Child lock zipper heat sealing device

Abstract

The application discloses a child lock zipper heat sealing device for heat sealing a zipper and a plastic film, which comprises an upper ironing cutter, a lower ironing cutter and a zipper template, the zipper template comprises a film abutting part and a heat sealing matching part, the zipper template oppositely has two heat sealing matching parts, and the film abutting part is thicker than the heat sealing matching part; the upper ironing cutter and the lower ironing cutter respectively have two bosses, the bosses are matched with the heat sealing matching parts, the parts needing heat sealing between the zipper and the plastic film are pressed on the heat sealing matching parts, one of the four bosses is a cooling platform, the cooling platform is internally provided with a cooling channel and is isolated from other parts of the upper ironing cutter or the lower ironing cutter through a heat insulation layer, and cooling liquid flows in the cooling channel. The cooling platform abuts against positions of the zipper and the plastic film not needing heat sealing to prevent wrinkles, and the isolation of the heat insulation layer makes the functions of the cooling platform and the bosses not interfere with each other.

Description

Technical Field

[0001] This invention belongs to the field of plastic film processing equipment, and particularly relates to a heat sealing device for child lock zippers. Background Technology

[0002] Nowadays, there is a type of child lock with a plastic zipper closure, such as... Figure 1 As shown, the shaded area represents the area where the zipper and plastic bag are heat-sealed. However, on one side, the zipper is only heat-sealed at the bottom. This means that if you pull the plastic bag directly to open the zipper in this design, the force point is located at point A, which prevents the zipper from opening normally. To open the zipper, you need to hold the plastic bag opening (24) with one hand and the raised end (25) with the other hand to shift the force point to point B. This child-lock plastic zipper effectively prevents children from opening the plastic bag and accidentally swallowing the contents.

[0003] Due to the unique structure of these child-lock plastic zippers, special handling is required when heat-sealing the zipper and the plastic bag. A common method is to process zippers with inconsistent heat-sealing areas on the plastic bag in two separate stations: one side is heat-sealed normally, while the other side only has its bottom heat-sealed. However, this method has two significant drawbacks. First, since the zippers on both sides need to work together to seal the plastic bag, they must be at the same horizontal level on the bag. Separating them into two stations makes it difficult to precisely ensure that both zippers are at the same height. Second, normally, when heat-sealing a zipper to a plastic bag, both the top and bottom of the zipper need to be held in place by the heat sealer. However, when heat-sealing only the bottom of the zipper, uneven pressure causes wrinkles in the finished product. To eliminate wrinkles, the bottom of the zipper not being heat-sealed must also be held in place, such as... Figure 2 As shown, a heat insulation block is used to hold the bottom of the zipper in place. However, because the heat insulation block is close to the heating element, it will still heat up after a long period of use, causing the bottom of the zipper to stick to the plastic bag.

[0004] Therefore, there is a need for a child lock zipper heat sealing device that can simultaneously process both sides of the zipper, control the temperature of the part that is in contact with the part of the zipper that does not need to be heat sealed, and does not affect the heat sealing temperature of other parts of the hair perm. Summary of the Invention

[0005] The purpose of this invention is to provide a heat-sealing device for child lock zippers, solving the problems of inaccurately ensuring both sides of the zipper are at the same height when heat-sealing at two stations, and the wrinkling phenomenon that occurs in the finished product due to uneven force when heat-sealing only the bottom side of the zipper. To eliminate wrinkles, the bottom of the zipper that is not to be heat-sealed must also be supported, such as... Figure 2As shown, a heat insulation block is used to hold the bottom of the zipper in place. However, because the heat insulation block is close to the heating element, it will still heat up after prolonged use, causing the bottom of the zipper to stick to the plastic bag.

[0006] To achieve the above objectives, the specific technical solution of the present invention is as follows:

[0007] A heat-sealing device for a child lock zipper is used to heat-seal a zipper and a plastic film. It includes an upper heat-sealing blade, a lower heat-sealing blade, and a zipper template. The zipper template is installed between the upper heat-sealing blade and the lower heat-sealing blade. The zipper template includes a film-holding part and a heat-sealing mating part. Two zipper molds are arranged opposite each other with the heat-sealing mating part. The thickness of the film-holding part is greater than that of the heat-sealing mating part, thereby forming a space that can accommodate the zipper.

