KR20230068860A - Manufacturing appartus and method for eco-friendly sound absorption pad - Google Patents

Abstract

The present invention relates to an apparatus and a method for manufacturing an eco-friendly sound absorption pad, which comprises: a web forming unit using raw materials to form a web; a wrapping unit overlapping a plurality of formed webs to form a plurality of layers to correspond to the weight and thickness of a product to form non-woven fabric with a three-dimensional structure; a binding unit applying heat to and compressing the webs constituting the non-woven fabric to have binding force and then melting the low-melting-point fiber mixed with raw materials to bind each web; and a winding unit winding up the bound non-woven fabric, wherein the wrapping unit is arranged to stand upright in a vertical direction while the plurality of webs are overlapped in the vertical direction and an upper surface web and a lower surface web are attached respectively to an upper part and a lower part of the web arranged in the vertical direction to form the non-woven fabric of 3D structure, which has a plurality of layers, so the eco-friendly sound absorption pad to be applied to a future eco-friendly vehicle to effectively absorb a road noise within a low frequency band and a motor noise within a high frequency band can be provided.

Description

Eco-friendly sound-absorbing pad manufacturing apparatus and method {MANUFACTURING APPARTUS AND METHOD FOR ECO-FRIENDLY SOUND ABSORPTION PAD}

The present invention relates to an apparatus and method for manufacturing an eco-friendly sound-absorbing pad, and more particularly, to an apparatus and method for manufacturing an eco-friendly sound-absorbing pad used as an interior material of a vehicle.

In general, automobile interior materials mainly use cloth, non-woven fabric, PVC (Poly Vinyl Chloride), and the like, and the components of these interior materials are cloth and non-woven fabric. Polyester is used, and polyvinyl chloride is used as the PVC sheet.

These interior materials are attached to the vehicle by being adhered to a substrate layer molded into various shapes according to the shape of the interior of the vehicle.

Here, most of the interior materials are sometimes bonded to the base material alone, but most of the interior materials are produced through a process of attaching a sound absorbing material or a cushioning material to the back surface of the interior materials and molding them together with the base material.

That is, a sound absorbing pad provided inside the vehicle to block noise of various machines is applied to the interior material of the vehicle.

Polyurethane foam, which is the most widely used material as a conventional sound-absorbing material, is a different component from the interior material, and in order to be used for recycling, the interior material and the cushion material must be separated, but it is virtually impossible to separate from the interior material.

In addition, the polyurethane foam has a problem in that it is gradually decomposed and broken when a certain period of time elapses or when exposed to direct sunlight for a long time.

In addition, when polyurethane foam is used as a car interior material, it absorbs a certain amount of moisture inside the car, and when the temperature inside the car rises, the absorbed water is released to prevent fogging on the interior glass surface of the car, which hinders driving. was also provided.

In addition, when molding polyurethane, due to a partial difference in density of the expanded foam, a low-density region was pressed against a mold and a defect occurred.

In addition, polyurethane has many problems such as generation of a large amount of toxic gas due to combustion during a vehicle fire, a large amount of volatile organic compounds (VOC), and deterioration of the working environment due to isocyanate during block foaming work.

In order to improve these problems, research is being conducted to develop various types of materials to replace polyurethane foam.

Patent Document 1 and Patent Document 2 below disclose a suction pad technology for automobiles according to the prior art.

For example, in order to replace polyurethane foam, a technique of applying a silky nonwoven fabric has been proposed.

The silk nonwoven fabric has advantages such as price competitiveness, excellent durability such as appearance performance, recyclability, and good air permeability.

On the other hand, compared to polyurethane foam, the silky nonwoven fabric has problems such as poor part moldability, low compressive modulus, low weight in the same volume, and low sound absorption efficiency.

On the other hand, in recent years, due to environmental problems such as carbon emissions, future eco-friendly vehicles such as electric vehicles to replace internal combustion engine vehicles have been commercialized.

In the internal combustion engine vehicle, blocking engine noise in the low frequency region (400 Hz to 1000 Hz) was an important factor for the sound absorbing material, but in the electric vehicle, the high frequency region ( 2 kHz to 10 kHz) is essential to block motor noise.

According to such a change in the noise source, it is necessary to change the sound absorbing pad to absorb both the noise in the low frequency region and the high frequency region.

Accordingly, there is a demand for the development of an eco-friendly sound-absorbing pad that can be applied to future eco-friendly vehicles to improve sound absorption efficiency and contribute to fuel efficiency improvement through weight reduction.

