A three-layer film composite polyethylene heavy overcoat production equipment and method

Abstract

The application discloses a kind of three-layer film composite polyethylene heavy film production equipment and method, including first extruder, second extruder, third extruder and three-layer co-extrusion roller group, wherein the first extruder is used to extrude first layer body, second extruder is used to extrude second layer body, third extruder is used to extrude third layer body, the first layer body, second layer body and third layer body all pass through three-layer co-extrusion roller group to form three-layer composite film, the three-layer composite film sequentially passes through symmetrically distributed guide roller and fourth temperature control roller group and is rolled by winding mechanism;And, the second layer body is located between the first layer body and the third layer body;Further including shaping roller group, it is set in the discharge end of the second extruder, for the surface of the second layer body is constructed multiple supermicro bottom protrusions and multiple supermicro top protrusions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of film production, in particular to a three-layer film composite polyethylene heavy coating film production equipment and method. BACKGROUND

[0002] The FFS heavy coating film is a packaging film suitable for FFS (form-fill-seal, automatic packaging system), which is specially used for high-speed automatic packaging machines and is a soft packaging film for packaging granular and powdery solid products. The FFS blow molding film bag is easy to recycle, meets environmental protection requirements, and has excellent comprehensive performance in packaging, storage, transportation, moisture resistance and appearance, etc., and conforms to the requirements and trends of international product packaging. It has become a commonly used heavy packaging film product in European countries. In China, it is also becoming a new packaging method adopted by large petrochemical enterprises, gradually replacing traditional composite film woven bags.

[0003] At present, when producing heavy coating films, an extruder is often used. In the prior art, when providing material for the extruder, multiple materials are often directly put into a mixing bin for uniform mixing. The mixing bin has a large volume and needs continuous rotary stirring to achieve real-time uniformity, which is relatively energy-consuming as a whole.

[0004] In addition, the stiffness and heat seal strength of the heavy coating film produced based on the existing heavy coating film production process are often barely up to standard, and the overall performance index is low.

[0005] Therefore, it is necessary to provide a three-layer film composite polyethylene heavy coating film production equipment and method to solve the problems raised in the background. SUMMARY

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a three-layer film composite polyethylene heavy coating film production equipment, comprising a first extruder, a second extruder, a third extruder and a three-layer co-extrusion roller group, wherein the first extruder is used to extrude a first layer, the second extruder is used to extrude a second layer, and the third extruder is used to extrude a third layer. The first layer, the second layer and the third layer all pass through the three-layer co-extrusion roller group to form a three-layer composite film. The three-layer composite film passes through symmetrically distributed guide rollers and a fourth temperature control roller group in turn and is wound by a winding mechanism.

[0007] The first extruder is supplied by a first mixing bin, the second extruder is supplied by a second mixing bin, and the third extruder is supplied by a third mixing bin. The first mixing bin, the second mixing bin and the third mixing bin can continuously supply material in the form of small quantities.

[0008] Moreover, the second layer is located between the first layer and the third layer.

[0009] Further, a shaping roller set is arranged at the discharge end of the second extruder, for constructing a plurality of ultra-micro bottom protrusions and a plurality of ultra-micro top protrusions on the surface of the second layer body.

[0010] Further, as a preferred embodiment, the shaping roller set comprises a first shaping roller and a second shaping roller, both of which can rotate around their own axes, the surface of the first shaping roller is distributed with a plurality of first protrusions and a plurality of first recesses, and the surface of the second shaping roller is distributed with a plurality of second recesses corresponding to the first protrusions and a plurality of second protrusions corresponding to the first recesses.

[0011] Further, as a preferred embodiment, the first layer body passes through the first reversing roller set and the first temperature control roller set and then enters the three-layer co-extrusion roller set.

[0012] The third layer body passes through the third reversing roller set and the third temperature control roller set and then enters the three-layer co-extrusion roller set.

[0013] Further, as a preferred embodiment, the first temperature control roller set is used to keep the temperature of the first layer body the same as that of the second layer body.

