KR20080027656A - Internal panel for car and the manufacturing method of the same - Google Patents

Abstract

An interior panel for a vehicle and a manufacturing method for the same are provided to improve durability due to strong tensile force and strength by making a base material of a thin sheet produced by weaving fibers in a grid form. An interior panel(10) for a vehicle has a triple-layered structure. The triple-layered structure is composed of: a cushioning material(11) made of EPP(Expanded Polypropylene) foam and a pair of base materials(13,13a) stacked on the upper and lower sides of the cushioning material. The base material is a thin sheet formed by weaving PP(Polypropylene) fibers in a grid form. An interior panel manufacturing method comprises the steps of: inserting a pair of base materials into a lower preheating press and preheating the base materials by pressing an upper preheating press at pressure of 30~100 tons; stacking the cushioning material between the preheated base materials and then transferring the stacked materials to a mold; and molding the materials for 1~2 minutes by pressing the upper mold at pressure of 1~3kg/cm^2 until temperature of the materials transferred to the mold reaches 25~35‹C.

Description

Internal panel for car and the manufacturing method of the same

1 is a cross-sectional view showing a vehicle interior panel according to a first embodiment of the present invention.

FIG. 2 is a process diagram illustrating a method of manufacturing the automotive interior panel of FIG. 1. FIG.

3 is a flowchart illustrating a method of manufacturing the interior panel of the automobile of FIG. 1.

Figure 4 is a cross-sectional view showing a vehicle interior panel according to a second embodiment of the present invention.

5 is a cross-sectional view showing a vehicle interior panel according to a third embodiment of the present invention.

6 is a cross-sectional view showing a vehicle interior panel according to a fourth embodiment of the present invention.

7 is a cross-sectional view showing a vehicle interior panel according to a fifth embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10, 20, 30, 40, 50: interior panel 11, 21, 31, 41, 51: cushion material

13, 13a, 23, 23a, 33: substrate 33a, 43, 43a, 53, 53a: substrate

100, 110: preheat press 200, 210: molding mold

200a, 200b, 210a, 210b: air discharge nozzle

The present invention relates to a vehicle interior panel and a method of manufacturing the same.

In general, interior materials such as automotive panel, instrument panel, door trim panel, and package panel are composed of hard base material and soft skin paper, and the base material is mainly polypropylene (PP: polypropylene), polyethylene (PE: polyethylene) , ABS, wood fiber, wood stock, resin felt, etc. in the mat (mat) state, the skin is polyvinyl chloride (PVC: polyvinylchloride) film or polyethylene PE foam or nonwoven fabric is laminated on the mat.

In the process of manufacturing such interior materials, the resin felt is first formed in a mat or panel state, inserted between upper and lower molding molds, and then pressurized to complete molding. The molded product is trimmed or punched using a molding die. To make the product in the pad state. After attaching a skin material such as a nonwoven fabric to the pad-shaped product manufactured as described above, the manufacturing of the interior panel of the automobile is completed through a piercing mold.

However, such a conventional interior panel is harmful to the worker because it uses a particle-type spray using a bond containing toxic chemicals such as toluene to attach the skin to the pad, and also resin resin and wood fiber, etc. Since phenol resin is used as the thermosetting resin binder, it is harmful to the human body by toxic gas emission during thermoforming and causes environmental pollution, and has a weak strength while forming a thick thickness.

The present invention has been made to solve the above-mentioned problems, and can provide a strong tensile force and a strong rigidity to improve the durability, the processability is good to provide a vehicle interior panel and a manufacturing method thereof can be improved production efficiency The purpose is.

Automotive interior panel of the present invention for achieving the above object is a cushioning material made of foamed polypropylene (EPP) foam material; And a pair of substrates laminated on top and bottom of the cushioning material, respectively, consisting of a three-layer structure, wherein the substrate is characterized in that a thin sheet made by weaving polypropylene (PP) fibers in a lattice shape.

