Vacuum skin film extrusion device for food

Abstract

The invention discloses a vacuum skin film extrusion device for food, and relates to the field of vacuum skin film preparation, the vacuum skin film extrusion device comprises an extrusion die head and an electric heating sheet arranged outside the extrusion die head, the extrusion die head is provided with a fluid interface, and the interior of the extrusion die head is sequentially provided with a flow inlet cavity and an extrusion cavity from top to bottom; a sealing base is slidably connected into the inflow cavity, and the inflow cavity is divided into a connecting part and a filling part through the sealing base. According to the vacuum skin film extrusion device for food, through mutual cooperation of a sealing base, a connecting part, a filling part, a connecting section, a slowly changing section, an extrusion section and an auxiliary discharging unit, air in an extrusion die head can be effectively discharged in the initial extrusion forming process of a skin film, so that the amount of air containing impurities in the initially extruded skin film is small, and the quality of the skin film is improved. Therefore, the waste of materials can be effectively reduced, and the extrusion molding work of the skin film can enter a stable state more quickly.

Description

Technical Field

[0001] The invention relates to a vacuum body-conforming film preparation technology, and in particular to a vacuum body-conforming film extrusion device for food. Background Art

[0002] Vacuum laminating film is a film material commonly used in food packaging. It can be tightly adhered to the surface of food with the help of a vacuum laminating machine, thereby playing a good role in preserving and protecting the food.

[0003] During the production of vacuum body-fitting film, the hot-melt plastic fluid is squeezed out from the die head through an extrusion device to form the initial shape of the film. It is then further stretched through stretching-related components to further enhance its mechanical properties. It is then cooled and wound to obtain the finished body-fitting film.

[0004] However, in actual use of existing equipment, when the body-fitting film is initially extruded from the die head, a large amount of air remains inside it. After the molten plastic fluid enters the die head, it will actively flow downward under the action of its own weight, and before it is completely filled with plastic fluid, a large amount of air will continue to exist inside it. Therefore, in the initial state, exhaust needs to be continued for a period of time. For example, the utility model patent with announcement number CN220995394U discloses a vacuum body-fitting film extrusion device for food. The die head structure disclosed therein also needs to be exhausted during extrusion so that the molten plastic fluid can fill the internal cavity of the die head, and then the body-fitting film can be evenly extruded. During the initial exhaust process, some of the molten plastic fluid will be discharged, which will cause a waste of resources. Summary of the Invention

[0005] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a vacuum body-conforming film extrusion device for food.

[0006] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a vacuum body-conforming film extrusion device for food, comprising an extrusion die and an electric heating plate arranged on the outside of the extrusion die, the extrusion die being provided with a fluid interface, the interior of the extrusion die being provided with an inlet cavity and an extrusion cavity from top to bottom, the interior of the inlet cavity being slidably connected to a sealing seat, the inlet cavity being separated by the sealing seat to form a connecting portion and a filling portion, an auxiliary unloading unit being provided on the sealing seat, and the auxiliary unloading unit being used for auxiliary exhaust during initial extrusion.

[0007] Furthermore, the width of the inlet cavity is greater than the width of the extrusion cavity.

[0008] Furthermore, the auxiliary unloading unit includes guide grooves symmetrically opened on both sides of the inner wall of the inlet cavity, guide blocks are symmetrically fixedly installed at both ends of the sealing seat, the guide blocks are slidingly connected to the inner side surfaces of the guide grooves, the surface of the sealing seat is provided with a through groove connecting the connecting part and the filling part, and receiving grooves connecting the through grooves are symmetrically opened on both sides of the inner wall of the sealing seat, and the inner wall of the receiving groove is equidistantly installed with multiple groups of first springs along its length direction, and the ends of all the first springs on the same side are fixedly connected to the same sealing baffle, and the surfaces of the two groups of the sealing baffles are provided with connected inclined portions, and the ends of the two groups of inclined portions close to each other are inclined downward.

