High-efficiency flexible pe film waste heat recovery production system

Abstract

The present application relates to a high-efficiency flexible PE film waste heat recovery production system, comprising a film processing unit, a semi-finished product processing unit, and a cooling and drying unit; the film processing unit comprises a feedstock supply device, a blown film extrusion device, a cooling cavity, a corona treatment device, and a material take-up device that are sequentially arranged; the semi-finished product processing unit comprises a printing device, a drying cavity, a slitting device, a weighing device, and a packaging device that are sequentially arranged to connect with the material take-up device; the cooling and drying unit comprises a cooling device in communication with the cooling cavity, a drying device in communication with the drying cavity, and a heat exchanger that enables heat exchange between the cooling device and the drying device, allowing heat released during cooling to be exchanged with the drying device during a printing and drying process, so as to dry a printed film and ensure proper drying of ink, thereby significantly reducing energy consumption during drying.

Description

A high-efficiency PE flexible film heat recovery production system and process Technical Field

[0001] This application relates to the field of film production technology for flexible packaging composites, specifically to a high-efficiency PE flexible film heat recovery production system and process technology. Background Technology

[0002] Polyethylene (PE) flexible film is widely used in packaging, agriculture, construction, and other fields due to its excellent physical properties. The traditional production process of PE flexible film mainly includes steps such as blow molding, cooling, corona treatment, and printing. However, existing production systems still have room for improvement in the printing stage.

[0003] The main issue lies in the printing process. After printing, the PE film needs to be dried with hot air to ensure the ink is completely dry. This process requires a significant amount of heat energy, usually provided by an external heat source, which increases production costs.

[0004] Meanwhile, the waste heat generated during the cooling process is usually directly released into the environment without being effectively recovered and utilized. If this waste heat could be effectively recovered, energy consumption during the drying process could be significantly reduced. Technical solutions

[0005] To address the aforementioned issues, this application proposes a high-efficiency PE soft film heat recovery production system and process, aiming to reduce production costs, minimize energy waste, and achieve efficient energy utilization by integrating cooling and heat recovery technologies.

[0006] To achieve the above objectives, the present application adopts the following technical solution:

[0007] In the first aspect, this application provides a high-efficiency PE soft film heat recovery production system, including a film processing device, a semi-finished product processing device, and a cooling and drying device;

[0008] The membrane processing apparatus includes, in sequence, a raw material supply device, a blow molding device, a cooling chamber, a corona discharge device, and a material receiving device;

[0009] The semi-finished product processing device includes printing equipment, drying chamber, slitting equipment, weighing equipment, and packaging equipment arranged sequentially connected to the receiving equipment;

[0010] The cooling and drying device includes a cooling device communicating with the cooling chamber, a drying device communicating with the drying chamber, and a heat exchanger that enables heat exchange between the cooling device and the drying device.

[0011] In some possible implementations, the cooling chamber is cooled by circulating cooling water, the cooling device is a circulating cooling water pump, and the drying device is a hot air drying device.

[0012] In some possible implementations, the heat exchanger is an air-water heat exchanger, which eliminates the need for additional complex equipment and can be completed using the power generated during the hot air drying process of the printing equipment.

[0013] In some possible implementations, the cooling chamber is equipped with a first temperature sensor, and the cooling water circulation pump is equipped with a temperature-controlled water replenisher, which can adjust the replenishment of cooling water according to the temperature sensed by the first temperature sensor to achieve the cooling effect in the cooling chamber.

[0014] In a preferred embodiment, the temperature-controlled water supply device is located at the rear end of the heat exchanger.

[0015] In some possible implementations, the drying chamber is equipped with a second temperature sensor, and the hot air drying equipment is equipped with a temperature control heater, which can adjust the hot air heating according to the temperature sensed by the second temperature sensor to complete the printing drying in the drying chamber.

[0016] In a preferred embodiment, the temperature-controlled heater is located at the rear end of the heat exchanger.

[0017] Secondly, this application provides a high-efficiency PE soft film heat recovery production process, which includes the following steps in sequence using the high-efficiency PE soft film heat recovery production system described above: resin raw material supply, extrusion blowing, cooling, corona treatment, winding, printing markings, drying, rewinding and slitting, and packaging.

