KR102212230B1 - Trunk for Thermoplastic Composite and preparation method thereof - Google Patents

Abstract

The present invention relates to a trunk and a manufacturing method thereof. In the trunk of the present invention, the trunk body and the reinforcement part, or the trunk body, the reinforcement part, the reinforcement groove, and the rib are formed in one mold through the one-shot overmolding method, so that the process cost can be reduced, and the reinforcement groove and the rib are included. As a result, loading capacity is improved and weight reduction is possible.

Description

Trunk for Thermoplastic Composite and preparation method thereof

The present invention relates to a thermoplastic composite trunk and a method of manufacturing the same.

In general, the trunk of a vehicle is located at the rear of the vehicle body, and is a space for loading various types of luggage. However, in the case of a midship vehicle or a vehicle in which the engine is arranged in the trunk space, the trunk is arranged in the space where the existing bonnet is located to secure the trunk space.

Metal and plastic are used as materials used. At this time, in the case of using plastic materials, injection molding products based on PP (polypropylene) and PA (polyamide) 6 materials based on thermoplastic materials are generally used, and based on thermosetting materials, such as sheet molding compound (SMC). There are products using the method.

The trunk has a difference in weight depending on the vehicle's loading capacity, but it has a weight of 3 to 10 kg at a minimum and 10 to 30 kg at most, and occupies a high weight in auto parts. Therefore, the need for weight reduction of the trunk is expanding. In particular, in the case of a vehicle to which the front trunk is applied, it is mainly used for high-performance vehicles or electric vehicles, and the need for weight reduction is quite high. In the case of injection products based on conventional thermoplastic materials, additional weight reduction is difficult due to the limitations of materials and has the disadvantage of having to be fixed to the surrounding vehicle body. Accordingly, there is a need to develop products using higher performance materials.

In the case of a front trunk to which a thermoplastic composite material is applied, a higher weight reduction ratio can be achieved compared to the conventional injection-type front trunk, but it has a problem that the price of parts increases. In addition, the insert overmolding process is complex, and an additional process in which the preformed preform must be inserted into the injection machine for final molding is generated, resulting in an increase in part production time and process cost. The insert overmolding refers to a method of inserting an insert (metal material, composite material) to reinforce structural rigidity and strength that is difficult to solve only with plastic injection. At this time, the insert is subjected to primary molding to suit the purpose to be reinforced. In the case of composite inserts, prepreg lamination, heating, compression, and processing are performed, and injection molding is performed by inserting these inserts into an injection mold. Therefore, there is a disadvantage in that cycle time and cost are increased due to a separate process for manufacturing an insert.

An object of the present invention is to arrange the continuous fiber-reinforced thermoplastic resin composite in a mold; Compression molding the composite material to form a trunk body; And forming a reinforcing part by disposing a long fiber-reinforced thermoplastic resin or an eco-friendly wood powder-reinforced thermoplastic resin while the trunk body is positioned in the mold.

Another object of the present invention is a trunk body comprising a continuous fiber-reinforced thermoplastic resin composite; And it is to provide a trunk comprising a reinforcing portion composed of a long fiber reinforced thermoplastic resin or eco-friendly wood powder reinforced thermoplastic resin.

In order to achieve the above object, in one aspect, the present invention comprises the steps of disposing a continuous fiber-reinforced thermoplastic resin composite in a mold; Compression molding the composite material to form a trunk body; And forming a reinforcing part by disposing a long fiber-reinforced thermoplastic resin or an eco-friendly wood powder-reinforced thermoplastic resin while the trunk body is located in the mold.

In another aspect, the present invention is a trunk body comprising a continuous fiber-reinforced thermoplastic resin composite; And it provides a trunk including a reinforcing portion composed of a long fiber reinforced thermoplastic resin or eco-friendly wood powder reinforced thermoplastic resin.

In the present invention, the thickness ratio of the trunk body and the reinforcement portion is 1.5:1 to 1:1.

In the present invention, a reinforcing groove is formed in the trunk body and the reinforcing part.

In the present invention, it further comprises a plurality of ribs located in the reinforcing groove cross each other.

In the present invention, the trunk body and the reinforcing portion or the trunk body and the reinforcing portion and ribs in which the reinforcing groove is formed are formed in one mold.

