Molded pulp cups that can be tightly sealed to the cup body.

Abstract

The present invention discloses a molded pulp cup that can be fastened to a cup body. In particular, a molded pulp molding technique is used to form an integrally molded cup lid. A C-shaped ring receiving chamber is formed inside the cup lid, and convex arc walls are respectively formed on the heads of both ends of the C-shaped ring receiving chamber. The C-shaped ring receiving chamber and the convex arc walls on the heads of both ends of the C-shaped ring receiving chamber fasten and seal the upper edge of the cup body, thereby achieving the effect of fastening and sealing.

Description

Technical Field

[0001] The present invention relates to the field of cup lids, and particularly to a molded pulp cup that can be fastened to a cup body.

Background Art

[0002] Due to the increasing awareness of environmental protection and the well-known aggregation, molded pulp products injection-molded from pulp fiber materials or plant materials have the advantage of being easily recovered and remanufactured and reused, so they have been quickly accepted and adopted by various industries and the general public. Various types of pulp products are gradually replacing various plastic products in life. Regardless of whether it is a bowl, plate, cup lid, straw, packaging material, cushioning material, etc., molded pulp products are gradually replacing plastic products. Although the material of molded pulp products has changed from plastic to pulp, in the process of molding the pulp mold, various shapes cannot be easily molded as well-known in the industry like plastic products. Therefore, when forming many products or after forming, the effects or performances of plastic products cannot be exerted. However, the pulp mold industry has just started and still has great room for progress and development. As one of the most commonly seen consumables in daily life, the requirements for cup lids in use are particularly strict. As a container body, cup lids require not only food-grade materials and hygienic conditions, but also better sealing performance and higher safety.

Summary of the Invention

Problems to be Solved by the Invention

[0003] As shown in Figures 5 and 6, conventional molded pulp cup lids 3, due to limitations in molding conditions and materials, have airtightness that is far inferior to that of plastic cup lids. When conventional molded pulp cup lids 3 are molded, the engaging part 31 that latches onto the cup body 4 is made by a negative-angle recess, an inwardly sloping wall, or various geometric methods. However, when tightening the outer hoop 41 of the cup body 4, the dimensions do not match perfectly, so the cup lid 3 easily comes off or cannot be completely sealed, causing the liquid inside the cup body 4 to leak out or overflow. Conventional molded pulp cup lids 3 generally only consider the latching method for the engaging part 31, and do not consider its strength. If strength is considered, an optimal latching force cannot be obtained, and conventional molded pulp cup lids 3 are easily deformed by the influence of the outer hoop 41 of the cup body 4, and the conventional cup lids 3 easily fall off when subjected to external force. As a result, satisfactory airtightness and safety could not be achieved. [Means for solving the problem]

[0004] The main object of the present invention is to provide a molded pulp cup that can be tightened to a cup body, in which a cup lid is formed integrally using pulp molding technology, a C-shaped ring receiving chamber is formed on the inside of the cup lid, and convex arc walls are provided on both ends of the C-shaped ring receiving chamber, and the C-shaped ring receiving chamber and the convex arc walls at both ends of the C-shaped ring receiving chamber tighten and seal an outer hoop formed on the upper edge of the cup body, thereby achieving the effect of fastening and sealing. Another object of the present invention is to provide a molded pulp cup that can be fastened to a cup body, wherein the inside of the cup lid simultaneously fastens and seals the outer and inner surfaces of the upper edge of the cup body, the convex arc wall at one end of the C-shaped ring housing tank is capable of contacting the outer surface of the upper edge of the cup body, the convex arc wall at the other end of the C-shaped ring housing tank is capable of contacting the inner surface of the upper edge of the cup body, and the cup lid simultaneously fastens the outer and inner surfaces of the upper edge of the cup body, thereby achieving the effect of fastening and sealing.

