CN112318988A - Automobile ceiling knitted fabric and preparation method and application thereof - Google Patents

Automobile ceiling knitted fabric and preparation method and application thereof Download PDF

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CN112318988A
CN112318988A CN202011183096.1A CN202011183096A CN112318988A CN 112318988 A CN112318988 A CN 112318988A CN 202011183096 A CN202011183096 A CN 202011183096A CN 112318988 A CN112318988 A CN 112318988A
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layer
pet
knitted fabric
flame
surface layer
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Inventor
杨子晔
朱可达
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WUXI JIXING AUTO PARTS CO Ltd
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WUXI JIXING AUTO PARTS CO Ltd
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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
    • 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
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • 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
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • 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
    • B32B38/0036—Heat treatment
    • 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
    • B60R13/02—Internal Trim mouldings ; Internal Ledges; Wall liners for passenger compartments; Roof liners
    • B60R13/0212—Roof or head liners
    • B60R13/0231—Roof or head liners specially adapted for roofs with openings
    • 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
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1207—Heat-activated adhesive
    • B32B2037/1215—Hot-melt adhesive
    • 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
    • B32B2250/03—3 layers
    • 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
    • B32B2250/24—All layers being polymeric
    • 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
    • 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
    • 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

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Abstract

The invention relates to an automobile ceiling knitted fabric and a preparation method and application thereof, wherein the automobile ceiling knitted fabric comprises a PET surface layer, a PU layer and a PET bottom layer which are sequentially stacked; the peeling force between the PET surface layer and the PU layer is more than 15N; the peeling force between the PU layer and the PET bottom layer is larger than 8N and smaller than 10N. When the knitted fabric is compounded, the stripping force between the fabric layer and the PU upper layer is larger than 15N, and the stripping force between the PU lower layer and the non-woven fabric is larger than 8N and smaller than or equal to 10N, so that the cutting is easy to separate, the edge covering is easy to tear, the edge covering precision is improved, and the consumable material is reduced.

