JP3493761B2 - Molding method of seedling raising device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of molding a seedling incubator made of synthetic resin for growing seedlings such as rice and vegetables in a pot in a unit of one plant. 2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. 55-100 discloses a seedling incubator using a synthetic resin as a material, in which a plurality of pots are connected at the opening side, the bottom side is independent and a hole is formed at the bottom. , Are disclosed. This conventional seedling incubator has been formed by injection molding using a mold having the above-mentioned form, that is, a form having a hole at the bottom of the pot. [0003] In the conventional molding method,
Since injection molding is performed using a mold that molds a seedling incubator into a form in which a hole is formed at the bottom of the pot, the flow of the material at the bottom of the pot is poor, so that the material is insufficiently filled and the hole shape collapses. It sometimes spread or the thickness of the bottom became thin. In order to avoid this molding failure, the injection pressure of the material is increased. However, if the injection pressure is too high, casting will occur. As described above, according to the conventional molding method by injection molding, molding defects and casting tend to occur easily, so that a molded product in a homogeneous state cannot be efficiently produced, resulting in an increase in product cost. [0004] Accordingly, in view of the above background, it is an object of the present invention to provide a seedling incubator which is less likely to cause molding defects and cast-up, efficiently produces a molded article in a homogeneous state, and reduces the cost of the product. Is the problem to be solved. [0005] In order to solve the above-mentioned problems, the present invention is directed to an upper opening from a circular bottom 2b.
The body 2c toward 2a is cylindrical and gradually widens in diameter.
A large number of pots 2...
Is thinner than that of the lower part of the body 2c.
The bottom 2b is provided with a trifurcated slot 2d, and the openings 2a are formed .
Numerous ports in longitudinal and lateral sides is coupled to the bottom 2b ... side are independently
Are arranged, and the pot interval at the center in the short direction is wide
Are arranged so as to form a wide central portion 2e.
In the method for forming a flexible seedling incubator made of the synthetic resin as a material, a slot
d. With male A and female B to mold a seedling incubator without
Injection molded using a configured die, gold injection material
Cools and cures in the mold, then separates male A and female B
To open the mold and adsorb to the molded product P that is in close contact with one of the molds
The suction tool V is sucked and adsorbed to form a molded product P from the mold.
And a slot 2d is formed in the bottom 2b of the pot 2.
Was forming method of seedling device, characterized in that punching with a punching-type C. [0006] As described above , the circular bottom 2b
... to the upper opening 2a ... in a cylindrical shape.
And a large number of pots 2 with gradually increasing diameter
, And the thickness of the bottom portions 2b...
The bottom 2b is provided with a trifurcated slot 2d.
, The openings 2a ... side are connected and the bottom 2b ... side is independent
A large number of pots 2 are arranged in the left, right, front and back, and the center in the short direction
Are arranged so that the pot spacing of
Flexibility made of synthetic resin with central wide portion 2e formed
In the method of molding a seedling incubator having
Mold a seedling incubator with no slot 2d in the bottom 2b
Injection molding using a mold composed of a male mold A and a female mold B
The injected material is cooled and cured in the mold,
The mold A and the female mold B are separated from each other, and the mold is opened.
The suction-type take-out tool V is sucked and sucked to the molded product P
To remove the molded product P from the mold, and the bottom of the pot 2 ...
2b ... are punched with a punching die C.
Since the method for forming a seedling incubator is characterized in that the seedling incubator has no trough- shaped slot 2d in the bottom 2b of the pot 2, it is injection-molded. The flow of the material to the bottom 2b of the pot 2 is better than that of injection molding using a mold for molding a seedling incubator having a trifurcated slot 2d at the bottom 2b of the pot 2. Therefore, the molded product P is uniform, and molding defects are reduced, and high-efficiency and high-quality molding can be performed. In addition, the injection pressure can be set low, and the molding machine can be reduced in size, which is economical. In addition, male
When the molded product P that is in close contact with one of the molds is removed after separating the female mold A from the female mold B , a slot 2d is formed in the bottom 2b of the pot 2.
Are not open , the molded product P can be sucked and sucked by the suction type take-out tool V and peeled off from the mold, so that work efficiency can be improved and cost can be reduced. In addition, punching
Sometimes the bottom 2b of the pot 2 is molded to a predetermined thickness
Then, the slots 2d of the bottom portions 2b of the pots 2 can be punched after injection molding . An embodiment of the present invention will be described in detail with reference to the drawings. First, the form of the seedling raising device 1 will be described (FIG. 1).
3). The seedling raising device 1 has a plurality of pots 2 on the left, right, front and back.
Are arranged, and the openings 2a of the respective pots 2 are connected,
The bottom 2b ... side is formed in an independent form. The outer peripheral shape of the seedling raising device 1 is rectangular in plan view. Each pot 2 of the seedling raising device 1 has a cup shape, that is, an opening 2 above a circular bottom 2b.
