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Preform post-mold cooling method and apparatus

A technology for molded products and cooling molds, which is applied in the field of cooling and devices after preform molding, and can solve the problems of preforms being too soft, unable to cool fluid/gas convergence, deformation, etc.

Inactive Publication Date: 2011-02-09
HUSKY INJECTION MOLDING SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this area of ​​a preform remains crystalline above a certain size and depth, then this will reduce the quality of a blown item
The second thing is that the preform will be too soft so it may deform during the later handling steps
This profile is very ineffective and does not allow the cooling fluid / gas to converge towards the nozzle section or dome section

Method used

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  • Preform post-mold cooling method and apparatus
  • Preform post-mold cooling method and apparatus
  • Preform post-mold cooling method and apparatus

Examples

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Embodiment Construction

[0053] See attached picture now, figure 1 Shown is a graph of the preform temperature versus time during injection and after injection is complete. figure 2 A preform in a model is schematically shown. As can be seen from this figure, cooling within the mold is generally accomplished by means of cooling tubes 12 and 14 located within the cavity 16 and core portion 18, respectively. In this way, cooling is performed from both sides of the preform 11 . In addition, if figure 2 As shown in , the cavity plate 16 generally has a nozzle region 20 formed at the bottom or dome portion 22 of the preform 11 . The preform has a neck root portion 13 which sometimes has thicker walls which are difficult to cool to such an extent that crystallization is prevented.

[0054] Figures 3(a) and 3(b) show the temperature gradient across a molded preform wall during cooling. Figure 3(a) shows the temperature gradient inside the model, while Figure 3(b) shows the temperature gradient outsid...

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PUM

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Abstract

The invention relates to an method and apparatus for injection molding and cooling molded articles such as preforms so as to avoid crystallinity. The apparatus and method make use of a take-off plate for removing articles (48) from a mold, which plate may include heat transfer devices for cooling exterior surfaces of the molded articles or preforms (48), and a system for cooling (74) in a controlled manner interior surfaces of the molded articles or preforms (48).

Description

[0001] Instructions for Divisional Application [0002] This patent application is a divisional application of a Chinese patent application with an application date of July 20, 1998, an application number of 98813946.4, and an invention title of "Cooling method and device after preform molding". technical field [0003] The present invention relates to a method and apparatus for the molding and cooling of plastic molded articles, such as preforms made of one or more materials, such as plastic resins. The present invention particularly relates to a rapid injection molding method in which the molded article, such as a PET preform, is ejected from the mold before the cooling step is completed. The present invention employs a new post-mold cooling method and apparatus for internally cooling the preform by means of convective heat transfer after it is removed from the mold and placed outside the mold. The invention also relates to external cooling by means of conductive or convec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29L22/00B29B11/08B29C49/06B29C45/72B29C49/64B29C35/16B29C45/73B29C33/04B29C71/00B29C45/42B29C39/38B29K67/00
CPCB29C45/7207B29B2911/1404B29B2911/1402B29B2911/14026B29B2911/14113B29B2911/14053B29B2911/14093B29C35/16B29C2035/1658B29C71/0063B29B2911/1408B29B2911/14133B29B2911/14066B29C2045/7257B29C49/06B29C49/6427B29B2911/1414B29B2911/14033B29C2045/7214B29K2105/253B29B2911/14106B29C2949/3016B29C2949/302B29C2949/3024B29C2949/24B29C2949/28B29C2949/26B29C2949/22B29C2949/3008B29C2949/3012B29C2949/3026B29C2949/3034B29C2949/3032B29C2949/0715B29C2049/023B29C49/643B29C49/6435B29C49/6465B29C49/6466B29C35/00
Inventor 维托尔德·内特尔费萨尔·韦斯拉蒂蒂默·布兰德戈登·埃利奥特理查德·翁特兰德格奥尔基·奥拉鲁
Owner HUSKY INJECTION MOLDING SYST LTD