Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1985-09-30
1987-07-07
Spitzer, Robert
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
425552, 425DIG227, 425DIG245, B29C 4520, B29C 3302
Patent
active
046784268
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a transfer nozzle or die in a hot runner tool according to the preamble of the independent patent claim 1 or hot channel injector of a hot channel plastic injection molding machine, in which the nozzle mouth opens directly into the mold cavity and is provided with a heatable nozzle body having a conical tip situated in the nozzle mouth, which nozzle body is disposed in a nozzle cavity or transfer chamber of the hot channel injector located between the supporting body or basket forming a connection to the machine supply nozzle and that tool part or main tool body containing the injection nozzle which opens directly into the mold cavity of the machine. In hot runner tools or hot channel injectors for plastic injection molding machines the nozzle mouth opens directly into the mold cavity. Thereby sprue parts are avoided, which would have to be removed after the injection molding plastic material has solidified. A disadvantage is that in a cooled tool part or main tool body a runner or channel must be maintained at the melting temperature of the plastic. Several design forms for transfer nozzles, which are arranged between the machine nozzle and the mold cavity, have become known from the practice.
According to a known older design form described in Swiss Patent CH-A No. 578,417, the nozzle mouth of the injection nozzle is formed by a cap. The nozzle body is located in a central bore and comprises a positively controlled nozzle needle which closes the nozzle mouth in closing position. The nozzle body comprises an axial through-bore for passage of the material being molded.
By the Plastic Service GmbH in Mannheim, hot runner nozzles in various design forms have been illustrated in a data sheet collection for a product group 4.3 Hot Runner System "Thermojet". In it a nozzle insert is provided with an axial eccentric runner for liquid molding material. In the central zone of the nozzle head is a so-called torpedo tip in the form of a cone free on all sides, whose tip is arranged in the nozzle mouth. In the center of the torpedo, an axially disposed cylindrical heating cartridge is provided. The nozzle body is further provided with an external accessory heater band. To keep the heat removal as low as possible, air pockets are formed in the holding region of the tool part, in that the nozzle body is mounted exactly centered by means of ribs. The feed lines must be brought out laterally through the axial centered arrangement of the heating cartridge, and this requires the eccentric arrangement of the runner and a relatively large nozzle cavity in the region of the torpedo tip, to utilize the heat given off on all sides. At these points, however, a high temperature may result, and molding material present there may "boil away". Besides, after work interruptions relatively much unusable molding material must be liquefied in this nozzle cavity, which constitutes a loss of energy.
It is, therefore, an object of the invention to avoid these disadvantages in a hot runner injection nozzle. According to the invention, this objective is achieved by the features of providing a nozzle body consisting of a cylindrical heatable center part and a nozzle tip axially contiguous thereto and a sprue cone, with a tip and cone being provided with sleeve-like collars which embrace or surround the nozzle tip and the sprue cone at least when a part of their length, and which is supported on the one hand at the supporting basket or body and on the other hand at the tool part or main tool body; and of providing within the sleevelike collars a number of axial passages for the plastic which passages are distributed in annular arrangement; and in particular of providing in the center part of the nozzle body a radial passage bore for the uptake or accommodation of a heating element therein. Especially advantageous design forms contemplate forming a heat insulating interspace between walls of the nozzle cavity and the outer edge portions of the nozzle body in addition to the sleevelike collars which support the n
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patent: 4230934 (1980-10-01), ter Beek et al.
patent: 4373132 (1983-02-01), Vartanian
patent: 4517453 (1985-05-01), Tsutsumi
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