Extrusion apparatus for film production

Abstract

The utility model belongs to the field of film production technology, concretely relates to a kind of extrusion equipment for film production, including adjustable mould, adjustable mould includes shell, the upside of shell is equipped with feed slot, the top end of feed slot is connected with the discharge port of plastic extruder, the below of adjustable mould is provided with winding roller, the bottom end of feed slot is communicated with the discharge slot of shell downside, the bottom of shell on the both sides of discharge slot is rotatably connected with adjustable side plate by hinge, sealing membrane is adhered on the inner wall of discharge slot and adjustable side plate, the bottom of shell is also fixed with outer side plate and end plate, the side of end plate is slidably connected with the front and rear end of adjustable side plate, adjusting assembly is connected between adjustable side plate and outer side plate. The angle of adjustable side plate can be conveniently adjusted by adjusting assembly, so as to change the width of notch formed between two adjustable side plates, to quickly extrude film of different thickness, effectively improve production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of film production technology, and specifically relates to an extrusion device for film production. Background Technology

[0002] In the film production industry, the die of the extrusion equipment is the core component that determines the film thickness. However, current traditional film extrusion dies generally adopt a fixed structure design, and their discharge port width cannot be adjusted once the film is formed. If different thicknesses of film need to be produced, the machine must be stopped and the corresponding die must be replaced. This process has significant efficiency shortcomings: traditional die replacement requires steps such as stopping the machine, disassembling the old die, cleaning the interface, installing the new die, and adjusting parameters. The replacement time for a single die is usually 30-60 minutes. For small-batch, multi-specification film production (such as PE protective film with a thickness of 0.01mm-0.5mm and electronic-grade ultra-thin film), frequent die replacements result in insufficient effective production time, which seriously restricts capacity improvement. At the same time, companies need to stock multiple sets of dies of different specifications to meet diverse needs, which not only increases the cost of die procurement but also requires additional manpower and space for storage and maintenance, further increasing production costs.

[0003] While some simple adjustable molds attempt to adjust the outlet width using shims, their adjustment accuracy and sealing performance have significant defects: the shim thickness specifications are limited (usually spaced at 0.05mm intervals), making continuous and precise adjustment impossible. Furthermore, manual shim replacement can easily lead to uneven gaps on both sides of the outlet due to installation deviations, resulting in a film that is "thicker on one side and thinner on the other" (thickness deviation > ±0.01mm). This makes it difficult to meet the stringent precision requirements of food packaging films, electronic protective films, and other similar applications. In addition, if the movable connections of the adjustable mold are not properly sealed, high-temperature molten materials (such as PE melting temperature 180-220℃ and PVC melting temperature 160-180℃) can easily leak from the gaps. This not only wastes raw materials but may also cause the leaked material to cool and solidify, clogging the mold and requiring machine shutdown for cleaning, further reducing production efficiency. At the same time, the leaked high-temperature material also poses a safety hazard of scalding operators. Utility Model Content

[0004] To address the above problems, the purpose of this utility model is to provide an extrusion device for film production, which solves the technical problems of traditional film extrusion dies having fixed structures that require machine shutdown for die replacement, resulting in low efficiency and high cost, and simple adjustable dies having low adjustment accuracy, unreliable sealing, and easy material leakage.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an extrusion device for film production, comprising an adjustable mold, the adjustable mold comprising an outer shell, an inlet groove provided on the upper side of the outer shell, the top end of the inlet groove being connected to the outlet of a plastic extruder, a take-up roller provided below the adjustable mold, the bottom end of the inlet groove being connected to an outlet groove provided on the lower side of the outer shell, adjustable side plates being rotatably connected to the bottom of the outer shell on both sides of the outlet groove via hinges, a sealing film being adhered to the inner wall of the outlet groove and the adjustable side plate, an outer side plate and an end plate being fixedly provided at the bottom of the outer shell, the front and rear ends of the adjustable side plate being slidably connected to the side of the end plate, and an adjustment assembly being connected between the adjustable side plate and the outer side plate.

