Packaging adhesive film forming extrusion equipment

Abstract

The utility model relates to packaging adhesive film forming extrusion equipment. The packaging adhesive film forming extrusion equipment comprises an embossing assembly, an adhesive film extrusion mold and two baffles. The knurling assembly comprises at least one knurling roller and at least one rubber roller which are arranged in parallel, a rolling gap allowing the rubber film to flow through is formed between the knurling roller and the rubber roller, and the knurling roller and the rubber roller can rotate relatively so as to extrude and form the rubber film in the rolling gap; the adhesive film extrusion die is arranged above the embossing roller and is used for extruding an adhesive film to the rolling gap; the two baffles are arranged in the axial direction of the embossing roller in a spaced mode and used for abutting against the edges of the two sides of the adhesive film respectively. The two baffles are arranged at intervals in the axial direction of the knurling roller and are used for abutting against the edges of the two sides of the adhesive film respectively, so that the knurling roller and the adhesive roller can compact the edges of the adhesive film, the thickness of the edges of the adhesive film is uniform, and the situation that the edges of battery pieces are damaged and broken due to pressure is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic module packaging technical field especially relates to encapsulation adhesive film forming extrusion equipment. BACKGROUND

[0002] With the continuous improvement of photovoltaic module photoelectric conversion efficiency, the advantage of photovoltaic power generation is also constantly emerging. The part of photovoltaic module that plays the role of photovoltaic power generation is the battery piece. In order to protect the battery piece, the battery piece is usually encapsulated. When the battery piece is encapsulated, the encapsulation adhesive film is used to connect the cover plate on the surface of the battery piece, and the cover plate is used to protect the battery piece. The performance of the photovoltaic module is affected by the quality of the encapsulation of the encapsulation adhesive film after lamination. In some cases, the encapsulation adhesive film used in the encapsulation process of the photovoltaic module is prone to cause damage and breakage of the edge of the battery piece during lamination. SUMMARY

[0003] Therefore, it is necessary to provide an encapsulation adhesive film forming extrusion equipment aiming at the technical problem that the encapsulation adhesive film used in the encapsulation process of the photovoltaic module is prone to cause damage and breakage of the edge of the battery piece during lamination.

[0004] An encapsulation adhesive film forming extrusion equipment comprises:

[0005] An embossing assembly comprises at least one embossing roller and at least one rubber roller arranged side by side, the embossing roller and the rubber roller have a roller gap for the adhesive film to flow through between the embossing roller and the rubber roller, and the embossing roller and the rubber roller can rotate relative to each other to extrude and form the adhesive film in the roller gap;

[0006] An adhesive film extrusion die is arranged above the embossing roller, and the adhesive film extrusion die is used to extrude the adhesive film to the roller gap; and

[0007] Two baffles are arranged along the axial direction of the embossing roller, and the two baffles are respectively used to abut the edges on both sides of the adhesive film.

[0008] In one embodiment, the baffles abut the film covering surfaces of the embossing roller and the rubber roller, and can move along the axial direction relative to the embossing assembly.

[0009] In one embodiment, the baffles have a first through hole, the embossing roller is arranged in the first through hole, and abuts the hole wall of the first through hole; and / or the baffles have a second through hole, the rubber roller is arranged in the second through hole, and abuts the hole wall of the second through hole.

[0010] In one of the embodiments, the encapsulation film forming and extruding device further comprises a film conveying frame and two limiting members, the embossing roller and the rubber roller are arranged on the film conveying frame, the two limiting members are connected to the film conveying frame and are respectively connected to the two baffles to limit the relative movement of the two baffles.

[0011] In one of the embodiments, the limiting member comprises an elastic member, one end of the elastic member is connected to the film conveying frame and the other end is connected to the outer side of the baffle to apply a pushing force to the baffle.

[0012] In one of the embodiments, the limiting member further comprises a limiting column, one end of the limiting column is connected to the film conveying frame and the other end is arranged through the baffle and is used to abut against the inner side of the baffle.

[0013] In one of the embodiments, the roller extruding gap comprises a first gap and two second gaps which are in communication with each other, the two second gaps are located on both sides of the first gap along the axial direction, and the size of the second gap in the radial direction of the embossing roller is greater than that of the first gap.

[0014] In one of the embodiments, the embossing roller comprises a first extruding section extending along the axial direction and a second extruding section coaxial with the first extruding section and located at both ends of the first extruding section, the diameter of the first extruding section is greater than that of the second extruding section; and / or,

[0015] The rubber roller comprises a third extruding section extending along the axial direction and a fourth extruding section coaxial with the third extruding section and located at both ends of the third extruding section, the diameter of the third extruding section is greater than that of the fourth extruding section.

