JPH0872075A - Production of chip urethane - Google Patents

Abstract

PURPOSE: To shorten a molding time and a drying time by mixing a urethane binder with a chip material obtained by grinding a urethane waste material to charge the resulting mixture in a press mold and supplying steam to the mixture in an amt. necessary for the reaction of the binder while supplying hot air thereto in the quantity of heat necessary for the curing of the binder. CONSTITUTION: A urethane waste material is ground by a grinder to form a chip material which is, in turn, mixed with a urethane binder in a mixer and the resulting mixture is charged in the lower mold 22 of a press mold 21 and molded into a desired shape by the freely liftable upper mold 23 of the press mold 21. A small chamber 27 is formed under the bottom wall 26 of the lower mold 22 and a steam generator 28 and a hot air generator 29 are connected to the small chamber 27 to supply steam and hot air into the lower mold 22 from a large number of the small holes 26a of the bottom wall 26. Hot air and steam are supplied while changed over by a changeover valve 33. The binder of the mixture is reacted by the supply of steam and the binder is cured by hot air to form a molding. By this constitution, a molding time and a drying time can be shortened and working efficiency can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing chip urethane. More specifically, waste material such as urethane is crushed by a crusher to form a chip material, and a urethane binder is mixed with the chip material by a mixer. The present invention relates to a method for producing chip urethane formed by mixing and molding the mixture with a press mold.

[0002]

2. Description of the Related Art Conventionally, chip urethane has been used as a cushion material or an interior material for vehicles. This chip urethane is formed by crushing waste materials such as slab urethane with a crusher. Conventionally, when a waste material such as slab urethane is crushed by a crusher, the crushing method is a cutting method (guillotine method). Therefore, as shown in FIG. 4, the chip urethane is a granular chip material 6 of 6 to 12 mm. Was becoming.

A urethane-based binder is mixed with these chip materials 6 by a mixer, the mixture is inserted into a press mold comprising a lower mold and an upper mold, press-molded into a desired shape, and steam is added to the binder to react. Chip urethane is formed by curing.

[0004]

Since the conventional method of crushing waste materials such as slab urethane is a cutting method, it is 6 to 12 mm.
0.04g / c using waste materials such as granular slab urethane
When forming a low density urethane chips of m ^3, poor surface quality and rough surface, becomes Bosoboso, poor shape retention, also tensile urethane properties, with respect to tear strength, tensile urethane chips, tear The strength was low, and there was a risk of fatigue.

Further, although steam is added to the binder for reaction curing, the blowing time of steam is long, the molding time combined with the reaction time is long, and the drying time for removing water from the molded product after molding is long. Therefore, there is a drawback that the working efficiency cannot be improved.

The object of the present invention is to reduce the cost by reducing the amount of waste materials such as slab urethane with a desired hardness without fear of deteriorating the surface quality even if the density of chip urethane is low. A method for producing a chip urethane capable of shortening the molding time and the drying time, significantly improving the work efficiency, improving the tensile and tear strength of the chip urethane, and preventing settling. Is provided.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a method for producing chip urethane according to claim 1 is to pulverize a waste material such as urethane with a pulverizer to obtain a chip material. In the method for producing a chip urethane formed by mixing the chip material with a urethane binder with a mixer and molding the mixture with a press mold, the chip material formed by crushing with the crusher is urethane. After mixing the system binder with a mixer and inserting the mixture into a press mold, water vapor having a water content necessary for the reaction of the urethane binder is supplied to the mixture to react the urethane binder and the urethane system. It is characterized in that the mixture is supplied with hot air in an amount of heat necessary for curing the binder.

According to a second aspect of the present invention, in the method for producing a chip urethane, a waste material such as urethane is crushed by a crusher to form a chip material, and the urethane binder is mixed with the mixer by a mixer. In a method for producing a chip urethane formed by molding a mixture with a press mold, a chip material formed by pulverizing with the pulverizer is formed into a linear or strip having an appropriate length, and the linear or strip is formed. Mixing the urethane binder with the chip material with a mixer to form a mixture with the linear or strip-shaped chip material entangled, and after inserting the mixture into a press mold, it is necessary for the reaction of the urethane binder. The amount of heat required to cure the urethane binder while supplying water vapor with a sufficient amount of water to the mixture to cause the urethane binder to react. And supplying hot air into the mixture.

[0009]

According to the method for producing a chip urethane according to the first aspect of the present invention, water vapor having a water content necessary for the reaction of the urethane-based binder is supplied to the mixture to react the urethane-based binder with the urethane-based binder. Since the hot air of the amount of heat necessary for curing the system binder is supplied to the mixture, it is possible to shorten the blowing time of steam, shorten the molding time, and reduce the amount of residual water in the molded product. The drying time can be significantly shortened.

