TWM634337U - Shaping mechanism for reverse buckle in paper and plastic cup lid - Google Patents

Abstract

A forming mechanism for the inner buckle ring of the paper-plastic cup lid. It is used in the process of manufacturing the paper-plastic cup lid. When extrusion molding is an initial product, the part of an inner buckle ring is extruded on the initial product at the same time, and after subsequent hot-pressing and shaping operations, the finished product of the paper-plastic cup lid is There is a structure of an inner buckle ring; compared with the prior art, this creation does not need a second operation (processing), nor does it need to be equipped with a mold for the second operation (processing), which obviously reduces the manufacturing cost and reduce manufacturing time.

Description

The forming mechanism of the inner buckle ring of the paper-plastic cup lid

This creation is about the forming mechanism of the inner buckle ring of a paper-plastic cup lid, especially when a slurry suction mold sends the absorbed slurry layer into the hot pressing upper mold for mold closing and extrusion, the slurry layer is immediately Extrusion molding is a preform, and at the same time, a forming mechanism for an inner reverse buckle is produced on the preform.

According to, in view of the environmental hazards of plastic material products, there have been developments in which pulp fiber materials and/or plant fiber materials are mixed and beaten as slurry raw materials, and then the slurry is sucked and attached to the slurry by a suction mold to produce a "slurry". layer", and then the "slurry layer" first undergoes an extrusion molding operation to become a "primary product", and then the "primary product" undergoes a hot-pressing setting operation to become a "paper-plastic product". Paper and plastic products have the advantage of being easy to recycle, remanufacture and reuse, and conform to the trend of environmental protection and reuse, energy saving and carbon reduction, so they are quickly accepted and adopted by the industrial and commercial circles and the general public. At present, due to the large number of cups of take-away beverages (such as hot coffee, hot tea, etc.) in the world every day, disposable paper-plastic cup bodies and paper-plastic cup lids are paid more attention to.

A conventional paper-plastic cup cover 1, as shown in Figures 1 to 3, has a top 11 in its structure, and the top 11 is provided with a drinking opening 111 to facilitate the drinking of beverages in the cup. There may be various structures on the roof, but the various structures on the roof 11 are not related to the discussion of this case, so the various possible structures on the roof 11 will not be described in detail; the periphery of the roof 11 is formed by drooping in a radian A part of the upper surrounding wall 12, the bottom edge of the upper surrounding wall 12 expands outwards, sags in a circular arc and slightly concaves inward to form a part of an outer covering edge 13, and the bottom edge of the outer covering edge 13 is concave inward And then reverse outward expansion forms the position of an inner concave arc 14, then the bottom edge of this inner concave arc 14 deviates outwards to be the position of a lifting wall 15.

When in use, the paper-plastic cup lid 1 is used to cover the mouth of a corresponding cup body 2, and its use state is shown in Figure 3, because the outer ring of the cup mouth of the cup body 2 is convex Therefore, it is blocked by the outer flange 21. Of course, it cannot be completely covered at first. Therefore, the outer covering edge 13 on one side of the paper-plastic cup lid 1 must be wrapped to the outer protrusion of the corresponding part of the cup body 2. edge 21, and then further apply force to make the rest of the outer covering edge 13 expand slightly and immediately restore to force it to cross the remaining corresponding outer flange 21, so that the outer flange of the cup body 2 is formed by the outer covering edge 13 as a whole The whole ring of 21 is tightly covered, and at the same time, because the inner concave arc 14 obliquely supports the outer bottom edge of the outer flange 21, it can make it difficult for the closed paper-plastic cup lid 1 to be lifted upwards , thereby enhancing the wrapping stability between the outer covering edge 13 and the outer flange 21 .