[0006] The beneficial effects of this utility model are: the angle of the adjustable side plate can be conveniently adjusted by adjusting the component, thereby changing the width of the groove formed between the two adjustable side plates, so as to quickly extrude films of different thicknesses and effectively improve production efficiency.

[0007] To allow for quick adjustment of the adjustable side panel angle by using the adjustment components;

[0008] As a further improvement to the above technical solution: the adjustment assembly includes a connecting seat and a fixed seat, the connecting seat and the fixed seat are respectively fixed on the adjustable side plate and the outer side plate, a screw is rotatably installed on the connecting seat, the screw is threadedly connected to a connecting block, and pins for rotatably connecting the fixed seat are fixed on both sides of the connecting block, and the axis of the pins is parallel to the axis of the hinge.

[0009] The beneficial effect of this improvement is that the operator can use a tool to rotate the screw, thereby driving the adjustable side plate to rotate around the hinge axis through the helical joint motion generated between the screw and the connecting block, thus changing the angle of the adjustable side plate.

[0010] To ensure the stability of the connection between the screw and the connector;

[0011] As a further improvement to the above technical solution: the connecting seat is a U-shaped plate structure, and limiting plates are fixed on the screws on both sides of the connecting seat.

[0012] The beneficial effects of this improvement are: the limiting plate plays a limiting role, ensuring the stability of the connection between the screw and the connecting seat.

[0013] To effectively prevent molten material from leaking from the connection between the adjustable side plate and the discharge chute by using a sealing membrane;

[0014] As a further improvement to the above technical solution: the sealing film is a polytetrafluoroethylene film structure, and the length of the sealing film is the same as the length of the adjustable side plate, and the sealing film is installed on the outside of the hinge.

[0015] The beneficial effects of this improvement are: the sealing membrane can work stably at the melting temperature of most plastics such as PE and PVC, effectively preventing molten material from leaking from the connection between the adjustable side plate and the discharge chute.

[0016] To ensure uniform extrusion of the material;

[0017] As a further improvement to the above technical solution: the discharge trough is a flat square trough structure, and the facing sides of the two end plates are on the same plane as the inner wall of the discharge trough.

[0018] The beneficial effect of this improvement is that the material can smoothly enter between the two adjustable side plates through the discharge chute and then be extruded and formed.

[0019] To ensure the stability of the adjustment assembly's support for the adjustable side plate;

[0020] As a further improvement to the above technical solution: the number of adjustment components installed on each of the adjustable side plates is two, and the two adjustment components are respectively set at both ends of the adjustable side plate.

[0021] The beneficial effect of this improvement is that the two adjustment components located at the ends of the adjustable side plate can provide stable support for the adjustable side plate.

[0022] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a cross-sectional view of the adjustable mold in this utility model;

[0025] Figure 3 This is a schematic diagram of the adjustable mold in this utility model;

[0026] Figure 4 This is a schematic diagram of the adjustable side plate in this utility model;

[0027] In the diagram: 1. Plastic extruder; 2. Adjustable die; 3. Take-up roller; 4. Outer shell; 5. Feed chute; 6. Discharge chute; 7. Hinge; 8. Adjustable side plate; 9. Sealing film; 10. Adjustment assembly; 101. Connecting seat; 102. Screw; 103. Limiting plate; 104. Connecting block; 105. Fixed seat; 11. Outer side plate; 12. End plate. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0029] Example 1:

