FR2606365A1 - Method and device for packaging loads by means of extendible films with a self-adhesive face and by means of extendible nets - Google Patents

Abstract

The device includes a frame on which is placed a plate, supporting the said load to be packaged; an assembly 9, 9A for supporting the reel of film; two flanges 10, 10A which are movable in rotation with respect to the support 9, 9A, carrying rollers 1 and 2; a device with pulleys 4, 5 and belts 6 connecting the said rollers 1 and 2; a return roller 11; and means 7 for disengaging and releasing the tension of the film.

Description

The present invention relates to a method and a device for packaging palletized loads with self-adhesive stretch plastic films and stretch nets.

The device comprises a frame on which the turntable which supports the load is placed and a support column for the reel holder carriage
This carriage can be fixed for straight wrapping or mobile for helical wrapping.

This device can also be applied to the principle of wrapping said by rotating arm. In this case the coil describes a circle around the palette to enclose the ehstrae

The paddle can be fixed, or movable in rotation in the opposite direction of the movement of the arm.

We already know a process which consists in braking by mechanical or electrical means the unwinding of the film reel.

This method has the disadvantage of pulling on the load to lengthen the film and to find its clamping force. In addition, the braking being carried out in the axis of the coil; The braking force is different as the radius of the coil decreases.

We also know 10) a system with contour roller braked by electromagnetic brake.

In this case these always the load which exerts the tensile force to ensure the stretching of the film.

 2 ") A stretching system with 2 pairs of rollers.

collante.This principle presents the disadvantage of not being adjustable in stretching according to the film, the load and of not being provided for the use of films with a

sticky.

Some producers put the self-adhesive side of the film inside the winding, which implies an opposite direction to the clockwise direction. [fig- 1]
Other producers put the adhesive side on the outside, which implies a direction of unwinding identical to clockwise. [fig-2]
Or conversely fig 1A and 2A
In addition, stretch films have very significant elongation possibilities, hence the need for a simple adjustable system making it possible to adapt very easily to the loads to be wrapped and to the different types of films.

The present device consists of - rollers of different diameters fig -3 (rep 1 & 2) rotating in the same direction, these rollers are covered with non-slip tape.

These rollers are interconnected by stepped pulleys (rep 4 & 5) and a belt (rep 6).

This MECHANICAL PRE-STRETCHING of a very simple and economic operation is provided with a declutching system (fig 3 rep 7) allowing to release the tension of the film.

The declutching system is manually controlled on manual and semi-automatic machines and aims to release a certain length of film, without any particular effort for the operator in order to allow hooking on the pallet.

On automatic machines equipped with a film gripping system (fig 4 rep 8), it is controlled by pneumatic valve or by electromagnet and will release the MECHANICAL PRE-STRETCH during the hanging of the film. the first turns to allow blocking of the film by overlap.

This MECHANICAL PRE-STRETCHING device (fig 5 & 5A) consists of a set 9 and 9A, support for the film reel, movable flanges 10 and 10A support for the rollers
On the flanges are fixed the MECHANICAL PRE-STRETCHING rollers (1 & 2) the deflection roller (11) and possibly the direction reversal roller (12) according to the film winding mode with self-adhesive side.

These flanges move from right to left to allow the coils to be changed and from left to right to compensate for the decrease in the diameter of the coils.

The displacement of these flanges is carried out in an arc of a circle R (FIG. 5) in such a way that the point of contact passes always through the center of the film reel and the center of the reversing roller (12) ′ or of the roller. PRE-DRAWING (1). ''
The adjustment of the percentage of stretching is carried out by moving the belt 6 over the stepped pulleys (Fig 3).

In addition, for certain hot stretch films, the PRE-DRAWING roller (2) can be heated by a liquid circulating inside.

We see from the device according to the invention, we can stretch the plastic films with a self-adhesive side and the nets by optimizing productivity and improving the resistance of loads. This invention finds its application in all industries, it is not limited to the description which has just been given, but on the contrary covers all the variants which could be made to it without departing from its scope or its spirit.

Claims (2)

SELL ICATIONS i?) Device for packaging loads by means of stretchy plastic or self-adhesive films, characterized in that it comprises a frame on which a tray is placed, supporting said load to be packaged; a support assembly (9,9A) of the film box; of them . flanges (10,10A) movable in rotation relative to the support (9,9A), carrying rollers (1) and (2); a device with pulleys (4,5) and belts (6) connecting said rollers (1, and 2); a deflection roller (11); and disengaging means (7) and release of the tension of the film. 20) Load packaging device according to claim 1 characterized in that the two flanges (10,10A) are mobileSen rotation relative to the support (9,9A) so as to maintain contact between the film reel and the roll (1), and that the center of the roll (1) moves on an arc passing through the center of the film reel. 39) Load packaging device according to claim 1 characterized in that it comprises a direction reversal roller (12); and in that the two flanges (10,1OA) are rotatable relative to the support assembly (9,9A) so as to maintain contact between the film reel and this direction reversing roller (12) and that the center of the direction reversing roller (12) moves on an arc passing through the center of the film reel. 40) Load packaging device according to any one of the preceding claims, characterized in that it comprises a gripping system (8) of the film. 5fil) Load packaging device according to any one of the preceding claims, characterized in that the plate supporting the load to be packaged is rotatable. 60) Device for packaging loads according to any one of claims 1 to 4 characterized in that the support assembly (9,9A) and the flanges (10,1or) are movable in rotation around the top plate pnrtan + the load to wrap. 7) Device for packaging loads according to any one of the preceding claims, characterized in that the rollers (1) and (2) are of different diameter.  80) Load wrapping device  according to any one of the preceding claims, characterized in that the rollers (1) and t2) rotate in  the same way.  90) Load wrapping device  according to any one of the preceding claims, characterized in that the rollers) and (2) are covered with non-slip strips.  100) Device for packaging loads according to any one of the preceding claims, characterized in that the roller (2) can be heated by a liquid circulating inside it.