As can be seen from FIG. 3 , it is known that the paper-plastic cup lid 1 must be formed with two parts, the outer covering edge 13 and the inner concave arc 14, in order to achieve tight covering on the outer flange 21 of the cup mouth of the cup body 2. As is known at present, the paper-plastic cup lid 1 must undergo two operations in order to completely form the two parts of the outer cover 13 and the inner concave arc 14. The first operation is to go through the processes of slurry suction, extrusion, and hot pressing. A "pioneer finished product of paper-plastic cup lid" is produced afterward, and this "pioneer finished product of paper-plastic cup lid" is shown in Figure 4, wherein the top surface 11, the upper surrounding wall 12, the top of the outer covering edge 13 and the lifting wall All parts of 15 have been completely formed, but the lower part of the outer covering edge 13 and the concave arc 14 have not yet appeared, so it must be processed for the second time before it can be formed as shown in Figure 2 and Figure 3 The lower part of the outer covering edge 13 and the inner concave arc 14 come from. It is known that the paper-plastic cup lid 1 must be operated twice to completely form the lower part of the outer covering edge 13 and the inner concave arc 14. It is because of the consideration and limitation of the direction when the suction mold is released, resulting in the same The bottom of the outer covering edge 13 and the position of the continuous reverse arc of the concave arc 14 cannot appear at the same time, so the upper part of the outer covering edge 13 and the lifting wall 15 can only be selected to be made first, and then come After the second operation (processing) process, the lower part of the outer covering edge 13 and the inner concave arc 14 are completely formed.

It is known that the top surface, the upper surrounding wall, the upper part of the outer cladding and the parts of the wall are formed through the first operation, and then the lower part of the outer cladding and the inner concave arc are formed through the second operation (processing). Two Bit Lai's patent, TWI430923 and CNZL200910157668.6 "Manufacturing method of plant fiber molded cup lid barb groove" is that it uses a set of molding strips of sliders to touch the surface of the paper-plastic cup lid, and the inside is made of a The receiving groove of a ring on the inner mold corresponds to the lower part of the outer cladding and the inner concave arc (named "barb groove" in the patent), and then pushes the set of sliders to advance from the outside to the inside , so that the surface of the paper-plastic cup cover is retracted into the receiving groove of the inner mold with the deformation of the contour of the molding strip, thus forming a ring-shaped "barb groove" (equal to the lower part of the outer covering edge and the inner concave part of the arc).

In addition, it is known that the top surface, the upper wall, the inner concave arc and the lifting wall are formed through the first operation, and then the outer cladding is formed through the second operation (processing). Patents, TWI542755 and CNZL201410151021.3 "Molded Cup Lid Outer Covering Manufacturing Method and Finished Product" patents are that they use a set of sliders on the outer mold to advance to the outer surface of the outer cover for pre-molding, and then an inner There is a horizontally movable forming die in the middle of the mold, and the forming die is advanced to squeeze the inner surface of the paper-plastic cup lid to form the outer covering edge from the inside to the outside, so that a ring-shaped outer covering is deformed.

Later, there were TW I730350 and CN ZL201921023649.X patents, which also formed the top surface, the upper wall, the upper part of the outer cladding and the parts of the wall through the first operation, and then went through the second operation (processing) ) to form the lower part of the outer cladding edge and the two parts of the inner concave arc. During the second operation (processing), a ring rubber ring is used. The rubber ring is a flexible elastic body. Accommodated in the bottom surface of an upper mold part, by pushing the upper mold part, the apron is pressed against the outside of the place where the inner concave arc is predetermined to be formed, and the part where the inner concave arc is generated by pushing.

Above-mentioned all known patents all must be equipped with the mold that the second operation (processing) is used when carrying out, and after the second operation (processing), just can produce complete outer cladding edge and inner concave arc, therefore There will be a relatively high manufacturing cost and a more complicated manufacturing process, and there will be real-value improvements.

In response to the above-mentioned needs, the creator of the present invention deeply conceived, developed and improved. The idea is to provide a forming mechanism for the inner buckle ring of the paper-plastic cup lid, which is mainly used in the process of manufacturing the paper-plastic cup lid. When the suction mold absorbs When the slurry layer is sent into the hot-pressing upper mold for clamping and extruding to extrude the slurry layer into an initial product, a part of an inner reverse buckle can be molded on the initial product at the same time, so that After the follow-up heat-pressing and setting operation, the finished product of the paper-plastic cup lid already has an inner buckle ring, so there is no need for a second operation (processing), and there is no need to have a second Molds for operation (processing) can relatively reduce manufacturing costs and reduce manufacturing time. Aiming at the above thoughts, after a long time of hard work, the author of this work has produced this creation.

The reason is that the main purpose of this creation is to provide a molding mechanism for the inner reverse ring of the paper-plastic cup lid that can reduce manufacturing costs and reduce manufacturing time.

Another main purpose of this creation is to provide a process for making paper-plastic cup lids. When the slurry suction mold sends the absorbed slurry layer into the hot pressing upper mold, the mold is closed and squeezed to extrude the slurry layer. When it is an embryo product, a forming mechanism for the inner inverted ring of the paper-plastic cup lid at the inner inverted ring position can be molded on the embryo product at the same time.