[0014] The third temperature control roller set is used to keep the temperature of the third layer body the same as that of the second layer body.

[0015] Further, as a preferred embodiment, the first reversing roller set and the third reversing roller set have the same structure, the first reversing roller set comprises a mounting frame and a base roller, the base roller is rotatably arranged on the mounting frame, and a first roller body is rotatably arranged on the left side of the base roller, a third roller body is rotatably arranged at the bottom of the base roller, and a second roller body is rotatably arranged on the right side of the base roller.

[0016] Further, as a preferred embodiment, the first mixing bin, the second mixing bin, and the third mixing bin have the same structure,

[0017] The second mixing bin comprises an outer bin body, an inner bin body, and a rotating shaft, the inner bin body is embedded into the outer bin body and a gap is formed between the inner bin body and the outer bin body, the rotating shaft is rotatably arranged in the inner bin body and is driven by an external motor, four partition plates are uniformly fixed on the rotating shaft, the four partition plates can divide the inner bin body into four independent spaces, a feeding pipe is arranged above the inner bin body, and a discharging pipe is arranged below the inner bin body.

[0018] Further, as a preferred embodiment, the rotating shaft rotates clockwise, and a preheating pipe is arranged on the left inner wall of the outer bin body.

[0019] Further, as a preferred embodiment, the rotating shaft rotates clockwise, and a plurality of second magnets are uniformly distributed on the right inner wall of the outer bin body.

[0020] The first magnet is connected to the partition plate by two circumferential springs and a radial spring, and the first magnet and the second magnet are arranged to be mutually adsorbed.

[0021] Further, as preferred, the winding end side of the winding mechanism is further provided with a detection mechanism.

[0022] A production method of a three-layer composite polyethylene heavy wrapping film, comprising the following steps:

[0023] S1. Open the first mixing bin, the second mixing bin and the third mixing bin, so that they can continuously supply the material in small quantities;

[0024] S2. Open the first extruder, which receives the material from the first mixing bin and extrudes the first layer, which passes through the first reversing roller group and the first temperature control roller group in turn and then enters the three-layer co-extrusion roller group; open the third extruder, which receives the material from the third mixing bin and extrudes the third layer, which passes through the third reversing roller group and the third temperature control roller group in turn and then enters the three-layer co-extrusion roller group;

[0025] S3. Open the second extruder, which receives the material from the second mixing bin and extrudes the second layer, which passes through the shaping roller group and then enters the three-layer co-extrusion roller group, and the shaping roller group can construct a plurality of super-micro bottom protrusions and a plurality of super-micro top protrusions on the surface of the second layer;

[0026] S4. The first layer, the second layer and the third layer all pass through the three-layer co-extrusion roller group to form a three-layer composite film, which passes through the symmetrically distributed guide rollers and the fourth temperature control roller group in turn and is then wound by the winding mechanism.

[0027] Compared with the prior art, the present application provides a three-layer composite polyethylene heavy wrapping film production device and method, which has the following advantages:

[0028] 1. In the embodiment of the present application, the three-layer composite film can greatly improve the stiffness and heat seal strength of the film;

[0029] 2. In the embodiment of the present application, the continuous and interval feeding of the multiple feeding bins can realize the continuous feeding of the material in small quantities, and the material is mixed in real time in the independent space, which is beneficial to improve the uniformity of the mixing, greatly reduces the power requirement of the mixing bin, and is beneficial to reduce energy consumption;

[0030] 3. In the embodiment of the present application, the position adjustment of the four independent spaces can be realized by rotating the rotating shaft, so that the material bodies can be received and released in sequence, and the material bodies can be well mixed during the receiving and releasing processes.

