JP2526055B2 - Molded product with leather-like surface layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention mainly relates to woven fabrics, knitted fabrics, non-woven fabrics made of natural fibers, recycled fibrous fibers, synthetic fibers, and napped fabrics thereof, synthetic leather or natural leather, etc. When applying and forming a leather layer containing a leather powder on the surface of the sheet-shaped base material by a coating method such as a doctor knife method, a roll coater method, a slit cot method, a spray method or an air knife coater method, the formed film is formed. The present invention relates to the provision of a molded article having a surface skin layer in which leather powder is evenly and evenly scattered, and the mixed leather powder does not become deflocculated, and which has good properties similar to those of natural leather.

(Prior Art) Recently, it has been attempted to make natural leather into a powder and mix the leather powder into a polyurethane resin or other synthetic resin to form a resin.

The use of such leather powder is aimed at improving synthetic or artificial leather. That is, the present synthetic leather is based on a woven or knitted fabric, and the surface of sponge leather made of a foam such as vinyl chloride, polyamide or polyurethane is treated with a modified polyamide, polyurethane or polyacrylic acid derivative. In addition, artificial leather comprising a porous structure of a three-dimensional fiber entangled body of special fibers such as a hollow root fiber and a bundle of fine fibers and a binder mainly composed of an elastomer (polyurethane) has also been developed.

These synthetic leathers or artificial leathers have characteristics similar to those of natural leathers, and have excellent breathability, moisture permeability, water repellency, and excellent heat retention function.

However, these synthetic leathers or artificial leathers only have a water absorbing function due to capillary action, and do not have a water absorbing function due to tissue swelling.

Moreover, the amount of voids between tissues is adjusted as the tissue swells, and it does not have the function peculiar to natural leather for controlling air permeability.

Therefore, the present applicant has tried to make a natural leather into a powder form and mold the powdery natural leather itself together with a synthetic resin, or to form a sheet form using the synthetic resin as a binder.

The advantages of powdering the natural leather itself and molding it with a synthetic resin material can be increased.

One of them is that since the molded product has natural leather itself, water absorption due to swelling of the mixed leather powder,
Since it has a moisture absorption function, it was possible to provide a molded product having a good feeling of touch without stickiness.

Two of them, since natural leather powder is contained in the molded product, it is possible to provide a molded product having a different contact resistance than the resin molded product.

The third reason is that since natural leather powder is contained in the molded product, the static electricity charge that is usually generated in the synthetic resin molded product is eliminated, and dust particles are attached and the static electricity is discharged due to the static charge. It was possible to provide a molded product with no discomfort.

Further, it has been clarified experimentally that the cold resistance property of the resin molded product can be enhanced by including the natural leather powder in the molded product.

However, each of these leather-like molded products requires considerable molding equipment because the molded product contains a large amount of leather powder, and naturally there is a limit to the object to be molded. Naturally, the molded product has leather powder not only on the surface of the molded product but also on the entire surface, and the amount of leather powder used is large, but the amount of leather powder actually exposed on the surface is very small. Had a drawback that was Further, when the leather powder appears on the surface of the molded product as much as possible, it is necessary to increase the amount of the leather powder to be mixed, and the mixed leather powder tends to significantly impair the characteristics of the molding resin. In addition, such inconvenience is particularly caused when the resin is molded.

Therefore, the present applicant has attempted to eliminate such inconveniences by forming a skin layer containing leather powder only on the surface of the molded product.

In the present invention, various methods have been studied for crushing such natural leather to obtain a leather aggregate which becomes a skin layer.

One of them is a method of mechanically breaking a leather material to obtain a leather powder having a target particle size.

In this method, chrome-tanned leather is cut into pieces of about 30 mm in length, cut into kelp-like fiber waste, and put into a crusher for crushing.