In order to achieve the above purpose, this creation creates a forming mechanism for the inner buckle ring of the paper-plastic cup lid. The paper-plastic cup lid is manufactured and formed by a paper-plastic product automatic forming machine. The paper-plastic product automatic forming machine has a suction forming area and a hot-press setting area, the slurry suction forming area is provided with a slurry box and a slurry suction mold in an action space, the slurry box is filled with slurry, and the slurry suction mold can be lifted and lowered in the action space; The hot-press setting area is provided with a hot-press upper mold and a hot-press lower mold in an action space. The die face of the hot pressing die is facing downward; the hot pressing lower die is arranged under the hot pressing upper die, and can be pushed to move up and down, and the die face of the hot pressing lower die faces upward; the slurry suction die is sucked in the slurry box The slurry forms a slurry layer, and then adsorbs the slurry layer Rise up and leave the pulp box, and at the same time, the hot-press upper die moves to the middle and stops above the slurry-suction die, and then the slurry-suction die rises and presses the slurry layer with the hot-press upper die, so that the slurry layer Shaping and transforming into a blank; then the suction mold is separated from the blank and descends, and the hot-press upper mold absorbs the blank and moves back to its position; then the hot-press lower mold rises and the hot-press The upper mold closes the mold to carry out hot pressing and setting operation on the preliminary product, so that the preliminary product is shaped and transformed into a paper-plastic cup cover; the characteristic is that a ring groove is set on the outer edge of the side of the hot pressing upper mold When the slurry suction die rises and the hot-pressing upper die closes to squeeze the slurry layer, part of the slurry enters the groove and stays in the groove due to being squeezed, so that the slurry layer is integrally formed into a ring. The undercut ring, the inner undercut ring is transformed into a part of the blank with the co-extrusion of the slurry layer, and becomes a part of the paper-plastic cup cover after being heat-pressed and shaped.

According to the above structure, compared with the prior art, this invention does not need to have a second operation (processing), nor does it need to be equipped with a mold for the second operation (processing), which can obviously reduce manufacturing costs and reduce manufacturing time. .

1: paper plastic cup lid

11: Cover the top

111: drinking mouth

12: Upper wall

13: outer cladding edge

14: Inner concave arc

15: Climbing the wall

2: cup body

21: Outer flange

3: Automatic forming machine for paper and plastic products

30: Slurry suction forming area

31: Action space

32: pulp box

33: suction mold

33A: Model

40:Hot pressing setting area

40L: left heat press setting area

40R: Right heat press setting area

41: Action space

42: hot pressing upper mold

42A: Model

42B: Groove

43: hot pressing die

43A: Model

5A: slurry layer

5a: Inner buckle ring

5B: First embryo

5C: paper plastic cup lid

Shown in Fig. 1 is the three-dimensional view of conventional paper-plastic cup lid.

Shown in Fig. 2 is the side view of conventional paper-plastic cup lid.

Figure 3 is a schematic cross-sectional view of a conventional paper-plastic cup lid in use when it is closed to the mouth of the cup body.

Figure 4 is a schematic cross-sectional view of a conventional paper-plastic cup lid before forming a concave arc.

Figure 5 is a schematic structural view of an automatic molding machine for paper-plastic products.

Shown in Fig. 6 is the cross-sectional schematic diagram of the slurry layer absorbed by the slurry suction mold in this creation.

Shown in Fig. 7 is the structural representation of the hot pressing upper die in this creation.

Figure 8 is a schematic cross-sectional view of the slurry suction mold and the hot-press upper mold clamping and extruding the slurry layer in this creation to transform into an embryo and extruding to produce an inner reverse buckle ring.

Fig. 9 shows the cross-sectional schematic view of the hot-pressing upper die absorbing the initial product and the inner inverted buckle ring in this creation.

Shown in Fig. 10 is the structural representation of the hot pressing die in this creation.

Fig. 11 shows the cross-sectional schematic view of the hot-pressing lower mold and the hot-pressing upper mold clamping the initial product to make the transformation into a paper-plastic cup lid and an inner inverted buckle ring.

Fig. 12 shows the sectional schematic diagram of the heat-pressing lower mold in this creation absorbing the paper-plastic cup lid (including the inner buckle ring).

