WO2024016578A1

WO2024016578A1 - Manufacturing method for cotton felt front wall sound insulation pad

Info

Publication number: WO2024016578A1
Application number: PCT/CN2022/139518
Authority: WO
Inventors: 费维; 高杰; 朱可达
Original assignee: 无锡吉兴汽车声学部件科技有限公司
Priority date: 2022-07-20
Filing date: 2022-12-16
Publication date: 2024-01-25
Also published as: CN115214170A

Abstract

The present application discloses a manufacturing method for a cotton felt front wall sound insulation pad, comprising the following steps: 1) material preparation: preparing a hard-layer cotton felt and a soft-layer cotton felt, and pre-attaching a PE film to the soft-layer cotton felt; 2) oven heating: heating the hard-layer cotton felt and the soft-layer cotton felt by means of a partitioned oven; 3) hard layer forming: placing the hard-layer cotton felt on a first die body, and carrying out punching forming; and 4) forming punching: placing a hard-layer semi-finished product on a second die body, and paving one side of the PE film of the soft-layer cotton felt downwards on the hard-layer semi-finished product, to realize fitting forming of soft and hard layers. The manufacturing method for a cotton felt front wall sound insulation pad replaces a steam thermoforming process, improves the applicability of equipment to a site, reduces the labor intensity, is low in die cost, high in automation degree and short in forming time, and improves the overall efficiency.

Description

A method of manufacturing a cotton felt cowl sound insulation pad

Technical field

The present application relates to the technical field of automobile interior parts, and in particular to a method of manufacturing a cotton felt cowl sound insulation pad.

Background technique

Car interior parts are generally installed on the top of the car, in the trunk, and under the floor to play the roles of heat insulation, sound insulation, aesthetics, and sound absorption. In an era of increasing pursuit of high performance, environmental protection, energy saving, lightweight and personalization, the interior of a car, like the appearance of the car, has become an important factor for people to buy a car. Therefore, the requirements for car interior parts It's getting higher and higher.

In the existing technology, the high sound absorption, low weight, high strength and other performance indicators of the cowl sound insulation pads have become bottlenecks in the development of this type of interior parts, restricting the development of the cowl sound insulation pads. There is an existing cotton felt cowl sound insulation pad, as shown in Figure 2, including a hard layer of cotton felt 1 and a soft layer of cotton felt 2. The two layers of cotton felt are adhesively connected through a PE film 3. The specific process is as follows: ① Three ②Steam forming and punching; ③Cooling and shaping; ④Waterjet cutting; ⑤Complete product inspection; ⑥Packing and shipping.

In the above process, the steam thermoforming method is limited by the site and is sometimes difficult to implement. Moreover, the steam forming process requires the introduction of steam, pressure maintaining, steam exhaust, etc. The entire process takes a long time and consumes a lot of energy, which affects the overall efficiency and needs to be further optimized.

Contents of the invention

The following is an overview of the topics described in detail in this article. This summary is not intended to limit the scope of the claims.

Based on the above problems, the purpose of this application is to provide a manufacturing method for cotton felt cowl sound insulation pads, optimize the existing process, improve the applicability of the equipment to the site, improve production efficiency, and reduce manufacturing costs.

In order to achieve the above purpose, this application adopts the following technical solutions:

A method for manufacturing a cotton felt cowl sound insulation pad, which includes the steps:

1) Material preparation, equipped with hard layer cotton felt and soft layer cotton felt, with PE film pre-attached to the soft layer cotton felt;

2) Oven heating, the hard layer cotton felt and soft layer cotton felt are heated through the partitioned oven;

3) Hard layer forming, the hard layer cotton felt is placed on the first mold body, and punched and formed to obtain a hard layer semi-finished product;

4) Forming and punching, the hard layer semi-finished product is placed on the second mold body, and the PE film of the soft layer cotton felt is laid face down on the hard layer semi-finished product to achieve the joint molding of the soft and hard layers.

