A low-migration plastic cap for food

Abstract

This utility model discloses a low-migration food-grade plastic lid, comprising a lid body with an internal metal layer for isolating the liquid. An eccentrically positioned vent hole extends upwards through the lid body. A recessed layer coinciding with the axis of the vent hole is formed on the upper surface of the lid body. A longitudinal tube extending into the vent hole is integrally formed on the upper surface of the metal layer. An extension piece embedded in the recessed layer is integrally formed on the upper end of the longitudinal tube, with its outer end face flush with the upper surface of the lid body. A control part for controlling the opening and closing of the longitudinal tube is also provided at the upper end of the lid body. The control part includes a rotatable shaft located at the outer end of the lid body, with a sealing element at one end for sealing the longitudinal tube. Compared with the prior art, the advantage of this utility model is that by setting a food-grade stainless steel metal layer inside the lid body, the liquid inside the cup is completely isolated from the plastic, reducing the possibility of plastic material migrating into the liquid under high temperature or prolonged contact conditions.

Description

Technical Field

[0001] This utility model relates to the field of plastic cap technology, and in particular to a low-migration plastic cap for food. Background Technology

[0002] Plastic caps are primarily used for sealing bottling equipment. However, plastic caps are generally composed of high-molecular polymers and various additives. Under high temperatures or prolonged contact, the amount of migration is more likely to increase. Increased temperature intensifies the movement of polymer chains, providing more "channels" and energy for smaller molecule additives, making them easier to diffuse out. Secondly, migration is a cumulative process over time; the longer the contact time, the greater the total amount of migration may be. Furthermore, if the plastic cap is damaged due to mechanical force, the internal substances are more likely to seep out, increasing the amount of migration.

[0003] Because the liquid inside a thermos cools down slowly, the plastic lid remains at a relatively high temperature for an extended period. This prolonged contact between the lid and the hot liquid can increase the risk of liquid migration. Additionally, once the liquid cools, the internal pressure of the thermos becomes significantly lower than the external atmospheric pressure, causing the lid to be firmly pressed down. This makes it difficult for certain individuals to open the thermos. Therefore, we propose improvements to the existing plastic lids for thermoses. Utility Model Content

[0004] In view of the problems mentioned above, this utility model aims to provide a plastic cap for food with low migration.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a plastic lid for food with low migration amount, including a lid body, a metal layer for isolating the material inside the lid body, an eccentrically arranged vent hole penetrating the lid body from the inside upward, a concave layer coinciding with the axis of the vent hole on the upper end surface of the lid body, a longitudinal tube extending into the vent hole integrally on the upper end surface of the metal layer, an extension piece embedded in the concave layer integrally on the upper end of the longitudinal tube, and the outer end surface of the extension piece being flush with the upper end surface of the lid body. The upper end of the cup lid body is also provided with a control part for controlling the opening and closing of the longitudinal tube. The control part includes a rotating shaft located at the outer end of the cup lid body and rotatably disposed thereon. One end of the rotating shaft is provided with a sealing element, which is used to seal the longitudinal tube.

[0006] A further preferred embodiment of this utility model is: an integral limiting ring is formed on the inner wall of the cup lid body, the diameter of the limiting ring is smaller than the inner diameter of the cup lid body, and the metal layer is attached to the cup lid body and the limiting ring. A sealing ring is fitted on the outside of the limiting ring. The sealing ring is stuck on the outside of the metal layer. When the cup lid body and the thermos cup are in contact, the sealing ring is squeezed against the mouth of the thermos cup.

[0007] A further preferred embodiment of this utility model is that the metal layer is a food-grade stainless steel sheet.