Figure 13 is a schematic cross-sectional view of the use state of the paper-plastic cup lid (including the inner inverted buckle) covering the mouth of the cup body.

In order to achieve the above-mentioned purpose, the technical means adopted in this creation and the practical and progressive effects that can be achieved are described in detail below with reference to the accompanying drawings for the benefit of a complete understanding.

In order to explain the detailed structure and working process of the forming mechanism of the inverted buckle ring in the paper-plastic cup lid of this creation, it is necessary to explain most of the structure and working principle of the general automatic forming machine for paper-plastic products.

A paper-plastic product automatic forming machine 3, as shown in Figure 5, is structurally divided into a slurry-absorbing forming area 30 located in the middle and a hot-press shaping area 40 located on the left and right sides of the slurry-absorbing forming area 30, for convenience of description. It is divided into different names of the left hot-press setting area 40L and the right hot-press setting area 40R. The slurry suction forming area 30 is provided with a slurry box 32 and a slurry suction mold 33 in an action space 31, wherein the slurry box 32 is fixedly arranged inside the action space 31, and the slurry box 32 is filled with slurry , the top surface is an open shape; the slurry suction mold 33 is immersed in the slurry box 32 inside, and the mold surface of the slurry suction mold 33 will be lower than the slurry surface of the slurry box 32 during the initial (return to zero) state, the suction slurry The bottom of the slurry mold 33 is driven by a support member and can be lifted; Regardless of whether it is 40L or 40R), an action space 41 is formed, and a hot-press upper mold 42 and a hot-press lower mold 43 are arranged inside the action space 41. The hot-press upper mold 42 is arranged at an upper position inside the action space 41, And hang on a guide rail, so as to be promoted to do lateral movement action, the mold face of this hot-pressing upper die 42 faces down; Die faces upwards, and the bottom of this hot pressing lower die 43 is promoted by a power cylinder and can do lifting action.

A large number of identical models will be developed on the die surface of the slurry suction mold 33, so that a plurality of identical models can simultaneously suck slurry at one time, so as to speed up the operation process. The single model 33A on the mold surface of the slurry suction mold 33 is as shown in Figure 6, and it is developed into the molding corresponding to the paper-plastic cup lid, and the mold surface of the slurry suction mold 33 will have a plurality of models arranged continuously 33A, when the slurry suction mold 33 started the slurry suction action, the top surface of each model 33A promptly adsorbed a layer of slurry layer 5A (shown in Figure 6), because it was in high humidity at this time, so the slurry layer 5A was obviously The one with the relatively large thickness.

After the slurry suction action is completed, the slurry suction mold 33 absorbs all the slurry layer 5A and rises away from the pulp box 32. During the process, the pumping device (not shown in the figure) connected to the slurry suction mold 33 starts the suction action, The slurry layer 5A is gradually dehumidified. During the process, the hot-press upper mold 42 is pushed to move to the middle and stops at the position above the slurry-suction mold 33, and then the slurry-suction mold 33 rises to match the hot-press upper mold. 42 Close the mold and extrude the slurry layer 5A.

Many identical models 42A corresponding to the model 33A on the slurry suction die 33 in number and shape can be developed on the die surface of the hot pressing upper die 42, so as to undertake the clamping extrusion of each model 33A. The single model 42A on the die surface of the hot-pressing upper die 42 is shown in Figure 7, and the molding of the model 42A is substantially corresponding to the model 33A on the slurry-suction die 33, but there is still a special structure with the model 33A. The model 33A is not for correspondence but can have particularity. The special structure is that the model 42A has a ring groove 42B on the outer edge of the side. Therefore when this slurry suction mold 33 rises and this hot-pressing upper mold 42 close molds when extruding this slurry layer 5A, as As shown in Fig. 8, the thickness of the slurry layer 5A will be reduced due to being squeezed, and at the same time, some slurry will enter the groove 42B to stay, so a ring of inner reverse buckle 5a will be integrally produced on the slurry layer 5A. During the extruding action, the slurry layer 5A (including the inner buckle ring 5a) is greatly dehumidified due to being extruded (compared with when it just left the slurry box 32), so it is relatively stronger and shaped And change into a first embryonic product 5B (comprising this inside buckle ring 5a).

