KR101254363B1 - Method For Preparing Long Fiber Reinforced Thermoplastic Profile And Apparatus Thereof - Google Patents

Abstract

The present invention relates to a method for manufacturing a profile of a long fiber-reinforced thermoplastic material and a manufacturing apparatus thereof, and more particularly, to a LFT-D (Long Fiber Reinforced Thermoplastic-Direct Compounding) extruder and a roll forming device configured with first and second extruders. A method of continuously producing a long fiber reinforced thermoplastic (LFT) profile using a roll, the method comprising: a) preparing a thermoplastic resin composition by melting and kneading a thermoplastic resin and an additive into the first extruder; b) preparing a long fiber-reinforced thermoplastics by mixing the prepared thermoplastic resin composition with continuous or discontinuous fibers by kneading the second extruder; c) continuously extruding the prepared long fiber reinforced thermoplastic plastics using an extrusion die to produce a long fiber reinforced thermoplastic plastic extrudate having a constant size and shape; d) continuously passing the roll for forming the roll forming, then cutting with a cutter to produce a profile having a predetermined size and shape; made of a long fiber reinforced thermoplastic material It relates to a method for producing a profile.

According to the present invention, by combining the LFT-D method and the roll forming method, there is an effect of providing a method for producing a profile of long-fiber-reinforced thermoplastics material with low degradation and economical and continuous.

Long Fiber Reinforced Thermoplastics, Profiles, LFT-D Extruders, Roll Forming Rolls, Dies

Description

Method for manufacturing profile of long fiber reinforced thermoplastic material and apparatus therefor {Method For Preparing Long Fiber Reinforced Thermoplastic Profile And Apparatus Thereof}

The present invention relates to a method for manufacturing a profile of a long fiber-reinforced thermoplastic material and a manufacturing apparatus thereof, and more particularly, by combining the LFT-D method and the roll forming method, the deterioration is reduced and economically and continuously. A method for manufacturing a profile and an apparatus for manufacturing the same.

Profiles include architectural or automotive profiles, and the like are manufactured by extrusion molding steel, aluminum or plastic compositions, or by a roll forming method.

The roll forming method is a method in which a strip-shaped sheet material continuously supplied is sequentially transformed into a circular cross-sectional shape while passing between continuously arranged roll stands, and used to manufacture a profile or to join pipes by joining both ends. do.

The rolls are generally used to selectively place the pressing and non-pressing sections on the convex and concave rolls so that the sheet material gradually achieves the desired profile as it passes through the roll pairs.

Long Fiber-Reinforced Thermoplastic (LFT) is used for structural parts of vehicles such as impact beams, seat frames, etc. inside bumpers, which require light weight and strength at the same time. It is manufactured by the LFT-D method and the like.

The LFT is first produced in sheet form. The sheet-shaped LFT is heated in an oven, laminated with a reinforcing sheet having improved mechanical properties, and then manufactured as an impact beam by a high pressure press molding machine. In the oven, deterioration in physical properties due to deterioration is a problem.

In order to solve the problems of the prior art as described above, the present invention provides a method for manufacturing a profile of long-fiber-reinforced thermoplastic plastic material continuously and economically by combining the LFT-D method and the roll forming method and a manufacturing apparatus thereof It aims to do it.

These and other objects of the present invention can be achieved by the present invention described below.

In order to achieve the above object, the present invention is a long-fiber-reinforced thermoplastics (LFT) continuously using a Long Fiber Reinforced Thermoplastic-Direct Compounding (LFT-D) extruder and a roll forming roll composed of first and second extruders A method for producing a profile of a material, comprising: a) preparing a thermoplastic resin composition by melt kneading a thermoplastic resin and an additive into a first extruder; b) preparing a long fiber reinforced thermoplastic by feeding the prepared thermoplastic resin composition and continuous or discontinuous fibers into a second extruder and kneading them; c) continuously extruding the prepared long fiber reinforced thermoplastic plastics using an extrusion die to produce a long fiber reinforced thermoplastic plastic extrudate having a constant size and shape; d) continuously passing the manufactured extrudate through a roll forming roll, and then cutting with a cutting machine to produce a profile having a predetermined size and shape; profile of a long fiber reinforced thermoplastic material Provided are a manufacturing method and an apparatus for manufacturing the same.

