WO2022089540A1

WO2022089540A1 - Steering wheel leather wrapping method and steering wheel

Info

Publication number: WO2022089540A1
Application number: PCT/CN2021/127074
Authority: WO
Inventors: 欧阳剑雄; 周超; 安晓超
Original assignee: 奥托立夫开发公司; 欧阳剑雄
Priority date: 2020-10-30
Filing date: 2021-10-28
Publication date: 2022-05-05
Also published as: CN114435457A

Abstract

A steering wheel leather wrapping method, comprising the following steps: pre-coating the back side of a leather (1) with a first powder glue (2) and a second powder glue (3), the melting point of the first powder glue (2) being lower than the melting point of the second powder glue (3); heating the leather (1) to a first set temperature to melt the first powder glue (2), and then bonding the leather (1) to a steering wheel; and heating the steering wheel to a second set temperature, the second set temperature being higher than the first set temperature, and melting the second powder glue (3) to further bond the leather (1) to the steering wheel. In the present method, due to the introduction of powder glues, manual glue brushing is no longer needed, such that the leather covering efficiency is improved, and the manufacturing cost is greatly reduced. The present application also relates to a steering wheel.

Description

Steering wheel leather wrapping method and steering wheel

technical field

The invention relates to the technical field of steering wheel processing methods, in particular to a steering wheel leather wrapping method and steering wheel.

Background technique

A conventional steering wheel includes a rim portion on which an operating ring is formed, a boss portion provided at the center of the rim portion, and a plurality of spoke portions for connecting the rim portion and the boss portion.

In order to obtain a high-quality steering wheel appearance or operability, the rim portion is required to be covered with leather.

The existing process uses hand-wrapped leather, and the conventional steps for hand-wrapped leather are as follows:

1. Cut the leather into thin slices;

2. The leather ends are aligned and hand stitched together to form a leather loop;

3. Install the leather collar on the steering wheel, and wrap the leather collar around the periphery of the outer edge portion;

4. Coat the liquid adhesive on the back of the leather and the steering wheel foam to bond the inner side of the leather ring and the rim;

5. Dry glue;

6. Activate the liquid glue with hot air, and stick the leather ring to the rim part;

7. Sew the end of the leather loop to complete the leather winding job;

8. Perform final finishing and cleaning.

The existing wrapping leather process, gluing and pasting of liquid glue is manual, which requires a lot of work and labor, and is inefficient.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a steering wheel leather wrapping method and steering wheel with high efficiency and low cost without manual gluing.

The technical scheme of the present invention provides a steering wheel leather wrapping method, comprising the following steps:

Pre-coating a first powder glue and a second powder glue on the back of the leather, the melting point of the first powder glue is lower than the melting point of the second powder glue;

heating the leather to a first set temperature, melting the first powder glue, and then bonding the leather to the steering wheel;

The steering wheel is heated to a second set temperature, and the second set temperature is higher than the first set temperature, and the second powder glue is melted to further bond the leather to the steering wheel.

Further, the melting point of the first powder glue is 40-60°C.

Further, the highest melting point of the second powder glue is 100-120°C.

Further, when the leather is heated to the first set temperature, a low-temperature heat drying gun is used for heating.

Further, when the steering wheel is heated to the second set temperature, the steering wheel is placed in a high temperature room for heating.

Further, the first powder glue and the second powder glue are hot melt glue.

Further, before heating the leather to the first set temperature, the following steps are also included:

cutting the leather into skins;

sewing the flaps into aprons;

Put the apron over the steering wheel.

Further, before the step of heating the steering wheel to the second set temperature, the aprons are sewn.

The present invention also provides a steering wheel, comprising an annular rim portion and leather wrapped around the rim portion, the back of the leather is pre-coated with a first powder glue and a second powder glue, the first powder glue is The melting point is lower than the melting point of the second powder glue, and the leather is bonded to the outside of the rim portion through the first powder glue and the second powder glue.