When the extruding action is completed, the pumping device connected to the slurry suction mold 33 is converted into a blowing action to separate from the blank product 5B (including the inner buckle ring 5a), and immediately descends to carry out the next cycle. Slurry suction action, and simultaneously the pumping device (not shown in the figure) that this hot-pressing upper die 42 is connected starts the suction action, to adsorb the initial product 5B (including the inner inverted buckle ring 5a), as shown in Figure 9 As shown, then the hot pressing upper mold 42 absorbs the blank product 5B (including the inner reverse buckle ring 5a) and moves back to the original side position.

Next, the hot-pressing lower die 43 rises and closes with the hot-pressing upper die 42 to carry out hot-pressing and setting operations on the initial product 5B (including the inner reverse buckle ring 5a), and the die surface of the hot-pressing lower die 43 Most identical models 43A corresponding to the model 42A on the hot-pressing upper die 42 in number and shape will be developed on the upper part, so as to facilitate hot pressing with each model 42A. The single model 43A on the die surface of the hot-pressing lower die 43 is shown in Figure 10. The shape of the model 43A is substantially corresponding to the model 42A on the hot-pressing upper die 42, but there is no corresponding groove 42B. structure.

When the hot-pressing lower die 43 rises and the hot-pressing upper die 42 closes the mold to carry out the hot-pressing setting operation to the initial product 5B (comprising the inner reverse buckle ring 5a), as shown in Figure 11, the initial product 5B (including the inner undercut ring 5a) will shrink in thickness because of being heated and pressed, and the inner undercut ring 5a is more firmly connected with the body of the embryonic product 5B because of being heated and pressed (actually It has been integrally molded and shaped), after completing the hot-press setting operation, the original embryo product 5B (including the inner reverse buckle 5a) has been transformed into a paper-plastic cup lid 5C (including the inner buckle ring 5a) due to drying and setting including the inner undercut ring 5a).

After finishing the heat-press setting operation, the pumping device attached to the heat-press upper mold 42 is converted into a blowing function, so as to separate from the paper-plastic cup lid 5C (including the inner buckle ring 5a), as shown in FIG. 12 , the pumping device (not shown in the figure) connected to the hot-pressing lower die 43 activates the suction action to absorb the paper-plastic cup lid 5C (including the inner inverted buckle ring 5a) and drop back to its position, and then wait for another The set pick-up device (not shown in the figure) removes and collects the paper-plastic cup lid 5C (including the inner buckle ring 5a).

The paper-plastic cup lid 5C (including the inner inverted buckle 5a) that has just been finished by hot pressing is actually arranged in a continuous manner corresponding to the multi-quantity model 43A of the hot pressing lower die 43, so the material taking device is from this After the paper-plastic cup lid 5C (including the inner buckle ring 5a) is removed from the hot-pressing lower die 43, cutting operation must be performed, so that the paper-plastic cup lid 5C (including the inner buckle ring 5a) arranged continuously ) separately, that is, as shown in Figure 13, when a single paper-plastic cup lid 5C (including the inner buckle ring 5a) is used to cover the mouth of a corresponding cup body 2, the inner buckle The ring 5a can just clamp the outer flange 21 of the cup body 2, and help make the closed paper-plastic cup lid 5C difficult to be lifted upwards, so as to prevent liquid (especially hot liquid) in the cup body 2 The effect of spillover.

From the description of the structures of the above parts, it can be seen that the manufacturing and molding process of the paper-plastic cup lid 5C (including the inner inverted ring 5a) goes through the following steps:

1. The slurry suction mold 33 performs a slurry suction action in the slurry box 32, so that a layer of slurry layer 5A is adsorbed on the top surface of each mold 33A.

2. The hot-pressing upper die 42 moves toward the middle, and at the same time, the slurry suction die 33 absorbs all the slurry layer 5A and rises to press together with the hot-pressing upper die 42 to form a ring on the slurry layer 5A. Inner buckle ring 5a, while this slurry layer 5A (comprising this inner buckle ring 5a) is extruded and dehumidified greatly, is relatively more shaped and firm and promptly molds and transforms into an embryonic product 5B (comprising this inner buckle ring 5B) Buckle 5a).

3. The slurry suction mold 33 is detached from the primary product 5B (including the inner buckle ring 5a) and lowered back to its position, and at the same time, the hot pressing upper mold 42 absorbs the preliminary product 5B (including the inner reverse buckle ring 5a) Move sideways back into position.

