High-efficiency PE soft film heat recovery production system and process

Abstract

The invention relates to a high-efficiency PE soft film heat recovery production system which comprises a film processing device, a semi-finished product processing device and a cooling and drying device, and the film processing device comprises a raw material supply device, a blow molding device, a cooling cavity, a corona device and a material receiving device which are arranged in sequence. The semi-finished product processing device comprises printing equipment, a drying cavity, slitting equipment, weighing equipment and packaging equipment which are connected with the material receiving equipment and are sequentially arranged; the cooling and drying device comprises a cooling device communicated with the cooling cavity, a drying device communicated with the drying cavity and a heat exchanger enabling the cooling device and the drying device to conduct heat exchange, heat generated by cooling exchanges heat with the drying device in the printing and drying process, and a printed film is dried. And the ink is ensured to be dry, and energy consumption in the drying process can be remarkably reduced.

Description

Technical Field

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

[0002] Polyethylene (PE) soft film has been widely used in packaging, agriculture, construction and other fields due to its excellent physical properties. The traditional PE soft film production process mainly includes blowing, cooling, corona treatment and printing. However, there is still room for improvement in the existing production system when it comes to printing.

[0003] Mainly in the printing process, the printed PE film needs to be dried by hot air to ensure that the ink is completely dry. This process requires a lot of heat energy, which is usually provided by an external heat source, increasing production costs.

[0004] At the same time, the waste heat generated during the cooling process is usually discharged directly into the environment and is not effectively recovered and utilized. If this waste heat can be effectively recovered, it can significantly reduce the energy consumption in the drying process. Summary of the invention

[0005] In response to the above problems, this application proposes a high-efficiency PE soft film heat recovery production system and process, aiming to reduce production costs, reduce energy waste and achieve efficient use of energy through integrated cooling and heat recovery technology.

[0006] To achieve the above objectives, this application adopts the following technical solutions:

[0007] In the first aspect, the present 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 film processing device comprises a raw material supply device, a blow molding device, a cooling chamber, a corona device, and a material receiving device which are arranged in sequence;

[0009] The semi-finished product processing device includes a printing device, a drying chamber, a slitting device, a weighing device, and a packaging device which are connected to the material receiving device and arranged in sequence;

[0010] The cooling and drying device includes a cooling device communicating with the cooling cavity, a drying device communicating with the drying cavity, and a heat exchanger for performing heat exchange between the cooling device and the drying device.

[0011] The present application divides the film processing device that generates heat and the semi-finished product processing device that requires heat for drying into sections, and exchanges the heat generated by cooling the blow-molded film before corona and material collection with the drying equipment during printing and drying, thereby drying the printed film to ensure that the ink is dry, which can significantly reduce energy consumption during the drying process.

[0012] In some possible implementations, the cooling chamber adopts a cooling water circulation cooling method, the cooling device is a cooling water circulation pump, and the drying device is a hot air drying device.

[0013] In some possible implementations, the heat exchanger is an air-water heat exchanger, which does not require the installation of complex equipment, and only requires the power of hot air drying of the printing equipment to complete the heat exchange.

[0014] In some possible implementations, the cooling chamber is provided with a first temperature sensor, and the cooling water circulation pump is provided with a temperature-controlled water replenisher, which can adjust the replenishment of cooling water according to the sensed temperature of the first temperature sensor to achieve the cooling effect in the cooling chamber.

[0015] In a preferred embodiment, the temperature-controlled water make-up device is disposed at the rear end of the heat exchanger.

[0016] In some possible implementations, the drying chamber is provided with a second temperature sensor, and the hot air drying device is provided with a temperature control heater, which can adjust the hot air heating according to the sensed temperature of the second temperature sensor to complete the printing drying in the drying chamber.

[0017] In a preferred embodiment, the temperature control heater is disposed at the rear end of the heat exchanger.

[0018] In the second aspect, the present application provides a high-efficiency PE soft film heat recovery production process, including the use of a high-efficiency PE soft film heat recovery production system as described above to sequentially carry out the processes of resin raw material supply, extrusion film blowing, cooling, corona treatment, winding, printing and labeling, drying, rewinding and slitting, and packaging.

[0019] In the second aspect, in some possible implementations, the cooling temperature is 20-30°C, and the drying temperature is 60-80°C.

[0020] In some possible implementations, the process further includes sampling and analyzing after winding and unwinding, and weighing the product after unwinding and / or after rewinding and slitting. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 This is a schematic diagram of the production process of high-efficiency PE soft film heat recovery in this case. DETAILED DESCRIPTION

[0023] The features of the present invention and other related features are further described in detail below through embodiments to facilitate understanding by those skilled in the art:

[0024] The production of traditional PE (polyethylene) film usually includes the supply of raw materials, blow molding of the raw materials, and cooling. The commonly used cooling method is to transport the blown film over a long distance through rollers, and the air medium can also be used as a carrier to cool it during the process. In some areas, cooling water can also be used as a medium for cooling. After that, the film is rolled up, rewound, slit, weighed and packaged.

[0025] In addition, in some PE (polyethylene) film customization, there will be printing requirements such as logos. At this time, the film will be printed and dried, and pre-treated in its front-end process for the printing effect. As a pre-treatment method, corona treatment is a method to increase the surface energy of plastics. This method can increase the adhesion of materials to inks, glues, etc., thereby improving the printing or bonding effect.

[0026] Therefore, these film processing equipment and semi-finished product processing equipment used on PE (polyethylene) films 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 integrates cooling and heat recovery in the printing and drying process of PE (polyethylene) film customization, so as to reduce production costs, reduce energy waste and achieve efficient use of energy.