Further, the first powder glue and the second powder glue are coated on the back of the leather at intervals.

Further, the first powder glue is arranged in a plurality of straight lines, the second powder glue is arranged in a plurality of straight lines, and a plurality of the first powder glue and the second powder glue are arranged at intervals.

Further, a PU foam layer is also provided between the leather and the rim portion, the leather is directly bonded to the PU foam layer, and the PU foam layer is bonded to the rim portion.

After adopting the above-mentioned technical scheme, it has the following beneficial effects:

Due to the introduction of powder glue in the invention, manual glue brushing is no longer required, the leather covering efficiency is also improved, and the manufacturing cost is greatly reduced.

Description of drawings

The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. It should be understood that these drawings are only for the purpose of illustration and are not intended to limit the protection scope of the present invention. In the picture:

1 is a schematic diagram of a steering wheel in Embodiment 1 of the present invention;

Fig. 2 is the schematic diagram of leather back in embodiment one of the present invention;

Fig. 3 is the side view of Fig. 2;

FIG. 4 is a flow chart of a method for wrapping leather of a steering wheel in the second embodiment of the present invention.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

It is easy to understand that, according to the technical solutions of the present invention, without changing the essential spirit of the present invention, those of ordinary skill in the art can replace various structural modes and implementation modes with each other. Therefore, the following specific embodiments and accompanying drawings are only exemplary descriptions of the technical solutions of the present invention, and should not be regarded as all of the present invention or as limitations or restrictions on the technical solutions of the invention.

Orientation terms such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possibly mentioned in this specification are defined relative to the configurations shown in the respective drawings, which are It is a relative concept, so it may change accordingly according to its different locations and different usage states. Therefore, these and other terms of orientation should not be construed as limiting.

Example 1:

As shown in Figure 1-3, the steering wheel includes an annular rim portion and a leather 1 wrapped around the rim portion. The back of the leather 1 is pre-coated with a first powder glue 2 and a second powder glue 3. The first powder glue 2 The melting point of the leather 1 is lower than the melting point of the second powder glue 3, and the leather 1 is bonded to the outside of the rim part through the first powder glue 2 and the second powder glue 3.

First heat to a lower temperature to melt the first powder glue 2, then bond the leather 1 to the outside of the rim; then heat it to a higher temperature to melt the second powder glue 3 to further strengthen the bonding Effect.

Due to the introduction of powder glue, the powder glue can be sprayed on the back of the leather 1 by a machine, and manual glue brushing is no longer required.

Further, as shown in Figures 2-3, the first powder glue 2 and the second powder glue 3 are coated on the back of the leather at intervals.

Preferably, as shown in FIG. 2 , the first powder glues 2 are arranged in a plurality of straight lines, the second powder glues 3 are arranged in a plurality of straight lines, and the plurality of first powder glues and the second powder glues are arranged at intervals.

The triangles represent the first powder glue 2 , and the squares represent the second powder glue 3 .

The first powder glue 2 and the second powder glue 3 are arranged on the back of the leather 1 at intervals along the longitudinal direction, and the spacing arrangement enables the first powder glue 2 and the second powder glue 3 to be evenly distributed on the back of the leather 1, avoiding the wrapping process between the center and the steering wheel.

Optionally, the first powder glue 2 and the second powder glue 3 may also be arranged at intervals along the lateral direction, or at irregular intervals.

Further, there is a PU foam layer between the leather and the rim part, the leather and the PU foam layer are directly bonded, the PU foam layer is bonded to the rim part, and the PU foam layer increases the operating feel of the steering wheel.

Optionally, the PU foam layer can also be replaced with a latex layer, or a sponge layer, or other elastic layers.

Embodiment 2:

In an embodiment of the present invention, the steering wheel leather wrapping method includes the following steps:

Pre-coating the first powder glue and the second powder glue on the back of the leather, the melting point of the first powder glue is lower than the melting point of the second powder glue;

Heat the leather to the first set temperature, melt the first powder glue, and then glue the leather to the steering wheel;

As shown in FIG. 1 , the steering wheel includes an annular rim portion, and the leather 1 needs to be wrapped around the outside of the rim portion for decoration and comfort.