[0008] A further preferred embodiment of this utility model is: the outer end face of the cup lid body has an integral ring with an internal cavity, the outer end of the ring is fastened with an end cap, and the outer end face of the end cap is provided with an arc-shaped control port one and a control port two. The outer end of the cup lid body has an integral shaft end, and the rotating shaft is sleeved on the shaft end and can be rotated. The outer side of the end cover has a bolt that penetrates the end cover and is threaded to the shaft end. The bolt is used to press and fix the end cover. The rotating shaft is clamped between the outer side of the end cover and the outer side of the cup lid body. Near the other end of the rotating shaft, there is a control end that extends out of the control port. By rotating the control end, the position of the seal is changed, and the longitudinal tube is opened or closed.

[0009] A further preferred embodiment of this utility model is: the shaft end is eccentrically positioned towards the longitudinal tube, and the axes of both control port one and control port two coincide with the shaft end.

[0010] A further preferred embodiment of this utility model is: the sealing element includes a threaded shaft and a sealing layer fixed to the lower end of the threaded shaft; The limiting end is annular with threads on its inner wall. The threaded shaft is threaded to the limiting end. The sealing layer extends downward to close the longitudinal tube. The upper end of the threaded shaft extends to the control port 2. The outer wall of the threaded shaft has textures for manual twisting. Twisting the threaded shaft controls the change of the upper and lower position of the sealing layer.

[0011] A further preferred embodiment of this utility model is that the sealing layer is made of food-grade rubber.

[0012] A further preferred embodiment of this utility model is: the sealing layer is cylindrical, with a diameter larger than that of the longitudinal tube, and the lower edge of the sealing layer is rounded.

[0013] A further preferred embodiment of this utility model is that the inward-facing side of the connection position between the longitudinal tube and the extension piece is rounded.

[0014] Compared with the prior art, the advantages of this utility model are: 1. By setting a food-grade stainless steel metal layer inside the cup lid, the liquid inside the cup is completely isolated from the plastic, reducing the possibility of plastic material migrating into the liquid under high temperature or long-term contact conditions.

[0015] 2. The longitudinal tube on the metal layer serves as a channel for balancing internal and external air pressure. After the liquid inside the thermos cools down, it can quickly balance the internal and external air pressure, making it easy to open the lid. By simply rotating the control end, the internal seal can be driven away from the longitudinal tube opening, allowing outside air to enter the cup and quickly balance the air pressure.

[0016] 3. The metal layer is mechanically fixed to the cup lid body through an integrated longitudinal tube and extension piece, avoiding the use of adhesives and eliminating the migration risk that adhesives may bring. The cup lid is opened after the air pressure is balanced by the longitudinal tube, avoiding the risk that the metal layer will be adsorbed at the cup mouth due to negative pressure inside the cup and forcibly separated from the plastic cup lid body, thus ensuring the durability of the product. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of a half-section of the cup lid body of this utility model; Figure 3 This is an exploded structural diagram of the cup lid body, metal layer, and sealing ring of this utility model; Figure 4 This is an exploded structural diagram of the cup lid body and the metal layer of this utility model; Figure 5 This is a schematic diagram of the control unit structure of this utility model; Figure 6 This is a schematic diagram of the overall half-section structure of this utility model; Figure 7 This utility model Figure 6 A magnified schematic diagram of part A in the diagram.

[0019] In the diagram: 1. Cup lid body; 11. Limiting ring; 12. Vent hole; 13. Recessed layer; 2. Ring body; 3. End cap; 31. Control port one; 32. Control port two; 4. Control part; 41. Shaft end; 42. Rotating shaft; 43. Bolt; 44. Control end; 45. Limiting end; 46. Seal; 461. Threaded shaft; 462. Sealing layer; 5. Metal layer; 51. Longitudinal tube; 52. Extension piece; 6. Sealing ring. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0021] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0022] This embodiment mainly describes a low-migration plastic cap for food. Please refer to [link / reference]. Figures 1-7 Specifically, the following is a description of a plastic lid: Under high temperature or prolonged contact, the migration of liquid is more likely to increase. Therefore, to reduce the migration, it is necessary to reduce the contact time between the liquid and the plastic lid or to prevent the liquid from contacting the liquid at high temperature. However, when using a thermos, the lid will inevitably come into contact with the plastic lid. Based on this problem, a low migration food plastic lid is proposed, which includes a lid body 1. The lid body 1 has a metal layer 5 inside for isolating the liquid. An eccentrically arranged vent hole 12 is inserted through the lid body 1. A concave layer 13 is opened on the upper end surface of the lid body 1, which is coincident with the axis of the vent hole 12. A longitudinal tube 51 extending into the vent hole 12 is integrally formed on the upper end surface of the metal layer 5. An extension piece 52 embedded in the concave layer 13 is integrally formed on the upper end of the longitudinal tube 51. The outer end surface of the extension piece 52 is flush with the upper end surface of the lid body 1. The upper end of the cup lid body 1 is also provided with a control part 4 for controlling the opening and closing of the longitudinal tube 51. The control part 4 includes a rotating shaft 42 that is provided at the outer end of the cup lid body 1 and can be rotated. One end of the rotating shaft 42 is provided with a sealing element 46, which is used to close the longitudinal tube 51.

