JP4093290B2 - Method for producing pot made of synthetic resin having slit on side surface - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for efficiently producing a pot made of synthetic resin having a slit on a side surface, which is suitable for cultivating plants such as vegetables, flower buds and seedlings by hydroponics.
[0002]
[Prior art]
In the hydroponic method, for example, pebbles are placed in a sieve to support the plant body, and the roots are extended into the culture solution through the sieve eyes. There is also a pouring method. In particular, the hydroponics pot has been devised to extend the roots in the culture medium as much as possible. One of the synthetic resin pots suitable for hydroponics has a slit on the side (peripheral wall). The pot which has is mentioned. The typical manufacturing method includes an injection molding method and a vacuum molding method using a synthetic resin, but each has advantages and disadvantages.
That is, (1) in the production of a pot for cultivation by injection molding, a slit portion is formed in a mold and a molten resin is injected therein, so that a pot with a slit can be manufactured relatively easily. However, compared to the vacuum forming method described below, (a) the mold cost is high (when the number of the same is taken, it is about 10 times that of vacuum forming), (b) the pot thickness cannot be reduced, (c) molding It is disadvantageous in terms of cost due to slow speed.
[0003]
On the other hand, in the (2) vacuum forming method, a roll in which a sheet formed by extruding a synthetic resin is wound is used. The flow configuration of the vacuum forming process is as follows:
(A) Sheet roll feeding mechanism
(A) Sheet heating zone
(C) Vacuum forming zone in mold
(D) It can be divided into press zones that separate the molded containers individually.
[0004]
If processing such as placing a round hole or perforation in the bottom of the molded pot is necessary, there is an intermediate between the vacuum forming zone in the mold (c) and the press zone from which the container is separated. It can be processed continuously by placing a press. Such intermediate press work is limited to the bottom part (horizontal part) of the pot due to vertical movement in the vertical direction from the mechanism of the machine, and it does not depend on secondary work when slitting the side part (peripheral wall part). Therefore, a decline in production efficiency cannot be avoided.
[0005]
[Problems to be solved by the invention]
The object of the present invention is to make the slit processing process of the pot side face part independent of the secondary processing, and to perform integrated production in the flow of the vacuum forming process using an intermediate press machine, thereby enabling the production process to be shortened. Another object of the present invention is to provide a method for producing a pot made of synthetic resin having a slit on a side surface.
[0006]
[Means for Solving the Problems]
As a result of intensive investigations for the purpose of efficiently slitting the pot side surface in the vertical operation of the intermediate press, the present inventor has determined that the operation of the intermediate press machine is a vertical movement in the structure. Can not be slit, but by bending the bottom of the side surface in a bowl shape or adding a gradient to the lower side of the side surface, and attaching a punch for small holes to the number of slits in the intermediate press machine, It has been found that even when the punching blade is vertical, it can be slotted, that is, slitted by cutting the curved portion at the bottom of the side of the pot or the inclined portion at the bottom of the side. The present invention has been made based on this finding.
[0007]
That is, according to the present invention, in the method for producing a synthetic resin pot having a slit on the side surface, (1) the bottom of the side surface is bent into a bowl shape by a vacuum forming method using a mold, or the lower side portion of the side surface is horizontal. A step of molding a synthetic resin pot tilted at a gradient of 30 to 60 ° with respect to the curved surface of the side bottom of the molded synthetic resin pot or the inclined surface of the lower side of the side, The slitting process is performed on the bottom of the side surface or the lower side of the inclined side surface that is bent by the two vertically facing cutting blades, and (3) the synthetic resin pot slitted on the side surface is used as a press. A method of manufacturing a pot made of a synthetic resin having a slit on a side surface.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0009]
FIG. 1 shows a flow structure of a series of vacuum forming processes incorporating an intermediate press process for slitting. In FIG. 1, a plate-shaped plastic sheet 2 fed from a roll 1 around which a plastic sheet is wound is softened by a heater 3. While heating up to the point, it is fed into the inside of the mold 4 corresponding to the shape of the slit unprocessed pot, and in the mold, the space between the sheet 2 is evacuated and the sheet 2 is stretched to the shape of the mold, and after cooling Remove the vacuum and remove the molded pot. Subsequently, by the intermediate press device 5 that performs slit processing provided in the feed direction, a slit extending downward at a predetermined interval is formed on the curved surface of the bottom surface of the pot side surface or the inclined surface of the lower portion of the pot side surface to form a slit. The pots are sequentially fed into the die-cutting press device 6 and separated individually.
