Cooling tube with porous insert
a technology of cooling tubes and inserts, applied in the field of cooling tubes, can solve the problems of uneven cooling, lessen cooling efficiency, visible haze, etc., and achieve the effects of reducing the risk of unacceptably high levels of acid aldehyde, enhancing cycle time, and improving robustness of preform
Inactive Publication Date: 2005-08-25
HUSKY INJECTION MOLDING SYST LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
More specifically, while one injection cycle is taking place, the post mold cooling system, typically acting in a complementary fashion with a robotic part removal device, is operative on an earlier formed set of molded articles that have been removed from the mold at a point where they are still relatively hot, but sufficiently solid to allow limited handling.
In many other cooling tube arrangements, the preform (at some point, if not from the point of introduction) looses contact with the internal side walls of the cooling tube, which loss of thermal contact lessens cooling efficiency and causes uneven cooling.
As will be understood, uneven cooling can induce part defects, including deformation of overall shape and crystallization of the plastic (resulting in areas that are visibly hazed).
Furthermore, lack of contact can cause ovality across the circumference of the preform, while the loss of the cooling effect can mean that a preform is removed from the cooling tube at an excessively high temperature.
In addition to causing surface scratching and overall dimensional deformation, premature removal of a preform at an overly high temperature can also result in the semi-molten exterior of preform sticking either to the tube or another preform; all these effects are clearly undesirable and result in part rejection and increased costs to the manufacturer.
However, as the preform cools it will shrink and therefore may loose contact across its entire circumference with the cooling tube yielding an uneven cooling effect.
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[0036] The present invention will now be described with respect to embodiments in which a porous cooling tube is used in a plastic injection molding machine, although the present invention is equally applicable to any technology in which, following part formation, cooling of that part is undertaken by a cooling tube or the like. For example, the present invention can find application in a part transfer mechanism from an injection molding machine and a blow-molding machine.
[0037]FIG. 1 shows a typical injection molding machine 10 capable of co-operating with a device supporting the cooling tube of the present invention. During each injection cycle, the molding machine 10 produces a number of plastic preforms (or parisons) corresponding to the number of mold cavities defined by complementary mold halves 12, 14 located within the machine 10.
[0038] The injection-molding machine 10 includes, without specific limitation, molding structure such as a fixed platen 16 and a movable platen 1...
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Abstract
An injection-molding machine cooling tube, which cools molded plastic parts, includes a porous cooling tube having an outer surface and an inner surface. Preferably, the porous cooling tube has a porosity in the range of 3-20 microns. A cooling fluid passageway is preferably disposed adjacent the porous cooling tube outer surface and is configured to carry a cooling fluid to extract heat from the porous cooling tube. Fluid flow structure, preferably a vacuum, is configured to cause a molded plastic part inside the porous cooling tube to expand into contact with at least a portion of the inner surface of the porous cooling tube.
Description
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates, in general, to cooling tubes and is particularly, but not exclusively, applicable to cooling tubes used in a plastic injection-molding machine to cool plastic parts, such as plastic parisons or preforms. More particularly the present invention relates to a structural configuration of these cooling tubes, and also to method of manufacturing and using such tubes, for example in the context of a manufacturing process for preforms made from polyethylenetetraphthlate (PET) or the like. [0003] 2. Related Art [0004] In order to accelerate cycle time, molding machines have evolved to include post mold cooling systems that operate simultaneously with the injection molding cycle. More specifically, while one injection cycle is taking place, the post mold cooling system, typically acting in a complementary fashion with a robotic part removal device, is operative on an earlier formed set of molded...
Claims
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IPC IPC(8): B29C35/16B29C45/00B29C45/72B29C48/09B29C48/32B29C49/06B29C49/42B29C49/64
CPCB29C45/0053B29C45/7207B29C47/0028B29C47/0054B29C47/12Y10T428/1352B29C49/4205B29C49/6427B29C2035/1616B29C2045/7214B29L2031/60B29C49/06B29C48/11B29C48/0017B29C48/09B29C2949/0715B29C2049/023
InventorNETER, WITOLDNIEWELS, JOACHIM JOHANNESUNTERLANDER, RICHARD MATTHIASURACZ, TOMASZROMANSKI, ZBIGNIEW
OwnerHUSKY INJECTION MOLDING SYST LTD