Description

Automobile ceiling knitted fabric and preparation method and application thereof
Technical Field
The invention belongs to the technical field of manufacturing of automotive interior parts, particularly relates to an automotive ceiling knitted fabric and a preparation method and application thereof, and particularly relates to an automotive ceiling knitted fabric which is easy to separate in cutting, easy to tear edges in wrapping and high in wrapping precision, and a preparation method and application thereof.
Background
The forming process of the roof of the passenger car is generally divided into a dry process and a wet process, and for the roof with the skylight and the edge covering of the knitted fabric formed by the dry process, the knitted fabric is adhered after a dry substrate is baked at a high temperature. For example, CN105015435A discloses a dry method for manufacturing a double-skylight roof of an automobile, which includes the following steps: laying the ceiling fabric on a fabric feeding table of a ceiling forming mechanism according to a specified position, and fixing the two sides of the ceiling fabric by fixing nails; spreading the roof substrate on a feeding table, feeding the roof substrate into an oven for heating, pre-drying at the temperature of 200-250 ℃ for 45-50 seconds, and then heating at the temperature of 270-320 ℃ for 45-50 seconds; placing the roof fabric on a roof base material, feeding the roof base material into a mold, and performing compression molding, wherein the pressure of the mold is controlled to be 4-6MPa, and the compression time is controlled to be 30-35 seconds, so as to obtain a semi-finished product of the double-skylight roof of the automobile; positioning the semi-finished product of the automobile double-skylight ceiling on a water-jet cutting jig according to the position of a cavity of the water-jet cutting jig, and cutting excess material of the product; and dipping the fabric in alcohol to wipe the fabric and blowing the fabric clean in time by using an air gun to obtain the finished product of the automobile double-skylight ceiling. The manufacturing method provided by the invention has the advantages that the production cost is reduced, the production process is efficient and rapid, the weight of the obtained roof product is greatly reduced, but the stripping force of the skylight position is large, the separation is not easy during cutting, the edge is not easy to tear, and the forced separation easily causes damage and loss of the PU layer of the knitted fabric, so that the edge covering effect is poor.
The method for solving the problem of edge covering in recent years can cover one layer of non-woven fabric PET in a dry-method PU or PP substrate skylight area to effectively reduce the stripping force of the skylight area, is easy to separate from the skylight area during cutting, is easy to tear edges during edge covering, but can not accurately cover the non-woven fabric, easily leads to edge covering to generate hollowing, and then increases consumable materials. How not paste the non-woven fabrics through the skylight region, realize that the cutting breaks away from easily, bordures and tears the limit easily, improve the precision of borduring, reduce the consumptive material, be the problem that awaits the solution urgently.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the knitted fabric for the automobile ceiling as well as the preparation method and the application thereof, in particular to the knitted fabric for the automobile ceiling, which is easy to separate by cutting, easy to tear the edge of the edge and high in accuracy of the edge, and the preparation method and the application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the invention provides an automobile ceiling knitted fabric which comprises a PET surface layer, a PU layer and a PET bottom layer which are sequentially stacked;
the peeling force between the PET surface layer and the PU layer is more than 15N;
the peeling force between the PU layer and the PET bottom layer is more than 6N and less than 10N.
According to the invention, when the knitted fabric is compounded, the peeling force between the fabric layer and the PU upper layer is increased to be more than 15N, and the peeling force between the PU lower layer and the non-woven fabric is reduced to be more than 6N and less than or equal to 10N, so that the cutting is easy to separate, the edge covering is easy to tear, the edge covering precision is improved, and the consumable material is reduced.
Preferably, the peel force in the transverse direction and the peel force in the longitudinal direction between the PET skin layer and the PU layer are both greater than 15N, more preferably greater than 18N.
The transverse peeling force and the longitudinal peeling force between the PET skin layer and the PU layer can be independently selected from values larger than 15N, such as 15N, 20N, 22N, 25N, 28N, 30N, 35N, or 40N, and other specific values within the range can be selected, and are not repeated herein.
Preferably, the transverse peeling force and the longitudinal peeling force between the PU layer and the PET bottom layer are both more than 6N and less than 10N, preferably more than 8N and less than 10N.
The lateral and longitudinal peel forces between the PU layer and the PET backsheet may be independently selected from values greater than 6N and less than 10N, such as 6N, 7N, 7.5N, 8N, 8.5N, 9N, 9.5N, or 10N, and the like.
Preferably, the thickness of the PU layer in the knitted fabric for an automotive headliner is 3-3.8mm, for example, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, or 3.8mm, and other specific values in the range can be selected, and thus, the description is omitted.
The thickness of the PU layer in the automobile ceiling knitted fabric is specifically controlled within the range of 3-3.8mm, because the thickness can meet the tooling requirement of roof pressing forming and the ceiling can have certain resilience hand feeling.
In another aspect, the invention provides a preparation method of the knitted fabric for the automobile ceiling, which comprises a flame compounding method, an oil-glue compounding method or a hot-melt glue compounding method.