In the present invention, the rib is formed of a long fiber-reinforced thermoplastic resin or an eco-friendly wood powder-reinforced thermoplastic resin, or the width of the rib is formed of 1 to 6mm.

In the present invention, the thickness ratio of the trunk body in which the reinforcing groove is formed and the reinforcing portion is 1:0.66 to 1:3.

In the present invention, the ratio of the thickness and rib width of the reinforcing portion is 1:1 to 1:2.5.

In the present invention, the continuous fiber-reinforced thermoplastic resin composite includes 40 to 70% by weight of reinforcing fibers and 30 to 60% by weight of the thermoplastic resin.

In the present invention, the long fiber-reinforced thermoplastic resin comprises 20 to 40% by weight of reinforcing fibers and 60 to 80% by weight of the thermoplastic resin.

In the present invention, the eco-friendly wood powder-reinforced thermoplastic resin includes 20 to 40% by weight of wood flour and 60 to 80% by weight of the thermoplastic resin.

In the present invention, the reinforcing fiber is at least one selected from the group consisting of glass fiber, carbon fiber and aramid fiber, or the thermoplastic resin is polypropylene or polyamide.

The present invention relates to a trunk and a manufacturing method thereof. In the trunk of the present invention, the trunk body and the reinforcement part, or the trunk body and the reinforcement part, the reinforcement groove and the rib are formed in one mold through the one-shot overmolding method, so that the process cost can be reduced, and the reinforcement groove and the rib are included. As a result, loading capacity is improved and weight reduction is possible.

1 is a perspective view showing a trunk according to an embodiment of the present invention.
2 is an exploded perspective view of FIG. 1.
3 is a cross-sectional view of FIG. 1 taken along line III-III.
4 is a perspective view showing a trunk according to another embodiment of the present invention.
Figure 5 shows the bottom of the reinforcement according to another embodiment of the present invention.
6 is an exploded perspective view of FIG. 4.
7 is a cross-sectional view of the exploded perspective view of FIG. 6.
8 is a cross-sectional view of a trunk according to another embodiment of the present invention.
9 shows a bottom surface of a reinforcement part according to another embodiment of the present invention.
10 shows another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings so that those of ordinary skill in the art can easily implement it. However, the present invention may be implemented in various different forms, and is not limited to the embodiments or drawings described herein. The same reference numerals are assigned to similar parts throughout the specification.

In one aspect, the present invention comprises the steps of disposing a continuous fiber-reinforced thermoplastic resin composite in a mold; Compression molding the composite material to form a trunk body; And forming a reinforcing part by disposing a long fiber-reinforced thermoplastic resin or an eco-friendly wood powder-reinforced thermoplastic resin while the trunk body is located in the mold.

According to an embodiment of the present invention, the trunk of FIGS. 1 to 3 was manufactured. The manufacturing method of the trunk of the present invention includes a step (S10) of placing a continuous fiber-reinforced thermoplastic resin composite in a mold. The continuous fiber-reinforced thermoplastic resin composite includes 40 to 70% by weight of reinforcing fibers and 30 to 60% by weight of the thermoplastic resin. The reinforcing fibers may be at least one selected from the group consisting of glass fibers, carbon fibers and aramid fibers, or the thermoplastic resin may be polypropylene or polyamide.

By using the continuous fiber-reinforced thermoplastic resin composite material, a predetermined shape can be more firmly implemented, so that the structural rigidity of the trunk can be further improved, and the trunk itself can be reduced in weight. The continuous fiber-reinforced thermoplastic resin composite contains 40 to 70% by weight of reinforcing fibers and 30 to 60% by weight of a thermoplastic resin, and when the content of the reinforcing fibers exceeds 70% by weight, the weight of the amount of fiber to the amount of resin is increased, thereby forming There may be a problem that the liver fibers are pulled/aggregated and the resin between fibers is not impregnated. When the inter-fiber resin is not impregnated, there is a problem in that interfacial breakage occurs and structural breakage is easily generated, and when the reinforcing fiber content is less than 40% by weight, structural stiffness cannot be satisfied .

Next, it includes a step (S20) of compressing the composite material to form a trunk body. The trunk body 110 is formed by compressing the continuous fiber-reinforced thermoplastic composite material at a predetermined pressure using a compression mold. At this time, the shape of the trunk body 110 may vary according to the shape of the compression mold.

