Plastic article or earthenware shaping or treating: apparatus – Means applying electrical or wave energy directly to work – Radiated energy
Patent
1997-12-31
1999-03-02
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
Means applying electrical or wave energy directly to work
Radiated energy
264454, 264535, 425526, 425529, 425534, B29C 4968, B29C 3108
Patent
active
058767681
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
This application is the 35 USC 371 National stage of International application PCT/IB96/00702 which was filed on Jul. 16, 1996 and designated the United States of America.
FIELD OF THE INVENTION
The present invention relates to a machine for the production of receptacles of plastic material comprising a frame and, arranged along a guide path, at least one heating device and a blow molding device, the receptacles being formed from preforms disposed on carriers displaced along the guide path.
BACKGROUND OF THE INVENTION
A machine of this type is described in Swiss patent 683.757 and comprises a guide path on which carriers bearing a preform are moved through the various production steps and devices. The carriers and the preforms comprise a single row moving at a single speed. Given that the heating of the preforms is a relatively long operation, the length of the guide path must be fairly great to obtain suitable heating, which greatly increases the overall size of the machine, or else the speed of the preforms along the entire circuit must be lowered as a result, which considerably reduces the output of the machine.
SUMMARY OF THE INVENTION
The present invention has for its object to overcome these drawbacks and to provide a machine of high output and low volume. The machine according to the invention is characterized to this end by the fact that the guide path comprises at the heating device a number of rows of preforms parallel to the direction of movement, at least twice as great as the number of parallel rows of preforms at the blow molding device.
Thus, while increasing the number of parallel rows of preforms at the heating device relative to the number of parallel rows along the rest of the circuit and particularly of the molding device, the production output can be very high, whilst considerably decreasing the overall size of the machine.
Preferably, the guide path comprises at the blow molding device a single row of preforms aligned in the direction of movement, whilst it comprises at the heating device a number of parallel rows of preforms comprised between two and twelve, preferably six.
There is thus obtained optimum adjustment of the heating time for the preforms adapted to the duration of molding or draw-blowing, permitting a high output with a very short guide path, hence with a reduced size of the machine.
According to a preferred embodiment, the blow molding device comprises at least one row of n mold cavities aligned parallel to the direction of movement, the guide path comprising at the heating device n rows of preforms parallel to the direction of movement.
Thus, the n preforms leaving the heating device can be directly loaded into the molding device with a single movement or transport cycle, which permits very reliable and sensible production.
According to a preferred embodiment, the guide path comprises a portion having a general U shape and a second portion connecting by a straight line the arms of the U.
In this embodiment, the first portion comprises the blow molding device, a device for loading produced receptacles and a device for loading preforms, the second portion comprising the heating device.
The central free space of the machine is thus used in an optimal manner for heating the preforms contained in the heating device serving also as a storage, which gives optimum arrangement of the various devices of the machine.
According to a preferred embodiment, each carrier comprises a plate mounted slidably on the guide path, each plate carrying two supports each adapted to receive one preform.
By this arrangement, the movement of the preforms is effected in a precise manner, not only in the heating device but also in the molding device. Moreover, the changes of direction of the transport are easily effected.
Preferably, the carriers are of generally rectangular form and comprise, aligned along their greater length, two bearings in which the supports are mounted and retained rotatably.
These supports can preferably be constituted by tubu
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patent: 3449792 (1969-06-01), Plummer
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patent: 4354813 (1982-10-01), Collumbin
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patent: 4963086 (1990-10-01), Wiatt et al.
patent: 5200134 (1993-04-01), Collombin et al.
patent: 5607706 (1997-03-01), Ingram
Davis Robert
Tetra Laval Holdings & Finance SA
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