In addition, in order to achieve the above object, a method for manufacturing an automotive interior panel of the present invention includes: (1) a pair of substrates made of thin sheets made of woven polypropylene (PP) fibers in a lattice shape on a lower preheating press, respectively. Inserting, pressing the preheating press to preheat at a pressure of 30 ~ 100ton for preheating 1 to 2 minutes; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) press molding the upper molding mold by pressing at a pressure of 1 ~ 3kg / ㎠ until the temperature of the material transferred to the molding mold is 25 ~ 35 ℃ 1 to 2 minutes molding; includes.

Car interior panel according to another aspect of the invention, the cushioning material made of foam polypropylene (EPP) foam material; And a pair of substrates laminated on top and bottom of the cushioning material, respectively; consisting of a three-layer structure, wherein the substrate is made of polypropylene (PP) in a sheet made by weaving a glass fiber of 60 wt% to 75 wt% in a lattice shape. 25 to 40% by weight is characterized in that the coating.

In addition, the automotive interior panel manufacturing method of the present invention for achieving the above object, (1) from 25% by weight of polypropylene (PP) to a sheet made by weaving a glass fiber 60% to 75% by weight in a lattice shape A crimping preheating step of inserting a pair of substrates coated with 40% by weight into the lower preheating press and pressing the upper preheating press at a pressure of 30 to 100 tons for 1 to 2 minutes; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C .; It is done.

Car interior panel according to another aspect of the invention, the cushioning material made of foam polypropylene (EPP) foam material; And a pair of substrates laminated on top and bottom of the cushioning material, respectively, wherein the substrate is composed of 45% by weight to 55% by weight of polypropylene (PP) fiber, including hemp, hemp, flax, jute, and ramie grass. The polyethylene terephthalate (PET) layer is laminated on top and bottom of the sheet prepared by mixing with 45% by weight to 55% by weight of one kind of natural fibers selected from the fibers.

In addition, in order to achieve the above object, a method for manufacturing an automotive interior panel of the present invention includes (1) 45% by weight to 55% by weight of polypropylene (PP) fiber selected from sheep, hemp, flax, jute and ramie grass. A pair of substrates each having a polyethylene terephthalate (PET) layer laminated on top and bottom of the sheet prepared by mixing 45% to 55% by weight of the natural fiber of the species is respectively inserted into the lower preheat press, and the upper preheat press Compression preheating step of preheating for 1 to 2 minutes by pressing at a pressure of 30 ~ 100ton; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C .; It is done.

Car interior panel according to another aspect of the invention, the cushioning material made of foam polypropylene (EPP) foam material; And a pair of substrates laminated on top and bottom of the cushioning material, respectively. The three-layer structure includes a mixture of 70 wt% polyethylene terephthalate (PET) and 30 wt% low melting point polyethylene terephthalate (PET). It is characterized in that the manufacturing.

In addition, the automotive interior panel manufacturing method of the present invention for achieving the above object is (1) as long as it is prepared by mixing 70% by weight of polyethylene terephthalate (PET) and 30% by weight of low melting point polyethylene terephthalate (PET). A crimping preheating step of inserting a pair of substrates into the lower preheating press and pressing the upper preheating press at a pressure of 30 to 100tons to preheat 1 to 2 minutes; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 and molding the mold for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C.

Car interior panel according to another aspect of the invention, the cushioning material made of foam polypropylene (EPP) foam material; And a pair of substrates laminated on top and bottom of the cushioning material, respectively, consisting of a three-layer structure, wherein the substrate is prepared by mixing 50% by weight of glass fiber and 50% by weight of polypropylene (PP). .

In addition, in order to achieve the above object, a method for manufacturing a vehicle interior panel of the present invention includes (1) a preheating press of a pair of substrates prepared by mixing 50% by weight of glass fiber and 50% by weight of polypropylene (PP). Inserting into each, pressing the preheating press to preheat at a pressure of 30 ~ 100ton for preheating 1 to 2 minutes; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 and molding the mold for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a vehicle interior panel according to a first embodiment of the present invention.

As shown in Fig. 1, the automotive interior panel of the first embodiment has a three-layer structure composed of a cushion member 11 and a pair of base materials 13 and 13a.

The cushion member 11 is made of a foamed polypropylene (EPP) foam material.

