KR102327305B1 - A method for manufacturing integral skin foam console armrest - Google Patents

Abstract

The present invention relates to a method for manufacturing a skin foam-integrated armrest in which a base made of a plastic material and an elastic body in which the skin and foam are integrally molded by foam molding of PU material are stacked integrally in a state of wrapping substrate. As described above, according to the present invention, there is an effect of reducing the cost by simplifying a process, solving the problems caused by skin contact by using an eco-friendly material and an antibacterial material, and applying and using the skin foam-integrated armrest for various purposes.

Description

A method for manufacturing a skin foam-integrated armrest {A METHOD FOR MANUFACTURING INTEGRAL SKIN FOAM CONSOLE ARMREST}

The present invention relates to a method for manufacturing a skin-form-integrated armrest in which a base made of a plastic material and a foam-molded PU material are formed, and an elastic body in which a skin and a foam are integrally molded is integrally laminated while enclosing the base material.

An instrument panel for automobiles is a kind of decorative pad that includes the side where the instrument panel, airbag, glove box, etc. are installed in front of the driver's and front passenger's seats. It is manufactured by the Powder Slush Molding (PSM) process.

In the powder slush molding process, the powder for skin material production is put in a powder supply box, and a heated mold is fastened thereon and then rotated, so that the powder in contact with the heated mold is melted and at the same time a sheet having the shape of the mold surface is manufactured with

In addition, in addition to these instrument panels, the surfaces of various parts used as interior materials for automobiles such as floor consoles, door trims, or armrests provide a luxurious image to the interior of the vehicle and at the same time , various skin materials, aka skin materials, are used to provide a more comfortable atmosphere to the occupant by giving a soft touch to the part where the occupant's physical contact is expected.

As described above, the skin material applied to the interior parts for automobiles can be classified into a sheet material for the vacuum forming method and a powder material for the PSM method. However, compared to the vacuum forming method, it can provide a softer feel and clear embossing, so it is applied to high-end car models.

And, in the case of the sheet-like material used in the vacuum forming method, blending of acrylonitrile-butadiene-styrene copolymer (aka, ABS resin) with vinyl chloride resin (PVC) is widely applied, and recently As a recyclable and eco-friendly material, propylene-based thermoplastic polyolefin (TPO) material is starting to be applied, and its frequency is increasing.

In addition, in the case of the powdery material used in the PSM method, polyvinyl chloride (PVC) as a base and polyvinyl chloride powder (PVC Powder) in which a plasticizer and various additives are compounded is the mainstream, and in some cases, propylene A powdery material of thermoplastic polyolefin (TPO) having elasticity as a base is being developed as a material for the PSM method.

In relation to this technology, the prior art Patent Publication No. 2019-63737 discloses a technology of an automobile interior material, and the configuration is to improve the adhesion between the thermoplastic polyolefin (TPO) base layer and the polyurethane foam layer, as shown in FIG. 1 . adhesive is used

In this case, as the adhesive, an eco-friendly adhesive that minimizes the generation of volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) is used.

And, by using the eco-friendly adhesive to adhere a thermoplastic polyolefin (TPO) base layer and a polyurethane foam layer (PU Form) laminated on the upper side of the core to manufacture an automobile interior material.

However, the automobile interior material as described above has disadvantages in that the cost increases due to the increase in the process because the foam insect and the skin must be attached with an adhesive, and the use of the adhesive harms the environment, such as volatile organic compounds.

An object of the present invention to improve the conventional problems as described above is to simplify the process to reduce the cost, to suppress the generation of environmental hormones, etc. because there is no need to use a bond, and an eco-friendly material and an antibacterial material An object of the present invention is to provide a method for manufacturing a skin-form-integrated armrest that can be used to solve problems caused by skin contact, and can be applied and used for various purposes.

The present invention attaches a base material made of a plastic material to an upper mold in order to achieve the above object,

A skin-form-integrated armrest that manufactures a skin-form-integrated armrest by injecting a foam made of a TPU material elastomer mixture into the lower mold and then foaming it to form an integrally formed skin and foam, and the elastomer mixture is integrally laminated to cover the base material A manufacturing method is provided.