[0005] To achieve the above-mentioned objectives, the present invention provides a molded pulp cup that can be tightened onto a cup body, the cup lid having a central sealing surface, an annular side wall extending downward from the outer edge of the central sealing surface, an annular expansion flange extending horizontally from the end of the annular side wall, the annular expansion flange being bent and extended in an arc shape to form a vertically downward annular lower side wall, a C-shaped ring housing compartment being formed on the inner surface of the arc-shaped bent portion between the annular expansion flange and the annular lower side wall of the cup lid, and convex arc walls being provided at both ends of the C-shaped ring housing compartment.

[0006] Furthermore, the cup lid is integrally molded using pulp fiber material and pulp molding technology.

[0007] Furthermore, the aforementioned convex arc walls are a first convex arc wall and a second convex arc wall, and near one end of the C-shaped ring housing tank of the annular side wall, the aforementioned first convex arc wall is provided on the inner surface of the annular expansion flange, and at the other end of the C-shaped ring housing tank, the second convex arc wall is provided on the inner surface of the annular lower side wall, and the upper edge of the cup body can be tightened and sealed via the C-shaped ring housing tank and the first and second convex arc walls at both ends of the C-shaped ring housing tank.

[0008] Furthermore, the central point C of the aforementioned C-shaped ring storage tank has a vertical line V extending in the Z-axis direction, a horizontal line E extending in the X-axis direction, the outermost vertex of the first convex arc wall is vertex P, the outermost vertex of the second convex arc wall is vertex Q, the line connecting vertex P of the first convex arc wall and the central point C of the C-shaped ring storage tank is connecting line L, and the line connecting vertex Q of the second convex arc wall and the central point C of the C-shaped ring storage tank is connecting line K. With the central point C of the C-shaped ring storage tank as the reference point, the angle θ formed by connecting line L and connecting line K is less than 180 degrees, an outer hoop is formed on the upper edge of the cup body which is connected to the cup lid, the cup lid is fitted onto the upper edge of the cup body to form a horn shape and the outer hoop is tightened inside the C-shaped ring storage tank.

[0009] Furthermore, a central axis is provided in the center of the central sealing surface of the cup lid, a horizontal line G extends in the X-axis direction from the outer surface of the highest point of the central sealing surface, the outermost point of the first convex arc wall is vertex P, the outermost point of the second convex arc wall is vertex Q, the vertical distance from the horizontal line G extending from the outer surface of the highest point of the central sealing surface to the outermost point P of the first convex arc wall is distance A, the vertical distance from the horizontal line G extending from the outer surface of the highest point of the central sealing surface to the outermost point Q of the second convex arc wall is distance B, and vertical distance A is smaller than vertical distance B, the horizontal distance from the central axis U of the central sealing surface to the outermost point P of the first convex arc wall is distance M, and the horizontal distance from the central axis U of the central sealing surface to the outermost point Q of the second convex arc wall is distance N, and horizontal distance M is smaller than horizontal distance N.

[0010] Furthermore, when the cup lid is attached to the cup body, an outer hoop formed by rolling up a thin piece is formed on the upper edge of the cup body. When the outer hoop of the cup body and the C-shaped ring housing of the cup lid are attached, the aforementioned second convex arc wall is located on the outer surface of the outer hoop of the cup body, and the diameter decreases toward the inside. A first external force is generated when the first convex arc wall contacts the outer surface of the outer hoop of the cup body, and a second external force is generated when the first convex arc wall contacts the inner surface of the outer hoop of the cup body. There is a distance difference between the first and second convex arc walls, and the first and second convex arc walls simultaneously generate forces acting on the inner and outer surfaces of the outer hoop of the cup body. As a result, the structural design of the first and second convex arc walls increases the strength of the cup lid, preventing it from easily deforming under the influence of external forces, and preventing the connection between the cup lid and the cup body from easily becoming loose.

