TWM600693U - Mold assembly for plastic cup lid - Google Patents

Abstract

A mold assembly for a plastic cup lid includes a first mold, a second mold, and a third mold that are controlled by mechanical power and can be closed and separated; the first mold includes a cavity, and the second mold The mold is an annular mold, and the third mold includes a convex mold; the second mold is located between the first mold and the third mold. The mold assembly is used for injection molding a plastic cup cover, the plastic cup cover has a cover top, an annular side wall, a positioning ring, an extension piece and a buckle piece.

Description

Mold assembly for plastic cup lid

This creation is related to the cup lid, and more specifically, it refers to a structure that makes the plastic cup lid and the cup mouth more stable. Furthermore, this creation is about the mold for making the plastic cup lid.

As shown in Fig. 1 and Fig. 2, the conventional injection-molded plastic cup cover 10 includes a cover top 11, a ring-shaped side wall 12 is formed on the circumference of the cover top 11, and a positioning ring 13 is formed on the bottom edge of the ring-shaped side wall 12, The bottom edge of the positioning ring 13 is formed with three extension pieces 14, and each extension piece 14 is formed with a buckle piece 15 that can be slightly elastically movable toward the center of the cup cover 10. The outside surface of the movable end of the buckle piece 15 is more Molding a bump 16.

The lid 10 is combined with the mouth of the paper cup, and the positioning ring 13 is sleeved on the outside of the curling edge of the mouth of the paper cup. A slight physical deformation between the two creates a fitting relationship. However, this fitting relationship is not very stable. Therefore, it is necessary to press the three buckle pieces 15 inward so that the movable ends and the convex points 16 are locked under the curling edge of the cup opening, so that the cup lid 10 and the cup opening Obtain a more stable positioning. This type of cup lid 10 usually provides a sipping opening 17, so when drinking a drink in the glass, the lid 10 does not need to be removed.

As shown in FIGS. 3 to 5, the injection molding mold assembly of the cup cover 10 is disclosed, including a first mold 21, a second mold 22, a third mold 23, and several fourth molds 24 (mold sliders) , The first mold 21 is a female mold, the second mold 22 is an annular mold, the third mold 23 is a male mold, and the fourth mold 24 (mold slider) is a block mold. The second mold 22 is between the first mold 21 and the third mold 23, The convex mold 231 of the third mold 23 can pass through the inner ring space 221 of the second mold 22 and then be combined with the cavity 211 of the first mold 21. The fourth mold 24 (mold slider) is located between the first mold 21 and the second mold 22. A plurality of preset first wedge grooves 25 and second wedge grooves 26 are arranged radially. Complementary concave and convex shapes are arranged between the molds according to the structure of the cup cover 10. The fourth mold 24 (mold slider) is provided with a concave shape 241 corresponding to the buckle piece 15 and the convex point 16 of the cup cover 10 toward the center of the mold assembly. All molds are controlled by mechanical power and can be moved back. The first mold 21, the second mold 22, and the third mold 23 form the top 11, the annular side wall 12, the positioning ring 13, and the extension piece 14 of the cup lid 10. The fourth mold 24 (mold slider) forms the card Clas 15 and bumps 16.

As shown in Figure 6, the closed-mold appearance of the mold assembly, in which the cup lid is injection molded.

As shown in Fig. 7, the first mold 21 is removed to show that the cup cover 10 is formed in the mold assembly.

Both the lid 10 and the mold of the prior art disclosed by the above mentioned need to be improved. Regarding the cup lid 10, the extension piece 14 and the buckle piece 15 are both very thin sheet-like plastic structures, and the structure of the part where the buckle piece 15 and the extension piece 14 are connected appears fragile and is easily deformed by the temperature of the beverage in the cup. It is more likely to break during the capping. Regarding the mold assembly, there are a total of six molds, the quantity is large, the mold opening cost is high, the mold closing accuracy is not easy to control, the time required for mold closing and mold opening increases, the process time of the cup lid 10 is increased, and the cup lid 10 is formed The defect rate increased instead.

To solve the above problems, this creation proposes an improved cup lid mold.