Next, a step (S30) of forming the reinforcing part 120 by disposing a long fiber-reinforced thermoplastic resin or an eco-friendly wood powder-reinforced thermoplastic resin in the state in which the trunk body 110 is positioned in the mold (S30). Without separating the trunk body 110 from the compression mold, a long fiber-reinforced thermoplastic composite material or an eco-friendly wood powder-reinforced thermoplastic resin is disposed in the mold while the trunk body 110 is located, and the trunk body 110 and the trunk body 110 are formed by injection molding. To form a connected reinforcing portion 120. Therefore, the trunk body 110 and the reinforcing part 120 are formed in one mold using a one-shot over-molding method.

The long fiber-reinforced thermoplastic resin includes 20 to 40% by weight of reinforcing fibers and 60 to 80% by weight of the thermoplastic resin. The reinforcing fiber may be at least one selected from the group consisting of glass fiber, carbon fiber and aramid fiber, and wood powder, which is an eco-friendly material, or the thermoplastic resin may be polypropylene or polyamide. When the content of the reinforcing fibers exceeds 40% by weight, fibers may be aggregated in the screw of the molding machine during the injection process, resulting in equipment damage, and a problem of molding defects (fiber agglomeration and fiber exposure) occurs, If the reinforcing fiber content is less than 20% by weight, the required performance is not satisfied .

The long fiber-reinforced thermoplastic resin is inexpensive compared to the continuous fiber-reinforced thermoplastic resin composite material, so that cost reduction can be achieved, and the design can be freely molded, and it has the advantage of being able to easily implement a variety of and more uniform appearances. In addition, there is an advantage of reinforcing a local shape by connecting to the trunk body 110.

Therefore, injection molding is performed by directly supplying the long fiber reinforced thermoplastic composite material to the reinforcing part 120 without separating the trunk body 110, which is first formed for injection molding and maintaining a high temperature, from the compression mold. In order to proceed with insert injection molding by supplying the preform to the injection mold, the compression molded preform is taken out from the compression mold, and the drawn preform is cut to fit the injection mold, and then inserted into the injection mold. I never do that. Accordingly, according to the present embodiment, compression molding and injection molding are performed in one mold in a one-shot overmolding method, so that time and cost can be saved compared to the conventional insert overmolding.

In addition, since compression molding for forming the trunk body 110 and injection molding for forming the reinforcing part 120 are performed in one compression mold, the trunk body 110 and the reinforcing part 120 have a high bonding force. That is, compression molding to form the trunk body 110 and injection molding to form the reinforcing part 120 are carried out in one mold in a one-shot overmolding method, and the trunk body 110 In a state where the gel state is maintained at a high temperature, since the long fiber-reinforced thermoplastic composite constituting the reinforcing part 120 is disposed in the compression mold, the continuous fiber-reinforced thermoplastic composite and the long fiber-reinforced thermoplastic composite are It is fused and bonded at a high temperature and has excellent interfacial adhesion.

In addition, compression molding and injection molding are carried out in one mold within a short time, so that the chemical bond between the trunk body 110 made of a continuous fiber reinforced thermoplastic composite and the reinforcement 120 made of a long fiber reinforced thermoplastic composite is inserted overmolding. Because it can be easily bonded, the one-shot overmolding is superior to the insert overmolding because it can be easily bonded.

The thickness ratio of the trunk body thickness 110W and the reinforcing portion 120W manufactured in FIGS. 1 to 3 may be 1.5:1 to 1:1. When the thickness ratio of the trunk body 110 and the reinforcing part 120 is out of the range of 1:1 to 1:2.5, the overall weight of the trunk increases or the deflection increases. It is not suitable for the front trunk that needs to maintain its shape.

In addition, a trunk according to another embodiment of the present invention is as follows with reference to FIGS. 4 to 9. Reinforcing grooves 110a and 120a may be formed in the trunk body 110 and the bottom of the reinforcing part 120. The trunk 100 may further include a plurality of ribs 121 and 122 positioned in the reinforcing groove 120a of the reinforcing part 120 and crossing each other. The rib may be formed by crossing a horizontal rib 121 formed along the X axis and a vertical rib 122 formed along the Y axis.

The trunk body 110 in which the reinforcing grooves 110a and 120a are formed, the reinforcing portion 120 and the ribs 121 and 122 are formed in one mold.