[0031] 4. In the embodiment of the present application, the anchoring area between the second layer and the first layer and between the second layer and the third layer can be increased by constructing a plurality of super-micro bottom protrusions and a plurality of super-micro top protrusions, the combination effect is improved, and the first layer and the third layer can maintain the flatness of the outer surface of the three-layer composite film. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a three-layer film composite polyethylene heavy coating production equipment;

[0033] Figure 2 It is a structural schematic diagram of a first reversing roller group in a three-layer film composite polyethylene heavy coating production equipment;

[0034] Figure 3 It is a structural schematic diagram of a feeding bin and a screw feeding mechanism in a three-layer film composite polyethylene heavy coating production equipment;

[0035] Figure 4 It is a structural schematic diagram of a second mixing bin in a three-layer film composite polyethylene heavy coating production equipment;

[0036] Figure 5 It is a structural schematic diagram of a first layer, a second layer and a third layer in a three-layer film composite polyethylene heavy coating production equipment;

[0037] In the figure: 1, first extruder; 2, first mixing bin; 3, first reversing roller group; 4, first temperature control roller group; 5, second extruder; 6, second mixing bin; 7, three-layer co-extrusion roller group; 8, third extruder; 9, third mixing bin; 10, third reversing roller group; 11, third temperature control roller group; 12, guide roller; 13, fourth temperature control roller group; 14, shaping roller group; 16, detection mechanism; 17, winding mechanism; 18, feeding bin; 19, screw feeding mechanism; 20, collecting pipe; 21, first layer; 22, second layer; 23, third layer; 24, bottom protrusion; 25, top protrusion; 31, mounting frame; 32, base roller; 33, first roller body; 34, second roller body; 35, third roller body; 61, outer bin body; 63, inner bin body; 64, rotating shaft; 65, partition plate; 66, feeding pipe; 67, discharging pipe; 68, first magnet; 69, circumferential spring; 610, radial spring; 611, second magnet. DETAILED DESCRIPTION

[0038] Embodiment 1: Please refer to Figures 1-5The embodiment of the application discloses a three-layer film composite polyethylene heavy coating film production device, which comprises a first extruder 1, a second extruder 5, a third extruder 8 and a three-layer co-extrusion roller group 7, wherein the first extruder 1 is used for extruding a first layer body 21, the second extruder 5 is used for extruding a second layer body 22, and the third extruder 8 is used for extruding a third layer body 23; the first layer body, the second layer body and the third layer body pass through the three-layer co-extrusion roller group 7 to form a three-layer composite film,

[0039] In the embodiment, the three-layer composite film can greatly improve the stiffness and heat sealing strength of the film.

[0040] In addition, in the embodiment, the characteristics of the polyethylene raw materials are considered in the raw material application design, and the metallocene polyethylene, linear low-density polyethylene, high-density polyethylene, low-density polyethylene and additives are blended.

[0041] The raw material use design scheme is as follows:

[0042] The third layer body is selected from linear low-density polyethylene, low-density polyethylene, metallocene polyethylene and additives.

[0043] The second layer body is selected from high-density polyethylene, linear low-density polyethylene, metallocene polyethylene and additives.

[0044] The first layer body is selected from linear low-density polyethylene, low-density polyethylene, metallocene polyethylene and additives.

[0045] The three-layer film composite process and the optimized cooperation of multiple raw materials are selected, and the multifunctionality of the film is given, which meets the quality standard requirements of Q / SH0751-2013 and the requirements of automatic and rapid packaging.

[0046] The three-layer composite film passes through the symmetrically distributed guide rollers 12 and the fourth temperature control roller group 13 in sequence and is wound by the winding mechanism 17.

[0047] The first extruder 1 is supplied by the first mixing bin 2, the second extruder 5 is supplied by the second mixing bin 6, and the third extruder 8 is supplied by the third mixing bin 9; the first mixing bin, the second mixing bin and the third mixing bin can continuously supply the material in the form of small quantities, thereby greatly reducing the energy consumption.