The shape is provided in a cylindrical shape toward a. Further, trough-shaped slots 2d are provided in the bottom portions 2b of the pots 2. The thickness of the bottom 2b is smaller than the thickness of the lower portion 2c. When the longitudinal direction is the front-rear direction and the short direction is the left-right direction, the pot interval at the left and right central portions of the seedling raising device 1 is wide to form a central wide portion 2e, and the central wide portions 2e form the pots 2. It is a form that is divided into seven right and left parts. Further, square holes 2g... 2g... 2g for transferring the seedling raising devices are provided at the left and right edge portions of the seedling raising device 1, that is, the longitudinal side edge portions 2f. Have been. When a seedling using this seedling raising device 1 is loaded into a transplanting machine to perform a transplanting operation, the seedling feeder provided in the transplanting device engages with the square holes 2g for transferring the seedling raising device. The pots 2 are transported one by one in the longitudinal direction. Next, a seedling raising method using the seedling raising device 1 will be described (see FIGS. 5 and 6). First, each pot 2 is filled with floor soil 3, then seeds 4 are sown in 3 to 4 grains, and the cover soil 5 is packed. The seedling boxes that have been seeded in this way are stacked in a germinator and put into emergence. The seedling boxes that have emerged are laid with cold gauze on the seedlings that have been appropriately crushed, leveled, and irrigated, and are arranged while being pressed tightly on top of them. After arranging, water is sprinkled with water from above the seedling box with a fine Joro. After the watering, cover the seedling box with vinyl sheet and keep it warm. Then, the seedlings are raised while performing timely watering. The roots coming out of the seeds 4 extend downward, and further extend through the slots 2d provided in the bottom 2b of the pot 2 to the ground, absorbing nutrients and moisture from the seedlings. And leaf age 4-5.5 leaves, plant height 15
When the seedlings are grown up to ２０20 cm, they are transplanted to paddy fields. At the time of transplanting, a seedling pushing rod is pushed into the pot 2 from the bottom 2b provided with the slot 2d of each pot 2 of the seedling raising device 1, and the seedling is taken out from the pot 2 and transplanted to the field. Now, a method of forming the seedling raising device 1 will be described (see FIG. 4). The seedling raising device 1 is integrally formed of a synthetic resin material made of a thermoplastic material such as polypropylene. The molded seedling raising device 1 has an appropriate flexibility. As a specific molding method, first, the molten synthetic resin material M is injected into a mold composed of the male mold A and the female mold B at a predetermined injection pressure. The mold used here is
A mold for molding a seedling incubator having no slot 2d in the bottom 2b of the pot 2 is provided. The injected material is cooled and hardened in the mold. Thereafter, the male mold and the female mold are separated from each other, and the mold is opened. The molded product P in close contact with one of the molds is sucked and sucked by the suction-type take-out tool V to peel the molded product P from the mold. Next, the molded product P thus injection-molded is punched (press-punched) by a punching die C in a slot 2d of the bottom 2b of the pot 2. In this way, a seedling raising device having a slot 2d at the bottom 2b of the pot 2 is formed. The method of forming the seedling raising device 1 as described above has the following effects. That is, in the injection molding in this molding method, injection molding is performed using a mold for molding a seedling incubator having no slot 2d in the bottom 2b of the pot 2.
In comparison with injection molding using a mold for molding a seedling incubator having a slot 2d at the bottom 2b of the pot 2,
Since the flow of the material to the bottom portions 2b of the... Is good, the molded product P is uniform, the molding defects are reduced, and the molding with high efficiency and high quality can be performed. Also, the injection pressure can be set low,
The molding machine can be reduced in size and economical. Further, when the molded product closely contacting one of the molds is removed after the male mold and the female mold are separated from each other, since no hole is formed in the bottom portion 2b of the pot 2, the molded product P is sucked and adsorbed to absorb the metal. It can be peeled off from the mold, improving work efficiency and reducing costs.
Since the slots 2d of the bottoms 2b of the pots 2 are punched after injection molding, the shape of the holes can be easily changed. Further, the bottom portions 2b of the pots 2 can be formed into a predetermined thickness at the time of punching.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a seedling incubator. 2A is a side view of a seedling raising device, and FIG. 2B is a front view of the seedling raising device. FIG. 3 is a partially enlarged plan view of the seedling raising device. FIG. 4 is a process flow chart showing a method for molding a seedling raising device. FIG. 5 is a cross-sectional side view showing a part of a seedling incubator in a sowed state. FIG. 6 is a side view showing a part of a state in which seedlings are raised in a seedling raising device. [Explanation of Signs] 1: Seedling raising device 2: Pot 2a: Opening 2b: Bottom 2c : Trunk 2d: Slot 2e: Wide central portion A: Male type B: Female type P: Molded product V: Extraction tool C: Stamping die

Claims (1)

(57) Claims 1. Opening 2a above circular bottom 2b ...
The body 2c toward ... has a cylindrical shape and the diameter gradually increases.
A large number of pots 2...
The thickness of the body 2c is made smaller than that of the lower part,
2b are provided with a trifurcated slot 2d, the openings 2a are connected to each other, and the bottom 2b side is independent of a large number of left, right, front and rear sides.
2 ... arranged, the pot interval at the center in the short side direction is widened
In the method of forming a flexible seedling incubator made of a synthetic resin having the central wide portion 2e formed by arranging the pots 2 as described above, a slot 2d is formed in the bottom 2b of the pot 2 ... …
Consists of a male mold A and a female mold B for molding seedlings without any form
Is the injection molded using a mold, the injected material in the mold
To cool and harden, then pull male A and female B apart
Open the mold, and hold the molded product P in close contact with one mold
The removal tool V is sucked and sucked to pull the molded product P from the mold.
Peel off and hit a slot 2d on the bottom 2b of the pot 2.
A method for forming a seedling raising device , comprising punching with a punching die C.