Specifically, a continuous fiber-reinforced thermoplastic resin composite is placed in a mold, compression molded to form the trunk body 110, and then reinforced with a long fiber-reinforced thermoplastic resin or eco-friendly wood powder while the trunk body 110 is located in the mold. A thermoplastic resin is disposed to form the reinforcing part 120 by injection molding, and at this time, compression molding and injection molding are simultaneously performed in one mold, and the trunk body 110 and the reinforcing part 120 have high bonding force. Is combined. In addition, reinforcing grooves 110a and 120a are formed in the trunk body 110 and the reinforcing part 120 by simultaneous or sequential injection molding, and located in the reinforcing grooves 120a of the reinforcing part 120 The plurality of ribs 121 and 122 are also formed by injection molding, so that compression molding and injection molding are performed in one compression mold by a one-shot over-molding method, so that the preform process can be omitted. In addition, in injection molding, injection of the reinforcing part 120, the reinforcing grooves 110a and 120a, and the ribs 121 and 122 is possible in one mold. Accordingly, it has an effect of reducing process cost and cycle time. In addition, due to a single process, the interfacial adhesion strength is achieved despite the fact that the contact area between the reinforcing groove 120a and the ribs 121 and 122 is only 5 to 20% by forming the ribs 121 and 122 in the reinforcing groove 120a. This becomes excellent.

After injection molding the reinforcing grooves 110a and 120a in the trunk body 110 and the reinforcing part 120, the ribs 121 and 122 may be injection-molded, or the reinforcing grooves 110a and 120a may be injection-molded and At the same time, the ribs 121 and 122 can be injection molded. As the material of the ribs 121 and 122, the same material as the material of the reinforcing part 120 may be used. Accordingly, the ribs 121 and 122 may be formed of a long fiber-reinforced thermoplastic resin or an eco-friendly wood powder-reinforced thermoplastic resin in the same manner as the reinforcing portion 120, and the width of the ribs 121 and 122 formed by injection molding is It can be formed in 1 to 6mm. When the long fiber-reinforced thermoplastic resin is used, it may contain 20 to 40% by weight of reinforcing fiber and 60 to 80% by weight of the thermoplastic resin, and when the eco-friendly wood powder-reinforced thermoplastic resin is used, 20 to 40% by weight of eco-friendly wood powder and thermoplastic It contains 60 to 80% by weight of resin.

The reinforcing fiber may be at least one selected from the group consisting of glass fiber, carbon fiber and aramid fiber, and wood powder, which is an eco-friendly material, or the thermoplastic resin may be polypropylene or polyamide.

In the trunk of FIGS. 4 to 9 in which the reinforcing grooves 110a and 120a are formed, a ratio of the thickness of the trunk body 110W to the thickness of the reinforcing portion 120W may be 1:0.66 to 1:3. When the thickness ratio of the trunk body 110 and the reinforcing portion 120 forming the reinforcing grooves 110a and 120a is out of 1:0.66 to 1:3, the thickness of the reinforcing portion becomes thin, and unmolding may occur. When the thickness of the part increases, the width of the performance increase relative to the weight decreases, thereby increasing the weight of the product.

In addition, referring to FIG. 7 of the present invention, a ratio of the thickness (120W) of the reinforcement portion and the rib width (W) may be 1:1 to 1:2.5. When the ratio of the thickness of the reinforcing portion 120 forming the reinforcing groove 120a to the rib width W is less than 1:1, the width of the rib is thinner than the length of the rib, so that the rib deformation and takeout between product takeouts after injection molding are reduced. There is a problem. In addition, when it exceeds 1:2.5, there is a problem that a sink mark (sucking after injection) occurs on the top surface of the product connected to the rib.

In the present invention, the trunk is not limited thereto, but may be a front trunk. In the case of the trunk 100 of FIGS. 4 to 9 in which the reinforcing grooves 110a and 120a and the ribs 121 and 122 are formed, the reinforcing grooves 110a and 120a and the trunk 100 of FIGS. 1 to 3 in which the ribs are not formed Compared to that, it is possible to reduce the weight by 1/5, and the amount of deflection for a 100kg load is less than 5mm, making it suitable for models that have a front trunk.

