A cup lid forming mold, a cup lid, and a pulp molding machine

Abstract

The present invention discloses a cup lid forming mold, a cup lid, and a pulp molding machine. The forming mold includes an upper mold and a lower mold; the lower mold includes a lower mold core; the upper mold includes an upper mold core and a wire pressing frame sleeved inside the upper mold core. A groove portion adapted to the shape of the inner wall of the lower part of the cup lid is provided on the wire pressing frame. An annular depression is provided on the outer peripheral wall of the groove portion, and the surface shape of the annular depression is complementary to the surface shape of the annular protrusion of the cup lid; the surface shape of the lower mold core is the same as the shape of the cup lid, and the surface shapes of the upper mold core and the groove portion are complementary to the surface shape of the cup lid; by providing the upper mold, providing the groove portion and the annular depression on the wire pressing frame, and matching the upper mold and the wire pressing frame with the lower mold, an annular protrusion is formed on the cup lid, eliminating the process of forming a fastening portion on the cup lid through secondary pressing by a mold, reducing production steps, costs, etc., and improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of moulds, and in particular to a cup cover forming mould and a cup cover and pulp moulding machine. Background Art

[0002] Paper cups and paper cup covers are recyclable, biodegradable and environmentally friendly products. Paper cups are widely used to hold liquid foods such as hot drinks and cold drinks or solid foods such as ice cream. The edge of the top of the paper cup is provided with a convex edge, and the inner wall of the paper cup cover is provided with a depression matched with the convex edge or an inverted buckle is provided on the inner wall of the paper cup cover. The convex edge of the paper cup is then buckled with the depression of the paper cup cover or the lower surface of the convex edge of the paper cup is used to contact the upper surface of the inverted buckle to achieve leak prevention.

[0003] However, forming a groove or undercut on the paper cup cover requires secondary processing on the semi-finished paper cup cover, that is, the paper cup cover is deformed by pressing the mold to form the groove or undercut.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a cup cover forming mold and a cup cover and pulp molding machine, aiming to solve the problem that the grooves or undercuts on the existing paper cup covers require additional molds to deform them, thereby increasing production steps and production costs.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A cup cover forming mold, comprising: an upper mold and a lower mold; the lower mold comprises a lower mold core; the upper mold comprises an upper mold core and a screen pressing frame sleeved in the upper mold core, the screen pressing frame is provided with a groove portion adapted to the shape of the inner wall of the lower part of the cup cover, the outer peripheral wall of the groove portion is provided with an annular depression, the surface shape of the annular depression is complementary to the surface shape of the annular protrusion of the cup cover; the surface shape of the lower mold core is the same as the shape of the cup cover, and the surface shapes of the upper mold core and the groove portion are complementary to the surface shape of the cup cover.

[0008] In the cup cover forming mold, the depth of the annular depression is 1.65 mm; the height of the annular depression is 0.58 mm.

[0009] In the cup cover forming mold, the upper mold core includes a downwardly recessed accommodating portion with the same shape as the outer surface of the pressing frame, and a raised portion arranged in the middle of the upper mold core with the same shape as the top surface of the cup cover, and a first through hole is provided in the accommodating portion, and the first through hole passes through the upper mold core; the back side of the upper mold core is connected to the first heating mechanism.

[0010] In the cup lid forming mold described above, a number of second through holes are equiangularly provided on the raised portion. The second through holes penetrate the upper mold core, and the second through holes are connected to the first heating mechanism.

[0011] In the cup lid forming mold described above, a recessed portion is provided on the raised portion and recessed downward. A number of third through holes are provided on the recessed portion. The third through holes penetrate the upper mold core, and the third through holes are connected to the first heating mechanism.

[0012] In the cup lid forming mold described above, the diameter of the first through hole is 6 mm, the diameter of the second through hole is 1.5 mm, and the diameter of the third through hole is 1.5 mm.

[0013] In the cup lid forming mold described above, a fourth through hole is provided on the circumference of the front surface of the lower mold core. The fourth through hole penetrates the lower mold core, and the fourth through hole is connected to the second heating mechanism.

[0014] In the cup lid forming mold described above, the diameter of the fourth through hole is 1.5 mm.

[0015] A cup lid is formed by clamping the cup lid forming mold.