As described above, according to the present invention, a method of manufacturing a profile of a long-fiber-reinforced thermoplastic material, an impact beam for automobiles, and the like by combining the LFT-D method and the roll forming method with low deterioration and economical, and a manufacturing apparatus thereof Has the effect of providing.

Hereinafter, the present invention will be described in detail.

According to the present invention, a method for manufacturing a profile of a long fiber reinforced thermoplastic material is performed by using a long fiber reinforced thermoplastic (LFT-D) extruder composed of first and second extruders and a roll for roll forming. A method for producing a profile of a (LFT) material, comprising: a) preparing a thermoplastic resin composition by melting and kneading a thermoplastic resin and an additive into a first extruder; b) preparing a long fiber reinforced thermoplastic by feeding the prepared thermoplastic resin composition and continuous or discontinuous fibers into a second extruder and kneading them; c) continuously extruding the prepared long fiber reinforced thermoplastic plastics using an extrusion die to produce a long fiber reinforced thermoplastic plastic extrudate having a constant size and shape; d) passing the produced extrudate continuously through a roll forming roll, and then cutting with a cutting machine to produce a profile having a predetermined size and shape; characterized in that it comprises a.

The LFT-D extruder is composed of first and second extruders, and the first extruder is not particularly limited as long as the first extruder is capable of melt-kneading the thermoplastic resin and additives to be transferred to the second extruder, and the second extruder is thermoplastic. The resin composition and the continuous or discontinuous fibers are not particularly limited as long as they can be kneaded.

The first and second extruders are functionally divided, and each of the first and second extruders may be preferably one or more extruders, but may be one extruder including both the functions of the first and second extruders.

The thermoplastic resin may be at least one selected from the group consisting of polyolefins, polyamides, ABS resins, polyethylene terephthalates and the like, and is preferably polyolefin.

The additive may be at least one selected from the group consisting of antioxidants, heat stabilizers, pigments, dispersants and compatibilizers.

The continuous or discontinuous fibers may be at least one selected from the group consisting of glass fibers, basalt fibers, carbon fibers, aramid fibers, and the like, and are preferably glass fibers subjected to surface treatment for polyolefins.

The extrusion die preferably has the shape and size of its cross section similar to or coincident with the shape and size of the cross section of the profile from which it is produced.

The roll forming roll is composed of an upper roll, a lower roll, and a pressurized space (a gap between the upper roll and the lower roll), and the upper roll and the lower roll rotate together in pairs, and the profile cross section in which the pressurized space is manufactured. The outer circumferential surfaces of the upper and lower rolls are designed to be similar to or match the shape of.

The outer circumferential surfaces of the upper roll, the lower roll, and the pressurized space do not change when rotated.

It is preferable that the roll forming rolls are three or more, and the temperature thereof is preferably lowered sequentially from the extruder. As a specific example, when there are three roll forming rolls, the closest to the extruder is about 200 ° C. and around 150 ° C., respectively. And about 100 ° C.

The plurality of roll forming rolls is the same as the cross section of the profile in which the respective pressurized space is finally formed, or the size thereof is sequentially reduced so that the press space of the last roll forming roll is the same as the cross section of the profile in which the final roll forming roll is finally formed. Can be designed.

The upper roll, lower roll and the pressurized space may be designed in various ways according to the shape and size of the profile to be manufactured.

Optionally, by attaching a take-out device (a device for pulling the extrudate at a constant speed) to the end of the roll forming apparatus, the extrudate can be withdrawn at a constant speed, in which case the defective rate is reduced.