In addition, referring to FIG. 10, a protective layer 130 may be further included on the reinforcing part 120. By adding the protective layer 130, the amount of sagging can be further reduced, and the thickness of the trunk body 110 and the reinforcing portion 120 can be made thin to bring about a weight reduction effect. Non-woven fabrics, etc. are suitable as the protective layer 130, but are not limited thereto.

In another aspect, the present invention is a trunk body comprising a continuous fiber-reinforced thermoplastic resin composite; And it provides a trunk comprising a reinforcement portion composed of a long fiber reinforced thermoplastic resin or eco-friendly wood powder reinforced thermoplastic resin.

1 to 3, a trunk according to an embodiment of the present invention includes a trunk body 110 including a continuous fiber-reinforced thermoplastic resin composite; And a reinforcing part 120 made of a long fiber-reinforced thermoplastic resin or an eco-friendly wood powder-reinforced thermoplastic resin.

The trunk 100 includes a trunk body 110 and a reinforcing portion 120, and is manufactured by the manufacturing method as described above.

The trunk body 110 can further improve the structural rigidity of the trunk and reduce the weight of the trunk itself because a predetermined shape can be more firmly implemented by using the continuous fiber-reinforced thermoplastic resin composite material. The continuous fiber-reinforced thermoplastic resin composite contains 40 to 70% by weight of reinforcing fibers and 30 to 60% by weight of a thermoplastic resin, and when the content of the reinforcing fibers exceeds 70% by weight, the weight of the amount of fiber to the amount of resin is increased, thereby forming There may be a problem that the liver fibers are pulled/aggregated and the resin between fibers is not impregnated. When the inter-fiber resin is not impregnated, there is a problem in that interfacial breakage occurs and structural breakage is easily generated. When the reinforcing fiber content is less than 40% by weight, structural rigidity is not satisfied.

The reinforcing part 120 is composed of a long fiber-reinforced thermoplastic resin, and includes 20 to 40% by weight of reinforcing fibers and 60 to 80% by weight of the thermoplastic resin. In addition, when composed of the eco-friendly wood powder reinforced thermoplastic resin, it includes 20 to 40% by weight of eco-friendly wood powder and 60 to 80% by weight of the thermoplastic resin. The reinforcing fibers may be at least one selected from the group consisting of glass fibers, carbon fibers and aramid fibers, or the thermoplastic resin may be polypropylene or polyamide. When the content of the reinforcing fiber exceeds 40% by weight, the fibers may be aggregated in the screw of the molding machine between the injection process and equipment damage may occur, and a problem of molding defects (fiber agglomeration and fiber exposure) occurs, If the reinforcing fiber content is less than 20% by weight, the required performance is not satisfied.

The long fiber-reinforced thermoplastic resin is inexpensive compared to the continuous fiber-reinforced thermoplastic resin composite material, so that cost reduction can be achieved, and the design can be freely molded, and it has the advantage of being able to easily implement a variety of and more uniform appearances. In addition, there is an advantage of reinforcing a local shape by connecting to the trunk body 110.

In the trunk of FIGS. 1 to 3 according to an embodiment of the present invention, the ratio of the thickness of the trunk body 110W and the thickness of the reinforcement portion 120W may be 1.5:1 to 1:1. When the thickness ratio of the trunk body 110 and the reinforcing part 120 is out of the range of 1.5:1 to 1:1, the overall weight of the trunk increases or the deflection increases to 5.8 or more, so that the trunk, especially, weight reduction is required. Is not suitable for the front trunk.

In the trunk 100 of FIGS. 4 to 9 according to another embodiment of the present invention, the trunk body 110 and the reinforcing part 120 may have reinforcing grooves 110a and 120a, and the reinforcing grooves It may further include a plurality of ribs (121, 122) located at (120a) crossing each other. The rib may be formed by crossing a horizontal rib 121 formed along the X axis and a vertical rib 122 formed along the Y axis.

Compared to the trunk of FIGS. 1 to 3, in the case of the trunk of FIGS. 4 to 9, the load is evenly distributed not only to the bottom of the trunk but also to the side by loading even if the reinforcing grooves and ribs are further included, the reinforcing grooves 110a, 120a) and the ribs 121 and 122 are not formed, the amount of sagging is significantly reduced compared to the trunk of FIGS. 1 to 3, and the weight can be reduced to a level of 1/5, making it suitable as a front trunk.