Two kinds of glue are pre-coated on the back of the leather 1, namely the first powder glue and the second powder glue. Since the first powder glue and the second powder glue are both in powder form, they can be sprayed by machine, and manual glue brushing is no longer required. , the leather covering efficiency is improved, and the manufacturing cost is reduced.

Before the leather is bonded to the steering wheel, it is heated to the first set temperature. The first set temperature is greater than the melting point of the first powder glue and less than the melting point of the second powder glue, so that the first powder glue melts, and the second powder glue melts. It is still powdery without melting.

After the first powder glue is melted, it is pre-bonded with the steering wheel to realize the preliminary bonding and fixing of the leather and the steering wheel.

When the steering wheel is heated to the second set temperature, since the second set temperature is higher than the first set temperature and also higher than the melting point of the second powder glue, the second powder glue is melted, so that the leather and the steering wheel are more firmly adhered combine.

Preferably, the melting point of the first powder glue is 40-60°C. The highest melting point of the second powder glue is 100-120°C.

In some embodiments of the present invention, when the leather is heated to the first set temperature, a low-temperature heat drying gun is used to heat the leather.

Due to the low melting point of the first powder glue, only the first powder glue is heated with a low-temperature heat gun during coating, the heating time is short, and the temperature of the first powder glue and the leather is low, which is convenient for workers to wrap the leather on the steering wheel and solve the problem of leather The problem of hot hands also improves the coating efficiency.

In some embodiments of the present invention, when the steering wheel is heated to the second set temperature, the steering wheel is placed in a high temperature chamber for heating.

The first powder glue can realize the problem of leather wrapping, but in order to solve the environmental experiment requirements of the steering wheel, it is also necessary to ensure that the glue will not completely melt and lose its viscosity and peel off under high temperature. Therefore, a second powder glue is also compounded on the back of the leather, which optimizes the existing coating process.

When heated to the second set temperature, the second set temperature may reduce the viscosity of the first powder glue. The second powder glue will not lose its viscosity and peel off at the second set temperature, so that the leather and the steering wheel are more firmly bonded.

Further, the first powder glue and the second powder glue are hot melt glue.

The first powder glue and the second powder glue can be the existing conventional hot melt glue, and there will be no reaction between the first powder glue and the second powder glue.

The type of the first powder glue and the second powder glue may be PA/PES/TPU or the like.

In some embodiments of the present invention, the first powder glue and the second powder glue may also be special hot-melt glues. When the second powder glue is melted, the first powder glue is also melted, and a gap occurs between the first powder glue and the second powder glue. Polymerization to form a stronger adhesive.

In some embodiments of the present invention, before heating the leather to the first set temperature, the following steps are further included:

Cut the leather into skins;

Sew the leather pieces into an aprons;

Put the apron over the steering wheel.

The first powder glue and the second powder glue are coated on a whole piece of leather, and the first powder glue and the second powder glue are not sticky before heating. Then the whole piece of leather is cut and processed to make a plurality of leather pieces, which are then sewn into leather loops, and finally the leather loops are put on the steering wheel.

Further, before the step of heating the steering wheel to the second set temperature, the aprons are sewn. At this time, the apron has been covered and bonded with the steering wheel by the melted first powder glue, and then the end of the apron is sewn with the apron itself, so that the apron is completely wrapped on the rim of the steering wheel.

Finally, the steering wheel is heated to the second set temperature to further firmly bond the back of the apron to the steering wheel.

