JPS60219016A - Recycling method of fibrous sheets - Google Patents

Abstract

PURPOSE:To easily granulate the surface of fibrous sheets such as marginal material of carpet by roughly crushing fibrous sheets, melting the resin component at low melting point with friction heat on a crusher and further crushing the component, while cooling, into a granulated object containing fibers. CONSTITUTION:Fibrous sheets 1 having heat-melting resin constituent at high melting point heat deposited or adhered in the form of raising on a lining 11 mainly consisting of heat-melting resin constituent at low melting point are roughly crushed and then are fed into a crusher. Only the constituent at low melting point among other roughly crushed materials is softened and melted by friction heat generated by shearing action on the crusher. If the temperature of the treated material reached close to the melting point of fibrous material, the treated material is cooled. The crusher is further driven to crush to produce granulated object containing fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for recycling fibrous sheet bodies such as car vent waste, and in particular to a method for reusing aqueous phase produced during the processing of carpets for automobile interiors.

(Prior Art) Water particles discharged during the processing of automobile interior carpets have conventionally been disposed of as waste. slightly,
Only a portion of the fibrous sheet material is recovered by dehairing means and used as a raw material for felt and the like. When dehairing the fibers from this fibrous sheet body, 1 is usually used.

A method is adopted in which the fibrous material is scraped off using a dehairing machine that rotates a rotating drum with needles on its surface. According to this method, it is possible to dehair fibers with long fibers such as tufted carpet, and it is impossible to dehair fibers with short fibers such as 21-dollar punch carpet, so they are discarded. treated as an object. It is preferable to utilize such auspicious water from the viewpoint of effective use of resources.

(Objective of the Invention) An object of the present invention is to provide a method for easily and inexpensively recycling fibrous sheet bodies such as carpet mats without dehairing or the like. Another object of the present invention is to provide a method for recycling a fibrous sheet body, which can minimize the thermal history during the treatment process and therefore minimize the deterioration of the material resin properties. Still another object of the present invention is to provide a method for effectively utilizing the moisture of a carpet that cannot be dehaired.

(Structure of the Invention) In the method for recycling a fibrous sheet body of the present invention, fibers made of a high melting point thermoplastic resin composition are coated in a sheet-like backing material mainly composed of a low melting point thermoplastic resin composition. A process of coarsely crushing a fibrous sheet body fixed to a fibrous material to obtain a coarsely crushed material, the coarsely crushed material is put into a crusher, and the low melting point heat in the coarsely crushed material is generated by the frictional heat generated by the shearing action of the crusher. A step of softening and melting the plastic resin component, a step of cooling the treated material when the temperature of the treated material reaches a temperature near the melting point of the composition fiber, and a step of further driving the pulverizer to crush the treated material. The method further includes a step of pulverizing to obtain granules mixed with fibers, thereby achieving the above object.

For example, there is one carpet/seven shrine used in the present invention.

As shown in FIGS. 1 and 2, it is a fibrous sheet body l. This has fibers 12 made of a high melting point thermoplastic resin composition attached in a raised manner to a backing material 11 mainly made of a low melting point thermoplastic resin composition. Both are integrated by heat fusion or adhesive. This backing material 11 has a low melting point, for example, one or more types of polyethylene resin, ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, soft vinyl chloride resin, etc. It is a sheet body.

If necessary, an inorganic filler such as calcium carbonate, calcium hydroxide, aluminum hydroxide, mica, or talc is mixed therein. For example, the nap-like fibers 12, 1,
Thermoplastic fibers with a high melting point 2, such as a melting point of 150°C or higher, using one or more types of polypropylene, polyethylene terephthalate, polyamide (nylon), etc.
Or a blend of these.

The fibrous sheet body 1 is roughly pulverized into small pieces by an appropriate means. The shape and dimensions of the coarsely pulverized product obtained need only be the shape and dimensions that can be used in a pulverizer.

