CN113524849B - Machine cover sound insulation pad and preparation method and application thereof - Google Patents
Machine cover sound insulation pad and preparation method and application thereof Download PDFInfo
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- CN113524849B CN113524849B CN202110823572.XA CN202110823572A CN113524849B CN 113524849 B CN113524849 B CN 113524849B CN 202110823572 A CN202110823572 A CN 202110823572A CN 113524849 B CN113524849 B CN 113524849B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
- B60R13/0838—Insulating elements, e.g. for sound insulation for engine compartments
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/003—Interior finishings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/08—Cars
Abstract
The invention provides a cover sound insulation pad and a preparation method and application thereof. The cover sound insulation pad comprises a surface cloth layer, a PU layer and a bottom cloth layer which are sequentially overlapped; the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are attached to each other, and the PE film is attached to the PU layer; the longitudinal static elongation of the surface cloth layer is less than or equal to 10 percent, and the transverse static elongation is 55 to 65 percent. The preparation method comprises the following steps: (1) laying of raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench; (2) hot-press molding: and (2) conveying the raw material obtained in the step (1) to a die, then carrying out baking treatment, then carrying out press forming on the raw material by a forming machine, and then punching to obtain the cover sound insulation pad. The cover sound insulation pad prepared by the invention has good appearance and smaller size deviation, and effectively solves the problem that orange peel is easy to generate in the preparation process of the sound insulation pad.
Description
Technical Field
The invention belongs to the technical field of automotive interior parts, and particularly relates to a cover sound insulation pad and a preparation method and application thereof.
Background
With the rapid development of social economy, the living standard of people is continuously improved, the automobile industry is rapidly developed, and people not only have beautiful appearance but also have high requirements on the comfort level, the functionality and the noise resistance of internal decoration. In the driving process of the automobile, various noises are transmitted to the carriage to cause noise pollution to a driver, so that the sound insulation pad in the front wall is generally arranged on a body sheet metal of the automobile cab to absorb and insulate sound. As is well known, the component material of the present cover sound insulation pad generally comprises glass cotton and a reconstituted cotton material, a small number of the components are made of light PU materials, and along with the development of the automobile manufacturing industry, a plurality of host factories have higher requirements on light weight and odor, so that the utilization rate of the light PU materials is high, PU has the advantages of light weight, strong sound insulation and heat insulation, strong corrosion resistance and the like, the prepared sound insulation pad has the characteristics of light weight, good sound insulation effect and the like, and the performance requirements of the host factories are met.
CN108099331A discloses a sound insulation pad for cover of storage battery for automobile and its manufacturing method. The sound insulation pad is of a three-layer structure, the upper surface and the lower surface of the sound insulation pad are made of needled non-woven fabric materials, the inner side of the sound insulation pad is provided with a film, the middle layer of the sound insulation pad is made of a PET felt material, the film is made of a PE/PA composite film material, and the PET felt material is made of a two-component PET material. The manufacturing method comprises the following steps: (1) preheating a mold temperature controller with a mold; (2) laying non-woven fabrics on the upper layer and the lower layer of the PET felt material to form felt blanks, and then placing the felt blanks in a mould; (3) prepressing the die for 35-40s, and then vulcanizing for 30-40s to prepare the sound insulation pad for the cover cap of the automobile storage battery. Although the sound insulation pad prepared by the technical scheme has good heat insulation performance, the sound insulation effect is poor, the orange peel problem is generated on the surface of the prepared sound insulation pad, and the product has a serious shrinkage problem, so that the finally prepared sound insulation pad has large size deviation.
CN111907164A discloses an automobile front wall inner sound insulation pad and a preparation method and application thereof. The front wall inner sound insulation pad of the automobile comprises a sound insulation cotton layer, a heavy coating layer, a pedal cushion block and a PU (polyurethane) foaming layer which are sequentially stacked, and the preparation method comprises the following steps: baking, heating and pressing the soundproof cotton layer for forming for later use; and (3) drying the heavy coating, performing adsorption forming, sticking the heavy coating to a pedal cushion block, then foaming, sticking the heavy coating to a compression-formed soundproof cotton layer, and finally cutting to obtain the automobile front wall inner soundproof pad. The sound insulation pad prepared by the technical scheme has good sound insulation performance, but is not suitable for being used as a cover sound insulation pad.
