Blow moulding machine with double cavity moulds
Blow moulding machine with double cavity moulds
A blow moulding machine for blowing thermoplastic containers starting with a previously injected preform, comprising several blowing stations each of which can bear a double cavity mould, wherein each station includes a blowing unit which is fixed on a mount frame element and provided with two blow nozzles. The machine can be transposed into a single cavity configuration wherein each station bears a single cavity mould, and the blowing unit includes a second position for being fixed on the mount frame element wherein one of the nozzels is arranged to correspond with the main axis of the single moulding cavity of the single cavity mound.
More particularly, it concerns blow moulding machines having at least one blow-molding station in which a mold carrier unit carries a two-impression mold having two mold cavities each of which is intended to receive one preform. In this case the blow-molding station comprises a blow-molding unit provided with two blow-molding nozzles that are movable between a retracted position and a blow molding machine position in which the nozzles can inject the fluid under pressure into the preforms in order to blow-mold the containers. To do this, the blow-molding unit is mounted on a frame element of the blow-molding station in such a way that the two nozzles are placed on either side of a central axis of the mold carrier unit, in correspondence with the principal axes of the two blow-molding cavities.
The invention will be more particularly intended to be implemented on rotary machines comprising several blow moulding machinery arranged on a rotor driven in continuous rotational movement. These rotary machines make it possible to achieve high rates of production.
However, the containers that can be manufactured with these two-cavity molds are small in volume. Indeed, the size of the two containers is limited by the size of the mold, which in turn is limited by the size of the mold carrier unit. But mold-carrier units that are too large in size can not be loaded on a rotary machine because this would result in excessively increasing the inertia of the machine's rotor. Thus, in the high-speed rotary machines that are currently known, the maximum volume of the containers that can be produced in a two-impression mold is less than one liter.
As it happens, however, in many cases the products that are sold in such containers, particularly drinks, are sold in containers of different sizes. Thus, a producer may wish to have containers of different formats, but in every case these containers must be produced under the most advantageous conditions.
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This article gives a brief idea about molding machine. It also tells the application which uses it. It also describe the types of moulding machine and its uses.
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