As a result of many experiments, in order to obtain a coating film with a smooth surface and no roughening of surface irregularities due to mixed leather powder, and with no pinholes or tears, it is mixed in the resin for molding. It was found that the finer the leather powder, the better the finish. That is, it has been clarified that the fine leather powder incorporated into the leather molding resin causes the entire molding film to have properties peculiar to leather and does not impair the characteristics of the resin constituting the film itself.

Therefore, the applicant of the present invention pulverized the leather by the following mechanical method in order to make the leather into a fine powder through many experiments.

It is dried (1.9-2.4% by weight in an actual experimental plant) so that the water content of the leather around 30 mm cut into the kelp shape is within 3% by weight (wet base), and this is crushed with a hammer type. It is put into a machine under the following conditions and crushed by impact shearing.

Hammer type crusher Rotational speed 3800 (rpm) Screen screen 32 mesh Input material 0.2Kg Processing time 0'27 ″ (27 seconds) Product amount 0.025Kg By the above crushing (below sieve) (above sieve) (distribution amount) ~ 32 mesh 0.8% 32 to 48 mesh 2.4% 48 to 60 mesh 8.2% 60 to 100 mesh 15.5% 100 to 150 mesh 18.4% 150 to mesh 54.7% leather with a grain size distribution The powder was able to be obtained. (The relationship between the mesh and the micron regarding the particle size is about 30 mesh-500 μm, 50 mesh-300 μm, 60 mesh-250 μm, 70 mesh-212 μm.
m, 100 mesh-150 μm, 140 mesh-106 μm, 20
The description will be given below assuming that 0 mesh is −75 μm. ) (Problems to be solved by the invention) However, the apparent specific gravity of leather powder obtained by the above method is
It was extremely low at 0.1 to 0.2 g / cc, and when it was photographed with an electron microscope (magnification of 100 times), it was found to have the shape of the photograph in FIG. (It is stretched 1.6 times at the time of baking.) That is, in the above method, there are more leather powder finer than 150 mesh (particle size of about 100 microns), but long fiber (particle size of about 800 microns) leather powder. It was a leather powder with a low apparent specific gravity.

Also, with the leather powder produced by the above-mentioned forced drying and impact shearing, the produced leather powders become entangled with each other in the storage state and become a cotton-like state (a state in which cotton is unwound), and at the time of mixing with the film-forming resin. It was found that the leather powders aggregate with each other and cannot be separated.

As a result, when the leather powder produced by the above forced drying and impact shear is mixed into the film-forming resin to form a coating film, the inconvenience that the leather powder aggregates like a cotton on the surface of the film and emerges occured.

In particular, when the coating film to be applied and formed is formed in an ultra-thin film with a thickness of about 0.01 to 0.05 mm, defibrated leather powder may be present in a series across both surfaces of the film. The leather powder causes the film to be cut into edges, and the unwounded leather powder comes out to form holes, and the film is torn from the cut edges.

Also, when the coating used for coating and forming is made thin as described above, there is a disadvantage that the cotton-like portion of the mixed leather powder sticks out from the coating surface, and the coating surface does not become smooth, resulting in a rough feeling. There was an inconvenience.

Furthermore, a film is applied to the surface of a sheet-like product such as cloth, non-woven fabric, leather or synthetic leather or a plate-like product such as a panel,
When forming, a wavy phenomenon peculiar to the film surface may occur,
There was an inconvenience that caused a dragging phenomenon.

(Means for Solving Problems) Various woven fabrics, knitted fabrics, non-woven fabrics and their raised fabrics, synthetic leather or natural leather, and the like directly coated with a film forming resin such as a polyurethane resin solution having leather powder on the surface thereof. Apply
The purpose is to form a surface skin layer having a thickness of 0.01 to 0.1 mm on the surface of these products, and in order to achieve such an object, leather powder rooted in film-forming resin is I assumed that.

Apparent specific gravity: 0.38 to 0.50 (g / cc) Moisture content: 3% by weight or less Grain size: Selected by a 40 mesh sieve, and more than 70% by weight of the leather powder in a finer range than 40 microns (action) It has been found that the molded article having the leather-like surface layer according to the present invention has the following effects due to the above characteristic constitution.