Technical features of this creation:

A mold assembly of a plastic cup lid, the mold assembly is used for injection molding a plastic cup lid; the plastic cup lid includes a lid, the circumference of the lid forms an annular side wall, the annular side wall A positioning ring is formed on the bottom edge of the positioning ring, and at least one extension piece is formed on the bottom edge of the positioning ring. A buckle piece that can be slightly elastically moved toward the center of the cup cover is formed in the extension piece, and a movable end of the buckle piece A convex point is formed on the outer surface; the mold assembly includes a first mold, a second mold, and a third mold that are controlled by mechanical power and can be closed and separated; the first mold includes a cavity, the The second mold is an annular mold, and the third mold includes a convex mold; the second mold is located between the first mold and the third mold; and is characterized in that:

At least one buckle module is protruded radially on the circumferential side of the punch of the third mold; the buckle module includes a backing portion and an embedding portion connected along the axial direction of the third mold. The lining part and the embedding part have a significant height difference, and a drop surface formed by the height difference faces the first mold;

The second mold faces the first mold with a second mold surface, the second mold surface is axially recessed with at least one wedge-shaped groove, and an annular inner wall of the second mold is provided with a sliding groove to communicate with the wedge-shaped groove ；

In the first mold, a first mold surface faces the second mold surface of the second mold. The first mold surface axially protrudes at least one wedge block, and the inner surface of the wedge block has an inner surface corresponding to the plastic cup cover A shallow concave shape of the buckle piece and the convex point;

The embedding portion of the buckle module enters the sliding groove of the second mold, the punch protrudes from the second mold toward the first mold, and the backing portion of the buckle module corresponds to the second mold The wedge-shaped groove of the mold;

The third mold protrudes from the second mold and the convex mold is aligned with the mold cavity of the first mold, the top of the cup lid, the annular side wall, the positioning ring are in the mold cavity and the convex Forming between molds;

The first mold surface of the first mold is aligned with the second mold surface of the second mold, and the first mold The wedge-shaped block of a mold is aligned with the wedge-shaped groove of the second mold, the extension piece of the cup cover is formed between the wedge-shaped groove and the wedge-shaped block; the shallow concave shape of the first mold is aligned with the third The lining part of the mold and the buckle piece of the cup cover are formed between the shallow concave shape and the lining part.

The effect of this creation:

Compared with the mold assembly of the prior art, this creative mold assembly saves the fourth mold of the prior art, and the fourth mold (mold slider) of the prior art is more difficult to control in the mold assembly and constitutes the finished cup lid. The main reason for the increase in defect rate is that this creation can reduce the defect rate of the finished cup lid by eliminating the fourth mold (mold slider), and this creation uses three molds to complete the basic shape of the cup lid, two extension pieces and cards For clasps, compared with the previous technology, the number of modules is reduced, the cost of opening molds is reduced, the accuracy of mold closing is easy to control, the time required for mold closing and opening is reduced, the process time of cup lids is shortened, and the stability of mold opening and closing control is increased It can reduce the defect rate of the finished cup lid.

The mold assembly of the prior art has a total of six molds. The opening and closing actions include the first mold, the second mold and the third mold that move axially, and the fourth mold (mold slider) that moves radially. The movement of the mold includes the axial direction and the radial direction. The directionality is complicated, and the first mold, the second mold and the third mold must be clamped in the axial direction before the fourth mold (mold slider) can be continued. The radial mold clamping action increases the difficulty of opening and closing the mold, the time required for the cup lid manufacturing process increases, and the molding defect rate of the cup lid is higher. However, this creation completes the basic structure of the cup lid, the extension piece and the buckle piece with three molds (the first mold, the second mold, and the third mold) with one-time axial mold clamping and mold opening actions. The mold is simplified , High efficiency, easy control, and improved accuracy.

[Prior Art]

10: Cup lid

11: cap

12: Ring sidewall

13: positioning ring

14: Extension piece

15: buckle piece

16: bump

17: Sip open

21: The first mold

211: Mould Cavity

22: The second mold

221: Inner Ring Space

23: The third mold

231: Punch

24: Fourth mold

241: concave

25: The first wedge groove

26: second wedge groove

[This creation]

30: Plastic Cup Lid

31: cap

32: ring side wall

33: positioning ring

34: Extension piece

35: buckle piece

351: Bottom

36: bump

37: Reinforcement Department

38: Sip opening

40: paper cup mouth

41: Curl Edge

50: The first mold

51: Mould cavity

52: Wedge block

53: shallow concave

54: Deep concave

55: The first die surface

60: The second mold

61: wedge groove

62: Chute

63: The second die surface

64: Ring inner wall

70: The third mold

71: Punch

72: buckle module

73: set off

74: Embedding part

76: drop side

[Figure 1] A three-dimensional view of a conventional plastic cup lid.