[0016] A pulp molding machine includes a slurry suction mold for molding, a drying mold for drying, a heating mechanism for heating the drying mold, and a transfer mold for transferring the formed cup lid from the slurry suction mold to the drying mold. The drying mold includes the upper mold and the lower mold described above, and the heating mechanism includes a first heating mechanism and a second heating mechanism.

[0017] Beneficial effects:

[0018] The present invention provides a cup lid forming mold, a cup lid, and a pulp molding machine. By providing an upper mold and arranging a groove portion and an annular recess on the pressing mesh frame, and by cooperating the upper mold and the pressing mesh frame with the lower mold, an annular protrusion is formed on the cup lid, eliminating the process of forming a snap-fit portion on the cup lid through secondary pressing by a mold, reducing production steps, costs, etc., and improving production efficiency. Description of the drawings

[0019] Figure 1 Structural schematic of the upper mold in the cup lid forming mold, cup lid, and pulp molding machine provided by the present invention Figure 1 。

[0020] Figure 2 Structural schematic of the upper mold Figure 2 。

[0021] Figure 3 Top view of the upper mold.

[0022] Figure 4 is Figure 3 a sectional view taken along line B-B in

[0023] Figure 5 a schematic structural view of the Figure 1 .

[0024] Figure 6 a schematic structural view of the Figure 2 .

[0025] Figure 7 front view of the

[0026] Figure 8 is Figure 7 an enlarged view of part S in

[0027] Figure 9 a schematic structural view of the Figure 1 .

[0028] Figure 10 a schematic structural view of the Figure 2 .

[0029] Figure 11 schematic structural diagram of the

[0030] Figure 12 sectional view of the

[0031] Figure 13 is Figure 12 an enlarged view of part M in

[0032] In the drawings: 1 - upper die, 2 - lower die, 11 - upper die core, 12 - screen pressing frame, 121 - groove part, 122 - annular depression, 21 - lower die core, 211 - fourth through hole, 212 - annular heat conducting plate, 111 - accommodating part, 112 - protruding part, 1111 - first through hole, 1112 - threaded hole, 1121 - second through hole, 113 - depressed part, 1131 - third through hole, 13 - annular heat conducting strip, 100 - cup lid, 200 - annular protrusion, 300 - nozzle opening, 400 - air hole. Detailed Embodiment

[0033] The present invention provides a cup lid forming mold, a cup lid, and a pulp molding machine. To make the objectives, technical solutions, and effects of the present invention clearer and more definite, the following further elaborates on the present invention with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the protection scope of the present invention.

[0034] Please refer to Figure 1 - 13, the present invention provides a cup lid forming mold, comprising: an upper mold 1 and a lower mold 2; the lower mold 2 includes a lower mold core 21; the upper mold 1 includes an upper mold core 11 and a wire pressing frame 12 sleeved in the upper mold core 11. A groove portion 121 adapted to the shape of the inner wall of the lower part of the cup lid 100 is provided on the wire pressing frame 12. An annular depression 122 is provided on the outer peripheral wall of the groove portion 121, and the surface shape of the annular depression 122 is complementary to the surface shape of the annular protrusion 200 of the cup lid 100; the surface shape of the lower mold core 21 is the same as the shape of the cup lid 100, and the surface shapes of the upper mold core 11 and the groove portion 121 are complementary to the surface shape of the cup lid 100. The cup lid 100 is arranged between the upper mold 1 and the lower mold 2.

[0035] In practical applications, the cup lid 100 has moisture, and the moisture needs to be extruded and shaped by pressing the upper mold 1 and the lower mold 2. The cup lid 100 is located between the upper mold 1 and the lower mold 2. Due to the arrangement of the groove portion 121 and the annular depression 122, when the upper mold 1 and the lower mold 2 are closed, an annular protrusion 200 adapted to the annular depression 122 is formed on the inner wall of the lower part of the cup lid 100. In use, the annular protrusion 200 serves to catch the convex edge of the cup body. By providing the upper mold 1, with the groove portion 121 and the annular depression 122 provided on the wire pressing frame 12, the upper mold 1, the wire pressing frame 12 and the lower mold 2 cooperate to form an annular protrusion 200 on the cup lid 100, eliminating the process of the semi-finished cup lid 100 needing to be secondarily pressed by a mold to form a fastening portion, reducing production steps, costs, etc., and improving production efficiency.