[0009] Furthermore, the upper and lower ends of the guide groove are provided with extension grooves connected thereto, and the upper and lower ends of the guide block are fixedly installed with sealing plates, which are slidingly connected to the inner side surfaces of the extension groove, and a second spring is fixedly connected between the upper and lower sealing plates and the corresponding inner walls of the extension groove.

[0010] Furthermore, the size of the sealing plate is adapted to the guide groove.

[0011] Furthermore, the elastic coefficient of the first spring is greater than the elastic coefficient of the second spring. When the molten plastic is filled inside the connecting part to extrude the sealing seat, the sealing seat first overcomes the deformation force of the second spring and moves. When the sealing seat moves to the end of the filling part, the two sealing plates overcome the deformation force of the first spring and move away from each other.

[0012] Furthermore, the extrusion cavity includes a connecting section, a gradual change section and an extrusion section arranged in sequence from top to bottom, the width value of the connecting section is greater than the width value of the extrusion section, the width value of the connecting section is adapted to the through groove, and the width value of the gradual change section gradually decreases from the connecting section to the extrusion section.

[0013] Furthermore, both sides of the extrusion die head are provided with operating ports connected to the guide groove, the operating ports are provided with door grooves, the inner wall of the door groove is provided with sealing doors, the sealing door surface and the inner wall of the door groove are provided with locking screw grooves, and the internal threads of the locking screw grooves are connected with locking bolts.

[0014] Furthermore, an accommodating cavity is provided at the end of the guide block, a wire groove is provided between the accommodating groove and the accommodating cavity, a traction wire is fixedly connected to the surface of the sealing plate, the traction wires on both sides pass through the wire grooves on both sides and extend into the accommodating cavity, and the traction wires on both sides are connected by knotting the ends.

[0015] Furthermore, a hanging rod is installed on the inner wall of the accommodating cavity, and the position of the hanging rod corresponds to the traction line.

[0016] Compared with the prior art, the food vacuum body-conforming film extrusion device provided by the present invention has the following beneficial effects: 1. The vacuum body-fitting film extrusion device for food, through the mutual cooperation among the sealing seat, connecting part, filling part, connecting section, slow-changing section, extrusion section and auxiliary unloading unit, can effectively discharge the air inside the extrusion die head during the initial extrusion molding process of the body-fitting film, so that the amount of impure air in the initially extruded body-fitting film is small, thereby effectively reducing material waste and allowing the body-fitting film extrusion molding work to enter a stable state more quickly.

[0017] 2. The vacuum body-contact film extrusion device for food can continuously close the guide groove during the movement of the sealing seat through the mutual cooperation between the extension groove, the sealing plate, and the second spring, so that the connecting part and the filling part of the inlet cavity are always in a separated state, thereby ensuring that after the molten plastic fluid enters the connecting part, its continued feeding can push the sealing seat to expel the air in the filling part.

[0018] 3. The vacuum body-fitting film extrusion device for food can open the through slot when cleaning the solidified plastic blocks remaining inside the extrusion die head through the cooperation between the operating port, the traction line and the hanging rod, thereby ensuring the smooth cleaning of the residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the longitudinal cross-sectional structure of the extrusion die head of the present invention; Figure 3 for Figure 2 A in the middle is an enlarged structural diagram; Figure 4 It is a schematic diagram of a partial cross-sectional structure of the extrusion die head of the present invention; Figure 5 It is a schematic diagram of the partial cross-sectional structure of the extrusion die head and the sealing seat of the present invention; Figure 6 This is a structural schematic diagram of the sealing door and the extrusion die head in a separated state according to the present invention; Figure 7 for Figure 6 The enlarged structural diagram at B in the middle; Figure 8 It is a schematic diagram of the partial cross-section structure of the sealing seat and the guide block (including the traction line) of the present invention; Figure 9This is a schematic diagram of the partial cross-section (excluding the traction line) of the sealing seat and guide block of the present invention.

