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wrapping machine

A technology of pre-stretching around the axis, applied in the field of rotary ring wrapping machines, which can solve the problems of delaying the subsequent adjustment of the pre-stretching roller speed, insufficient, long time, etc.

Active Publication Date: 2022-06-28
AETNA GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because of the length and complexity of the motion drive, the amount of time required for an effective change in the speed of the pre-stretch rolls to be caused by a change in the speed of the electric motor is significantly longer
Delays in the feedback control of the pre-stretch rolls, especially when the wrapper is at high operating speeds, can cause the film to be overstressed on undesired parts of the load until the film breaks or the wrap tension in other parts of the load insufficient
[0025] When the control unit includes a sensor of the drive torque associated with the electric motor, the length and complexity of the drive unit results in delays in detecting changes in membrane wrap stress (since this change is detected by a sensor mounted on the motor), and further delays in Subsequent adjustment of pre-stretch roll speed

Method used

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Embodiment Construction

[0035] refer to figure 1 , schematically shows a wrapping machine 1 according to the invention, which is arranged to wrap a product or load, not shown, with a film 50 of plastic material, in particular a cold stretchable plastic film.

[0036] The wrapping machine 1 comprises frame means 2 , 3 arranged to rotatably support a support ring 4 or a rotating ring rotatable about the wrapping axis X by means of a first drive means 20 .

[0037] In the embodiment shown in the drawings, the wrapping machine 1 is of the so-called horizontal rotating ring type and is provided with a frame arrangement comprising: a main frame 2 provided with a plurality of support columns 25, such as two; and a support bracket 3 slidably connected to and supported by the main frame 2 and movable in a direction A parallel to the substantially vertical wrap axis X.

[0038] The support bracket 3 is designed to rotatably support the support ring 4 and is moved in the direction A by means of second actuatin...

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PUM

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Abstract

A wrapping machine (1) for wrapping a product with a plastic film (50) comprising: a frame device (2, 3); a support ring (4) rotatably supported by the frame device (2, 3) support; an unwinding unit (5) supporting a reel (51) of said film (50) and a pair of pre-stretching rollers (52, 53), and at least one pre-stretching motor (6, 7), which Fixed to the frame device (2, 3), the pre-stretching rollers (52, 53) are rotated by a corresponding transmission assembly (8, 9); the transmission assembly (8, 9) includes: rings (11, 12) which are rotatably supported by the frame means (2, 3) and which are rotated about the wrapping axis (X) by pretensioning motors (6, 7) with friction rollers (13, 14); and A drive belt (15, 16), which is rotated by said drive ring (11, 12), is connected to at least one pre-tensioning roller (52, 53).

Description

technical field [0001] The present invention relates to a machine for wrapping a load with a cold stretchable plastic film or wrap, and in particular to a rotary ring wrapping machine. Background technique [0002] Known wrapping machines include an unwinding device that supports a reel from which the plastic film is unwound for wrapping around the load, so that due to a combination of relative linear and rotational movements between the wrapping device and the load A series of strips or belts are formed with a helical arrangement, the latter ie the load being formed by one or more products, eg arranged on trays or shelves. [0003] In a horizontal rotary ring wrapping machine, the load remains static during the packaging process, while the unwinding device moves relative to the latter, ie, the load, by rotating about the vertical wrapping axis and by translating along the wrapping axis. For this purpose, the unwinding device is fixed to a ring structure, a so-called rotati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65B11/02B65B11/00
CPCB65B11/025B65B2011/002B65B2210/18B65B11/585
Inventor M·塞雷
Owner AETNA GROUP