[0016] In one of the embodiments, the length of the first extruding section is equal to that of the third extruding section, and the length of the second extruding section is equal to that of the fourth extruding section.

[0017] In one of the embodiments, the roller extruding gap further comprises two transition gaps, the transition gaps are respectively arranged between the first gap and the second gaps, the size of the two ends of the transition gap in the radial direction is equal to that of the first gap and the second gap respectively, and the size of the corresponding transition gap in the radial direction gradually decreases in the direction from the first gap to the second gap.

[0018] Advantages:

[0019] The packaging adhesive film forming extrusion equipment provided by the embodiment of the utility model includes an embossing assembly, an adhesive film extrusion die and two baffles; the embossing assembly includes at least one embossing roller and at least one rubber roller arranged side by side, and the embossing roller and the rubber roller have a roller gap for the adhesive film to flow through, and the embossing roller and the rubber roller can rotate relative to each other to extrude and form the adhesive film in the roller gap; the adhesive film extrusion die is arranged above the embossing roller, and the adhesive film extrusion die is used for extruding the adhesive film to the roller gap; the two baffles are arranged in the axial direction of the embossing roller at intervals, and the two baffles are used for abutting against the edges on both sides of the adhesive film respectively. In the application, the adhesive film extrusion die extrudes the adhesive film into the roller gap, and the embossing roller and the rubber roller rotate relative to each other to extrude and form the adhesive film in the roller gap, and since the two baffles are arranged in the axial direction of the embossing roller at intervals and abut against the edges on both sides of the adhesive film respectively, the embossing roller and the rubber roller can compact the edges of the adhesive film, the thickness of the edges of the adhesive film is uniform, and the damage and the broken pieces of the battery piece edges caused by the pressure are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Part of the schematic diagram of the packaging adhesive film forming extrusion equipment provided by an embodiment of the utility model.

[0021] Figure 2 Part of the schematic diagram of the cooperation of the baffle and the embossing roller in the packaging adhesive film forming extrusion equipment provided by an embodiment of the utility model.

[0022] Figure 3 Part of the schematic diagram of the packaging adhesive film forming extrusion equipment provided by an embodiment of the utility model after removing the baffle.

[0023] Figure 4 Part of the front view of the packaging adhesive film forming extrusion equipment provided by an embodiment of the utility model.

[0024] REFERENCE NUMERALS:

[0025] 100 - embossing assembly; 110 - embossing roller; 111 - first extrusion section; 112 - second extrusion section; 120 - rubber roller; 121 - third extrusion section; 122 - fourth extrusion section; 130 - roller gap; 131 - first gap; 132 - second gap; 200 - adhesive film extrusion die; 300 - baffle; 310 - first through hole; 320 - second through hole; 410 - adhesive film conveying frame; 420 - limiting piece; 421 - elastic piece; 422 - limiting column. DETAILED DESCRIPTION

[0026] In order to make the above object, characteristics and advantages of the present application more apparent, concrete embodiments of the present application will be described in detail with reference to the drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners without departing from the spirit of the present application. Those skilled in the art will appreciate the scope of the present application and can make similar modifications without departing from the spirit of the present application. Therefore, the present application is not limited by the embodiments disclosed below.

[0027] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0029] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0031] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0032] Reference Figure 1 , Figure 1 Part of the schematic diagram of the packaging adhesive film forming extrusion equipment provided by an embodiment of the present application. An embodiment of the present application provides a packaging adhesive film forming extrusion equipment, which comprises an embossing assembly 100, an adhesive film extrusion die 200 and two baffles 300. The embossing assembly 100 comprises at least one embossing roller 110 and at least one rubber roller 120 arranged side by side, and the embossing roller 110 and the rubber roller 120 have a roller gap 130 for the adhesive film to flow through, and the embossing roller 110 and the rubber roller 120 can rotate relative to each other to extrude and form the adhesive film in the roller gap 130. The adhesive film extrusion die 200 is arranged above the embossing roller 110, and the adhesive film extrusion die 200 is used to extrude the adhesive film to the roller gap 130. The two baffles 300 are arranged along the axial direction of the embossing roller 110, and the two baffles 300 are respectively used to abut the edges on both sides of the adhesive film.

[0033] Specifically, the adhesive film extrusion die 200 in the present application extrudes the adhesive film into the roller gap 130, and the embossing roller 110 and the rubber roller 120 rotate relative to each other to extrude and form the adhesive film in the roller gap 130. Since the two baffles 300 are arranged along the axial direction of the embossing roller 110, and the two baffles 300 abut the edges on both sides of the adhesive film, the embossing roller 110 and the rubber roller 120 can compact the edges of the adhesive film, so that the thickness of the edges of the adhesive film is uniform, thereby improving the damage and fragmentation of the edges of the battery piece due to pressure.

