Blow molding machine comprising a temperature regulating device

Abstract

Provided is a machine and method for reshaping plastic parisons into plastic containers, with a mold which has a cavity for the plastic parison to be reshaped, wherein this mold has at least two blow mold parts, wherein each of these blow mold parts has an inner wall which is suitable for forming a region of the plastic parison to be reshaped, wherein these blow mold parts are mounted movably with respect to one another between an open position, in which the blow mold parts are at least partially separated from one another, and a closed position, in which the blow mold parts abut one another, in order together to form the cavity for reshaping the plastic parisons.

Claims

1. A machine for reshaping plastic parisons into plastic containers, with a mold which has a cavity for the plastic parison to be reshaped, wherein this mold has at least two blow mold parts, wherein each of these blow mold parts has an inner wall which is suitable for forming a region of the plastic parison to be reshaped and wherein these blow mold parts are mounted movably with respect to one another between an open position, in which the blow mold parts are at least partially separated from one another, and a closed position, in which the blow mold parts abut one another, in order together to form the cavity for reshaping the plastic parisons; at least two blow mold support shells, wherein a blow mold part is fastened releasably to each of these blow mold support shells; a thermal regulating device of the mold, which has at least one heating device which is suitable for heat exchange with the mold; wherein the heating device is arranged at least partially and completely in at least one blow mold part, wherein the machine has a temperature detection device for detecting a temperature of the mold, wherein the temperature detection device is arranged at least partially in at least one of the blow mold support shells and/or in a support device, which is configured to support the blow mold support shells.

2. The machine according to claim 1, wherein the heating device is an electrically operated heating device.

3. The machine according to claim 2, wherein at least one first electrical contact element is arranged on the blow mold part in order to connect the heating device electrically to the blow mold part.

4. The machine according to claim 3, wherein in a state in which the blow mold part is mounted on a blow mold support shell, the at least one first electrical contact element is arranged on a surface of the blow mold part facing the blow mold support shell.

5. The machine according to claim 4, wherein a second electrical contact element is arranged on the blow mold support shell and in a mounted state is in electrically conductive contact with the first electrical contact element.

6. The machine according to claim 1, wherein an electrical connection for electrical supply to the heating element can be automatically released or separated.

7. The machine according to claim 1, wherein the temperature detection device is suitable and intended for determining a temperature of at least one region of the blow mold parts.

8. The machine according to claim 1 wherein the regulating device has a control device which controls the at least one heating device as a function of at least one value detected by the temperature detection device.

9. An arrangement for reshaping plastic parisons into plastic containers with a plurality of devices according to claim 1, wherein these devices are arranged on a movable and in particular rotatable support.

10. A method for reshaping plastic parisons into plastic containers by a mold which has a cavity for the plastic parison to be reshaped, and wherein the mold has two blow mold parts, wherein each of the blow mold parts has an inner wall which forms a region of the plastic parison to be reshaped, the method comprising: moving the blow mold parts with respect to one another between an open position, in which the blow mold parts are at least partially separated from one another, and a closed position, in which the blow mold parts abut one another, in order together to form the cavity for reshaping the plastic parisons; providing at least two blow mold support shells, wherein a blow mold part is fastened releasably to each of these blow mold support shells; and heating with a heating device the mold at least intermittently, wherein the heating device is arranged at least partially and completely in at least one blow mold part, wherein a temperature detection device for detecting a temperature of the mold is provided, and wherein the temperature detection device is arranged at least partially in at least one of the blow mold support shells and/or in a support device, which is configured to support the blow mold support shells.

Description

BRIEF DESCRIPTION

(1) Some of the embodiments will be described in detail, with reference to the following figures, wherein like designations denote like members, wherein:

(2) FIG. 1 shows a machine according to embodiments of the invention in a first embodiment;

(3) FIG. 2 shows a machine according to embodiments of the invention in a second embodiment; and

(4) FIG. 3 shows a machine according to embodiments of the invention in a third embodiment.

DETAILED DESCRIPTION

(5) FIG. 1 shows a representation of a reshaping station 1 in a first embodiment. In this case two blow mold support parts 52 and 54 are provided. These blow mold support parts 52 and 54 are pivotable with respect to one another, in order in this way to open and to close the blow mold. Blow mold support shells 42 and 44 are arranged respectively on the blow mold support parts 52 and 54. In this case these blow mold support shells, or the parts thereof can be screwed for example onto the blow mold support parts 52 and 54 (also generally designated above as the support device). The reference 36 relates to a sealing device and the reference 34 relates to a mounting plate.