[0008] The zipper is divided into an upper zipper and a lower zipper. The upper zipper and the lower zipper are engaged and locked together. The heat-sealed mating part is inserted between the upper zipper and the lower zipper to hold the zipper in place.

[0009] The upper and lower heat sealing blades each have two protrusions, which mate with the heat-sealing mating part to press the portion of the zipper and plastic film that needs to be heat-sealed onto the heat-sealing mating part. One of the protrusions is a cooling platform with a cooling channel inside. The cooling platform is isolated from other parts of the upper or lower heat sealing blade by a heat insulation layer, and coolant flows through the cooling channel. This design allows for heat sealing of the upper and lower zippers and plastic film at a single workstation with precise positioning. The protrusions on the upper and lower heat sealing blades, excluding the cooling platform, are used for heat sealing the zipper and plastic film. The cooling platform, with its heat insulation layer, insulates the heat from the upper or lower heat sealing blade. The cooling platform also has a cooling channel inside, through which coolant continuously flows. Even if the heat insulation layer's effectiveness decreases due to prolonged use, heat is transferred to the cooling platform through the heat insulation layer, and the coolant quickly cools the cooling platform, preventing the zipper and plastic film from sticking together where heat sealing is not required.

[0010] Furthermore, the cooling platform is mounted on the lower heating blade. The cooling platform, the heat insulation layer, and the lower heating blade are sequentially exposed on the same side with a first step, a second step, and a third step. The second step has several hexagonal set bolts that penetrate the second step and are partially screwed into the first step. Similarly, the third step has several hexagonal set bolts that penetrate the third step and are partially screwed into the second step. With this design, the first step is on the cooling platform, the second step is on the heat insulation layer, and the third step is on the lower heating blade. The first and second steps fix the heat insulation layer to the cooling platform, and the second and third steps fix the lower heating blade to the heat insulation layer. This ensures that there are no other parts of the cooling platform and the lower heating blade in direct contact, preventing the high temperature on the lower heating blade from being transferred to the cooling platform through any direct medium, effectively preventing the cooling platform from rapidly increasing in temperature.

[0011] Furthermore, an electric heating plate is fixedly attached to one end of each of the upper and lower heating blades away from the zipper template. The electric heating plate serves as a heat source, heating the upper and lower heating blades.

[0012] Furthermore, both the upper and lower heating blades, except for the insulation layer, are made of metal materials with good thermal conductivity. This design allows the heating plate to heat the upper and lower heating blades more efficiently, and the temperature control of the upper and lower heating blades is more sensitive.

[0013] Furthermore, the insulation layer is made of glass fiber. This design, due to its manufacturing process, allows glass fiber to minimize heat transfer.

[0014] Furthermore, the film holding part of the zipper template is provided with two cooling holes, through which coolant flows. The film holding part and the heat-sealing mating part are integrally formed. The more important function of providing cooling holes to the film holding part is to cool down the heat-sealing mating part. The heat-sealing mating part is partially inserted between the upper and lower zippers to prevent the upper and lower zippers from sticking together during the heat-sealing process. However, under prolonged operation, the heat from the upper and lower heat-sealing blades will be transferred to the heat-sealing mating part. If the heat-sealing mating part is not cooled down, the excessive temperature of the heat-sealing mating part will damage the zipper and cause wrinkles.

[0015] Furthermore, both the cooling channels of the cooling platform and the cooling holes of the zipper template are fixedly connected with anti-detachment heads. These anti-detachment heads consist of multiple tapered tube heads arranged sequentially, with the tapered surfaces of the tube heads facing away from the cooling holes or cooling channels. Through this design, the main function of the anti-detachment heads is to connect the cooling holes and cooling channels to external refrigeration equipment, allowing the coolant within the cooling holes and channels to circulate continuously. The anti-detachment design of the tapered tube heads greatly prevents the pipes from falling off after being connected to the anti-detachment heads.

[0016] Furthermore, an insulation plate is provided at the end of the heating plate away from the upper or lower heating blade. This insulation plate is designed primarily to prevent ineffective heat transfer, save energy, and also serve as a protective barrier.

[0017] Furthermore, a cooling plate is installed behind the upper and lower heat-sealing blades along the feeding direction of the zipper and plastic film. This cooling plate is used to cool the heat-sealed plastic film and zipper. This design ensures that the zipper and plastic film are cooled promptly after heat sealing, preventing wrinkles.

