KR20170014074A - Method for manufacturing under cover for vehicle using glass fibrous reinforcing sheet - Google Patents

Method for manufacturing under cover for vehicle using glass fibrous reinforcing sheet Download PDF

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Publication number
KR20170014074A
KR20170014074A KR1020150106696A KR20150106696A KR20170014074A KR 20170014074 A KR20170014074 A KR 20170014074A KR 1020150106696 A KR1020150106696 A KR 1020150106696A KR 20150106696 A KR20150106696 A KR 20150106696A KR 20170014074 A KR20170014074 A KR 20170014074A
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KR
South Korea
Prior art keywords
glass fiber
reinforced composite
composite sheet
sheet
fiber reinforced
Prior art date
Application number
KR1020150106696A
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Korean (ko)
Inventor
이진세
정동성
Original Assignee
주식회사 세운
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Priority to KR1020150106696A priority Critical patent/KR20170014074A/en
Publication of KR20170014074A publication Critical patent/KR20170014074A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/002—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor characterised by the choice of material
    • B29C51/004—Textile or other fibrous material made from plastics fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
    • B29C51/145—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets having at least one layer of textile or fibrous material combined with at least one plastics layer

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Moulding By Coating Moulds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The present invention relates to a method for manufacturing a vehicle under-cover using a glass fiber-reinforced composite sheet, and more particularly, to a method for manufacturing a glass fiber-reinforced composite sheet by cutting a glass fiber into a predetermined size, Forming a glass fiber reinforced composite sheet by thermocompression bonding and cooling the glass fiber pellets in which the polypropylene sheet is laminated, and forming a glass fiber reinforced composite sheet on the glass fiber pellets, And a step of laminating nonwoven fabrics on both sides of the glass fiber reinforced composite sheet, and thermocompression and cold forming of the glass fiber reinforced composite sheet in which the nonwoven fabric is laminated to form an under cover molding.
According to the present invention as described above, the polypropylene sheet can be thermally compressed on both sides of the glass fiber pellets to improve the rigidity. The nonwoven fabric can be thermally pressed on the outer surface of the polypropylene sheet, It can be produced through a continuous process, thereby shortening the production time of the product and reducing the manufacturing cost.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for manufacturing a vehicle under-cover using a glass fiber reinforced composite sheet,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an under cover for a vehicle using a glass fiber reinforced composite sheet and more particularly to a method of manufacturing a glass fiber reinforced composite sheet To a method of manufacturing an under cover for a vehicle using the same.

Generally, the under cover for a vehicle is mounted on the lower surface of the vehicle to protect the various components of the engine such as the engine and the lower part of the vehicle while preventing noise from being transmitted from the engine. To prevent the foreign object from splashing or bumping into the vehicle.

Such undercover can cause damage to powertrain parts such as engines and transmissions in the engine room because foreign bodies such as stones often bounce off the vehicle, and the lower surface of the vehicle under the under cover is rubbed when the vehicle passes over a hill or a hill. The undercover attached to the lower surface of the vehicle requires high strength, and thermoplastic composite material mixed with polypropylene resin and glass fiber is mainly used.

Such a thermoplastic composite material is excellent in light weight and rigidity and is used for structural parts of a vehicle such as a vehicle undercover, a bumper, a seat frame, etc. Examples of widely used thermoplastic composites include glass mat thermoplastic , Hereinafter referred to as 'GMT') and Long Fiber-Reinforced Thermoplastic (LFT). These GMT techniques are well known by the Swiss Quadrant and Azdel patents in the United States. The technology for LFT is based on Dieffenbacher (Germany), CPI (United States) It is well known by the patent.

