CN110900937B - Manufacturing method of anti-static foamed pearl cotton - Google Patents

Abstract

The invention discloses a method for manufacturing antistatic foamed pearl cotton, which comprises the following steps: 1) mixing low-density polyethylene, a nucleating agent and an anti-shrinking agent according to a set proportion, putting the mixture into a high-pressure reaction kettle, heating the mixture to a first set temperature, and stirring the mixture; 2) injecting a carbon dioxide foaming agent, and continuously stirring until the carbon dioxide foaming agent and the carbon dioxide foaming agent are fully mixed; 3) opening an extrusion port, allowing the first mixture extruded from the extrusion port to enter a closed flat temperature reduction bin, injecting carbon dioxide into the temperature reduction bin to keep the interior of the temperature reduction bin at a second set pressure, and spraying low-temperature water to the bin wall of the temperature reduction bin to reduce the temperature; 4) the second mixture is extruded from a discharge door of the temperature reduction bin, and is cooled in an air blowing mode to obtain a third mixture, namely the foamed pearl cotton; 5) covering antistatic films on two sides of the third mixture to obtain antistatic foamed pearl cotton; 6) and after cutting edges, rolling the anti-static foamed pearl cotton.

Description

Manufacturing method of anti-static foamed pearl cotton

Technical Field

The invention relates to a manufacturing process of pearl wool, in particular to a manufacturing process of anti-static foamed pearl wool.

Background

Polyethylene (PE) has good physical, chemical and mechanical properties and is a widely used industrial material. Polyethylene foam is a non-crosslinked closed cell structure, also known as EPE pearl cotton, and is widely used as a packaging material. It is produced by low-density polyethylene through foaming process and has countless bubble structure. The packaging material has the advantages of water resistance, moisture resistance, shock resistance, sound insulation, heat preservation, plasticity, high toughness and the like, and is an ideal packaging material. At present, the pearl cotton is produced by a screw extrusion mode, and the produced pearl cotton has low closed pore rate and low strength due to the high-speed shearing force of the screw; in addition, the existing production process causes low surface density and high gas escape rate of most pearl cotton, and the service life of the pearl cotton is shortened.

Disclosure of Invention

In order to overcome the problems, the invention provides high-quality anti-static foamed pearl cotton and a process thereof.

The technical scheme of the invention is to provide a method for manufacturing antistatic foamed pearl wool, which comprises foamed pearl wool and antistatic films covered on two sides of the foamed pearl wool, and is characterized by comprising the following steps:

1) mixing low-density polyethylene, a nucleating agent and an anti-shrinking agent according to a set proportion, putting the mixture into a high-pressure reaction kettle, heating the mixture to a first set temperature, and stirring the mixture, wherein the high-pressure reaction kettle is kept at a first set pressure;

2) injecting a carbon dioxide foaming agent, and continuously stirring until the carbon dioxide foaming agent and the carbon dioxide foaming agent are fully mixed to obtain a first mixture;

3) opening an extrusion opening, feeding the first mixture extruded from the extrusion opening into a closed flat temperature reduction bin, injecting carbon dioxide into the temperature reduction bin to keep the interior of the temperature reduction bin at a second set pressure, and spraying low-temperature water onto the wall of the temperature reduction bin to reduce the temperature of the wall of the temperature reduction bin to a second set temperature, so as to obtain a second mixture;

4) the second mixture is extruded from a discharge door of the temperature reduction bin, and is cooled in an air blowing mode to obtain a third mixture, namely the foamed pearl cotton;

5) covering antistatic films on two sides of the third mixture to obtain antistatic foamed pearl cotton;

6) and after cutting edges, rolling the anti-static foamed pearl cotton.

Preferably, the first set temperature is greater than the melting point of the low density polyethylene; the first set pressure is 2000-2500 kpa.

Preferably, the nucleating agent is talc.

Preferably, the anti-contraction agent is monoglyceride.

Preferably, the discharge door of the temperature reduction bin is provided with two heating roller pairs, and the third mixture is extruded out from between the two heating roller pairs.

The manufacturing method of the anti-static foamed pearl cotton adopts a decompression extrusion mode, avoids using an extruder, adopts reasonable decompression and cooling processes, effectively improves the surface density of the pearl cotton, and reduces the gas escape rate, thereby obtaining the anti-static foamed pearl cotton with high strength and excellent performance.

Drawings

FIG. 1 is a schematic process flow diagram of the preferred embodiment of the present invention.

Detailed Description

The following describes in further detail embodiments of the present invention.