According to the method for producing a chip urethane according to the second aspect of the present invention, the chip material crushed and formed by a crusher is formed into a linear or strip shape having an appropriate length, and the linear or strip shape is formed. By mixing a urethane-based binder to the chip material of 1. with a mixer, a mixture is formed in a state in which the linear or strip-shaped chip material is entangled, and after inserting the mixture into a press mold, the reaction of the urethane-based binder is performed. Water vapor of a necessary amount of water is supplied to the mixture, the urethane binder is reacted, and hot air of the amount of heat necessary for curing the urethane binder is supplied to the mixture, so even if the density is low, chip urethane It is possible to improve the surface quality of the molded product, reduce the amount of waste materials such as slab urethane used with the desired hardness, and reduce the cost. In addition, the steam blowing time and the molding time can be shortened, the molded product has a small residual water content, the drying time can be remarkably shortened, and the work efficiency can be remarkably improved. The tensile strength and tear strength can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for producing a chip urethane according to the present invention will be described in detail below with reference to the drawings. FIG. 2 shows an outline of an embodiment of a chip urethane manufacturing apparatus for carrying out the chip urethane manufacturing method of the present invention. This manufacturing apparatus 11 grinds a waste material 13 such as urethane to chip material. It has a crusher 15 which forms 16.

The waste material 13 such as urethane is made into a compressed state by a pair of upper and lower material pressing and feeding rollers, and in this state, the waste material 13 such as urethane is cut by a plurality of cutter blades provided on the rotating drum to form a 1 to 3 mm square , And is crushed into a long linear or strip-shaped chip material 16 having a length of 6 to 30 mm.

Chip material 16 crushed by a crusher 15
3 is formed on a linear or strip-shaped tip material 16 as shown in FIG. 3, but as shown in FIG. 4, a conventional guillotine type tip material 6 may be mixed and used.

The linear or strip-shaped chip material 16 is housed in a silo 17 as a material stocker. The linear or strip-shaped chip material 16 is supplied from the silo 17 to the mixer 19, and the urethane-based binder 20 is supplied to the mixer 19 according to the amount of the chip material 16.

The mixer 19 mixes the linear or strip-shaped chip material 16 and the urethane binder 20. By this mixing step, the linear or strip-shaped chip material 16 is entangled in a net shape, and they are overlapped with each other to form a three-dimensional structure by the urethane-based binder 20.

Then, a mixture 24 of the chip material 16 and the urethane-based binder 20 is added to the lower mold 22 of the press mold 21.
And an upper mold 23 that is vertically movable up and down to form a desired shape. As shown in FIG. 1, the press mold 21 has a small chamber 27 formed below the bottom wall 26 of the lower mold 22.

A steam generator 28 and a hot air generator 29 are connected to the small chamber 27. Small holes 2 in the bottom wall 26
A large number of 6a are formed, and a drain valve 30 is provided at the bottom of the small chamber 27.

A switching valve 33 is provided in the middle of the pipes 31 and 32 connected to the steam generator 28 and the hot air generator 29, respectively, and the small chamber 2 is connected via the switching valve 33.
A pipe 34 is connected to 7.

The upper mold 23 of the press mold 21 is lowered,
Mixture 24 of chip material 16 and urethane-based binder 20
In the compressed state, steam is supplied from the steam generator 28 to the small chamber 27 of the press mold 21. The water vapor is supplied into the lower mold 22 through a large number of small holes 26a in the bottom wall 26 of the lower mold 22.

Water and heat are supplied to the urethane-based binder 20 by means of steam to react the urethane-based binder 20. Next, the switching valve 33 is operated to operate the hot air generator 2
Hot air is supplied from 9 to heat and cure the urethane-based binder 20. Alternatively, only the hot air generator 29 may be operated after the steam generator 28 and the hot air generator 29 are used together.

The time for blowing the steam by the steam generator 28 is 1450 mm × 750 mm × 470 mm when the size of the mixture 24 of the chip material 16 and the urethane binder 20 is 1450 mm × 750 mm × 470 mm.
When the steam pressure is 3 to 5 kg / cm ² and the steam pipe diameter is 1 inch, the tip material 16 has a specific gravity of 0.06 for about 3 minutes, and the tip material 16 has a specific gravity of 0.08 for about 4 minutes. The specific gravity of the material 16 is 0.10, which is about 5 minutes.

The blowing time of the hot air from the hot air generator 29 is about 1.6 when the specific gravity of the chip material 16 is 0.06.
5 minutes, the specific gravity of the tip material 16 is 0.08, about 2 minutes, and the specific gravity of the tip material 16 is 0.10, about 2.5 minutes.

