WO2022077552A1

WO2022077552A1 - Thermoplastic automotive interior trim, and preparation mold and preparation method therefor

Info

Publication number: WO2022077552A1
Application number: PCT/CN2020/123830
Authority: WO
Inventors: 袁瑞建
Original assignee: 广东聚石化学股份有限公司
Priority date: 2020-10-16
Filing date: 2020-10-27
Publication date: 2022-04-21
Also published as: CN112297545A; CN112297545B

Abstract

Disclosed are a thermoplastic automotive interior trim, and a preparation mold and a preparation method therefor. The preparation mold comprises an upper mold plate and a lower mold plate. The upper mold plate and the lower mold plate are oppositely arranged to form an inner mold cavity. The lower mold plate is provided with telescopic gas pins, and vacuum plastic-absorbing holes in communication with the inner mold cavity. The telescopic gas pins can extend into the inner mold cavity. According to the present invention, a thermoplastic automotive interior trim finished product can be prepared in one step by means of compression molding, preparation procedures are simple, the production efficiency is high, the preparation process is environmentally friendly, and there is no need to use an adhesive. The core material of the thermoplastic automotive interior trim is a foamed core material or a thermoplastic honeycomb-structured core material, thereby achieving the effect of being lightweight. The internal structure of the thermoplastic automotive interior trim can be freely designed, products of equal thickness or products of unequal thickness can be produced according to requirements, and a product folding function can be achieved by one-step mold pressing. The thermoplastic automotive interior trim can be recycled and reused, is light in terms of weight, and has a good sound insulation effect and a large bearing capacity.

Description

A thermoplastic automobile interior trim part and its preparation mold and preparation method

technical field

The invention belongs to the technical field of automobile interior trim parts manufacturing, and in particular relates to a thermoplastic automobile interior trim part, a preparation mold and a preparation method thereof.

Background technique

Molding is the abbreviation of compression molding, also known as compression molding, which is a processing method in which plastic or rubber compounds are formed into products by heating and pressing in a closed mold cavity. Molding has many advantages, such as low processing cost, good product repeatability, easy to realize automatic production, and one-time molding of complex products. It has been widely used in the processing of cloakrooms, ceilings, pedals and other products.

Nowadays, the trunk covers of high-load-bearing vehicles are mainly made of PHC wet-laid honeycomb panels, which need to be sprayed and wrapped in the subsequent process. The preparation process is complicated, the smell is large, the VOC is easy to exceed the standard, and there is a risk of leakage of glass fiber. The leakage is easy to cause skin allergies, and the materials cannot be recycled and reused, and the folding function cannot be processed in one time. Such as PP honeycomb panels, hexagonal honeycomb fiberglass panels, round-hole honeycomb fiberglass panels and other foamed core glass fiber reinforced composite panels, the composite panels are softened and pressed into shape by baking. It is suitable for the preparation of products with complex vehicle body space and different thickness requirements.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a thermoplastic automobile interior trim part, a preparation mold and a preparation method thereof.

In order to achieve its purpose, the technical scheme adopted in the present invention is: a preparation mold for thermoplastic automobile interior trim parts, which comprises an upper template and a lower template, and the upper template and the lower template are opposed to form an inner mold cavity, so the inner mold cavity is formed. The lower template is provided with a telescopic air needle and a vacuum suction hole communicating with the inner mold cavity, and the telescopic air needle can extend into the inner mold cavity. Thus, the mold of the present invention can realize one-step compression molding to prepare thermoplastic automobile interior trim parts through the vacuum suction and blow molding principles, which greatly simplifies the preparation process of automobile interior trim parts.

Preferably, the lower formwork comprises at least two sections, and the heights of adjacent sections are unequal. Thus, the mold of the present invention can be used for one-time compression molding to prepare thermoplastic automotive interior parts with unequal thicknesses.

Preferably, a bent connecting portion is provided between the adjacent segments. In this way, folding lines can be reserved between parts of different thicknesses of the thermoplastic automobile interior trim part, so that the automobile interior trim part can realize the folding function.

Preferably, each of the segments is provided with the telescopic air needle and the vacuum forming hole.

Preferably, cooling water passages are provided inside the upper formwork and the lower formwork. Thereby, cooling water can be passed into the interior of the upper die plate and the lower die plate for cooling.

