KR20200031192A - Roof damping pad for vehicle - Google Patents

Abstract

The present invention relates to a roof damping pad for a vehicle with reinforced stiffness. According to the present invention, reinforced kraft paper is manufactured by inserting a glass fiber between two krafts in a wick shape, and the reinforced kraft paper is mounted on at least one surface of polyurethane foam, such that the stiffness is reinforced with kraft paper, a vibration and noise relieving effect can be obtained with the glass fiber, and the weight of a vehicle can be reduced. In particular, the glass fiber is manufactured in a fabric shape to be used in manufacturing of the reinforced kraft paper, such that the reinforced kraft paper is continuously produced to be supplied in a roll shape, thereby improving working efficiency and productivity. In addition, a coating layer is formed with an olefin-based resin on a surface exposed to the outside of the kraft paper attached to the reinforced kraft paper or polyurethane foam, thereby preventing water or moisture from being absorbed in the kraft paper or polyurethane foam to prevent degradation of the performance.

Description

ROOF DAMPING PAD FOR VEHICLE}

The present invention relates to a roof damping pad for automobiles with reinforced rigidity, and more specifically, to form a reinforced kraft paper integrally by inserting glass fibers impregnated with a thermosetting resin between the kraft papers in the form of a fabric, and forming an olefinic reinforced kraft paper on one side. Reinforced kraft paper coated with resin is integrally formed on at least one side of both sides of the polyurethane foam, so that it is possible to achieve sufficient stiffness reinforcement while minimizing weight gain while achieving light weight reduction and vibration reduction effect. .

In general, the roof panel is equipped with a headliner on the inside of the car to obtain noise performance, vibration, and finishing effects, but since this roof panel is directly exposed to the outside, noise or vibration occurs when it is raining, windy, and driving. There is a risk of entering the vehicle interior through the roof panel.

Thus, the roof panel is equipped with a roof damping pad (or roof pad) to prevent noise or vibration from entering the vehicle interior from the roof panel. Below (Patent Document 1) and (Patent Document 2) discloses a technique related to a loop damping pad that reduces such noise and vibration.

(Patent Document 1) Korean Patent Publication No. 10-1999-0008737

To provide a roof panel that can reduce indoor noise by suppressing vibration of the roof panel by attaching water- or asphalt pad-type damping materials with excellent vibration damping performance to the front of the roof panel except for the roof rail, to suppress vibration of the roof panel. To this end, in a typical roof panel in which a roof rail having both ends fixed to a plurality of reinforcing members is welded, an asphalt pad type damping material is attached to the front surface of the roof panel excluding the roof rail instead of the reinforcing member. . Therefore, according to this, since both ends are fixed to the roof rail welded to the existing roof panel, instead of the reinforcing member attached to the panel surface, an aqueous or asphalt pad type damping material having excellent vibration damping performance is attached to the front surface except the roof rail. Because the number of parts is reduced and the work is easy, the cost can be reduced, and the rigidity is sufficiently reinforced to effectively control the vibration of the roof panel, thereby significantly reducing the noise in the cabin.

(Patent Document 2) Korean Patent Publication No. 10-2014-0131120

By forming a pad through laminating treatment by laminating a waterproof reinforcement paper coated with a PE layer on both sides of the urethane foam pad, while strengthening the rigidity of the vehicle body panel, the pad does not get wet due to condensation, thereby increasing the noise and vibration reduction effect. An object of the present invention is to provide a roof panel pad for a high rigidity vehicle having a waterproof function and a manufacturing method thereof. Accordingly, a method of manufacturing a roof panel pad for a high rigidity vehicle having a waterproof function includes a first step of preparing a rigid urethane foam pad; A second step of preparing a waterproof reinforcement paper with PE layers coated on both sides; A third step of laminating a waterproof reinforcement paper on both sides of the urethane foam pad, and laminating a PE layer in contact with the urethane foam pad to integrally form the urethane foam pad and the waterproof reinforcement paper; And a fourth step of cutting to fit the shape and size of the roof panel. In addition, it includes a roof panel pad for a highly rigid vehicle having a waterproof function manufactured by such a manufacturing method.

