Technical Field
[0001] The present utility model belongs to the technical field of cup lids, in particular
to a negative angle pulp molded cup lid.
Background Art
[0002] A pulp cup lid generally has an opening, which is placed on the top of a pulp cup.
[0003] At present, the existing seal between the lid and the cup is generally formed by
providing a sealing structure on the top of the cup, which can avoid leakage between
the lid and the cup.
[0004] However, the above structure may still have the problem of leakage. Thus, some inventors
have designed a convex sealing structure provided on the inner wall of the cup lid.
This structure not only improves the sealing effect, but also improves the anti-off
feature between the lid and the cup.
[0005] Although it has the above mentioned improvements, its improved solution still has
at least the following deficiencies: after repeated connection and disconnection between
the cup and the lid, the diameter of the lid could be enlarged invisibly; in such
a case, this enlargement can compromise the sealing effect between the cup and the
lid.
Summary of the Utility Model
[0006] In view of the above problems, the object of the present utility model is to provide
a negative angle pulp molded cup lid that can improve sealing performance and structural
strength.
[0007] In order to achieve the above object, the present utility model adopts the following
technical solution: a negative angle pulp molded cup lid is provided, wherein the
cup lid is made of pulp and comprises a top portion and a side portion connected to
an edge of the top portion, an inner wall of the side portion has an inner conical
surface, the inner conical surface forms an angle of less than 90° with a lower surface
of the top portion, and the inner diameter of the inner conical surface gradually
decreases from top to bottom.
[0008] In the negative angle pulp molded cup lid mentioned above, the side portion has an
equal wall thickness.
[0009] In another solution, in the negative angle pulp molded cup lid mentioned above, the
side portion has a wall thickness that gradually increases from top to bottom.
[0010] In the negative angle pulp molded cup lid mentioned above, an outer wall of the side
portion has an outer conical surface symmetrical to the inner conical surface.
[0011] An axis of the inner conical surface coincides with an axis of the outer conical
surface.
[0012] In the negative angle pulp molded cup lid mentioned above, an outer edge of the lower
surface of the top portion is provided with an annular sealing groove, which allows
an opening of a cup to snap therein.
[0013] In the negative angle pulp molded cup lid mentioned above, the rib is parallel to
the top portion.
[0014] In another solution, in the negative angle pulp molded cup lid mentioned above, the
rib is arranged obliquely downward and outward.
[0015] In the negative angle pulp molded cup lid mentioned above, an inner wall of a lower
end of the inner conical surface is provided with an inner convex annular portion.
[0016] In the negative angle pulp molded cup lid mentioned above, the inner convex annular
portion has a circular arc convex surface.
[0017] In the negative angle pulp molded cup lid mentioned above, the thickness of the convex
part of the inner convex annular portion is smaller than the wall thickness of the
conical portion.
[0018] In the negative angle pulp molded cup lid mentioned above, the side portion and the
inner convex annular portion are integrally formed.
[0019] Compared with the prior art, the negative angle pulp molded cup lid of the present
invention has the following advantages:
- 1. The structure is simple and easy to manufacture.
- 2. The designed inner conical surface, which cooperates with the outer convex annular
structure at the upper end of the cup, can achieve the functions of enhancing the
sealing effect and the connecting structure between the cup and the lid, avoiding
the lid's falling off and lid leakage; the design is more reasonable and the structure
is more reliable and stable.
- 3. Through the structure formed by the inner convex annular portion in combination
with the annular sealing groove surface, the present invention can further improve
the structural strength, as well as the reliability of the connection, cooperation
and the sealing effect.
Brief Description of the Drawings
[0020]
FIG. 1 is a schematic view of the structure according to the present utility model.
FIG. 2 is a schematic view of a structure with an inner convex annular portion according
to the present utility model.
FIG. 3 is a schematic view of the structure shown in Example 4 according to the present
utility model.
FIG. 4 is a schematic view of the structure of the outer wall of the side portion
in a vertical state according to the present utility model.
FIG. 5 is a schematic view of the structure of the outer wall of the side portion
in an obliquely outward state according to the present utility model.
FIG. 6 is a schematic view of the state of the utility model after being fitted with
a cup.
[0021] In the above figures, top portion 1, side portion 2, inner conical surface 31, outer
conical surface 32, inner convex annular portion 33, circular arc convex surface 331,
rib 4, circular arc portion 41, annular portion 5
Description of the Embodiments
[0022] The technical solutions of the present utility model will be further described in
detail in reference to the specific embodiments of the present utility model and accompanying
drawings. However, the present utility model is not limited to these embodiments.