(1) It was found that the leather powder mixed in the coating resin formed by coating has a "granular" form without being deflocculated, and is uniformly dispersed and mixed in the coating resin. (The slipperiness of the leather powder itself is good) (2) The leather powder in the molded film is not intervened as a series between both sides of the film, and there are holes due to the lack of the mixed leather powder, or the mixed leather powder. It has been found that there is no edging and tearing from the peripheral edge, and wrinkles due to such edging or difference in expansion and contraction (between the film material and the leather powder) can be prevented.

(3) It was possible to easily form a skin layer having a uniform thickness and a large amount of leather powder only on the surface of the molded product. (In the conventional example, the mixing amount of the leather powder was naturally limited due to injection or extrusion resistance.) (4) Further, the surface skin layer to be formed is 0.01 to 0.1 mm, which is a base molding. It is often communicated by leather powder mixed between the inside of the item and the outside air,
It gives the molded article a certain moisture permeability.

(5) Further, since the leather powder to be mixed does not become deflocculated, it can be applied in a uniform thickness without waviness or pulling of the formed film when applied to a cloth, a non-woven fabric or the like.

(Example) A typical example of a molded article having a leather-like surface layer according to the present invention will be described below. In this example, leather powder incorporated into a film forming a surface skin layer of a molded article which is easier to understand, a synthetic resin forming the film, mixing of both, and application of the film will be described respectively. .

(A) Leather powder and its molding method Shaving scraps treated with chrome tan, which are leather scraps that are usually discharged in large amounts during the molding of leather powders, were used. This shaving waste was twisted into a long kelp shape, and this was cut into a length of 5 mm or less with a cutter mill and put into the processing chamber 1 shown in FIG.

600 kg of leather having a moisture content of 50 to 60% by weight (wet base) is put into the processing chamber 1, and steam A is supplied to the processing chamber 1 while adjusting the valve 2 so that the chamber pressure becomes about 1 kg / cm ^2.
(A 'represents the exhaust steam of the steam A),
The temperature inside the processing chamber is set to around 100 ° C to 119 ° C.
The leather was stirred for a minute with stirring means 3.

It has been confirmed that the leather thus extracted by steam heating has an increased water content in the range of 5 to 10% by weight depending on the type and properties of the leather.

In addition, the apparent specific gravity of the leather powder that is molded by this steam heating is
Continue until 0.38 to 0.50 g / cc. Therefore, this steam heating determines the treatment time depending on the amount of treated leather to be put in, the temperature in the treatment chamber, the water content of the pressure-treated leather in the treatment chamber, etc. The higher the room pressure and the treatment temperature, the shorter the treatment time. The swelling treatment will be completed to achieve the desired apparent specific gravity of 0.38 to 0.50 g / cc.

Therefore, at low temperature, steam heating in low pressure, because the apparent specific gravity of this molded leather powder is 0.38 ~ 0.50 g / cc, more processing time is required, it is unsuitable as a manufacturing plant, It was found that the above example was one of the optimum processing conditions experimentally.

By the way, the above chrome tanned 50-60% by weight
In the treatment of leather having a water content of 100 ° C. to 120 ° C., the leather is heated and swelled by the supplied steam for 30 minutes in the temperature range of 100 ° C. to 120 ° C., and evaporation from the swollen leather is performed. , Leather powder that causes shrinkage of collagen fibers that make up the skin better than being subjected to liquefaction and moisturization due to condensation over time, and that the apparent entanglement is in the range of 0.38 to 0.50 g / cc Was taken.

Further, when the chrome tanned leather was treated under the conditions of the above-mentioned example (water content of leather, processing chamber pressure, temperature, time, etc.), the molded leather powder became deflocculated and the apparent specific gravity was 0.2 g / It was found to be between cc and 0.3 g / cc.