[0028] Please refer to Figure 1 The present application discloses a high-efficiency PE soft 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 comprises a raw material supply device, a blow molding device, a cooling chamber, a corona device, and a material receiving device arranged in sequence. The semi-finished product processing device comprises a printing device, a drying chamber, a slitting device, a weighing device, and a packaging device connected to the material receiving device and arranged in sequence.

[0029] The cooling and drying device includes a cooling device connected to the cooling chamber, preferably the cooling chamber adopts a cooling water circulation cooling method, and the cooling device is a cooling water circulation pump. In specific implementation, when the cooling chamber adopts a cooling water circulation cooling method, a method that can be selected is to circulate cooling water on the rollers conveying the film to cool in a contact manner.

[0030] Normally, after leaving the blow molding process, the PE film is quickly cooled to about room temperature, with a cooling temperature of 20-30°C. This is to ensure that the film will not deform or have other physical properties changed due to excessively high temperatures during subsequent processing.

[0031] To this end, a first temperature sensor is provided in the cooling chamber to sense the temperature of the film after cooling, and a temperature-controlled water replenisher is provided in the cooling water circulation pump to adjust the replenishment of cooling water according to the sensed temperature of the first temperature sensor to achieve the cooling effect in the cooling chamber.

[0032] The cooling and drying device also includes a drying device connected to the drying chamber, and the drying device is a hot air drying device. The printed film is dried by hot air, and the hot air drying using air as a medium can achieve uniform drying effect. The drying temperature is preferably 60-80°C, and a second temperature sensor is provided in the drying chamber. The hot air drying device is provided with a temperature control heater, which can adjust the hot air heating according to the sensing temperature of the second temperature sensor to complete the printing drying in the drying chamber.

[0033] The cooling and drying device also includes a heat exchanger for heat exchange between the cooling device and the drying device. Preferably, the heat exchanger is an air-water heat exchanger, which does not require the installation of complex equipment and can complete the heat exchange by simply using the power of hot air drying of the printing device.

[0034] Preferably, the temperature-controlled water replenisher as described above is arranged at the rear end of the heat exchanger, so that the circulating cooling water is subjected to heat exchange before cold water compensation, thereby improving energy efficiency. On the contrary, if water mixing is performed before heat exchange, the heat exchange efficiency is reduced.

[0035] Furthermore, the temperature-controlled water replenisher is arranged at the rear end of the heat exchanger to perform temperature compensation without hindering the heat exchange. It should be explained here that in other embodiments, there is also a form of cooling the air of the hot air drying equipment before heat exchange. However, the emphasis of this application is on improving the overall efficiency. Cooling down first and then exchanging will make secondary use of the energy for cooling down, and its efficiency is bound to be lower than that of post-heating. Therefore, this case is a high-efficiency PE soft film heat recovery production system that utilizes conventional cooling, that is, cooling to room temperature of 20 to 30°C and conventional drying temperature of 60 to 80°C, and uses an air-water heat exchanger that is easy to set up to maximize energy recovery.

[0036] In this way, the film processing equipment that generates heat and the semi-finished product processing equipment that requires heat for drying are divided into sections as a whole, and the heat generated by cooling the blow-molded film before corona and material collection is exchanged with the drying equipment during printing and drying, so as to dry the printed film and ensure that the ink is dry, which can significantly reduce the energy consumption in the drying process.

[0037] The present application also provides a production process using the above high-efficiency PE soft film heat recovery production system. The processes of resin raw material supply, film blowing, cooling, corona treatment, winding, printing and labeling, drying, rewinding and slitting, and packaging are carried out in sequence, wherein 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 steps of sampling and analyzing after winding and unwinding, and weighing the product after unwinding and / or after rewinding and slitting.

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

Claims

1. A high-efficiency PE soft film heat recovery production system, characterized in that: It includes film processing equipment, semi-finished product processing equipment, cooling and drying equipment; The film processing device comprises a raw material supply device, a blow molding device, a cooling chamber, a corona device, and a material receiving device which are arranged in sequence; The semi-finished product processing device includes a printing device, a drying chamber, a slitting device, a weighing device, and a packaging device which are connected to the material receiving device and arranged in sequence; The cooling and drying device includes a cooling device communicating with the cooling cavity, a drying device communicating with the drying cavity, and a heat exchanger for performing heat exchange between the cooling device and the drying device.

2. A high-efficiency PE soft film heat recovery production system as claimed in claim 1, characterized in that: The cooling chamber adopts 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. A high-efficiency PE soft film heat recovery production system as claimed in claim 2, characterized in that: The heat exchanger is an air-water heat exchanger.

4. A high-efficiency PE soft film heat recovery production system as claimed in claim 3, characterized in that: The cooling chamber is provided with a first temperature sensor, and the cooling water circulation pump is provided with a temperature-controlled water replenisher.

5. A high-efficiency PE soft film heat recovery production system as claimed in claim 4, characterized in that: The temperature-controlled water make-up device is arranged at the rear end of the heat exchanger.

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

7. A high-efficiency PE soft film heat recovery production system as claimed in claim 6, characterized in that: The temperature control heater is disposed at the rear end of the heat exchanger.

8. A high-efficiency PE soft film heat recovery production process as claimed in claim 1, characterized in that: The method comprises applying a high-efficiency PE soft film heat recovery production system as described in any one of claims 1 to 7 to sequentially carry out the processes of resin raw material supply, film extrusion and blowing, cooling, corona treatment, winding, printing and labeling, drying, rewinding and slitting, and packaging.

9. A high-efficiency PE soft film heat recovery production process as claimed in claim 8, characterized in that: The cooling temperature is 20-30°C, and the drying temperature is 60-80°C.

10. A high-efficiency PE soft film heat recovery production process as claimed in claim 8, characterized in that: It also includes the steps of sampling and analyzing after winding and unwinding, and weighing the product after unwinding and / or after rewinding and slitting.

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