[0036] Please refer to Figure 5 - 8 , further, the depression depth L of the annular depression 122 is 1.65 mm; the height H of the annular depression 122 is 0.58 mm. The annular depression 122 with such depth and height ensures that the annular protrusion 200 formed on the cup lid 100 after pressing has a proper protruding degree. On the premise of ensuring good engagement between the cup lid 100 and the cup body, it will not affect the demolding of the upper mold 1 and the lower mold 2 due to the excessive depth of the annular depression 122, that is, the upper mold 1 and the lower mold 2 cannot be separated. It should be noted here that the above-mentioned depth and height are the optimal values.

[0037] Please refer to Figure 1 - 4, Further, the upper die core 11 includes a receiving portion 111 that is recessed downward and has the same shape as the outer surface of the screen pressing frame 12, and a protruding portion 112 that is provided in the middle of the upper die core 11 and has the same shape as the top surface of the cup lid 100. A first through hole 1111 is provided on the receiving portion 111, and the first through hole 1111 penetrates through the upper die core 11; the back surface of the upper die core 11 is connected to a first heating mechanism (not shown in the figure). The receiving portion 111 is used to place the screen pressing frame 12, and threaded holes 1112 are provided at the four corner positions of the receiving portion 111 and the four corner positions of the screen pressing frame 12, so that the screen pressing frame 12 is detachably arranged in the receiving portion 111. In practical applications, the cup lid 100 still contains a relatively large amount of moisture only by pressing the upper die 1 and the lower die 2. By providing the first heating mechanism to heat the upper die 1 and the screen pressing frame 12, the evaporation of the moisture in the cup lid 100 can be accelerated by heating. The first through hole 1111 is provided to facilitate the rapid transfer of heat to the screen pressing frame 12, so that the screen pressing frame 12 is heated up, thereby enabling the moisture in the lower part of the cup lid 100 to evaporate rapidly. Specifically, the upper die 1 and the screen pressing frame 12 are both made of materials with good heat conduction effects, such as aluminum. Specifically, the upper die 1 and the screen pressing frame 12 are made of materials of the same material.

[0038] Further, a plurality of second through holes 1121 are equiangularly provided on the protruding portion 112, the second through holes 1121 penetrate through the upper die core 11, and the second through holes 1121 are connected to the first heating mechanism. Through the above settings, the heat conduction speed of the protruding portion 112 is accelerated.

[0039] Further, a recessed portion 113 is provided on the protruding portion 112, a plurality of third through holes 1131 are provided on the recessed portion 113, the third through holes 1131 penetrate through the upper die core 11, and the third through holes 1131 are connected to the first heating mechanism. Through the above settings, the heat conduction speed of the recessed portion 113 is accelerated. Through the cooperation of the first through hole 1111, the second through hole 1121, and the third through hole 1131, the heat reaching the cup lid 100 is equal, so that each part of the cup lid 100 can reach the temperature required for drying at the same time.

[0040] Further, the diameter of the first through hole 1111 is 6 mm, the diameter of the second through hole 1121 is 1.5 mm, and the diameter of the third through hole 1131 is 1.5 mm. The first through hole 1111, the second through hole 1121, and the third through hole 1131 with the above diameters have better heat conduction ability, which can enable the upper die 1 and the screen pressing frame 12 to be heated up quickly and accelerate the drying speed of the cup lid 100; moreover, when the diameter is too large, visible pores are likely to be formed on the cup lid 100, affecting the appearance quality of the cup lid 100, and when the diameter is too small, it is not conducive to heat conduction and prolongs the time required for mold closing. Specifically, please refer to Figure 3 - 4, the diameters of the heat inlet ends of the first through hole 1111, the second through hole 1121, and the third through hole 1131 are larger than those of the heat outlet ends. Similarly, while ensuring the appearance quality of the cup lid 100, it is beneficial to accelerate the heat conduction speed. Of course, the said diameters are all optimal values, and other values can be selected on the premise of ensuring heat conduction and appearance quality.

