JPS605461B2 - Perforated sheet for greenhouse and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in perforated sheets for greenhouses and methods of manufacturing the same.

Conventionally, greenhouse sheets have been made of a rectangular main body sheet made of a flexible sheet such as vinyl or polyethylene, with a large number of through holes placed in the middle part in the width direction and along the length direction. One side of the cover sheet, which is made of the same material, has the same length, and is narrower than this, is welded to the outside of the through-hole section of the main sheet in the width direction, so that the through-hole section can be opened and closed with the cover sheet. It is known that it is covered.

During normal use, this greenhouse sheet covers the perforated part of the main sheet with a cover sheet to maintain good heat retention inside the sheet, and when ventilation is required, the cover sheet covers the perforated part of the main sheet. By moving the sheet in the width direction so that at least a portion of the sheet is located outside the perforated portion of the main body sheet, the through holes are opened and ventilation is carried out inside and outside the main sheet through these through holes. I have to. However, such conventional greenhouse sheets require time and effort to manufacture because it is necessary to pre-manufacture two types of main sheets and cover sheets of different sizes and weld these sheets at the required locations. In addition to being unsuitable for mass production, the manufactured greenhouse sheet has double layers of the main sheet and cover sheet at the middle part in the width direction, so it is twice as thick as the two sides, making it difficult to transport. If a large number of them are stacked one on top of the other during storage, the central part will bulge, resulting in poor stability and difficulty in transportation and storage.

The present invention uses a fan-flat cylindrical film, punches a through hole in the middle part in the width direction on only one side of the film, welds both sides of the film, and then A greenhouse perforated sheet that solves the above-mentioned problems by forming a separation line on the sheet, is easy to manufacture, is suitable for mass production, has good stability even when laminated in large numbers, and is easy to transport and store, and its manufacturing method. is intended to provide.
That is, in the present invention, a large number of through holes are formed along the length direction of the film in the middle part in the width direction of only one side of a fan-flat cylindrical film with both ends closed, and the through holes of the film are A linear welded part in which both sides of the film are welded to each other is formed along the length direction of the film on one side outward in the width direction, and on the opposite side of the film to the side where the through hole is made, This is a perforated sheet for a greenhouse in which tearing lines are formed along the length direction of the film, and are located on the outside of the perforated part on the pond side in the film width direction and on the outside of the welded part on one side in the film width direction. Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

In FIGS. 1 and 2, 1 is a flat cylindrical film made of a flexible material such as vinyl or polyethylene and closed at both ends 2. In FIG.

This cylindrical film is arranged in a spirally wound state on the entrance side of the punching machine 3, as shown in FIG. The drilling machine 3 is
Utility Model Registration No. 939787 (Utility Model Registration No. 939787
This method is known as JP-A No. 2003-120033, and uses a method in which an arc-shaped blade plate 5 on which a circular blade surface 4 is formed is rotated, and a sheet or film is perforated by these rotations.

In addition, during perforation, the tip of the needle 6 provided at the lower end of the rotation center axis of the blade plate 5 is used to momentarily stop the sheet or film moving at a constant speed, and while the blade is stopped, the blade surface 4 is rotated to remove the sheet or the like. perforate. By doing so, circular holes can be formed accurately and holes can be punched without leaving any uncut portions attached to sheets, etc., making it suitable for punching vinyl films and the like. - A punching tool 7 is inserted into the film 1 through the opening 2 at the tip of the cylindrical film so as to be perpendicular to the longitudinal direction of the film.

As shown in FIG. 3, FIG. 4, and FIG. 5, the punching mold 7 of the embodiment is made of a metal plate material, and a long hole 8 extending in the length direction of the film 1 is formed in the upper plate. A hollow portion 9 is formed between and the bottom plate 10. The punching mold 7 is inserted into the film with the elongated hole 8 facing up and down, and is moved onto an elevating plate 11 arranged directly below the punching part of the punching machine 3. As the lifting plate 11 is raised and lowered at a constant period and a constant height by a lifting mechanism (not shown), the punching mold 7 is also raised and lowered, and the punching mold 7 is raised and lowered at the moment when the tip of the needle 6 reaches the lowest point. It is set to be at the top. Note that the punching mold 7 is not limited to a metal plate, and may be a molded piece of hard plastic or a processed piece of plywood, and the shape and number of the holes 8 can be changed as appropriate.

Further, in FIG. 3, reference numeral 17 is a stopper punch made of an iron pipe or the like, and the stopper punch 17 prevents the punching tool 7 from being pulled in this direction when the film 1 moves in the direction of the arrow 18. In order to prevent this, the film is attached to the winding side of the lifting plate 11 so as to be able to slide from above and below.

19 is a displacement prevention plate, and the displacement prevention plate 19 is provided on the elevating plate 11 in order to prevent the punching mold 7 from shifting in the width direction of the film 1, that is, in the left-right direction.