On the other hand, such a loop damping pad, as shown in [Fig. 1], while using a lot of polyurethane (1) that has a damping function while reducing vibration, polyurethane (1) is weak in rigidity to compensate for the polyurethane ( It is manufactured by attaching draft paper (2) to both sides of 1). This can secure a certain degree of stiffness compared to the roof damping pad used by padding the existing glass fibers, but has the following problems.

(1) Since glass fiber is applied in a chopping method, there is a problem in that it is vulnerable to moisture like a conventional roof damping pad.

(2) Accordingly, if the air conditioner is operated in the car interior in the summer, dew condensation may occur on the surface of the ceiling, especially polyurethane foam, due to the temperature difference between indoors and outdoors.

(3) Moisture generated by this condensation is absorbed by glass fiber or polyurethane, and acts as one factor that degrades the performance of the loop damping pad.

(4) In addition, although drafts can be secured to some extent when attached to polyurethane, there is a limit to vibration reduction.

(5) On the other hand, when glass fibers are manufactured and used in a chopping method, they cannot be continuously produced, resulting in poor productivity.

(6) And it can be expected to improve the stiffness by about 2 times compared to the existing fiber pad, but there are disadvantages such as the manufacturing process cost and high material cost compared to the fiber pad.

Korean Patent Publication No. 10-1999-0008737 (Publication Date: Feb. 1999) Korean Patent Publication No. 10-2014-0131120 (Publication Date: 2014.11.12)

The present invention takes this point into consideration, and by inserting a glass fiber impregnated with a thermosetting resin in the form of a wick between two sheets of kraft, a reinforced kraft paper is produced, and the reinforced kraft paper is mounted on either side of the polyurethane foam. The purpose of this is to provide a roof damping pad for automobiles with reinforced stiffness that makes it possible to lighten a vehicle as well as obtain vibration and noise improvement effect with glass fiber while reinforcing rigidity with kraft paper.

Particularly, the present invention makes the glass fiber in the form of a fabric, and attaches kraft paper to each side of the glass fiber to produce reinforced kraft paper. Thus, continuous kraft paper can be continuously produced and supplied in roll form, thereby improving work efficiency and productivity. Another object is to provide a roof damping pad for automobiles with reinforced rigidity.

In addition, the present invention forms a coating layer of an olefin resin on the surface exposed to the outside from the kraft paper attached to the reinforced kraft paper or polyurethane foam, so that moisture or moisture is absorbed into the reinforced kraft paper or kraft paper and polyurethane foam and glass fibers. Another object is to provide a roof damping pad for automobiles, which is reinforced with rigidity that prevents deterioration and prevents performance from deteriorating.

A roof damping pad for automobiles with reinforced stiffness according to [Example 1] of the present invention for achieving this object includes a polyurethane foam 10; Kraft paper 20 attached to one side of the polyurethane foam 10; Reinforced kraft paper 30 attached to the other side of the polyurethane foam 10; And a coating layer 40 formed on a surface exposed to the outside of the kraft paper 20 and the reinforced kraft paper 30, wherein the reinforced kraft paper 30 is between two pieces of kraft paper 31. Characterized in that the glass fiber fabric (32) impregnated with a thermosetting resin is integrally formed.

The roof damping pad for automobiles with reinforced rigidity according to [Example 2] of the present invention includes: a polyurethane foam 10; Reinforced kraft paper 30 attached to both sides of the polyurethane foam 10; And a coating layer 40 formed on a surface exposed to the outside of the reinforced kraft paper 30, wherein the reinforced kraft paper 30 is impregnated with a thermosetting resin between two pieces of kraft paper 31. Characterized in that the glass fiber fabric 32 is made integrally.

In particular, the polyurethane foam 10 is characterized in that the thickness is 5 ~ 10㎜, the density is 80 ~ 90㎏ / ㎥.

In addition, the kraft paper 20 is characterized in that the surface density is 80 ~ 100g / ㎡.

And the kraft paper 31 is characterized in that the surface density is 140 ~ 180g / ㎡. In addition, the glass fiber fabric 32 is characterized in that the glass fiber has a surface density of 90 to 110 g / m 2 and a heat density of 115 to 130 g / m 2 when it contains a thermosetting resin.

In addition, the coating layer 40 is characterized in that the olefin-based resin is coated with a surface density of 15 ~ 25g / ㎡.

