, 6, 8, 10 or 12 stations. For small containers double, triple or quadruple gobbing may be employed. The last can give speeds of over 400 containers per minute. 

Ampoules with a ceramic break band the break ring in the neck of the ampoules are made with a ceramic paint, which shrinks faster than glass during the cooling process. The tension that arises thus eases breaking. 

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