The long fiber-reinforced thermoplastics extrudates may be roll formed by selectively laminating plastic sheets and the like on top and bottom thereof before roll forming.

The profile may be an architectural profile, composite square or automotive impact beam, or the like.

The apparatus for producing a profile made of a long fiber reinforced thermoplastic (LFT) material of the present invention comprises a Long Fiber reinforced Thermoplastic-Direct compounding (LFT-D) extruder composed of first and second extruders, roll forming rolls, and a cutting machine. Characterized in that the sequence is combined to enable a continuous process.

The first and second extruders are functionally divided, preferably one or more extruders, respectively, but may be one extruder including all the functions of the first and second extruders.

Specific examples of the apparatus for producing a profile of the long fiber-reinforced thermoplastic material of the present invention and a cross section of the profile manufactured therefrom are schematically illustrated in FIG. 1.

The profile manufacturing apparatus of FIG. 1 includes an LFT-D extruder 100, a roll forming apparatus 200, and a cutting machine 300, and the LFT-D extruder 100 includes a first extruder 102 and a second extruder ( 104, the roll forming apparatus 200 includes an upper roll 201, a lower roll 202, and a pressurized space 203.

The first extruder 102 is melt kneaded and introduced into the thermoplastic resin and the additive 101, including a single screw, and then transferred to the second extruder 104.

The processing temperature and the rotational speed (rpm) during the melt kneading are not particularly limited as long as the processing temperature and the rotational speed are conventionally applied to the thermoplastic resin and the additive to be injected, but the degradation of the thermoplastic resin composition is minimized and can be uniformly kneaded. It is preferable to exist in the range.

The second extruder 104 kneads the continuous fiber 103, including the twin screw, and the thermoplastic resin composition introduced from the first extruder 104, and then uses a extrusion die 105 to achieve a constant size and shape. The long fiber reinforced thermoplastic plastic extrudate 106 having is continuously produced.

The continuous fiber 103 is cut into long fibers of a suitable size when kneaded to provide sufficient rigidity to the extrudate extruded through the extrusion die 105, the long fibers are subjected to high shear stress (shear stress) inside the extruder.

The extrudate 106 is similar in shape and size to the cross section of the profile finally produced, but is not the same as it is expanded by the elastic restoring force of the long fibers after extrusion.

The expanded extrudate 106 enters the roll forming apparatus 200 consisting of three roll forming rolls, which consists of the upper roll 201, the lower roll 202, and the pressurized space 203, and gradually cools the upper roll. By pressing by the 201 and the lower roll 202, the cross section and the shape and size of the finally produced profile are the same, and by cutting the cutter 300 to a constant length, the profile 400 according to the present invention is continuously Is manufactured).

2 is a cross-sectional view schematically showing a roll for forming a roll according to the present invention and a profile produced therefrom.

The roll forming roll is composed of an upper roll 201, a lower roll 202, and a pressurized space 203, and an extrudate 106 extruded from an LFT-D extruder is introduced into the pressurized space 203 to be upper part. Pressed by the roll 201 and the lower roll 202 is molded into the same shape and size as the cross section of the pressurizing space 203, by cutting the cut to a constant length by the cutting machine 300 to finally profile 1 according to the present invention 401 is prepared.

It will be apparent to those skilled in the art that various modifications and modifications can be made within the scope and spirit of the present invention only by illustrating the present invention and the method for manufacturing the profile of the long fiber-reinforced thermoplastic material according to the present invention. It is natural that such variations and modifications fall within the scope of the appended claims.

Figure 1 is a schematic diagram showing a cross-sectional view of the apparatus for producing a profile of the long-fiber reinforced thermoplastic (LFT) material of the present invention and the profile produced therefrom.

Figure 2 is a schematic diagram schematically showing a cross section of a roll for forming rolls and a profile produced therefrom according to the present invention.