CN205800985U discloses a heat and sound insulation pad for machine cover. The cover heat and sound insulation pad mainly comprises a body and radiating fins; the body is connected with the machine cover; the body is pressed with a groove, and the bottom of the groove is provided with a buckle mounting hole penetrating through the body; the radiating fins are detachably connected with the grooves; the radiating fin comprises a polymer magnetic material layer, a polyurethane foam layer and a radiating layer from top to bottom; the heat dissipation layer is arranged close to the side of the engine; the heat dissipation layer comprises a surface layer and a core layer, the core layer is cellular, two side faces of each honeycomb are respectively provided with a flow guide hole, the flow guide holes are fixedly connected with one-way permeable membranes, the two one-way permeable membranes on the same honeycomb are opposite in permeation direction, and a loop capable of circulating is formed between the honeycombs. The core layer is internally provided with filler; the filler is solid at temperatures below a critical value and melts at temperatures above the critical value. Although the heat-insulating and sound-insulating pad provided in the technical scheme has a better hot song effect, the sound-insulating effect is poorer, and an orange peel problem can be generated in the preparation process.
In the preparation process of present cover sound insulating pad, sound insulating pad may have more serious shrink problem, and the cover sound insulating pad that the preparation obtained also can produce more serious orange peel problem and great size deviation problem to influence the pleasing to the eye and the use of cover sound insulating pad. Therefore, how to provide a cover noise insulation pad with excellent aesthetics and small dimensional deviation is a technical problem to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a cover sound insulation pad and a preparation method and application thereof. According to the cover sound insulation pad, the PET non-woven fabric and the PE film which are attached to each other are used as the materials of the surface cloth layer and the bottom cloth layer, and the longitudinal static elongation and the transverse static elongation of the surface cloth layers are further controlled to be within a specific range, so that the cover sound insulation pad is prepared, the problems of orange peel and large size deviation are avoided, and the cover sound insulation pad has good appearance and good use performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a cover sound insulation pad, which comprises a surface cloth layer, a PU layer and a bottom cloth layer which are sequentially overlapped;
the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are jointed, and one side of the PE film, which is far away from the PET non-woven fabric, is jointed with the PU layer;
the longitudinal static elongation of the surface cloth layer is less than or equal to 10 percent, and the transverse static elongation is 55 to 65 percent.
According to the invention, the PET non-woven fabric and the PE film which are attached to each other are used as the surface cloth layer and the bottom cloth layer, and the longitudinal static elongation and the transverse static elongation of the surface cloth layers are controlled within a specific range, so that the shrinkage degree of the surface cloth layers is small, the problem of orange peel and large size deviation of the cover sound insulation pad is avoided, and the cover sound insulation pad has good appearance and good use performance; meanwhile, the cover sound insulation layer prepared by PU has the characteristics of light weight, strong sound insulation and heat insulation performance and good corrosion resistance.
The cover sound insulation pad provided by the invention sequentially comprises a PET non-woven fabric layer, a PE film layer, a PU layer, a PE film layer and a PET non-woven fabric layer.
In the present invention, the machine direction static elongation of the top fabric layer may be 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, or the like.
The static elongation in the cross direction of the top fabric layer may be 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, or the like.
PET is polyethylene terephthalate, PE is polyethylene, and PU is polyurethane.
Meanwhile, it should be noted that the preparation method of the top cloth and the base cloth of the present invention is not limited in any way, as long as the prepared top cloth layer has a longitudinal static elongation of 10% or less and a transverse static elongation of 55% to 65%, and the preparation method of the top cloth layer exemplarily comprises the following steps: (1) firstly, pouring PET fiber filaments into a scattering machine for scattering, wherein the rotating speed of the scattering machine is 3 revolutions per second; (2) secondly, conveying the fiber yarns to a carding machine through a net chain for pre-carding, wherein the speed is 13.1m/min in the pre-carding process; (3) then, lapping the carded fiber yarns layer by layer according to the required gram weight requirement, wherein the speed of the lapping process is 9.5 m/min; (4) carrying out needling treatment on the laid fiber yarns by a needling machine, wherein the speed of the needling machine in the needling treatment is 2m/min, (5) carrying out heat setting on the needled fiber yarns by a hot-pressing roller to obtain the PET non-woven fabric, wherein the heat setting temperature is 150 ℃ and the time is 25 s; (6) and (3) laminating a film on one surface of the PET non-woven fabric to obtain the surface fabric.