[0048] It should be explained that in the prior art, when the material is supplied to the extruder, multiple materials are directly put into the mixing bin for uniform mixing, the volume of the mixing bin is large, and continuous rotation stirring is required to achieve real-time uniformity, which is relatively energy-consuming, and in the embodiment, the first mixing bin, the second mixing bin and the third mixing bin are respectively provided with a plurality of small mixing bins. Figure 3 and 4The first mixing bin 2, the second mixing bin 6 and the third mixing bin 9 have the same structure,

[0049] The second mixing bin 6 comprises an outer bin body 61, an inner bin body 63 and a rotating shaft 64, wherein the inner bin body 63 is embedded into the outer bin body 61 and a gap is formed between the inner bin body 63 and the outer bin body 61, the rotating shaft 64 is rotatably arranged in the inner bin body 63, the rotating shaft 64 is driven by an external motor, four partition plates 65 are uniformly fixed on the rotating shaft 64, the four partition plates 65 can divide the inner bin body 63 into four independent spaces, a feeding pipe 66 is arranged above the inner bin body 63 and a discharging pipe 67 is arranged below the inner bin body 63.

[0050] In addition, the feeding pipe 66 is also connected with the collecting pipe 20, the collecting pipe 20 is connected with a plurality of screw feeding mechanisms 19, the feeding port of the screw feeding mechanism 19 is connected with the feeding bin 18, and the screw feeding mechanism 19 can accurately and intervally feed the material;

[0051] That is to say, the continuous and interval feeding of the plurality of feeding bins 18 can realize the continuous feeding of the material in small quantities, the material is mixed in real time in the independent space, so that the uniformity of the mixing is improved, the power requirement of the mixing bin is greatly reduced, and the energy consumption is reduced;

[0052] In the implementation, the position adjustment of the four independent spaces can be realized by driving the rotating shaft to rotate, so that the material is received and released in sequence, and the material can be well mixed during the receiving and releasing processes.

[0053] As a preferred embodiment, the rotating shaft 64 rotates clockwise, and the preheating pipe is arranged on the left inner wall of the outer bin body.

[0054] As a preferred embodiment, the rotating shaft 64 rotates clockwise, and a plurality of second magnets 611 are uniformly distributed on the right inner wall of the outer bin body.

[0055] A first magnet 68 is arranged between the adjacent two partition plates 65, the first magnet 68 is connected with the partition plate 65 by two circumferential springs 69 and a radial spring 610, and the first magnet and the second magnet are arranged in mutual adsorption.

[0056] It should be explained that when the partition plate 65 rotates, the first magnet 68 will shake, and the shaking effect of the first magnet can be improved by the guidance of the second magnet, thereby improving the mixing effect.

[0057] In the embodiment, the first layer body is located between the second layer body and the third layer body. Figure 5

[0058] ​Further comprising a shaping roller set 14 arranged at the discharge end of the second extruder 5, for constructing a plurality of super-micro bottom protrusions 24 and a plurality of super-micro top protrusions 25 on the surface of the second layer body, in particular, the shaping roller set 14 comprises a first shaping roller and a second shaping roller, both of which can rotate around their own axes, the surface of the first shaping roller is distributed with a plurality of first protrusions and a plurality of first recesses, the surface of the second shaping roller is distributed with a plurality of second recesses corresponding to the first protrusions, and a plurality of second protrusions corresponding to the first recesses;

[0059] By constructing a plurality of super-micro bottom protrusions 24 and a plurality of super-micro top protrusions 25, the anchoring area between the second layer body and the first layer body, and the second layer body and the third layer body can be increased, the bonding effect can be improved, and the first layer body and the third layer body can maintain the flatness of the outer surface of the three-layer composite film.

[0060] In this embodiment, the first layer body 21 passes through the first reversing roller set 3 and the first temperature control roller set 4 and then enters the three-layer co-extrusion roller set 7;

[0061] The third layer body 23 passes through the third reversing roller set 10 and the third temperature control roller set 11 and then enters the three-layer co-extrusion roller set 3.

[0062] In addition, the first temperature control roller set 4 is used to keep the temperature of the first layer body 21 the same as that of the second layer body;

[0063] The third temperature control roller set 11 is used to keep the temperature of the third layer body 23 the same as that of the second layer body.

