JP2614894B2 - Container and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a plastic container, a pot for cultivating a plant, particularly a container suitable as a pot for cultivating “lan”, and a method for producing the same.

(Problems to be Solved by the Prior Art and the Invention) Generally, ornamental plants are potted, and pots used are selected from those suitable for the plants.

For example, in the case of “Ran”, it is known that cultivation is difficult, and a bowl for “Ran” is also used for the above-mentioned bowl.

It is said that the bowl for "lan" must have good air permeability, water retention, and fertilization, and that a material having good solar heat absorption is suitable.

As pots for the above-mentioned "ran", pottery of unglazed such as Shigaraki is currently used, but these are very expensive and fragile, so for growers of "ran", the above-mentioned "ran" It is desired that the cultivation conditions of the cultivation can be satisfied and a cheap one can be provided.

Also, at present, general plastic containers are manufactured by injection molding in a mold, so that their surfaces are artificial and unattractive compared to those made of earthenware and the like, and the interior was not satisfactory enough.

The present invention has been made in view of the above situation, and provides a plastic container (pot) having a natural atmosphere suitable for plant cultivation, particularly for cultivation of "lan" or for interior use, and a method for producing the same. The purpose is to:

(Means for Solving the Problems) The plastic container according to the present invention is obtained by mixing natural fibers such as wood flour or rice hull, and calcium carbonate or talc (talc) in a thermoplastic synthetic resin, These are heat-treated and agitated to form a linear form, which is a spirally wound cylindrical body, wherein the winding locus is different for each stage.

Further, the method for producing a plastic container according to the present invention is characterized by including the following steps (a) to (c).

(A) A particulate thermoplastic synthetic resin, a natural fiber such as wood flour or rice hull, and a material mainly composed of calcium carbonate or talc (talc), and a foaming agent, (B). (C) extruding the stream into a linear body from a nozzle of the extruder; The extruded linear body is dropped onto the mounting surface by a predetermined distance, and if necessary, wind pressure is applied from the side to the falling linear body to wind up the cylindrical body on the mounting surface. (Function) In the plastic container configured as described above, since the linear body is foamed by the foaming agent used as an auxiliary agent during manufacturing to form bubbles inside, the air permeability is low. Good, and moisture and fertilizer can be retained in the wood flour or rice hull contained in the linear body together with the air bubbles. further,
As described above, the linear shape is wound up so that the winding locus is different each time (for each stage) and the whole is formed into a cylindrical body. It has an outer shape, giving it a taste that is unlikely to be plastic. Also, in terms of strength, it is made by winding up a linear material mainly composed of plastic,
Very strong and will not break if dropped.

Further, according to the above-described manufacturing method, the temperature, viscosity or inertia force of the linear body extruded from the nozzle instantaneously and instantaneously, and the flow of air acting as an external force are slightly different. The contact angle with the plane is slightly different instantaneously and instantaneously, so that the radius or the plane locus to be wound is different for each winding stage, and the shape is different for each container like a handmade one. Can be manufactured. In addition, by extruding using a nozzle, natural fibers having a large particle size among the natural fibers such as wood flour contained in the linear body gather on the surface of the linear body, that is, the surface of the container, and are exposed to the wood. Unevenness is formed by natural fibers such as powder, and the container has a very tasteful appearance with the same mass feeling as that of a natural product. In addition, the above irregularities make it easier for plants to adhere roots to the container, which is good for cultivation.

In addition, since calcium carbonate or talc is used as one of the main components, when manufacturing, the linear surface coming out of the nozzle falls to the lower mounting surface, but the contact surface between the upper and lower linear bodies The proper temperature required for welding can be maintained (warmed), and the contact surface is easily adhered by the action of calcium carbonate or talc.

(Example) Hereinafter, an example of the present invention will be described.

FIG. 1 is an overall configuration diagram of an apparatus for manufacturing a container according to the present embodiment, and FIGS. 2 (a) to (f) are perspective views showing a state of forming a container in a container manufacturing process.

In the figure, reference numeral 1 denotes a plastic extruder, a hopper 2 for charging a material is attached above the extruder 1, and a press kneader 3 is attached to the extruder on the base end side of the hopper 2.
Is built-in. A screw extruding mechanism 4 is built in the distal end side of the press kneader 3, and a nozzle 5 is attached to a casing on the distal end side of the screw extruding mechanism 4. Further, a guide pipe 6 is formed in a front part below the nozzle 5 so as to be separated from the nozzle 5 and draw a gentle curve in a side surface shape. A mounting table 7 is provided below the guide pipe 6, approximately 1 m below in this embodiment.