4. The hot pressing lower mold 43 rises and the hot pressing upper mold 42 closes the mold to carry out the hot pressing and setting operation on the initial product 5B (including the inner reverse buckle ring 5a), so that the initial product 5B (including the inner buckle ring 5a) The inner undercut ring 5a) is transformed into a paper-plastic cup lid 5C (including the inner underturn ring 5a) due to being dried and shaped.

Based on the structures of the above-mentioned parts and the manufacturing process, it can be seen that the generation of the inner inverted buckle ring 5a is in the process of the slurry suction mold 33 absorbing the slurry layer 5A rising and the hot pressing upper mold 42 being closed and extruded. Layer 5A is extruded and partly enters the groove 42B provided on the outer edge of the side surface of the hot pressing upper die 42, so that the inner reverse buckle ring 5a is produced; at the same time, the slurry layer 5A is extruded and shaped In the process of changing into the initial product 5B, the inner inverted buckle 5a becomes firmer along with the slurry layer 5A being extruded and dehumidified, so that the inner inverted buckle 5a becomes impossible on the initial product 5B. A part that is detached; finally, after sending the embryonic product 5B (including the inner inverted buckle 5a) through hot pressing and shaping it into a paper-plastic cup lid 5C, the inner inverted buckle ring is already present on the paper-plastic cup lid 5C Part 5a. It can be seen from this that the inner undercut ring 5a has already been produced and exists during the die-closing extrusion process between the slurry suction die 33 and the hot pressing upper die 42 .

As can be seen from the above description, this creation is based on the process of manufacturing paper-plastic cup lids. When the slurry suction mold sends the absorbed slurry layer into the hot pressing upper mold, the mold is closed and extruded to shape the slurry layer into a When the initial product is produced, an inner buckle ring is extruded and molded on the initial product at the same time. Therefore, after the subsequent heat-pressing and shaping operation, the finished product of the paper-plastic cup lid already has an inner inverted ring. The structure of the buckle. Therefore this creation is relative to the conventional example in the prior art, and this creation does not need to have the second operation (processing) again, also needn't be provided with the mold that the second operation (processing) is used again, relatively really can save Manufacturing cost and reduced manufacturing time.

To sum up, the molding mechanism of the inner inverted buckle of the paper-plastic cup lid disclosed in this creation has never been seen in similar products, and it can be absolutely novel; at the same time, this creation has indeed achieved the expected creative purpose in use. When it already possesses practical and progressive nature, so it fully meets the requirements of various patents, it is hereby proposed to patent Please apply for a patent.

42: hot pressing upper mold

42A: Model

42B: Groove

Claims (1)

A forming mechanism for the inner buckle ring of the paper-plastic cup lid. The paper-plastic cup lid is manufactured by a paper-plastic product automatic forming machine. The paper-plastic product automatic forming machine has a suction forming area and a heat-pressing setting area. The slurry suction forming area is provided with a slurry box and a slurry suction mold in an action space, the slurry box is filled with slurry, and the slurry suction mold can be lifted up and down in the action space; the hot press setting area is in an action space There is a hot-pressing upper mold and a hot-pressing lower mold inside, the hot-pressing upper mold is set at the upper position inside the working space, and can be pushed to move laterally, the mold face of the hot-pressing upper mold faces downward; The pressing die is set under the hot pressing upper die and can be pushed to move up and down. The die face of the hot pressing lower die faces upward; the slurry suction die forms a slurry layer in the pulp box, and then Absorb the slurry layer and rise away from the slurry box, and at the same time, the hot-press upper die moves to the middle and stops above the slurry-suction die, and then the slurry-suction die rises and closes with the hot-press upper die to squeeze the slurry layer , so that the slurry layer is shaped and transformed into a preform; then the slurry suction mold is detached from the preform and descends, and the hot-press upper mold absorbs the preform and moves back to its position; then the hot-pressing The mold rises and the hot-pressing upper mold closes the mold to carry out hot-pressing and setting operations on the preliminary product, so that the preliminary product is shaped and transformed into a paper-plastic cup lid; There is a ring groove. When the slurry suction die rises and presses the slurry layer with the hot pressing upper mold, part of the slurry will enter the groove and stay in the slurry layer due to extrusion. A ring of inner undercut ring is integrally produced, and the inner undercut ring is transformed into a part of the embryonic product by being extruded together with the slurry layer, and becomes a part of the paper-plastic cup cover after being hot-pressed and shaped .

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