[0030] like Figure 1As shown in Figure 4: An extrusion device for film production includes an adjustable mold 2. The adjustable mold 2 includes a housing 4. A feed chute 5 is provided on the upper side of the housing 4. The top of the feed chute 5 is connected to the discharge port of a plastic extruder 1. A take-up roller 3 is provided below the adjustable mold 2. The bottom end of the feed chute 5 is connected to a discharge chute 6 provided on the lower side of the housing 4. Adjustable side plates 8 are rotatably connected to the bottom of the housing 4 on both sides of the discharge chute 6 via hinges 7. A sealing film 9 is adhered to the inner wall of the discharge chute 6 and the adjustable side plate 8. An outer side plate 11 and an end plate 12 are also fixed to the bottom of the housing 4. The front and rear ends of the adjustable side plate 8 are slidably connected. On the side of the end plate 12, an adjustment assembly 10 is connected between the adjustable side plate 8 and the outer side plate 11. The angle of the adjustable side plate 8 can be easily adjusted through the adjustment assembly 10, thereby changing the width of the groove formed between the two adjustable side plates 8 to quickly extrude films of different thicknesses and effectively improve production efficiency. The adjustment assembly 10 includes a connecting seat 101 and a fixing seat 105, which are respectively fixed on the adjustable side plate 8 and the outer side plate 11. A screw 102 is rotatably mounted on the connecting seat 101, and a connecting block 104 is threadedly connected to the screw 102. Rotatable connecting fixing seats are fixed on both sides of the connecting block 104. The pin 105 has its axis parallel to the axis of hinge 7. An operator can use a tool to rotate screw 102, thereby causing the adjustable side plate 8 to rotate around the axis of hinge 7 through the helical motion between screw 102 and connecting block 104, thus changing the angle of the adjustable side plate 8. The connecting seat 101 has a U-shaped plate structure, and limiting plates 103 are fixed on the screws 102 on both sides of the connecting seat 101. The limiting plates 103 serve a limiting function, ensuring the stability of the connection between the screws 102 and the connecting seat 101. The sealing film 9 has a polytetrafluoroethylene (PTFE) film structure, and the length of the sealing film 9 is the same as the length of the adjustable side plate 8. The sealing film 9 covers the hinge 7. On the outside, the sealing film 9 can work stably at the melting temperature of most plastics such as PE and PVC, effectively preventing molten material from leaking from the connection between the adjustable side plate 8 and the discharge trough 6. The discharge trough 6 is a flat square trough structure. The facing sides of the two end plates 12 are on the same plane as the inner wall of the discharge trough 6. The material can smoothly enter between the two adjustable side plates 8 through the discharge trough 6 and then be extruded and formed. The number of adjustment components 10 installed on each adjustable side plate 8 is two, and the two adjustment components 10 are respectively set at both ends of the adjustable side plate 8. The two adjustment components 10 set at the ends of the adjustable side plate 8 can provide stable support for the adjustable side plate 8.

[0031] The working principle of this technical solution is as follows: First, based on the target thickness of the film to be produced, such as 0.1mm, determine the required groove width of the two adjustable side plates 8, such as 0.2mm. The operator uses a wrench to rotate the screw 102 in the adjusting assembly 10. Since the screw 102 and the connecting block 104 are threadedly connected, and the connecting block 104 is rotatably connected to the fixed seat 105 of the outer side plate 11 through a pin, the rotation of the screw 102 will generate an axial thrust, pushing the adjustable side plate 8 to rotate around the axis of the hinge 7. When the left adjustable side plate 8 is adjusted, the right adjusting assembly 10 is adjusted symmetrically at the same time to ensure that the opening angle of the two adjustable side plates 8 is consistent and a uniform groove width is formed. The measurement can be assisted by a feeler gauge, and the accuracy is controlled within ±0.005mm. During this process, the limiting plate 103 on the connecting seat 101 will restrict the axial movement of the screw 102, ensuring that the connection between the screw and the connecting seat is stable during adjustment and avoiding adjustment deviation.