The ribs 121 and 122 may be formed of a long fiber reinforced thermoplastic resin composite or an eco-friendly wood powder reinforced thermoplastic resin, or the width of the ribs may be 1 to 6 mm. Referring to FIG. 6 of the present invention, the reinforcing part The ratio of the thickness (120W) and the rib width (W) may be 1:1 to 1:2.5. When the ratio of the thickness of the reinforcing portion 120 forming the reinforcing groove 120a to the rib width W is less than 1:1, the width of the rib is thinner than the length of the rib, so that the rib deformation and takeout between product takeouts after injection molding are reduced. There is a problem. In addition, when it exceeds 1:2.5, there is a problem that a sink mark (sucking after injection) occurs on the top surface of the product connected to the rib.

Referring to the trunk of FIGS. 4 to 9, the ratio of the thickness of the trunk body 110W and the thickness of the reinforcement portion 120W may be 1:0.66 to 1:3. When the thickness ratio of the trunk body 110 and the reinforcing portion 120 forming the reinforcing grooves 110a and 120a is out of 1:0.66 to 1:3, the thickness of the reinforcing portion becomes thin, and unmolding may occur. When the thickness of the part increases, the width of the performance increase relative to the weight decreases, thereby increasing the weight of the product.

In addition, in the present invention, referring to FIG. 10, a protective layer 130 may be further included on the reinforcing part 120. By adding the protective layer 130, the amount of sagging may be further reduced, and the thickness of the trunk body 110 and the protective layer 130 may be made thinner to bring about a light weight effect. The material of the protective layer 130 is not limited.

Hereinafter, the present invention will be described in more detail by examples. However, the following examples are merely illustrative of the present invention, and the contents of the present invention are not limited to the following examples.

Example 1: Preparation of trunk

In order to form the trunk body, a continuous fiber-reinforced thermoplastic resin composite (CFT) containing 60% by weight of glass fiber and 40% by weight of polypropylene was used.

In order to form the reinforcing portion and the rib, a long fiber-reinforced thermoplastic resin (LFT) containing 30% by weight of glass fibers and 70% by weight of polypropylene was used.

The continuous fiber-reinforced thermoplastic resin composite (CFT) was placed in a mold and then compression molded to form a trunk body. At this time, the trunk body was formed to a thickness of 0.5mm.

The long fiber-reinforced thermoplastic resin composite (LFT) was placed in the mold with the trunk body positioned, and injection-molded so that the thickness of the reinforcing portion became 0.5 mm by using a one-shot over-molding method. In addition, a reinforcing groove was additionally formed in the trunk body and the reinforcing portion, and a plurality of ribs were formed in the reinforcing groove. At this time, the width of the rib was 2.0 mm, and the total weight of the trunk was 837.2 g.

Example 2

Prepared in the same manner as in Example 1, but the thickness of the trunk body was 1.0 mm, the thickness of the reinforcement portion was 1.0 mm, and the width of the rib was 0.5 mm instead of the thickness of the trunk body of 0.5 mm, the thickness of the reinforcement portion of 0.5 mm, and the width of the ribs of 0.5 mm. And the total weight of the trunk was 1,305.0g.

Example 3

Prepared in the same manner as in Example 1, except that the thickness of the trunk body is 0.5mm, the thickness of the reinforcement part is 0.5mm, the thickness of the trunk body is 1.0mm, the thickness of the reinforcement part is 1.0mm, and the width of the rib is 1.0mm. The total weight of the trunk was 1,397.0g.

Example 4

Prepared in the same manner as in Example 1, but instead of 0.5mm thickness of the trunk body, 0.5mm thickness of the reinforcement part, and the width of 0.5mm rib, the thickness of the trunk body was 1.0mm, the thickness of the reinforcement part was 1.0 mm, and the width of the rib was 1.5mm. The total weight of the trunk was 1,444.0g.

Example 5

Prepared in the same manner as in Example 1, but instead of 0.5mm thickness of the trunk body, 0.5mm thickness of the reinforcement part, and the width of 0.5mm rib, the thickness of the trunk body was 1.0mm, the thickness of the reinforcement part was 1.0 mm, and the width of the rib was 2.0mm. The total weight of the trunk was 1,490.0g.

Comparative Example 1

Prepared in the same manner as in Example 1, but instead of 0.5mm thickness of the trunk body, 0.5mm thickness of the reinforcement part, and the width of 0.5mm rib, the thickness of the trunk body was 0.5mm, the thickness of the reinforcement part was 0.5mm, and the width of the rib was 1.0mm. The total weight of the trunk was made to be 744.9g.

