Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – With heating or cooling means
Patent
1995-12-20
1997-11-04
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
With heating or cooling means
264535, 264538, 425534, B29C 4964, B29C 4948
Patent
active
056837291
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a plant for manufacture of containers such as bottles, pots, or any other type of hollow body, by thermal conditioning followed by blow moulding of plastic preforms.
It applies in particular to the manufacture of containers in polyethylene terephthalate (PET), obtained by draw-moulding of preforms after they are subjected to appropriate thermal conditioning.
Known manufacturing plants for blow moulding of preforms comprise a station for thermal conditioning of preforms, where the preforms are brought to a temperature at which they can then be deformed by blow moulding, a station supplying preforms to this conditioning station, a blow moulding station having moulds whose recess exhibits the finished external form of the container to be produced, and a transfer station for preforms between the thermal conditioning station and the blow moulding station.
For the majority of materials, and particularly PET, it is preferred to draw the preform in a controlled manner and concomitant with blow moulding. In this case, the blow moulding station is replaced by a drawing blow moulding station, simultaneously comprising drawing means such as an extension rod which embosses the floor of the preform in a controlled manner during blow moulding.
In the following description, the term blow moulding applies equally to pure blow moulding or to drawing blow moulding.
Various types of manufacturing plants already exist. In a known type of plant the blow moulding station is constituted by a device mounted to rotate around a vertical axis. By virtue of its circular movement, this device, known as blow moulding wheel or carousel, comprises at least two identical moulds, each having a moulding cavity, distributed symmetrically and regularly relative to the axis of rotation and each borne by a die support device.
Consequently, if there are two moulds, they are diametrically opposed; more generally, they are offset at an angle A determined by the following equation: A=360.degree.
, in which n is the number of moulds.
Each mould is formed from two half moulds articulated around another vertical axis supported by the carousel and mounted such that the moulds open like a wallet, along a radial symmetry plane, passing through the axis of revolution of the carousel and through the axis of articulation of the half moulds; they open in the direction of the periphery of the blow moulding mould.
It is known for these plants to produce high cycle rates; therefore, with materials such as PET and the current thermal conditioning processes, as many as 1100 containers can be manufactured per hour utilising drawing blow moulding and moulds, with the overall capacity of the plant depending on the number of moulds supported by the carousel. By way of example, the largest plants currently being operated by the applicant carry 40 moulds.
In plants of this type the thermal conditioning station comprises supports, each of which is adapted to receive and grip a preform, firmly though removably, and which are fitted between them to constitute an endless device. The endless device may be constituted by a carousel, or then again in the manner of a chain supported by at least two driving pinions. The preforms are held in these devices by means such as a mandrel with an elastic ring and introduced into their openings. Furthermore, the supports are fitted into the thermal conditioning station such that the preforms can be heated there with the opening--the neck--facing downwards to avoid any deformation, by convection, of this opening during thermal conditioning. In effect, the opening of the preform corresponds already to that of the finished container.
Moreover, known plants are preferably equipped in such a way that after thermal conditioning the preforms are turned over so that their opening is uppermost, so that they are not deformed under their own weight and because of their softness prior to blow moulding of the containers. In this case, they can be turned upright in the thermal conditioning
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Davis Robert
Sidel S.A.
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