Preferably, in the flame compounding process, the flame strength between the PET surface layer and the PU layer is adjusted to make the temperature 800-; time ranges from 8 to 16s, such as 8s, 10s, 12s, 13s, 14s, 16s, and the like; other specific values within the range can be selected, and are not described in detail herein.
Preferably, in the flame compounding process, the flame intensity between the PU layer and the PET bottom layer is adjusted to be 800-850 ℃, such as 800 ℃, 810 ℃, 820 ℃, 830 ℃, 840 ℃, 850 ℃ and the like; the time is 12-16s, such as 12s, 13s, 14s, 15s, 16s, etc.; other specific values within the range can be selected, and are not described in detail herein.
When using the flame complex method to compound knitting fabric, increase surface fabric epidermis and PU upper flame temperature for the surface fabric layer and the increase of PU upper peeling strength reduce PU lower floor and non-woven fabrics (PET) flame temperature simultaneously, make peeling strength reduce between PU lower floor and the non-woven fabrics, realize that the cutting breaks away from easily, bordures and tears the limit easily, improves the precision of borduring, reduces the consumptive material.
In another aspect, the invention provides an application of the knitted fabric for the automobile ceiling in a dry-process molding process of the automobile ceiling.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, when the knitted fabric is compounded, the stripping force between the fabric layer and the PU upper layer is larger than 15N, and the stripping force between the PU lower layer and the non-woven fabric is larger than 8N and less than or equal to 10N, so that the cutting is easy to separate, the edge covering is easy to tear, the edge covering precision is improved, and the consumable items are reduced.
Drawings
Fig. 1 is a schematic view of the knitted fabric for the automobile ceiling, wherein 1 is a PET surface layer, 2 is a PU layer, and 3 is a PET bottom layer.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. 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.
Example 1
The embodiment provides a knitted fabric for an automobile ceiling, which comprises a PET surface layer, a PU layer and a PET bottom layer, wherein the original thicknesses of the PET surface layer, the PU layer and the PET bottom layer are respectively 0.75mm, 3.8mm and 0.4 mm. The preparation method comprises the following steps:
flame compounding the PET surface layer, the PU layer and the PET bottom layer by using a flame compounding machine, and adjusting the flame intensity between the PET surface layer and the PU layer to make the temperature be 850 ℃ and the time be 16 s; the flame intensity between the PU layer and the PET bottom layer was adjusted to 850 ℃ for 12 seconds.
The transverse and longitudinal peeling forces between the PET surface layer and the PU layer in the prepared automobile ceiling knitted fabric are measured, and the transverse and longitudinal peeling forces between the PU layer and the PET bottom layer are measured, wherein the measuring method comprises the following steps: GB 8808-88 soft composite plastic material peeling test method.
The results of the measurements are shown in the following table:
Figure BDA0002750672780000041
Figure BDA0002750672780000051
example 2
The embodiment provides a knitted fabric for an automobile ceiling, which comprises a PET surface layer, a PU layer and a PET bottom layer, wherein the original thicknesses of the PET surface layer, the PU layer and the PET bottom layer are respectively 0.6mm, 3.3mm and 0.45 mm. The preparation method comprises the following steps:
flame compounding the PET surface layer, the PU layer and the PET bottom layer by using a flame compounding machine, and adjusting the flame intensity between the PET surface layer and the PU layer to make the temperature be 850 ℃ and the time be 16 s; adjusting the flame intensity between the PU layer and the PET bottom layer to make the temperature 800 ℃ and the time 12 s.
The transverse and longitudinal peeling forces between the PET surface layer and the PU layer in the prepared automobile ceiling knitted fabric are measured, and the transverse and longitudinal peeling forces between the PU layer and the PET bottom layer are measured, and the measuring method is the same as that in example 1. The results of the measurements are shown in the following table:
Figure BDA0002750672780000052
example 3
The embodiment provides a knitted fabric for an automobile ceiling, which comprises a PET surface layer, a PU layer and a PET bottom layer, wherein the original thicknesses of the PET surface layer, the PU layer and the PET bottom layer are respectively 0.55mm, 3.0mm and 0.65 mm. The preparation method comprises the following steps:
flame compounding the PET surface layer, the PU layer and the PET bottom layer by using a flame compounding machine, and adjusting the flame intensity between the PET surface layer and the PU layer to make the temperature be 850 ℃ and the time be 16 s; adjusting the flame intensity between the PU layer and the PET bottom layer to make the temperature 800 ℃ and the time 12 s.
The transverse and longitudinal peeling forces between the PET surface layer and the PU layer in the prepared automobile ceiling knitted fabric are measured, and the transverse and longitudinal peeling forces between the PU layer and the PET bottom layer are measured, and the measuring method is the same as that in example 1. The results of the measurements are shown in the following table:
Figure BDA0002750672780000061
example 4
The embodiment provides a knitted fabric for an automobile ceiling, which comprises a PET surface layer, a PU layer and a PET bottom layer, wherein the original thicknesses of the PET surface layer, the PU layer and the PET bottom layer are consistent with those of the embodiment 1. The preparation method comprises the following steps:
flame compounding the PET surface layer, the PU layer and the PET bottom layer by using a flame compounding machine, and adjusting the flame intensity between the PET surface layer and the PU layer to make the temperature be 850 ℃ and the time be 16 s; adjusting the flame intensity between the PU layer and the PET bottom layer to make the temperature 800 ℃ and the time 12 s.
