Seven-layer co-extrusion greenhouse film blow molding unit and processing technology thereof

Abstract

The invention relates to the technical field of greenhouse film processing, and discloses a seven-layer co-extrusion greenhouse film blow molding unit which comprises an extrusion plasticator, a filtering device, a seven-layer composite mold forming machine, a blowing, cooling and shaping device, a foam stabilizing device, a clamping plate, an upper traction device, a guide roller, a lower traction device and a winding device. The extrusion plasticizing machine is provided with a filling hopper, the tail part of the extrusion plasticizing machine is provided with a filtering device, and a discharging hole of the filtering device is connected with a feeding hole of the seven-layer composite die forming machine; materials discharged from a discharging port of the seven-layer composite die forming machine sequentially pass through the blowing, cooling and shaping device, the position between the two foam stabilizing devices, the position between the two clamping plates, the upper traction device, the guide roller and the lower traction device, and then are finally wound on the winding device. Compared with the prior art, the seven-layer co-extrusion greenhouse film blow molding unit and the processing technology thereof have the advantages that the seven-layer co-extrusion greenhouse film blow molding unit and the processing technology thereof are provided to adapt to changes of raw materials and master batches, the functionality of a film is increased, the quality of the film is improved, and the product cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of greenhouse film processing, and in particular to a seven-layer co-extrusion greenhouse film blow molding unit and a processing technology thereof. Background Art

[0002] With the development of greenhouse film, the functional requirements are getting higher and higher. The performance of various masterbatches is quite different, which puts higher requirements on the equipment. Due to the mutual interference of various masterbatches, adding different masterbatches in the same layer or adjacent layers will reduce its functionality. At the same time, due to the original distributor, the temperature of a single layer cannot be controlled. Due to the large difference in the melting temperature of various raw materials, it is easy to cause the raw materials with low melting temperature to decompose or reduce their performance, thereby reducing the quality of the film.

[0003] In order to adapt to the changes in raw materials and masterbatches, increase film functionality, improve film quality, and reduce product costs, we propose a seven-layer co-extrusion greenhouse film blowing unit and its processing technology. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above technical difficulties and provide a seven-layer co-extrusion greenhouse film blowing unit and its processing technology, in order to adapt to the changes in raw materials and masterbatch, increase the functionality of the film, improve the quality of the film, and reduce the cost of the product.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A seven-layer co-extrusion greenhouse film blow molding machine unit comprises an extrusion plasticizing machine, a filtering device, a seven-layer composite mold forming machine, an inflation cooling and shaping device, a foam stabilizing device, a clamping plate, an upper traction device, a guide roller, a lower traction device and a winding device; the extrusion plasticizing machine is provided with a filling hopper, a filtering device is installed at the tail, the discharge port of the filtering device is connected with the feed port of the seven-layer composite mold forming machine, and an inflation cooling and shaping device is fixedly installed on the top of the seven-layer composite mold forming machine. The material discharged from the discharge port of the seven-layer composite mold forming machine passes through the inflation cooling and shaping device, between two foam stabilizing devices, between two clamping plates, the upper traction device, the guide roller, and the lower traction device in sequence, and is finally wound onto the winding device.

[0007] A processing technology of the seven-layer co-extrusion greenhouse film blowing machine unit comprises the following steps:

[0008] Step 1, loading the material into an extrusion plasticizing machine for extrusion plasticizing;

[0009] Step 2: After extrusion and plasticization, filter through a filtering device;

[0010] Step 3: Enter into the seven-layer composite mold forming machine, be distributed into seven layers by the distributor therein, and then form the seven-layer composite mold;

[0011] Step 4: The formed material is discharged and cooled and formed after passing through the inflation cooling and forming device;

[0012] Step 5: After the shaped material passes through the foam stabilizing device, it passes between the two clamping plates and is compounded together;

[0013] Step 6: Under the traction of the upper traction device, the guide roller and the lower traction device in sequence, the film is finally rolled up by the rolling device to obtain a rolled greenhouse film.

