CN110815694A

CN110815694A - Foam self-skinning process and device thereof

Info

Publication number: CN110815694A
Application number: CN201910910366.5A
Authority: CN
Inventors: 郑晓菲
Original assignee: Feike Machinery (fujian) Co Ltd
Current assignee: Feike Machinery (fujian) Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-02-21

Abstract

The invention discloses a foam self-skinning process and a device thereof. The method comprises the following steps: (1) forming a foam blank through primary foaming; (2) carrying out secondary foaming on the surface of the foam green body; (3) the bubbles on the surface of the foam body collapse and are pressed into a firm skin. The problem of because of the insufficient foam foaming influences skinning quality and efficiency is solved.

Description

Foam self-skinning process and device thereof

Technical Field

The invention relates to the technical field of foam processing, in particular to a foam self-skinning process and a device thereof.

Background

The self-skinning foam plastic is also called integral skin molding foam, forms a solid skin on the surface of the foam by one time when the foaming component foams, and is widely applied to the fields of automobile steering wheels, armrests, bicycle saddles, headrests and the like with the advantages of tear resistance, high strength, high toughness and the like. The firm outer skin is mainly generated due to physical action, bubbles generated by foam and accumulated heat are collided with the low-temperature mold wall, and the bubbles are broken because heat is discharged, so that the bubble wall is pressed into the firm outer skin until the input heat and the output heat are balanced.

The existing self-skinning process only carries out one-time foaming, so that the problems of uneven and insufficient foaming are easily caused, and the phenomenon of foam collapse is caused, so that the later-stage cracking and pressing are influenced, and the skinning forming quality is poor and the efficiency is low.

In view of the above, the applicant has made an intensive study to solve the above problems and has made the present invention.

Disclosure of Invention

The invention mainly aims to provide a self-skinning process, which solves the problem that the skinning quality and efficiency are affected due to insufficient foam foaming.

In order to achieve the above purpose, the solution of the invention is:

a foam self-skinning process comprises the following steps:

(1) forming a foam blank through primary foaming;

(2) carrying out secondary foaming on the surface of the foam green body;

(3) the bubbles on the surface of the foam body collapse and are pressed into a firm skin.

Further, in the step (2), in the second foaming, the foaming temperature is higher than that in the first foaming, and the foaming pressure is higher than that in the first foaming.

Further, in the step (1), a foaming mold is used for carrying out primary foaming, first steam is introduced into the foaming cavity in the foaming process for carrying out primary foaming, and a foam green body is formed; in the step (2), introducing second steam into the foaming cavity to perform second foaming on the surface of the foam blank; wherein the second steam has a higher temperature and a higher pressure than the first steam.

Further, in the step (3), the foaming mold is cooled to reduce the temperature of the surface of the foam blank, so that the bubbles are broken.

Further, in the steps (1) and (2), the pressure of the steam entering the foaming chamber is regulated by a pressure regulating valve.

Further, the foaming mold is provided with a steam inlet, the steam inlet is provided with an air inlet pipeline, and the air inlet pipeline is provided with a pressure regulating valve; in the step (2), the pressure of the steam entering the foaming cavity from the air inlet pipeline is increased through the pressure regulating valve.

Further, the foaming mould comprises a first mould plate and a second mould plate which are matched with each other; the foaming mould is also provided with a steam outlet; the steam inlet comprises a first inlet arranged on the first template and a second inlet arranged on the second template; the steam outlet comprises a first outlet arranged on the first template and a second outlet arranged on the second template; the air inlet pipeline comprises a first air inlet pipe connected with the first inlet port and a second air inlet pipe connected with the second inlet port; the pressure regulating valve comprises a first pressure regulating valve arranged on the first air inlet pipe and a second pressure regulating valve arranged on the second air inlet pipe;

in the step (2), the second outlet is kept in an open state, the first outlet is kept in a closed state, then the first air inlet pipe is opened, the first pressure regulating valve is operated, and the pressure of steam entering the foaming cavity from the first air inlet pipe is increased; then keeping the second outlet in a closed state and the first outlet in an open state, then opening the second air inlet pipe, operating the second pressure regulating valve, and increasing the pressure of the steam entering the foaming cavity from the first air inlet pipe; and carrying out secondary foaming on the surface of the foaming green body.

Further, in the step (1), the second outlet is kept in an open state, the first outlet is kept in a closed state, and then the first air inlet pipe is opened to enable steam to enter the foaming cavity from the first air inlet pipe; keeping the second outlet in a closed state, keeping the first outlet in an open state, and then opening the second air inlet pipe to enable steam to enter the foaming cavity from the second air inlet pipe; the expanded beads are subjected to a first expansion.