* Description of Major Symbols in Drawings *

100: LFT-D Extruder 101: Thermoplastics and Additives

102: first extruder 103: continuous fiber

104: second extruder 105: extrusion die

200: roll forming apparatus 201: upper roll

202: lower roll 203: pressurized space

300: cutter 400: profile

401: profile 1

Claims (11)

A method of continuously manufacturing a long fiber reinforced thermoplastic (LFT) profile by using a long fiber reinforced thermoplastic (LFT-D) extruder composed of first and second extruders and a roll forming roll, a) preparing a thermoplastic resin composition by melting and kneading the thermoplastic resin and an additive into the first extruder; b) preparing a long fiber-reinforced thermoplastics by mixing the prepared thermoplastic resin composition with continuous or discontinuous fibers by kneading the second extruder; c) continuously extruding the prepared long fiber reinforced thermoplastics using an extrusion die to produce sheet-shaped long fiber reinforced thermoplastics extrudates having a constant size and shape; d) Pass the roll forming roll continuously while laminating the plastic sheet on the top and bottom of the sheet-shaped long fiber-reinforced thermoplastics extrudate, then cut with a cutter to produce a constant size and shape. Producing a profile having; Process for producing profiles of long fiber reinforced thermoplastics. The method of claim 1, The thermoplastic resin is at least one member selected from the group consisting of polyolefins, polyamides, ABS resins and polyethylene terephthalates. Process for producing profiles of long fiber reinforced thermoplastics. The method of claim 1, The additive is at least one member selected from the group consisting of antioxidants, heat stabilizers, dispersants, compatibilizers and pigments. Process for producing profiles of long fiber reinforced thermoplastics. The method of claim 1, The fiber is at least one member selected from the group consisting of glass fiber, basalt fiber, carbon fiber and aramid fiber. Process for producing profiles of long fiber reinforced thermoplastics. The method of claim 1, The extrusion die is characterized in that the shape of the cross section matches the shape of the cross section of the profile to be produced. Process for producing profiles of long fiber reinforced thermoplastics. The method of claim 1, The roll forming roll, the upper roll and the lower roll is joined together and rotated together, characterized in that the outer peripheral surface of the upper roll and the lower roll is designed so that the gap between the upper roll and the lower roll is in the shape of the profile cross section is manufactured. Process for producing profiles of long fiber reinforced thermoplastics. The method of claim 1, The roll forming roll is three or more, characterized in that Process for producing profiles of long fiber reinforced thermoplastics. 8. The method of claim 7, The roll forming roll is characterized in that the temperature is sequentially lowered from the extruder Process for producing profiles of long fiber reinforced thermoplastics. The method of claim 1, The extrudate of d) is characterized in that the plastic sheet is laminated on the upper and lower portion and pass through the roll forming roll together Process for producing profiles of long fiber reinforced thermoplastics. The method of claim 1, The profile is characterized in that the building profile, composite square material or automotive impact beam Process for producing profiles of long fiber reinforced thermoplastics. It consists of a Long Fiber reinforced Thermoplastic-Direct compounding (LFT-D) extruder composed of first and second extruders, rolls and cutters for roll forming, The first extruder is prepared by melting and kneading a thermoplastic resin and an additive to prepare a thermoplastic resin composition, and the second extruder is prepared by adding and kneading continuous or discontinuous fibers with the prepared thermoplastic resin composition to prepare a long fiber reinforced thermoplastic plastic. However, by continuously extruding the prepared long fiber reinforced thermoplastic plastic using an extrusion die (die) to prepare a sheet-shaped long fiber reinforced thermoplastic plastic extrudates having a predetermined size and shape, the sheet prepared The sheet is formed into a profile having a constant size and shape by passing the roll for forming the roll continuously in a state of laminating a plastic sheet on the top and bottom of the long-fiber-reinforced thermoplastic extrudate of sheet shape, Apparatus for producing a profile of long-fiber-reinforced thermoplastic (LFT) material, characterized in that they are sequentially combined to enable a continuous process.

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