[0018] Furthermore, the cooling plate is equipped with a pipe joint, which is used to connect the cooling path inside the cooling plate to an external refrigeration device. The double heat transfer path is to ensure the heat transfer of the plastic film and zipper is completed and to prevent them from falling off.

[0019] The beneficial effects of this invention are as follows: it can heat seal the upper and lower zippers and plastic film in one workstation with precise positioning. The protrusions of the upper and lower heat sealing blades, except for the cooling table, are used for heat sealing the zipper and plastic film. The cooling table is insulated from the heat of the upper or lower heat sealing blades by a heat insulation layer. The cooling table is also provided with cooling holes, through which coolant continuously flows. Even if the heat insulation layer loses its heat insulation effect due to long-term use, the heat is transferred to the cooling table through the heat insulation layer. The coolant can also quickly cool down the cooling table, preventing the zipper and plastic film from sticking together in areas where heat sealing is not required. Attached Figure Description

[0020] Figure 1 This is a reference diagram for stress analysis of zippers and plastic bags in the background art of this invention;

[0021] Figure 2 The following is a reference diagram showing the structure of the iron head and the heat insulation block in the background art of this invention;

[0022] Figure 3 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 4 for Figure 3 A magnified structural diagram of part A in the diagram;

[0024] Figure 5 This is a schematic diagram of the front structure of the present invention;

[0025] Figure 6 for Figure 5 Enlarged schematic diagram of part B of the structure;

[0026] Figure 7 This is a schematic diagram of the structure of the lower heating knife (cooling channel to prevent detachment) and its auxiliary components of the present invention;

[0027] Figure 8 This is a schematic diagram of the zipper template structure of the present invention;

[0028] Figure 9 This is a schematic diagram of the anti-slip head structure of the present invention;

[0029] Figure 10 for Figure 7 A magnified structural diagram of part C in the diagram;

[0030] The markings in the diagram are as follows: 1. Upper heat-sealing blade; 2. Lower heat-sealing blade; 3. Zipper template; 4. Film holding part; 5. Heat-sealing mating part; 6. Upper zipper; 7. Lower zipper; 8. Plastic film; 9. Boss; 10. Cooling platform; 11. Heat insulation layer; 12. Cooling hole; 13. First step surface; 14. Second step surface; 15. Third step surface; 16. Hex socket head cap screw; 17. Heating plate; 18. Anti-detachment head; 19. Conical tube head; 20. Cooling plate; 21. Pipe joint; 22. Heat insulation plate; 23. Cooling channel; 24. Plastic bag opening; 25. Upturned end. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0032] like Figures 3 to 10 As shown:

[0033] Example 1

[0034] A heat-sealing device for a child lock zipper is used to heat-seal a zipper and a plastic film 8. It includes an upper heat-sealing blade 1, a lower heat-sealing blade 2, and a zipper template 3. The zipper template 3 is installed between the upper heat-sealing blade 1 and the lower heat-sealing blade 2. The zipper template 3 includes a film-holding part 4 and a heat-sealing mating part 5. Two zipper templates 3 are arranged with the heat-sealing mating parts 5 facing each other. The thickness of the film-holding part 4 is greater than that of the heat-sealing mating part 5, thereby forming a space that can accommodate the zipper.

[0035] The zipper is divided into an upper zipper 6 and a lower zipper 7. The upper zipper 6 and the lower zipper 7 are engaged and snapped together. The heat-sealing part 5 is inserted between the upper zipper 6 and the lower zipper 7 to hold the zipper in place.

[0036] The upper heatsink 1 and the lower heatsink 2 each have two protrusions 9. The protrusions 9 cooperate with the heat-sealing mating part 5 to press the part between the zipper and the plastic film 8 that needs to be heat-sealed onto the heat-sealing mating part 5. One of the protrusions 9 of the upper heatsink 1 or the lower heatsink 2 is a cooling platform 10. A cooling channel 23 is formed inside the cooling platform 10. The cooling platform 10 is isolated from other parts of the upper heatsink 1 or the lower heatsink 2 by a heat insulation layer 11. Cooling liquid flows in the cooling channel 23.