[0018] In the second aspect, in some possible embodiments, the cooling temperature is 20~30°C and the drying temperature is 60~80°C.

[0019] In some possible implementations, the process also includes sampling and analysis after winding and unwinding, as well as weighing the product after unwinding and / or rewinding and slitting. Beneficial effects

[0020] This application separates the heat-generating film processing device and the semi-finished product processing device that requires heat for drying into sections. The heat generated by cooling the blow-molded film before corona treatment and material collection is exchanged with the drying equipment during printing drying to dry the printed film and ensure ink drying. This can significantly reduce energy consumption during the drying process. Attached Figure Description

[0021] Figure 1 is a schematic diagram of a high-efficiency PE soft film heat recovery production system in this case.

[0022] Figure 2 is a schematic diagram of the heat recovery production process of a high-efficiency PE soft film in this case. The best embodiment of the present invention

[0023] The following examples further illustrate the features and other related characteristics of the present invention to facilitate understanding by those skilled in the art:

[0024] Traditional PE (polyethylene) film production typically involves raw material supply, blow molding, and cooling. Common cooling methods include long-distance transport of the blow-molded film using rollers, or cooling via air. In some applications, cooling water may be used. Afterward, the film is wound, rewound, slit, weighed, and packaged.

[0025] In addition, some customized PE (polyethylene) films may require logo printing. In this case, the film will be printed and dried, and pre-treatment will be performed in the upstream process to improve the printing effect. One such pre-treatment method is corona treatment, which increases the surface energy of the plastic. This method can increase the adhesion of the material to inks, adhesives, etc., thereby improving the printing or bonding effect.

[0026] Therefore, the film processing equipment and semi-finished product processing equipment used in PE (polyethylene) film are relatively mature equipment, and the specific operation methods of the equipment will not be described in detail in the following description of this application.

[0027] This application mainly focuses on integrating cooling and heat recovery in the printing and drying process of personalized PE (polyethylene) film, in order to reduce production costs, reduce energy waste, and achieve efficient energy utilization.

[0028] Please refer to Figure 1. This application discloses a high-efficiency PE flexible film heat recovery production system, comprising a film processing device, a semi-finished product processing device, and a cooling and drying device. The film processing device includes, in sequence, a raw material supply device, a blow molding device, a cooling chamber, a corona treatment device, and a receiving device. The semi-finished product processing device includes, connected to the receiving device, a printing device, a drying chamber, a slitting device, a weighing device, and a packaging device, all arranged in sequence.

[0029] The cooling and drying device includes a cooling device communicating with the cooling chamber. Preferably, the cooling chamber uses a cooling water circulation cooling method, and the cooling device is a cooling water circulation pump. In specific implementations, when the cooling chamber uses a cooling water circulation cooling method, one option is to circulate cooling water on the rollers that convey the film for contact cooling.

[0030] Typically, after leaving the blow molding process, PE film is rapidly cooled to around room temperature, typically 20-30°C. This is to ensure that the film does not deform or undergo other changes in physical properties due to excessively high temperatures during subsequent processing.

[0031] To this end, a first temperature sensor is installed in the cooling chamber to sense the temperature of the thin film after cooling. A temperature-controlled water replenishment device is installed in the cooling water circulation pump to adjust the supply of cooling water according to the temperature sensed by the first temperature sensor, thereby achieving the desired cooling effect within the cooling chamber.

[0032] The cooling and drying device also includes a drying unit connected to the drying chamber, which is a hot air drying unit. Hot air is used to dry the printed film, and using hot air as the drying medium ensures uniform drying. The preferred drying temperature is 60-80℃. A second temperature sensor is installed in the drying chamber, and the hot air drying unit is equipped with a temperature-controlled heater. The hot air heating can be adjusted according to the temperature sensed by the second temperature sensor to complete the printing drying process within the drying chamber.

[0033] The cooling and drying device also includes a heat exchanger that enables heat exchange between the cooling device and the drying device. Preferably, the heat exchanger is an air-water heat exchanger, which eliminates the need for additional complex equipment; the heat exchange can be completed using the power generated during the hot air drying process of the printing equipment.

[0034] Preferably, the temperature-controlled water replenisher described above is located at the rear end of the heat exchanger, so that the circulating cooling water undergoes heat exchange before being compensated for by cold water, thereby improving energy utilization efficiency. Conversely, if the water is mixed before heat exchange, the heat exchange efficiency is reduced.