In addition, the elastomer mixture is made of a combination of 70% TPU (Thermoplastic Polyurethane) and 30% 1-butyne, and provides a method of manufacturing a skin foam-integrated armrest that satisfies a shore hardness of “C” type 50 to 65.

In addition, the elastomer mixture further includes a foaming agent composed of boric acid and/or its esters in TPU, and the molding density during molding of the skin is 35-50 kgf/cm ² To have a tensile strength of 500-2000 ppm silver nano It provides a method for manufacturing an integrated skin foam armrest in which the antibacterial agent is further included in the range of 1 to 3% by weight compared to TPU (base resin).

Subsequently, the lower mold is further provided with a stitch groove and a skin dividing groove for forming a stitch, and a cooling hole is provided integrally along the skin and is separated from the cooling hole and further provided with a cooling concentration hole corresponding to the stitch groove. Provided is a method for manufacturing a skin-form-integrated armrest.

In addition, the lower mold provides a method for manufacturing a skin-form-integrated armrest in which the pressure is removed through an instantaneous opening operation to expand by 120 to 160%, and a cooling hole close to the skin is further provided.

As described above, according to the present invention, the cost is reduced by simplifying the process, the generation of environmental hormones is suppressed because there is no need to use a bond, and the problem caused by skin contact is solved by using an eco-friendly material and an antibacterial material, and various uses It has the effect of applying it as

1 is a perspective view showing a conventional automobile interior material.
2 is a perspective view showing an armrest according to the present invention.
Figure 3 is a side view showing the armrest manufacturing process according to the present invention.
4 is a side view illustrating an armrest manufacturing process according to another embodiment of the present invention.
5 is a side view illustrating an armrest manufacturing process according to another embodiment of the present invention.
6 is a flowchart illustrating an armrest manufacturing process according to another embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail based on the accompanying drawings.

The armrest 100 of the present invention is TPU (Thermoplastic Polyurethane) in which the skin 151 and the foaming layer 153 are integrally molded on the upper portion of the base material 130 made of a plastic material located on one side of the inner cover 110. ) material of the elastic body 150 is laminated.

At this time, the elastic body 150 is formed integrally with the skin and the foaming layer when the TPU material is foamed.

In addition, the plastic material is preferably made of a PC (Polycarbonate) or ABS (Acrylonitrile Butadiene Styrene) material.

In addition, the substrate 130 is separately manufactured through the substrate upper mold 130a and the substrate lower mold 130b.

At this time, the substrate 130 is formed such that the concave-convex portions 139 formed of protrusions or grooves are integrally formed on the surface thereof to widen the contact area.

And, the concave-convex portion 139 is integrally formed by the concave-convex portion formed in the base mold 130b, as shown in FIG.

On the other hand, the base material 130 is not integrally formed with the elastic body 150, but the base material and the elastic body are separately formed, and the base material and the elastic body 150 are formed with a fixing pin through the Takagi 300 as shown in FIG. 301) may be wrapped around.

At this time, an uneven portion (not shown) is further integrally formed on the outer surface of the foam layer 153 constituting the elastic body 150, and the elastic body laminated on the surface and the upper side of the base material when the elastic body and the base material are laminated and assembled ( 150) is provided with concave-convex portions 139 corresponding to each other on the inner surface to suppress the lifting phenomenon of the contact surface, and is installed to enable firm adhesion.

And, the configuration of laminating the elastic body 150 on the upper side of the base 130 of the present invention is manufactured by foam molding by a pair of upper mold 210 and lower mold 230 molded to have the outer shape of the armrest. .

First, a base material 130 made of a plastic material is attached to the inside of the upper mold 210 that is opened as a method for manufacturing the armrest.

At this time, the substrate 130 is first manufactured by injection molding.

Subsequently, the elastomer mixture 750 made of TPU is injected into the inner side of the lower mold 230 by the injector 700 and then foamed.

At this time, the elastomer mixture is formed by mixing a foaming agent by chemical, cross-linking, and pressurized foaming methods ^{, pressurized and heated at a pressure of 120 to 150 kg/cm 2} and a temperature of 180 to 250 ° C.

In addition, the TPU (Thermoplastic Polyurethane) forming the elastomer mixture 750 is manufactured by polymerizing an aliphatic series as a base.

At this time, the elastomer mixture is made of a configuration in which 70% of TPU and 30% of 1-butyne are further mixed, while satisfying the hardness of 50-65 Shore hardness "C" type when foaming.