Further, in the step (2), a second type of steam is introduced into the foaming cavity through an additional steam pipe.

Further, the foaming mould comprises a first mould plate and a second mould plate which are matched with each other; the first template is provided with a first steam inlet, a second steam inlet and a first steam outlet, and the second template is provided with a third steam inlet, a fourth steam inlet and a second steam outlet;

in the step (2), keeping the second steam outlet in an open state and the first steam outlet in a closed state, then opening the second steam inlet, and introducing second steam into the foaming cavity; then keeping the second steam outlet in a closed state, keeping the first steam outlet in an open state, then opening the fourth steam inlet, and introducing second steam into the foaming cavity; and carrying out secondary foaming on the surface of the foaming green body.

Further, in the step (1), the second steam outlet is kept in an open state, the first steam outlet is kept in a closed state, then the first steam inlet is opened, and first type of steam is introduced into the foaming cavity; then keeping the second steam outlet in a closed state and the first steam outlet in an open state, then opening the third steam inlet, and introducing the first type of steam into the foaming cavity; the expanded beads are subjected to a first expansion.

To this end, the invention also provides a foam skinning device, wherein: the foaming mold is provided with a steam inlet, the steam inlet is provided with an air inlet pipeline, and the air inlet pipeline is provided with a pressure regulating valve.

Further, the foaming mould comprises a first mould plate and a second mould plate which are matched with each other; the foaming mould is also provided with a steam outlet; the steam inlet comprises a first inlet arranged on the first template and a second inlet arranged on the second template; the steam outlet comprises a first outlet arranged on the first template and a second outlet arranged on the second template; the air inlet pipeline comprises a first air inlet pipe connected with the first inlet port and a second air inlet pipe connected with the second inlet port; the pressure regulating valve comprises a first pressure regulating valve arranged on the first air inlet pipe and a second pressure regulating valve arranged on the second air inlet pipe.

The invention also provides another foam self-skinning device which comprises a foaming mould and an additional steam pipeline for introducing second steam into the foaming mould.

Further, the foaming mould comprises a first mould plate and a second mould plate which are matched with each other; the first die plate is provided with a first steam inlet port, a second steam inlet port and a first steam outlet port, and the second die plate is provided with a third steam inlet port, a fourth steam inlet port and a second steam outlet port.

After adopting the structure, the invention relates to a foam self-cleaning leather process and a process thereof, compared with the prior art, the scheme has two different foaming processes, firstly high-temperature steam is input into a foaming cavity for the first time, a plurality of foaming particles are subjected to the first foaming to form a complete foam blank body, then steam with higher temperature is input into the foaming cavity for the second time, at the moment, the steam can not enter the interior of the foam blank in a large quantity, therefore, the foam blank body is foamed for the second time only on the surface of the foam blank body, so that the surface of the foam blank body is foamed more fully, larger, more and more uniform bubbles are formed on the surface of the foam blank body, the foam collapse phenomenon is reduced, the skinning quality is improved, and because more heats are accumulated to the bubble, when colliding with the mould wall of same microthermal, the two have bigger difference in temperature to accelerate the bubble to break, make the skinning form fast, promote skinning efficiency.

Drawings

FIG. 1 is a schematic structural view of a first embodiment of a foam skinning device according to the present invention;

fig. 2 is a schematic structural diagram of a second embodiment of a foam skinning device according to the present invention.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

The scheme provides a foam self-skinning process, which comprises the following steps:

(1) forming a foam blank through primary foaming;

(2) carrying out secondary foaming on the surface of the foam green body;

(3) the bubbles on the surface of the foam body collapse and the cell walls are pressed into a firm skin.

In the step (2), in the second foaming process, the foaming temperature is higher than the temperature of the first foaming process, and the foaming pressure is higher than the pressure of the first foaming process.

In the step (1), a foaming mold is used for carrying out primary foaming, first steam is introduced into a foaming cavity in the foaming process for carrying out primary foaming, and a foam blank body is formed; in the step (2), introducing second steam into the foaming cavity to perform second foaming on the surface of the foam blank; wherein the second steam has a higher temperature and a higher pressure than the first steam.

The foaming mold is cooled in the two foaming processes, and the cooling system is the structure of the existing foam self-skinning device and is not described herein again. The foaming mould is cooled to reduce the temperature of the surface of the foam blank, so that the bubbles are broken.