Comparative Example 2

Prepared in the same manner as in Example 1, but instead of 0.5mm thickness of the trunk body, 0.5mm thickness of the reinforcement part, and the width of 0.5mm rib, the thickness of the trunk body was 0.5mm, the thickness of the reinforcement part was 0.5mm, and the width of the rib was 1.5mm. The total weight of the trunk was manufactured as 791.0g.

Comparative Example 3

Prepared in the same manner as in Example 1, except that the thickness of the trunk body is 0.5mm, the thickness of the reinforcement part is 0.5mm, the thickness of the trunk body is 2.0mm, the thickness of the reinforcement part is 2.0mm, and the width of the rib is 0.5mm. The total weight of the trunk was 2,656.0g.

Comparative Example 4

Prepared in the same manner as in Example 1, except that the thickness of the trunk body is 0.5mm, the thickness of the reinforcement part is 0.5mm, the thickness of the trunk body is 2.0mm, the thickness of the reinforcement part is 2.0mm, and the width of the rib is 1.0mm. The total weight of the trunk was manufactured as 2,703.0g.

Example 6

In order to form the trunk body, a continuous fiber-reinforced thermoplastic resin composite (CFT) containing 60% by weight of glass fiber and 40% by weight of polypropylene was used.

In order to form the reinforcement part and the rib, an eco-friendly wood powder reinforced thermoplastic resin (MWF) containing 30% by weight of eco-friendly wood powder and 70% by weight of polypropylene was used.

The continuous fiber-reinforced thermoplastic resin composite (CFT) was placed in a mold and then compression molded to form a trunk body. At this time, the trunk body was formed to a thickness of 1.0 mm.

The eco-friendly wood powder reinforced thermoplastic resin was disposed in the state where the trunk body was located in the mold, and injection-molded so that the thickness of the reinforcement portion became 1.0 mm by using a one-shot over-molding method. In addition, a reinforcing groove was additionally formed in the trunk body and the reinforcing portion, and a plurality of ribs were formed in the reinforcing groove. At this time, the width of the rib was 1.0 mm, and the total weight of the trunk was 1,285.0 g.

Example 7

Prepared in the same manner as in Example 6, except that the thickness of the trunk body is 1.0mm, the thickness of the reinforcement part is 1.0mm, the thickness of the reinforcement part is 1.0mm, the thickness of the reinforcement part is 1.0mm, and the width of the rib is 1.5mm. The total weight of the trunk was 1,325.0g.

Example 8

Prepared in the same manner as in Example 6, except that the thickness of the trunk body was 1.0mm, the thickness of the reinforcement part 1.0mm, the thickness of the trunk body was 1.0mm, the thickness of the reinforcement part was 1.0mm, and the width of the rib was 2.0mm. The total weight of the trunk was 1,365.0g.

Comparative Example 5

Prepared in the same manner as in Example 5, except that the thickness of the trunk body 1.0mm, the thickness of the reinforcement part 1.0mm, the thickness of the trunk body was 0.5mm, the thickness of the reinforcement part was 0.5mm, the width of the rib was 2.0mm instead of the width of the rib. The total weight of the trunk was made as 762.8g.

Comparative Example 6

Prepared in the same manner as in Example 5, except that the thickness of the trunk body 1.0mm, the thickness of the reinforcement part 1.0mm, the thickness of the trunk body was 1.0mm, the thickness of the reinforcement part was 1.0mm, and the width of the rib was 0.5mm. The total weight of the trunk was 1,245.0g.

Comparative Example 7

Prepared in the same manner as in Example 5, but instead of 1.0mm thickness of the trunk body, 1.0mm thickness of the reinforcement part, and the width of 1.0mm rib, the thickness of the trunk body was 2.0mm, the thickness of the reinforcement part was 2.0mm, and the width of the rib was 0.5mm. The total weight of the trunk was 2,450.0g.

Comparative Example 8

Prepared in the same manner as in Example 5, but instead of 1.0mm thickness of the trunk body, 1.0mm thickness of the reinforcement part, and the width of 1.0mm rib, the thickness of the trunk body was 2.0mm, the thickness of the reinforcement part was 2.0mm, and the width of the rib was 1.0mm. The total weight of the trunk was 2,491.0g.