[0034] It should be noted that the axial direction of the embossing roller 110 and the rubber roller 120 is the same in the embodiment, and for the convenience of description, the axial direction and the radial direction are described in the following embodiments, wherein the axial direction and the radial direction are the axial direction and the radial direction of the embossing roller 110.

[0035] Referring to Figure 1 and Figure 2 , Figure 2 Part of the baffle and embossing roller cooperation in the packaging film forming extrusion equipment provided by the embodiment of the utility model is shown in the figure. In one embodiment, the baffle 300 abuts against the film covering surface of the embossing roller 110 and the rubber roller 120, and can move axially relative to the embossing assembly 100.

[0036] Specifically, the baffle 300 can move axially relative to the embossing assembly 100, and the baffle 300 abuts against the edge of the film, so as to adjust the width of the film to adapt to various film processes, thereby improving the adaptability of the packaging film forming extrusion equipment.

[0037] Among them, the baffle 300 abuts against the wheel surface of the embossing roller 110 and the rubber roller 120, so as to limit the overflow of the film outside the baffle 300, to stabilize the compaction of the film edge, and to guide the axial movement of the baffle 300 relative to the embossing assembly 100, so that the baffle 300 moves stably along the axial direction.

[0038] Referring to Figure 1 and Figure 2 In one embodiment, the baffle 300 has a first through hole 310, the embossing roller 110 is arranged in the first through hole 310 and abuts against the hole wall of the first through hole 310, so as to guide the axial movement of the baffle 300 relative to the embossing assembly 100, and to limit the position of the baffle 300, so that the two baffles 300 are stably arranged at both ends of the roller pressing gap 130.

[0039] Referring to Figure 1 and Figure 2 In another embodiment, the baffle 300 has a second through hole 320, the rubber roller 120 is arranged in the second through hole 320 and abuts against the hole wall of the second through hole 320, so as to guide the axial movement of the baffle 300 relative to the embossing assembly 100, and to limit the position of the baffle 300, so that the two baffles 300 are stably arranged between the roller pressing gaps 130.

[0040] Referring to Figure 1 and Figure 2 In yet another embodiment, the baffle 300 has a first through hole 310 and a second through hole 320, the embossing roller 110 is arranged in the first through hole 310 and abuts against the hole wall of the first through hole 310, and the rubber roller 120 is arranged in the second through hole 320 and abuts against the hole wall of the second through hole 320.

[0041] Referring to Figure 1 , Figure 2 and Figure 4 , Figure 4 Part of the main view of the packaging adhesive film forming extrusion equipment provided by an embodiment of the present application. In one embodiment, the packaging adhesive film forming extrusion equipment further comprises an adhesive film conveying frame 410 and two limiting members 420, the embossing roller 110 and the rubber roller 120 are arranged on the adhesive film conveying frame 410, and the two limiting members 420 are connected to the adhesive film conveying frame 410 and are respectively connected to the two baffles 300 to limit the relative movement of the two baffles 300.

[0042] Specifically, when the position of the baffle 300 relative to the embossing assembly 100 changes, the limiting member 420 is connected to the baffle 300, thereby limiting the relative movement of the two baffles 300, so that the baffle 300 can stably abut against the edge of the adhesive film, so that the edge of the adhesive film is stably compacted, the thickness of the edge of the adhesive film is uniform, and the reliability of the packaging adhesive film forming extrusion equipment is improved.

[0043] Referring to Figure 1 , Figure 2 and Figure 4 , in one embodiment, the limiting member 420 comprises a resilient member 421, one end of the resilient member 430 is connected to the adhesive film conveying frame 410, and the other end is connected to the outer side of the baffle 300 to apply a pushing force to the baffle 300.

[0044] Specifically, the opposite sides of the two baffles 300 are connected to the resilient member 421 and are subjected to a pushing force to approach each other, thereby stably limiting the two baffles 300 from moving away from each other, so that the baffle 300 stably abuts against the edge of the adhesive film to ensure the width of the edge of the adhesive film, and the reliability of the packaging adhesive film forming extrusion equipment is improved. Preferably, the resilient member 430 is a spring.

[0045] Referring to Figure 1 , Figure 2 and Figure 4 , in one embodiment, the limiting member 420 further comprises a limiting column 422, one end of the limiting column 422 is connected to the adhesive film conveying frame 410, and the other end is provided in the baffle 300 and is used to abut against the inner side of the baffle 300.