Example I
[0023] As shown in FIG. 1 to FIG. 5, for the negative angle pulp molded cup lid, the cup
lid is made of pulp, which includes a top portion 1 and a side portion 2 connected
to an edge of the top portion 1. The top portion 1 and the side portion 2 are made
by pulp injection.
[0024] Specifically, the inner wall of the side portion 2 has an inner conical surface 31
which forms an angle of less than 90° with the lower surface of the top portion 1,
and the inner diameter of the inner conical surface 31 gradually decreases from top
to bottom. The inner conical surface cooperates with the outer convex annular portion
at the upper portion of the cup to achieve the functions of enhancing the sealing
effect and the connecting structure between the cup and the lid, avoiding the lid
falling's off and lid leakage; the design is more reasonable and the structure is
more reliable and stable.
[0025] In an optimized solution, as shown in FIG. 4 to FIG. 6, the side portion 2 has a
wall thickness gradually increasing from top to bottom.
[0026] An annular sealing groove 11 is provided on the outer edge of the lower surface of
the top portion 1 for the cup opening to snap in. The annular sealing groove 11 can
further improve the sealing performance.
[0027] At the end of the side portion 2 away from the top portion 1, a rib that is folded
outward is provided.
[0028] The rib 4 is parallel to the top portion 1.
[0029] In addition, an inner convex annular portion 33 is provided on the inner wall of
the lower end of the inner conical surface 31.
[0030] The inner convex annular portion 33 can further improve the sealing performance.
[0031] The inner convex annular portion 33 has a circular arc convex surface 331.
[0032] The side portion 2 and the inner convex annular portion 33 are integrally formed.
[0033] In this example, the designed inner conical surface 31 achieves a sealing effect
with the cup, and at the same time, it can avoid the issue that the cup lid is detached
upward.
[0034] Secondly, the designed annular sealing groove 11 forms a seal with the cup opening
at the top of the cup, which can further enhance the sealing effect at the connection.
Example II
[0035] As shown in FIG. 1 to FIG. 3,
The structure and principle of this example are basically the same as those of example
1, and thus will not be repeated herein. The difference between them is that the wall
thickness of the side portion 2 is equal in this example.
Example III
[0036] The structure and principle of this example are basically the same as those of example
1, and thus will not be repeated herein. The difference between them is that the rib
4 is arranged obliquely downward and outward.
Example IV
[0037] The structure and principle of this example are basically the same as those of example
1, and thus will not be repeated herein. The difference between them is that an annular
portion 5 is provided at the lower end of the side portion 3.
[0038] The specific embodiments described in the present application are only examples of
the spirit of the present utility model. A person skilled in the art to which the
present utility model belongs can make various modifications or additions to the described
specific embodiments or replace them with similar alternative manners, which do not
deviate from the spirit of the present utility model or go beyond the scope defined
by the appended claims.
1. A negative angle pulp molded cup lid, wherein the cup lid is made of pulp and comprises
a top portion (1) and a side portion (2) connected to an edge of the top portion (1),
characterized in that an inner wall of the side portion (2) has an inner conical surface (31), the inner
conical surface (31) forms an angle of less than 90° with a lower surface of the top
portion (1), and the inner diameter of the inner conical surface (31) gradually decreases
from top to bottom.
2. The negative angle pulp molded cup lid according to claim 1, characterized in that the side portion (2) has an equal wall thickness.
3. The negative angle pulp molded cup lid according to claim 1, characterized in that the side portion (2) has a wall thickness that gradually increases from top to bottom.
4. The negative angle pulp molded cup lid according to claim 1, characterized in that an outer wall of the side portion (2) has an outer conical surface (32) symmetrical
to the inner conical surface (31).
5. The negative angle pulp molded cup lid according to claim 1, characterized in that an outer edge of the lower surface of the top portion (1) is provided with an annular
sealing groove (11), which allows an opening of a cup to snap therein.
6. The negative angle pulp molded cup lid according to claim 1, characterized in that an end of the side portion (2) away from the top portion (1) is provided with a rib
(4) that is folded outward.
7. The negative angle pulp molded cup lid according to claim 6, characterized in that the rib (4) is parallel to the top portion (1).
8. The negative angle pulp molded cup lid according to claim 6, characterized in that the rib (4) is arranged obliquely downward and outward.
9. The negative angle pulp molded cup lid according to claim 1, characterized in that an inner wall of a lower end of the inner conical surface (31) is provided with an
inner convex annular portion (33).
10. The negative angle pulp molded cup lid according to claim 9, characterized in that the side portion (2) and the inner convex annular portion (33) are integrally formed.