In order to manufacture the foamed polypropylene foam, the foamed polypropylene is sufficiently softened by using saturated steam, which is a fruit entity, and the expanded polypropylene is expanded to bead, and the foamed polypropylene is foamed and aged for a certain time. After that, the foam lip is filled into a mold capable of obtaining a plate-shaped, block-shaped or cylindrical product, and steam is applied to the foam lip particles by swelling of the foam lip by expansion of the foaming agent and air in the foam lip to separate from the mold. The molded polypropylene foam is molded to maintain the shape of the mold, and the expanded polypropylene foam molded as described above is cut into a plate or sheet state using a band saw, a knife or a heating wire, thereby completing the expanded polypropylene foam.

A pair of base materials 13 and 13a are laminated on the upper and lower sides of the cushioning material 11, respectively. In the first embodiment, the base materials 13 and 13a are thin sheets made by weaving polypropylene (PP) fibers in a lattice shape. It is composed.

When the polypropylene fiber is woven into a lattice shape to make a thin sheet, it can have a stronger tensile force than the general polypropylene sheet.

Hereinafter, the manufacturing method of the automotive interior panel 10 according to the first embodiment having the above-described configuration is as follows.

The manufacturing method of the automotive interior panel 10 according to the first embodiment, as shown in Figs. 2 and 3, the compression preheating step, the transfer lamination step and the pressing molding step.

(1) In the crimping preheating step, as shown in (1) of FIG. 2, first, the pair of base materials 13 and 13a made of a thin sheet made by weaving polypropylene fibers in a lattice shape is lowered in the preheating press 110. ), Respectively, and the upper preheat press 100 is pressed to a pressure of 30 ~ 100ton to preheat 1 to 2 minutes.

At this time, the preheating presses 100 and 110 maintain a temperature of 190 to 210 ° C., and the thicknesses of the substrates 13 and 13a before pressurizing preheating are maintained at 10 to 20 mm, and after the pressurizing preheating process, 2 mm is used. This is because the polypropylene fibers of the substrates 13 and 13a are easily transformed by heat transfer from the preheating presses 100 and 110 as thermoplastic materials.

In addition, the substrates 13 and 13a which are pressed and preheated in the crimping preheating step have a plate shape of 150 × 200 cm, and the pressing force is 30 to 100 tons relative to the total area. The design criteria at the stage are based on the pressure received per unit area of 2kg / cm3. When designing the pressure of 2kg / cm3 per unit area, 60ton pressure is required for the total area. Press at a pressure of ~ 100 tons.

In addition, when the temperature of the preheating presses 100 and 110 is 165 ° C. or less, the molding is not performed properly in the compression molding step. In the range of 166 to 190 ° C., the fluff smell of natural fibers occurs, and when the temperature is 245 ° C. or more, the poly Propylene fibers cause changes in physical properties and cannot be molded for the intended product. In the range of 200 ~ 244 ℃, natural fibers burn badly and burnt in the range of 190 ~ 210 ℃ to obtain good quality products. It is preferable to crimp preheat.

(2) In the transfer lamination step, as shown in (2) of FIG. 2, a cushion member 11 made of expanded polypropylene (EPP) foam material is positioned between the preheated pair of substrates 13 and 13a. Laminated to transfer to the molding mold (200, 210).

In this process, since the substrates 13 and 13a are flexible plates, deformation may occur, thus requiring attention to the transfer process, and thus preheating presses 100 and 110 in the crimping preheating step so that the substrates 13 and 13a do not have excessive flexibility. It is preferable to maintain the temperature of () to 190 ~ 210 ℃.

(3) In the pressing molding step, as shown in (3) of FIG. 2, the upper molding mold 200 is opened until the temperature of the material transferred to the molding molds 200 and 210 becomes 25 to 35 ° C. When pressed at a pressure of 1 to 3 kg / cm 2 and molded for 1 to 2 minutes, the manufacturing of the automotive interior panel 10 is completed.

In the pressing molding step, a plurality of cooling water pipes are formed in the molding molds 200 and 210 so that the cooling water is circulated. In this case, the substrates 13 and 13a, which are thermoplastic materials, are melted through the pressing preheating step, and the molding molds 200 and 210 It is cured by cooling water circulated into the C), so that the polypropylene fibers in the substrate 13, 13a are bonded to the foamed polypropylene foam while the substrates 13, 13a are brought into contact with each other up and down the foamed polypropylene foam. In this process, the air discharge nozzles 200a, 200b, 210a, and 210b are formed in the upper and lower molding molds 200 and 210 to eject the air present inside the mold during the compression molding, and thus It is made by crimping for 1 to 2 minutes until the temperature of the base materials 13 and 13a becomes 25-35 degreeC, preventing a defect from generate | occur | producing.