1 is a schematic view showing a manufacturing process of a glass fiber mat thermoplastic composite (GMT) sheet. As shown in the drawing, a composite sheet 14 is formed by spraying glass fiber on continuous fibers, And a step of winding the polypropylene resin 11 and the additive 12 into the extruder 1 and heating and extruding the polypropylene resin 11 and the additive 12 through an extruder 1, , Stacking the two glass fiber mats (13) so as to be disposed between the polypropylene resin layers (11) extruded from the extruder (1) by unwinding the two glass fiber mats (13) Continuous processing using heat and pressure using a double belt press machine 3, and cutting the plate material to a predetermined size using a cutter 4. The composite sheet 14 thus cut is stacked on the stacker 5, and then heated in an oven (not shown) and press-formed.

The GMT is characterized by a glass fiber mat and a resin layer laminated in several layers and partially unidirectional reinforcement.

However, GMT has a limitation in the improvement of rigidity, such as the use of a non-woven glass fiber mat as a process using a press molding method using fluidity. In some cases, in order to improve the stiffness of GMT, it is possible to use a method of laminating a reinforcing sheet to GMT at the time of GMT press working to form a product, and then molding the same together. In this case, the flowability of GMT is lowered, There is a problem that it is difficult to stack, and the stacking of the stiffener is difficult and peeling phenomenon occurs.

Also, the binding force between the stiffener and the GMT depends on the temperature and the pressure. If the stiffener is separately inserted during the press forming, the temperature of the GMT is lowered and the peeling phenomenon occurs. Since the stiffener and the GMT are combined only by the pressure of the press The bond strength is weak.

2 is a schematic view showing a manufacturing process of a long fiber-reinforced composite (LFT) sheet. The long fiber-reinforced thermoplastic composite sheet 24 is formed by extruding a polypropylene resin 21, an additive 22, 23) are mixed and heated and extruded by an extruder, and the mixture is extruded into a plate by passing through a tie die (2) to be molded into a product shape as it is.

Such a method for producing a sheet of long fiber-reinforced composite (LFT) sheet has an advantage of being produced by a continuous process from a raw material to a product, but it is difficult to reinforce the long fiber by cutting the glass fiber into a certain length through a screw cutting edge of the extruder, The shape of the screw must be specially formed to impregnate the glass fiber, and the impregnation and kneading are performed using only twin screw, which has a problem of high initial facility investment cost due to expensive facilities.

Therefore, there is a growing demand for a method for manufacturing a vehicle undercover using a glass fiber reinforced composite sheet capable of overcoming the unreasonable point of the conventional method of producing a thermoplastic composite sheet, reducing facility investment costs, and improving rigidity with a light weight.

Korean Patent Publication No. 0000-00000000

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and an object of the present invention is to attach a polypropylene sheet to both sides of a glass fiber pellet, and to form an under cover for a vehicle by continuously forming an outer tube with a nonwoven fabric .

According to an aspect of the present invention, there is provided a method for manufacturing a glass fiber pellet, comprising the steps of: cutting glass fiber into a plurality of pellets by cutting a glass fiber into a predetermined size, Forming a glass fiber reinforced composite sheet by thermocompression bonding and cooling the glass fiber pellets in which the polypropylene sheet is laminated, forming a glass fiber reinforced composite sheet on the glass fiber reinforced composite sheet, Laminating nonwoven fabrics on both sides thereof, and forming an under cover molding by thermo compression bonding and cold molding of the glass fiber reinforced composite sheet on which the nonwoven fabric is laminated.

The step of forming the glass fiber reinforced composite sheet includes thermally pressing the glass fiber pellets in which the polypropylene sheet is laminated by a press to force the glass fiber pellet to melt and impregnate the polypropylene sheet, And compressing and cooling the resin-impregnated glass fiber pellet to solidify the polypropylene resin to form a glass fiber reinforced composite sheet.

The step of forming the under-cover molding may include the steps of pulling the glass fiber-reinforced composite sheet in which the non-woven fabric is laminated into a preheating mold having an internal temperature maintained at a predetermined temperature, melting the predetermined portion of the polypropylene sheet by hot pressing, Wherein the glass fiber reinforced composite sheet is softened by heating the glass fiber reinforced composite sheet for a certain period of time in a preheating mold, drawing the softened glass fiber reinforced composite sheet into a cooling mold maintained at a lower temperature than the preheating mold, And a trimming step of cutting the cold-formed glass fiber-reinforced composite sheet in the under cover shape into a final under-cover shape.