The following is a preferred technical solution of the present invention, but not a limitation to the technical solution provided by the present invention, and the object and advantageous effects of the present invention can be better achieved and achieved by the following preferred technical solution.
As a preferable technical scheme of the invention, the gram weight of the PET non-woven fabric in the surface cloth layer is 80-100 g/m2For example, it may be 80g/m2、82g/m2、84g/m2、86g/m2、88g/m2、90g/m2、92g/m2、94g/m2、96g/m2、98g/m2Or 100g/m2And the like.
Preferably, the gram weight of the PET non-woven fabric in the base fabric layer is 25-45 g/m2For example, it may be 25g/m2、27g/m2、30g/m2、33g/m2、35g/m2、37g/m2、40g/m2、42g/m2Or 45g/m2And the like.
As a preferable technical scheme of the invention, the gram weight of the PE film in the surface cloth layer is 20-30 g/m2For example, it may be 20g/m2、21g/m2、22g/m2、23g/m2、24g/m2、25g/m2、26g/m2、27g/m2、28g/m2、29g/m2Or 30g/m2And the like.
Preferably, the grammage of the PE film in the base fabric layer20 to 30g/m2For example, it may be 20g/m2、21g/m2、22g/m2、23g/m2、24g/m2、25g/m2、26g/m2、27g/m2、28g/m2、29g/m2Or 30g/m2And the like.
Preferably, the thickness of the PU layer is 20-25 mm, such as 20mm, 21mm, 22mm, 23mm, 24mm or 25 mm.
In the present invention, the density is preferably 0.01 to 0.02g/cm3The PU used for forming the PU layer may have a density of 0.01g/cm3、0.012g/cm3、0.014g/cm3、0.016g/cm3、0.018g/cm3Or 0.02g/cm3And the like.
In a preferred embodiment of the present invention, the base fabric layer may have a static elongation in the machine direction of 20% to 30%, for example, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or the like.
Preferably, the base fabric layer has a static elongation in the cross direction of 75% to 85%, and may be, for example, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, or the like.
In a second aspect, the present invention provides a method for preparing a mat for engine cover noise insulation as described in the first aspect, comprising the steps of:
(1) laying raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench;
(2) hot-press molding: and (2) conveying the raw material obtained in the step (1) to a die, then carrying out baking treatment, then carrying out press forming on the raw material by a forming machine, and then punching to obtain the cover sound insulation pad.
In the invention, the shrinkage degree of the surface cloth layer is smaller by adopting the operation step of drying and warming before the raw material is pressed and molded, thereby avoiding the problems of orange peel and large size deviation of the cover sound insulation pad, and ensuring the excellent aesthetic property and better service performance of the cover sound insulation pad.
According to the invention, through the arrangement of drying treatment, when the die is pressed downwards, the knife edge is not punched to the end at one time, the product can be molded firstly, and then the knife edge is punched, so that the problem of large edge shrinkage can be avoided.
In a preferred embodiment of the present invention, the upper mold temperature of the mold is 180 to 185 ℃, and may be 180 ℃, 181 ℃, 182 ℃, 183 ℃, 184 ℃ or 185 ℃.
Preferably, the lower mold temperature of the mold is 180 to 185 ℃, for example, 180 ℃, 181 ℃, 182 ℃, 183 ℃, 184 ℃ or 185 ℃.
In the invention, the prepared cover sound insulation pad has good appearance by controlling the temperature of the upper die and the temperature of the lower die of the die within a specific range. If the temperature of the upper die and the temperature of the lower die are too high, the surface cloth is scalded, and the sound insulation pad with good appearance cannot be prepared; if the temperature of the upper die and the temperature of the lower die are too low, bubbles are generated on the surface of the prepared cover sound insulation pad, and the cover sound insulation pad cannot be used.
Preferably, the baking time is 29 to 31 seconds, and may be 29 seconds, 30 seconds, 31 seconds, or the like, for example.
In the invention, the cover sound insulation pad prepared by controlling the time of the baking treatment within a specific range has good appearance. If the drying treatment time is too long, the surface cloth is scalded, and the sound insulation pad with good appearance cannot be prepared; if the drying treatment time is too short, the prepared cover sound insulation pad has large shrinkage degree and is easy to generate orange peel phenomenon.
In a preferred embodiment of the present invention, the pressure holding pressure in the press molding is 18 to 20MPa, and may be, for example, 18MPa, 18.2MPa, 18.5MPa, 18.8MPa, 19MPa, 19.3MPa, 19.5MPa, 19.7MPa or 20 MPa.