[0023] Specifically, a metal layer 5 is provided inside the lid body 1 to isolate the lid body 1 from the liquid, which can minimize the migration of plastic. At the same time, the metal layer 5 can be fixed to the inside of the lid body 1 without other adhesives through the longitudinal tube 51 and the extension piece 52. After the liquid in the thermos cools down, the external air pressure presses the lid body 1 down. By opening the longitudinal tube 51, the air pressure on both sides of the lid body 1 can be made the same, which makes it easier to open the lid body 1 later. It should also be noted that since the longitudinal tube 51 can be opened and closed through the sealing element 46 to make the internal and external air pressure the same, the metal layer 5 inside will not be adsorbed at the opening of the thermos when the lid body 1 is opened, thus avoiding the separation of the metal layer 5 from the lid body 1.

[0024] like Figure 3 As shown, a limiting ring 11 is integrally formed on the inner wall of the cup lid body 1. The diameter of the limiting ring 11 is smaller than the inner diameter of the cup lid body 1. The metal layer 5 is attached to the cup lid body 1 and the limiting ring 11. A sealing ring 6 is fitted on the outside of the limiting ring 11. The sealing ring 6 is locked on the outside of the metal layer 5. When the cup lid body 1 is in contact with the thermos, the sealing ring 6 is squeezed against the mouth of the thermos.

[0025] Specifically, the limiting ring 11 on the inner wall of the cup lid body 1 is used to hold the sealing ring 6 and the metal layer 5 in place, ensuring that the sealing ring 6 and the metal layer 5 remain aligned with the cup lid body 1 and preventing positional displacement. It should be noted that the sealing ring 6 is a commonly used sealing structure on existing cup lids and is also food-grade. Because the sealing ring 6 is elastic, it can be snapped in place on the outside of the metal layer 5 and the limiting ring 11, preventing the sealing ring 6 from falling out.

[0026] The metal layer 5 is a food-grade stainless steel sheet. The sheet material reduces the amount of material used while isolating the liquid from the cup lid body 1.

[0027] like Figures 1-5 As shown, the outer end face of the cup lid body 1 is integrally formed with a ring body 2 having an internal cavity. An end cap 3 is fastened to the outer end of the ring body 2. An arc-shaped control port 31 and a control port 32 are provided on the outer end face of the end cap 3. The outer end of the cup lid body 1 has an integral shaft end 41. The rotating shaft 42 is sleeved on the shaft end 41 and can be rotated. The outer side of the end cover 3 has a bolt 43 that passes through the end cover 3 and is threaded to the shaft end 41. The bolt 43 is used to press and fix the end cover 3. The rotating shaft 42 is clamped between the end cover 3 and the outer side of the cup lid body 1. The outer side of the rotating shaft 42 near the other end has a control end 44 that extends out of the control port 31. By rotating the control end 44, the position of the sealing element 46 is changed, and the longitudinal tube 51 is opened or closed.