Meanwhile, a configuration of a vehicle interior panel according to another embodiment will be described, and a method of manufacturing the interior panel of a vehicle according to another embodiment is the same as the method of manufacturing the interior panel of a vehicle according to the first embodiment described above. Therefore, the description of the manufacturing method will be omitted below.

As shown in FIG. 4, the automotive interior panel 20 of the second embodiment has a three-layer structure composed of a cushion material 21 and a pair of base materials 23 and 23a.

The cushion member 21 is made of a foamed polypropylene (EPP) foam material.

A pair of base materials 23 and 23a are laminated on the upper and lower sides of the cushioning material 21, respectively, and the base materials 23 and 23a are polypropylene in a sheet made by weaving 60 wt% to 75 wt% of glass fibers in a lattice shape. (PP) 25% to 40% by weight is coated, and these substrates 23 and 23a have very strong stiffness after processing.

As shown in FIG. 5, the automotive interior panel 30 of the third embodiment has a three-layer structure composed of a cushion member 31 and a pair of base materials 31 and 31a.

The cushion member 31 is made of a foamed polypropylene (EPP) foam material.

The pair of substrates 31 and 31a are laminated on the upper and lower portions of the cushioning material 31, respectively, and the substrates 31 and 31a are made of 45% by weight to 55% by weight of polypropylene (PP) fibers such as hemp, hemp, flax and jute. Polyethylene terephthalate (PET) layers are laminated on top and bottom of the sheet prepared by mixing with 45% by weight to 55% by weight of one type of natural fiber selected from ramie grass fiber.

Looking at the manufacturing process of the sheet in detail, the sheet is first mixed with 45 to 55% by weight of polypropylene fiber and 45 to 55% by weight of a natural fiber prepared by cutting to a length of 70 ~ 90mm, the other side of the mixed fiber It is manufactured by cutting the mat produced through the opening operation, the carding operation of stacking the fibers coming from other layers, and the needle operation of joining the multilayered fibers using a needling machine. As the natural fiber, one type of natural fiber may be selected from among hemp, hemp, flax, jute, and ramie fiber, and preferably, strength and durability, and abundant natural fiber are used.

Polypropylene fiber is melted when forming the substrate, and serves to bind the natural fibers and impart moldability of the embedded substrate. Natural fibers are responsible for the strength, stiffness and impact resistance of the embedded substrate. The higher this, the higher the strength and rigidity, but the poor formability.

As shown in FIG. 6, the automotive interior panel 40 of the fourth embodiment has a three-layer structure composed of a cushion material 41 and a pair of base materials 43 and 43a.

The cushion material 41 is made of foamed polypropylene (EPP) foam material.

A pair of base materials 43 and 43a are laminated on the upper and lower portions of the cushioning material 41, respectively, and the base materials 43 and 43a are 70 wt% polyethylene terephthalate (PET) and 30 wt% low melting point polyethylene terephthalate (PET). It is prepared by mixing, the base material (43, 43a) is good workability.

As shown in Fig. 7, the automotive interior panel 50 of the fifth embodiment has a three-layer structure composed of a cushion material 51 and a pair of base materials 53 and 53a.

The cushion material 51 is made of a foamed polypropylene (EPP) foam material.

A pair of base materials 53 and 53a are laminated on top and bottom of the cushioning material 51, respectively, and the base materials 53 and 53a are manufactured by mixing 50 weight% of glass fiber and 50 weight% of polypropylene (PP).

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art various modifications of the present invention without departing from the spirit and scope of the invention described in the claims below. Or it may be modified.

According to the automotive interior panel and the manufacturing method of the present invention as described above, there are the following effects.

It consists of a cushioning material made of foamed polypropylene foam and a pair of base materials laminated on the upper and lower sides of the cushioning material. The base material is composed of a thin sheet made of woven polypropylene fibers in a lattice shape. Tensile strength and strong rigidity can be improved, durability is improved, and workability can be improved, and production efficiency can be improved.