[0011] After employing the means described above, the molded pulp cup lid of the tightenable cup body of the present invention is formed as an integrally molded cup lid by molded pulp molding technology, a C-shaped ring storage compartment is formed on the inner surface of the arc-shaped folded portion between the annular expansion flange and the annular lower side wall of the cup lid, a first convex arc wall is provided on the inner surface of the annular expansion flange near one end of the C-shaped ring storage compartment on the annular side wall, and a second convex arc wall is provided on the inner surface of the annular lower side wall at the other end of the C-shaped ring storage compartment, and the C-shaped ring storage compartment and the first and second convex arc walls at both ends of the C-shaped ring storage compartment tighten and seal the upper edge of the cup body, thereby achieving the effects of fastening and sealing. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a cross-sectional view of the cup lid of the present invention. [Figure 2] Figure 2 is a cross-sectional view showing the cup lid and cup body of the present invention joined together. [Figure 3] Figure 3 is a magnified view of a portion of Figure 2. [Figure 4] Figure 4 is a semi-sectional view of Figure 1. [Figure 5] Figure 5 shows a general format of a conventional cup lid. [Figure 6] Figure 6 shows a general format of a conventional cup lid. [Modes for carrying out the invention]

[0013] To further illustrate the technical means of the present invention, the present invention will be described in detail below with reference to specific examples.

[0014] To enable examiners to understand the specific structure of the present invention in more detail, as shown in Figures 1 to 3, the molded pulp cup lid 1 of the tightenable cup body 2 provided by the present invention is formed integrally by pulp molding technology using pulp fiber material. The cup lid 1 is provided with a central sealing surface 10, and an annular side wall 11 extending downward is provided on the outer edge of the central sealing surface 10. An annular expansion flange 12 is provided at the end of the annular side wall 11, spreading out in the horizontal direction. The annular expansion flange 12 is bent and extended in an arc shape to form a vertically downward annular lower side wall 13. A C-shaped ring housing tank 14 is formed on the inner surface of the arc-shaped bent portion between the annular expansion flange 12 and the annular lower side wall 13 of the cup lid 1. Convex arc walls are provided at both ends of the C-shaped ring housing tank 14, which are the first convex arc wall 15 and the second convex arc wall 16, respectively. Near one end of the C-shaped ring storage tank 14 on the annular side wall 11, the aforementioned first convex arc wall 15 is provided on the inner surface of the annular expansion flange 12. At the other end of the C-shaped ring storage tank 14, the aforementioned second convex arc wall 16 is provided on the inner surface of the annular lower side wall 13, and the upper edge of the cup body 2 is tightened and sealed via the C-shaped ring storage tank 14 and the first and second convex arc walls 15 and 16 at both ends of the C-shaped ring storage tank 14.

[0015] As explained in Figure 3 based on the directions and three-dimensional spatial coordinates, the central point C of the aforementioned C-shaped ring storage tank 14 is connected to a vertical perpendicular line V in the Z-axis direction. The central point C of the C-shaped ring storage tank 14 is connected to a horizontal line E in the X-axis direction. The outermost vertex of the first convex arc wall 15 is vertex P, and the outermost vertex of the second convex arc wall 16 is vertex Q. The line connecting vertex P of the first convex arc wall 15 and the central point C of the C-shaped ring storage tank 14 is connecting line L, and the line connecting vertex Q of the second convex arc wall 16 and the central point C of the C-shaped ring storage tank 14 is connecting line K. With the central point C of the C-shaped ring storage tank 14 as the reference point, the angle θ formed by connecting line L and connecting line K is less than 180 degrees, and the outer hoop 21 is formed in a horn shape and tightened inside the C-shaped ring storage tank 14, thus achieving the effect of fastening and sealing.

[0016] Based on the directions and three-dimensional spatial coordinates shown in Figure 4, a central axis U is provided at the center of the central sealing surface 10 of the cup lid 1, and a horizontal line G extends in the X-axis direction from the outer surface of the highest point of the central sealing surface 10. The vertical distance from the horizontal line G extending from the outer surface of the highest point of the central sealing surface 10 to the outermost point P of the first convex arc wall 15 is distance A. The vertical distance from the horizontal line G extending from the outer surface of the highest point of the central sealing surface 10 to the outermost point Q of the second convex arc wall 16 is distance B. Vertical distance A is smaller than vertical distance B. The horizontal distance from the central axis U of the central sealing surface 10 to the outermost point P of the first convex arc wall 15 is distance M. The horizontal distance from the central axis U of the central sealing surface 10 to the outermost point Q of the second convex arc wall 16 is distance N. Horizontal distance M is smaller than horizontal distance N.

