A film sealing mechanism applied to a film blowing machine and a film blowing machine applying the same

Abstract

The utility model discloses a film sealer mechanism and the film blowing machine of application thereof applied to film blowing machine relates to film production technical field, including frame, be provided with the cross bar on the frame, be provided with the sliding block on the cross bar slidably, and the clamping block is connected to the sliding block lower extreme, and the clamping block one side is provided with the seal knife, wherein, heating element is arranged in the clamping block, and the clamping block will heat transfer to the seal knife after being heated by heating element, still be provided with the backboard on the frame, and the backboard is opposite to the seal knife and is provided, and the film passes through between the backboard and the seal knife, the utility model discloses through setting up the seal knife to the film and carry out seal, make the upper and lower two layers of film hot melt bonding, and the space in the film is divided into two spaces, thereby satisfy the production demand of making the film bag with two chambers, can reduce production step, improve production efficiency, and cool the seal place after seal and form the shape fast, avoid hot melt bonding place and separate again and occur bonding when winding.

Description

Technical Field

[0001] This utility model relates to the field of film production technology, and in particular to a film hot-sealing mechanism for a blown film machine and a blown film machine using the same. Background Technology

[0002] A blown film machine is a device that heats and melts plastic particles and then blows them into a thin film. There are many types of blown film machines, including those for PE, POF, etc. These films, depending on their materials and properties, are widely used in various fields, suitable for high-end film packaging, plastic bags, protective films, etc. The process involves adding dry raw material particles into the machine barrel. A rotating beveled surface generates a thrust perpendicular to the beveled surface, propelling the plastic particles forward while they are heated and gradually melted. The molten plastic is filtered through the die head to remove impurities and then blown through the die to form a film bubble. After cooling by an air ring, and pressing by a herringbone plate and flattening rollers, the finished film is rolled into a cylinder by a winding mechanism.

[0003] Existing films, after being formed by a blown film machine, have a single cylindrical cavity inside. They can be further processed by a bag-cutting machine to be slit and heat-sealed to make bags that can hold items. However, when it is necessary to produce bags of different types, such as bags with two chambers, that is, bags with a dividing line in the middle that divides the internal space of the bag into two spaces, the existing blown film machines are lacking in this aspect and cannot meet the production needs. As a result, after the film is produced, workers still need to transfer it to a special workstation for further processing, which affects the production efficiency.

[0004] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the aforementioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a film hot-sealing mechanism for a blown film machine, comprising a frame, a crossbar on the frame, a sliding block slidably disposed on the crossbar, a clamping block connected to the lower end of the sliding block, and a hot-sealing knife disposed on one side of the clamping block, wherein a heating element is disposed inside the clamping block, and the clamping block transfers heat to the hot-sealing knife after being heated by the heating element; The frame is also equipped with a backing plate, which is positioned opposite to the heat sealing knife, and the film passes through the space between the backing plate and the heat sealing knife.

[0007] As a further embodiment of this utility model, it also includes a cold pressing block, which is located at the lower end of the hot sealing knife and connected to the sliding block. A cooling circuit is provided inside the cold pressing block, and a coolant delivery pipe is connected to the outside of the cooling circuit. The cold pressing block has a cold pressing protrusion on the side facing the plate.

[0008] As a further embodiment of this utility model: the cooling circuit has an inverted "U" shaped structure, and an inlet and an outlet are formed at the lower end of the cold pressing block.

[0009] As a further embodiment of this utility model: the sliding block has a through hole, the sliding block is sleeved on the crossbar through the through hole, and the upper end of the sliding block also has a screw hole that connects to the through hole. A screw rod is screwed into the screw hole, and the upper end of the screw rod extends to the top of the sliding block and is connected to a knob.

[0010] As a further embodiment of this utility model: a connecting plate is fixedly connected to the lower end of the sliding block, and a fixing rod is provided at the upper end of the clamping block to be fixedly connected to the connecting plate, so that the clamping block is stably installed at the lower end of the sliding block.

[0011] As a further embodiment of this utility model: the clamping block has a clamping opening corresponding to the hot sealing knife. After the hot sealing knife is inserted into the clamping opening, one end protrudes out of the clamping block and faces the backing plate. The part of the hot sealing knife inserted into the clamping opening has a fixing hole. A hole through the clamping opening is opened on one side of the clamping block. A clamping post is screwed into the hole, and the clamping post passes through the fixing hole.

[0012] As a further embodiment of this utility model: the cold pressing block has an installation opening on the side away from the backing plate, an installation block is fixedly connected in the installation opening, and a second fixing rod is provided on the upper end of the installation block, and the upper end of the second fixing rod is fixedly connected to the connecting plate.