Preferably, the dwell time in the press forming is 75-85 s, and may be, for example, 75s, 76s, 77s, 78s, 79s, 80s, 81s, 82s, 83s, 84s, 85s, or the like.
Preferably, the descending speed of the die during punching is 20-30 mm/s, for example, 20mm/s, 21mm/s, 22mm/s, 23mm/s, 24mm/s, 25mm/s, 26mm/s, 27mm/s, 28mm/s, 29mm/s or 30 mm/s.
As a preferable embodiment of the present invention, the method further comprises a step of post-processing after the die cutting.
Preferably, the post-treatment method comprises cooling setting and accessory assembling.
As a preferred technical scheme of the invention, the preparation method specifically comprises the following steps:
(1) laying raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench, wherein the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are attached to each other, and one side of the PE film, which is far away from the PET non-woven fabric, is attached to the PU layer;
(2) hot-press molding: conveying the raw material obtained in the step (1) to a die, then carrying out baking treatment for 29-31 s, then carrying out compression molding and punching on the raw material by a molding machine, and then carrying out cooling shaping and accessory assembly to obtain the cover sound insulation pad, wherein the temperature of an upper die of the die is 180-185 ℃, the temperature of a lower die of the die is 180-185 ℃, the pressure maintaining pressure in the compression molding is 18-20 MPa, the time is 75-80 s, and the descending speed of the die in the punching process is 20-30 mm/s.
In a third aspect, the present invention provides a bonnet acoustic insulating mat as defined in the first aspect for use in automotive construction.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the PET non-woven fabric and the PE film which are attached to each other are used as the surface fabric layer and the bottom fabric layer, the longitudinal static elongation and the transverse static elongation of the surface fabric layer are further controlled within a specific range, and meanwhile, the specific preparation method is adopted, so that the prepared cover sound insulation pad has good appearance, the size deviation is +/-0.5 mm, the size deviation is small, the problem of orange peel of the cover sound insulation pad and the problem of large size deviation are effectively solved, and the cover sound insulation pad has good appearance and good service performance.
Drawings
FIG. 1 is a pictorial view of the acoustic mat of the canopy provided in example 1;
fig. 2 is a real view of the sound insulating mat for the engine cover provided in comparative example 1.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Some of the component sources in the following examples and comparative examples are as follows:
surface cloth: changzhou Shangshen non-woven fabrics, Inc.;
PU (polyurethane): liyang city mountain lake industry Co Ltd automobile decorative materials division;
base fabric: changzhou showpen nonwoven limited.
Example 1
The embodiment provides a cover sound insulation pad and a preparation method thereof, wherein the cover sound insulation pad comprises a surface cloth layer, a PU layer and a bottom cloth layer which are sequentially overlapped;
the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are jointed, and one side of the PE film, which is far away from the PET non-woven fabric, is jointed with the PU layer;
the longitudinal static elongation of the surface cloth layer is 5%, and the transverse static elongation of the surface cloth layer is 60%;
the longitudinal static elongation of the base fabric layer is 23%; the transverse static elongation is 78%;
the gram weight of the non-woven fabric in the surface cloth layer is 90g/m2The gram weight of the PE film is 25g/m2；
The gram weight of the non-woven fabric in the bottom cloth layer is 35g/m2The gram weight of the PE film is 25g/m2；
The thickness of the PU layer is 22 mm.
The preparation method of the cover sound insulation pad comprises the following steps:
(1) laying raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench, wherein the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are attached to each other, and the PE film is attached to the PU layer;
(2) hot-press molding: and (2) conveying the raw material obtained in the step (1) to a die, then carrying out baking treatment for 30s, then carrying out compression molding and punching on the raw material by a forming machine, and then carrying out cooling shaping and accessory assembly to obtain the cover sound insulation pad, wherein the temperature of an upper die of the die is 180 ℃, the temperature of a lower die of the die is 180 ℃, the pressure maintaining pressure in the compression molding is 18MPa, the time is 80s, and the descending speed of the die in the punching process is 22 mm/s.
As shown in fig. 1, it can be seen from fig. 1 that the sound insulation mat for machine covers prepared in this example has a smooth surface and a good appearance.
