JPH085109B2 - Foamed resin hose and method for manufacturing the hose - Google Patents

Description

TECHNICAL FIELD The present invention relates to a foamed resin hose that is permeable to liquid and gas and a method for producing the hose, and more specifically, general upland fields (house cultivation, open field cultivation), fruit trees. Agricultural irrigation for gardens, horticulture, etc.
TECHNICAL FIELD The present invention relates to a foamed resin hose that is permeable to liquids and gases, such as water sprinkling, fertilization hoses, and aeration and diffusing tubes used for aquaculture, and a method for manufacturing the hose.

(Prior Art) Conventionally, for example, hoses are used for irrigation watering for planting in agriculture, horticulture, and greening facilities, and these hoses have many small holes formed in the peripheral wall, and exudate from these small holes. Or, it is formed to sprinkle water. These hoses are manufactured by forming a predetermined hose by a known manufacturing method and then forming a small hole as a post-process in the peripheral wall of the hose.

These hoses are used in various ways depending on the application. For example, in an orchard, it is used by hanging it overhead, and in greenhouse cultivation, open-air cultivation, etc., it is used by being placed on the ground or embedded in the ground.

(Problems to be Solved by the Invention) However, the conventional irrigation and sprinkling hoses have the following problems.

That is, although there are soft hose and hard hose depending on the material of these hoses, in the case of a soft hose, the hose can be wound up while being crushed, which is convenient for storage and transportation. However, a kink occurs in the soft hose. That is, since there is no self-shape retention force, twisting,
Kink such as kinking occurs. Further, if the residual liquid dries while being crushed, there is a problem that not only clogging will occur but also the liquid will not swell and swell even if it is passed due to the adhesive action of the residual liquid.

In addition, the soft hose cannot be used in the buried method, and if it is kinked, the flow rate will not be constant.

On the other hand, since the hard hose is not easily deformed, there is no risk of crushing or kinking, and although it can be used in the burying method, storage and transportation are troublesome, and there is a problem that it cannot be easily installed.

Furthermore, since both the soft hose and the hard hose have a large number of small holes continuously formed in the peripheral wall at a constant rate, for example, it is not possible to spray water only on the vegetable stock. could not. In order to form the non-permeable part in the conventional water sprinkling hose, there is only a method of connecting an ordinary hose and the water sprinkling hose with connecting parts, which is time-consuming and expensive.

The present invention has been made in view of the above circumstances, and provides a foamed resin hose having a self-shape-retaining property and further having a permeable portion and a non-permeable portion according to the application, and a method for producing the hose. That is the purpose.

(Means for Solving Problems) Therefore, the present invention has the following configuration in order to achieve the above object. That is, the foamed resin hose according to claim 1 of the present invention is a foamed resin hose formed by mixing rubber powder that has been subdivided by mechanical treatment, and in the foamed resin hose made of closed cells, a crack is provided between the closed cells to allow communication. It is characterized in that a permeable portion in which liquid and gas passages are formed and a non-permeable portion in which independent bubbles are held are alternately provided.

Further, in the foamed resin hose according to claim 2, a permeable portion in which a crack is provided between the closed cells to communicate with each other to form a passage for liquid and gas is provided in a band shape in the axial direction, and the other portion holds the closed cells. It is characterized in that it is a non-permeable portion.

Further, the foamed resin hose according to claim 3 is a permeable hose in which cracks are provided between the closed cells to communicate with each other to form liquid and gas passages, and the transmittance is directed from one end of the hose to the other end. It is characterized by gradually changing.

And the manufacturing method of the foaming resin hose which concerns on Claim 4 WHEREIN: 40-90 parts of rubber powder subdivided by mechanical treatment, 10-40 parts of resin powder, 10-30 parts of olefin resin powder, or ionomer. 0.2 to 2 powder
Part, and further, a mixed powder material is prepared by mixing 0.1 to 1 part of the foaming agent powder, and the mixed powder material is molded into a closed-cell foam rubber hose by an extrusion molding method, which is then faster than the extrusion molding speed. By creating a permeable part in which cracks are formed between the closed cells by drawing at a speed to form a passage for liquid and gas, and by synchronizing the extrusion speed and the drawing speed, a non-permeable part is formed and these are alternated. It is characterized in that the transparent part and the non-permeable part are alternately formed by repeating the above process. Further, in the method for producing a foamed resin hose according to claim 5, the mixed powder material is molded into a foamed rubber hose having closed cells by an extrusion molding method, and then the foamed rubber hose is taken at a speed faster than the extrusion molding speed and immediately after the extruder. It is characterized in that the permeable portion and the non-permeable portion are alternately formed by repeatedly turning on and off the cooling device arranged at.