[0014] The advantages of the present invention compared with the prior art are:

[0015] 1. The present invention adopts a seven-layer central feeding structure. The functional masterbatch of each layer can be separated, and a barrier layer is added to avoid the interference of the functional masterbatch caused by placing it on the same layer, resulting in a decrease in functionality. At the same time, seven layers can increase the function of the greenhouse film compared to three or five layers. When the thickness of the film remains unchanged, the thickness of each layer is reduced, which reduces the amount of masterbatch and reduces the cost of the greenhouse film. For example, the opening agent is generally placed in the inner and outer layers. Since the thickness of the film remains unchanged, the number of layers increases, and the thickness of the inner and outer layers is correspondingly reduced, which reduces the amount of opening agent added and reduces the cost. The current masterbatch includes light conversion, heat preservation, drip defogging, color masterbatch, sterilization and dust removal, light diffusion, barrier, etc., which can realize a function of each layer, and each function can be realized in one product, and the mutual interference of masterbatches caused by placing multiple masterbatches on one layer is avoided. The current defogging film, light diffusion film, and light conversion film can be realized in one product, and a higher-grade greenhouse film can be made. In particular, PO film is now mostly produced by coating and drying, and drying consumes a lot of energy. The seven-layer equipment can change the dripping mist elimination to internal addition, and add it to the inner layer or outer layer alone, so that the dripping mist elimination and film life can be equal. Reduce energy consumption by more than 30%. The seven-layer co-extrusion greenhouse film blowing unit can produce higher-grade and more functional greenhouse films, improve the quality of the film, reduce production costs, save energy, and achieve the purpose of energy saving and consumption reduction.

[0016] 2. The present invention uses seven extruders to feed materials. Different masterbatches are added to each layer. The temperature can be set separately according to the temperature characteristics of the masterbatches. Some masterbatches that are easily decomposed at high temperatures, such as dripping agents, can be extruded at low temperatures. At the same time, the low-speed screw is designed to avoid the high-speed rotation of the screw, which generates shear heat and causes the decomposition of raw materials, thereby improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the working of each extrusion plasticizing machine and the fan in cooperation with the seven-layer composite mold forming machine of the present invention.

[0019] As shown in the figure: 1. Extrusion plasticizing machine; 2. Filtering device; 3. Seven-layer composite mold forming machine; 4. Blowing cooling and shaping device; 5. Clamp; 6. Upper traction device; 7. Winding device; 8. Filling hopper; 9. Foam stabilizing device; 10. Guide roller; 11. Lower traction device. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof are intended to cover non-exclusive inclusions.

[0021] The present invention is further described in detail below in conjunction with the implementation modes and the accompanying drawings.

[0022] A seven-layer co-extrusion greenhouse film blow molding machine unit comprises an extrusion plasticizing machine 1, a filtering device 2, a seven-layer composite mold forming machine 3, an inflation cooling and shaping device 4, a foam stabilizing device 9, a clamping plate 5, an upper traction device 6, a guide roller 10, a lower traction device 11 and a winding device 7; the extrusion plasticizing machine 1 is provided with a stuffing hopper 8, a filtering device 2 is installed at the tail, the discharge port of the filtering device 2 is connected with the feed port of the seven-layer composite mold forming machine 3, and the inflation cooling and shaping device 4 is fixedly installed on the top of the seven-layer composite mold forming machine 3. The material discharged from the discharge port of the seven-layer composite mold forming machine 3 passes through the inflation cooling and shaping device 4, between two foam stabilizing devices 9, between two clamping plates 5, the upper traction device 6, the guide roller 10, and the lower traction device 11 in sequence, and is finally wound onto the winding device 7, and a plurality of guide rollers 10 are sequentially arranged along the discharge direction of the material.

[0023] As a preferred embodiment, the extrusion plasticizing machine 1 and the filtering device 2 are arranged in one-to-one correspondence, and the total number of the two is seven.

[0024] A processing technology of the seven-layer co-extrusion greenhouse film blowing machine unit comprises the following steps:

[0025] Step 1: Load the material into the extrusion plasticizing machine 1 for extrusion plasticizing. The extrusion plasticizing machine 1 works with three fans. Among them, the air inlet and exhaust fans are the air inlet and exhaust fans of the internal cooling part of the inflation cooling and shaping device 4, which are used for cooling and inflation; the fan is the air inlet fan of the external cooling device, which is used for cooling;

[0026] Step 2: After extrusion and plasticization, the mixture is filtered through a filter device 2, and a pressure sensor is provided at the bottom of the filter device 2;

[0027] Step 3: Enter the seven-layer composite mold forming machine 3, and the seven-layer composite mold forming machine 3 is divided into seven layers by the distributor therein, and then the seven-layer composite mold forming machine is performed;

[0028] Step 4: the formed material is discharged and cooled and shaped after passing through the inflation cooling and shaping device 4. The left and right sides of the inflation cooling and shaping device are respectively provided with external cooling air inlet pipes;

[0029] Step 5: After the shaped material passes through the foam stabilizing device 9, it passes between the two clamping plates 5 and is compounded together;

[0030] Step six, under the traction of the upper traction device 6, the guide roller 10 and the lower traction device 11 in sequence (a tension control unit is arranged between the lower traction device 11 and the guide roller 10 and the winding device 7 respectively), it is finally wound up by the winding device 7 to obtain a rolled greenhouse film.