[Figure 2] is an enlarged view of the circle in Figure 1.

[Figure 3] is an exploded view of the conventional mold assembly from the first perspective.

[Figure 4] is a second perspective exploded view of the conventional mold assembly.

[Figure 5] is a perspective view of the fourth mold of the conventional mold assembly.

[Figure 6] is an appearance view of the conventional mold assembly.

[FIG. 7] The first mold of FIG. 6 is removed to show that the conventional cup cover is formed in the conventional mold assembly.

[Figure 8] The top three-dimensional appearance of the creative cup lid.

[Figure 9] is an enlarged view of the circled part in Figure 8.

[Figure 10] The bottom three-dimensional appearance of the creative cup lid.

[Figure 11] An exploded view of the lid and mouth of the cup.

[Figure 12] This is a combined drawing of the lid and the mouth of the paper cup.

[Figure 13] The first perspective exploded view of the creative mold assembly.

[Figure 14] The second perspective exploded view of the creative mold assembly.

[Figure 15] The three-dimensional appearance of the third mold of this creation.

[Figure 16] The side view of the third mold of this creation.

[Figure 17] The three-dimensional appearance of the second mold of this creation.

[Figure 18] A cross-sectional view of the second mold of this creation.

[Figure 19] The three-dimensional appearance of the first mold of this creation.

[Figure 20] A cross-sectional view of the first mold of this creation.

[Figure 21] The combined appearance of the second mold and the third mold of this creation.

[Figure 22] A cross-sectional view of the second mold and the third mold of this creation.

[Figure 23] The closed-mold appearance of the creative mold assembly.

[Figure 24] A cross-sectional view of the mold assembly of this creation.

[Figure 25] The first mold in Figure 24 is removed to show that the creative cup cover is formed in the creative mold assembly.

[Figure 26] is an enlarged schematic view of circle B in Figure 25.

In order to facilitate the description of the central idea of the creation in the column of the above-mentioned new content, specific examples are used to express it. The various objects in the embodiment are drawn according to the proportion, size, deformation or displacement suitable for explanation, rather than drawn according to the proportion of the actual element, which will be described first. In the following description, similar components are represented by the same number, and most of the same components are represented by only one number.

As shown in Figs. 8-10, the plastic cup lid 30 of the present invention is injection-molded and includes a lid 31. The circumference of the lid 31 is formed with an annular side wall 32, and the bottom edge of the annular side wall 32 is formed with a positioning ring 33. The bottom edge of the positioning ring 33 is formed with two extension pieces 34, and each extension piece 34 is formed with a buckle piece 35 that can be slightly elastically movable toward the center of the cup cover 30. The outside surface of the movable end of the buckle piece 35 is more Molding a bump 36. The connection between the buckle piece 35 and the extension piece 34 has a reinforcing portion 37 with an increased structural thickness. Preferably, the reinforcing portion 37 extends to the bottom edge 351 of the buckle piece 35.

11 to 12, the cup lid 30 is combined with the paper cup mouth 40, and the positioning ring 33 is sleeved on the outside of the curling edge 41 of the paper cup mouth 40, and a slight physical deformation between the two produces a fitting relationship. The two buckle pieces 35 are pressed inward, so that the movable ends and the convex points 36 are clamped under the curling edge 41 of the cup opening, so that the cup cover 30 and the cup opening can be positioned more firmly. The cup cover 30 provides a sipping opening 38, so when drinking a drink in the cup, the cup cover 30 does not need to be removed.

The creative cup cover 30 improves the problems disclosed in the prior art. Based on the extension piece 34 and the buckle piece 35 are both thin sheet-like plastic structures, the original creation is set at the connection between the buckle piece 35 and the extension piece 34 The reinforcing portion 37 is extended, and the reinforcing portion 37 extends to the bottom edge 351 of the buckle piece 35. Accordingly, the structural strength of the bottom edge 351 of the extension piece 34 and its connection with the buckle piece 35 is increased, and the buckle is reduced The probability of deformation or breakage of the sheet 35 and the extension sheet 34. Especially when the cup lid 30 is combined with the paper cup mouth 40, the pressing force from top to bottom makes the prior art buckle piece 35 easy to be squeezed inward when passing through the curling edge 41 of the paper cup mouth 40, so that the buckle piece 35 deforms, but with the reinforcing part 37 of this creation, the extension piece 34 can resist the downward pressing force and avoid being squeezed inward, while maintaining the shape of the buckle piece 35 and the extension piece 34 and the cup opening 40 The fit and card system.