Example 2
The embodiment provides a cover sound insulation pad and a preparation method thereof, wherein the cover sound insulation pad comprises a surface cloth layer, a PU layer and a bottom cloth layer which are sequentially overlapped;
the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are jointed, and one side of the PE film, which is far away from the PET non-woven fabric, is jointed with the PU layer;
the longitudinal static elongation of the surface cloth layer is 4%, and the transverse static elongation of the surface cloth layer is 55%;
the longitudinal static elongation of the base fabric layer is 25%; the transverse static elongation is 80%;
the gram weight of the non-woven fabric in the surface cloth layer is 95g/m2The grammage of the PE film was 27g/m2；
The gram weight of the non-woven fabric in the bottom cloth layer is 45g/m2The gram weight of the PE film is 20g/m2；
The thickness of PU layer is 25 mm.
The preparation method of the cover sound insulation pad comprises the following steps:
(1) laying of raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench, wherein the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are attached to each other, and the PE film is attached to the PU layer;
(2) hot-press molding: and (2) conveying the raw material obtained in the step (1) to a die, then carrying out baking treatment for 30s, then carrying out compression molding and punching on the raw material by a forming machine, and then carrying out cooling shaping and accessory assembly to obtain the cover sound insulation pad, wherein the temperature of an upper die of the die is 182 ℃, the temperature of a lower die of the die is 182 ℃, the pressure maintaining pressure in the compression molding is 18MPa, the time is 75s, and the descending speed of the die in the punching is 24 mm/s.
Example 3
The embodiment provides a cover sound insulation pad and a preparation method thereof, wherein the cover sound insulation pad comprises a surface cloth layer, a PU layer and a bottom cloth layer which are sequentially overlapped;
the surface cloth layer and the bottom cloth layer both comprise PET non-woven fabrics and PE films which are attached to each other, and one side, far away from the PET non-woven fabrics, of the PE film is attached to the PU layer;
the longitudinal static elongation of the surface cloth layer is 10%, and the transverse static elongation of the surface cloth layer is 65%;
the longitudinal static elongation of the base fabric layer is 30%; the transverse static elongation is 85%;
the gram weight of the non-woven fabric in the surface cloth layer is 100g/m2The gram weight of the PE film is 20g/m2；
The gram weight of the non-woven fabric in the bottom cloth layer is 30g/m2The grammage of the PE film was 30g/m2；
The thickness of PU layer is 24 mm.
The preparation method of the cover sound insulation pad comprises the following steps:
(1) laying raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench, wherein the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are attached to each other, and the PE film is attached to the PU layer;
(2) hot-press molding: and (2) conveying the raw material obtained in the step (1) to a die, then carrying out baking treatment for 31s, then carrying out compression molding and punching on the raw material by a forming machine, and then carrying out cooling shaping and accessory assembly to obtain the cover sound insulation pad, wherein the temperature of an upper die of the die is 184 ℃, the temperature of a lower die of the die is 184 ℃, the pressure maintaining pressure in the compression molding is 20MPa, the time is 85s, and the descending speed of the die in the punching process is 25 mm/s.
Example 4
The embodiment provides a cover sound insulation pad and a preparation method thereof, wherein the cover sound insulation pad comprises a surface cloth layer, a PU layer and a bottom cloth layer which are sequentially overlapped;
the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are jointed, and one side of the PE film, which is far away from the PET non-woven fabric, is jointed with the PU layer;
the longitudinal static elongation of the surface cloth layer is 15%, and the transverse static elongation of the surface cloth layer is 57%;
the longitudinal static elongation of the base fabric layer is 20%; the transverse static elongation is 78%;
the gram weight of the non-woven fabric in the surface cloth layer is 80g/m2The grammage of the PE film is 30g/m2；
The gram weight of the non-woven fabric in the bottom cloth layer is 25g/m2The grammage of the PE film is 27g/m2；
The thickness of PU layer is 25 mm.
The preparation method of the cover sound insulation pad comprises the following steps:
(1) laying raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench, wherein the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are attached to each other, and the PE film is attached to the PU layer;
(2) hot-press molding: and (2) conveying the raw material obtained in the step (1) to a die, then carrying out baking treatment for 29s, then carrying out compression molding and punching on the raw material by a forming machine, and then carrying out cooling shaping and accessory assembly to obtain the cover sound insulation pad, wherein the temperature of an upper die of the die is 185 ℃, the temperature of a lower die of the die is 185 ℃, the pressure maintaining pressure in the compression molding is 18MPa, the time is 78s, and the descending speed of the die in the punching process is 20 mm/s.