(6) The blow mold support parts 22 and 24 are in turn arranged on the blow mold support shells 42 and 44. The plastic parison 10 is pressed against the mold formed here by the side parts 22 and 24 or against the inner wall 26 thereof. The blow mold parts 22, 24 are components of the mold designated by 2.

(7) The reference 8 designates a temperature sensor. Two temperature sensors are provided here which are provided respectively in the blow mold support shells 42 and 44, but extend with their end portions into the blow mold parts 22 and 24.

(8) The references 62 relate to heating elements or heating devices which are arranged here in the blow mold parts 22 or 24. In this case these heating elements 62 can be rod-shaped or pin-shaped and extend here perpendicular to the drawing plane and/or perpendicular to the longitudinal direction of the plastic parisons.

(9) The reference 6 relates schematically to a regulating device for the mold 2, more precisely for a temperature of the blow mold parts 22, 24. This regulating device has at least the heating device 62, the temperature detection device or the temperature sensor 8 and a control and/or regulating device 66 (only schematically illustrated).

(10) The arrangement of the heating elements illustrated in FIG. 1 produces a very small distance d between the heating elements and the hollow body or plastic parison 10.

(11) The references 35 relate to insulations which here are arranged spaced apart from one another in the peripheral direction.

(12) Furthermore, the blow mold parts 22 and 24 have contact elements, in order to contact the heating devices 62 or to supply them with electrical power. In this case, in the event of a change of the blow mold or the blow mold parts 22 and 24, these electrical connections can be automatically disconnected and connected again.

(13) FIG. 2 shows a further embodiment of a machine according to the invention. In this embodiment there is a significant difference from the embodiment illustrated in FIG. 1 in that here the heating devices 62 are not arranged in the blow mold parts 22 and 24, but in the blow mold support shells 42, 44. In this way the distance d between the heating devices and the hollow body 10 is significantly greater than in the embodiment event illustrated in FIG. 1. However, the advantage is that no electrical connections must be broken or made when the blow mold parts 22, 24 are changed.

(14) The reference 32 designates a channel through which a coolant can flow. In this way a cooling of the blow mold parts is also possible. As mentioned above, in this way a precise temperature of the blow mold parts 22 and 24 and of the base part (not shown) can be set.

(15) FIG. 3 shows a further embodiment of a machine according to the invention. In this embodiment a first heating device 62 is provided in the form of a heating mat which is arranged here between the blow mold side parts 22 and 24 and the support shells 42 and 44. In this way the distance d between the plastic parison 10 and the heating elements increases relative to the embodiment shown in FIG. 1, but decreases relative to the embodiment shown in FIG. 2. It is also possible here that the heating mat 62 remains on the mold support shells 42 and 44. Advantageously, however the heating mat here is also arranged on the blow mold and is therefore changed therewith.

(16) The references 64 relate to second heating devices which are arranged here in the blow mold supports 52 and 54. In this way, as mentioned above, heating can be quicker due to the use of all heating devices.

(17) In the embodiment illustrated in FIG. 3 the temperature measuring devices 8 are arranged substantially within the blow mold parts 22 and 24. In this way a more direct measurement of the temperature of the inner wall of the blow mold device 2 can be achieved.

(18) On the other hand, in the embodiment shown in FIG. 2 the temperature measuring device is arranged substantially in the blow mold support shells 42 and 44 and, however, contacts the blow mold side parts 22 and 24 as also in the embodiment shown in FIG. 1.

(19) Although the present invention has been disclosed in the form of preferred embodiments and variations thereon, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the invention.

(20) For the sake of clarity, it is to be understood that the use of “a” or “an” throughout this application does not exclude a plurality, and “comprising” does not exclude other steps or elements. The mention of a “unit” or a “module” does not preclude the use of more than one unit or module.

LIST OF REFERENCES

(21) 1 reshaping station 2 mold 6 regulating device 8 temperature measuring device, sensor 10 plastic parison 22, 24 blow mold parts 32 channel 34 mounting plate 35 insulation 36 sealing device 42, 44 support shells 52, 54 support devices 62 heating device 66 control device d spacing