[0021] Description of reference numerals: 1. Extrusion die; 101. Electric heating plate; 102. Fluid interface; 2. Inlet cavity; 201. Connecting part; 202. Filling part; 21. Extrusion cavity; 211. Connecting section; 212. Slow-changing section; 213. Extrusion section; 22. Sealing seat; 3. Guide groove; 31. Guide block; 32. Through groove; 33. Accommodating groove; 34. First spring; 35. Sealing plate; 36. Inclined part; 37. Extension groove; 38. Sealing plate; 39. Second spring; 4. Operating port; 41. Door groove; 42. Sealing door; 43. Locking screw groove; 44. Locking bolt; 45. Accommodating cavity; 46. Wire trough; 47. Pull line; 48. Hanging rod. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0023] Example 1: Please refer to Figure 1-Figure 5 The vacuum body-conforming film extrusion device for food includes an extrusion die 1 and an electric heating plate 101 arranged outside the extrusion die 1. The extrusion die 1 is provided with a fluid interface 102. The interior of the extrusion die 1 is provided with an inlet cavity 2 and an extrusion cavity 21 from top to bottom. The interior of the inlet cavity 2 is slidably connected to a sealing seat 22. The inlet cavity 2 is separated by the sealing seat 22 to form a connecting portion 201 and a filling portion 202. The sealing seat 22 is provided with an auxiliary unloading unit, which is used for auxiliary exhaust during initial extrusion.

[0024] It should be noted that the width of the inlet cavity 2 is greater than the width of the extrusion cavity 21, so that after the molten plastic inside the inlet cavity 2 enters the extrusion cavity 21, it can fill the interior more quickly, thereby more efficiently discharging the air inside it.

[0025] The auxiliary unloading unit includes a guide groove 3 symmetrically opened on both sides of the inner wall of the inlet chamber 2, and guide blocks 31 are symmetrically fixedly installed at both ends of the sealing seat 22. The guide blocks 31 are slidably connected to the inner side surfaces of the guide groove 3. A through groove 32 connecting the connecting portion 201 and the filling portion 202 is opened on the surface of the sealing seat 22, and a receiving groove 33 connecting the through groove 32 is symmetrically opened on both sides of the inner wall of the sealing seat 22. A plurality of groups of first springs 34 are equidistantly installed on the inner wall of the receiving groove 33 along its length direction. The ends of all the first springs 34 on the same side are fixedly connected to the same sealing baffle 35. The surfaces of the two groups of sealing baffles 35 are provided with connected inclined portions 36. The ends of the two groups of inclined portions 36 that are close to each other are inclined downward, so that when the inclined portion 36 is subjected to thrust, it can exert a horizontal movement component force on the sealing baffle 35 as a whole, thereby driving the sealing baffles 35 on both sides to move away from each other.

[0026] It should be noted that the height of the connecting portion 201 is much smaller than the height of the filling portion 202, and in the non-working state, the sealing seat 22 is located at the junction of the connecting portion 201 and the filling portion 202, so that the actual internal space of the connecting portion 201 is smaller and there is less air inside it.

[0027] It should be added that an extension groove 37 connected to the guide groove 3 is provided at both the upper and lower ends, and a sealing plate 38 is fixedly installed at both the upper and lower ends of the guide block 31. The sealing plate 38 is slidably connected to the inner side surface of the extension groove 37, and a second spring 39 is fixedly connected between the upper and lower sealing plates 38 and the corresponding inner walls of the extension groove 37.

[0028] Moreover, the size of the sealing plate 38 is adapted to the guide groove 3, so that the sealing plate 38 can better seal the guide groove 3, so that the molten plastic will not enter the interior thereof, thereby keeping the connecting portion 201 and the filling portion 202 in a separated state at all times, so that when the connecting portion 201 is filled with molten plastic, it can push the sealing seat 22 to slide along the inner wall of the filling portion 202.

[0029] It should be further explained that the elastic coefficient of the first spring 34 is greater than the elastic coefficient of the second spring 39. When the molten plastic is filled inside the connecting part 201 to squeeze the sealing seat 22, the sealing seat 22 first overcomes the deformation force of the second spring 39 and moves, and when the sealing seat 22 moves to the end of the filling part 202, the two sealing plates 35 overcome the deformation force of the first spring 34 and move away from each other.