Republic of Korea Patent Publication No. 10-2013-0060677 (published on June 10, 2013) Korean Patent Publication No. 10-2087829 (published on March 11, 2020)

An object of the present invention is to solve the above problems, and to provide an eco-friendly sound-absorbing pad manufacturing apparatus and method that can effectively absorb road noise in a low frequency region and motor noise in a high frequency region when applied to future eco-friendly vehicles. .

Another object of the present invention is to provide an apparatus and method for manufacturing an eco-friendly sound-absorbing pad capable of adjusting the thickness and weight according to the object to which the sound-absorbing pad is applied.

Another object of the present invention is to provide an eco-friendly sound-absorbing pad manufacturing apparatus and method capable of satisfying elasticity and mechanical strength after molding parts and imparting eco-friendliness.

In order to achieve the above object, the eco-friendly sound-absorbing pad manufacturing apparatus according to the present invention is a web forming unit for forming a web using raw materials, and a plurality of formed webs overlapped to correspond to the weight and thickness of the product. A lapping part that forms layers to form a three-dimensional non-woven fabric, a binding part that binds each web by applying heat and compressing the webs formed of non-woven fabric to have binding force, and melting the low-melting fiber mixed with the raw material, and bound non-woven fabric. A winding unit for winding a plurality of webs, wherein the lapping unit arranges a plurality of webs in a vertical direction in an overlapping state, and attaches upper and lower surfaces to the upper and lower surfaces of the vertically arranged webs, respectively, to have a plurality of layers. It is characterized in that it is molded into a three-dimensional nonwoven fabric.

In addition, in order to achieve the above object, the eco-friendly sound-absorbing pad manufacturing method according to the present invention is (a) forming a web using raw materials in the web forming unit, (b) the weight and thickness of the product in the lapping unit Forming a three-dimensional nonwoven fabric by overlapping a plurality of molded webs to form a plurality of layers to correspond to, (c) Applying heat and compressing the webs formed of nonwoven fabric in the binding unit to have binding force and mixing with the raw material A step of melting the low-melting fiber to bind each web and (d) a step of winding the bound nonwoven fabric in a winding unit, wherein in the step (b), the lapping unit vertically overlaps a plurality of webs in a vertical direction It is characterized in that it is formed into a three-dimensional nonwoven fabric having a plurality of layers by attaching the upper and lower surfaces to the upper and lower portions of the vertically arranged webs, respectively.

As described above, according to the eco-friendly sound-absorbing pad manufacturing apparatus and method according to the present invention, it is possible to manufacture an eco-friendly sound-absorbing pad that can effectively absorb road noise in the low-frequency region and motor noise in the high-frequency region by being applied to future eco-friendly vehicles. effect is obtained.

And according to the present invention, the thickness and weight of the nonwoven fabric having a three-dimensional structure can be adjusted by adjusting the left and right moving distance of the moving guide and adjusting the conveying speed of the upper and lower net conveyors according to the target to which the sound absorbing pad is applied. is obtained

In addition, according to the present invention, the effect of satisfying elasticity and mechanical strength after molding parts and imparting eco-friendliness is obtained.

1 is a configuration diagram of an eco-friendly sound-absorbing pad manufacturing apparatus according to a preferred embodiment of the present invention;
2 is a configuration diagram of a vertical wrapping unit according to the prior art;
3 is a configuration diagram of the lapping unit shown in FIG. 1;
4 is a detailed configuration diagram of the wrapping unit shown in FIG. 3;
Figure 5 is a process chart explaining the manufacturing method of the eco-friendly sound-absorbing pad manufacturing apparatus according to a preferred embodiment of the present invention step by step.

Hereinafter, an eco-friendly sound-absorbing pad manufacturing apparatus and method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an eco-friendly sound-absorbing pad manufacturing apparatus according to a preferred embodiment of the present invention.

Hereinafter, terms indicating directions such as 'left', 'right', 'front', 'rear', 'upper' and 'downer' are defined as indicating each direction based on the state shown in each drawing. do.

Eco-friendly sound-absorbing pad manufacturing apparatus 10 according to a preferred embodiment of the present invention, as shown in Figure 1, a web forming unit 11 for forming a web using raw materials, molding to correspond to the weight and thickness of the product, A lapping unit 12 that forms a three-dimensional nonwoven fabric by overlapping a plurality of webs to form a plurality of layers, heats and compresses the webs formed of the nonwoven fabric to have a binding force, and melts the low-melting fiber mixed with the raw material It includes a binding unit 13 for binding the respective webs and a winding unit 15 for winding the bound nonwoven fabric.