In addition, the elastomer mixture 750 further includes a blowing agent made of boric acid and/or esters thereof.

At this time, the elastomer mixture is made to have a tensile strength of ^{35-50 kgf/cm 2 .}

In addition, the elastomer mixture, 500 to 2000ppm of the silver nano antibacterial agent is further included in the range of 1 to 3% by weight compared to TPU.

Subsequently, the lower mold 230 is further provided with a stitch groove 510 and a skin dividing groove 530 for forming the stitch 590 and the connection groove 595 of the skin 151 .

At this time, the cooling hole 310 is integrally provided along the skin or stitch groove.

In addition, a cooling concentration hole 315 corresponding to the stitch groove is further provided separately from the cooling hole 310 .

That is, the cooling hole and the cooling concentrating hole have a difference in diameter, so that the density of the elastomer mixture is higher at the cooling concentrating hole side.

On the other hand, the lower mold 230 may be formed by foam molding in a configuration in close contact with the upper mold, but 120 to 160 by forming a pressure relief hole H1 through an instantaneous opening operation as shown in FIG. 3 to remove the pressure. It may be expanded by %.

In addition, a plurality of cooling holes 310 are provided along the lower mold at a position close to the skin 151 as shown in FIG. 4 .

A method for manufacturing an armrest of the present invention having the configuration as described above will be described.

2 to 6, the elastomer mixture of the present invention uses TPU, which is a thermoplastic elastomer.

At this time, the TPU is a polyurethane-based thermoplastic elastomer, and is widely applied to applications requiring high durability as a material having the best mechanical properties such as tensile strength, tear strength, and abrasion resistance among thermoplastic elastomers.

In addition, the TPU has excellent optical properties such as high transparency and gloss, and excellent chemical resistance such as hydrolysis resistance, oil resistance, and fuel resistance.

And, the elastic body 150 made of the TPU material of the present invention has a configuration in which the skin and the foam layer are integrally molded during foam molding without the need for a configuration for bonding the conventional skin and the foam layer with a separate adhesive. To solve the problem of the generation of environmental hormones and the increase in the process due to the use of adhesives.

In addition, in the present invention, the elastomer mixture 750 is made of a combination of 70% TPU and 30% 1-butyne, and has a laminated structure of a conventional PVC skin and foam layer. "You have to satisfy your brother 50-65.

And, the configuration in which the elastic body 150 is laminated on the upper side of the substrate 130 of the present invention is a configuration in which the elastic body is foam-molded on one side of the substrate to be integrally laminated, or the substrate and the elastic body are separately manufactured as shown in FIG. By wrapping the substrate, it may be laminated and bonded integrally through the takagi 300 .

In addition, when the base material 130 and the elastic body 150 are integrally molded, the armrest is manufactured by a pair of an upper mold 210 and a lower mold 230 that are molded to have the outer shape of the armrest.

That is, after attaching the base material 130 made of a plastic material (preferably PC or ABS) to the inside of the upper mold 210 to be opened, the elastic mixture 750 made of TPU to the inside of the lower mold 230 is added. By injecting with the injector 700, the upper and lower molds are closely adhered to each other, and the upper and lower molds are ^{pressed and heated at a pressure of 120 to 150 kg/cm 2} and a temperature of 180 to 250 ° C, which is the foaming condition of the urethane, to form. do.

In this case, the elastic body is foam-molded by mixing a foaming agent in a chemical, cross-linking, and pressurized foaming method.

In addition, it was found through repeated tests that the elastomer mixture 750 preferably further contains a blowing agent made of boric acid and/or esters thereof for foam molding.

The elastic body manufactured through this method has a conventional laminated structure of PVC skin and foam layer, and has a tensile strength of ^{35-50 kgf/cm 2 which is the same as or corresponding to the armrest.}

In addition, in the elastic body, 500 to 2000 ppm of silver nano antibacterial agent was further included in the range of 1 to 3 wt % compared to TPU, and when the antibacterial agent was 1 wt % or less, the antibacterial properties were lowered, and when 3 wt % or more was added, the cost increased. Of course, this will lead to a decrease in overall physical properties.

