High-sealing pull ring type inner cover for polyethylene blow molding container

Abstract

The utility model relates to a high-sealing pull ring type inner cover for a polyethylene blow molding container. The high-sealing pull ring type inner cover comprises a concave sealing part, a cover edge and an opening part, wherein the cover edge is arranged at a concave opening of the sealing part and extends outwards in the radial direction; the opening part is arranged at the concave inner bottom of the sealing part; the outer diameter is in interference fit with the size of the inner wall of an adaptive container opening, and a circle of deformation part is arranged on the side, facing the sealing part, of the cover edge. The inner cover is matched with a container opening, the sealing part is inserted into the container opening, the peripheral face of the sealing part makes contact with the inner wall of the container opening to form interference fit, and therefore sealing is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of containers, and particularly relates to a high-sealing pull-ring type inner cover for a polyethylene blow-molded container. Background Art

[0002] A blow-molded container is a container processed by a hollow molding method. Currently, most blow-molded containers are used to hold liquid substances. Most blow-molded containers have requirements for sealing. Especially during transportation, in order to prevent the liquid in the container from sloshing out or leaking from the container mouth, after the container is filled with liquid substances, a sealing structure will be set at the container mouth position.

[0003] Based on this situation, the commonly used sealing structure at present is mostly to set a sealing film at the container mouth. The sealing film can achieve a perfect seal of the blow-molded container and is not afraid of transportation. When in use, the sealing film can be torn off. However, this sealing film is completed by the liquid filling manufacturer. This sealing film is a disposable structure. Once torn off, it no longer has a sealing effect, which affects the subsequent sealing of the container and causes the container to be not tightly sealed. Therefore, the sealing of the container is improved, and a sealing gasket is set at the inner bottom of the container lid to ensure the sealing during subsequent use. However, using the sealing gasket brings new problems. The sealing gasket is prone to fluffing and tearing after being used for a long time, and sometimes it cannot be used after being soaked in liquid, which still causes the container to be not tightly sealed.

[0004] Therefore, a new sealing structure is needed to solve the problem of the sealing during the use of the blow-molded container after it is opened. Summary of the Invention

[0005] The utility model provides a high-sealing pull-ring type inner cover for a polyethylene blow-molded container. The inner cover cooperates with the container mouth to form a sealing structure, so that the container can be sealed by the inner cover during the use process.

[0006] The utility model provides a high-sealing pull-ring type inner cover for a polyethylene blow-molded container. The inner cover cooperates with the container mouth, and the outer cover clamps the edge of the inner cover along the container mouth to form a seal.

[0007] The specific technical solution of the utility model is as follows: A high-sealing pull-ring type inner cover for a polyethylene blow-molded container, including a concave sealing part, a cover edge extending radially outwardly at the concave opening of the sealing part, and an opening component arranged at the concave inner bottom of the sealing part; the outer periphery of the sealing part has an outer diameter that is in interference fit with the inner wall size of the adapted container mouth, and a deformation part is arranged on one side of the cover edge facing the sealing part in a circle.

[0008] The inner lid is matched with the container opening. The sealing part is inserted into the container opening, and an interference fit is formed between the outer peripheral surface of the sealing part and the inner wall of the container opening, thereby achieving sealing. The lid edge extends radially outward from the notch of the sealing part. After the sealing part is inserted into the container opening, the lid edge is located at the end face part of the container opening, which can position the inner lid, determine the mating depth between the inner lid and the container opening, and also limit the position where the sealing part contacts the inner wall of the container opening. A deformation part is provided on the lid edge. The so-called deformation part means that it can deform under an external force, and a restoring force will be generated after deformation. The deformation part faces the sealing part. After the lid edge is placed on the end face of the container opening, the deformation part contacts the end face of the container opening. After the outer lid of the container is tightened, an axial force will be generated on the inner lid. This axial force will squeeze the lid edge, causing the deformation part to deform under the axial force, so that a pressing seal is established between the inner lid and the end face of the container opening, thereby improving the sealing performance of the inner lid. The opening component is used to open the inner lid and separate the inner lid from the container opening.

[0009] Preferably, the end face of the deformation part is conical, and the perpendicular line of the conical end face inclines outward, that is, the small-diameter end of the cone faces the sealing part. There is a deformation space between the deformation part and the outer periphery of the sealing part.

[0010] The conical end face of the deformation part is in line contact with the end face of the container opening. After deformation, it gradually changes from line contact to surface contact, thereby improving the seal between the deformation part and the end face of the container opening. The deformation space can provide a deformation space for the deformation part.

[0011] Preferably, a first convex ring is provided on the circumferential inner wall of the sealing part, and the position of the first convex ring corresponds to the position of the deformation part. The first convex ring can strengthen the sealing part. When the deformation part deforms, it ensures that the sealing part is not affected, thereby ensuring the contact seal between the sealing part and the inner wall of the container opening.