[0013] As a further embodiment of this utility model: the frame is provided with a guide rod located at the upper end of the back plate, and the frame is also provided with a steering roller assembly located at the lower end of the back plate.

[0014] This utility model also proposes a blown film machine, which includes the film hot-sealing mechanism described above for use in blown film machines.

[0015] Compared with the prior art, the beneficial effects of this technical solution are as follows: when the double-layer film passes between the back plate and the hot-sealing knife after being flattened, the hot-sealing knife always maintains pressure on the film. After being heated by the heating element, the knife surface reaches the temperature of melting the film, so that the hot-sealing knife heats and melts the film in contact with it, so that the upper and lower layers of the film are heat-fused and bonded to each other, and the cylindrical cavity inside the film is divided into two spaces. Then the film is wound into a tube by the winding mechanism, which can be directly fed into the bag making machine for bag making. After cutting and sealing, a film bag with two chambers can be formed. Next, the area where the film is hot-melted passes through a cold pressing block, while coolant enters the cooling circuit through a delivery pipe, lowering the temperature of the cold pressing block and the surface of the cold pressing bump. This allows the cold pressing bump to quickly cool the hot-melt bonded area of ​​the film, enabling rapid shaping and preventing the hot-melt bonded area from separating again due to the tension of the winding mechanism. It also prevents the film from sticking together after winding if the hot-melt area is not cooled properly.

[0016] In summary, this utility model uses a heat-sealing knife to heat-seal the film, bonding the upper and lower layers together and dividing the internal space of the film into two compartments. This meets the production requirements for making film bags with two chambers, reduces production steps, improves production efficiency, and allows for rapid cooling and shaping of the heat-sealed area after heat sealing. This prevents the heat-sealed area from separating again and from sticking during winding, thus improving the heat-sealing quality.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the clamping block of this utility model; Figure 4 This is a schematic diagram of the structure of the cold-pressed block of this utility model; Figure 5 This is a schematic diagram of the cooling circuit cross-sectional structure of the cold-pressed block of this utility model; The corresponding labels in the attached diagram are explained as follows: 1. Frame; 11. Backplate; 12. Guide rod; 13. Steering roller assembly; 2. Crossbar; 3. Sliding block; 31. Through hole; 32. Screw hole; 33. Screw; 34. Knob; 35. Connecting plate; 4. Clamping block; 41. Heating element; 42. Fixing rod one; 43. Clamping opening; 44. Hole position; 45. Clamping column; 5. Hot sealing knife; 51. Fixing hole; 6. Cold pressing block; 61. Cooling circuit; 611. Water inlet; 612. Water outlet; 62. Cold pressing protrusion; 63. Mounting port; 7. Mounting block; 71. Fixing rod two. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-5 A film heat sealing mechanism for a blown film machine includes a frame 1, a crossbar 2 on the frame 1, a sliding block 3 slidably mounted on the crossbar 2, a clamping block 4 connected to the lower end of the sliding block 3, and a heat sealing knife 5 on one side of the clamping block 4. A heating element 41 is installed inside the clamping block 4, and the clamping block 4 transfers heat to the heat sealing knife 5 after being heated by the heating element 41. The frame 1 is also provided with a backing plate 11, which is positioned opposite to the hot sealing knife 5, and the film passes through the space between the backing plate 11 and the hot sealing knife 5.

[0022] Specifically, after the film bubble blown by the blown film machine is rolled into a double-layer film by the flattening roller, it passes between the backing plate 11 and the hot sealing knife 5. The hot sealing knife 5 always maintains pressure on the film. The hot sealing knife 5 is heated by the heating element 41 due to the clamping block 4, which causes the temperature of the hot sealing knife 5 to rise through heat transfer, so that the blade surface reaches the temperature of melting film (for example, about 120~180℃ for PE film, depending on the material). This allows the hot sealing knife 5 to melt the film it contacts, so that the upper and lower layers of the film are thermally melted and bonded together. This divides the cylindrical cavity inside the film into two spaces. Then the film is wound into a tube by the winding mechanism, which can be directly fed into the bag making machine for bag making. After cutting and sealing, a film bag with two chambers can be formed. Preferably, the heating element 41 is a resistance wire, which can be heated by the passage of current, thereby heating the clamping block 4; In summary, this utility model uses a heat-sealing knife 5 to heat-seal the film, causing the upper and lower layers of the film to be thermally bonded together. This divides the internal space of the film into two spaces, thereby meeting the production requirements for making film bags with two chambers. This reduces production steps and improves production efficiency.