Further, the method for manufacturing a foamed resin hose according to claim 6,
The mixed powder material is molded into a closed-cell foam rubber hose by an extrusion molding method, and then the foam rubber hose is axially cooled in a belt shape by a cooling device arranged immediately after the extruder, and a speed faster than the extrusion molding speed. It is characterized in that the other part which is not cooled is made into a permeable part and the cooled strip-shaped part is made into a non-permeable part by taking it off with.

Further, the method for manufacturing a foamed resin hose according to claim 7,
A foamed rubber hose with closed cells is molded by an extrusion molding method from the mixed powder material, and is taken at a speed higher than the extrusion molding speed to form a permeable hose in which cracks are provided between the closed cells to communicate with each other to form liquid and gas passages. At the same time, the transmittance is gradually changed from one end of the hose to the other end by gradually changing the take-up speed.

(Effect of the Invention) In claim 1 of the present invention, the vulcanized rubber utilizes the incompatibility that it does not melt with the resin. And, it is possible to maintain a constant strength. More specifically, the rubber powder acts not only as a bulking material but also as a material having a certain strength and self-sustaining property, and is effective for adjusting the transmittance. Further, it is possible to ventilate and pass water at regular intervals. Further, according to the second aspect, ventilation and water passage are possible only on one side in the axial direction. In addition, according to the third aspect, uniform ventilation and water flow are possible in the entire hose.

Further, according to the fourth aspect, the transmissive portions and the non-transmissive portions can be alternately formed, and the interval can be set arbitrarily. Further, according to claim 5, even if the take-up speed is constant, the permeable part and the non-permeable part can be alternately formed by turning the cooling device on and off.
By changing the off spacing, the spacing between the transmissive and non-transmissive portions is also changed. According to the sixth aspect, the widths of the permeable portion and the non-permeable portion can be changed by changing the width of the cooling strip. According to claim 7,
By gradually changing the transmittance from one end to the other end of the hose, it is possible to obtain a hose that can obtain uniform ventilation and water flow in the entire hose.

(Example) FIG. 1 is a partially enlarged sectional view of a foamed resin hose according to the present invention, showing a liquid and gas permeable portion.

In the figure, 1 is a vulcanized rubber powder, 3 is a foamed resin layer, 5 is a bubble, and 7 is a crack. The vulcanized rubber powder 1 is wrapped in the foamed resin layer 3 and firmly bonded. Part of the crack 7 formed between the bubbles 5 is continuous and allows the bubbles 5 to communicate with each other. Therefore, the passage formed by the cracks 7 makes the independent bubbles continuous and allows the liquid and gas to permeate from one side surface to the other side surface. It is possible.

If the ratio of the cracks 7 is increased, the transmittance becomes higher. That is, the amount of water sprayed can be adjusted by changing the ratio of the cracks 7.

Since the vulcanized rubber powder is mixed in the foamed resin hose according to the present invention, it is possible to maintain a predetermined shape and strength while being a foamed body.

FIG. 2 shows a modified example of a foamed resin hose having a liquid and gas permeable portion and a non-permeable portion.

FIG. 2A shows the case where the transparent portions 20 and the non-transparent portions 21 are alternately formed at predetermined intervals. The interval of the transparent part 20 is
For example, if it is formed according to the interval between the vegetable stocks, water can be efficiently sprayed only on the vegetable stock parts, and water can be saved. FIG. 2 (B) shows a case where the permeable portion and the non-permeable portion are formed in a band shape in the axial direction. That is,
This is a case where the upper half is the transparent portion 20a and the lower half is the non-permeable portion 21b in the axial direction. Such a hose having a half-permeable cross section is effective when used as a mounting method or an embedding method. FIG. 2C shows the case where the transmittance is gradually changed from one end of the hose to the other end. When the transmittance is gradually changed toward one end in this way, uniform water sprinkling is possible at both ends.
That is, normally, if the both ends have a uniform transmittance, the water pressure is lowered at the tip end, and naturally the amount of water spray is also reduced. However, when increasing the transmittance toward the tip,
It is possible to compensate for the decrease in water pressure and ensure a uniform water spray rate.