In particular, in step 1), the soft layer cotton felt with PE film is processed directly before leaving the factory.

In particular, in step 2), the set temperatures corresponding to the hard layer cotton felt area in the oven are: 270°C for the upper layer and 285°C for the lower layer; the set temperatures corresponding to the soft layer cotton felt area are: 260°C for the upper layer and 270°C for the lower layer. The baking time is 145s.

In particular, in step 3), the molding pressure of the mold used for hard layer molding is 20 MPa, and the pressure holding time is 60 seconds.

In particular, in step 4), the upper mold temperature of the mold used for forming and punching is 100°C, the lower mold temperature is 160°C, the molding pressure is 20Mpa, and the holding time is 60s.

In particular, the first mold body and the second mold body are arranged on the bottom plate of the same mold, so that one mold and two mold bodies can be punched simultaneously.

In particular, step 4) also includes step: 5) cooling and shaping, and the cooling time is 60 seconds.

In particular, step 5) also includes step: 6) water jet cutting, the cutting water pressure is 40000psi~50000psi, and the cutting air pressure is 0.4Mpa~0.7Mpa.

To sum up, the beneficial effect of this application is that the manufacturing method of the cotton felt cowl sound insulation pad has the following advantages over the existing technology:

1) It eliminates the need for stacking and combining multiple layers of materials and reduces manual labor intensity;

2) It replaces the steam thermoforming method, the oven heating occupies a small space and has strong on-site versatility;

3) One-mold and two-body punching structure reduces mold costs and speeds up production pace;

4) Each process can be realized through automation, the molding time is short, and the overall efficiency is improved.

Other aspects will be apparent after reading and understanding the drawings and detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions herein, and constitute a part of the specification. They are used to explain the technical solutions herein together with the embodiments of the present application, and do not constitute a limitation of the technical solutions herein.

Figure 1 is a flow chart of a manufacturing method of a cotton felt cowl soundproof pad provided by an embodiment of the present application;

Figure 2 is a product schematic diagram of the cotton felt cowl sound insulation pad provided by the embodiment of the present application.

Detailed ways

The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, but should not be construed as limiting the present application.

In the description of this application, unless otherwise clearly stated and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or a mechanical connection. The connection can also be an electrical connection, it can be a direct connection, or it can be an indirect connection through an intermediary. It can be an internal connection between two components or an interactive relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the description of this application, unless otherwise explicitly stated and limited, the term "above" or "below" a first feature to a second feature may include the first feature being in direct contact with the second feature, or it may include the first feature being in direct contact with the second feature. The second feature is not in direct contact but is in contact with another feature between them. Furthermore, references "above", "above" and "over" a first feature to a second feature include the first feature being directly above and diagonally above the second feature, or simply mean that the first feature is at a higher level than the second feature. “Below”, “under” and “under” the first feature is the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature is less horizontally than the second feature.

The technical solution of the present application will be further described below with reference to the accompanying drawings and through specific implementation methods.

This preferred embodiment provides a method for manufacturing a cotton felt cowl soundproof pad, which includes the following steps for the product shown in Figure 2:

Step S100: Material preparation, equipped with a hard layer of cotton felt 1 and a soft layer of cotton felt 2, with a PE film 3 pre-attached to the soft layer of cotton felt 2. It should be noted that the soft-layer cotton felt 2 with the PE film 3 can be directly processed before leaving the factory, thereby reducing subsequent processes.

Step S200: Heating in the oven, the hard layer cotton felt 1 and the soft layer cotton felt 2 are heated through the partitioned oven. Among them, the upper layer temperature corresponding to the hard layer cotton felt 1 area in the oven is set to 270°C, and the lower layer temperature is 285°C. The set upper layer temperature corresponding to the soft layer cotton felt 2 area in the oven is 260°C, and the lower layer temperature is 270°C. The baking time is 145s.

Step S300: Hard layer forming. The hard layer cotton felt 1 is placed on the first mold body and punched and formed. The molding pressure of the mold used for hard layer molding is 20Mpa, and the holding time is 60s.