In the case of this embodiment, the nozzle diameter is about 4.5 mm.

The following materials are put into the hopper 2. That is, in the present embodiment, polypropylene (thermoplastic material), wood flour (having a particle size of about 70 to 180 mesh), and calcium carbonate in a weight ratio of about 100: 100 to 60:10
The main component is made by blending at a ratio of 0-60.

In addition to the main components, auxiliaries such as pine tar, zinc stearate (stabilizer), butyl stearate (lubricant), and foaming agents (eg, azodicarbonamide (ADC)
A.) or benzenesulfonyl hydrazide (OBS
H.)), the wood flour is weighted with a separation inhibitor (eg, liquid paraffin) for preventing separation from polypropylene, and the weight ratio of the above-mentioned thing to the polypropylene 100 is 10:
3-5: 1: Add at a ratio of about 1-5.

The above-mentioned material (powder) is put into the hopper 2 and the extruder 1
The mixture is heated and kneaded at a temperature of about 150 to 160 ° C to form a fluid. In the case where water is contained in natural fibers such as wood flour, the above-mentioned material is heated and kneaded at 90 to 115 ° C. in advance to form a linear body,
If the intermediate treatment is carried out in the form of pellets (also called chips or compounds), or if this intermediate treatment is omitted, the temperature of the extruder 1 must be 200 ° C. or higher to remove the water. There is.

Then, the fluid is extruded outward from the nozzle 5 at the tip by the screw extruder 4. By passing through the nozzle 5 and going out to the outside and cooling the surface (about 130 to 155 ° C.), the fluid changes into a linear body B, and the linear body B passes through the guide pipe 6, It falls slightly forward and downward.

The linear body B dropped in this way is wound up on the mounting table 7 so that the whole becomes a cylindrical body. This winding,
Generally, one stage is formed by a plurality of windings.

The winding-up involves the viscosity and rigidity of the linear body B that is extruded and dropped, the gravity acting on the linear body B, the inertial force when the linear body B is extruded from the nozzle 5, and the partial contact resistance at the guide pipe 6. Due to the factors such as the reaction force due to the contact angle with the mounting table 7, the winding locus (planar locus) on the mounting table 7 for each winding step, in other words, for each winding. Differently, the whole is rolled up into a tubular body.

Therefore, when it is desired to increase the radius of the cylindrical body, it is possible to increase the drop distance, and to increase the thickness or rigidity of the linear body B (change the material mixture or the material itself). Can increase the radius. Alternatively, a plurality or a single air nozzle (not shown) is provided around the guide pipe 6,
From this, compressed air (in the case of the wire diameter or rigidity of the wire body B of the present embodiment, about 2 kg / cm ² or less) is blown out and laterally dropped onto the wire body falling (passing) through the guide pipe 6. By applying an external force from above, the radius of the cylindrical body can be increased.

The state of the above winding will be described with reference to the drawings. First, as shown in FIG. 2 (a), due to the rigidity of the linear body B and the pushing pressure (falling speed) from behind, the mounting table When the front end contacts the top 7, the rear portion is bent in any direction and lays down on the mounting table 7 (see FIG. 1) in a circle. Then, as shown in FIG.
The subsequent stages are wound up on the linear body of the mounting table so as to draw a similar circle. Thus, as shown in FIGS. 2 (c) to 2 (e), the linear body extruded from the nozzle 5 is sequentially wound up, and the above-described steps are performed for each stage of the wound linear body. Due to such factors, the radius and the planar locus differ, and finally, as shown in FIG. 2 (f), a container (pot) A having a shape like a rolled up ivy can be manufactured.

In the above-mentioned winding process, the temperature of the contact portion between the last step already wound and the linear body B wound thereon is the minimum necessary temperature at which the linear body is welded. For example, the temperature of the material in this embodiment is approximately 80 to 110 ° C. While the calcium carbonate contained in the linear body B acts and reaches the mounting table 7 extruded from the nozzle 5, the minimum temperature required for the welding can be secured. Further, due to the property of the calcium carbonate that is easily adhered, the wound linear members are sufficiently welded.