Next, a method for manufacturing the foamed resin hose will be described.

First, the composition of the material is as follows. That is, 40 to 90 parts of rubber powder finely divided by mechanical treatment, 10 to 40 parts of resin powder, and 10 to 30 parts of olefin resin powder.
Parts, or 0.2 to 2 parts of ionomer powder, and 0.1 to 1 part of a foaming agent powder are mixed to form a mixed powder material.

The rubber powder is a granular or powder rubber obtained by mechanical treatment of vulcanized rubber such as crushing, cutting and polishing, and may be natural rubber, synthetic rubber or a blend thereof. The size of the powder is appropriately determined depending on the size of the hose, the wall thickness, etc., but it is preferably 20 to 80 mesh. The mesh may be increased to increase the transmittance, and conversely, the mesh may be decreased to decrease the transmittance. The mixing amount is 40 to 90 parts.

Next, resin powder is PP, PE, nylon, or
It is preferable to use a vinyl resin (for example, ethylene vinyl acetate copolymer (EVA)). This resin powder is used to impart flexibility (elasticity), low temperature characteristics and weather resistance to the product. Powder size is 10 ~
Make 80 mesh and mix at a ratio of 10 to 40 parts. Usually, the resin is used in the form of pellets for easy handling, but in the present invention, the resin is not used in the form of pellets, but is used in the form of powder in order to improve the dispersion with rubber powder.

In this invention, the incompatibility between the rubber powder and the resin powder is utilized, and as is conventionally done, the rubber powder is simply added to impart elasticity or a bulking agent. Absent.

That is, the incompatibility of the rubber powder and the resin powder of the vulcanized rubber is based on the property that the vulcanized rubber and the resin do not melt and the resin holds the rubber in a wrapped state. By foaming the resin layer, it is possible to maintain a predetermined shape and strength by mixing vulcanized rubber, even though it is a foam body in which cells partitioned by a thin film are continuous.

The olefin resin powder and the ionomer powder are used as a structural adhesive for the rubber powder and the resin powder. When the resin powder is PP, PE or nylon, 0.2 to 2 parts of ionomer powder of 10 to 50 mesh and vinyl resin (for example,
In the case of ethylene vinyl acetate copolymer (EVA)), 20 to 80 mesh olefin resin powder
Preference is given to using 30 parts. This olefin resin powder is a special polyolefin that has a property of strongly adhering to various organic and inorganic materials by thermal reaction by introducing a special functional group into non-polar PE, that is, a polyolefin with a polar portion added. Preferably there is.

 The blowing agent powder is 0.1 to 1 part.

The compounded powder material having the above structure may be compounded by a known method, that is, a tumbler or a super mixer.

 Next, a manufacturing method will be described.

The present invention is characterized in that it is molded by an extrusion molding method, the take-up speed is made faster than the extrusion speed, and cracks are generated between the bubbles to make them communicate with each other. FIG. 3 is a schematic side view for explanation showing each step of the present invention.

First, in the same manner as in conventional extrusion molding, the compounding material is extrusion foam-molded by the extruder 10. The extrusion foam molding may be carried out by a known method, and the extrusion speed, the cylinder temperature of the extruder and the like are adjusted depending on the thickness of the product, the compounding ratio, the particle size of the rubber powder and the like.

The extruded product is taken by the take-up device 13. The take-up speed by the take-up device 13 is taken at a speed higher than the extrusion speed. In the present invention, when the bubbles are generated at a speed higher than the extrusion speed to cause cracks between the independently foamed cells, a communication passage is formed so as to sew between the rubber powders. This passage allows liquid and gas to pass through. Therefore, the transmittance (aperture ratio) can be adjusted by the take-up speed. That is, when the extrusion speed and the take-up speed are the same, the transmittance becomes zero, and the transmittance becomes higher as the take-up speed becomes faster. The extrusion speed is
Although it depends on the shape of the extruder and the product, the extrusion speed is generally 1.1 to 1.7 m / min and the take-up speed is 1.2 to 2.0 m / min. Therefore, the take-up speed should be 3 to 30% higher than the extrusion speed. Is preferred.