By doing as described above, the punching tool 7 is placed on the lifting plate 11.
Even if it tries to displace back and forth, from side to side, the two stopper villages 17 and two anti-slip plates 19 prevent the drilling tool 7 from shifting its position. As shown in FIG. 7, the upper surface 13 of the film
In particular, a plurality of through holes 12 are arranged in a row in the width direction at the middle portion in the width direction, and a large number of these through holes 12 are formed at regular intervals along the length direction of the film 1. Thereafter, the upper and lower surfaces 13 and 16 of the film are welded to each other on one side in the width direction near the perforation of the film through hole 12, and a linear welded part 14 is formed along the length direction of the film 1. It is formed. Simultaneously with or after the formation of the welded portion 14, separation lines 15, 15 are formed along the longitudinal direction of the film on the lower surface 16 opposite to the upper surface 13 in which the through hole 12 is formed, using an appropriate cutter. These separation lines 15 and 15 are arranged on the other side of the film in the width direction near the perforated portion of the through hole 12 and on the outside of the film in the width direction of the film near the twilling portion 14, respectively. Although it is most desirable to perform the welding and separation processes on one line in succession with the perforation process described above, it is provided as an intermediate material that has undergone the perforation process and the settling process, and when used, it can be placed in the above-mentioned position of the film. It is also possible to form and use a separation line.

The perforated sheet for greenhouse according to the example manufactured as described above is stored and transported in a spirally wound state, and when used, it is cut into a length matching the length of the greenhouse. As shown in FIG. 9, a wide main body sheet 20 having portions extending from the separation lines 15, 15 to both sides of the perforated portion of the through hole 12;
The main body sheet 20 and one side portion are connected at the welding portion 14, and a narrow cover sheet 21 covering the perforated portion of the through hole 12 is placed in a stacked state.

From this state, the main sheet 20 is placed inside the greenhouse and the cover sheet 21 is placed outside, and as shown in FIGS. In addition, a string 23 made of vinyl or the like is stretched on the outside of the perforated greenhouse sheet of this embodiment. In normal cases, the perforated portion of the through hole 12 of the main body sheet 20 is covered with a cover sheet 21 as shown in FIGS. 10 and 11, and when ventilation in the house is required, as shown in FIG. As shown in FIG. 13, the through hole 12 is opened by moving or pulling the cover sheet 21 toward the welded portion 14 as appropriate. still,
Although not shown, a shielding cover can be hung over the front entrance of the house. As explained above, the perforated sheet for greenhouses of the present invention has through holes on only one side of the flat cylindrical film with both ends closed, and two separation lines on the opposite side to the side where the through holes are provided. , respectively, and the two surfaces are welded to each other on one side in the width direction of the through-hole bored part,
When not in use, it has a nearly fan-flat cylindrical shape and each part in the width direction has the same thickness, so when it is wound in a spiral or stacked, it is possible to maintain a uniform thickness in the width direction. Therefore, it has excellent stability during storage, is less likely to collapse during transportation, is easy to handle, and can be stored in long lengths and cut to the desired length just before use, making it possible to adjust the length of the greenhouse. We can easily provide compatible products.

In addition, the method for manufacturing the perforated sheet for greenhouse according to the present invention is to perform the perforation and settling process with the fan-flat cylindrical film as it is, and then to separate it at two places. Since a perforated sheet is obtained and at least the perforation and welding steps can be performed continuously in one line, a large number of perforations can be formed on only one side of the film while the cylindrical film is transferred longitudinally to the perforation machine. By making holes along the length of the film at predetermined intervals, the perforation process can be made more efficient, and the time and labor required for manufacturing can be significantly shortened and reduced compared to conventional manufacturing methods. Furthermore, since continuous production is possible, cylindrical products with uniform diameter dimensions can be mass-produced, resulting in significant cost reductions.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a partial plan view of a cylindrical film, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
The figure is a perspective view showing the drilling state, Fig. 4 is a plan view of the drilling tool, Fig. 5 is a sectional view taken along the line B-B in Fig. 4, and Fig. 6 is a cylindrical shape after drilling, welding, and separation. FIG. 7 is a partial perspective view of the film, FIG. 7 is a sectional view taken along the line C-C in FIG. 6, FIG. 10 and 11 are a perspective view and a vertical sectional view of the device in use with the through hole closed, and FIGS. 12 and 13 are a perspective view and a vertical sectional view of the device in use with the through hole open. DESCRIPTION OF SYMBOLS 1... Cylindrical film, 2... Closing, 3... Perforator, 13, 16... Cylindrical film, 14... Welding part,
15... Separation line. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13

Claims (1)

[Scope of Claims] 1. A large number of through holes 12 are formed along the length of the film 1 in the middle part of only one side 13 in the width direction of a flat cylindrical film 1 with both ends open. A linear welded part 14 in which both surfaces 13 and 16 of the film 1 are welded to each other is formed along the length direction of the film 1 on one side in the width direction of the perforated part of the hole 12. On the surface 16 opposite to the surface 13 in which the through holes 12 are formed, the other side of the film 1 in the width direction of the perforated portion of the through hole 12 and the film 1 in the welded portion 14 are formed.
A perforated sheet for a greenhouse, characterized in that tear lines 15, 15 are formed along the length direction of the film 1, respectively, and are located outwardly on one side in the width direction. 2. While transferring the flat cylindrical film 1 with open ends to the punching machine 3 in the length direction, one side 1 of the film 1 is removed.
A large number of through holes 12 are bored at predetermined intervals along the length direction of the film in the width direction middle part of the film 1.
Both surfaces 13 and 16 of the film 1 are welded continuously in a line along the length direction of the film 1 on one side in the width direction outside of the portion where the through hole 12 is formed, and further opposite to the surface 13 where the through hole 12 is formed. The surface 16 of
A method for producing a perforated sheet for a greenhouse, characterized in that the film 1 is cut along the length of the film 1 at the other widthwise outer side of the perforated portion of the through holes 12 and at the widthwise outer side of the welded portion 14.