In addition, the reinforced kraft paper 30 is integrally constituted by spraying and spraying thermosetting resin on both sides of the glass fiber fabric 32, respectively, and then attaching (A) the kraft paper 31, followed by heat pressing. After drying (C) after B), after forming (D) the coating layer 40 on one side, it is characterized in that it is used after being wound on a roller (F) after passing through a calendering process (E).

Finally, the reinforced kraft paper 30 is made of a prepreg glass fiber fabric in a semi-cured state by impregnating and coating a thermosetting resin in a continuous process to the glass fiber fabric 32, wound in roll form, and wound the prepreg glass. It is characterized in that it is wrapped with a kraft paper on one side while unwinding the textile fabric, then heat-pressed and dried, and then rolled on a roller after undergoing a calendering process to finish after forming a coating layer on the other side.

The roof damping pad for a vehicle with reinforced rigidity according to the present invention has the following effects.

(1) Since kraft paper produced by inserting glass fiber impregnated with thermosetting resin between two pieces of kraft paper is used by attaching it to polyurethane foam, stiffness reinforcement with kraft paper and noise and vibration absorption effect with glass fiber can be increased. have.

(2) In particular, since the glass fiber is manufactured in the form of a fabric and sandwiched between kraft papers, the rolls can be wound in a roll form to be continuously supplied between kraft papers, and thus can be automated in a roll form.

(3) With this automation, the working efficiency of the roof damping pad can be increased to increase productivity, thereby reducing manufacturing cost.

(4) On the other hand, on the surface exposed to the outside in the roof damping pad according to the present invention, a coating layer is formed using an olefin resin, respectively, so that moisture or the like permeates crepe paper or reinforced kraft paper and polyurethane foam or glass fiber. Minimizing performance can be reduced.

(5) By applying such reinforced kraft paper, it is possible to obtain sufficient stiffness, vibration and noise improvement effect while minimizing the weight increase of the roof damping pad.

1 is a cross-sectional view showing a layer structure of a conventional roof damping pad with kraft paper attached to both sides of a conventional polyurethane foam.
2 is a cross-sectional view showing a layer structure (a) of a reinforced kraft paper according to [Example 1] of the present invention, and a cross-sectional view showing a loop damping pad structure (b) using the layer structure.
3 is a conceptual diagram schematically showing an apparatus for manufacturing reinforced kraft paper according to [Example 1] of the present invention.
4 is a conceptual view showing a process of attaching a glass fiber fabric to the kraft in the apparatus for manufacturing reinforced kraft paper according to [Example 1] of the present invention.
5 is a photograph showing a state in which a roof damping pad manufactured according to [Example 1] of the present invention is mounted on a vehicle.
Figure 6 is a graph showing the results of the dynamic stiffness test (Dynamic Stiffness) according to the frequency change of the example according to the [Example 1] of the present invention and a comparative example consisting of a conventional polyurethane foam.
7 is a graph showing the results of evaluating the noise level according to the frequency change of the example according to [Example 1] of the present invention and the comparative example consisting of a conventional polyurethane foam.
8 is a cross-sectional view showing a layer structure of a loop damping pad according to [Example 2] of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Prior to this, the terms or words used in the specification and claims should not be construed as being limited to ordinary or lexical meanings, and the inventor may appropriately define the concept of terms in order to describe his or her invention in the best way. According to the principle that it can be interpreted as meanings and concepts consistent with the technical spirit of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in this specification is only one of the most preferred embodiments of the present invention and does not represent all of the technical spirit of the present invention, and various equivalents that can replace them at the time of this application It should be understood that there may be and variations.

Roof damping pads for automobiles with reinforced rigidity according to [Example 1] of the present invention, as shown in [Fig. 2] to [Fig. 7], polyurethane foam 10, both sides of the polyurethane foam 10 Each comprises a kraft paper 20, reinforced kraft paper 30, and a coating layer 40.

In particular, since the reinforced kraft paper 30 is integrally formed by inserting a glass fiber fabric impregnated with a thermosetting resin between two sheets of kraft paper 31, securing rigidity through the kraft paper 31 and the thermosetting resin In addition, noise and vibration performance can be obtained through glass fibers.