In this way, after extrusion molding, air bubbles are made to communicate with each other by drawing at a speed higher than the extrusion speed to form a passage, but in order to facilitate winding, a cooling device is used.
11 is preferably arranged. The cooling device 11 is the take-up device 13
The molded article to which the permeability is imparted is solidified, and the cooling means may be air, cold water, or the like.

If cooled immediately after extrusion, it is not possible to impart permeability to the product, so it is necessary to maintain a sufficient distance with the extruder 10, and the cooling device 11 is preferably installed at a distance of 1 m or more. . In addition, the cooling device 11 and the transaction device 13
It is possible to manufacture a product having a permeable portion and an impermeable portion in combination with.

For example, as shown in FIG. 2 (a), in order to alternately form the permeable portion and the non-permeable portion, take-up is performed at a speed higher than the extrusion molding speed, or the extrusion molding speed and the take-up speed are synchronized, and Should be repeated alternately. The cooling device is provided at a position where it will operate after the permeable portion is formed. As another method, it can be formed by taking out at a speed higher than the extrusion molding speed, disposing a cooling device immediately after the extruder, and repeating turning on and off the cooling device. Since the hose is solidified by cooling with the cooling device, cracks do not occur between the independent bubbles even when pulled, and the hose can be made into a non-permeable portion. The hose in which the permeable part and the non-permeable part are alternately formed is effective for efficiently irrigating only the plant such as vegetables.

Further, as shown in FIG. 2 (b), in order to form the permeable portion and the non-permeable portion in a band shape in the axial direction of the hose, the foamed rubber hose is axially moved by a cooling device arranged immediately after the extruder. It can be molded by cooling it in a strip shape and taking it off at a speed higher than the extrusion molding speed. Since the cooled strip-shaped portion is solidified, it stretches slightly when pulled, but does not reach the crack between the closed cells.
On the other hand, when the uncooled strip-shaped portion is pulled, a crack is generated between the closed cells to form a permeable portion. In this way, for example, when only the lower part of the product in the axial direction is cooled, the permeable part and the non-permeable part can be formed in the vertical direction of the cross section. Is effective as.

Further, as shown in FIG. 2C, in order to manufacture a hose having different transmittances at both ends, the take-up speed of the take-up device 13 may be gradually changed. By gradually increasing the take-up speed, it is possible to obtain a hose whose transmittance is gradually increased. As described above, by gradually increasing or decreasing the take-up speed instead of the constant value, it is possible to obtain products having different transmittances at both ends. If the transmittance is increased as it goes to the tip, the amount of water sprayed does not change even at the tip, and uniform water spray can be obtained.

Finally, the product taken up by the take-up device 13 is taken up by the take-up device 15.

(Effects of the Invention) As is clear from the above description, the present invention has the following effects.

That is, the foamed resin hose according to claim 1 has a self-shape-retaining property, and the permeable portion and the non-permeable portion can be formed in arbitrary shapes according to the application, so that efficient ventilation and communication can be achieved. Water can be done. Further, in the foamed resin hose according to the second aspect, since the permeable portion and the non-permeable portion are formed in a band shape, the hose most suitable for the mounting method and the burying method can be obtained. Further, in the foamed resin hose according to the third aspect, since the transmittance is gradually changed from one end of the hose to the other end, uniform ventilation and water passage can be obtained in the entire hose.

The method for producing a foamed resin hose according to claim 4 is a very simple method of operating a take-off device, which does not require post-processing, and is a lightweight flexible foamed resin hose having air permeability and water permeability in one step. Obtainable. Further, the permeable portion and the non-permeable portion can be alternately formed by making the take-up speed faster or synchronized with the extrusion molding speed. Further, in the method for producing a foamed resin hose according to claim 5, the method of taking out at a speed higher than the extrusion molding speed,
By combining the turning on and off of the cooling device arranged immediately after the extruder, it is possible to manufacture a hose having a permeable part and an impermeable part.