As shown in FIG. 13 to FIG. 14, the injection molding mold assembly of the cup cover 30 of the present invention includes a first mold 50, a second mold 60, and a third mold 70. All molds are controlled by mechanical power and can be moved back and tightened. The first mold 50 is a female mold, the second mold 60 is a ring mold, and the third mold 70 is a male mold. The second mold 60 is interposed between the first mold 50 and the third mold 70, and the convex mold 71 of the third mold 70 can pass through the second mold 60 and then be combined with the cavity 51 of the first mold 50. The first mold 50, the second mold 60 and the third mold 70 form the top 31, the annular side wall 32, the positioning ring 33, the extension piece 34, the sipping opening 38, and the top 31 of the creative cup lid 30. Pattern, text.

As shown in Figures 15 and 16, the third mold 70 of the present creation has a stepped buckle module 72 radially protruding from the circumferential mold side of its punch 71 at a relative position of 180 degrees. The buckle module 72 includes a backing portion 73 and an embedding portion 74 that are connected along the axial direction of the third mold 70. The backing portion 73 and the embedding portion 74 have a significant difference in height and are formed by the difference in height A drop surface 76 faces the first mold 50.

As shown in Figure 17 and Figure 18, the second mold 60 of the present creation has a second mold surface 63 facing the first mold. A mold 50, the second mold surface 63 is axially recessed with a wedge groove 61 at a relative position of one hundred and eighty degrees, and the annular inner wall 64 of the second mold 60 is provided with a sliding groove 62 and the wedge groove 61 Connected, the outline shape and size of the sliding groove 62 are complementary to the embedding portion 74 of the buckle module 72.

As shown in Figures 19 and 20, the first mold 50 of the present creation has a first mold surface 55 facing the second mold 60, and the first mold surface 55 is protruded with a wedge shape in each axial direction at a relative position of 180 degrees. The inner surface of the wedge-shaped block 52 has a shallow concave shape 53 corresponding to the buckle piece 35, the convex point 36, and the reinforcing portion 37 of the cup cover 30, and the wedge-shaped block 52 further includes the shallow concave shape 53 provided on both sides of the shallow concave shape 53 Deep concave 54.

As shown in Figure 21 and Figure 22, a schematic diagram of the clamping of the second mold 60 and the third mold 70 of the present creation. The embedding portion 74 of the buckle module 72 of the third mold 70 enters the chute 62 of the second mold 60, thereby restricting the second mold 60 so as not to rotate, and the convex mold 71 of the third mold 70 is removed from the second mold 60. The mold 60 protrudes, and the backing portion 73 of the buckle module 72 corresponds to the wedge groove 61 of the second mold 60.

As shown in Figure 23 and Figure 24, a schematic diagram of the clamping of the second mold 60 and the third mold 70 of the present creation. The third mold 70 protrudes from the convex mold 71 of the second mold 60 to be aligned with the cavity 51 of the first mold 50, and the first mold surface 55 of the first mold 50 is opposed to the second mold surface 63 of the second mold 60 Close, the wedge block 52 of the first mold 50 is aligned with the wedge groove 61 of the second mold 60, and the shallow recess 53 of the first mold 50 is aligned with the backing portion 73 of the third mold 70.

The mold assembly of this creation is tightly closed by mechanical force, the molten plastic is injected into the mold cavity and after cooling is completed, the mold is opened and the finished cup lid 30 is taken out.

As shown in FIGS. 25 and 26, in order to understand the state of the cup cover 30 being formed in the mold, the first mold 50 is removed to illustrate the schematic view of the cup cover 30 being formed in the mold assembly. The top 31 of the cup lid 30, the annular side wall 32, and the positioning ring 33 are formed between the cavity 51 and the convex mold 71 of the first mold 50 and the third mold 70. The extension piece 34 of the cup lid 30 is formed in the first mold. 50 and the wedge groove 61 of the second mold 60 and The wedges 52 are formed between the buckle pieces 35 and the reinforcing part 37 of the cup cover 30 are formed between the dimple 53 and the backing part 73 of the first mold 50 and the third mold 70.