[0017] When the cup lid 1 is fitted onto the cup body 2 from top to bottom, the annular lower wall 13 and the second convex arc wall 16 of the cup lid 1 come into contact with the cup body 2 in sequence and are fitted downwards. The upper edge of the cup body 2 of the present invention is an outer hoop 21 formed by rolling up a thin piece, as described in the embodiment shown in Figure 3. The outer hoop 21 of the cup body 2 deforms slightly when compressed by the second convex arc wall 16 of the cup lid 1. The outer hoop 21 continues along the surface of the second convex arc wall 16 and along the inner surface of the cup lid 1 to the C-shaped ring housing tank 14, and when the outer hoop 21 of the cup body 2 is completely housed in the C-shaped ring housing tank 14, it is tightly fitted and there are no gaps. The first convex arc wall 15 of the cup lid 1 comes into contact with the inner surface 22 of the outer hoop 21 of the cup body 2. The second convex arc wall 16 of the cup lid 1 comes into contact with the outer surface 23 of the outer hoop 21 of the cup body 2. Refer to Figures 2 to 4 simultaneously. When the outer hoop 21 of the cup body 2 and the C-shaped ring housing chamber 14 of the cup lid 1 are connected, the second convex arc wall 16 is positioned on the outer surface 23 of the outer hoop 21 of the cup body 2, and the diameter decreases toward the inside. At the same time, a first external force F1 is generated when it comes into contact with the outer surface 23 of the outer hoop 21 of the cup body 2. A second external force F2 is generated when the first convex arc wall 15 comes into contact with the inner surface 22 of the outer hoop 21 of the cup body 2. That is, there is a distance difference between the first convex arc wall 15 and the second convex arc wall 16. Since the first convex arc wall 15 and the second convex arc wall 16 simultaneously generate forces acting on the inner surface 22 and outer surface 23 of the outer hoop 21 of the cup body 2, the structural design of the first convex arc wall 15 and the second convex arc wall 16 increases the strength of the cup lid 1, preventing deformation even when affected by external forces, and achieving fastening and sealing effects.

[0018] Briefly speaking, the molded pulp cup lid 1 of the closable cup body 2 provided by the present invention is integrally formed by the molded pulp forming technology on the cup lid 1. An inner surface of an arcuately bent portion between an annular extended flange 12 and an annular lower side wall 13 of the cup lid 1 forms a C-shaped ring accommodating groove 14. A first convex arc wall 15 is convexly provided on an inner surface of the annular extended flange 12 near one end of the C-shaped ring accommodating groove 14 of the annular side wall 11. A second convex arc wall 16 is convexly provided on an inner surface of the annular lower side wall 13 at the other end of the C-shaped ring accommodating groove 14. The C-shaped ring accommodating groove 14, the first convex arc wall 15 and the second convex arc wall 16 at both ends of the C-shaped ring accommodating groove 14 can clamp and seal the upper edge of the cup body 2, achieving the effect of fastening and sealing.

Explanation of Reference Signs

[0019] 1 Cup lid 10 Central sealing surface 11 Annular side wall 12 Annular extended flange 13 Annular lower side wall 14 C-shaped ring accommodating groove 15 First convex arc wall 16 Second convex arc wall 2 Cup body 21 Outer hoop 22 Inner surface 23 Outer surface 3 Cup lid 31 Engaging portion 4 Cup body 41 Outer hoop C Central point V Vertical line E Horizontal line P Vertex Q Vertex L Connection line K Connection line θ Angle U Central axis G Horizontal line A Distance B Distance M Distance N Distance F1 First external force F2 First external force