[0064] In fact, the first temperature control roller set 4 and the third temperature control roller set 11 have the same structure, which includes a plurality of temperature control rollers, which are actually hollow structures, and a temperature control liquid is injected into the hollow cavities, and the temperature of the temperature control rollers is adjusted by adjusting the temperature of the temperature control liquid.

[0065] In addition, as Figure 2 The first reversing roller set 3 and the third reversing roller set 10 have the same structure, the first reversing roller set 3 includes a mounting frame 31 and a base roller 32, the base roller 32 is rotatably arranged on the mounting frame 31, and a first roller body 33 is rotatably arranged on the left side of the base roller 32, a third roller body 35 is rotatably arranged at the bottom of the base roller 32, and a second roller body 34 is rotatably arranged on the right side of the base roller 32.

[0066] By configuring the base roller 32, the first roller body, the second roller body, and the third roller body, the film can be well flattened and reversed;

[0067] As a preferred embodiment, the winding mechanism 17 is further provided with a detection mechanism 16 on one side of the winding end.

[0068] Embodiment 1: Please refer to Figures 1-5 In the embodiment of the present application, a production method of a three-layer composite polyethylene heavy film is provided, comprising the following steps:

[0069] S1. Open the first mixing bin, the second mixing bin and the third mixing bin, so that they can continuously supply material in small quantities;

[0070] S2. Open the first extruder, which receives material from the first mixing bin and extrudes the first layer 21, which enters the three-layer co-extrusion roller group 7 after passing through the first reversing roller group 3 and the first temperature control roller group 4 in turn; open the third extruder, which receives material from the third mixing bin and extrudes the third layer 23, which enters the three-layer co-extrusion roller group 7 after passing through the third reversing roller group 10 and the third temperature control roller group 11 in turn;

[0071] S3. Open the second extruder, which receives material from the second mixing bin and extrudes the second layer 22, which enters the three-layer co-extrusion roller group 7 after passing through the shaping roller group 14, which can construct a plurality of ultra-micro bottom protrusions 24 and a plurality of ultra-micro top protrusions 25 on the surface of the second layer;

[0072] S4. The first layer, the second layer and the third layer all pass through the three-layer co-extrusion roller group 7 to form a three-layer composite film, which is wound by the winding mechanism 17 after passing through the symmetrically distributed guide rollers 12 and the fourth temperature control roller group 13 in turn.

[0073] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A three-layer film-coated polyethylene overwrap production apparatus, characterized by: The application relates to a three-layer composite film production device, which comprises a first extruder (1), a second extruder (5), a third extruder (8) and a three-layer co-extrusion roller group (7), wherein the first extruder (1) is used for extruding a first layer (21), the second extruder (5) is used for extruding a second layer (22), the third extruder (8) is used for extruding a third layer (23), the first layer, the second layer and the third layer pass through the three-layer co-extrusion roller group (7) to form a three-layer composite film, the three-layer composite film passes through symmetrically distributed guide rollers (12) and a fourth temperature control roller group (13) in sequence and is wound by a winding mechanism (17). The first extruder (1) is supplied with materials by a first mixing bin (2), the second extruder (5) is supplied with materials by a second mixing bin (6), and the third extruder (8) is supplied with materials by a third mixing bin (9); the first mixing bin, the second mixing bin and the third mixing bin can continuously supply materials in the form of small quantities. The second layer is located between the first layer and the third layer. The device further comprises a shaping roller group (14) arranged at the material outlet end of the second extruder (5) and used for constructing a plurality of super-micro bottom protrusions (24) and a plurality of super-micro top protrusions (25) on the surface of the second layer. The first layer (21) passes through a first reversing roller group (3) and a first temperature control roller group (4) and then enters the three-layer co-extrusion roller group (7). The third layer (23) passes through a third reversing roller group (10) and a third temperature control roller group (11) and then enters the three-layer co-extrusion roller group (7). The first mixing bin (2), the second mixing bin (6) and the third mixing bin (9) have the same structure. The second mixing bin (6) comprises an outer bin body (61), an inner bin body (63) and a rotating shaft (64), wherein the inner bin body (63) is embedded into the outer bin body (61) and a gap is formed between the inner bin body (63) and the outer bin body (61); the rotating shaft (64) is arranged in the inner bin body (63) and is driven by an external motor; four partition plates (65) are uniformly fixed on the rotating shaft (64); the four partition plates (65) can divide the inner bin body (63) into four independent spaces; a feeding pipe (66) is arranged above the inner bin body (63) and a discharging pipe (67) is arranged below the inner bin body (63). The rotating shaft (64) rotates clockwise; a plurality of second magnets (611) are arranged on the right inner wall of the outer bin body (61) and are uniformly distributed. A first magnet (68) is arranged between two adjacent partition plates (65); the first magnet (68) is connected with the partition plate (65) by two circumferential springs (69) and a radial spring (610); the first magnet and the second magnet are arranged in a mutual adsorption mode.