Example 5
This example provides a cover acoustic mat and a method for manufacturing the same, which are different from example 1 only in that the baking time is 29 seconds in step (2), and the other conditions are the same as example 1.
Example 6
This example provides a cover acoustic mat and a method for manufacturing the same, which are different from example 1 only in that the baking time in step (2) is 31s, and the other conditions are the same as example 1.
Example 7
This example provides a cover acoustic mat and a method for manufacturing the same, which are different from example 1 only in that the baking time in step (2) is 27 seconds, and the other conditions are the same as example 1.
Example 8
This example provides a cover acoustic mat and a method for manufacturing the same, which are different from example 1 only in that the baking time in step (2) is 33s, and the other conditions are the same as example 1.
Example 9
This example provides a machine cover sound insulating mat and a method for manufacturing the same, which are different from example 1 only in that in step (2), baking treatment is not performed, and other conditions are the same as example 1.
Example 10
The embodiment provides a machine cover sound insulation pad and a preparation method thereof, and the difference from the embodiment 1 is only that the longitudinal static elongation of the surface fabric layer is 10%, and the transverse static elongation is 65%; other conditions were the same as in example 1.
Comparative example 1
This comparative example provides a machine cover sound insulating mat and a method for manufacturing the same, and differs from example 1 only in that the surface fabric layer has a static elongation in the machine direction of 15% and a static elongation in the transverse direction of 70%; other conditions were the same as in example 1.
Fig. 2 shows a real image of the comparative example, and it can be seen from fig. 2 that the cover soundproof mat surface prepared in this example has an orange peel texture.
The performance of the sound-insulating mat for machine covers provided in the above examples and comparative examples was tested according to the following test criteria:
appearance: the cover acoustic insulating mat provided in examples and comparative examples was visually observed for the presence of cracks, thinning, wrinkles on the surface thereof and for the integrity of the formation thereof. If the prepared cover sound insulation pad has a good forming effect and the surface of the cover sound insulation pad is not broken, diluted or wrinkled, the cover sound insulation pad is marked as good; if the surface of the bamboo is wrinkled, marking as orange peel;
dimensional deviation: the cover sound insulating pad provided in the examples and comparative examples was placed on the gauge, and the dimensional deviation of the product was measured using a surface gauge and a clearance gauge.
The performance test results of the soundproof mats for machine covers provided in the above examples and comparative examples are shown in the following table 1:
TABLE 1
As can be seen from the content of the table 1, the PET non-woven fabric and the PE film which are mutually attached are used as the surface fabric layer and the bottom fabric layer, the longitudinal static elongation of the surface fabric layer is further controlled to be less than or equal to 10%, meanwhile, the cover sound insulation pad prepared by the specific preparation method has good appearance, the size deviation is +/-0.5 mm, the orange peel problem and the large size deviation problem of the cover sound insulation pad are effectively solved, and the cover sound insulation pad has good appearance and good service performance.
Compared with example 1, if the time of the baking treatment is too short (example 7), orange peel is generated on the surface of the prepared cover sound insulation pad, and the size deviation is large, so that the practical production and use are not facilitated; if the drying treatment time is too long (example 8), the surface of the prepared cover sound insulation pad is scalded and does not meet the actual production and use requirements; if the baking treatment is not performed (example 9), orange peel is generated on the surface of the prepared cover sound insulating mat, and the dimensional deviation is large, which is not favorable for practical production and use. Therefore, in the process of preparing the cover sound insulation pad, the cover sound insulation pad is baked, the time of baking is controlled within a specific range, and the prepared cover sound insulation pad has good appearance and small size deviation.
Compared with example 1, if the longitudinal elongation of the surface fabric layer is larger (comparative example 1), orange peel is generated on the surface of the prepared cover sound insulation mat, and the dimensional deviation is larger, so that the practical production and use are not facilitated. It was found that by controlling the longitudinal elongation of the fabric layer within a specific range, a sound insulating mat for a machine cover having a good appearance and small dimensional variations can be obtained.
In conclusion, the PET non-woven fabric and the PE film which are attached to each other are used as the surface fabric layer and the bottom fabric layer, the longitudinal static elongation of the surface fabric layer is further controlled to be less than or equal to 10%, and meanwhile, the cover sound insulation pad prepared by the specific preparation method has a good appearance, the problems of orange peel and large size deviation of the cover sound insulation pad are effectively solved, and the cover sound insulation pad is excellent in attractiveness and usability.