At this time, the glass fiber fabric 32 is made of a glass fiber in the form of a fabric, and can be continuously supplied by winding it in a roll form, thereby continuously producing a loop damping pad according to the present invention to increase productivity. will be.

In addition, since the coating layer 40 is configured on both surfaces exposed to the outside of the roof damping pad according to the present invention, it is possible to prevent a performance degradation problem that may occur due to moisture or moisture.

Hereinafter, this configuration will be described in more detail with reference to the accompanying drawings.

<Polyurethane foam>

Polyurethane foam 10, as shown in Figure 2, is a mixture of polyol and diisocyanate, and is made of a conventional technique made of a porous material in the form of a sponge. In particular, it is known that the polyurethane foam 10 has excellent noise performance, high insulation, and excellent electrical insulation.

It is preferable that the polyurethane foam 10 has a thickness of 5 to 10 mm and a density of 80 to 90 kg / m 3. Most preferably, it is best to use those having a thickness of 7 mm and a density of 80 to 90 kg / m 3.

< Kraft paper >

Kraft Paper 20 is made of unbleached kraft pulp as the main raw material, as shown in [FIG. 2], and manufactured by a conventional technique used for packaging cement, flour, fertilizer and feed. use. Accordingly, kraft paper is known to be superior to other papers in tensile strength, tear strength, and elongation, because the contents of the package should not burst.

The kraft paper 20 is for reinforcing the stiffness of the roof damping pad according to the present invention, and can be used as long as it can reinforce the stiffness. Thus, the kraft paper 20 is most preferably used having a surface density of 80 ~ 100g / ㎡.

<Enhance Kraft paper >

Reinforced kraft paper 30, as shown in Figure 2, is made to reinforce the rigidity with two pieces of kraft paper 31, and also to obtain vibration and noise performance using glass fibers.

Here, the kraft paper 31 is produced in the same way as the kraft paper 20 described above, but has a difference in surface density. That is, the kraft paper 20 described above uses a surface density of 80 to 100 g / m 2, but the kraft paper 31 used in the reinforced kraft paper 30 uses a surface density of 140 to 180 g / m 2.

On the other hand, between the above-described two pieces of kraft paper 31, as shown in [Fig. 2] to [Fig. 4], the glass fiber fabric 32 is inserted to form integrally.

Here, the glass fiber fabric 32 is made of glass fiber which is known to be effective in noise and vibration, and in particular, can be integrally attached by inserting the glass fiber in the form of a fabric and inserting it between two pieces of kraft paper 31. It is possible.

In a preferred embodiment of the present invention, it is preferable to fabricate the glass fiber fabric 32 so as to reinforce the rigidity of the glass fiber fabric 32 by impregnating a thermosetting resin.

It is preferable that the glass fiber fabric 32 made as described above has a glass fiber having a surface density of 90 to 110 g / m 2 and a glass fiber fabric 32 containing a thermosetting resin having a surface density of 115 to 130 g / m 2.

Reinforced kraft paper 30 made of such a configuration, as shown in [FIG. 2 (a)] to [FIG. 3], impregnating the thermosetting resin by spraying sprays on both sides of the glass fiber fabric 32, and impregnating the thermosetting resin. Crafted by attaching kraft paper 31 to both sides of the impregnated glass fiber fabric 32, respectively.

To explain this in more detail, as shown in "A" and [Fig. 4] of [Figure 3], the glass fiber fabric 32 is made of a glass fiber and is wound in a roll, and the glass fiber fabric 30 ), Spray the thermosetting resin on both sides. Then, kraft paper 31 is attached to both sides of the glass fiber fabric 32 to temporarily attach the reinforced kraft paper 30.

Subsequently, as shown in “B” of FIG. 3, heat is applied while pressing the reinforced kraft paper 30 temporarily attached by a press to be integrally attached. And the reinforced kraft paper 30, which is integrally attached by applying heat as described above, cools the heat while passing through the dry parts as shown in “C” in FIG. 3, and then forms a coating layer 40 to be described later.