As shown in Figure 4, the steering wheel leather wrapping method in a preferred embodiment of the present invention includes the following steps:

Step 01: Pre-coat the first powder glue and the second powder glue on the back of the leather, the melting point of the first powder glue is lower than the melting point of the second powder glue;

Step 02: Cut the leather into skin pieces;

Step 03: Sew the leather pieces into aprons;

Step 04: Put the apron on the steering wheel;

Step 05: Heat the leather to the first set temperature, melt the first powder glue, and then glue the aprons to the steering wheel;

Step 06: Sew the apron;

Step 07: Heating the steering wheel to a second set temperature, which is higher than the first set temperature, and melting the second powder glue to further bond the apron to the steering wheel.

This embodiment not only satisfies the steering wheel leather coating process, but also the solution that meets the harsh environmental test requirements of the automobile steering wheel:

1) In order to solve the problem of leather covering, we compound a low melting point first powder glue on the back of the leather. Due to the low melting point of the first powder glue, only a low-temperature heat gun is used to heat the glue during coating, the heating time is short, and the temperature of glue and leather is low, which is convenient for workers to wrap the leather on the PU foam layer of the steering wheel, which solves the problem of leather hot. problem, and improve the coating efficiency.

2) In order to solve the environmental test requirements of the steering wheel, we need to ensure that the glue of the steering wheel will not completely melt and lose its viscosity and peel off at high temperature. Therefore, a second powder glue is compounded on the back of the leather to optimize the existing coating process.

3) Due to the introduction of the first powder glue and the second powder glue, manual glue brushing is no longer required, the leather coating efficiency is also improved, and the manufacturing cost is greatly reduced.

What has been described above is only the principles and preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, on the basis of the principle of the present invention, several other modifications can also be made, which should also be regarded as the protection scope of the present invention.

Claims

A method for wrapping steering wheel leather, comprising the following steps:

Pre-coating a first powder glue and a second powder glue on the back of the leather, the melting point of the first powder glue is lower than the melting point of the second powder glue;

heating the leather to a first set temperature, melting the first powder glue, and then bonding the leather to the steering wheel;

The steering wheel is heated to a second set temperature, and the second set temperature is higher than the first set temperature, and the second powder glue is melted to further bond the leather to the steering wheel.
The steering wheel leather wrapping method according to claim 1, wherein the melting point of the first powder glue is 40-60°C.
The steering wheel leather wrapping method according to claim 1, wherein the highest melting point of the second powder glue is 100-120°C.
The steering wheel leather wrapping method according to claim 1, characterized in that, when heating the leather to the first set temperature, a low-temperature heat drying gun is used to heat the leather.
The steering wheel leather wrapping method according to claim 1, wherein when the steering wheel is heated to the second set temperature, the steering wheel is put into a high temperature room for heating.
The steering wheel leather wrapping method according to claim 1, wherein the first powder glue and the second powder glue are hot melt glue.
The steering wheel leather wrapping method according to claim 1, wherein before heating the leather to the first set temperature, the method further comprises the following steps:

cutting the leather into skins;

sewing the flaps into aprons;

Put the apron over the steering wheel.
The steering wheel leather wrapping method according to claim 7, characterized in that, before the step of heating the steering wheel to the second set temperature, the aprons are sewn.
A steering wheel, comprising a ring-shaped rim portion and a leather covering the outside of the rim portion, characterized in that the back of the leather is pre-coated with a first powder glue and a second powder glue, and the first powder glue is The melting point is lower than the melting point of the second powder glue, and the leather is bonded to the outside of the rim portion through the first powder glue and the second powder glue.
The steering wheel according to claim 9, wherein the first powder glue and the second powder glue are coated on the back of the leather at intervals.
The steering wheel according to claim 10, wherein the first powder glue is arranged in a plurality of straight lines, the second powder glue is arranged in a plurality of straight lines, and a plurality of the first powder glue and the second powder glue are arranged in a plurality of straight lines. The powder glue is spaced apart.
The steering wheel according to claim 9, wherein a PU foam layer is further provided between the leather and the rim portion, the leather and the PU foam layer are directly bonded, and the PU foam layer is The layer is bonded to the rim portion.