[0037] The above embodiment is implemented as follows: a layer of plastic film 8 is provided above and below the film supporting part 4; the upper zipper 6 and the lower zipper 7 of the zipper are snapped together and pre-placed in the space formed by the height difference between the heat-sealing mating part 5 and the film supporting part 4; the heat-sealing mating part 5 is partially inserted between the upper zipper 6 and the lower zipper 7; the protrusions 9 of the upper heat-sealing blade 1 and the lower heat-sealing blade 2, except for the cooling table 10, are used to heat-seal the zipper and the plastic film 8; and the cooling table 10 isolates the heat of the upper heat-sealing blade 1 or the lower heat-sealing blade 2 through the heat insulation layer 11. The cooling platform 10 has cooling holes 12 inside, through which coolant continuously flows. Even if the heat insulation layer 11 loses its heat insulation effect due to long-term use, heat is transferred to the cooling platform 10 through the heat insulation layer 11. The coolant can also quickly cool down the cooling platform 10. This means that, originally, four positions between the upper zipper 6 and the lower zipper 7 and the plastic film 8 would be heat-sealed, but because the cooling platform 10 is present, one part is not heat-sealed, thus achieving the child lock function in the background art.

[0038] Example 2

[0039] The cooling platform 10 is disposed on the lower heating blade 2. The cooling platform 10, the heat insulation layer 11, and the lower heating blade 2 are sequentially exposed on the same side with a first step surface 13, a second step surface 14, and a third step surface 15. The second step surface 14 is provided with a plurality of hexagonal set bolts 16. The hexagonal set bolts 16 penetrate the second step surface 14 and are partially screwed into the first step surface 13. The third step surface 15 is also provided with a plurality of hexagonal set bolts 16. The hexagonal set bolts 16 penetrate the third step surface 15 and are partially screwed into the second step surface 14.

[0040] The above embodiment is implemented as follows: the first step surface 13 is on the cooling table 10, the second step surface 14 is on the heat insulation layer 11, and the third step surface 15 is on the lower heating blade 2. The heat insulation layer 11 is fixed to the cooling table 10 by the first step surface 13 and the second step surface 14, and the lower heating blade 2 is fixed to the heat insulation layer 11 by the second step surface 14 and the third step surface 15. This ensures that there are no other parts of the cooling table 10 and the lower heating blade 2 in direct contact. Therefore, the high temperature on the lower heating blade 2 cannot be transferred to the cooling table 10 through any direct medium, effectively preventing the temperature of the cooling table 10 from rising rapidly.

[0041] Example 3

[0042] The upper heating blade 1 and the lower heating blade 2 each have a heating plate 17 fixedly attached to one end away from the zipper template 3.

[0043] Except for the heat insulation layer 11, both the upper heatsink 1 and the lower heatsink 2 are made of metal materials with good thermal conductivity.

[0044] The heat insulation layer 11 is made of glass fiber.

[0045] The zipper template 3 has a film support portion 4 with two cooling holes 12, and coolant flows through the cooling holes 12.

[0046] The above embodiment is implemented as follows: the heating plate 17 heats up and transfers heat to the copper hot knife, so that the hot knife can reach the temperature required for heat sealing. The heat insulation layer 11 of glass fiber material isolates the cooling table 10 from the heating part of the hot knife. Glass fiber has excellent heat insulation properties, so that the zipper and plastic film 8 in contact with the cooling table 10 will not be burned to stick together.

[0047] The film holding part 4 and the heat-sealing mating part 5 are integrally formed. The cooling hole 12 provided on the film holding part 4 has the important function of cooling the heat-sealing mating part. The heat-sealing mating part 5 is partially inserted between the upper zipper 6 and the lower zipper 7 to prevent the upper zipper 6 and the lower zipper 7 from sticking together during the heat sealing process. However, under long-term operation, the heat from the upper heat-sealing blade 1 and the lower heat-sealing blade 2 will be transferred to the heat-sealing mating part 5. If the heat-sealing mating part 5 is not cooled, the temperature of the heat-sealing mating part 5 will be too high and will damage the zipper.

[0048] Example 4

[0049] The cooling channel 23 of the cooling platform 10 and the cooling hole 12 of the zipper template 3 are both fixedly connected with anti-detachment heads 18. The anti-detachment heads 18 are composed of multiple conical tube heads 19 arranged in sequence, and the conical surface of the conical tube head 19 is away from the cooling hole 12 or the cooling channel 23.

[0050] The end of the heating plate 17 away from the upper hot knife 1 or the lower hot knife 2 is also provided with a heat insulation plate 22.