In addition, the eco-friendly sound-absorbing pad manufacturing apparatus 10 according to a preferred embodiment of the present invention cuts the bound nonwoven fabric to a preset width and length and transfers it to the winding unit 15, or the nonwoven fabric wound around the winding unit 15 It may further include a cutting unit 14 for cutting.

The web forming unit 11 includes an opening unit 21 that releases and inflates the compressed and tangled fibers of each raw material, a blending unit 22 that mixes various types of raw cotton to have uniform quality, and short fibers and After removing impurities and separating individual fibers, a carding unit 23 may be included to prepare a sliver in a rope state stretched in parallel.

Here, each raw material used as a raw material is a synthetic resin material that has sound absorption in the high frequency region and can be recycled, such as polyurethane (Poly Uretane, PU), polyethylene terephthalate (PET), or polyester (Poly Ester, PE). It may be provided with fibers such as silk.

For example, in the present embodiment, PET having high elasticity and low melt temperature fiber are used as raw materials, and the web forming part 11 contains about 60% to 70% by weight of PET and about 30% by weight. to 40% by weight of the low-melt fiber may be mixed to form a web.

Such a raw material may be configured to increase the frictional area by forming a hollow inside the fiber to maximize the surface area in order to convert the sound energy generated by the vehicle into heat energy by generating heat by friction.

To this end, the raw material may be spun through a spinneret designed to maximize the diffuse reflectance by minimizing the sine curve of the frequency and pitch of the noise wave.

The wrapping unit 12 is a nonwoven fabric having a three-dimensional structure having a plurality of layers by arranging a plurality of webs in a vertical direction in an overlapping state, and attaching upper and lower webs to the upper and lower portions of the vertically arranged webs, respectively. can be molded.

The configuration of the wrapping unit 12 will be described in detail with reference to FIGS. 2 to 4 below.

On the other hand, in this embodiment, it is possible to bind by melting the low-melting fiber at a low temperature of about 50 ° C. or less without a needle punching (needle punching) process applied to a general nonwoven fabric manufacturing process.

That is, the binding unit 13 may bind the nonwoven fabric formed into a three-dimensional structure by applying a preset low-temperature heat and compressing the low melting point fibers included in the raw material to melt the webs to be formed into the nonwoven fabric to have binding force.

As such, the present invention can prevent peeling of a web forming a nonwoven fabric by binding using pure low-melting fibers without a needle punching process, and can solve quality problems such as dust generated in the needle punching process.

The cutting unit 14 can cut the molded nonwoven fabric to a desired width and length by driving the cutter according to a control signal from a control unit (not shown) that controls the driving of each device provided in the eco-friendly sound-absorbing pad manufacturing apparatus 10. there is.

The winding unit 15 winds the cut nonwoven fabric around a winding roll, and the nonwoven fabric is supplied to a seat manufacturing apparatus of a vehicle in a state where it is wound around the winding roll, so that a sound absorbing pad having a preset standard may be manufactured.

Next, the configuration of the wrapping unit 12 will be described in detail in contrast to the prior art with reference to FIGS. 2 to 4 .

2 is a configuration diagram of a vertical wrapping unit according to the prior art, FIG. 3 is a configuration diagram of the wrapping unit shown in FIG. 1 , and FIG. 4 is a detailed configuration diagram of the wrapping unit shown in FIG. 3 .

As shown in FIG. 2, the vertical wrapping unit 1 according to the prior art uses a feed drum 2 and a conveyor 3 to fold a web 4 into a folding element 5 having a plurality of blades formed on its outer circumferential surface. supplied and arranged in a vertical direction.

Here, in the vertical wrapping unit 1 according to the prior art, a wire guide 6 fixed in a wire type is installed to guide the web 4 to be erected and arranged in a vertical direction.

The vertical wrapping unit 1 according to the prior art configured as described above has a limitation in increasing the height of the vertically arranged web as the length of the blade is limited.

For this reason, the sound absorbing pad manufacturing apparatus to which the vertical wrapping unit 1 according to the prior art is applied has problems in that it is difficult to increase the thickness and weight of the nonwoven fabric for manufacturing the sound absorbing pad, and the sound absorbing performance is limited.