[0035] Furthermore, the temperature-controlled water replenishment device is located at the rear end of the heat exchanger to compensate for temperature without hindering heat exchange. It should be noted that other embodiments may involve cooling the airflow from the hot air drying equipment before heat exchange. However, this application emphasizes improving overall efficiency; cooling before heat exchange would involve secondary utilization of the cooled energy, which is inherently less efficient than subsequent heating. Therefore, this application utilizes a conventional cooling system (cooling to room temperature of 20-30°C) and a conventional drying temperature of 60-80°C, employing an easily installed air-water heat exchanger to maximize energy recovery in a high-efficiency PE soft film heat recovery production system.

[0036] In this way, the film processing device that generates heat and the semi-finished product processing device that requires heat for drying are set up in separate sections. The heat generated by cooling the blow-molded film before corona treatment and material collection is exchanged with the drying equipment during printing and drying to dry the printed film and ensure that the ink is dry. This can significantly reduce energy consumption in the drying process.

[0037] This application also provides a production process utilizing the above-mentioned high-efficiency PE soft film heat recovery production system. The process sequentially includes resin raw material supply, extrusion blowing, cooling, corona treatment, winding, marking, drying, rewinding and slitting, and packaging. The temperature of the cooling stage is 20-30°C, and the temperature of the drying stage is 60-80°C.

[0038] Furthermore, it also includes the processes of sampling and analysis after winding and unwinding, as well as weighing the product after unwinding and / or rewinding and slitting.

[0039] As stated above, this case protects a high-efficiency PE soft film heat recovery production system and process, and all technical solutions that are the same as or similar to this case should be considered to fall within the protection scope of this case.

Claims

1. A high-efficiency PE soft film heat recovery production system, characterized in that, Includes membrane processing equipment, semi-finished product processing equipment, and cooling and drying equipment; The membrane processing apparatus includes, in sequence, a raw material supply device, a blow molding device, a cooling chamber, a corona discharge device, and a material receiving device; The semi-finished product processing device includes printing equipment, drying chamber, slitting equipment, weighing equipment, and packaging equipment arranged sequentially connected to the receiving equipment; The cooling and drying device includes a cooling device communicating with the cooling chamber, a drying device communicating with the drying chamber, and a heat exchanger that enables heat exchange between the cooling device and the drying device.

2. The high-efficiency PE soft film heat recovery production system as described in claim 1, characterized in that, The cooling chamber uses a cooling water circulation cooling method, the cooling equipment is a cooling water circulation pump, and the drying equipment is a hot air drying equipment.

3. The high-efficiency PE soft film heat recovery production system as described in claim 2, characterized in that, The heat exchanger is an air-water heat exchanger.

4. The high-efficiency PE soft film heat recovery production system as described in claim 3, characterized in that, The cooling chamber is equipped with a first temperature sensor, and the cooling water circulation pump is equipped with a temperature-controlled water supply device.

5. The high-efficiency PE soft film heat recovery production system as described in claim 4, characterized in that, The temperature-controlled water supply device is located at the rear end of the heat exchanger.

6. The high-efficiency PE soft film heat recovery production system as described in claim 3, characterized in that, The drying chamber is equipped with a second temperature sensor, and the hot air drying equipment is equipped with a temperature control heater.

7. The high-efficiency PE soft film heat recovery production system as described in claim 6, characterized in that, The temperature-controlled heater is located at the rear end of the heat exchanger.

8. The high-efficiency PE soft film heat recovery production process as described in claim 1, characterized in that, The process includes sequentially performing the following steps using a high-efficiency PE soft film heat recovery production system as described in any one of claims 1 to 7: resin raw material supply, extrusion blowing, cooling, corona treatment, winding, printing markings, drying, rewinding and slitting, and packaging.

9. The high-efficiency PE soft film heat recovery production process as described in claim 8, characterized in that, The cooling temperature is 20~30℃, and the drying temperature is 60~80℃.

10. The high-efficiency PE soft film heat recovery production process as described in claim 8, characterized in that, It also includes the process of sampling and analysis after winding and unwinding, as well as weighing the product after unwinding and / or rewinding and slitting.

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