[0041] Please refer to Figure 2 , further, a first annular heat conduction mechanism is provided on the back of the upper mold 1. The first annular heat conduction mechanism includes a plurality of annular heat conduction strips 13. The diameters of each annular heat conduction strip 13 are different. Specifically, the diameter gradually decreases from the outside to the inside, and each annular heat conduction strip 13 is concentrically arranged in the middle of the upper mold 1. The first through hole 1111, the second through hole 1121, and the third through hole 1131 are respectively separated by a plurality of annular heat conduction strips 13. Through the above settings, the annular heat conduction strips 13 are connected to the first heating mechanism, so that the heat conduction effects at various positions of the upper mold core 11 are the same, that is, the temperatures at various positions are the same, which is beneficial to transfer heat to the cup lid 100 through the first through hole 1111, the second through hole 1121, and the third through hole 1131.

[0042] Please refer to Figure 9 - 10 , further, a fourth through hole 211 is provided on the circumference of the front surface of the lower mold core 21. The fourth through hole 211 penetrates the lower mold core 21, and the fourth through hole 211 is connected to a second heating mechanism (not shown in the figure). By setting the second heating mechanism to heat the lower mold 2, similarly, the lower mold 2 is made of a material with good heat conduction effect, such as aluminum profile 6061.

[0043] Further, the diameter of the fourth through hole 211 is 1.5 mm. The fourth through hole 211 with the above diameter has better heat conduction ability, can make the lower mold 2 heat up quickly, and accelerate the drying speed of the cup lid 100. Specifically, the diameter of the heat inlet end of the fourth through hole 211 is larger than that of the heat outlet end. Similarly, the heat conduction speed can be accelerated. Of course, the said diameters are all optimal values, and other values can be selected on the premise of ensuring heat conduction and appearance quality.

[0044] Further, a second annular heat conduction mechanism is provided on the back of the lower mold 2. The second annular heat conduction mechanism includes a plurality of annular heat conduction plates 212. The sizes of each annular heat conduction plate 212 are the same, and the distances from the center of the lower mold 2 are the same. The fourth through hole 211 is arranged at the periphery of the annular heat conduction plate 212. Similarly, through the above settings, the annular heat conduction plates 212 are connected to the second heating mechanism, so that the heat conduction effects at various positions of the lower mold core 21 are the same, that is, the temperatures at various positions are the same, which is beneficial to transfer heat to the cup lid 100 through the fourth through hole 211.

[0045] Please refer to Figure 11 - 13, a cup lid 100, which is formed by clamping the cup lid forming mold. A ring-shaped protrusion 200 is provided on the inner wall of the lower part of the cup lid 100. During use, the convex edge of the cup body is slightly forced to pass through the ring-shaped protrusion 200, so that the upper surface of the ring-shaped protrusion 200 contacts the lower surface of the convex edge. Since the ring-shaped protrusion 200 extends towards the middle of the cup lid 100, it plays a good fixing role on the convex edge of the cup body, thereby making the cup body and the cup lid 100 snap together. In one embodiment, for convenient reference, a suction nozzle 300 can be provided on the upper surface of the cup lid 100; in order to keep the air pressure consistent with the outside and facilitate the outflow of the cup body from the suction nozzle 300, a vent hole 400 can be provided on the upper surface of the cup lid 100. In another embodiment, in order to facilitate people to take the ice cream in the cup body, a feeding hole can be provided on the upper surface of the cup lid 100.

[0046] A pulp molding machine includes a pulp suction mold for molding, a drying mold for drying, a heating mechanism for heating the drying mold, and a transfer mold for transferring the molded cup lid 100 from the pulp suction mold to the drying mold. The drying mold includes the upper mold 1 and the lower mold 2, and the heating mechanism includes a first heating mechanism and a second heating mechanism. The pulp suction mold is used to adsorb pulp. When the pulp reaches a certain thickness on the pulp suction mold, the pulp suction mold is taken out, and the water in the pulp can be quickly removed by vacuum suction. When the water content of the cup lid 100 in the pulp suction mold drops to about 30%, the transfer mold is clamped with the pulp suction mold, and the preliminarily formed cup lid 100 in the pulp suction mold is transferred to the transfer mold by negative pressure adsorption. The transfer mold transfers the cup lid 100 to the lower mold 2, and the upper mold 1 and the lower mold 2 are clamped and the first heating mechanism and the second heating mechanism respectively heat the upper mold 1 and the lower mold 2 to make the upper mold 1 and the lower mold 2 reach 180 - 220 °C. During the clamping process, the water is quickly squeezed out and the cup lid 100 is quickly dried and formed by heating.