On the other hand, in the present embodiment, the wrapping unit 12 uniformly forms a web using a double waveguide structure, attaches nonwoven fabrics to the upper and lower surfaces of the nonwoven fabrics arranged in the vertical direction, and manufactures a three-dimensional nonwoven fabric. It is possible to adjust the height of the web, that is, the thickness and weight of the nonwoven fabric, which is arranged vertically according to the specifications of the eco-friendly sound-absorbing pad.

In detail, as shown in FIGS. 3 and 4 , the wrapping unit 12 includes an upper waveguide 31 and a lower waveguide that form a plurality of layers by double waveguide the web 30 that has undergone the carding process. (32), a transfer conveyor 33 for transporting the double waveguided webs 30 overlapped in a plurality of layers, and a wrapping unit 34 for vertically arranging the webs 30 supplied by the transfer conveyor 33 in a vertical direction. And an upper net conveyor 37 and a lower net conveyor 38 for supplying and attaching the upper and lower webs 35 and 36 to the upper and lower surfaces of the webs 30 arranged in a vertical direction, respectively. can

The upper waveguide 31 and the lower waveguide 32 each double waveguide the web 30 that has undergone the carding process, and the double waveguide webs 30 may overlap each other to form a plurality of layers.

Here, the web 30 is moved by a moving guide (not shown) that moves in the forward and backward directions and is overlapped in a plurality of layers on one side by the horizontal portion 331 of the conveyor 33, as seen in FIG. move in the left direction when

In addition, the web 30 is transferred upward to the left by the inclined portion 331 of the transfer conveyor 33 and then vertically downward to the wrapping unit 34 in the process of being transferred to and from the left and right directions provided with a moving guide ( 341), it is repeatedly moved and overlapped with a plurality of layers.

The movement guide 341 can move back and forth in the left and right directions by the driving module installed on the upper part of the wrapping part 12 .

The driving module includes a driving motor and a double link, and the double link rotates the plate on which both ends of the movement guide 341 are installed around a rotation axis installed on top of the plate to move the movement guide 341 left and right. can be moved in either direction.

Thus, the web 30 is continuously stacked with a predetermined width in the stacking space 342 provided under the moving guide 341 .

In addition, the wrapping unit 34 may further include a blower 343 for blowing air toward the web 30 moving downward according to a control signal from the control unit.

That is, the blower 341 blows air to the descending web 30 to maintain the web at constant temperature and humidity, and can remove static electricity generated from the web 30 .

On the other hand, the web 30 stacked under the stacking space 342 is arranged in a vertical direction on the upper surface of the lower web 36 supplied by the lower net conveyor 38 disposed below the transfer conveyor 33 do. That is, when the webs 30 are continuously stacked and stacked in the left and right directions on the stacking space based on the lower end of the stacking space 243, the arrangement direction is switched so that the webs 30 stand vertically on the upper surface of the web 36.

Then, the upper surface web 35 is supplied by the upper net conveyor 37 to the upper surface of the web 30 arranged in an upright state.

So, the vertically arranged web 30 is supplied to the binding unit 13 in a state where the bottom web 36 and the top web 35 are arranged on the lower and upper surfaces, respectively, and then mixed with the raw material in a preset low temperature state. As the low-melting fibers are melted and the webs are bound to each other, a three-dimensional nonwoven fabric can be produced.

Here, the upper web 35 and the lower web 36 may each be provided with a light weight nonwoven fabric manufactured using a synthetic resin material such as PET.

On the other hand, the wrapping unit 12 can adjust the thickness and weight of the nonwoven fabric by adjusting the supply speed of the upper and lower webs 35 and 36 respectively supplied to the upper and lower surfaces of the vertically arranged webs 30. there is.

That is, when the horizontal movement distance of the movement guide 341 increases, the horizontal width of the webs 30 stacked in the stacking space 342, that is, the thickness and weight of the webs 30 arranged vertically increase. do.

And if the conveying speed of the upper net conveyor 37 and the conveying speed of the lower net conveyor 38 are the same, the web 30 disposed between the upper web 35 and the lower web 36 will maintain a vertically erected state. can

On the other hand, if the conveying speed of the upper net conveyor 37 is faster than that of the lower net conveyor 38, the web 30 is arranged in an inclined state so that the upper end is toward the left side than the lower end.

