FI85091B - Method for securing a film used in surface cultivation - Google Patents

Description

85091

The invention relates to a method for attaching a film for use in roofing to a cultivated surface, in which method the film is applied to the surface to be cultivated and, when applied to the film, the film is sewn to a cavity which is inclined in a direction perpendicular to the ground surface, and the stitching sewing thread is inserted into said inclined cavity 10 as a stitching stitch.

As is already known, plants have been grown in greenhouses with covers made of glass or plastic. Kate calculates both short- and long-wave radiation through the visible light region. Greenhouse roofs are known to transmit more shortwave radiation than longwave radiation, resulting in more ultraviolet radiation entering the greenhouse. Thus, in greenhouses, light heats up as shortwave radiation is converted to heat inside the greenhouse.

As is already known, the greenhouse principle has been utilized in the fields in that the coverings are formed as arches above the surface of the field or in such a way that the cover is applied to the ground surface. The roofing material used in these field applications has been plastic or paper through which the plants grow. The following advantages have been achieved with this known technique: the temperature has been raised as the short-wave radiation is converted into heat, the moisture retention has been better than when cultivating without cover. In addition, when using an opaque film, weeds may have been introduced.

As is already known, the films are fixed to the ground in such a way that, when the film is applied, the longitudinal edges of the film are covered with a layer of soil. Usually the film is first applied and then the seeds are sown and / or the plants are planted. Such methods have been used, for example, in corn cultivation. And the advantage is a higher yield.

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However, a disadvantage of the previously known methods has been that the herbicide has been used at least as much as without film cultivation, in some cases even more because of the exposed soil between the membranes (the embankment used to attach the film), which increases the growth potential of the weeds.

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A further disadvantage of the previously known solutions has been that it has not been possible to cover only about 50-70% of the cultivated surface area with the film, because it has been necessary to leave exposed land between the films for the embankment embankment.

10 The applicant's earlier Finnish patent application 891905 discloses a method for attaching a film used in roof cultivation. In this prior application, it has been considered new that in the method, when the film is applied, the film is sewn to the surface to be cultivated by stitching.

The main object of the present invention is to provide a method for attaching a film to a cultivated surface, which is an improvement on the applicant's previous solution in that the aim is to improve the adhesion of the sewing thread to the soil.

It is also an object of the invention to provide a method for attaching a film which does not suffer from the disadvantages of previously known methods.

The method according to the invention is mainly characterized in that the ground is pressed on the seam of the oblique stitching.

In addition, other advantageous features of the invention are set out in claims 2-5. When using the method according to the invention for attaching a film used in roof cultivation to a cultivated surface, the sewing thread adheres very well to the soil, because the adhesion is improved by the fact that the stitching seam is skewed and the ground at the sewing point is pressed tightly over the sewing point.

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By attaching the film to the cultivated surface according to the invention, the entire cultivated area can be covered with the film.

In connection with the method according to the invention, UV-degradable films are preferably used, because when the method according to the invention is used the film decomposes completely, since it is located entirely on the ground. In connection with the method according to the invention, biodegradable cover films, i.e. decaying covers, are also equally advantageously available. When using the method according to the invention, it is also possible to use a film made of non-degradable material, which can be easily lifted off by first removing the sewing thread by first pulling on the ends of the sewing thread.

The method according to the invention will now be described in more detail with reference to the figures of the accompanying drawing, in which IS Fig. 1 shows a diagram of films applied to the field and Fig. 2 schematically shows a cross-section A-A of Fig. 1.

According to Figure 1, the films 10 are applied to the field side by side. The film 10 is fixed to the ground 20 by stitching 11. The stitching 11 is placed on each edge of the films 10 and / or at the edges and in the middle of the film 10. The number and placement of the stitches 11 depend on the width of the film 10 and the adhesion properties of the ground 12.

The direction of travel of the stitching 11 is indicated in Fig. 1 by the reference numeral S.

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According to Fig. 2, the stitch 13 of the stitching 11 protrudes into the ground to a certain depth C and is at an angle K to the direction 12 perpendicular to the direction of the ground surface 12. The magnitudes of the angle K and the depth C depend on the soil. The angle K is 40 ° -60 °, preferably about 45 ° -55 °. When the stitch 13 of the stitching 11 is inclined with respect to the ground, i.e. at an angle 30 K to the vertical Y, the stitch 13 of the stitching 11 remains well attached to the ground 12.

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The angle K is formed in the direction opposite to the forward direction S of the stitching 11, i.e. backwards.

The spacing b of the stitching 11 used (Fig. 1) is typically 100-500 mm, the width of the sewing thread 5 used varies from 1 to 100 mm, preferably 5-50 mm, and the width a of the film 10 is 0.5-8 meters depending on the plant. For wider films 10 several stitches 11 are used, e.g. for 1350 mm wide film 10 stitch 11 is used on each edge, but for e.g. 2700 mm wide film it is suitable to use three stitches 11 so that one stitch 11 is located in the middle of the film.

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The depth C of the stitch 13 of the stitching 11 (Figs. 2A, 2B) varies depending on the quality of the soil. Depth C is e.g. 50-200 mm.

Depending on the soil, the appropriate depth C, length L, angle K and width of the sewing thread 15 of the stitch 13 are selected.

As the sewing thread material, for example, the same material used in the film is used, which material may be non-degradable or degradable either by UV radiation or biodegradable. For example, various plastics and papers are suitable as film and 20 sewing thread materials.

The film used is preferably an opaque film in which light-transmitting areas are made on the plants. The light-transmitting point can be made mechanically, optically or by mechano-optical methods. It is also possible to make a flap at the crop 25 for the light-transmitting area where the plant can easily grow. After applying and fixing the film, a seed or plant can be sown at the flap. Thus, there is no need to use toxins and perform mechanical weeding.

The invention has been described above with reference only to a preferred embodiment thereof. However, this is in no way intended to limit the invention to this 5 35091 example only, but many modifications and variations are possible within the scope of the inventive idea defined by the following claims.

Claims (2)

6 85091 A method of attaching a film used for roofing to a cultivated surface (12), the method comprising applying the film (10) to the cultivated surface (12) and sewing the film (10) onto the cultivated surface (12) by applying the film (10). a hole is formed in the membrane (10) and a cavity in the ground (12), which cavity is inclined to the ground direction perpendicular to the direction (Y), and the sewing thread of the stitch (11) is introduced into said oblique cavity as a stitch (13); (12) is pressed over the stitch (13) 10 of the oblique stitching (11). A method according to claim 1, characterized in that in the method the sewing thread of the stitching (11) is pressed between the previous stitch (13) and the stitch (13) to be made against the ground surface (12) to prevent the stitching (11) from unwinding. 7 85091