The transverse and longitudinal peeling forces between the PET surface layer and the PU layer in the prepared automobile ceiling knitted fabric are measured, and the transverse and longitudinal peeling forces between the PU layer and the PET bottom layer are measured, and the measuring method is the same as that in example 1. The results of the measurements are shown in the following table:
Figure BDA0002750672780000062
comparative example 1
The comparative example provides a knitted fabric for an automobile ceiling, which comprises a PET surface layer, a PU layer and a PET bottom layer, wherein the original thicknesses of the PET surface layer, the PU layer and the PET bottom layer are consistent with those of the embodiment 1. The preparation method comprises the following steps:
flame compounding the PET surface layer, the PU layer and the PET bottom layer by using a flame compounding machine, and adjusting the flame intensity between the PET surface layer and the PU layer to ensure that the temperature is 850 ℃ and the time is 14 s; adjusting the flame intensity between the PU layer and the PET bottom layer to make the temperature 800 ℃ and the time 12 s.
The transverse and longitudinal peeling forces between the PET surface layer and the PU layer in the prepared automobile ceiling knitted fabric are measured, and the transverse and longitudinal peeling forces between the PU layer and the PET bottom layer are measured, and the measuring method is the same as that in example 1. The results of the measurements are shown in the following table:
Figure BDA0002750672780000071
comparative example 2
The comparative example provides a knitted fabric for an automobile ceiling, which comprises a PET surface layer, a PU layer and a PET bottom layer, wherein the original thicknesses of the PET surface layer, the PU layer and the PET bottom layer are consistent with those of the embodiment 1. The preparation method comprises the following steps:
flame compounding the PET surface layer, the PU layer and the PET bottom layer by using a flame compounding machine, and adjusting the flame intensity between the PET surface layer and the PU layer to ensure that the temperature is 850 ℃ and the time is 13 s; the flame intensity between the PU layer and the PET bottom layer was adjusted to 850 ℃ for 12 seconds.
The transverse and longitudinal peeling forces between the PET surface layer and the PU layer in the prepared automobile ceiling knitted fabric are measured, and the transverse and longitudinal peeling forces between the PU layer and the PET bottom layer are measured, and the measuring method is the same as that in example 1. The results of the measurements are shown in the following table:
Figure BDA0002750672780000072
Figure BDA0002750672780000081
comparative example 3
The comparative example provides a knitted fabric for an automobile ceiling, which comprises a PET surface layer, a PU layer and a PET bottom layer, wherein the original thicknesses of the PET surface layer, the PU layer and the PET bottom layer are consistent with those of the embodiment 1. The preparation method comprises the following steps:
flame compounding the PET surface layer, the PU layer and the PET bottom layer by using a flame compounding machine, and adjusting the flame intensity between the PET surface layer and the PU layer to ensure that the temperature is 850 ℃ and the time is 12 s; adjusting the flame intensity between the PU layer and the PET bottom layer to make the temperature 800 ℃ and the time 9 s.
The transverse and longitudinal peeling forces between the PET surface layer and the PU layer in the prepared automobile ceiling knitted fabric are measured, and the transverse and longitudinal peeling forces between the PU layer and the PET bottom layer are measured, and the measuring method is the same as that in example 1. The results of the measurements are shown in the following table:
Figure BDA0002750672780000082
evaluation test:
(1) evaluation of the effects of cleavage and detachment
The evaluation indexes are respectively as follows: the cutting is smooth and has no wavy fluctuation (excellent), the cutting is not too smooth and has a small amount of wavy fluctuation (good), and the cutting is not smooth and has a large amount of wavy fluctuation (poor).
The evaluation results are shown in table 1.
(2) Evaluation of edge tearing phenomenon of covered edge
The evaluation indexes are respectively as follows: the PU layer is separated from the non-woven fabric layer, and the sponge is not damaged (excellent); the PU layer is separated from the non-woven fabric layer, and the sponge is damaged (good) a little; the PU layer was separated from the nonwoven fabric layer, and the sponge was largely destroyed (poor).
The evaluation results are shown in table 1.
(3) Evaluation of hemming accuracy
The evaluation indexes are respectively as follows: the edge covering precision is smooth, and the upper part and the lower part are in smooth transition (excellent); the edge covering precision is not too smooth, and the up-down transition is not too smooth (good); the edge covering precision is not smooth, and the up-down transition is not smooth (poor).
The test results are shown in table 1.
TABLE 1
Group of Index 1 Index 2 Index 3
Example 1 Superior food Superior food Superior food
Example 2 Superior food Superior food Good wine
Example 3 Superior food Good wine Superior food
Example 4 Good wine Good wine Good wine
Comparative example 1 Difference (D) Difference (D) Good wine
Comparative example 2 Good wine Difference (D) Difference (D)
Comparative example 3 Good wine Difference (D) Difference (D)
As can be seen from the data in Table 1: the automobile ceiling knitted fabric provided by the invention can realize easy separation of cutting, easy edge tearing of the covered edge and improvement of the accuracy of the covered edge.
The applicant states that the invention is illustrated by the above examples to provide a knitted fabric for automotive headliner, a method for making the same and applications of the same, but the invention is not limited to the above examples, i.e. it is not meant that the invention must be implemented by means of the above examples. 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.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