Claims (10)

Cushioning material made of expanded polypropylene (EPP) foam material; And Consists of a three-layer structure consisting of; a pair of base materials respectively laminated on top and bottom of the cushion material, The substrate is a vehicle interior panel, characterized in that the thin sheet made by weaving polypropylene (PP) fibers in a grid. (1) A pair of thin sheets made of woven polypropylene (PP) fibers are inserted into the lower preheating press, and the upper preheating press is pressed at a pressure of 30 to 100 tons and preheated for 1 to 2 minutes. A compression preheating step; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C .; Automotive interior panel manufacturing method. Cushioning material made of expanded polypropylene (EPP) foam material; And Consists of a three-layer structure consisting of; a pair of base materials respectively laminated on top and bottom of the cushion material, The substrate is automotive interior panel, characterized in that 25 to 40% by weight of polypropylene (PP) is coated on a sheet made by weaving a glass fiber 60% to 75% by weight in a lattice shape. (1) A pair of substrates coated with polypropylene (PP) 25% by weight to 40% by weight in sheets made by lattice woven from 60% by weight to 75% by weight of glass fibers were respectively inserted into the lower preheating press, A compression preheating step of preheating the preheating press at a pressure of 30 to 100 tons for 1 to 2 minutes; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C .; Automotive interior panel manufacturing method. Cushioning material made of expanded polypropylene (EPP) foam material; And Consists of a three-layer structure consisting of; a pair of base materials respectively laminated on top and bottom of the cushion material, The substrate may be prepared by mixing 45 wt% to 55 wt% of polypropylene (PP) fiber with 45 wt% to 55 wt% of a natural fiber selected from one of hemp, hemp, flax, jute, and ramie grass fibers, An interior panel for automobiles, characterized in that a polyethylene terephthalate (PET) layer is laminated under each. (1) 45 wt% to 55 wt% of polypropylene (PP) fiber mixed with 45 wt% to 55 wt% of one kind of natural fiber selected from hemp, hemp, flax, jute and ramie grass fibers; A crimping preheating step of inserting a pair of substrates each having a polyethylene terephthalate (PET) layer stacked thereon into a lower preheating press, pressing the upper preheating press at a pressure of 30 to 100tons, and preheating 1 to 2 minutes; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C .; Automotive interior panel manufacturing method. Cushioning material made of expanded polypropylene (EPP) foam material; And Consists of a three-layer structure consisting of; a pair of base materials respectively laminated on top and bottom of the cushion material, The substrate is a vehicle interior panel, characterized in that manufactured by mixing 70% by weight of polyethylene terephthalate (PET) and 30% by weight of low melting polyethylene terephthalate (PET). (1) A pair of substrates prepared by mixing 70% by weight of polyethylene terephthalate (PET) and 30% by weight of low melting polyethylene terephthalate (PET) is respectively inserted into the lower preheating press, and the upper preheating press of 30 to 100ton Compression preheating step of preheating for 1 to 2 minutes by pressing with pressure; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C .; Automotive interior panel manufacturing method. Cushioning material made of expanded polypropylene (EPP) foam material; And Consists of a three-layer structure consisting of; a pair of base materials respectively laminated on top and bottom of the cushion material, The substrate is a vehicle interior panel, characterized in that manufactured by mixing 50% by weight of glass fiber and 50% by weight of polypropylene (PP). (1) A pair of substrates prepared by mixing 50% by weight of glass fiber and 50% by weight of polypropylene (PP) are respectively inserted into the lower preheating press, and the upper preheating press is pressed at a pressure of 30 to 100 tons to 1 to 2 Compression preheating step of preheating for minutes; (2) a transfer lamination step of laminating a cushion member made of a foamed polypropylene (EPP) foam material between the preheated pair of substrates to transfer the mold to a molding mold; (3) a compression molding step of pressing the upper molding mold at a pressure of 1 to 3kg / cm 2 for 1 to 2 minutes until the temperature of the material transferred to the molding mold is 25 to 35 ° C .; Automotive interior panel manufacturing method.

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