[0047] In summary, in the present invention, by providing the upper mold 1, the groove part 121 and the ring-shaped depression 122 are provided on the pressing mesh frame 12. Through the cooperation of the upper mold 1 and the pressing mesh frame 12 with the lower mold 2, a ring-shaped protrusion 200 is formed on the cup lid 100, eliminating the process of the cup lid 100 needing to be secondarily pressed by a mold to form a fastening part, reducing the production steps, costs, etc., and improving the production efficiency. By limiting the size of the ring-shaped depression 122, the occurrence of interference is avoided. By providing the first through hole 1111, the second through hole 1121, the third through hole 1131, the first heating mechanism and the ring-shaped heat conducting strip 13, it is beneficial to the rapid heat conduction of the upper mold 1 and the pressing mesh frame 12. By providing the third through hole 1131, the second heating mechanism and the ring-shaped heat conducting plate 212, it is beneficial to the rapid heat conduction of the lower mold 2. Through the above settings, the cup lid 100 discharges water by extrusion drainage and heating evaporation, accelerating the speed of the cup lid 100 discharging water and improving the production efficiency.

[0048] It is understandable that those of ordinary skill in the art can make equivalent substitutions or changes based on the technical solutions and inventive concepts of the present invention, and all such changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A cup lid forming mold, characterized in that, it includes: an upper mold and a lower mold; the lower mold includes a lower mold core; the upper mold includes an upper mold core and a wire pressing frame sleeved inside the upper mold core. A groove portion adapted to the shape of the inner wall of the lower part of the cup lid is provided on the wire pressing frame. An annular depression is provided on the outer peripheral wall of the groove portion, and the surface shape of the annular depression is complementary to the surface shape of the annular protrusion of the cup lid; the surface shape of the lower mold core is the same as the shape of the cup lid, and the surface shapes of the upper mold core and the groove portion are complementary to the surface shape of the cup lid; the depth of the annular depression is 1.65 mm; the height of the annular depression is 0.58 mm; the upper mold core includes a receiving portion that is recessed downward and has the same outer surface shape as the wire pressing frame, and a protrusion portion provided in the middle of the upper mold core and having the same surface shape as the top surface of the cup lid. A first through hole is provided on the receiving portion, and the first through hole penetrates the upper mold core; the back surface of the upper mold core is connected to a first heating mechanism; a plurality of second through holes are equiangularly provided on the protrusion portion, the second through holes penetrate the upper mold core, and the second through holes are connected to the first heating mechanism; a recessed portion is provided on the protrusion portion, and a plurality of third through holes are provided on the recessed portion, the third through holes penetrate the upper mold core, and the third through holes are connected to the first heating mechanism; the diameter of the first through hole is 6 mm, the diameter of the second through hole is 1.5 mm, and the diameter of the third through hole is 1.5 mm; the diameter of the heat inlet end of the first through hole, the second through hole, and the third through hole is larger than the diameter of the heat outlet end; a first annular heat conduction mechanism is provided on the back surface of the upper mold. The first annular heat conduction mechanism includes a plurality of annular heat conduction strips. The diameter of each annular heat conduction strip gradually decreases from the outside to the inside, and each annular heat conduction strip is concentrically arranged in the middle of the upper mold. The first through hole, the second through hole, and the third through hole are respectively separated by a plurality of annular heat conduction strips; a fourth through hole is provided on the circumference of the front surface of the lower mold core, the fourth through hole penetrates the lower mold core, and the fourth through hole is connected to a second heating mechanism; the diameter of the fourth through hole is 1.5 mm; the diameter of the heat inlet end of the fourth through hole is larger than the diameter of the heat outlet end; a second annular heat conduction mechanism is provided on the back surface of the lower mold. The second annular heat conduction mechanism includes a plurality of annular heat conduction plates. The size of each annular heat conduction plate is the same, and the position from the center of the lower mold is the same. The fourth through hole is provided at the periphery of the annular heat conduction plate.

2. A cup lid, characterized in that, it is formed by clamping the cup lid forming mold according to claim 1.

3. A pulp molding machine, characterized in that, it includes a pulp suction mold for molding, a drying mold for drying, a heating mechanism for heating the drying mold, and a transfer mold for transferring the formed cup lid from the pulp suction mold to the drying mold. The drying mold includes the upper mold and the lower mold according to claim 1, and the heating mechanism includes a first heating mechanism and a second heating mechanism.

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