Claims (8)

1. The automobile ceiling knitted fabric is characterized by comprising a PET (polyethylene terephthalate) surface layer, a PU (polyurethane) layer and a PET bottom layer which are sequentially stacked;
the peeling force between the PET surface layer and the PU layer is more than 15N;
the peeling force between the PU layer and the PET bottom layer is more than 6N and less than 10N.
2. The knitted fabric for an automotive headliner as claimed in claim 1, wherein the transverse peeling force and the longitudinal peeling force between the PET skin layer and the PU layer are both more than 15N, more preferably more than 18N.
3. The knitted fabric for an automotive headliner as claimed in claim 1 or 2, wherein the transverse peeling force and the longitudinal peeling force between the PU layer and the PET substrate are both greater than 6N and less than 10N, preferably greater than 8N and less than 10N.
4. The knitted fabric for automotive headliner as claimed in any one of claims 1 to 3, wherein the thickness of the PU layer in the entire knitted fabric for automotive headliner is 3 to 3.8 mm.
5. The method for preparing the knitted fabric for the headliner of the claims 1-4, wherein the preparation method comprises a flame lamination method, an oil-glue lamination method or a hot-melt glue lamination method.
6. The method for preparing the knitted fabric for the ceiling of the automobile as claimed in claim 5, wherein in the flame compounding process, the flame intensity between the PET surface layer and the PU layer is adjusted to make the temperature 800-.
7. The method for preparing the knitted fabric for the roof of the automobile as claimed in claim 5 or 6, wherein in the flame compounding process, the flame intensity between the PU layer and the PET bottom layer is adjusted to 800-.
8. Use of the knitted fabric for automotive headliner as claimed in any one of claims 1 to 4 in a dry process for automotive headliner formation.
CN202011183096.1A 2020-10-29 2020-10-29 Automobile ceiling knitted fabric and preparation method and application thereof Pending CN112318988A (en)

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CN204354549U (en) * 2014-09-29 2015-05-27 长城汽车股份有限公司 Roof shell fabric and roof of the vehicle
CN105082668A (en) * 2015-09-11 2015-11-25 芜湖正海汽车内饰件有限公司 Special dry-method PU substrate used for vehicle skylight edged ceiling and production process thereof
CN106626656A (en) * 2017-01-09 2017-05-10 杭州湘隽纺织阻燃科技有限公司 Flame-retardant automobile trim fabric composite and application thereof

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