In addition, the step of producing the glass fiber pellets may include cutting the glass fiber into a predetermined size, supplying the glass fiber cut into a predetermined size to the measuring unit through the hopper, measuring the glass fiber according to a predetermined weight, Feeding the carded glass fibers to a carding machine so that the metered fiberglass spreads out in a layer form, superimposing the carded glass fibers on the conveyor belt in a multilayer manner on the conveyor belt to fit the carded weight, Is stretched by a needle punching machine, and a multilayered glass fiber layer layer is bound by needle punching to complete a glass fiber pellet.

According to the present invention as described above, the polypropylene sheet can be thermally compressed on both sides of the glass fiber pellets to improve the rigidity. The nonwoven fabric can be thermally pressed on the outer surface of the polypropylene sheet, It can be produced through a continuous process, thereby shortening the production time of the product and reducing the manufacturing cost.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing a process for producing a glass fiber mat thermoplastic composite (GMT) sheet.
2 is a schematic view showing a manufacturing process of a long fiber-reinforced composite (LFT) sheet.
3 is a flowchart showing a procedure for manufacturing a vehicle undercover using the glass fiber reinforced composite sheet according to the present invention.
4 is a schematic view showing a process of producing the glass fiber pellets according to the present invention.
5 is a view schematically showing a process for manufacturing a vehicle undercover using a glass fiber reinforced composite sheet according to the present invention.

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

FIG. 3 is a flowchart showing a procedure for manufacturing a vehicle undercover using a glass fiber reinforced composite sheet according to the present invention, FIG. 4 is a view schematically showing a process for producing a glass fiber pellet according to the present invention, Fig. 1 is a schematic view showing a process for manufacturing a vehicle under-cover using a glass fiber reinforced composite sheet according to the present invention.

Referring to the drawings, a method for manufacturing an under cover for a vehicle using a glass fiber reinforced composite sheet according to the present invention includes the steps of preparing a glass fiber pellet (S310), a polypropylene film lamination step (S320), a hot pressing impregnation step (S330) Step S340, a nonwoven fabric laminating step S350, a preheating step S360, a cold forming step S370 and a trimming step S380.

In the glass fiber pellet manufacturing step (S310), the glass fiber is cut into a predetermined size and bundled into multiple pellets to produce a sheet-form glass fiber pellet and wound in a roll form. Referring to Fig. 4, The cut fiber 20 is cut to 70 to 100 mm to soften the fiber, and the cut glass fiber is fed to the metering section 40 through the hopper 30. [

The glass fibers supplied to the metering section 40 are metered according to the weight of the mat and supplied to the carding machine 50. In the carding machine (50), the glass fiber is unfolded in a layer form by the effect of combing the glass fiber. The carded glass fibers are superimposed on the conveyor belt 60 in a multi-layered manner so as to have a constant weight.

The multi-layered glass fiber layer is stretched by the needle punching machine 70, and the multi-layered glass fiber layer layers are joined by the punching of the needle punching machine 70 to complete the glass fiber pellet (A) The obtained glass fiber pellets (A) are wound in a roll form.

In the polypropylene film laminating step (S320), the glass fiber pellets (A) thus completed and wound up are reapplied to laminate the polypropylene sheets (B) on both sides of the glass fiber pellets (A). Such a polypropylene sheet (B) is not supplied as a molten resin, so that the shape stability of the polypropylene sheet (B) is excellent after completion of the composite sheet.

In the hot-pressure forced impregnation step (S330), the glass fiber pellets (A) in which the polypropylene sheet (B) is laminated are thermo-compressed by the press 100 to melt the polypropylene sheet in a resin form, (A). In this hot pressing step, a certain pressure is provided to the glass fiber pellets A so that impregnation can be performed more easily.