Therefore, in this embodiment, the control unit adjusts the conveying speed of the upper net conveyor 37 and the lower net conveyor 38 differently from each other to control the vertically arranged webs 30 to be obliquely overlapped.

As described above, the present invention can absorb noise and increase the compressive elasticity and sound absorption for damping vibration by arranging the web stacked with a plurality of layers in a state inclined to one side using the lapping part.

In addition, the present invention can improve the surface appearance and solve the quality problem caused by the generation of dust by attaching the upper and lower surfaces of the web laminated in a plurality of layers, respectively.

Next, with reference to FIG. 5, a method of manufacturing an eco-friendly sound-absorbing pad manufacturing apparatus according to a preferred embodiment of the present invention will be described in detail.

Figure 5 is a process chart explaining step by step the manufacturing method of the eco-friendly sound-absorbing pad manufacturing apparatus according to a preferred embodiment of the present invention.

In step S10 of FIG. 5, the open surface portion 21 of the web forming unit 11 releases and inflates the compressed and entangled fibers of each raw material for manufacturing an eco-friendly sound-absorbing pad, and the mixed surface portion 22 mixes several types of raw cotton to ensure uniform quality.

Here, the raw material may be prepared by mixing PET having high elasticity and low melting fiber.

In step S12, the carding unit 23 removes short fibers and impurities remaining in the raw cotton, separates individual fibers, and then manufactures a sliver in a rope state stretched in parallel.

Then, the lapping unit 12 arranges the plurality of webs 30 in the vertical direction in a state of overlapping them vertically, and the upper and lower surfaces of the vertically arranged webs 30 are provided with upper and lower webs 35 and 36, respectively. is attached to form a three-dimensional nonwoven fabric having a plurality of layers.

To this end, the upper waveguide 31 and the lower waveguide 32 of the lapping unit 12 double waveguide the web 30 that has undergone the carding process to form a plurality of layers by overlapping each other, and the moving guide 341 After reciprocating in the left and right directions by the drive module and rising by the inclined portion 332 of the transfer conveyor 33, the vertically descending web 30 is stacked with a preset width (S14). At this time, the blower 343 blows air to the descending web 30 to maintain the web at constant temperature and humidity, and can remove static electricity.

The lower net conveyor 38 supplies the bottom web 36 to the lower part of the stacked web 30 (S16). Then, the stacked webs 30 are arranged in a vertically erected state by the movement of the lower web 36 (S18).

In step S20, the upper net conveyor 37 supplies the upper surface web 35 to the upper surface of the vertically arranged web 30.

At this time, the controller controls the conveying speed of the upper net conveyor 37 to be faster than the conveying speed of the lower net conveyor 38 .

Then, the vertically arranged web 30 is tilted to the left along the conveying direction at the upper end (S22).

In step S24, the binding unit 13 melts the low-melting fiber mixed with the raw material by compressing and applying preset low-temperature heat to the web 30 having a plurality of layers arranged at an angle without a needle punching operation, thereby forming the respective webs with each other. By binding, a three-dimensional nonwoven fabric having a pre-determined thickness is molded.

In step S26, the cutting unit 14 drives the cutter according to the control signal of the control unit to curd the molded nonwoven fabric to a desired width and length, and in step S28, the winding unit 15 winds the cut nonwoven fabric around a take-up roll.

The non-woven fabric wound on the winding roll is supplied to a seat manufacturing device of a vehicle and manufactured as a sound absorbing pad of a preset standard (S30).

Through the process as described above, the present invention can be applied to future eco-friendly vehicles to manufacture an eco-friendly sound-absorbing pad capable of effectively absorbing road noise in a low frequency region and motor noise in a high frequency region.

And the present invention can adjust the thickness and weight of the nonwoven fabric having a three-dimensional structure by adjusting the left and right movement distance of the moving guide and adjusting the conveying speed of the upper and lower net conveyors according to the target to which the sound-absorbing pad is applied.

In addition, the present invention can satisfy elasticity and mechanical strength after molding a part, and can impart eco-friendliness.

That is, the present invention can standardize the thickness and weight of the nonwoven fabric by arranging the vertically arranged webs at a predetermined angle, for example, at an angle of about 30° to 45° to produce a three-dimensional nonwoven fabric.

In addition, the present invention can improve the sound absorption and resilience of the sound absorbing pad, and improve eco-friendliness by using recyclable raw materials.

Although the invention made by the present inventors has been specifically described according to the above embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention.

