Apparatus and method for heating plastic preforms
A technology for plastic blanks and equipment, which can be used in ohmic resistance heating devices, applications, household appliances, etc., and can solve problems such as poor irradiation effects
Active Publication Date: 2018-11-30
KRONES AG
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Problems solved by technology
This unnecessarily supplied excess radiant energy or heat must also be cooled in a complex manner, which is detrimental to the energy term, for example also occurs by cooling the mouth
[0005] The known elliptical reflectors cannot completely avoid this negative effect, because even if the focal point (i.e. the second focal point of the ellipse) is set on the first preform wall to precisely illuminate the beam, the beam will be lost in the second preform. Fanned out again, thus heating the mouth again
The simple parabolic reflector also has disadvantages, it must be designed very wide and the illumination effect is worse than the elliptical reflector
Method used
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Embodiment Construction
[0087] figure 1 A schematic diagram of the structure of the apparatus 1 of the present invention is shown. In this example, the plastic preforms 10 are initially transported by the transport device 32 to the separation device 34 (such as a special but not exclusive sawtooth star) for separation. The plastic preforms 10 separated in the manner described above are then transferred to the actual heating device, ie the plant 1 , and in this example are conveyed to a plurality of support devices 14 . As before, these support means 14 may be or have mandrels engaged to the mouth of the plastic preform 10 .
[0088] In each case, the reference numeral 4 relates to a heating device which is arranged laterally along the transport path T or part thereof with respect to the plastic preforms thus transported. Reference numeral 22 designates generally schematically a rotating device for rotating the plastic preform 10 about its own longitudinal axis.
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The invention relates to a device (1) for heating a plastic preform (10), comprising a transport device (2) for transporting a plastic preform (10) along a preset transport path (T) and relative to said plastic preform ( 10) At least one heating device (4) is fixedly arranged on the transmission path. The heating device (4) has at least one first radiation source (42) emitting heat radiation and directs at least a part of the heat radiation emitted by the first radiation source (42) on the surface of the plastic preform (10). At least one reflective device (50) reflecting in the direction. The reflecting device (50) of the present invention includes a first segment (52) having a generally parabolic curved configuration and a second segment (54, 56) having a curved configuration. The curvature progression of the second segment is different from the curvature progression of the first segment (52).
Description
technical field [0001] The invention relates to an apparatus and a method for heating plastic preforms. Background technique [0002] In the prior art, known so-called plastic preforms, especially those made of PET, are first heated in a furnace and then shaped or expanded in the case of a blow molding process, in particular a stretch blow molding process Form into plastic containers. During the actual heating of plastic preforms in heating modules, infrared radiators behind which reflectors, especially in the form of rib tiles, are generally used for heating. Directional intensive heating of specific areas, especially the neck region of the plastic preform, is usually achieved by placing a quartz glass disk between the radiator and the plastic preform. In this case, attempts are also made to separate the infrared radiation irradiating the body of the plastic preform from the infrared radiation of the oral region. During the subsequent deformation process, usually only th...
Claims
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IPC IPC(8): B29C49/64
CPCB29L2031/7158B29C49/06B29C49/6445B29C49/08B29K2105/258B29K2067/003B29C2949/0715B29C49/6835H05B3/0057B29L2031/712
Inventor 沃尔夫冈·舍恩伯格
Owner KRONES AG