So, the main innovation of present case lies in, twice foaming process has, at first time input high temperature steam toward foaming appearance intracavity, a plurality of foaming granule carries out first foaming and forms a complete foam body, then the second time toward foaming appearance intracavity input higher temperature steam, the inside of foam body can't get into in a large number to steam this moment, consequently only can carry out the foaming of second time on foam body surface, make foam body surface foaming more abundant, guarantee that foam body surface forms bigger more even bubble, reduce the collapse bubble phenomenon, the skinning quality has been improved, and because more heats are accumulated to the bubble, when bumping with the same microthermal mould wall, the two has the bigger difference in temperature, thereby accelerate the bubble to break, make the skinning form fast, promote skinning efficiency.

In the present case, there are two embodiments for realizing the secondary self-skinning, and two devices are designed accordingly, and the two processes and devices are described below.

As a first embodiment of the present disclosure, as shown in fig. 1, a foam skinning apparatus includes a foaming mold having a steam inlet, an air inlet pipe provided with an air inlet pipe, and a pressure regulating valve provided on the air inlet pipe.

The foaming mold comprises a first mold plate 100 and a second mold plate 200 which are matched, and the first mold plate 100 and the second mold plate 200 are covered to form a foaming cavity; the foaming mould is also provided with a steam outlet; the steam inlet comprises a first inlet 101 arranged on the first template 100 and a second inlet 201 arranged on the second template 200; the steam outlet comprises a first outlet 102 arranged on the first template 100 and a second outlet 202 arranged on the second template 200; the air inlet pipeline comprises a first air inlet pipe 103 connected with the first inlet port 101 and a second air inlet pipe 203 connected with the second inlet port 201; the pressure regulating valves include a first pressure regulating valve 104 provided in the first intake pipe 103 and a second pressure regulating valve 204 provided in the second intake pipe 203.

In the steps (1) and (2), the pressure of the steam entering the foaming chamber is regulated by a pressure regulating valve. According to the fact that the temperature and the pressure of the saturated steam pressure are in a proportional relation, in the step (2), the pressure of the steam entering the foaming cavity through the air inlet pipeline is increased through the pressure regulating valve, so that the temperature of the steam is also increased, and the steam finally entering the foaming cavity is the second type of steam.

More specifically, the operation steps of the whole process are that the pressure regulating valve is closed, first steam is introduced into the air inlet pipe, in the step (1), the second outlet 202 is kept in an open state, the first outlet 102 is kept in a closed state, then the first air inlet pipe 103 is opened, and the first steam enters the foaming cavity from the first air inlet pipe 103 to foam one side; keeping the second outlet 202 in a closed state and the first outlet 102 in an open state, and then opening the second air inlet pipe 203 to enable the first steam to enter the foaming cavity from the second air inlet pipe 203 to foam the other side; thus, the foaming particles are foamed for the first time to form a foaming blank body.

Then opening the pressure regulating valve, continuing to introduce second steam into the air inlet pipe, in the step (2), keeping the second outlet 202 in an open state, keeping the first outlet 102 in a closed state, then opening the first air inlet pipe 103, operating the first pressure regulating valve 104, increasing the pressure of the steam in the foaming cavity of the first air inlet pipe 103, converting the first steam into the second steam, and foaming the outer surface of one side of the foaming blank body; then keeping the second outlet 202 in a closed state, keeping the first outlet 102 in an open state, then opening the second air inlet pipe 203, operating the second pressure regulating valve 204, increasing the pressure of the steam entering the foaming cavity from the first air inlet pipe 103, converting the first steam into the second steam, and foaming the outer surface of the other side of the foaming body; thus, the surface of the foaming blank is foamed for the second time.

In the implementation, after the first foaming is completed through the first steam, the pressure of the first steam is directly increased through the pressure regulating valve, so that the temperature of the first steam is increased, the first steam is directly converted into the second steam, and the second foaming on the surface of a foaming blank is completed.

As a second embodiment of the present disclosure, as shown in fig. 2, the foam skinning apparatus further includes a foaming mold and an additional steam pipeline for introducing a second type of steam into the foaming mold.

The foaming mold comprises a first mold plate 300 and a second mold plate 400 which are matched, and the first mold plate 300 and the second mold plate 400 are covered to form a foaming cavity; the first mold plate 300 is provided with a first steam inlet port 301, a second steam inlet port 302, and a first steam outlet port 303, and the second mold plate 400 is provided with a third steam inlet port 401, a fourth steam inlet port 402, and a second steam outlet port 403.