A molded article can be obtained by injecting steam and hot air by the steam generator 28 and the hot air generator 29 and then drying for about 4 hours. still,
Table 1 shows molding conditions according to the present invention and conventional molding conditions.

Table 1

As shown in Table 1, according to the present invention, the molding time and the drying time can be significantly shortened.

[0026]

The above is the method of one embodiment of the method for producing a chip urethane according to the present invention. According to the method for producing a chip urethane according to claim 1 of the present invention, waste materials such as urethane are crushed. Crushed by a machine to form a chip material, a urethane binder is mixed with the chip material by a mixer, and the mixture is molded by a press mold. A urethane binder is mixed into the chip material formed by a mixer with a mixer, the mixture is inserted into a press mold, and then water vapor having a water content necessary for the reaction of the urethane binder is supplied to the mixture to form the urethane binder. In addition to reacting with, the hot air of the amount of heat necessary for curing the urethane-based binder is supplied to the mixture, so that the blowing time of steam is Can be shortened, it is possible to shorten the molding time, also reduces the amount of residual moisture in the molded article, it can be significantly reduced the drying time.

According to the method for producing chip urethane according to the second aspect of the present invention, the chip material formed by crushing with a crusher is formed into a linear or strip shape having an appropriate length, and the linear or strip shape is formed. By mixing a urethane-based binder to the chip material of 1. with a mixer, a mixture is formed in a state in which the linear or strip-shaped chip material is entangled, and after inserting the mixture into a press mold, the reaction of the urethane-based binder is performed. Water vapor of a necessary amount of water is supplied to the mixture, the urethane binder is reacted, and hot air of the amount of heat necessary for curing the urethane binder is supplied to the mixture, so even if the density is low, chip urethane It is possible to improve the surface quality of the molded product, reduce the amount of waste materials such as slab urethane used with the desired hardness, and reduce the cost. In addition, the steam blowing time and the molding time can be shortened, the molded product has a small residual water content, the drying time can be remarkably shortened, and the work efficiency can be remarkably improved. The tensile strength and tear strength can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a press mold used in a method for producing a chip urethane according to the present invention.

FIG. 2 is a schematic explanatory view of a manufacturing apparatus used for carrying out the method for manufacturing chip urethane according to the present invention.

FIG. 3 is an explanatory view of a linear or band-shaped chip material of the chip urethane according to the present invention.

FIG. 4 is an explanatory view of a conventional chip material.

[Explanation of symbols]

 11 Manufacturing Equipment 13 Waste Materials such as Urethane 15 Crusher 16 Chip Material 17 Silo 19 Mixer 20 Urethane Binder 21 Press Mold 22 Lower Mold 23 Upper Mold 24 Mixture 26 Bottom Wall 26a Small Hole 27 Small Chamber 28 Steam Generator 29 Hot Air Generator 33 Switching valve

[Table 1]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location B29K 105: 26 B29L 31:58 (72) Inventor Koji Yamada 771 Kozoen, Ayase City, Kanagawa Prefecture Ikeda Product Stock Company (72) Inventor Akira Ito 2208 Ono, Hamakita City, Shizuoka Prefecture Hiei Industry Co., Ltd. (72) Inventor Yoshiyuki Akiyama 2208 Ono, Hamakita City, Shizuoka Prefecture Hiei Industry Co., Ltd.

Claims (2)

[Claims] 1. A chip urethane formed by crushing a waste material such as urethane by a crusher to form a chip material, mixing a urethane binder with the chip material by a mixer, and molding the mixture by a press mold. In the manufacturing method, the urethane-based binder is mixed with the mixer into the chip material formed by crushing with the crusher, and the mixture is inserted into the press mold, and the amount of water necessary for the reaction of the urethane-based binder is adjusted. Supplying steam to the mixture,
A method for producing chip urethane, which comprises reacting the urethane binder and supplying hot air of a heat amount necessary for curing the urethane binder to the mixture. 2. A chip urethane formed by crushing a waste material such as urethane with a crusher to form a chip material, mixing the chip material with a urethane-based binder by a mixer, and molding the mixture with a press mold. In the manufacturing method, the chip material formed by crushing with the crusher is formed into a linear or strip shape having an appropriate length, and the linear or strip chip material is mixed with a urethane binder by a mixer, A mixture is formed in a state in which linear or strip-shaped chip materials are entangled, the mixture is inserted into a press mold, and then water vapor having a water content necessary for the reaction of the urethane-based binder is supplied to the mixture to form the urethane-based material. A chip ureter characterized by reacting a binder and supplying the mixture with hot air in an amount of heat necessary for curing the urethane-based binder. Manufacturing method.