[0023] Based on the above embodiments, it is further proposed that a cold pressing block 6 is also included. The cold pressing block 6 is located at the lower end of the hot sealing knife 5 and is connected to the sliding block 3. A cooling circuit 61 is provided inside the cold pressing block 6. A coolant delivery pipe is connected to the outside of the cooling circuit 61. The cold pressing block 6 has a cold pressing protrusion 62 on the side facing the plate 11.

[0024] Specifically, after the film is heat-sealed by the hot-sealing knife 5, the area where the film was heat-sealed will then pass through the cold pressing block 6. The cold pressing protrusion 62 of the cold pressing block 6 will continuously press against the area where the film was heat-sealed. Meanwhile, coolant enters the cooling circuit 61 inside the cold pressing block 6 through the delivery pipe, which lowers the temperature of the surface of the cold pressing block 6 and the cold pressing protrusion 62. This allows the cold pressing protrusion 62 to quickly cool the area where the film was heat-sealed, thus quickly setting the film and preventing the heat-sealed area from separating again due to the tension of the winding mechanism. It also prevents the film from sticking together after winding if the area where the film was heat-sealed is not cooled properly.

[0025] Preferred, Reference Figure 5 The cooling circuit 61 has an inverted "U" shape, with an inlet 611 and an outlet 612 at the lower end of the cold press block 6. A delivery pipe is connected to the inlet 611 to allow coolant to enter the cooling circuit 61. After the coolant completes the inverted "U" shaped movement trajectory, it is discharged from the outlet 612. The outlet 612 is connected to a drain pipe, which splashes the coolant into a water tank. Then, the water pump injects the coolant in the water tank into the cooling circuit through the delivery pipe, thus forming a circulating cooling system and improving the cooling effect on the cold press block 6.

[0026] refer to Figure 2 Based on the above embodiments, it is further proposed that the sliding block 3 is provided with a through hole 31, the sliding block 3 is sleeved on the crossbar 2 through the through hole 31, and the upper end of the sliding block 3 is also provided with a screw hole 32 that is connected to the through hole 31. A screw rod 33 is screwed into the screw hole 32, and the upper end of the screw rod 33 extends to the top of the sliding block 3 and is connected to a knob 34.

[0027] Specifically, by rotating the knob 34, the screw 33 rotates within the screw hole 32, causing the screw 33 to move away from or press against the crossbar 2 in a straight line, thereby achieving the effect of fixing or unlocking the sliding block 3. This allows for flexible adjustment of the position of the sliding block 3 on the crossbar 2, which in turn adjusts the position of the hot-sealing knife 5 and the cold-pressing block 6 to hot-seal different positions of the film, adjusting the size ratio of the two chambers formed by the film, such as 3:7 or 4:6, thus meeting different production needs.

[0028] refer to Figure 2 Based on the above embodiments, it is further proposed that a connecting plate 35 is fixedly connected to the lower end of the sliding block 3, and a fixing rod 42 fixedly connected to the connecting plate 35 is provided on the upper end of the clamping block 4, so that the clamping block 4 is stably installed on the lower end of the sliding block 3.

[0029] refer to Figure 3 Preferably, the clamping block 4 has a clamping opening 43 corresponding to the hot-sealing knife 5. After the hot-sealing knife 5 is inserted into the clamping opening 43, one end protrudes out of the clamping block 4 and is opposite to the backing plate 11. The part of the hot-sealing knife 5 inserted into the clamping opening 43 has a fixing hole 51. A hole 44 penetrating the clamping opening 43 is opened on one side of the clamping block 4. A clamping post 45 is screwed into the hole 44 and the clamping post 45 penetrates the fixing hole 51.

[0030] Specifically, the hot-sealing knife 5 is embedded into the clamping opening 43, and then the clamping post 45 is rotated into the hole 44. After continuous rotation, the clamping post 45 passes through the fixing hole 51 on the hot-sealing knife 5 and exits from the other side of the clamping block 4, thereby fixing the hot-sealing knife 5 in the clamping opening 43 to prevent it from coming loose during use.

[0031] refer to Figure 4 Based on the above embodiments, it is further proposed that the cold pressing block 6 has an installation port 63 on the side away from the backing plate 11, and an installation block 7 is fixedly connected in the installation port 63. The upper end of the installation block 7 is provided with a fixing rod 71, and the upper end of the fixing rod 71 is fixedly connected to the connecting plate 35.