[0030] In this embodiment, the extrusion cavity 21 includes a connecting section 211, a gradually changing section 212 and an extrusion section 213 arranged in sequence from top to bottom. The width value of the connecting section 211 is greater than the width value of the extrusion section 213. The width value of the connecting section 211 is adapted to the through groove 32. The width value of the gradually changing section 212 gradually decreases from the connecting section 211 to the extrusion section 213, so that after the molten plastic fluid enters, it can be filled in sequence faster, so that the air inside the connecting section 211, the gradually changing section 212 and the extrusion section 213 can be discharged faster.

[0031] When the molten plastic fluid enters the connection portion 201 of the inlet chamber 2 through the fluid interface 102, it accumulates inside the connection portion 201. As the molten plastic fluid is continuously delivered, the internal hydraulic pressure gradually increases. Driven by this larger hydraulic pressure, the sealing seat 22 moves downward, and during the movement, it squeezes the air inside the filling portion 202, allowing it to be discharged through the bottom extrusion cavity 21. When the sealing seat 22 moves to the bottom end of the filling part 202, it cannot move further. At this time, as the hydraulic pressure continues to increase, it will push the inclined portion 36 on the sealing plate 35, so that the sealing plates 35 on both sides overcome the deformation force of the second spring 39 and move away from each other, thereby opening the through groove 32. At this time, the plastic fluid in the filling part 202 enters the connecting section 211 through the through groove 32, and passes through the gradual change section 212 into the extrusion section 213, and is finally squeezed out from the extrusion section 213 to form the initial state of the body-fitting film.

[0032] When the sealing seat 22 moves, it drives the guide blocks 31 at both ends to move. When the guide blocks 31 move, they drive the sealing plates 38 provided at the upper and lower ends to move synchronously, so that the guide groove 3 can be sealed more effectively.

[0033] Example 2: Please refer to Figure 6-Figure 9 , this embodiment provides a technical solution based on the above embodiment: operation ports 4 connected to the guide groove 3 are provided on both sides of the extrusion die head 1, and a door groove 41 is provided at the operation port 4. The inner wall of the door groove 41 is provided with a sealing door 42, and the surface of the sealing door 42 and the inner wall of the door groove 41 are provided with a locking screw groove 43. The internal thread of the locking screw groove 43 is connected with a locking bolt 44, and an accommodating cavity 45 is provided at the end of the guide block 31. A wire groove 46 is provided between the accommodating groove 33 and the accommodating cavity 45. A traction line 47 is fixedly connected to the surface of the sealing baffle 35, and the traction lines 47 on both sides respectively pass through the wire grooves 46 on both sides and extend into the accommodating cavity 45. The traction lines 47 on both sides are connected by knotting at the ends.

[0034] In addition, a hanging rod 48 is installed on the inner wall of the accommodating cavity 45 , and the position of the hanging rod 48 corresponds to the pulling line 47 .

[0035] It should be noted that the traction line 47 is made of a high-temperature resistant and high-strength material.

[0036] When it is necessary to remove the plastic blocks remaining inside the extrusion die 1 in the later stage, the extrusion die 1 is heated by the electric heating plate 101 so that the residual plastic after solidification inside can be melted again, and the sealing door 42 can be loosened by turning the locking bolt 44, and the sealing door 42 can be removed. After that, the operator pulls the traction lines 47 on both sides, so that under the traction of the traction lines 47, the sealing plates 35 on both sides can overcome the deformation force of the second spring 39 and move their positions, thereby opening the through slot 32. After that, the operator hangs the pulled traction lines 47 on the hanging rod 48, so that the through slot 32 is always in an open state. At this time, under high-temperature heating, the melted plastic inside the extrusion die 1 can be discharged from its bottom end under the action of its own weight.

[0037] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A vacuum body-conforming film extrusion device for food, comprising an extrusion die (1) and an electric heater (101) arranged outside the extrusion die (1), wherein a fluid interface (102) is provided on the extrusion die (1), characterized in that: The interior of the extrusion die head (1) is provided with an inlet cavity (2) and an extrusion cavity (21) in sequence from top to bottom. The interior of the inlet cavity (2) is slidably connected to a sealing seat (22). The inlet cavity (2) is separated by the sealing seat (22) to form a connecting portion (201) and a filling portion (202). An auxiliary blanking unit is provided on the sealing seat (22), and the auxiliary blanking unit is used for auxiliary exhaust during initial extrusion.