Claims

1. A molded pulp cup that can be fastened to a cup body, wherein the upper edge of the cup body has an outer hoop formed by rolling up a thin piece, the cup lid has a central sealing surface, the outer edge of the central sealing surface has an annular side wall extending downward, the end of the annular side wall has an annular expansion flange that spreads out in the horizontal direction, the annular expansion flange is bent and extended in an arc shape to form a vertically downward annular lower side wall, a C-shaped ring housing tank is formed on the inner surface of the arc-shaped bent portion between the annular expansion flange and the annular lower side wall of the cup lid, and convex arc walls are provided at both ends of the C-shaped ring housing tank, the cup lid fastens the outer hoop of the cup body to achieve a sealing effect. Each of the aforementioned convex arc walls is a first convex arc wall and a second convex arc wall, and the first convex arc wall is provided protruding from the inner surface of the annular expansion flange near one end of the C-shaped ring housing tank on the annular side wall, and the second convex arc wall is provided protruding from the inner surface of the annular lower side wall at the other end of the C-shaped ring housing tank, and the upper edge of the cup body is tightened and sealed via the C-shaped ring housing tank and the first and second convex arc walls at both ends of the C-shaped ring housing tank. A molded pulp cup that can be tightened into a cup body, characterized in that when the outer hoop of the cup body is completely housed in the C-shaped ring housing, the inner surface of the C-shaped ring housing, which extends between the first convex arc wall and the second convex arc wall, is in overall contact with the outer hoop of the cup body, and they are tightly fitted together so that there is no gap between the outer hoop and the C-shaped ring housing, and the first convex arc wall, including its outermost vertex portion, abuts against the inner surface of the outer hoop of the cup body, and the second convex arc wall abuts against the outer surface of the outer hoop of the cup body.

2. The molded pulp cup according to claim 1, characterized in that the cup lid is integrally molded using pulp fiber material by pulp molding technology.

3. The molded pulp cup that can be fastened to a cup body according to claim 1, characterized in that, with respect to the center point C of the C-shaped ring storage tank, a vertical perpendicular V extends in the Z-axis direction from the center point C of the C-shaped ring storage tank, a horizontal line E extends in the X-axis direction from the center point C of the C-shaped ring storage tank, the outermost vertex of the first convex arc wall is vertex P, the outermost vertex of the second convex arc wall is vertex Q, the line connecting vertex P of the first convex arc wall and the center point C of the C-shaped ring storage tank is connecting line L, the line connecting vertex Q of the second convex arc wall and the center point C of the C-shaped ring storage tank is connecting line K, and with respect to the center point C of the C-shaped ring storage tank, the angle θ formed by the connecting line L and the connecting line K is less than 180 degrees, and the outer hoop is formed in an angular shape so that it can be fastened to the cup body according to claim 1.

4. A molded pulp cup that can be tightened to a cup body according to claim 1, characterized in that a central axis U is provided at the center of the central sealing surface of the cup lid, a horizontal line G extends in the X-axis direction from the outer surface of the highest point of the central sealing surface, the outermost point of the first convex arc wall is point P, the outermost point of the second convex arc wall is point Q, the vertical distance from the horizontal line G extending from the outer surface of the highest point of the central sealing surface to the outermost point P of the first convex arc wall is distance A, the vertical distance from the horizontal line G extending from the outer surface of the highest point of the central sealing surface to the outermost point Q of the second convex arc wall is distance B, vertical distance A is smaller than vertical distance B, the horizontal distance from the central axis U of the central sealing surface to the outermost point P of the first convex arc wall is distance M, the horizontal distance from the central axis U of the central sealing surface to the outermost point Q of the second convex arc wall is distance N, and horizontal distance M is smaller than horizontal distance N

5. A molded pulp cup that can be tightened to a cup body, characterized in that when the cup lid is attached to the cup body, the outer hoop of the cup body and the C-shaped ring housing of the cup lid are attached, the second convex arc wall is located on the outer surface of the outer hoop of the cup body and the diameter decreases toward the inside, and a first external force is generated when it comes into contact with the outer surface of the outer hoop of the cup body, a second external force is generated when the first convex arc wall comes into contact with the inner surface of the outer hoop of the cup body, there is a distance between the first convex arc wall and the second convex arc wall, and the first convex arc wall and the second convex arc wall simultaneously generate forces acting on the inner surface and the outer surface of the outer hoop of the cup body, as described in claim 4.

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