Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1988-10-19
1991-09-10
Gallagher, John J.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
100 92, 100214, 156281, 1563084, 156312, 156536, 1565831, 156598, 219243, A63B 3900, B32B 3120
Patent
active
050471058
DESCRIPTION:
BRIEF SUMMARY
The present invention has for an object an improvement in the process for forming the bottom of a flexible sachet of flexible synthetic material starting from a cushion of synthetic material filled with liquid, for imparting an improved stability to the flexible sachet. The present invention also has for its object a device for carrying out such a process.
French Patent No. 83 18255, corresponding to European Patent No. 0142456, discloses a process in which a filled cushion is disposed on a support beam of a width less than the width of the cushion in such manner that the two lower corners of the cushion overhang the beam, depending downwardly. In applying a gripper to each side of the beam, the exerted grasping force expels the liquid contained in the two corners, and welds are produced along two lines to give stability to the sachet by forming two lugs corresponding to the corners.
Although this process gives full satisfaction, it has appeared that it is still possible to improve it.
In fact, when the jaws of the gripper come into application on the corners to expel the liquid contained therein, there is risk of sometimes obtaining an imperfect evacuation of the liquid, since the exerted force is exerted perpendicularly to the plane of the said corners.
In order to avoid this there is proposed, according to the present invention, a process in which the grippers each comprise a cheek piece having a convex surface which cooperates with a counter-abutment surface which is plane or itself constituted by an identical cheek piece, the said cheek pieces being articulated on the gripper in such manner that, in the advance of the latter towards the corner to be welded, the point of contact of the cheek piece on the corner of the sachet is displaced progressively upwards, in such manner as progressively to expel upwards the liquid contained in the said corner, that is to say towards the interior of the sachet.
The invention will be better understood with the aid of the description given below of a form of embodiment given by way of non-limitative example, with reference to the accompanying drawings wherein:
FIG. 1 is a perspective view of a gripper for carrying out the process according to the invention, at rest;
FIG. 2 is a view identical with that in FIG. 1, in the final welding position.
The device is composed for example of a pair of jaws (100, 101) translationally movable in a horizontal plane in relation to one another, for example under the action of cylinder-piston units such as (102).
On their front faces these jaws are equipped with welding means (103, 104) known per se, which will not be described in further detail.
On the lower face of each jaw there is attached a cheek piece (105, 106) rotatably articulated thereon about an axis (107, 108).
The cheek pieces are thrust by pressure tending to keep them protruding, in the direction towards one another, by an elastic means such as a spring (109) or a leaf spring (110).
In the carrying out of the process of the present invention, one corner of the sachet is disposed between the two cheek pieces and the jaws, respectively. At this stage it is filled with liquid.
In order to expel this liquid the two jaws are moved closer to one another, and then come into contact by the lower extremities (111, 112) of their respective cheek pieces. As the jaws (100, 101) approach one another, the point of contact between the cheek pieces rises, thus expelling the liquid from the inserted corner.
In the final position, as represented in FIG. 2, the cheek pieces are in contact by their upper extremities (113, 114). The liquid is totally expelled and the welding is effected by the jaws.
Of course a certain number of variants may be applied. Thus for example one of the jaws can comprise only a plane blade perpendicular to the horizontal plane of the jaws, the other jaw comprising a cheek piece as described above.
1. A process for forming a lug in a sachet formed of a flexible synthetic material which contains a liquid, comprising the steps of: opposing welding jaws, the first w
Gallagher John J.
Societe Generale des Faux Minerals de Vittel
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