TYING AND STABILIZATION SYSTEM OF PLASTIC FILM COVERING FOR LINEAR CULTIVATIONS

Abstract

The invention refers to a system for tying and stabilizing a plastic cover film for agricultural crops such as soft fruit covers. Cultivation in covered areas has been particularly developed in recent decades. The state of the art includes glass panes, greenhouses, and special plastic coverings for soft fruit. With the prior art, the placement, fastening and fixing of the plastic film is achieved with ropes or with elastic cords or with soft PVC tubing. However, the cost of binding the plastic film is significant as skilled staff and considerable amounts of man hours are required to tie the plastic film to the supporting structure. Tying the film, in most cases, is carried out by employing knots on simple eyelets or grommets, that the plastic films bear and, respectively, with knots on the wire ropes of the structure.

Claims

1. A system for tying and stabilizing a plastic cover film for agricultural cultivations such as greenhouses and soft fruit covers, comprising a first part that is adapted to be glued, heat-sealed or fused on a lengthway edge of the plastic cover film, wherein the first part has a specially formed eyelet bearing at least one hole, wherein the system further comprises at least three additional distinct parts which are in series and connected one to the next, wherein a second part and a fourth part of the system are produced by an injection moulding or 3D printing process, so that the second part is securely connected to the first part, wherein the fourth part is securely connectable to a wire rope and wherein the second part and the fourth part are connected with each other via a third part of the system being an elastic cord.

2. The system according to claim 1, wherein a) that the second part is a shaped accessory having a specially shaped head that enters or contacts the specially shaped hole of the first part and shaped notches in which the third part of the system enters from the side that has an open geometry and abuts at, at least one point spaced from the imaginary straight line that said notches form, and b) that the fourth part, through which the third part of the system is inserted, has in particular an open geometry on its one side, allowing easy insertion of the third part and contacts at, at least three points which form angles among them.

3. The system according to claim 2, wherein the third part of the system is a small calibre tube of plastic or elastic material which, when it enters the moulded notches and when the angle changes in the imaginary line of force exertion, it is deformed so as to increase the friction both between its walls and the respective sides of both the second part and fourth part into which it is placed, and between the inner walls of the small calibre tube to achieve greater overall friction.

4. The system according to claim 1, wherein the second part and the fourth part are made of durable materials such as polymers or elastomers whose natural or treated surfaces have a high coefficient of friction, so as to increase the total friction between these two parts and the third part passing through the second part and the fourth part.

5. The system according to claim 1, wherein the second part and the fourth part are coated with elastic or elastomeric materials which further increase the friction between the second part and the third part and respectively between the third part and the fourth part.

6. The system according to claim 1, wherein the third part is made of a viscoelastic material to automatically adapt its mechanical behaviour to the level of forces exerted on it.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Further aspects, advantages, features and properties of the present invention will become apparent from the claims and the following description of preferred embodiments with reference to the drawings, in which:

[0026] FIG. 1 depicts partially the covering system on the supporting structure;

[0027] FIGS. 2A 2C depict the tying/stabilizing system proposed in its entirety;

[0028] FIG. 3 depicts the first part of the system, the special eyelet on the plastic film;

[0029] FIG. 4 depicts the second part of the system the special accessory between the eyelet (first part of the system) and the tying material (third part of the system);

[0030] FIG. 5 depicts the tying material that is shown as it would bent inside the second and fourth part respectively;

[0031] FIGS. 6.1-6.4 depict the fourth and final part of the system;

[0032] FIGS. 7 and 8 depict alternative versions of the second part of the system; and

[0033] FIGS. 9.1-9.4 depict alternative versions of the fourth part of the system.

DETAILED DESCRIPTION

[0034] According to the principal embodiment of the invention a plastic film (FIG. 1) is produced from a polyolefin (LDPE, LLDPE, EVA etc.) or a combination thereof. The plastic film can be of any length (L) and width (W). The plastic film may have been produced by any known process of blown film in a monolayer or a multilayer format, in order to have the desired thermal, optical and mechanical properties, then the special eyelets are created which constitute the first part of the system (1) (FIG. 2) which may be glued, heat-sealed or preferably fused on the plastic film. The second part of the system (2) (FIG. 2) is produced in a different phase either by the injection moulding method or by 3D printing. The third part of the system (3) (FIG. 2) is the cord or small diameter tube produced in another production phase in a continuous extrusion method, from a suitable material such as, for example, soft PVC, silicone or rubber material. The third part enters the notches of the second part, being folded in the third part by forming a conceivable loop, the centre of which contacts the point 4E (FIG. 4) and simultaneously pulling the two ends of the cord into the formed slots or notches 4B and 4C (FIG. 4). This operation makes it very fast and therefore cost effective, to insert the tying material to the second part of the system, while avoiding knots that reduce the tying material's strength. The free end of the tying material enters the fourth part of the system (4) (FIG. 2) in the openings 6C and 6D adjacent to the points 6A and 61 (FIG. 6) of the fourth part of the system, while one side of the accessory is as in the second part configured so that the third part of the system enters with great ease and high speed. The end of the third part enters the formed notch 6E of the fourth part of the system (FIG. 6). The whole of the three parts of the system (2,3 & 4) enters the formed fastening position (1) (FIG. 2) with the head (4A, FIG. 4) of the second part of the system entering the formed attachment position (FIG. 3, A) which constitutes the first part of the system.

[0035] In a second embodiment of the invention the second part of the system, retaining the same way of inserting the third part of the system into its slots or notches, may have a different geometry (FIGS. 7 & 8). Also, the third part of the system may have different sections and cross sections. Also, the fourth part of the system may have a different geometry (FIG. 9) retaining however the features of having the notches, the change of direction to increase the exerted friction etc. It is obvious that the number of combinations of the four parts of the system that can occur is extremely large but most combinations can be equally effective.

[0036] In a third embodiment of the invention, the second part of the system may be a simple geometric shape such as a sphere, a cone, a rectangle, a square, a triangle having at least one hole or notch through which, one end of the third part of the system can be inserted and by making a free knot therein it does not allow the third part of the system to pass through the second part by pulling it in the direction of the third part that is inserted into the fourth part of the system.