2. A three layer thin film composite polyethylene overcoat production apparatus as claimed in claim 1, wherein: The shaping roller group (14) comprises a first shaping roller and a second shaping roller; the first shaping roller and the second shaping roller can rotate around their own axes; the surface of the first shaping roller is provided with a plurality of first protrusions and a plurality of first recesses; the surface of the second shaping roller is provided with a plurality of second recesses corresponding to the first protrusions and a plurality of second protrusions corresponding to the first recesses.

3. A three layer thin film composite polyethylene overcoat production apparatus as defined in claim 1, wherein: The first temperature control roller group (4) is used for keeping the temperature of the first layer (21) same as the temperature of the second layer; The third temperature control roller group (11) is used for keeping the temperature of the third layer (23) same as the temperature of the second layer.

4. The apparatus for producing a three-layer thin film composite polyethylene overcoat of claim 1, wherein: The first reversing roller group (3) and the third reversing roller group (10) are same in structure, the first reversing roller group (3) comprises a mounting frame (31) and a base roller (32), the base roller (32) is rotatably arranged on the mounting frame (31), and a first roller body (33) is rotatably arranged on the left side of the base roller (32), a third roller body (35) is rotatably arranged on the bottom of the base roller (32), and a second roller body (34) is rotatably arranged on the right side of the base roller (32).

5. The apparatus for producing a three-layer thin film composite polyethylene overcoat of claim 1, wherein: The rotating shaft (64) rotates clockwise, and the left inner wall of the outer barrel is provided with a preheating pipe.

6. A three layer thin film composite polyethylene overcoat production apparatus as defined in claim 1, wherein: The winding mechanism (17) is further provided with a detection mechanism (16) on one side of the winding end.

7. A method for producing a three-layer film-composite polyethylene overwrap film using the three-layer film-composite polyethylene overwrap film production apparatus according to any one of claims 1 to 6, characterized by: The method comprises the following steps: S1. opening the first mixing bin, the second mixing bin and the third mixing bin, so that the three can continuously supply material in small quantities; S2. opening the first extruder, which receives material from the first mixing bin and extrudes the first layer (21), the first layer (21) sequentially passes through the first reversing roller group (3) and the first temperature control roller group (4) and then enters the three-layer co-extrusion roller group (7); opening the third extruder, which receives material from the third mixing bin and extrudes the third layer (23), the third layer (23) sequentially passes through the third reversing roller group (10) and the third temperature control roller group (11) and then enters the three-layer co-extrusion roller group (7); S3. opening the second extruder, which receives material from the second mixing bin and extrudes the second layer (22), the second layer (22) passes through the shaping roller group (14) and then enters the three-layer co-extrusion roller group (7), the shaping roller group (14) can construct a plurality of super-micro bottom protrusions (24) and a plurality of super-micro top protrusions (25) on the surface of the second layer; S4. the first layer, the second layer and the third layer all pass through the three-layer co-extrusion roller group (7) to form a three-layer composite film, the three-layer composite film sequentially passes through the symmetrically distributed guide rollers (12) and the fourth temperature control roller group (13) and is wound by the winding mechanism (17).

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