The present invention also provides a thermoplastic automobile interior trim part, which is prepared by using the preparation mold of the thermoplastic automobile interior trim part, the thermoplastic automobile interior trim part includes a core material and a skin wrapping the core material, the The epidermis consists of upper and lower epidermis.

Preferably, a decorative fabric layer is further provided on the surface of the upper skin.

Preferably, the thermoplastic automobile interior trim component is a sandwich structure with unequal thickness, and the thermoplastic automobile interior trim component is provided with at least two core materials, and the thicknesses of adjacent core materials are unequal.

Preferably, a metal support frame is provided between adjacent core materials. Metal support frames increase the load-bearing capacity of automotive interior parts.

Preferably, the core material is made of thermoplastic material, which may be selected from polyolefin materials. For example, the core material of the honeycomb structure is formed by plasticizing and extruding the polyolefin material or the core material of the corresponding structure is foamed.

Preferably, the upper skin and the lower skin can be made of an extruded skin made of polyolefin, an extruded skin of fiber-reinforced polyolefin, or a pressed skin blended with polypropylene and glass fibers. Preferably, the thicknesses of the upper epidermis and the lower epidermis are respectively 1-5 mm.

Preferably, the thermoplastic automotive interior parts have a thickness of 5-30 mm.

Preferably, the decorative fabric layer is made of non-woven fabrics, knitted fabrics, leather and other materials that can realize thermal compounding. As a result, there is no need for subsequent glue spray processing, and one-time compression molding is required.

Preferably, the thermoplastic automotive interior parts are trunk lids, spare tire lids, ceilings or footrests and the like.

The present invention also provides a method for preparing the thermoplastic automotive interior trim, which comprises molding using a preparation mold for the thermoplastic automotive interior, and the specific steps are as follows:

(1) heating and baking the upper epidermis and the lower epidermis;

(2) placing the lower skin on the lower template, vacuuming to make the lower skin close to the cavity of the lower template, and then opening the telescopic air needle to penetrate the lower skin;

(3) According to the thickness requirements of the product, place the core material of the corresponding thickness on the corresponding inner mold cavity;

(4) the upper skin is placed on the core material, and the decorative fabric layer is placed on the upper skin;

(5) Clamping the mold, blowing air, cooling and shaping, cutting off the side material, de-vacuuming, stopping the air blowing, de-airing needle, opening the mold and taking out the parts to obtain the thermoplastic automobile interior trim part.

Preferably, in the step (1), an infrared non-contact oven is used to bake and heat the upper skin and the lower skin, the heating temperature is 200-300° C., and the heating time is 30-60 s.

Preferably, in the step (2), the vacuum pressure for evacuation is 0.1-0.5Mpa.

Preferably, when the thermoplastic automobile interior trim is a sandwich structure with unequal thickness, the step (3) further includes the following operation: placing a metal support frame between adjacent core materials.

Preferably, in the step (5), the clamping pressure is 18-25MPa, and the pressure-holding time is 30-180s; the blowing pressure is 0.5-0.8Mpa, and the blowing time is 30-180s.

Compared with the prior art, the present invention has the following beneficial effects: the present invention can produce finished thermoplastic automobile interior parts by one-time compression molding, the preparation process is simple, the production efficiency is high, the preparation process is environmentally friendly, and no adhesive is required. The core material of thermoplastic automotive interior parts is a foam core material or a thermoplastic honeycomb structure core material, which achieves a lightweight effect. The internal structure of thermoplastic automotive interior parts can be freely designed, and products of equal thickness or unequal thickness can be produced according to needs, and can be molded in one step to realize the product folding function. A metal support frame can be added to the interior of thermoplastic automotive interior parts to improve the load-bearing capacity of the product and replace the existing high-load-bearing PHC wet-laid paper honeycomb. The thermoplastic automobile interior trim parts prepared by the invention can be recycled and reused, and are light in weight, good in sound insulation effect and large in bearing capacity.

Description of drawings

Fig. 1 is the structural representation of thermoplastic automobile interior trim part according to the present invention;

FIG. 2 is a schematic view of the state during molding of the thermoplastic automotive interior trim according to the present invention.

