Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Radiated energy
Patent
1998-04-14
1999-11-09
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Radiated energy
264454, 264535, 425526, 425534, B29C 3108, B29C 4968
Patent
active
059802294
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a heating device for a machine for the transformation of plastic material, comprising, arranged along a guide track, a heating device adapted to coact with at least one row of preforms carried by supports moved through the heating device, this latter having a heating body arranged facing the preforms.
There is known from Swiss patent 683.757, a machine for the transformation of plastic materials, in the form of a machine for the production of receptacles from PET, comprising a heating device. In this device, the preforms aligned in a single row are displaced in the heating device which comprises infrared lamps disposed on two sides along the row of preforms.
To heat a single row of preforms, the heating device therefore has two heating bodies with infrared lamps. A large portion of the energy of these latter is not specifically directed toward the preforms to be heated, but dispersed laterally and upwardly and downwardly into the general area of the heating device and of the machine. The known heating device is thus less economical and produces a rise in the environmental temperature which is undesirable, or even harmful.
The present invention has for its object to overcome these drawbacks and it is characterized to this end by the fact that the heating body comprises at least two heating tubes each containing a bidirectional heating blade adapted to emit heating radiation to two opposite sides, the two tubes being adapted to be arranged between the two parallel rows of preforms to form a heating body of which each of the heating blades is inclined at a predetermined angle relative to a vertical plane such that a first of its surfaces emits heating radiation in the direction of the adjacent row of preforms and such that the second surface emits heating radiation toward the farther row of preforms substantially in the direction of the space which is not covered by the opposite heating tube or tubes.
There is thus obtained a heating device with a very high energy efficiency. The radiation emitted by the heating tubes is directed precisely toward the preforms to be heated and a single heating body suffices to heat simultaneously two rows of preforms. Regions shaded from the heating radiation of the preforms are avoided. The heating power can thus be greatly decreased, from which result substantial savings of energy. The general environment of the machine may thus remain at a lower temperature.
Preferably, the device comprises at least four heating tubes to comprise a heating body of polygonal cross section, each of the heating blades being inclined at a predetermined angle .alpha. relative to a vertical plane such that said second surface emits heating radiation in the direction of the free space between the opposed heating tubes toward the farther preforms.
The geometric arrangement of the heating radiation in thus particularly well distributed and balanced without giving rise to shaded zones and by avoiding in an optimal manner energy losses.
According to a preferred embodiment, the heating body has a substantially rectangular cross section and a horizontal and vertical position of the heating tubes relative to the frame of the heating body and said predetermined angle are adjustable as a function of the size of the preforms.
These characteristics ensure very effective heating at a high output. It is also possible to heat differentially certain regions as a function of the ultimate transformation desired.
Very favorably, the heating device comprises reflectors arranged in an external position relative to the heating tubes and to the preforms and shaped so as to reflect the heating radiation emitted by the heating tubes disposed nearest the reflectors in the direction of the preforms of the farthest row of preforms through the free space between two successive preforms of the nearest row.
There is thus obtained also an optimum horizontal thermal distribution concentrating all of the radiation toward the preforms to be heated. The efficiency is thus again significantly improve
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Davis Robert
Tetra Laval Holdings & Finance SA
LandOfFree
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