[0031] The multi-component material control and extrusion amount precision control of the present invention, the temperature control and extrusion amount control of the seven sets of extrusion plasticizers 1, the temperature control of the screen changing device and the central feeding, the temperature control of the seven-layer composite mold forming machine, the fan air volume control, and the traction and winding speed control are all controlled by the intelligent control module.

[0032] The greenhouse film prepared by the present invention is divided into outer layer one, outer layer two, outer layer three, middle layer, inner layer three, inner layer two and inner layer one from one side to the other side. The central feeding structure is adopted, and the uniformity is better than the measured feeding, which improves the thickness uniformity of the greenhouse film. The increase in the number of layers increases the difficulty of sealing. The design adopts a bevel sealing structure, which has better sealing and is easy to disassemble and assemble. The design adopts a full-length circular flow channel design, which reduces the dead angle of the flow channel, reduces the time of material change and color change, reduces waste, improves labor efficiency, and reduces production costs. The inner cooling hole of the design is an inclined hole, which increases the diameter of the inner cooling hole, improves the passing rate of the cooling air, and increases the cooling effect, which can increase the output by more than 25%. The double cooling method of internal cooling and external cooling can also increase the production capacity by more than 10%. The linear speed of the greenhouse film is generally set to 25m / min. Through the design of the inclined inner cooling hole and the design of the double cooling method, the linear speed can be designed to be 60m / min, which improves labor productivity.

[0033] The present invention and its embodiments are described above, and such description is not restrictive. If a person skilled in the art is inspired by it and designs an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, it shall fall within the protection scope of the present invention.

Claims

1. A seven-layer co-extrusion greenhouse film blowing machine unit, characterized in that: The invention comprises an extrusion plasticizing machine (1), a filtering device (2), a seven-layer composite mold forming machine (3), an inflation cooling and shaping device (4), a foam stabilizing device (9), a clamping plate (5), an upper traction device (6), a guide roller (10), a lower traction device (11) and a winding device (7); the extrusion plasticizing machine (1) is provided with a filling hopper (8), a filtering device (2) is installed at the tail, the discharge port of the filtering device (2) is connected to the feed port of the seven-layer composite mold forming machine (3), the top of the seven-layer composite mold forming machine (3) is fixedly installed with an inflation cooling and shaping device (4), the material discharged from the discharge port of the seven-layer composite mold forming machine (3) passes through the inflation cooling and shaping device (4), between the two foam stabilizing devices (9), between the two clamping plates (5), the upper traction device (6), the guide roller (10), and the lower traction device (11) in sequence, and is finally wound onto the winding device (7).

2. The seven-layer co-extrusion greenhouse film blowing machine set according to claim 1 is characterized in that: The extrusion plasticizing machine (1) and the filtering device (2) are arranged in one-to-one correspondence, and the total number of the two is seven.

3. The seven-layer co-extrusion greenhouse film blowing machine set according to claim 1 is characterized in that: A plurality of guide rollers (10) are arranged in sequence along the material discharge direction.

4. A processing technology of a seven-layer co-extrusion greenhouse film blowing unit according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1, loading the material into an extrusion plasticizing machine (1) for extrusion plasticizing; Step 2: After extrusion and plasticization, filtering is performed through a filtering device (2); Step 3, entering into the seven-layer composite mold forming machine (3), being distributed into seven layers by the distributor therein, and then being formed into a seven-layer composite mold; Step 4: the formed material is discharged and cooled and formed after passing through the inflation cooling and forming device (4); Step 5: After the shaped material passes through the foam stabilizing device (9), it passes between the two clamping plates (5) and is compounded together; Step six: The film is pulled in sequence by the upper pulling device (6), the guide roller (10) and the lower pulling device (11), and finally rolled up by the rolling device (7), thereby obtaining a rolled greenhouse film.

5. The processing technology of the seven-layer co-extrusion greenhouse film blowing machine set according to claim 4 is characterized in that: The greenhouse film prepared is divided into outer layer one, outer layer two, outer layer three, middle layer, inner layer three, inner layer two and inner layer one from one side to the other side.

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