Oven for blow molding machine
Oven for blow molding machine
A method and apparatus is disclosed for establishing a preferred temperature profile useful in the oven portion of a blow molding machine by incrementally adjusting heating elements for the exterior of the oven while a stream of parisons are in motion through the oven. The disclosure also includes means and method for preserving and duplicating a preferred temperature profile.
The present blow moulding machine relates to plastic preforms or parisons and relates, in particular, to heat treatment of parisons to condition the parisons for further treatment or further forming such as blow molding.
Classically, a series of parisons are conveyed continuously while being rotated on a support mandrel through an oven containing a battery of heating elements. The heating elements impart heat to the body of the parison usually (but not necessarily) from top to bottom of a vertically disposed parison to condition plastic from which the parison is molded for subsequent treatment.
Invariably, the heating elements are fixed in position within the oven and are arranged relative to the path traversed by the parison and relative to the shape of the parison to create a desired temperature profile throughout the body of the parison.
In contrast, the present invention provides an apparatus and a process facilitating convenient, initial setting and subsequent adjustment of the position of individual heating elements in a battery of elements.
It is a principal feature of the present plastic injection molding machine to provide a novel process for developing a desired temperature profile to heat treat a plastic parison.
It is a further important feature of the present injection molding machine to provide an apparatus operable to set and adjust individual heating elements, to and fro, relative to a continuously advancing line or series of parisons in incremental fashion from a point external of the heating oven.
A further feature of the blow molding machine is the provision of a battery of heating elements, for the purpose indicated above, where each element is provided with individual support means including adjustment means for moving individual elements selectively and in step by step fashion to a variety of positions relative to a selected portion, region or point on the body of a parison.
A method and apparatus is disclosed for establishing a preferred temperature profile useful in the oven portion of a blow molding machine by incrementally adjusting heating elements for the exterior of the oven while a stream of parisons are in motion through the oven. The disclosure also includes means and method for preserving and duplicating a preferred temperature profile.
The present blow moulding machine relates to plastic preforms or parisons and relates, in particular, to heat treatment of parisons to condition the parisons for further treatment or further forming such as blow molding.
Classically, a series of parisons are conveyed continuously while being rotated on a support mandrel through an oven containing a battery of heating elements. The heating elements impart heat to the body of the parison usually (but not necessarily) from top to bottom of a vertically disposed parison to condition plastic from which the parison is molded for subsequent treatment.
Invariably, the heating elements are fixed in position within the oven and are arranged relative to the path traversed by the parison and relative to the shape of the parison to create a desired temperature profile throughout the body of the parison.
In contrast, the present invention provides an apparatus and a process facilitating convenient, initial setting and subsequent adjustment of the position of individual heating elements in a battery of elements.
It is a principal feature of the present plastic injection molding machine to provide a novel process for developing a desired temperature profile to heat treat a plastic parison.
It is a further important feature of the present injection molding machine to provide an apparatus operable to set and adjust individual heating elements, to and fro, relative to a continuously advancing line or series of parisons in incremental fashion from a point external of the heating oven.
A further feature of the blow molding machine is the provision of a battery of heating elements, for the purpose indicated above, where each element is provided with individual support means including adjustment means for moving individual elements selectively and in step by step fashion to a variety of positions relative to a selected portion, region or point on the body of a parison.