Furthermore, when the same treatment as in the above example is carried out under extremely low conditions (20% by weight to 30% by weight) of the water content of the treated leather to be charged, which is different from the above example, the molded leather powder becomes deflocculated, It was found that the apparent specific gravity was 0.2 g / cc to 0.3 g / cc.

From the above points, when processing leather, the type of leather,
It was clarified that the treatment conditions should be determined depending on the properties and the content of the pretreatment, but steam is sufficient until the apparent specific gravity when the leather to be treated is molded as leather powder is 0.38 to 0.50 g / cc. Unless it is heated while maintaining the swollen state, the leather powder to be molded will be deflocculated and the apparent specific gravity will be 0.
It was lower than 3g / cc and proved unsuitable for use. or,
It was found that when the leather to be treated was treated to a boiling state, the leather was cured by the subsequent treatment and was not suitable for use.

In the above steam heating, the outer circumference of the processing chamber may be covered with a jacket 4, and steam for processing heating may be separately supplied to the jacket 4 to simultaneously perform heating from the outside of the processing chamber.

With respect to the leather that has been subjected to the steam heating treatment described above, the supply of the steam A to the processing chamber 1 into which the leather is put is stopped,
The steam B (operating the valve 5 so that the pressure is 1 kg / cm ² ) is supplied to the jacket 4 (B ′ represents the exhaust steam of the steam B.) The leather in the processing chamber is heated for 30 minutes. After drying (primary drying), the water content of the leather was adjusted to within 15% by weight.

Further, this leather was subjected to secondary drying to forcibly dry it to a water content of 3% by weight or less, and then ground using a fine victory mill.

The operation of this fine victory mill is 7,000 rpm
(Rpm), the empty / actual movement was 17.2 / 20 (amperes) with the slit half open. In another embodiment, the rotation speed is 7800
(Rpm), the empty / actual operation was 15.8 / 20 (amperes) and the slit was fully opened.

The leather crushed by the above crushing treatment has an apparent specific gravity.
It was in the range of 0.38 to 0.50 g / cc, which was screened using a 40-mesh sieve to give the following particle size distribution.

(Under sieve) (Over sieve) (Distribution amount) 40-60 mesh 2.8% 60-80 mesh 9.7% 80-100 mesh 9.7% 100-150 mesh 25.7% 150-200 mesh 13.9% 200-300 mesh 33.7% 300- Mesh 4.5% In addition, even for crushed leather powder with a similar apparent specific gravity within the range of 0.38 to 0.50 g / cc, the particle size distribution of the leather powder is as follows by coloring it in the steam heating step. I made it to the street.

(Under sieve) (Over sieve) (Distribution amount) 40-60 mesh 5.7% 60-80 mesh 7.0% 80-100 mesh 5.7% 100-150 mesh 39.4% 150-200 mesh 30.0% 200-300 mesh 12.2% 300- Mesh 0% This apparent specific gravity is much higher than the previous leather powder 0.38
It is clear that the range of ~ 0.50g / cc is as shown in the photograph of Fig. 9 that there are no fibrous parts in the leather powder, and the individual leather powders exist independently without being entangled with each other. It is fully understood from what is done.

(The photograph in FIG. 9 is an electron microscope photograph taken at 101 times, and the particle size is measured based on the short diameter of the leather powder.) The apparent specific gravity in this specification is loose apparent specific gravity (Ae
It is rated Bulk Density), and after vibrating the sieve to put the leather powder through the chute into a 100cc container, it is ground and weighed with a precision balance, and the weight of the leather powder divided by 100 is displayed.

Next, the leather powder on the screen was classified by true specific gravity by an air classifier to obtain a leather powder having 70% by weight or more of the total leather powder having a particle size finer than 40 microns.

This classification will be described with reference to FIGS. 2 and 3. 11 is a feeder, into which the above-mentioned leather powder is introduced, and this is sequentially fed to an air classifier (microseparator) 12. This air classifier 12 has a rotor 12a, and separates and sucks the leather powder supplied from the charging port 12b by its true specific gravity, and sends it into the back filter tank 14 by the turbo fan 13 for classification. Then, the classified coarse powder is taken out from the rotary valve 12c, and the fine powder is taken out from the rotary valve 14a.