Further, the method for manufacturing a foamed resin hose according to claim 6,
While the foamed rubber hose is cooled in a belt shape in the axial direction by a cooling device arranged immediately after the extruder, the permeable portion and the non-permeable portion can be formed in a belt shape by taking it off at a speed higher than the extrusion molding speed. it can. In addition, claim 7
In the method for producing a foamed resin hose according to the above method, a foamed resin hose is obtained in which the transmittance is gradually changed from one end of the hose to the other end by gradually changing the take-up speed.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a foamed resin hose according to the present invention,
FIG. 2 is a side view showing a modified example of a foamed resin hose in which a liquid and gas permeable part and a non-permeable part are formed, and FIG. 3 is a schematic side view for explaining a manufacturing process. 1 is a vulcanized rubber powder, 3 is a resin foam layer, 5 is air bubbles, 7
Is a crack, 10 is an extruder, 11 is a cooling device, 13 is a take-off device, 15
Is a winding device, 20 is a transparent part, 21 is a non-permeable part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B29K 105: 04 B29L 23:18 C08L 21:00 (56) Reference JP-A-1-240537 (JP , A) JP-A-58-81133 (JP, A)

Claims (7)

[Claims] 1. A foamed resin hose made of closed cells, which is made by mixing rubber powder finely divided by mechanical treatment, and has a crack formed between the closed cells to communicate with each other to form liquid and gas passages. A foamed resin hose characterized in that a portion and a non-permeable portion holding closed cells are alternately provided. 2. A foamed resin hose formed by mixing rubber powder which has been finely divided by mechanical treatment and having closed cells, wherein cracks are provided between the closed cells to communicate with each other to form liquid and gas passages. The part is provided in a band shape in the axial direction,
A foamed resin hose characterized in that the other part is a non-permeable part holding closed cells. 3. A foamed resin hose formed by mixing rubber powder which has been finely divided by mechanical treatment, and having closed cells, in which a crack is provided between the closed cells to make them communicate with each other to form liquid and gas passages. A foamed resin hose, which is a hose and whose transmittance is gradually changed from one end of the hose to the other end. 4. A rubber powder subdivided by mechanical treatment.
40-90 parts, resin powder 10-40 parts, olefin resin powder 10-30 parts, or ionomer powder
0.2 to 2 parts, and 0.1 to 1 part of the foaming agent powder were mixed to prepare a mixed powder material, and the mixed powder material was molded into a closed-cell foam rubber hose by an extrusion molding method. By forming a permeable part in which cracks are formed between the closed cells to form liquid and gas passages by drawing at a higher speed, a non-permeable part is formed by synchronizing the extrusion speed and the drawing speed, A method for producing a foamed resin hose, characterized in that a permeable portion and a non-permeable portion are alternately formed by repeating these alternately. 5. Rubber powder finely divided by mechanical treatment
40-90 parts, resin powder 10-40 parts, olefin resin powder 10-30 parts, or ionomer powder
0.2 to 2 parts, and 0.1 to 1 part of the foaming agent powder were mixed to prepare a mixed powder material, and the mixed powder material was molded into a closed-cell foam rubber hose by an extrusion molding method. At a faster rate than
A method for producing a foamed resin hose, characterized in that a permeable part and a non-permeable part are alternately formed by repeatedly turning on and off a cooling device arranged immediately after the extruder. 6. A rubber powder subdivided by mechanical treatment.
40-90 parts, resin powder 10-40 parts, olefin resin powder 10-30 parts, or ionomer powder
0.2 to 2 parts, and 0.1 to 1 part of the foaming agent powder were mixed to prepare a mixed powder material, and the mixed powder material was molded into a foamed rubber hose with closed cells by an extrusion molding method. While cooling the foamed rubber hose axially in a strip shape by a cooling device arranged immediately after that, by taking it off at a speed faster than the extrusion molding speed, a crack is provided between the closed cells of the other part which is not cooled to form liquid and gas. A method for producing a foamed resin hose, characterized in that a permeable part having a passage is formed, and the cooled strip-shaped part is made a non-permeable part. 7. Rubber powder finely divided by mechanical treatment
40-90 parts, resin powder 10-40 parts, olefin resin powder 10-30 parts, or ionomer powder
0.2 to 2 parts, and further mixed with a foaming agent powder in a ratio of 0.1 to 1 part to prepare a mixed powder material, and the mixed powder material is molded into a closed-cell foam rubber hose by an extrusion molding method. A permeable hose with a crack formed between the independent bubbles to communicate with each other to form a passage for liquid and gas is formed at a high speed to form a passage for liquid and gas, and the permeability is gradually changed by gradually changing the withdrawing speed from one end to the other end of the hose. A method for producing a foamed resin hose, characterized by gradually changing toward