[0032] After adjustment, start the plastic extruder 1 and transport the high-temperature molten material, such as PE or PVC, from the discharge port to the feed trough 5 of the adjustable mold 2. The material flows along the feed trough 5 into the discharge trough 6 below. The discharge trough 6 has a flat square structure, and the side of the end plate 12 is flush with the inner wall of the discharge trough 6, which can guide the material smoothly into the slot between the two adjustable side plates 8 and avoid the material from accumulating in the mold. At the same time, the polytetrafluoroethylene sealing film 9, which is bonded to the inner wall of the discharge trough 6 and the adjustable side plate 8, will tightly fit the gap. Because polytetrafluoroethylene can withstand a high temperature of 260°C, it can completely isolate the molten material and prevent leakage from the connection between the adjustable side plate 8 and the discharge trough 6. In addition, the sealing film 9 covers the outside of the hinge 7, further preventing material leakage at the hinge.

[0033] If you need to change the film thickness specification, such as switching from 0.1mm to 0.2mm, there is no need to stop the machine: First, appropriately reduce the feeding speed of the plastic extruder 1 to reduce the material pressure in the mold, and then repeat the operation of step 1—rotate the screw 102 of the adjusting component 10 to increase the groove width of the two adjustable side plates 8, such as from 0.2mm to 0.4mm. During the adjustment process, the front and rear ends of the adjustable side plates 8 slide smoothly along the side of the end plate 12 to ensure that the groove width is uniform; after the adjustment is completed, restore the feeding speed, and you can continue to extrude the film of the new thickness. The entire specification switching process can be completed within 5 minutes; the extruded film will be synchronously wound up by the winding roller 3 below to achieve continuous production.

[0034] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of the present invention, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An extrusion device for film production, characterized in that: The device includes an adjustable mold (2), which includes an outer shell (4). The upper side of the outer shell (4) is provided with a feeding groove (5). The top of the feeding groove (5) is connected to the discharge port of the plastic extruder (1). A winding roller (3) is provided below the adjustable mold (2). The bottom end of the feeding groove (5) is connected to a discharge groove (6) provided on the lower side of the outer shell (4). The bottom of the outer shell (4) on both sides of the discharge groove (6) is rotatably connected to an adjustable side plate (8) by a hinge (7). A sealing film (9) is adhered to the inner wall of the discharge groove (6) and the adjustable side plate (8). An outer side plate (11) and an end plate (12) are also fixedly provided at the bottom of the outer shell (4). The front and rear ends of the adjustable side plate (8) are slidably connected to the side of the end plate (12). An adjustment component (10) is connected between the adjustable side plate (8) and the outer side plate (11).

2. The extrusion equipment for film production according to claim 1, characterized in that: The adjustment assembly (10) includes a connecting seat (101) and a fixed seat (105). The connecting seat (101) and the fixed seat (105) are respectively fixed on the adjustable side plate (8) and the outer side plate (11). A screw (102) is rotatably installed on the connecting seat (101). The screw (102) is threadedly connected to a connecting block (104). Pins that rotatably connect to the fixed seat (105) are fixed on both sides of the connecting block (104), and the axis of the pins is parallel to the axis of the hinge (7).

3. The extrusion equipment for film production according to claim 2, characterized in that: The connecting seat (101) has a U-shaped plate structure, and a limiting plate (103) is fixed on the screws (102) on both sides of the connecting seat (101).

4. The extrusion equipment for film production according to claim 1, characterized in that: The sealing membrane (9) is a polytetrafluoroethylene membrane structure, and the length of the sealing membrane (9) is the same as the length of the adjustable side plate (8). The sealing membrane (9) is installed on the outside of the hinge (7).

5. An extrusion apparatus for film production according to claim 1, characterized in that: The discharge trough (6) is a flat square trough structure, and the facing sides of the two end plates (12) are on the same plane as the inner wall of the discharge trough (6).

6. The extrusion equipment for film production according to claim 1, characterized in that: The number of adjustment components (10) installed on each of the adjustable side plates (8) is two, and the two adjustment components (10) are respectively located at both ends of the adjustable side plate (8).

Images