[0010]
FIG. 2 exemplifies a configuration diagram of the intermediate press device 5 that performs slit processing, and the cutting blade that processes the slit faces the inclined surface by the number corresponding to the number of slits to be formed on the inclined surface at the lower portion of the pot side surface. The die (lower blade) 7 is fixed by supporting the inclined surface at the lower part of the pot side face with the bottom part of the pot covered at a fixed interval. The punch (upper blade) 8 is mounted on the punch holder 9 so as to face the die (lower blade) 7 and can be moved vertically up and down. The surface 11 is cut into a slit shape.
[0011]
The cross section of the lower part of the pot side surface to be slitted is circular, and attempts to form a total of eight slits at a certain interval on the inclined surface of the lower part near the pot height 1/2 to 1/3. In this case, eight upper blades and eight lower blades facing each other are prepared on the same circumference so as to face the inclined surface. In this way, the pot side lower part is 60 ° with respect to the horizontal direction. FIG. 3 is a perspective view of a pot having slits on the inclined surface, and FIG. 4 and FIG. 5 are plan views and side views, respectively.
[0012]
When the side surface of the pot is cut vertically with a small hole cutting blade (cutting blade), the side surface cannot be cut vertically, but the slit length can be increased by making it as steep as possible.
[0013]
2 and 3, the shape of the lower portion of the side surface is described as a conical shape having an inclined surface. However, as shown in FIG. 6, the bottom surface of the pot side surface may be a bowl-shaped bowl-shaped curved surface. Needless to say. The bottom of the side surface of the synthetic resin pot is bent in a bowl shape, or the side surface of the synthetic resin pot is inclined at a gradient of 30 to 60 ° with respect to the horizontal at 1/2 to 1/3 lower part of the height. The shape of the upper part of the pot may be a square tube other than the cylinder.
[0014]
A thermoplastic resin such as polyethylene, polypropylene, polystyrene, and polyvinyl chloride is preferably used as the material of the pot. In the case of polystyrene, if a steep slope is cut, damage may occur. Therefore, in practice, the slope of the lower side portion is practically in the range of 45 ° to 60 ° with respect to the horizontal.
[0015]
In order to reliably perform the slit processing, the small hole punching blade (cutting blade) is composed of an upper blade and a lower blade facing each other as shown in FIG.
[0016]
The slit width is arbitrarily determined by the size of the diameter of the punching hole for small holes, but in the case of a pot for hydroponics, it is at least 3 mm wide so that it can pass so as to play the role of extending the root of the plant outside the pot. Usually, it may be in the range of 3 to 5 mm width.
[0017]
【The invention's effect】
As described above, according to the present invention, the side slit processing is performed without being subjected to secondary processing and is incorporated in the flow of the vacuum forming process, so that the hydroponics pot having the side slit structure is provided. It can be manufactured efficiently.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a manufacturing process of an embodiment according to the present invention. FIG. 2 is a block diagram of a press apparatus for slitting an inclined surface at a lower part of a side surface of a pot. Perspective view of a pot with slits [Fig. 4] Plan view of a pot with slits [Fig. 5] Side view of a pot with slits [Fig. 6] Perspective view of pot [Explanation of sign]
DESCRIPTION OF SYMBOLS 1 Sheet roll 2 Plastic sheet 3 Heater 4 Mold 5 Intermediate press apparatus for slit processing 6 Press apparatus 7 for die-cutting Die (lower blade)
8 Punch (upper blade)
9 Punch holder 10 Stopper 11 Inclined surface of pot side lower part

Claims (3)

In the method for producing a synthetic resin pot having a slit on the side surface, (1) the side surface bottom is bent into a bowl shape by a vacuum forming method using a mold, or the side lower part is 30 to A step of molding a synthetic resin pot inclined at a 60 ° gradient; (2) a vertically installed surface facing the curved surface at the bottom of the side surface or the inclined surface at the lower side of the side of the molded synthetic resin pot; A process of slitting the bottom of the side surface bent by the two cutting blades facing each other or the lower side of the inclined side surface, and (3) individually punching the synthetic resin pot slitted on the side surface with a press machine Of manufacturing a synthetic resin pot having a slit on a side surface, characterized by comprising the steps of: A lower blade that is installed at an interval corresponding to the number of slits to be formed in the side surface of a bent or inclined synthetic resin pot, and the upper blade moves vertically up and down and is fixed facing it The method for producing a synthetic resin pot having a slit according to claim 1, wherein slit processing is performed on a side surface that is bent or inclined by a cutting blade constituted by: The synthetic resin pot having a slit according to claim 1 or 2, wherein the side surface is a synthetic resin pot inclined at a gradient of 30 to 60 ° with respect to the horizontal at a lower portion of 1/2 to 1/3 of the height. Production method

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