As shown in fig. 1, the present invention provides a method for manufacturing antistatic foamed pearl wool, wherein the antistatic foamed pearl wool comprises foamed pearl wool, and antistatic films are covered on both sides of the foamed pearl wool, the method comprises the following steps:

1) mixing low-density polyethylene, a nucleating agent and an anti-shrinking agent in amixing bin 8 according to a set proportion, putting the mixture into a high-pressure reaction kettle 10, heating the mixture to a first set temperature, stirring the mixture, and keeping the high-pressure reaction kettle 10 at a first set pressure;

2) injecting a carbon dioxide foaming agent, and continuously stirring until the carbon dioxide foaming agent and the carbon dioxide foaming agent are fully mixed to obtain a first mixture;

3) opening the extrusion port, allowing the first mixture extruded from the extrusion port to enter a closed flattemperature reduction bin 12, keeping the interior of thetemperature reduction bin 12 at a second set pressure by injecting carbon dioxide into thetemperature reduction bin 12, and spraying low-temperature water onto the wall of thetemperature reduction bin 12 to reduce the temperature of the wall of thetemperature reduction bin 12 to a second set temperature, so as to obtain a second mixture;

4) the second mixture is extruded from a discharge door of thetemperature reduction bin 12, and is cooled in an air blowing mode to obtain a third mixture, namely the foamed pearl cotton;

5) covering the anti-static films on the two sides of the third mixture through a film covering machine to obtain anti-static foamed pearl cotton;

6) after cutting the edges, the antistatic foamed pearl wool is rolled up by arolling machine 16. Among them, the laminator and the winder are well known and conventional machine apparatuses, and both of them can be generally completed in one apparatus.

Wherein the first set temperature is greater than the melting point of the low density polyethylene; the first set pressure is 2000 to 2500 kpa. The second set temperature is 80-100 ℃; the second set pressure was 2000 kpa. According to the invention, proper pressure reduction foaming and surface cooling treatment are realized through setting the temperature and the pressure, and repeated tests show that the surface foaming and surface cooling agent can obtain excellent indexes of compact surface, complete development of internal bubbles, low broken porosity and the like.

Preferably, the nucleating agent is talc or other conventional nucleating agents. The antishrinking agent is monoglyceride or other conventional antishrinking agent.

Preferably, the discharge door of thedesuperheating bin 12 is provided with two heatedpair rollers 14, and the third mixture is extruded between the two heatedpair rollers 14.

The above embodiment is only one embodiment of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (5)

1. The manufacturing method of the anti-static foamed pearl wool is characterized by comprising the following steps of:

1) mixing low-density polyethylene, a nucleating agent and an anti-shrinking agent according to a set proportion, putting the mixture into a high-pressure reaction kettle, heating the mixture to a first set temperature, and stirring the mixture, wherein the high-pressure reaction kettle is kept at a first set pressure;

2) injecting a carbon dioxide foaming agent, and continuously stirring until the carbon dioxide foaming agent and the carbon dioxide foaming agent are fully mixed to obtain a first mixture;

3) opening an extrusion opening, feeding the first mixture extruded from the extrusion opening into a closed flat temperature reduction bin, injecting carbon dioxide into the temperature reduction bin to keep the interior of the temperature reduction bin at a second set pressure, and spraying low-temperature water onto the wall of the temperature reduction bin to reduce the temperature of the wall of the temperature reduction bin to a second set temperature, so as to obtain a second mixture;

4) the second mixture is extruded from a discharge door of the temperature reduction bin, and is cooled in an air blowing mode to obtain a third mixture, namely the foamed pearl cotton;

5) covering antistatic films on two sides of the third mixture to obtain antistatic foamed pearl cotton;

6) and after cutting edges, rolling the anti-static foamed pearl cotton.

2. The method for manufacturing the antistatic foamed pearl wool according to claim 1, wherein the method comprises the following steps: the first set temperature is greater than the melting point of the low density polyethylene; the first set pressure is 2000-2500 kpa.

3. The method for manufacturing the antistatic foamed pearl wool according to claim 1, wherein the method comprises the following steps: the nucleating agent is talcum powder.

4. The method for manufacturing the antistatic foamed pearl wool according to claim 1, wherein the method comprises the following steps: the antishrinking agent is monoglyceride.

5. The method for manufacturing the antistatic foamed pearl wool according to claim 1, wherein the method comprises the following steps: and the discharge door of the temperature reduction bin is provided with two heating roller pairs, and the third mixture is extruded out from between the two heating roller pairs.

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