2. The vacuum body-conforming film extrusion device for food according to claim 1, characterized in that: The width of the inlet cavity (2) is greater than the width of the extrusion cavity (21).

3. The food vacuum body-conforming film extrusion device according to claim 2, characterized in that: The auxiliary unloading unit includes guide grooves (3) symmetrically provided on both sides of the inner wall of the inlet cavity (2), guide blocks (31) are symmetrically fixedly installed at both ends of the sealing seat (22), and the guide blocks (31) are slidably connected to the inner side surfaces of the guide grooves (3). A through groove (32) connecting the connecting portion (201) and the filling portion (202) is provided on the surface of the sealing seat (22), and a receiving groove (33) connecting the through groove (32) is symmetrically provided on both sides of the inner wall of the sealing seat (22). The inner wall of the receiving groove (33) is equidistantly provided with multiple groups of first springs (34) along its length direction, and the ends of all the first springs (34) on the same side are fixedly connected to the same sealing baffle (35), and the surfaces of the two groups of the sealing baffles (35) are provided with connected inclined portions (36), and the ends of the two groups of the inclined portions (36) close to each other are inclined downward.

4. The food vacuum body-conforming film extrusion device according to claim 3, characterized in that: The guide groove (3) is provided with an extension groove (37) communicating therewith at both the upper and lower ends. The guide block (31) is fixedly mounted with a sealing plate (38) at both the upper and lower ends. The sealing plate (38) is slidably connected to the inner side surface of the extension groove (37), and a second spring (39) is fixedly connected between the upper and lower sealing plates (38) and the inner wall of the corresponding extension groove (37).

5. The vacuum body-conforming film extrusion device for food according to claim 4, characterized in that: The size of the sealing plate (38) is adapted to the guide groove (3).

6. The food vacuum body-conforming film extrusion device according to claim 5, characterized in that: The elastic coefficient of the first spring (34) is greater than the elastic coefficient of the second spring (39). When the connection portion (201) is filled with molten plastic to squeeze the sealing seat (22), the sealing seat (22) first overcomes the deformation force of the second spring (39) and moves. When the sealing seat (22) moves to the end of the filling portion (202), the two sealing plates (35) overcome the deformation force of the first spring (34) and move away from each other.

7. The vacuum body-conforming film extrusion device for food according to claim 6, characterized in that: The extrusion cavity (21) comprises a connecting section (211), a gradual change section (212), and an extrusion section (213) arranged in sequence from top to bottom. The width of the connecting section (211) is greater than the width of the extrusion section (213). The width of the connecting section (211) is adapted to the through groove (32). The width of the gradual change section (212) gradually decreases from the connecting section (211) to the extrusion section (213).

8. The vacuum body-conforming film extrusion device for food according to claim 7, characterized in that: Both sides of the extrusion die head (1) are provided with an operating port (4) connected to the guide groove (3), the operating port (4) is provided with a door groove (41), the inner wall of the door groove (41) is provided with a sealing door (42), the surface of the sealing door (42) and the inner wall of the door groove (41) are provided with a locking screw groove (43), and the internal thread of the locking screw groove (43) is connected to a locking bolt (44).

9. The vacuum body-conforming film extrusion device for food according to claim 8, characterized in that: An accommodating cavity (45) is provided at the end of the guide block (31), a wire groove (46) is provided between the accommodating groove (33) and the accommodating cavity (45), a traction wire (47) is fixedly connected to the surface of the blocking plate (35), the traction wires (47) on both sides respectively pass through the wire grooves (46) on both sides and extend into the accommodating cavity (45), and the traction wires (47) on both sides are connected by knotting the ends.

10. The vacuum body-conforming film extrusion device for food according to claim 9, characterized in that: A hanging rod (48) is installed on the inner wall of the accommodating cavity (45), and the position of the hanging rod (48) corresponds to the pulling line (47).

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