On the other hand, such a reinforced kraft paper 30, as shown in [Fig. 3] and [Fig. 4], it is possible to attach the kraft paper 31 by a spray injection method, the glass fiber fabric 32 is produced in a prepreg form By winding it on a roll and then unwinding the prepreg glass fiber fabric, it is also possible to form a kraft paper attachment and coating layer in the same way as described above. The technology related to this is the same as in the process of manufacturing the above-mentioned reinforced kraft paper 30 except for the process of making a prepreg glass fiber fabric in a semi-cured state by impregnating and coating a thermosetting resin, and thus detailed description thereof is omitted here. do.

<Coating layer>

The coating layer 40, as shown in [Fig. 2] and [Fig. 3], on one side of the reinforced kraft paper 30 cooled by thermal compression as described above, that is, on either side of the two pieces of kraft paper 31 To form.

The coating layer 40 is a component constituting the outer surface of the above-described polyurethane 10, that is, by coating on both the above-described kraft paper (20, 31), moisture or moisture is impregnated into this polyurethane foam or glass fiber Therefore, it is possible to prevent condensation from occurring.

In a preferred embodiment of the present invention, the coating layer 40 is most preferably coated with an olefin-based resin having a surface density of 15-25 g / m 2.

The coating layer 40, as shown in "D" in [Fig. 3], the reinforced kraft paper 30 formed by integrally forming and cooling the glass fiber fabric 32 impregnated with a thermosetting resin between two pieces of kraft paper 31 ).

In the drawings, the reference numeral "E" represents a calendering process for forming a corti layer 40 on the surface of the reinforced kraft paper 30 and then finishing it, and "F" is a roll of the finished reinforced kraft paper 30. Each winding process is shown.

The present invention made as described above can increase the causticity of the loop damping pad through kraft paper, and reinforced kraft paper composed of kraft paper and a glass fiber fabric impregnated with a thermosetting resin, as well as noise through polyurethane foam and glass fiber. Performance and vibration performance can be improved together.

On the other hand, the dynamic damping pad (Dynamic Stiffness) evaluation and driving evaluation results of the loop damping pad and the comparative example according to the present invention made as follows. Here, the roof damping pad according to the present invention is an embodiment in which a reinforced scrap paper without impregnating a thermosetting resin is adhered to one side, as shown in FIG. 5, a glass fiber fabric is applied, and a comparative example is made of polyurethane. It was produced.

< Donggang Province  Evaluation>

The dynamic stiffness evaluations of Examples and Comparative Examples are as shown in [Fig. 6] below. In FIG. 6, the horizontal axis represents frequency (주파수), the vertical axis represents dynamic stiffness [(m / s ² ) / N], the red line represents the dynamic stiffness graph of the example, and the black line represents the dynamic stiffness graph of the comparative example, respectively. .

As a result, as shown in [Fig. 6], it can be seen that the embodiment of the red line has improved dynamic stiffness in the entire frequency range than the graph of the black line, and in particular, the effect of strengthening the stiffness of the roof panel locally up to 3 times is obtained You can see that

On the other hand, when the reinforced kraft paper is attached to both sides according to the present invention, there is a stiffness reinforcement effect of about 4 times. This has a superior stiffness and noise improvement effect compared to the existing fiber pads, and has better performance than the recent polyurethane pads, but cannot satisfy the level that can replace the rigid reinforcement frame or vibration damper applied to automobiles. Therefore, when manufacturing rigid kraft paper, the glass fiber is impregnated with a thermosetting resin, and the curing reaction is performed by heat of the drying process to reinforce the rigidity. Thus, when applying the reinforced kraft paper produced in this way, the roof damping pad has a 5 times stiffness reinforcement effect, which is similar to the vibration damping performance, and can be replaced with a vibration damping material because the maximum weight can be reduced to about 1,100 g / m ² . have.

In addition, through the olefin-based resin coating on the outer surface of each kraft paper, it is possible to prevent the degradation of product performance due to condensation, thereby ensuring durability, and the important kraft reinforcement layer of this pad can be continuously produced in a single manufacturing process, thus making the manufacturing process It can be simplified.

<Riding evaluation>

When the vehicle equipped with the example and the comparative example travels on the model road, the driving evaluation in which the noise level according to the change in frequency is evaluated is as shown in FIG. 7 below. In FIG. 7, the horizontal axis represents frequency (Hz), the vertical axis represents noise level [dB (A)], the red line represents the noise level graph of the example, and the black line represents the noise level graph of the comparative example.