In the figure, 1. Upper template; 2. Lower template; 3. Connection part; 21. Vacuum suction hole; 22. Telescopic air needle; a. Decorative fabric layer; b. Upper skin; c. Lower skin; d. Front-end core material; e. Back-end core material; f. Metal support frame; g. Folding line.

Detailed ways

The technical solutions of the present invention will be further described below with reference to the embodiments and the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention. In the present invention, unless otherwise specified, the materials and connection methods used are existing materials or existing conventional connections. Those skilled in the art can directly purchase or customize products from the market according to the required product models and specifications.

Example 1

A thermoplastic automobile interior trim part comprises a core material and a skin wrapping the core material, the skin is composed of an upper skin and a lower skin, and a decorative fabric layer is arranged on the surface of the upper skin. The thermoplastic automobile interior trim part of this embodiment has a sandwich core structure of unequal thickness, and the thermoplastic automobile interior trim part is provided with at least two core materials of unequal thickness, and a metal support frame may be arranged between adjacent core materials. The core material is made of thermoplastic material, and the thermoplastic material can be selected from polyolefin materials, such as a core material of a honeycomb structure formed by plasticizing and extruding a polyolefin material or a core material of a corresponding structure formed by foaming. The quality of the core material of the structure Lightweight, which can reduce the weight of automotive interior parts. The upper and lower skins can be made of polyolefin extruded skins, fiber-reinforced polyolefin extruded skins, or polypropylene and glass fiber blended pressed skins; the thicknesses of the upper and lower skins are 1 to 5 mm respectively. ; The total thickness of thermoplastic automotive interior parts is 5 to 30 mm. The decorative fabric layer is made of non-woven fabrics, knitted fabrics, leather and other materials that can realize thermal compounding; thus, there is no need for subsequent glue spray processing, and one-time molding is required. The thermoplastic automobile interior parts of this embodiment are trunk lids, spare tire lids, ceilings or footboards, and the like.

Example 2

A mold for preparing thermoplastic automotive interior parts, as shown in Figure 2, includes an upper mold plate 1 and a lower mold plate 2, and the upper mold plate 1 and the lower mold plate 2 are opposed to form an inner mold cavity. The lower formwork is provided with at least two sections, the heights of adjacent sections are unequal, and a bent connecting portion 3 is arranged between the adjacent sections. Thereby, it is possible to realize the preparation of thermoplastic automotive interior parts of unequal thickness by one-time compression molding, and reserve folding lines between parts of different thicknesses of the thermoplastic automotive interior parts through the connecting part 3, so that the automotive interior parts can realize the folding function . In addition, each section is provided with a telescopic air needle 22 and a vacuum suction hole 21, the vacuum suction hole 21 communicates with the inner mold cavity, and the telescopic air needle 22 can extend into the inner mold cavity. Cooling water passages are arranged inside the upper die plate 1 and the lower die plate 2, so that cooling water can be passed into the upper die plate 1 and the lower die plate 2 for cooling.

Example 3

Adopt the preparation mould of embodiment 2 to prepare the method for the thermoplastic automobile interior trim part of embodiment 1, and the steps are as follows:

(1) Place the upper and lower skins in an infrared non-contact oven, and heat and bake at 200-300°C for 30-60s;

(2) Place the lower epidermis on the lower template, vacuumize to a vacuum pressure of 0.1-0.5Mpa, make the lower epidermis close to the cavity of the lower template, and open the telescopic air needle to penetrate the lower epidermis after 1-2s;

(3) According to the thickness requirements of the product, place the core material of the corresponding thickness on the corresponding inner mold cavity, and place the metal support frame between the adjacent core materials;

(5) Clamping the mold, blowing air, cooling and shaping, cutting off the side material, de-vacuuming, stopping the air blowing, degassing needle, opening the mold and taking out the parts, that is, the thermoplastic automotive interior parts; the pressure-holding pressure of clamping the mold is 18 ～25MPa, the pressure holding time is 30～180s; the blowing pressure is 0.5～0.8Mpa, and the blowing time is 30～180s.

