Thermal conditioning method and apparatus including gradual ignition and extinction of emitters
A thermal conditioning, emitter technology for the manufacture of containers from preforms made of plastics such as PET, capable of solving the problems of poor quality, unsatisfactory heating profiles, quality defects, etc.
Active Publication Date: 2022-04-29
SIDEL PARTICIPATIONS SAS
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Problems solved by technology
[0013] However, some quality flaws were found in the short stages at the beginning and end of production
[0014] In fact, it was found that the heating profile of at least the first preform entering the furnace (called the header) at the start of production was not satisfactory
More precisely, the head preform is overheated, i.e. its average temperature is too high, so that its molding results in a poor quality container that should be discarded
Method used
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Embodiment Construction
[0042] The figure shows a heat regulating device 1 for a preform 2 of a container made of plastic, for example polyethylene terephthalate (PET).
[0043] Each preform 2 has a substantially cylindrical body 3 closed at one end by a hemispherical base 4 and extended at the opposite end by an open neck 5 whose shape is the final shape and intended to form the bottle of the container mouth.
[0044] The necks 5 of the preform 2 are directed upwards, but they could also be necks directed downwards.
[0045] The thermal conditioning device 1 , referred to below more simply as "furnace", is configured to heat the preforms 2 above the glass transition temperature of their material. In the case of PET, which has a glass transition temperature of about 80°C, for example the preform 2 is heated to a temperature greater than or equal to 100°C.
[0046] After being softened by heating in the furnace 1, each preform 2 is intended to undergo a forming operation in a mold, for example by bl...
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Abstract
Method of thermal regulation in a thermal regulation device (1) equipped with a row of adjacent emitters (E 1 …E N ), each emitter includes a plurality of sources of monochromatic electromagnetic radiation, and the thermal conditioning device is also equipped with a sequence of preforms (2) having a head preform (2T) or a tail preform (2Q), the thermal The regulation method consists of the following operations: - regular determination of the position of the head preform (2T) or tail preform (2Q); - gradually igniting the position of the head preform ( 2T) downstream and near emitters, or gradually extinguish emitters located upstream or near the tail preform (2Q).
Description
technical field [0001] The present invention relates to the manufacture of containers from preforms made of plastic, such as PET. Background technique [0002] This preform typically includes: [0003] - the first stage of the thermal conditioning (also called heating) of the preform, which takes place in the thermal conditioning device (also called furnace) delimiting the heating chamber, which consists in advancing the preform inside the heating chamber so that bring their temperature above the glass transition temperature of the material (for PET this is about 80°C); [0004] - the second stage of forming the container from the preform, carried out in a forming device equipped with a mold of the cavity of the container to be formed, this second stage consists in bringing each hot preform into the mold and feeding it to the mold The preform is injected with a fluid under pressure (in particular a gas, generally air) in order to press the preform against the mold and thus...
Claims
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IPC IPC(8): B29C49/64B29C49/68
CPCB29C49/6409B29C49/68B29C49/06B29C49/36B29C49/6418B29L2031/7158B29K2067/003B29K2105/258B29C2949/0715B29C35/0805B29C2035/0838B29B13/024
Inventor H·帕基耶Y·拉奥盖D·苏费斯G·弗约莱
Owner SIDEL PARTICIPATIONS SAS