In addition, 12d shows the intake of the secondary air, and 12e shows the outlet of the classified fine powder.

In this device, the rotation speed of the rotor 12 is 600 (rp
m) Secondary air flow rate is 4.0m ³ / min, dust collection airflow is 12m ³ / min, and 5K so that the leather powder finer than 40 microns is 70% by weight or more.
When g of leather was added, 2.05 Kg of fine powder was obtained.

As shown in the attached graph, the particle size distribution of this classified leather powder was found to have an average particle size of 24.4 microns, and most of them were within 50 microns. It was also found that the apparent specific gravity of this classified leather powder was 0.38 to 0.50 g / cc.

In the finely powdered leather powder produced in this way, there is no mutual entanglement as in the previous example, and the individual leather powders are present independently, and become spongy or aggregate like a dumpling. Then, when it was photographed with a 100 × electron microscope, it was found to be in the state of the photograph in FIG.

As is clear from the photograph of FIG. 10, it was revealed that the epithelial leather powder was in the form of an ultrafine powder, had no fibrous portion, and was not intertwined with each other.

From these, when the apparent specific gravity of the crushed leather powder shows a value larger than at least 0.38 g / cc, it was confirmed that the leather powder does not have a fibrous entangled portion or a woven portion. .

Incidentally, the graph of FIG. 7 shows fine particles classified by a classifier mixed in methyl alcohol in a suspended state and measured by a Coulter counter, and then the range of each particle size is displayed in% by weight, The abscissa indicates the particle size, and the ordinate indicates the distribution amount in weight%.

According to this, leather powder with a particle size smaller than 40 microns is 7
It is clear that it is 8.7% by weight, but when mixed with the above film forming resin, it is possible to mix leather powder with a particle size slightly larger than this, according to the applicant's practice.
70% by weight of the total amount of leather powder with a particle size shorter than 40 microns
It has been found that good results can be obtained if the leather powder having a size of more than 150 microns is effectively cut.

The leather powder molded above is subjected to a dyeing treatment, if necessary. This dyeing treatment was carried out by using an appropriate dye and dyeing method depending on the properties of the target leather powder. For example, in leather powder based on chrome leather, acid dyes such as monoazide, anthraquinone, and carbonium, which have good leveling and penetrating properties, are used, while in leather powder based on tannin leather, basic dyes such as azo, azine, and thiazine. However, depending on other purposes and properties, acidic mordants, direct dyes and reactive dyes were mixed, stirred under humidification to dye the leather powder, and dried again to obtain dyed leather powder.

These dyes may be made in the step of heating the leather with steam, and may be made in the step of pulverizing the leather into leather powder and again under humidifying conditions after forming the leather powder, and according to the aspect of each plant, the The optimum method is adopted.

(B) Leather molding resin and molding method The molding resin that mixes the leather powder to form a coating film on the product surface is generally in the form of a solution or emulsion or melt (including liquid polymer) that is commonly used for coating and the like. The synthetic resin of is intended for use. In the examples of the present invention, 5 to 10 parts by weight of a cross-linking agent and 10 to 70 parts by weight of leather powder are mixed with 100 parts by weight of a two-component reactive urethane elastomer solution containing a solid content of 20 to 50% and used. As a result, it was found that when 10 to 20 parts by weight of the leather powder had a good feel to the touch and the film was smooth, a slight stickiness was produced.

Also, when a film is applied in a stepwise manner between 25 and 55 parts by weight, it feels good to the touch (has a moderate friction resistance), has no sticky feeling, and has a warm feel to the whole and shows characteristics similar to natural leather. At the same time, it was found that the wear resistance of the surface was good.