[0046] Specifically, the limiting column 422 comprises a threaded stud and a nut, the threaded stud is provided in the baffle 300 and the adhesive film conveying frame 410, the end of the threaded stud abuts against the side of the two baffles 300 that approaches each other, and the nut is threadedly connected with the threaded stud and abuts against the adhesive film conveying frame, thereby limiting the two baffles 300 from approaching each other. When it is necessary to adjust the position of the baffle 300, the nut can be loosened, and after the position of the baffle 300 is fixed, the nut is locked to stably limit the relative position of the two baffles 300.

[0047] Referring to Figure 1 , Figure 2 and Figure 3 , Figure 3 Part of the schematic diagram of the encapsulation adhesive film forming extrusion equipment after removing the baffle provided in an embodiment of the present application. In one of the embodiments, the rolling gap 130 includes a first gap 131 and two second gaps 132 which are in communication with each other, and the two second gaps 132 are located on both sides of the first gap 131 along the axial direction, and the size of the second gap 132 in the radial direction of the embossing roller 110 is greater than that of the first gap 131.

[0048] Specifically, the first gap 131 is located in the middle region of the rolling gap 130, and the second gap 132 is located in the edge region of the rolling gap 130. Since the size of the second gap 132 in the radial direction of the embossing roller 110 is greater than that of the first gap 131, the edge region of the extruded adhesive film is thicker than the middle region, so that the adhesive film formed in this way can improve the problem of short circuit of the edge of the photovoltaic module caused by the too thin lamination thickness of the adhesive film, and improve the problem of edge cracking of the photovoltaic module, and at the same time, it can also weaken the tension between the front and back glasses during the aging process of the photovoltaic module, and enhance the heat shock resistance and fatigue resistance of the module.

[0049] Referring to Figure 1 , Figure 2 and Figure 3 In one of the embodiments, the embossing roller 110 includes a first extrusion section 111 extending along the axial direction, and a second extrusion section 112 coaxial with the first extrusion section 111 and located at both ends of the first extrusion section 111, and the diameter of the first extrusion section 111 is greater than that of the second extrusion section 112.

[0050] Specifically, the first extrusion section 111 is located in the middle region of the embossing roller 110, and the second extrusion section 112 is located in the edge region of the embossing roller 110. Since the diameter of the first extrusion section 111 is greater than that of the second extrusion section 112, the size of the second gap 132 in the radial direction of the embossing roller 110 is greater than that of the first gap 131, so that the thickness of the edge region of the adhesive film is greater than that of the middle region of the adhesive film.

[0051] Referring to Figure 1 , Figure 2 and Figure 3 In another embodiment, the rubber roller 120 includes a third extrusion section 121 extending along the axial direction, and a fourth extrusion section 122 coaxial with the third extrusion section 121 and located at both ends of the third extrusion section 121, and the diameter of the third extrusion section 121 is greater than that of the fourth extrusion section 122.

[0052] Specifically, the third extrusion section 121 is located in the middle region of the rubber roller 120, and the fourth extrusion section 122 is located in the edge region of the rubber roller 120. Since the diameter of the third extrusion section 121 is larger than the diameter of the fourth extrusion section 122, the size of the second gap 132 in the radial direction of the embossing roller 110 is larger than the size of the first gap 131, so that the thickness of the edge region of the rubber film is larger than the thickness of the middle region of the rubber film.

[0053] Referring to Figure 1 , Figure 2 and Figure 1 , in another embodiment, the embossing roller 110 includes a first extrusion section 111 extending in the axial direction, and a second extrusion section 112 coaxial with the first extrusion section 111 and located at both ends of the first extrusion section 111. The diameter of the first extrusion section 111 is larger than the diameter of the second extrusion section 112. The rubber roller 120 includes a third extrusion section 121 extending in the axial direction, and a fourth extrusion section 122 coaxial with the third extrusion section 121 and located at both ends of the third extrusion section 121. The diameter of the third extrusion section 121 is larger than the diameter of the fourth extrusion section 122. The front and back surfaces of the extrusion-formed rubber film are both formed in a state that the edge region is thicker than the middle region, so as to effectively increase the thickness of the edge region of the rubber film.

[0054] Referring to Figure 2 and Figure 1 , in one of the embodiments, the length of the first extrusion section 111 is equal to the length of the third extrusion section 121, and the length of the second extrusion section 112 is equal to the length of the fourth extrusion section 122. That is, the region with a larger diameter in the embossing roller 110 corresponds to the region with a larger diameter in the rubber roller 120, and the region with a smaller diameter in the embossing roller 110 corresponds to the region with a smaller diameter in the rubber roller 120. After the extrusion forming, the thickened regions of the front and back surfaces of the rubber film are consistent.