The applicant states that the present invention is illustrated by the detailed process flow of the present invention through the above examples, but the present invention is not limited to the above detailed process flow, that is, it does not mean that the present invention must rely on the above detailed process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (18)
1. The cover sound insulation pad is characterized by comprising a surface cloth layer, a PU layer and a bottom cloth layer which are sequentially overlapped;
the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are jointed, and one side of the PE film, which is far away from the PET non-woven fabric, is jointed with the PU layer;
the longitudinal static elongation of the surface cloth layer is less than or equal to 10 percent, and the transverse static elongation is 55 to 65 percent;
the cover soundproof pad is prepared by adopting the following method, and the method comprises the following steps:
(1) laying raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench;
(2) hot-press molding: conveying the raw material obtained in the step (1) to a mold, then carrying out baking treatment, then carrying out press forming on the raw material by a forming machine, and then punching to obtain the cover sound insulation pad;
the drying time is 29-31 s.
2. The sound insulation mat for machine cover of claim 1, wherein the gram weight of the PET non-woven fabric in the surface fabric layer is 80-100 g/m2。
3. The sound insulation mat for machine cover according to claim 1, wherein the gram weight of the PET non-woven fabric in the base fabric layer is 25-45 g/m2。
4. The sound insulation mat for machine cover of claim 1, wherein the grammage of the PE film in the surface cloth layer is 20-30 g/m2。
5. The sound insulation mat for machine cover according to claim 1, wherein the grammage of the PE film in the base cloth layer is 20 to 30g/m2。
6. The cover sound insulating mat according to claim 1, wherein the thickness of the PU layer is 20-25 mm.
7. The acoustic mat for engine covers of claim 1, wherein the base fabric layer has a static elongation in the machine direction of 20% to 30%.
8. The acoustic mat for engine covers of claim 1, wherein the base cloth layer has a static elongation in the transverse direction of 75% to 85%.
9. A method for manufacturing a mat for acoustic insulation of hoods according to any of the claims 1 to 8, characterized in that the method for manufacturing comprises the steps of:
(1) laying raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench;
(2) hot-press molding: conveying the raw material obtained in the step (1) to a mold, then carrying out baking treatment, then carrying out press forming on the raw material by a forming machine, and then punching to obtain the cover sound insulation pad;
the drying time is 29-31 s.
10. The preparation method according to claim 9, wherein the temperature of the upper mold of the mold is 180-185 ℃.
11. The method for preparing the high-temperature-resistant high-temperature-resistant material according to claim 9, wherein the lower mold temperature of the high-temperature-resistant high-temperature-resistant high-temperature-resistant high-temperature-resistant high-temperature resistant high-temperature resistant material.
12. The production method according to claim 9, wherein the pressure holding pressure in the press molding is 18 to 20 MPa.
13. The production method according to claim 9, wherein the dwell time in the press molding is 75 to 85 seconds.
14. The production method according to claim 9, wherein a lowering speed of the die at the time of punching is 20 to 30 mm/s.
15. The method of claim 9, further comprising a post-processing step after said die cutting.
16. The method of claim 15, wherein the post-processing comprises cooling and setting and assembling accessories.
17. The preparation method according to claim 9, characterized in that the preparation method specifically comprises the steps of:
(1) laying raw materials: sequentially superposing a bottom cloth layer, a PU layer and a surface cloth layer on a workbench, wherein the surface cloth layer and the bottom cloth layer respectively comprise a PET non-woven fabric and a PE film which are attached to each other, and one side of the PE film, which is far away from the PET non-woven fabric, is attached to the PU layer;
(2) hot-press molding: conveying the raw material obtained in the step (1) to a die, then carrying out baking treatment for 29-31 s, then carrying out compression molding and punching on the raw material by a molding machine, and then carrying out cooling shaping and accessory assembly to obtain the cover sound insulation pad, wherein the temperature of an upper die of the die is 180-185 ℃, the temperature of a lower die of the die is 180-185 ℃, the pressure maintaining pressure in the compression molding is 18-20 MPa, the time is 75-85 s, and the descending speed of the die in the punching process is 20-30 mm/s.
18. Use of a sound insulating mat for vehicle hoods according to any of claims 1 to 8 in the manufacture of a motor vehicle.
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