In the container manufactured as described above, as shown in FIG. 3, many bubbles C are formed inside each rolled linear body B by the action of the organic foaming agent in the material, It also contains hygroscopic wood flour D (or chaff). In particular, among the above-mentioned wood flour, those having a large particle size are:
The projections and depressions are exposed on the surface of the linear body (in other words, the container).

Therefore, if "Ran" is planted therein, the air bubbles (the air bubbles become continuous depending on the mixing ratio of the materials, etc.) provide good air permeability, and moisture and water are contained in the air bubbles and wood flour. It can hold fertilizer and the like. In addition, the unevenness on the surface brings about a feeling of mass and natural feeling to the container, and also has an effect that the roots of the plant are easily attached to the surface of the container in combination with the above-mentioned water retention. Furthermore, if a black dye is added to the above-mentioned material, the color of the container becomes black, the heat absorption becomes high, and a pot more suitable for cultivation of "ran" can be provided.

In addition, since it can be made of inexpensive materials such as thermoplastic synthetic resin (polypropylene), calcium carbonate, and wood powder, it can be provided at a much lower cost than conventional pots.

In addition, the container according to the above example is a general plant pot in addition to the above-mentioned “Ran”, and in addition to a plant pot,
It can be used as a container as an interior, etc.In some cases, if the color of the dye is selected appropriately, it will have the same appearance as a container made of materials such as natural ivy, and an artificial impression unique to plastic Disappears. And since this container is made of plastic, it is hard to break down dramatically compared with the thing of earthenware.

In addition, when a tree with a strong smell is used as wood flour, the smell drifts from the pot, and this point is also very tasteful.

In the case where the above-mentioned “ran” is used as a pot for cultivation or the like, a pointed cylindrical body having a smooth surface is formed on the inner periphery of the container while the temperature of the container itself is deformable. Put in, second
As shown in FIG. (F), the internal step portion may be smoothed to some extent.

Further, in terms of the material, a thermoplastic material such as polyethylene may be used instead of the polypropylene, and a rice hull or other natural fiber material may be used instead of wood flour. In addition, calcium carbonate and talc may be of any type as long as the above-mentioned effects are produced.

(Effect) The container according to the present invention is not inferior to conventional "ran" cultivation pots in terms of air permeability, water retention, and fertilization, and the cost is remarkably lower, and the strength is higher. It is excellent in all aspects, such as being very strong.

Also, since natural fibers such as wood flour are exposed on the surface,
Furthermore, if a suitable color dye is mixed in if necessary, the appearance is no different from a container rolled up using natural ivy, etc., and there is no taste of conventional plastic products, so it can be used as an interior container Can be used without any resistance. Also, by appropriately selecting the type of wood flour to be mixed, a good fragrance of wood can be given around the wood flour.

For this reason, acceptance of a conventional plastic product as a new product can be stimulated. In particular, by mixing a chemical material called plastic with natural substances such as wood flour,
There is a great effect in having the advantages of both.

Further, the method for manufacturing a container according to the present invention has a great significance in that the same product manufactured by hand using natural materials using conventional plastics can be mass-produced using a machine.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an apparatus for manufacturing a container according to the present embodiment, FIGS. 2 (a) to (f) are perspective views showing a state of forming a container in a container manufacturing process, and FIG. It is sectional drawing of the linear body which shows the bubble etc. which exist inside the linear body which comprises a container. 1 ... Plastic extruder, 2 ... Hopper, 3 ...
... Pressure kneader, 4 ... Screw extrusion mechanism, 5 ... Nozzle, 6 ... Guide pipe, 7 ... Placement table, A ... Container,
B: linear body, C: air bubbles, D: wood flour.

Claims (2)

(57) [Claims] 1. A thermoplastic synthetic resin mixed with natural fibers such as wood flour or rice hull, and calcium carbonate or talc, and heat-treated and stirred to form a linear product.
A container, which is a spirally wound cylindrical body, wherein a winding locus is different for each stage. 2. A method for producing a plastic container, comprising the following steps (a) to (c). (A) Kneading a particulate thermoplastic synthetic resin, a natural fiber such as wood flour or rice husk, a material mainly composed of calcium carbonate or talc, and a foaming agent in a heating kneading apparatus. Heating to a stream, (b). (C) extruding the stream into a linear body from a nozzle of the extruder; The extruded linear body is dropped onto the mounting surface by a predetermined distance, and if necessary, wind pressure is applied from the side to the falling linear body to wind up the cylindrical body on the mounting surface.