[0012] Preferably, an axially protruding extrusion part is provided at the notch of the sealing part, and the outer side surface of the extrusion part is a conical surface; the axial height of the extrusion part is greater than the axial height of the deformation part. The outer side surface of the extrusion part is a conical surface, so when the outer lid is tightened, it makes the inner lid centered and has a tendency of axial movement, and the deformation of the deformation part is uniform.

[0013] Preferably, the inner diameter dimension of the inner wall of the extrusion part is greater than the inner diameter dimension of the circumferential inner wall of the sealing part, and the inner diameter dimension of the inner wall of the extrusion part is less than the outer diameter dimension of the circumferential inner wall of the sealing part.

[0014] Preferably, a second convex ring is provided at the position where the inner wall of the notch of the sealing part faces the extrusion part. The inner wall of the second convex ring is conical, and the axial end face of the second convex ring is in the shape of a radial ring surface. The plane where the radial ring surface is located is in the same plane as the axial end face of the lid edge.

[0015] Preferably, the sealing part is divided into two parts, namely a conical bottom and a cylindrical ring part, with a rounded corner transition between the conical bottom and the cylindrical ring part. The size of the conical bottom is smaller than the inner diameter of the container mouth, which facilitates the cooperation between the inner lid and the container mouth.

[0016] Preferably, the opening component is connected to the edge part of the inner bottom of the sealing part, and the opening component is connected to the inner bottom of the sealing part in an inclined shape. The connection part between the opening component and the sealing part is at the edge position. In this way, when using the opening component, the acting force will first act on the connected side, so that when the inner lid is opened, it will be separated from the container mouth in an inclined prying manner, which is more convenient for separation.

[0017] Preferably, the opening component includes a connecting part and an opening part. The connecting part is in the shape of a flat strip, and the opening part is in the shape of a circular ring. The overall length of the opening component is smaller than the diameter of the sealing part.

[0018] The beneficial effects of the present utility model are as follows: 1. The inner lid cooperates with the container mouth, and the sealing part is inserted into the container mouth. The outer peripheral surface of the sealing part contacts the inner wall of the container mouth to form an interference fit, thereby achieving sealing;

[0019] 2. The cover edge extends radially outward from the notch of the sealing part. After the sealing part is inserted into the container mouth, the cover edge is located at the end face part of the container mouth, which can position the inner lid, determine the cooperation depth between the inner lid and the container mouth, and also limit the position where the sealing part contacts the inner wall of the container mouth;

[0020] 3. The cover edge is provided with a deformation part. The so-called deformation part means that it can deform under the action of an external force, and a restoring force will be generated after deformation. The deformation part faces the sealing part. In this way, after the cover edge is placed on the end face of the container mouth, the deformation part contacts the end face of the container mouth. After the outer cover of the container is tightened, an axial acting force will be generated on the inner lid. This axial acting force will squeeze the cover edge, causing the deformation part to deform under the axial acting force, so that a tight seal is established between the inner lid and the end face of the container mouth, thereby improving the sealing performance of the inner lid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0022] Figure 2 is a partial cross-sectional view of the present utility model;

[0023] Figure 3 is the present utility model Figure 2 An enlarged schematic view of part A of the structure shown;

[0024] Figure 4 is an assembly schematic diagram of the present utility model in use;

[0025] In the figure: 1. Sealing part, 2. Cover edge, 3. Extrusion part, 4. Second convex ring, 5. First convex ring, 6. Opening component, 7. Deformation part, 8. Deformation space, 9. Outer cover, 10. Container opening, 11. Container. Detailed implementation mode

[0026] The present utility model will be further described below through specific embodiments in conjunction with the accompanying drawings. Embodiment

[0027] As Figure 1 Figure 2 Figure 3 As shown, a high-sealing pull-ring type inner cover for a polyethylene blow-molded container includes a sealing part 1 with a closed bottom and an overall concave shape, a cover edge 2 arranged at the concave opening of the sealing part and extending radially outward, and an opening component 6 arranged at the concave inner bottom of the sealing part.

[0028] The sealing part is divided into two parts, namely a conical bottom and a cylindrical ring part. There is a rounded corner transition between the conical bottom and the cylindrical ring part. The small-diameter end of the conical bottom is a closed structure, and the axial height of the conical bottom is greater than the axial height of the cylindrical ring part. The outer circumference of the cylindrical ring part has an outer diameter that is in interference fit with the inner wall size of the adapted container opening 10, and the interference amount is controlled at about 0.5 mm.