As a result, as shown in FIG. 7, when the frequency is 350 kHz or less, the noise level of the example and the comparative example is almost the same, but in the region of the frequency of 350 to 700 kHz, the comparative example is 66.6 dB (A) on average, and the example is It can be seen that the decrease was about 2dB (A) to 64.6dB (A).

The roof damping pad for automobiles with reinforced stiffness according to [Example 2] of the present invention is different from the configuration of [Example 1] described above or the configuration of reinforced kraft paper 30 as shown in FIG. 8. There is.

That is, in [Example 2], reinforced kraft paper 30 is attached to both sides of the above-described polyurethane foam 10, as shown in FIG. 8, to be integrally formed. In addition, the coating layer 40 is formed on the outer surface of each of the reinforced kraft paper 30, that is, the surface exposed to the outside, as in [Example 1].

Accordingly, [Example 2] is different from [Example 1], in which kraft paper 20 and reinforced kraft paper 30 are integrally formed on both sides with polyurethane foam 10 as the center, polyurethane foam 10 Since the reinforced kraft paper 30 is integrally formed on both sides of the center, it is possible to further enhance vibration and noise performance in addition to strengthening the rigidity.

10: polyurethane foam
20: kraft paper
30: reinforced kraft paper
31: kraft paper
32: fiberglass fabric
40: coating layer

Claims (9)

Polyurethane foam 10; Kraft paper 20 attached to one side of the polyurethane foam 10; Reinforced kraft paper 30 attached to the other side of the polyurethane foam 10; And a coating layer 40 formed on a surface exposed to the outside of the kraft paper 20 and the reinforced kraft paper 30;
The reinforced kraft paper 30,
A roof damping pad for automobiles with reinforced stiffness, characterized in that the glass fiber fabric (32) impregnated with a thermosetting resin is integrally formed between two pieces of kraft paper (31).
Polyurethane foam 10; Reinforced kraft paper 30 attached to both sides of the polyurethane foam 10; And a coating layer 40 formed on a surface exposed to the outside of the reinforced kraft paper 30;
The reinforced kraft paper 30,
A roof damping pad for automobiles with reinforced stiffness, characterized in that the glass fiber fabric (32) impregnated with a thermosetting resin is integrally formed between two pieces of kraft paper (31).
In claim 1 or 2,
The polyurethane foam 10,
The thickness is 5 ~ 10㎜,
A roof damping pad for automobiles with reinforced stiffness, characterized by a density of 80 to 90 kg / m 3.
In claim 1,
The kraft paper 20,
A roof damping pad for automobiles with reinforced stiffness, characterized by a surface density of 80 to 100 g / m2.
In claim 2,
The kraft paper 31,
A roof damping pad for automobiles with reinforced stiffness, characterized by a surface density of 140 to 180 g / m2.
In claim 1 or 2,
The glass fiber fabric 32,
The glass fiber has a surface density of 90 to 110 g / m2,
A roof damping pad for automobiles with reinforced stiffness characterized by having a surface density of 115 to 130 g / m 2 when a thermosetting resin is contained.
In claim 1 or 2,
The coating layer 40,
A roof damping pad for automobiles with reinforced stiffness, characterized by coating an olefin resin with a surface density of 15 to 25 g / m2.
In claim 1 or 2,
The reinforced kraft paper 30,
After spraying a thermosetting resin on both sides of the glass fiber fabric 32, then attaching (A) each of the kraft paper 31, and then heat-pressing it to be integrally configured (B) and then drying (C). , A roof damping pad for automobiles with reinforced stiffness, characterized in that a coating layer (40) is formed on one side (D) and then wound on a roller (F) after passing through a calendering process (E).
In claim 1 or 2,
Reinforced kraft paper 30,
The glass fiber fabric 32 is impregnated and coated with a thermosetting resin in a continuous process to prepare a prepreg glass fiber fabric in a semi-cured state, wound in a roll form, and unwound the prepreg glass fiber fabric wound thereon, with kraft paper on one side. A roof damping pad for automobiles with reinforced stiffness, characterized by being rolled up, dried after being pressurized, and then rolled on a roller after passing through a calendering process to form a coating layer on the other side.

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