Furthermore, a coating is formed in stages between 60 to 80 parts by weight,
As a result of confirming the situation in sequence, it was found that the surface of the film became rough as the amount of leather powder increased and 70 parts by weight of the leather powder was mixed into the surface to give a rough feeling.

It was also found that a coating film containing 80 parts by weight of leather powder causes a corrugation phenomenon and pinholes on the film surface.

From the above points, it was found that the mixed use within the range of 10 to 70 parts by weight is the most suitable.

Incidentally, the polyol of the two-component reactive urethane elastomer solution used in the above examples is a polyhydric alcohol such as ethylene glycol, diethylene glycol, propylene glycol, hexylene glycol or trimethylolpropane, and adibic acid, succinic acid, phthalic acid. Acid, a polyester having a terminal OH group obtained by reacting with a polycarboxylic acid such as isophthalic acid, and tolylene diisocyanate,
A chain polymer obtained by reacting with an isocyanate such as 4,4-diphenylmethane diisocyanate, which is used as a solution in which this polyol is dissolved in a solvent such as dimethylformamide, toluene, methyl ethyl ketone or ethyl acetate. ing.

Also, the polyisocyanate blended as a cross-linking agent,
2-tube functional isocyanate such as 4,4-diphenylmethane diisocyanate, 1,5-naphthylene diisocyanate and tolylene diisocyanate, or an adduct of 1 mol of trimethylolpropane with 6 mol of propylene oxide and 3 mol of tolylene diisocyanate Examples of trifunctional isocyanates include compounds obtained by the reaction and compounds obtained by reacting 1 mol of trimethylolpropane with 3 mol of tolylene diisocyanate. These polyisocyanates can be used in a suitable solvent such as ethyl acetate, toluene and methyl ethyl ketone. Used by dissolving.

It has been found that the coating film thus formed by coating has excellent abrasion resistance, absorbs water due to the mixed leather powder, has no sticky feeling, and has no static electricity.

Incidentally, polyester glycol obtained by polycondensation of glycol and dicarboxylic acid, which is a one-pack type urethane elastomer, polycaprolactoglycol obtained by ring-opening polymerization,
At least one of the glycols of polyether glycol
An average molecular weight of 50,000 to 100, produced from a seed, an organic diisocyanate, and a low molecular weight diol or diamine.
000, alone or in mixture, diethylformamide, dimethylacetamide, dimethylformamide,
It should be used as a solution dissolved in a solvent such as tetrahydrofuran, dimethylsulfoxide, dioxane,
The blending ratio of the leather powder to this was the same as that of the two-pack type reactive urethane elastomer solution.

Next, the coating film is usually formed by applying any method such as a doctor knife method, a roll coater method, a slit cot method, a spray method and an air knife coater method. And various resin sheets of these raised cloths, natural leather, synthetic leather or vinyl chloride, polyurethane, polypropylene and the like, and further various resin sheets or resin molded products and metal panels into which the leather powder is mixed. There are various products.

In one embodiment of the applicant, as shown in FIG. 4, a coating film 22 is formed on a sheet 20 by using a coating head 21, and the coating film 22 is sufficiently dried by a drier 23 to be wound up. A film 22 having characteristics similar to natural leather was formed on the surface of the.

When it is necessary to improve the coating condition of the coating film 22 as described above, the surface of the sheet 20 is subjected to sanding or sandblasting, or an adhesive liquid is applied in advance.

In the formation of a coating film that uses this adhesive separately, after impregnating a solvent insoluble in the polyurethane resin on the sheet surface to form a film of the solvent, from the above-mentioned two-component reactive urethane elastomer solution Apply an adhesive solution that
Furthermore, a coating film 22 having excellent abrasion resistance could be formed on the surface of the sheet 20 by applying a dimethylformaldehyde solution of polyester-type urethane elastomer in which the above-mentioned leather powder was mixed according to the respective blending amounts.

Further, on the surface of the sheet 20, apply a foamable two-component urethane elastomer solution mixed with the above-mentioned blending amount of leather powder,
It was possible to foam to form the foamed film 22.