In the compression cooling step S340, the glass fiber pellets A impregnated with the polypropylene resin (B) are compressed and cooled by the cooling press 200, and the polypropylene resin is solidified to form a glass fiber reinforced composite sheet.

In the nonwoven fabric lamination step (S350), the nonwoven fabric (C) is disposed on both sides of the thus formed glass fiber reinforced composite sheet.

In the preheating step (S360), the glass fiber reinforced composite sheet having the nonwoven fabric (C) laminated thereon is drawn into a preheating mold (300) maintained at an internal temperature of 200 to 220 DEG C, so that the polypropylene sheet The glass fiber reinforced composite sheet is pre-heated in the preheating mold 300 for about 180 to 200 seconds to soften the surface.

In the cold forming step S370, the softened glass fiber reinforced composite sheet is drawn into a cooling mold 400 having a temperature lower than that of the preheating mold 300, that is, the internal temperature is maintained at 20 to 40 DEG C, To form an under-cover shape.

That is, in the preheating mold 300 in the preheating step S360, the glass fiber reinforced composite sheet in which the nonwoven fabric is laminated with the flat metal mold is pressed in a state of being heated, and the cooling metal mold 400 ) Is formed by cold-pressing a glass fiber-reinforced composite sheet softened with an under cover-shaped metal mold at a relatively low temperature.

In the trimming step S380, the cold-formed glass fiber-reinforced composite sheet is cut into an undercover shape to form a final finished product.

As described above, in the method for manufacturing a vehicle undercover using the glass fiber reinforced composite sheet according to the present invention, a polypropylene sheet is attached to both sides of the glass fiber pellets and the outer tube is continuously formed with the nonwoven fabric.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications and variations without departing from the spirit and scope of the invention. Accordingly, the scope of the appended claims should include all such modifications and changes as fall within the scope of the present invention.

20: cutter 30: hopper
40: Metering unit 50: Carding machine
60: Conveyor belt 70: Needle punching machine
100: Press 200: Cooling press
300: preheating mold 400: cooling mold
A: Fiberglass pellets
B: Polypropylene resin
C: Nonwoven fabric

Claims (4)