[0051] In this embodiment, the anti-detachment head 18 is used to connect the cooling hole 12 and the cooling channel 23 to the external refrigeration equipment. Typically, a rubber tube is used for connection. The rubber tube can be directly sleeved on the anti-detachment head 18. The cone bottom diameter of the conical tube head 19 is relatively large, and the rubber tube deforms greatly at this part, generating greater pressure, making it difficult for the rubber tube to fall off.

[0052] Example 5

[0053] Along the feeding direction of the zipper and plastic film 8, a cooling plate 20 is provided behind the upper heat-sealing blade 1 and the lower heat-sealing blade 2. The cooling plate 20 is used to cool the plastic film 8 and the zipper that have been heat-sealed.

[0054] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A heat-sealing device for a child lock zipper, used for heat-sealing a zipper and a plastic film (8), characterized in that, The device includes an upper heatsink (1), a lower heatsink (2), and a zipper template (3). The zipper template (3) is installed between the upper heatsink (1) and the lower heatsink (2). The zipper template (3) includes a film holding part (4) and a heat-sealing mating part (5). There are two zipper templates (3) with the heat-sealing mating parts (5) facing each other. The thickness of the film holding part (4) is greater than that of the heat-sealing mating part (5) to form a space that can accommodate the zipper. The zipper is divided into an upper zipper (6) and a lower zipper (7). The upper zipper (6) and the lower zipper (7) are engaged and snapped together. The heat-sealing part (5) is inserted between the upper zipper (6) and the lower zipper (7) to hold the zipper in place. The upper heatsink (1) and the lower heatsink (2) each have two protrusions (9). The protrusions (9) cooperate with the heat-sealing mating part (5) to press the part that needs to be heat-sealed between the zipper and the plastic film (8) onto the heat-sealing mating part (5). One of the protrusions (9) of the upper heatsink (1) or the lower heatsink (2) is a cooling platform (10). A cooling channel (23) is opened inside the cooling platform (10). The cooling platform (10) is isolated from other parts of the upper heatsink (1) or the lower heatsink (2) by a heat insulation layer (11). Cooling liquid flows in the cooling channel (23). The cooling platform (10) is set on the lower heating knife (2). The cooling platform (10), the heat insulation layer (11) and the lower heating knife (2) are exposed on the same side in sequence with a first step surface (13), a second step surface (14) and a third step surface (15). The second step surface (14) is provided with a number of internal hexagonal set bolts (16). The internal hexagonal set bolts (16) penetrate the second step surface (14) and are partially screwed into the first step surface (13). The third step surface (15) is also provided with a number of internal hexagonal set bolts (16). The internal hexagonal set bolts (16) penetrate the third step surface (15) and are partially screwed into the second step surface (14).

2. The child lock zipper heat sealing device according to claim 1, characterized in that, The upper heating blade (1) and the lower heating blade (2) are each fixedly attached to an electric heating plate (17) at one end away from the zipper template (3).

3. The child lock zipper heat sealing device according to claim 1, characterized in that, Except for the heat insulation layer (11), both the upper heat-dissipating blade (1) and the lower heat-dissipating blade (2) are made of metal materials with good thermal conductivity.

4. The child lock zipper heat sealing device according to claim 1, characterized in that, The heat insulation layer (11) is made of glass fiber.

5. The child lock zipper heat sealing device according to claim 1, characterized in that, The zipper template (3) has a film support part (4) with two cooling holes (12) through which coolant flows.

6. The child lock zipper heat sealing device according to claim 1 or 5, characterized in that, The cooling channel (23) of the cooling platform (10) and the cooling hole (12) of the zipper template (3) are fixedly connected with anti-detachment heads (18). The anti-detachment heads (18) are composed of multiple conical tube heads (19) arranged in sequence. The conical surface of the conical tube head (19) is away from the cooling hole (12) or cooling channel (23).

7. The child lock zipper heat sealing device according to claim 2, characterized in that, The end of the heating plate (17) away from the upper hot knife (1) or the lower hot knife (2) is also provided with a heat insulation plate (22).

8. The child lock zipper heat sealing device according to claim 1, characterized in that, A cooling plate (20) is provided behind the upper hot knife (1) and the lower hot knife (2) along the feeding direction of the zipper and the plastic film (8).

9. The child lock zipper heat sealing device according to claim 8, characterized in that, The cooling plate (20) is provided with a pipe joint (21), which is used to connect the cooling path inside the cooling plate (20) to an external refrigeration device.

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