Subsequently, the lower mold 230 is further provided with a stitch groove 510 and a skin dividing groove 530 for forming the stitch 590 and the connection groove 595 of the skin 151, so that the skin of the armrest is attached to the skin of the armrest. Stitches are formed integrally.

At this time, the cooling hole 310 is integrally provided along the skin or stitch groove, so that the density of the skin can be adjusted by cooling the forming part of the skin when cooling water is supplied, so that the skin having a uniform density can be formed.

In addition, a cooling concentration hole 315 corresponding to the stitch groove is further provided separately from the cooling hole 310 to form a stitch having a density different from that of the skin, thereby realizing a real stitch distinguished from the skin. .

On the other hand, as shown in FIG. 3, the density of the skin can be controlled by forming the pressure relief hole H1 through an instantaneous opening operation to remove the pressure.

At this time, the degree of opening of the mold for forming the pressure relief hole was confirmed through repeated experiments that it is desirable to allow the elastic body to expand by 120 to 160% of the injection amount as a whole.

That is, it became possible to realize the desired hardness and tensile strength of the skin in the armrest under the 120-160% expansion condition as described above.

On the other hand, as shown in FIG. 6 , the substrate 130 is not molded integrally with the elastic body 150 , but the substrate and the elastic body are separately molded.

Then, the base material and the elastic body 150 are wrapped and combined as a fixing pin 301 through the Takagi 300 to complete the armrest.

At this time, a stitch 590 and a connection groove 595 are integrally formed on the skin 151, which is the surface of the elastic body, in the same manner as described above, so that a real stitch can be realized on the surface of the armrest.

In addition, the substrate 130 has a concave-convex portion 139 integrally formed on its upper surface to widen the contact area during foaming of the elastic body 150 on the upper surface to enable a strong close bond, thereby avoiding the problem of peeling without an adhesive. make it resolved

On the other hand, an uneven portion (not shown) is further integrally formed on the outer surface of the foam layer 153 constituting the elastic body 150, so that the elastic body 150 is laminated on the surface and the upper side of the base material when the elastic body and the base are laminated and assembled. Concave and convex portions 139 corresponding to each other are provided on the inner surface of the to suppress the lifting phenomenon of the contact surface, so that a firm adhesion is possible and vibration caused by the lifting is suppressed.

110...Inner cover 130...Remarks
151...skin 153...foam layer
210...Price type 230...Lower metal type
590...stitch 595...connection groove
700...Injector

Claims (5)

base material made of plastic and
The skin and foam are integrally formed by foam molding of an elastic mixture made of TPU material, and the skin and foam are integrally laminated in a state of enveloping the substrate to manufacture a skin foam-integrated armrest,
The armrest is made of a skin foam-integrated armrest in a configuration in which a base made of a plastic material is injected into the upper mold and an elastic mixture made of TPU is injected into the lower mold, and the elastomer mixture is integrally laminated on one side of the base. ,
The base material and the foam layer of the elastic body are in close contact with the uneven portion,
The lower mold is further provided with a stitch groove and a skin dividing groove so that the stitch is integrally formed on the skin,
The cooling hole is integrally provided along the skin, and a cooling concentration hole having a diameter difference from the cooling hole is further provided so as to be separated from the cooling hole and correspond to the stitch groove, so that the density of the skin and the stitch is different,
The skin form-integrated armrest manufacturing method in which the lower mold expands to 120 to 160% by removing pressure through an instantaneous opening operation. delete The method of claim 1, wherein the armrest is formed after each of the base material and the elastic body are molded.
By combining the elastic body with Takagi's fixing pin in a state of enveloping the substrate, a skin-form-integrated armrest is manufactured,
A method for manufacturing a skin-form-integrated armrest, characterized in that the concave-convex portions corresponding to the corresponding surfaces of the base material and the elastic body are integrally provided. According to claim 1, wherein the elastomer mixture,
a) TPU further contains a blowing agent consisting of boric acid and / or its esters,
b) 500-2000 ppm of silver nano antibacterial agent is contained in TPU by 1-3 wt% more than TPU,
c) TPU and 1-butyne 70%:30% combined,
A method for manufacturing an integrated skin foam armrest, characterized in that it has a tensile strength of 35-50 kgf/cm ^{2 during foaming and satisfies a shore hardness of "C" type 50-65.} delete

Images