Step S400: Forming and punching, the hard layer semi-finished product is placed on the second mold body, and the PE film 3 of the soft layer cotton felt 2 is laid face down on the hard layer semi-finished product to realize the soft and hard layer bonding and molding. The upper mold temperature of the mold used for forming and punching is 100°C, the lower mold temperature is 160°C, the molding pressure is 20Mpa, and the holding time is 60s.

It is worth mentioning that the first mold body and the second mold body are arranged on the bottom plate of the same mold, realizing one mold and two molds for punching at the same time, which reduces costs and speeds up the production cycle.

Step S500: Cooling and shaping, the cooling time is 60s.

Step S600: Water jet cutting, the cutting water pressure is 40000psi～50000psi, and the cutting air pressure is 0.4Mpa～0.7Mpa.

Step S700: Complete product inspection.

Step S800: Packing and shipping.

In summary, the above-mentioned manufacturing method of cotton felt cowl sound insulation pads eliminates the need for stacking and combining multiple layers of materials, reduces manual labor intensity, and replaces the steam thermoforming method. Oven heating occupies a small space and has strong on-site versatility. , the one-mold two-body punching structure reduces the mold cost and speeds up the production cycle. In addition, each process can be realized through automation, the molding time is short, and the overall efficiency is improved.

The above embodiments only illustrate the basic principles and characteristics of the present application. The present application is not limited by the above embodiments. There are various changes and changes in the present application without departing from the spirit and scope of the present application. These changes and changes are fall within the scope of the claimed application. The scope of protection claimed in this application is defined by the appended claims and their equivalents.

Claims

A method for manufacturing a cotton felt cowl sound insulation pad, which includes the following steps:

1) Material preparation, equipped with a hard layer of cotton felt and a soft layer of cotton felt, with a PE film pre-attached to the soft layer of cotton felt;

2) Oven heating, the hard layer cotton felt and soft layer cotton felt are heated through a partitioned oven;

3) Hard layer forming, the hard layer cotton felt is placed on the first mold body and punched and formed to obtain a hard layer semi-finished product;

4) Forming and punching, the hard layer semi-finished product is placed on the second mold body, and the PE film of the soft layer cotton felt is laid face down on the hard layer semi-finished product to achieve soft and hard layer lamination. forming.
The manufacturing method of cotton felt cowl sound insulation pad according to claim 1, wherein: the first mold body and the second mold body are arranged on the bottom plate of the same mold, realizing one mold and two molds, punching at the same time. cut.
The manufacturing method of cotton felt cowl sound insulation pad according to claim 1, wherein: in step 1), the soft layer cotton felt with PE film is processed directly before leaving the factory.
The manufacturing method of cotton felt cowl sound insulation pad according to claim 1, wherein: in step 2), the set temperature corresponding to the hard layer cotton felt area in the oven is: 270°C for the upper layer and 285°C for the lower layer. ; The set temperatures corresponding to the soft layer cotton felt area are: 260°C for the upper layer, 270°C for the lower layer, and the baking time is 145s.
The manufacturing method of cotton felt cowl sound insulation pad according to claim 1, wherein: in step 3), the molding pressure of the mold used for molding the hard layer is 20 MPa, and the pressure holding time is 60 s.
The manufacturing method of cotton felt cowl sound insulation pad according to claim 1, wherein: in step 4), the upper mold temperature of the mold used for forming and punching is 100°C, the lower mold temperature is 160°C, and the molding pressure is 20Mpa, pressure holding time is 60s.
The manufacturing method of cotton felt cowl sound insulation pad according to claim 1, wherein: step 4) further includes step: 5) cooling and shaping, and the cooling time is 60s.
The manufacturing method of cotton felt cowl sound insulation pad according to claim 7, wherein: step 5) further includes step: 6) water jet cutting, the cutting water pressure is 40000psi～50000psi, and the cutting air pressure is 0.4Mpa～ 0.7Mpa.