There are no special restrictions. If the width is 2511 mm or less, it is preferable in that the degree of mixing with thermoplastic fibers and inorganic fillers such as granular, powdery, and film-like crushed pieces to be mixed in as necessary is good. By mixing other materials such as thermoplastic resin powder and inorganic filler into the coarsely crushed fibrous sheet body 1, variations in the quality of the final product due to raw materials made of various compositions can be reduced. It becomes possible to improve the molding processability of the final product. Inorganic fillers are effective in improving physical properties such as heat resistance, dimensional stability, and mechanical strength, and imparting functionality such as earthquake resistance to the resulting molded product. Such inorganic fillers include, for example, calcium carbonate, mica, and talc.

Examples include aluminum hydroxide.

These coarsely pulverized products are passed through a pulverizer. The pulverizer does not need to be particularly special, as long as it is capable of softening and melting only the low melting point composition in the coarsely pulverized material using the frictional heat generated by the shearing action while pulverizing the coarsely pulverized material. When the system reaches near the melting point (=J) of the fiber material, especially the high melting point composition, it is cooled by injecting cooling water or the like into the mill or the processed material in the mill.After cooling, if necessary, Further, a pulverizer is driven to further pulverize the processed material to obtain granular materials mixed with fibers.

This fiber-incorporated granule can be formed into a sheet. The temperature conditions for molding are based on 9 granular raw materials.

For example, the molding temperature is set to a temperature suitable for relatively low melting point compositions such as polyethylene and ethylene-vinyl acetate copolymers. Its temperature is below 150°C.

Therefore, 'relatively high melting point fibers in the raw material composition.

For example, polypropylene, polyethylene terephthalate, polyamide, etc. are molded while maintaining the fiber shape in a matrix of a low melting point composition. A two-foam molded product can also be obtained by adding an appropriate amount of foaming agent during molding.

The sheet-like molded product obtained in this way is reinforced with fibers, so its strength is high. If the molding is carried out at the temperature of the high melting point composition, there is a risk that the low melting point components in the raw materials will decompose and gasify, making it difficult to obtain a good molded product.

The sheet-like molded product obtained in this way can be used as it is, if necessary.

It is also possible to form a composite molded article by subjecting it to lamination molding with other materials 9, such as nonwoven fabrics, films, foams, etc.

Sheet-like molded products and composite molded products with other materials.

If necessary, any shaped body can be obtained by processing such as pressure molding or vacuum forming.

(Example) Examples of the invention will be described below.

Example 1 As a fibrous sheet body, a ring material used in the processing of car vents for automobile interiors was used. The backing material for this hoop is a polyethylene sheet in an amount of 200 g and 7 m. The raised fibers of this hoop were of a needle-punched curved type made of polypropylene fibers. The length of this ring was 1-2 m and the width was 5-25 cm. This aqueous phase was passed through a conventional pulverizer (Model KB-340 manufactured by Horai Iron Works) to obtain a coarsely pulverized product with a width of 5 cm and a length of 5 to 1Q cm.

Next, this coarsely pulverized material was put into a pulverizer 2 as shown in FIG. This crusher 2 is equipped with a tank 21 having a capacity of 300°C. A fixed blade 22 is installed in the tank 21 at the tank bottom 2.
3 are provided at equal intervals over 10 locations. At the center of the tank 21, a rotating blade 24 is pivotally attached to a rotating shaft 25. A rotary blade 26 is fixed on the rotary blade 24 so as to face each other. The rotating blade 24 can be rotated at high speed by an electric motor 28 through a rotating shaft 25 and a belt transmission mechanism 27 connected thereto.

A crusher with this structure is commercially available under the trade name of Super Glasosh Mixer (Shouen Seisakusho) and is used as a scrap recovery machine for films such as polyethylene and polypropylene, leather with PVC cloth, foamed polyethylene, polyester, etc. has been done.

In this crusher 2, 15k of the above-mentioned coarsely crushed carpet scraps are
g was charged from the raw material input port 29 of the tank 21.

The rotation speed of the rotating blade 24 was 1600 rpm.

Approximately 3 minutes after the addition, the carburetor scraps reached a semi-molten state.