[0055] Referring to Figure 2 and Figure 3 , in one of the embodiments, the roller pressing gap 130 further includes two transition gaps. The two transition gaps are respectively arranged between the two second gaps 132 and the first gap 131. The sizes of the two ends of the transition gap in the radial direction are respectively equal to the sizes of the first gap 131 and the second gap 132, and the size of the corresponding transition gap in the radial direction gradually decreases in the direction from the first gap 131 to the second gap 132, so as to play a transition role and avoid stress concentration at the connection between the middle region and the edge region of the extrusion-formed rubber film, thereby avoiding damage and fragmentation of the edge of the cell in the lamination process of the encapsulation rubber film used in the photovoltaic module packaging process due to stress concentration.

[0056] Referring to ​ , ​ and ​In one of the embodiments, the radius of the embossing roller 110 is greater than the radius of the rubber roller 120, so as to increase the time for the rubber film to adhere to the embossing roller 110, facilitate the cooling of the rubber film, and make the extrusion of the rubber film more stable.

[0057] The technical features of the above embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in contradictions.

[0058] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A packaging film forming and extrusion device, characterized in that, The encapsulation film forming and extrusion equipment includes: An embossing assembly, comprising at least one embossing roller and at least one rubber roller arranged side by side, wherein there is a roller gap between the embossing roller and the rubber roller for the flow of rubber film, and the embossing roller and the rubber roller are rotatable relative to each other to extrude the rubber film within the roller gap into shape; A film extrusion die, disposed above the embossing roller, the film extrusion die being used to extrude the film into the roller gap; and, Two baffles are provided, spaced apart along the axial direction of the embossing roller, and the two baffles are respectively used to abut against the edges of the adhesive film on both sides.

2. The encapsulation film forming and extrusion equipment according to claim 1, characterized in that, The baffle abuts against the film-coated surfaces of both the embossing roller and the rubber roller, and is capable of moving relative to the embossing assembly along the axial direction.

3. The encapsulation film forming and extrusion equipment according to claim 2, characterized in that, The baffle has a first through hole, the embossing roller passes through the first through hole and abuts against the wall of the first through hole; and / or, the baffle has a second through hole, the rubber roller passes through the second through hole and abuts against the wall of the second through hole.

4. The encapsulation film forming and extrusion equipment according to claim 2, characterized in that, The encapsulation film forming extrusion equipment also includes a film conveying frame and two limiting members. The embossing roller and the glue roller are disposed on the film conveying frame. The two limiting members are connected to the film conveying frame and are respectively used to connect to the two baffles to restrict the relative movement of the two baffles.

5. The encapsulation film forming and extrusion equipment according to claim 4, characterized in that, The limiting member includes an elastic member, one end of which is connected to the film conveying frame and the other end is connected to the outside of the baffle to apply a pushing force to the baffle.

6. The encapsulation film forming and extrusion equipment according to claim 4, characterized in that, The limiting component also includes a limiting post, one end of which is connected to the film conveying frame, and the other end passes through the baffle and is used to abut against the inner side of the baffle.

7. The encapsulation film forming and extrusion equipment according to any one of claims 1-6, characterized in that, The roller gap includes a first gap and two second gaps that are interconnected. The two second gaps are located on both sides of the first gap along the axial direction, and the size of the second gaps in the radial direction of the embossing roller is larger than that of the first gap.

8. The encapsulation film forming and extrusion equipment according to claim 7, characterized in that, The embossing roller includes a first extrusion section extending along the axial direction, and a second extrusion section coaxial with the first extrusion section and located at both ends of the first extrusion section, wherein the diameter of the first extrusion section is larger than the diameter of the second extrusion section; and / or, The rubber roller includes a third extrusion section extending along the axial direction, and a fourth extrusion section coaxial with the third extrusion section and located at both ends of the third extrusion section, wherein the diameter of the third extrusion section is larger than the diameter of the fourth extrusion section.

9. The encapsulating film forming and extrusion equipment according to claim 8, characterized in that, The length of the first extrusion section is equal to the length of the third extrusion section, and the length of the second extrusion section is equal to the length of the fourth extrusion section.

10. The encapsulation film forming and extrusion equipment according to claim 7, characterized in that, The rolling gap also includes two transition gaps. The two second gaps are respectively provided between the first gap and the second gap. The two ends of the transition gap are equal in radial dimension to the first gap and the second gap, respectively. In the direction from the first gap to the second gap, the corresponding transition gap gradually decreases in radial dimension.

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