The film 22 thus formed is basically 0.01 to 0.
It consists of a thickness of 1 mm, and on its surface, spray polyurethane paint with leather powder,
Sanding or sand blasting is applied, folding is applied, and leather without embossing is subjected to leather embossing, embossing, and other finishing processes similar to those for natural leather.

A molded article having a leather-like surface according to the present invention is not considered to have a property immediately approximating natural leather by simply forming a coating film on the surface of various products by a roll coater method or the like. Obtained.

The coating 22 formed above does not necessarily have to be a single layer, and may be formed as a multi-layered coating 22. In this case, the thickness of each film should be 0.01 mm to 0.02
mm, the mixing amount of the leather powder of the film 22 ′ (based on the coating resin composition) is 10 to 15% by weight, the mixing amount of the leather powder of film 22 ″ is 20 to 30% by weight, Mixing amount is 40
The weight percentage is set so as to obtain a property closer to that of natural leather as a whole.

In the coating film according to the above example, compared with various resin molded articles made by mixing leather powder, the leather powder contained in the film is overwhelmingly large, and the film surface is smooth and rough,
It has the feature that it is a coating film without wrinkles.

(Effect) The molded article having the leather-like surface layer according to the present invention is configured as described above, and the leather powder mixed in the coating resin is not spongy but has a granular shape, and its lubricity is good. Therefore, it is evenly and uniformly mixed and mixed with the film resin, the mixed leather powder is completely taken into the meat of the molded film, and it does not protrude from the film surface or float on the film surface, and the smooth film surface Can be formed.

Further, the leather powder in the molded film is not intervened as a series between both surfaces of the film, there is no opening due to the lack of the mixed leather powder, or there is no edging and tearing from the peripheral edge of the mixed leather powder, Also, there is no wrinkle due to such edge breakage or difference in expansion and contraction.

Further, since it is possible to easily form a skin layer having a uniform thickness and a large amount of leather powder only on the surface of the molded product, it is not necessary to bother to make a molded product having a large amount of leather powder, and the leather powder is included. Elimination of the injection and other equipment required for molding the molded article.

Furthermore, since the formed surface skin layer is as thin as 0.01 to 0.1 mm, the inside of the base molded product is often in contact with the outside air due to the leather powder mixed in the surface skin layer, and the molded product is Provides moisture permeability.

[Brief description of drawings]

FIG. 1 is a block diagram showing a steam heating device for forming leather powder according to the present invention, FIG. 2 is a block diagram of a leather powder classifying device, FIG. 3 is a block diagram of the same classifier, and FIG. FIG. 5 is a configuration diagram of an apparatus for forming a coating film, FIG. 5 is a cross-sectional view of a coating film formed on a release paper, and FIG. 6 is a cross-sectional view of a coating film formed in multiple layers on a sheet, FIG. Is a graph showing the distribution of leather powder,
FIG. 8 is a drawing-substitute photograph showing the shape of a conventional leather fiber,
FIG. 9 is a drawing-substitute photograph showing the shape of the leather fiber of the present invention before classification, and FIG. 10 is a drawing-substitute photograph showing the shape of the leather fiber of the present invention. In the figure, 1 ... processing chamber, 2 ... valve, 3 ... stirring means, 4 ...
Jacket, 5 ... Valve, 11 ... Feeder, 12 ... Air classifier, 13 ... Turbo fan, 14 ... Back filter tank, 20 ... Seat, 21 ... Coating head, 22
…… Film, 23 …… Dryer.

Claims (1)

(57) [Claims] 1. A molded article formed by applying a synthetic resin film having a thickness of 0.01 to 0.1 mm, wherein the film of the molded article has leather powder and the leather powder contained in the film has an apparent specific gravity. 0.38 to 0.50 g / cc, containing less than 3% by weight of water, and more than 70% by weight of leather powder with a particle size of 40 microns or less 40
A molded article having a leather-like surface layer, characterized by being a leather powder of mesh sieve selection.