Cutting the glass fiber into a predetermined size and bundling it into multiple pellets to produce a sheet-form glass fiber pellet and winding it;
Winding the wound glass fiber pellets and laminating a polypropylene sheet on both sides of the glass fiber pellets;
Thermally compressing and cooling the glass fiber pellets in which the polypropylene sheet is laminated to form a glass fiber reinforced composite sheet;
Laminating nonwoven fabrics on both sides of the glass fiber reinforced composite sheet;
And forming an under cover molding by thermo compression bonding and cold molding of the glass fiber reinforced composite sheet having the nonwoven fabric laminated thereon.
The method according to claim 1,
The step of forming the glass fiber reinforced composite sheet
Compressing the glass fiber pellet in which the polypropylene sheet is laminated by a press to force the polypropylene sheet to be partially melted and impregnated into the glass fiber pellet;
And compressing and cooling the glass fiber pellets impregnated with the polypropylene resin to solidify the polypropylene resin to form a glass fiber reinforced composite sheet.
The method according to claim 1,
The step of forming the undercover molding
The glass fiber reinforced composite sheet in which the nonwoven fabric is laminated is drawn into a preheating mold whose internal temperature is maintained at a predetermined temperature, the polypropylene sheet is partially melted by thermal compression, and is impregnated into the nonwoven fabric by force, Warming the surface in a preheating mold for a certain period of time to soften the surface;
Drawing the softened glass fiber reinforced composite sheet into a cooling mold maintained at a temperature lower than that of the preheating die, pressing the softened glass fiber reinforced composite sheet for a predetermined period of time,
A trimming step of cutting the cold-formed glass fiber-reinforced composite sheet in the under cover shape into a final under cover shape; Wherein the glass fiber-reinforced composite sheet is a glass fiber reinforced composite sheet.
The method according to claim 1,
The step of producing the glass fiber pellets comprises
Cutting the glass fiber into a predetermined size;
Feeding the cut glass fibers to a metering section through a hopper;
Measuring the glass fibers according to a predetermined weight in the metering unit;
Feeding the metered fiberglass into a carding machine so as to spread out in a layer form, and carding;
Layering the carded fiberglass on the conveyor belt to a predetermined weight;
Layered glass fiber layer is stretched by a needle punching machine and the glass fiber layer laminated in multiple layers is bound by needle punching to complete the glass fiber reinforced composite sheet A method for manufacturing an under cover for a vehicle.
KR1020150106696A 2015-07-28 2015-07-28 Method for manufacturing under cover for vehicle using glass fibrous reinforcing sheet KR20170014074A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180111148A (en) 2017-03-31 2018-10-11 코오롱인더스트리 주식회사 Nonwoven with improved strength and sound absorption, manufacturing method thereof and vehicle under cover composed of nonwoven with improved strength and sound absorption
WO2019031933A1 (en) * 2017-08-11 2019-02-14 (주)엘지하우시스 Airbag housing for vehicles and manufacturing method thereof
KR20190029351A (en) 2017-09-12 2019-03-20 이윤경 Method for manufacturing plastic panel reinforced with glass fibers
KR101968655B1 (en) * 2018-07-23 2019-04-16 현대합성공업 주식회사 A Study on the Manufacturing Method of the Other Opening Underbeat for the Vehicle to Improve the Sound Absorption Performance
KR20190044926A (en) * 2017-10-23 2019-05-02 주식회사 카마루 Method for manufacturing of cover for vehicle dashboard and cover for vehicle dashboard manufactured by the same
KR20200134757A (en) 2019-05-23 2020-12-02 코오롱글로텍주식회사 Under cover for vehicle and method thereof
KR102338005B1 (en) 2020-07-24 2021-12-10 장일규 Undercover for automobile and Preparing Method thereof
CN114618232A (en) * 2021-04-01 2022-06-14 江苏长海复合材料股份有限公司 Glass fiber air filtering material and application thereof
KR102513838B1 (en) * 2021-10-28 2023-03-27 주식회사 서연이화 Interior parts applying lightweight composite material and manufacturing method

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180111148A (en) 2017-03-31 2018-10-11 코오롱인더스트리 주식회사 Nonwoven with improved strength and sound absorption, manufacturing method thereof and vehicle under cover composed of nonwoven with improved strength and sound absorption
US11332863B2 (en) 2017-03-31 2022-05-17 Kolon Industries, Inc. Non-woven fabric with enhanced hardness and sound absorption, manufacturing method therefor, and automotive undercover comprising non-woven fabric with enhanced hardness and sound absorption
WO2019031933A1 (en) * 2017-08-11 2019-02-14 (주)엘지하우시스 Airbag housing for vehicles and manufacturing method thereof
KR20190029351A (en) 2017-09-12 2019-03-20 이윤경 Method for manufacturing plastic panel reinforced with glass fibers
KR20190044926A (en) * 2017-10-23 2019-05-02 주식회사 카마루 Method for manufacturing of cover for vehicle dashboard and cover for vehicle dashboard manufactured by the same
KR101968655B1 (en) * 2018-07-23 2019-04-16 현대합성공업 주식회사 A Study on the Manufacturing Method of the Other Opening Underbeat for the Vehicle to Improve the Sound Absorption Performance
KR20200134757A (en) 2019-05-23 2020-12-02 코오롱글로텍주식회사 Under cover for vehicle and method thereof
KR102338005B1 (en) 2020-07-24 2021-12-10 장일규 Undercover for automobile and Preparing Method thereof
CN114618232A (en) * 2021-04-01 2022-06-14 江苏长海复合材料股份有限公司 Glass fiber air filtering material and application thereof
CN114618232B (en) * 2021-04-01 2024-06-11 江苏长海复合材料股份有限公司 Glass fiber air filtering material and application thereof
KR102513838B1 (en) * 2021-10-28 2023-03-27 주식회사 서연이화 Interior parts applying lightweight composite material and manufacturing method

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