More specifically, in the step (1), the second steam outlet 403 is kept in an open state, the first steam outlet 303 is kept in a closed state, and then the first steam inlet 301 is opened to introduce the first type of steam into the foaming cavity to foam one side; then keeping the second steam outlet 403 in a closed state and the first steam outlet 303 in an open state, then opening the third steam inlet 401, introducing the first steam into the foaming cavity, and foaming the other side; the expanded beads are subjected to a first expansion.

In the step (2), the second steam outlet 403 is kept in an open state, the first steam outlet 303 is kept in a closed state, then the second steam inlet 302 is opened, second type of steam is introduced into the foaming cavity, and the outer surface of one side of the foaming blank is foamed; then keeping the second steam outlet 403 in a closed state, keeping the first steam outlet 303 in an open state, then opening the fourth steam inlet 402, introducing second steam into the foaming cavity, and foaming the outer surface of the other side of the foaming blank body; and carrying out secondary foaming on the surface of the foaming green body.

In this embodiment, directly let in second kind steam toward foaming appearance intracavity through additional steam line, so first kind steam and second kind steam enter into foaming appearance chamber through different steam inlet ports respectively, and it has the advantage of convenient detection and control, avoids repeatedly controlling the air-vent valve, better maintains the precision of steam temperature and pressure, more is favorable to stabilizing the foaming quality.

It should be noted that, the steam outlet and the steam inlet of the present invention are both the same as the existing foam skinning device, and need to be provided with a steam valve. In addition, the numerical parameters of the steam temperature and the steam pressure are set according to the actual requirements.

The above embodiments and drawings are not intended to limit the form and style of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.

Claims

1. The foam self-skinning process is characterized by comprising the following steps:

(1) forming a foam blank through primary foaming;

(2) carrying out secondary foaming on the surface of the foam green body;

2. The foam skinning process of claim 1 wherein: in the step (2), in the second foaming process, the foaming temperature is higher than the temperature of the first foaming process, and the foaming pressure is higher than the pressure of the first foaming process.

3. The foam skinning process of claim 2 wherein: in the step (1), a foaming mold is used for carrying out primary foaming, first steam is introduced into a foaming cavity in the foaming process for carrying out primary foaming, and a foam blank body is formed; in the step (2), introducing second steam into the foaming cavity to perform second foaming on the surface of the foam blank; wherein the second steam has a higher temperature and a higher pressure than the first steam.

4. The foam skinning process of claim 2 wherein: in the step (3), the foaming mold is cooled to reduce the temperature of the surface of the foam blank, so that the bubbles are broken.

5. The foam skinning process of claim 3 wherein: in the steps (1) and (2), the pressure of the steam entering the foaming chamber is regulated by a pressure regulating valve.

6. The foam skinning process of claim 5 wherein: the foaming mould is provided with a steam inlet, the steam inlet is provided with an air inlet pipeline, and the air inlet pipeline is provided with a pressure regulating valve; in the step (2), the pressure of the steam entering the foaming cavity from the air inlet pipeline is increased through the pressure regulating valve.

7. The foam skinning process of claim 6 wherein: the foaming mould comprises a first template and a second template which are matched with each other; the foaming mould is also provided with a steam outlet; the steam inlet comprises a first inlet arranged on the first template and a second inlet arranged on the second template; the steam outlet comprises a first outlet arranged on the first template and a second outlet arranged on the second template; the air inlet pipeline comprises a first air inlet pipe connected with the first inlet port and a second air inlet pipe connected with the second inlet port; the pressure regulating valve comprises a first pressure regulating valve arranged on the first air inlet pipe and a second pressure regulating valve arranged on the second air inlet pipe;

8. The foam skinning process of claim 7 wherein: in the step (1), the second outlet is kept in an open state, the first outlet is kept in a closed state, and then the first air inlet pipe is opened to enable steam to enter the foaming cavity from the first air inlet pipe; keeping the second outlet in a closed state, keeping the first outlet in an open state, and then opening the second air inlet pipe to enable steam to enter the foaming cavity from the second air inlet pipe; the expanded beads are subjected to a first expansion.

9. The foam skinning process of claim 3 wherein: in the step (2), introducing second steam into the foaming cavity through an additional steam pipe.

10. The foam skinning process of claim 9 wherein: the foaming mould comprises a first template and a second template which are matched with each other; the first template is provided with a first steam inlet, a second steam inlet and a first steam outlet, and the second template is provided with a third steam inlet, a fourth steam inlet and a second steam outlet;