The resin temperature at that time was 95°C. Next, water 1,57! from the raw material input port 29! was injected. Rotating blade 24
When the zero rotation was continued for another minute and 30 seconds, most of the injected water was exhausted to the outside of the yarn from the raw material input port 29 as steam. Opening/closing lid 3 of treated material outlet 30 of tank 21
1 was opened and the processed material was taken out. The obtained granules had an average size of about 5 grains. The apparent bulk density of this granule was 0.3 kg/β.

The apparent bulk density of car vent waste before treatment is 0.05k.
g/Il, the apparent volume of the treated material is 1/6
has decreased to

(Example 2) The granules obtained in Example 1 were formed into a sheet using a conventional extruder. The extruder has a screw diameter of 5011
And a 25 L/D axle screw extruder was used. A T-die with a slit width of 500 and a slit gap of 2u was installed at the exit of the extruder.

The molding conditions were adopted: the extruder cylinder temperature was 180-195°C, the mold temperature was 190°C, the screw rotation speed was 3Q rpm, and the extrusion rate was 12 kg/hour. When the extruded sheet was pinched with a cooling roll and pulled out 9
A uniform sheet 1- with a width of 420F1m and a thickness of 1.5mm was obtained. The physical properties of the obtained sheet were as follows.

Next, the extruded sheet was molded using a mold for an automobile trunk room member. The sheet was heated for 2 minutes in a heating atmosphere of 155° C. and set in the mold. 2k
A trunk room member molded body was obtained by pressure forming using compressed air at a pressure of 1.3 g/cm. It also passed an impact test by dropping a 500g steel ball from a height of 1m.

(Effects of the Invention) According to the present invention, carpet scraps can be effectively utilized in this way. Moreover, the glass material is once processed into granules with a relatively large bulk density.

When further molding this into a suitable molded article, a normal molding machine (extruder or injection molding machine) can be used as is. Productivity is not compromised either. Also.

At the stage of obtaining granules, only the low-melting point thermoplastic resin used as the backing material is melted, and the fiber material is not melted, so damage to resin properties due to heat or oxidative deterioration during processing is minimized. It can be done.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are a perspective view and a partially enlarged perspective view showing an example of a fibrous sheet body used in the present invention, respectively;
FIG. 3 is a partially sectional side view showing an example of a crusher used in the present invention. DESCRIPTION OF SYMBOLS 1... Fibrous sheet body, 11... Lining material, 12.
...Napped fiber, 2...Crusher, 21...Tank,
22...Fixed blade. 24... Rotating blade, 26... Rotating blade, 2B... Electric motor, 29... Raw material input 0.30... Processed material outlet.

Claims (1)

[Scope of Claims] 1. A fibrous sheet body in which fibers made of a high melting point thermoplastic resin composition are fixed in a raised manner to a sheet backing material whose main component is a low melting point thermoplastic resin composition. A step of coarsely pulverizing to obtain a coarsely pulverized product, the coarsely pulverized product is put into a pulverizer, and the low melting point thermoplastic resin component in the coarsely pulverized product is softened and melted by the frictional heat generated by the shearing action of the pulverizer. a step of cooling the treated material when the temperature of the treated material reaches a temperature near the melting point of the high melting point composition fiber, and further driving the pulverizer to further crush the treated material to mix fibers. A method for recycling a fibrous sheet body, the method comprising the step of obtaining a granular material. 2. The low melting point thermoplastic resin composition has a melting point of 150°C.
A method according to claim 1, which is: 3. Claim 1 or 3, wherein the low melting point thermoplastic resin composition is at least one of polyethylene resin, ethylene-vinyl acetate copolymer, ethylene-vinyl chloride copolymer, and soft vinyl chloride resin. The method described in Section 2. 4. The method according to claim 1, wherein the high melting point thermoplastic resin composition has a melting point of 150°C or higher. 5. The high melting point thermoplastic resin composition is polypropylene,
The method according to claim 1 or 4, comprising at least one of polyethylene terephthalate and polyamide. 6. The method according to claim 1, wherein the granular material is formed into a sheet shape.