Compared with the mold assembly of the prior art, this creative mold assembly saves the fourth mold of the prior art, and the fourth mold of the prior art is more difficult to control in the mold assembly and the defect rate of the finished product of the lid 30 is increased. The main reason for this creation is that the elimination of the fourth mold can reduce the defect rate of the finished cup lid 30, and the basic shape of the cup lid 30, the two extension pieces 34 and the buckle piece 35 are completed with three molds. In the prior art, the number of modules is reduced, the cost of mold opening is reduced, the accuracy of mold closing is easy to control, the time required for mold closing and opening is reduced, the process time of the cup lid 30 is shortened, the stability of mold opening and closing control is increased, and the cup is reduced. Cover the defect rate of 30 finished products.

50: The first mold

60: The second mold

61: wedge groove

62: Chute

63: The second die surface

64: Ring inner wall

70: The third mold

71: Punch

72: buckle module

73: set off

74: Embedding part

76: drop side

Claims (4)

A mold assembly of a plastic cup lid, the mold assembly is used for injection molding a plastic cup lid; the plastic cup lid includes a lid, the circumference of the lid forms an annular side wall, and the bottom edge of the annular side wall is formed A positioning ring, at least one extension piece is formed on the bottom edge of the positioning ring, and a buckle piece capable of slightly elastic movement toward the center of the cup cover is formed in the extension piece, and a movable end outer surface of the buckle piece is formed with a Bumps; the mold assembly includes a first mold, a second mold, and a third mold that are controlled by mechanical power and can be closed and separated; the first mold includes a cavity, and the second mold is An annular mold, the third mold includes a convex mold; the second mold is located between the first mold and the third mold, and is characterized in that: At least one buckle module is protruded radially on the circumferential side of the punch of the third mold; the buckle module includes a backing portion and an embedding portion connected along the axial direction of the third mold. The lining part and the embedding part have a significant height difference, and a drop surface formed by the height difference faces the first mold; The second mold faces the first mold with a second mold surface, the second mold surface is axially recessed with at least one wedge-shaped groove, and an annular inner wall of the second mold is provided with a sliding groove to communicate with the wedge-shaped groove ； In the first mold, a first mold surface faces the second mold surface of the second mold. The first mold surface axially protrudes at least one wedge block, and the inner surface of the wedge block has an inner surface corresponding to the plastic cup cover A shallow concave shape of the buckle piece and the convex point; The embedding portion of the buckle module enters the sliding groove of the second mold, the punch protrudes from the second mold toward the first mold, and the backing portion of the buckle module corresponds to the second mold The wedge-shaped groove of the mold; The convex mold of the third mold protruding from the second mold is aligned with the cavity of the first mold, The top of the cup lid, the annular side wall, and the positioning ring are formed between the mold cavity and the convex mold; The first mold surface of the first mold is aligned with the second mold surface of the second mold, the wedge block of the first mold is aligned with the wedge groove of the second mold, and the extension of the cup cover The sheet is formed between the wedge-shaped groove and the wedge-shaped block; the shallow concave shape of the first mold is aligned with the backing portion of the third mold, and the buckle piece of the cup cover is between the shallow concave shape and the backing portion forming. The mold assembly of the plastic cup lid according to claim 1, wherein the buckle module is radially protruded at corresponding positions on the circumferential mold side of the convex mold one hundred and eighty degrees apart; and the second mold surface is on a A wedge-shaped groove is recessed in each axial direction at a relative position of one hundred and eighty degrees; the wedge-shaped block is protruded in each axial direction on the first mold surface at a relative position of one hundred and eighty degrees; the cup lid formed accordingly has a The extension piece, and each extension piece has a buckle piece. According to claim 1 or 2, the plastic cup lid mold assembly, wherein the wedge block further includes a deep concave shape provided on both sides of the shallow concave shape, and the buckle piece and the extension of the cup lid formed accordingly The joint of the sheet has a reinforcing part with increased structural thickness. According to claim 3, the plastic cup lid mold assembly, wherein the deep concave shape is connected to the edge of the wedge block, and the reinforcing part of the cup lid according to this type extends to the bottom edge of the buckle piece.

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