[0028] Specifically, the cup lid body 1 forms a chamber inside the ring 2 and the end cap 3. The control part 4 is installed in the chamber. The control part 4 is connected to the control end 44 at the other end by the rotating shaft 42 and the seal 46 at one end of the rotating shaft 42. By rotating the control end 44, the rotating shaft 42 is rotated along the shaft end 41, changing the position of the seal 46 and opening and closing the longitudinal tube 51.

[0029] like Figure 5 As shown, the shaft end 41 is eccentrically positioned towards the longitudinal tube 51, and the axes of control port 1 31 and control port 2 32 both coincide with the shaft end 41.

[0030] Specifically, the shaft end 41 is set to be biased towards the longitudinal tube 51, so that the position where the rotating shaft 42 connects to the shaft end 41 is closer to the limiting end 45 and relatively farther away from the control end 44. This makes it easier to manually push the control end 44 along the control port 31, improving operability. It should be noted that the length of the hole control end 44 extending out of the control port 31 is limited, making it less likely to accidentally open the longitudinal tube 51.

[0031] like Figures 5-7 As shown, the seal 46 includes a threaded shaft 461 and a sealing layer 462 fixed to the lower end of the threaded shaft 461. The limiting end 45 is annular with threads on its inner wall. The threaded shaft 461 is threadedly connected to the limiting end 45. The sealing layer 462 extends downward to close the longitudinal tube 51. The upper end of the threaded shaft 461 extends to the control port 32. The outer wall of the threaded shaft 461 has a manually twisting texture. Twisting the threaded shaft 461 controls the vertical position of the sealing layer 462.

[0032] Specifically, the threaded shaft 461 can rotate along the limiting end 45, so that the threaded shaft 461 moves up and down within the limiting end 45 to change its position. The position of the sealing layer 462 at the lower end of the threaded shaft 461 also changes with the position of the threaded shaft 461. The sealing layer 462 is used to seal the longitudinal tube 51. When it moves downward, the seal becomes tighter. When the sealing layer 462 experiences local aging, the threaded shaft 461 can be rotated to make the sealing layer 462 move downward.

[0033] The sealing layer 462 is made of food-grade rubber. The lower end of the sealing layer 462 is in direct contact with the liquid in the cup, so the material of the sealing layer 462 needs to be strictly limited.

[0034] like Figure 7 As shown, the sealing layer 462 is cylindrical, with a diameter larger than that of the longitudinal tube 51, and the lower edge of the sealing layer 462 is rounded. Specifically, the cylindrical design of the sealing layer 462 is intended to mate with the cylindrical longitudinal tube 51 to seal the longitudinal tube 51.

[0035] The inward-facing side of the connection between the longitudinal tube 51 and the extension piece 52 is rounded. Specifically, when the sealing layer 462 moves horizontally, it will be squeezed against the extension piece 52. Therefore, by making the inward-facing side of the connection between the longitudinal tube 51 and the extension piece 52 rounded, the sealing layer 462 can be smoothly transitioned, avoiding jamming and preventing damage to the sealing layer 462.

[0036] Working principle: During use, the cup lid body 1 is put into contact with the thermos cup, and the opening of the thermos cup abuts against the sealing ring 6 to achieve a sealing effect. At the same time, the liquid inside the thermos cup will come into contact with the metal layer 5 and will not come into direct contact with the plastic of the cup lid body 1, thus minimizing the amount of migration.

[0037] Secondly, through the set longitudinal tube 51 and extension piece 52, the extension piece 52 is set in the recessed layer 13. The extension piece 52 is integrated with the metal layer 5 through the longitudinal tube 51. Therefore, the metal layer 5 is limited by the cup lid body 1, and the position between the metal layer 5 and the cup lid body 1 is fixed without adding adhesive, and it is not easy to detach.