The present invention is applied to an eco-friendly sound-absorbing pad manufacturing apparatus and manufacturing method technology that can effectively absorb road noise in a low-frequency region and motor noise in a high-frequency region by being applied to future eco-friendly vehicles.

1: vertical wrapping unit 2: feed drum
3: conveyor 4: web
5: folding element 6: wire guide
10: Eco-friendly sound-absorbing pad manufacturing device
11: non-woven fabric forming unit 12: wrapping unit
13: binding part 14: cutting part
15: winding unit
21: open surface portion 22: mixed surface portion
23: somen part
30: Web
31, 32: upper and lower waveguides
33: transfer conveyor
331: horizontal part 332: inclined part
34: wrapping unit
341: movement guide 342: stacking space
343: blower
35, 36: upper surface, lower surface web
37, 38: upper and lower net conveyors

Claims (8)

A web forming unit for forming a web using raw materials;
A wrapping unit for forming a three-dimensional nonwoven fabric by forming a plurality of layers by overlapping a plurality of molded webs to correspond to the weight and thickness of the product;
A binding unit that binds each web by applying heat and compressing the webs formed of non-woven fabric to have binding force to melt the low-melting fiber mixed with the raw material, and
Including a winding unit for winding the bound nonwoven fabric,
The lapping unit arranges a plurality of webs in the vertical direction in an overlapping state, and attaches the upper and lower webs to the upper and lower portions of the vertically arranged webs, respectively, to form a three-dimensional nonwoven fabric having a plurality of layers. Eco-friendly sound-absorbing pad manufacturing apparatus characterized by. The method of claim 1, wherein the wrapping unit
An upper waveguide and a lower waveguide for forming a plurality of layers by double waveguide the web that has undergone the carding process;
A transfer conveyor that transfers a double-guided web overlapped with a plurality of layers;
A wrapping unit for arranging the web supplied by the transfer conveyor in a vertical direction, and
Eco-friendly sound-absorbing pad manufacturing apparatus, characterized in that it comprises an upper net conveyor and a lower net conveyor for supplying and attaching the upper and lower webs, respectively, to the upper and lower surfaces of the webs arranged in a vertical direction. According to claim 2,
The wrapping unit includes a moving guide that reciprocates by the driving force of the driving module,
Characterized in that the movement guide continuously laminates the web in a stacking space having a preset width by repeatedly moving the web transferred vertically downward after being transferred upward by the inclined portion of the transfer conveyor in the left and right directions. Eco-friendly sound-absorbing pad manufacturing device. According to claim 3,
The control unit controls the conveying speed of the upper net conveyor and the lower net conveyor so that the vertically arranged web is inclined by a preset angle. (a) forming a web using raw materials in a web forming unit;
(b) forming a three-dimensional nonwoven fabric by forming a plurality of layers by overlapping a plurality of molded webs to correspond to the weight and thickness of the product in the wrapping unit;
(c) binding each web by applying heat and compressing the webs formed of non-woven fabric in the binding unit to have binding force and melting the low-melting fiber mixed with the raw material, and (d) winding the bound non-woven fabric in the winding unit contains steps,
In the step (b), the lapping unit arranges a plurality of webs in the vertical direction in a state of overlapping them vertically, and attaches the upper and lower surfaces to the upper and lower surfaces of the vertically arranged webs, respectively, to form a three-dimensional nonwoven fabric having a plurality of layers Eco-friendly sound-absorbing pad manufacturing method, characterized in that for molding. The method of claim 5, wherein step (b)
(b1) double waveguide the molded web using upper and lower waveguides to form a plurality of layers;
(b2) arranging the web supplied by the transfer conveyor in the wrapping unit in a vertical direction; and
(b3) driving the upper net conveyor and the lower net conveyor to supply the upper and lower webs to the upper and lower surfaces of the webs arranged in a vertical direction, respectively. According to claim 6,
In the step (b2), the wrapping unit is transferred upward on one side by the inclined portion of the transfer conveyor, and then repeatedly moves the web transferred vertically downward using a movement guide in the left and right directions, thereby forming a stacking space having a preset width. Eco-friendly sound-absorbing pad manufacturing method, characterized in that continuously laminated on. According to claim 7
In the step (b3), the upper net conveyor and the lower net conveyor are eco-friendly sound-absorbing pad manufacturing method, characterized in that the conveying speed is adjusted so that the vertically arranged webs are arranged inclined at a predetermined angle.

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