[0029] The outer diameter of the cover edge is greater than the outer diameter of the cylindrical ring part. A ring of deformation parts 7 is arranged on the side of the cover edge facing the sealing part. There is a deformation space 8 between the deformation part and the outer circumference of the cylindrical ring part. The end face of the deformation part is conical, and the perpendicular line of the conical end face inclines outward, that is, the small-diameter end of the cone faces the sealing part side. A first convex ring 5 is arranged on the inner wall of the cylindrical ring part, and the position of the first convex ring corresponds to the position of the deformation part. The cross-section of the first convex ring is in the shape of a right triangle, and one of the right-angled sides is radial. The radial ring surface where this right-angled side is located is in the same plane as the plane where the small-diameter end of the deformation part is located. A second convex ring 4 is arranged on the inner wall of the container opening. The second convex ring is biased towards the mouth part of the sealing part relative to the first convex ring. The inner wall of the second convex ring is conical, and the axial end face of the second convex ring is in the shape of a radial ring surface. The plane where the radial ring surface is located is in the same plane as the axial end face of the cover edge. An axially protruding extrusion part 3 is arranged at the concave opening of the sealing part. The outer side surface of the extrusion part is a conical surface, and the axial height of the extrusion part is greater than the axial height of the deformation part. The inner diameter size of the inner wall of the extrusion part is greater than the inner diameter size of the circumferential inner wall of the sealing part, and the inner diameter size of the inner wall of the extrusion part is less than the outer diameter size of the circumferential inner wall of the sealing part.

[0030] The opening component 6 includes a connecting part and an opening part. The connecting part is in the shape of a flat strip, the opening part is in the shape of a circular ring, and the overall length of the opening component is less than the diameter of the sealing part. The connecting part of the opening component is connected to the edge part of the inner bottom of the sealing part, and the whole opening component is inclined relative to the bottom of the sealing part.

[0031] AsFigure 4 As shown, the container mouth 10 of the polyethylene blow-molded container 11 has a cylindrical inner wall. The outer wall of the container mouth is provided with an external thread, and the inner wall of the outer cap 9 is provided with an internal thread, which is adapted to the external thread. The sealing part of the inner cap is inserted into the container mouth, the deformed part of the lid edge contacts the end face of the container mouth, the cylindrical ring part is in interference fit with the inner wall of the container mouth, the outer cap is screwed onto the container mouth, and the inner bottom of the outer cap presses the lid edge of the inner cap.

[0032] The above are only the preferred embodiments of the present invention, and do not impose any restrictions on the present invention. Any simple modifications, changes, and equivalent transformations made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-sealing pull-ring type inner lid for a polyethylene blow-molded container, characterized in that, It includes a concave sealing part (1), a radially extending cover edge (2) provided at the notch of the sealing part, and an opening member (6) provided at the concave inner bottom of the sealing part; the outer periphery of the sealing part has an outer diameter that is in an interference fit with the inner wall size of the mouth of the adapted container, and a deformation part (7) is provided on one side of the cover edge facing the sealing part.

2. The high-sealing pull-ring type inner lid for a polyethylene blow-molded container according to claim 1, characterized in that, The end face of the deformation part is conical, and the perpendicular line of the conical end face inclines outward, that is, the small-diameter end of the cone faces the sealing part; there is a deformation space (8) between the deformation part and the outer periphery of the sealing part.

3. The high-sealing pull-ring type inner lid for a polyethylene blow-molded container according to claim 2, wherein A first convex ring (5) is provided on the circumferential inner wall of the sealing part, and the position of the first convex ring corresponds to the position of the deformation part.

4. A high-sealing pull-ring type inner cap for a polyethylene blow-molded container according to claim 1 or 2 or 3, characterized in that, An axially protruding extrusion part (3) is provided at the notch of the sealing part, and the outer side surface of the extrusion part is a conical surface; the axial height of the extrusion part is greater than the axial height of the deformation part.

5. The high-sealing pull-ring type inner cap for a polyethylene blow-molded container according to claim 4, wherein, The inner diameter of the inner wall of the extrusion part is larger than the inner diameter of the circumferential inner wall of the sealing part, and the inner diameter of the inner wall of the extrusion part is smaller than the outer diameter of the circumferential inner wall of the sealing part.

6. A high-sealing pull-ring type inner lid for a polyethylene blow-molded container according to claim 4, characterized in that, A second convex ring (4) is provided at the position of the inner wall of the notch of the sealing part facing the extrusion part, the inner wall of the second convex ring is conical, and the axial end face of the second convex ring is a radial ring surface, and the plane where the radial ring surface is located is in the same plane as the axial end face of the cover edge.

7. A high-sealing pull-ring type inner cap for a polyethylene blow-molded container according to claim 1 or 2 or 3, characterized in that, The sealing part is divided into two parts, namely a conical bottom part and a cylindrical ring part, and there is a fillet transition between the conical bottom part and the cylindrical ring part.

8. A high-sealing pull-ring type inner lid for a polyethylene blow-molded container according to claim 1, characterized in that, The opening member is connected to the edge part of the inner bottom of the sealing part, and the opening member is connected to the inner bottom of the sealing part in an inclined manner.

9. The high-sealing pull-ring type inner cap for a polyethylene blow-molded container according to claim 1 or 8, characterized in that, The opening member includes a connecting part and an opening part, the connecting part is in the shape of a flat strip, the opening part is in the shape of a circular ring, and the overall length of the opening member is less than the diameter of the sealing part.

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