Example 4

A method for preparing a thermoplastic automobile spare tire cover plate of unequal thickness includes using the preparation mold of Example 2 to perform compression molding, as shown in Figures 1-2. The core material of the spare tire cover is 20 times the PP foam core, the thickness of the front core material d is 12mm, the thickness of the rear core material e is 20mm, and there is an H between the front end core material d and the rear core material e. type aluminum alloy support frame f; upper skin b and lower skin c are PP-TD20 material, 1.2mm thick; decorative fabric layer a covering the surface of upper skin b is 200g/m ² PET non-woven fabric. The steps of the preparation method are as follows:

(1) Place the upper and lower skins in an infrared non-contact oven, and heat and bake at 260°C for 30s;

(2) Place the lower epidermis on the lower template, evacuate to a vacuum pressure of 0.3Mpa, make the lower epidermis close to the cavity of the lower template, and open the telescopic air needle to penetrate the lower epidermis after 2s;

(3) The 20mm thick core material is placed on the inner mold cavity at the rear end, the 12mm thick core material is placed on the inner mold cavity at the front end, and the H-shaped aluminum alloy support frame is placed at the folding line;

(5) Upper and lower mold clamping, air blowing, 10 ℃ cooling water cooling and shaping, cutting edge material; the clamping pressure is 18MPa, and the pressure holding time is 60s; the air blowing pressure is 0.6Mpa, and the air blowing time is 60s;

(6) Evacuate the vacuum, stop the air blowing, degas the needle, open the mold and take out the spare tire cover.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the The technical solutions of the invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the invention.

Claims

A mold for preparing thermoplastic automotive interior trim parts, characterized in that it comprises an upper template and a lower template, the upper template and the lower template are opposed to form an inner mold cavity, and the lower template is provided with a telescopic air needle, and a vacuum suction hole communicated with the inner mold cavity, and the telescopic air needle can extend into the inner mold cavity.
The preparation mold according to claim 1, wherein the lower template comprises at least two sections, and the heights of adjacent sections are unequal; preferably, there are curved sections between adjacent sections. Preferably, each of the segments is provided with the telescopic air needle and the vacuum forming hole.
The preparation mold according to claim 1, wherein cooling water passages are arranged inside the upper mold plate and the lower mold plate.
A thermoplastic automobile interior trim part is characterized in that, it is prepared by using the preparation mold of the thermoplastic automobile interior trim part according to any one of claims 1 to 3, and the thermoplastic automobile interior trim part comprises a core material and a wrapping part. The skin of the core material is made of thermoplastic material, and the skin is composed of an upper skin and a lower skin.
The thermoplastic automobile interior trim part according to claim 4, wherein a decorative fabric layer is further provided on the surface of the upper skin.
The thermoplastic automobile interior trim part according to claim 4, wherein the thermoplastic automobile interior trim part is a sandwich structure of unequal thickness, and the thermoplastic automobile interior trim part is provided with at least two core materials, adjacent to each other. The thickness of the core material varies.
The thermoplastic automobile interior trim part according to claim 4, wherein a metal support frame is arranged between the adjacent core materials.
A method for preparing a thermoplastic automobile interior trim part, characterized in that it comprises using the preparation mold of the thermoplastic automobile interior trim part according to any one of claims 1 to 3 to be molded, and the specific steps are as follows:

(1) heating and baking the upper epidermis and the lower epidermis;

(2) placing the lower skin on the lower template, vacuuming to make the lower skin close to the cavity of the lower template, and then opening the telescopic air needle to penetrate the lower skin;

(3) According to the thickness requirements of the product, place the core material of the corresponding thickness on the corresponding inner mold cavity;

(4) the upper skin is placed on the core material, and the decorative fabric layer is placed on the upper skin;

(5) Clamping the mold, blowing air, cooling and shaping, cutting off the side material, de-vacuuming, stopping the air blowing, de-airing needle, opening the mold and taking out the parts to obtain the thermoplastic automobile interior trim part.
The preparation method according to claim 8, characterized in that, in the step (1), an infrared non-contact oven is used to bake and heat the upper skin and the lower skin, the heating temperature is 200-300°C, and the heating time is 30～60s.
The preparation method according to claim 8, characterized in that, in the step (5), the pressure-holding pressure of mold clamping is 18-25MPa, the pressure-holding time is 30-180s, and the blowing pressure is 0.5-0.8Mpa , the blowing time is 30 to 180s.