[0038] It should be noted that after the temperature of the liquid inside the thermos decreases, the lid body 1 is firmly pressed down, making it difficult to open. Therefore, by rotating the control terminal 44, the rotating shaft 42 rotates, changing the position of the sealing element 46, allowing the longitudinal tube 51 to open. External gas enters the thermos, balancing the internal and external air pressure, making it easier to open the lid body 1. This operation can be achieved simply by rotating the control terminal 44, making it more convenient. However, if the sealing layer 462 is compressed and difficult to reset, leakage may occur in the longitudinal tube 51. Therefore, rotating the threaded shaft 461 allows the sealing layer 462 to move downwards, improving the sealing effect. Simultaneously, the liquid inside the thermos will only contact the sealing ring 6, the sealing layer 462, the metal layer 5, and the longitudinal tube 51, without contacting the plastic part of the lid body 1, minimizing migration.

[0039] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] The above provides a detailed description of a low-migration food plastic cap provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A low-migration plastic lid for food, comprising a lid body, characterized in that, The cup lid body has an internal metal layer for insulation. An eccentrically positioned vent hole runs through the inside of the cup lid body. A recessed layer is formed on the upper surface of the cup lid body that coincides with the axis of the vent hole. A longitudinal tube extending into the vent hole is integrally formed on the upper surface of the metal layer. An extension piece is integrally embedded in the recessed layer at the upper end of the longitudinal tube. The outer end face of the extension piece is flush with the upper surface of the cup lid body. The upper end of the cup lid body is also provided with a control part for controlling the opening and closing of the longitudinal tube. The control part includes a rotating shaft located at the outer end of the cup lid body and rotatably disposed thereon. One end of the rotating shaft is provided with a sealing element, which is used to seal the longitudinal tube.

2. The low-migration food-grade plastic cap according to claim 1, characterized in that, The inner wall of the cup lid body is integrated with a limiting ring. The diameter of the limiting ring is smaller than the inner diameter of the cup lid body. The metal layer is attached to the cup lid body and the limiting ring. A sealing ring is fitted on the outside of the limiting ring. The sealing ring is stuck on the outside of the metal layer. When the cup lid body and the thermos cup are in contact, the sealing ring is squeezed against the mouth of the thermos cup.

3. The low-migration food-grade plastic cap according to claim 1, characterized in that, The metal layer is a food-grade stainless steel sheet.

4. The low-migration food-grade plastic cap according to claim 1, characterized in that, The outer end face of the cup lid has an integral ring with an internal cavity. An end cap is fastened to the outer end of the ring. The outer end face of the end cap has an arc-shaped control port one and a control port two. The outer end of the cup lid body has an integral shaft end, and the rotating shaft is sleeved on the shaft end and can be rotated. The outer side of the end cover has a bolt that penetrates the end cover and is threaded to the shaft end. The bolt is used to press and fix the end cover. The rotating shaft is clamped between the outer side of the end cover and the outer side of the cup lid body. Near the other end of the rotating shaft, there is a control end that extends out of the control port. By rotating the control end, the position of the seal is changed, and the longitudinal tube is opened or closed.

5. The low-migration food-grade plastic cap according to claim 4, characterized in that, The shaft end is eccentrically positioned towards the longitudinal tube, and the axes of control port one and control port two coincide with the shaft end.

6. The low-migration food plastic cap according to claim 4, characterized in that, The sealing element includes a threaded shaft and a sealing layer fixed to the lower end of the threaded shaft; The limiting end is annular with threads on its inner wall. The threaded shaft is threaded to the limiting end. The sealing layer extends downward to close the longitudinal tube. The upper end of the threaded shaft extends to the control port 2. The outer wall of the threaded shaft has textures for manual twisting. Twisting the threaded shaft controls the change of the upper and lower position of the sealing layer.

7. The low-migration food plastic cap according to claim 6, characterized in that, The sealing layer is made of food-grade rubber.

8. The low-migration food plastic cap according to claim 6, characterized in that, The sealing layer is cylindrical, with a diameter larger than that of the longitudinal pipe, and the lower edge of the sealing layer is rounded.

9. The low-migration food plastic cap according to claim 6, characterized in that, The inward-facing side of the connection between the longitudinal tube and the extension plate has a rounded corner.

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