[0032] Specifically, the mounting block 7 is fixed to the connecting plate 35 by the fixing rod 71 and is located at the lower end of the clamping block 4. Then, one end of the mounting block 7 is fixed in the mounting port 63 of the cold pressing block 6, so that the cold pressing block 6 is stably fixed at the lower end of the hot sealing knife 5.

[0033] refer to Figure 1 Preferably, the frame 1 is provided with a guide rod 12 located at the upper end of the back plate 11, and the frame 1 is also provided with a turning roller group 13 located at the lower end of the back plate 11. The guide rod 12 guides the film to pass between the back plate 11 and the hot sealing knife 5. After the hot sealing is completed, the turning roller group 13 turns the film and it is wound into a tube by the winding mechanism of the blown film machine.

[0034] Based on the above-mentioned film hot-sealing mechanism applied to a blown film machine, this utility model also provides a blown film machine, which includes the film hot-sealing mechanism applied to the blown film machine according to any of the above-mentioned methods. During the blown film process, the film hot-sealing mechanism applied to the blown film machine is set at the hot-sealing station of the blown film machine. The film is hot-sealed by the hot-sealing knife 5 to form a double chamber. Then, after being cold-pressed, it is wound up.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A film heat sealing mechanism for use in a blown film machine, characterized in that, Includes a frame (1), on which a crossbar (2) is provided, and a sliding block (3) is slidably provided on the crossbar (2). A clamping block (4) is connected to the lower end of the sliding block (3). A hot sealing knife (5) is provided on one side of the clamping block (4). A heating element (41) is provided inside the clamping block (4). After the clamping block (4) is heated by the heating element (41), it transfers heat to the hot sealing knife (5). The frame (1) is also provided with a backing plate (11), which is arranged opposite to the hot sealing knife (5), and the film passes through the backing plate (11) and the hot sealing knife (5).

2. The film sealing mechanism for a blown film machine according to claim 1, characterized in that, It also includes a cold pressing block (6), which is located at the lower end of the hot sealing knife (5) and connected to the sliding block (3). A cooling circuit (61) is provided inside the cold pressing block (6), and a coolant delivery pipe is connected to the outside of the cooling circuit (61). The cold pressing block (6) has a cold pressing protrusion (62) on the side facing the back plate (11).

3. The film sealing mechanism for a blown film machine according to claim 2, characterized in that, The cooling circuit (61) has an inverted "U" shaped structure, and an inlet (611) and an outlet (612) are formed at the lower end of the cold press block (6).

4. The film sealing mechanism for a blown film machine according to claim 3, characterized in that, The sliding block (3) has a through hole (31) and the sliding block (3) is sleeved on the crossbar (2) through the through hole (31). The upper end of the sliding block (3) also has a screw hole (32) that connects to the through hole (31). A screw rod (33) is screwed into the screw hole (32). The upper end of the screw rod (33) extends to the top of the sliding block (3) and is connected to a knob (34).

5. The film sealing mechanism for a blown film machine according to claim 4, characterized in that, The lower end of the sliding block (3) is fixedly connected to a connecting plate (35), and the upper end of the clamping block (4) is provided with a fixing rod (42) fixedly connected to the connecting plate (35) so that the clamping block (4) is stably installed at the lower end of the sliding block (3).

6. The film sealing mechanism for a blown film machine according to claim 5, characterized in that, The clamping block (4) has a clamping opening (43) corresponding to the hot sealing knife (5). After the hot sealing knife (5) is inserted into the clamping opening (43), one end protrudes out of the clamping block (4) and is opposite to the backing plate (11). The part of the hot sealing knife (5) inserted into the clamping opening (43) has a fixing hole (51). The clamping block (4) has a hole (44) through the clamping opening (43) on one side. A clamping post (45) is screwed into the hole (44) and the clamping post (45) passes through the fixing hole (51).

7. The film sealing mechanism for a blown film machine according to claim 4, characterized in that, The cold pressing block (6) has an installation port (63) on the side away from the backing plate (11). An installation block (7) is fixedly connected in the installation port (63). A fixing rod (71) is provided at the upper end of the installation block (7). The upper end of the fixing rod (71) is fixedly connected to the connecting plate (35).

8. The film sealing mechanism for a blown film machine according to any one of claims 1-7, characterized in that, The frame (1) is provided with a guide rod (12) located at the upper end of the back plate (11), and the frame (1) is also provided with a steering roller assembly (13) located at the lower end of the back plate (11).

9. A blown film machine, characterized in that, Includes a film heat sealing mechanism for use in a blown film machine as described in any one of claims 1-8.

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