Experimental Example: Analysis of the measurement result of the deflection amount

Using the trunks of Examples 1 to 7 and Comparative Examples 1 to 8, an analytical review was conducted to confirm the deflection according to the weight of 100 Kg.

Table 1 below shows the deflection of the trunk according to the manufacturing methods of Examples 1 to 7 and Comparative Examples 1 to 8.

[Table 1]

As can be seen from Table 1, in the case of Examples 1 to 8, the amount of sag was less than 5.0 mm, but in the case of Comparative Examples 1 to 8, it was found that the amount of sag was too large to be suitable as a front trunk. In addition, it was found that when the ratio of the thickness of the reinforcing portion and the rib width is 1:1 to 1:2.5, the amount of deflection is the smallest.

In addition, looking at the results of Example 5 (use of long fiber reinforced thermoplastic resin) and Example 8 (use of eco-friendly wood powder reinforced thermoplastic resin), Example 8 (sag amount: 3.239) compared to Example 5 (sag amount: 2.254) Although it is slightly inferior, it is satisfied with the required performance, and it can be confirmed that it is more lightweight.

100: trunk 110: trunk body
110a: reinforcement groove 110W: trunk body thickness
120: reinforcement part 120a: reinforcement groove
120W: reinforcement thickness 121: horizontal rib
122: vertical rib W: rib width
130: protective layer

Claims (21)

Placing a continuous fiber-reinforced thermoplastic resin composite in a mold;
Compression molding the composite material to form a trunk body; And
Including the step of forming a reinforcement by disposing an eco-friendly wood powder reinforced thermoplastic resin in the state in which the trunk body is located in the mold,
A reinforcing groove is formed in the trunk body and the reinforcing part,
The reinforcing groove of the reinforcing portion includes a rib composed of a plurality of eco-friendly wood powder reinforced thermoplastic resins crossing each other,
The eco-friendly wood powder reinforced thermoplastic resin includes 20 to 40% by weight of wood flour and 60 to 80% by weight of the thermoplastic resin,
The ratio of the thickness of the reinforcing portion and the rib width is 1:1 to 1:2.5,
How to make a trunk. The method of claim 1, wherein the trunk body and the reinforcing portion have a thickness ratio of 1.5:1 to 1:1. delete delete In claim 1,
The trunk body and the reinforcing portion or the trunk body and the reinforcing portion and ribs having a reinforcing groove formed therein are formed in one mold. The method of claim 1, wherein the rib has a width of 1 to 6 mm. The method of claim 1, wherein the trunk body in which the reinforcing groove is formed and the thickness ratio of the reinforcing portion are 1:0.66 to 1:3. delete The method of claim 1, wherein the continuous fiber-reinforced thermoplastic resin composite comprises 40 to 70% by weight of reinforcing fibers and 30 to 60% by weight of a thermoplastic resin. delete delete In claim 9,
The reinforcing fiber is at least one selected from the group consisting of glass fiber, carbon fiber and aramid fiber,
The thermoplastic resin is polypropylene or polyamide, the method of manufacturing a trunk. delete Trunk body comprising a continuous fiber-reinforced thermoplastic resin composite; And
Including a reinforcement part composed of eco-friendly wood powder reinforced thermoplastic resin,
The trunk body and the reinforcing portion are formed with reinforcing grooves,
The reinforcing groove of the reinforcing portion includes a rib composed of a plurality of eco-friendly wood powder reinforced thermoplastic resins intersecting each other,
The eco-friendly wood powder reinforced thermoplastic resin includes 20 to 40% by weight of wood flour and 60 to 80% by weight of the thermoplastic resin,
The ratio of the thickness and rib width of the reinforcing portion is 1:1 to 1:2.5,
trunk. The trunk of claim 14, wherein the trunk body and the reinforcing portion have a thickness ratio of 1.5:1 to 1:1. delete delete In clause 14
The trunk body and the reinforcement portion or the trunk body and the reinforcement portion and ribs in which the reinforcing groove is formed are formed in one mold. The trunk of claim 14, wherein the rib has a width of 1 to 6 mm. [15] The trunk of claim 14, wherein the trunk body in which the reinforcing groove is formed and the thickness ratio of the reinforcing portion are 1:0.66 to 1:3. delete

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