Reject chutes are generally mounted below the tool of an injection moulding machine and serve to separate the material flow. A further field of application is the use below a stamping machine. The body of the reject chute consists of stable welded stainless steel and disposes of a moveable flap which divides the material flow into two channels (2-way chute). Alternatively there are versions with two flaps available (3-way chutes).
The reject chutes have different functions:
As standard reject chute they are used to discharge start-up or reject parts. A signal from the control unit of the machine switches over the chute flap and to conduct the reject parts into a separate container. In the function of a QA-chute, a shot is discharged automatically for QA-check in regular intervals. A further field of application of reject chutes is sprue separation. Here the devices are used as separation chute, selection flap, sprue chute, i.e. with every shot, there is a switch of the chute. Thus, the good parts are conducted into one channel, the sprue parts into the other.
Depending on the control unit, also start-up and reject parts can be added to the sprues. This would be a combination of QA-chute and separation chute for runners.
Next to the two-way reject chutes, there are three-way reject chutes available, as well. These chutes often serve as combination of QA-chute and separation chute. Thus, the good parts can be conducted into container A, the reject parts into container B and the sprue parts into container C.
In some cases, the reject chutes are used for buffering applications, i.e. a container is filled with a defined number of production cycles, afterwards the flap switches over and the next container is filled.All reject chutes are designed individually according to the machine and the intended task.
The reject chutes serve for automation of the procaution process and contribute to quality management.
Reject Chute for Engel e-motion 200/100
In this case, the reject chute is mounted across the axis of an injection moulding machine type Engel e-motion 200/100. Therefore the chute optionally discharges the parts centrally downwards into a reject bin or to the operating side onto a conveyor. Plastic cascades are inserted to the completely closed guiding chute, in order to slow down the parts. As in this case the parts are very small and statically charged, it is ensured that the parts placed settled at the center of the belt. Here, the flap within the separation chute is made of plastics. This enables to minimalise the gap between flap and chute body, in order to prevent parts from getting stuck. The reject chute is controlled via a ...
MTF Technik Fördertechnik - Reject Chute for Engel ES 80/20 HL
This QA-chute is mounted below the tool of an injection moulding machine of type Engel ES 80/20 HL. The body of the reject chute is engineered as completely closed tunnel design. The outlets are directed centrally downwards and also to the operator side of the injection moulding machine, out of the machine base.
MTF Technik Fördertechnik - Reject Chute for Engel ES 200/40
In this version, the reject chute is mounted alongside within the machine base of the injection moulding machine. Start-up parts, sprues and runners fall vertically downwards into a box which is positioned directly below the tool in the machine base. The good parts are handed over to a conveyor which is mounted alongside within the machine base. The drop out chute is closed at the front side, therfore the parts fall vertically on the conveyor and do not jump from the conveyor. Moreover, the conveyor is covered with a plate after the dropout opening of the reject chute. The parts are directed via a plastics changeover flap, in order to keep the gaps as small as possible. The flap is ...
MTF Technik Fördertechnik - Reject Chute for Engel ES 330/100 HL
This QA reject chute is mounted below the tool of an injection moulding machine of type Engel ES 330/100 HL. The chute body is engineered as completely closed tunnel design. The outlets are directed centrally downwards and to the operator side of the injection moulding machine. The slide has an extra extension plate.
MTF Technik Fördertechnik - Reject Chute for Engel Victory 200-80
In this version, the reject chute is mounted below the tool with an outlet to the operator side and one downwards, in direction of the clamping side of the injection moulding machine. The separation chute discharges sprues and scrap parts into a box at the operator side, and the good parts are transported by a conveyor. In the illustration below, the Z-angled conveyor is equipped with a further diverter valve at the end. This diverter valve switches after reaching a certain number of parts in the box, thus serves as buffering device.
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