CN108438384B

CN108438384B - Method for folding end folding piece of packaging piece

Info

Publication number: CN108438384B
Application number: CN201810230599.6A
Authority: CN
Inventors: 朱双海
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-01-21
Filing date: 2014-01-21
Publication date: 2020-04-10
Anticipated expiration: 2034-01-21
Also published as: CN104787404A; CN104787404B; CN108438384A

Abstract

A method of folding a package end flap comprising the steps of: when the packs are fed from the supply platform (21), the packs (3) are supported by the blades (28) of the chain links (35) of the latter station and the bottom of their end flaps (14) come into contact with the guide surfaces (38c) of the auxiliary flaps (38); as the station chain link (35) pushes the package (3) to be close to the blade (28) of the previous station chain link along with the movement process of the station chain link (35) from the C-shaped part (32) to the linear top branch (30), the contact area between the end folding piece (14) and the guide surface (38C) of the auxiliary folding piece (38) is gradually increased; when the station link (35) on which the pack (3) is placed leaves the supply platform (21), one side of the end flap (14) is completely applied to the guide surface (38c) and is folded backwards with respect to the direction of advance of the endless articulated chain (27) and finally onto the end wall (9).

Description

Method for folding end folding piece of packaging piece

Technical Field

The present application is a divisional application entitled chain conveyor with application number 201410027139.5.

The present invention relates to a method of folding a package into a packaging container, and in particular to a method of folding an end flap of a package.

Background

At present, many pourable food products, such as milk, beverages, juices, etc., are marketed for filling into package elements made of sterilized packaging material. A typical example of such a package is a parallelepiped-shaped package, which is made by folding and sealing a laminated strip packaging material. The packaging material has a multilayer structure comprising a layer of fibrous material, such as paper; and covering both layers with a layer of thermoplastic material, such as polyethylene; and a barrier layer, such as aluminum foil, on the side of the packaging material eventually contacting the food product; and applying one or more layers of heat-seal plastic material over the barrier layer to ultimately form the inside of the package in contact with the food product.

As is known, packages of the above type are produced in fully automatic packaging machines, on which a continuous tube is formed from a web-form feed of packaging material. The web-shaped packaging material is sterilized on the packaging machine, for example, by applying a chemical sterilizing agent, for example a hydrogen peroxide solution, which is removed after the treatment and evaporated from the surface of the packaging material by heating. While the sterilized packaging material is maintained in a closed, sterilized environment and is folded and sealed longitudinally to form a vertical tube.

The tube of packaging material is then filled with the food product to be packaged, sealed at equally spaced transverse portions, and cut along these transverse portions into a number of pillow packs 3 (fig. 1), which are then fed to a folding device where they are folded mechanically to form respective packages, for example substantially parallelepiped packages.

As shown in fig. 1 and 2, each pack 3 has a longitudinal sealing band 4, extending along one side of each pack 3, which is sealed at the opposite ends by respective transverse sealing bands 5, 6, which transverse sealing bands 5, 6 are perpendicular to and connected to longitudinal sealing band 4.

Each pack 3 has an axis parallel to longitudinal sealing band 4 and comprises a main portion 7 of parallelepiped shape; and respectively opposite top 8 and bottom 9 ends tapering from main portion 7 towards respective transverse sealing bands 5, 6

More specifically, main portion 7 of each pack 3 is laterally delimited by two planar rectangular walls 10 parallel to each other and to the axis, and by two planar rectangular walls 11 extending perpendicularly between planar rectangular walls 10.

Each

end wall

8, 9 is defined by a pair of walls 12 substantially in the shape of an isosceles trapezium, the walls 12 being slightly inclined towards each other with respect to a plane perpendicular to axis a and having a rectangular side defined by the respective edges of wall 10 of main portion 7, and a long side interconnected by respective sealing lines 5, 6.

Longitudinal sealing band 4 extends between transverse sealing band 5 and transverse sealing band 6, and along all of one planar rectangular wall 10 and along a corresponding pair 12 located on the same side as planar rectangular wall 10.

Each transverse sealing band 5, 6 forms a respective substantially elongated

rectangular end flap

13, 14, which end

flap

13, 14 projects from the relative package 3 in the direction of axis a; and forms two substantially

triangular flaps

15, 16, which flaps 15, 16 project laterally on opposite sides of the main portion 7 and are defined by the ends of the opposite walls 12.

To form packaging container 2, the folding device flattens

end portions

8, 9 of opposite packages 3 downwards towards each other and folds

respective end flaps

13, 14 onto

end portions

8, 9.

Chinese patent specification CN1105667C discloses a high-speed folding device for a machine for packaging pourable food products, as shown in fig. 3, the device comprising: a feeding station 22 for feeding a succession of sealed pillow-shaped packages 3 containing said food products, each having a plurality of folding

portions

15, 16, ready to be folded and sealed on

respective walls

12, 11 of the packages 3 to form respective parallelepiped-shaped packages 2; a conveying mechanism 21 for feeding said packages 3 along a forming path B extending from said feeding station 22 to an outfeed station 23; folding means 24, 25, 26, arranged along said forming path B and cooperating with each of said packs 3 to perform a respective folding operation of a pack 3; heating means 27 acting on said folded

portions

15, 16 of each pack 3 to melt said folded

portions

15, 16 and seal them against the

respective walls

12, 11; a final pressing mechanism 28 cooperating with each of said packs 3 to fix the respective folded

portion

15, 16 to the

respective wall

12, 11 when said folded

portion

15, 16 cools; said conveying means 21 are continuous and consist of an endless conveyor comprising a plurality of pushing members 32 for respective said packages 3, a

conveying section

33, 35a, 36a for feeding said pushing members 32 and said packages 3 along said forming path B, and a return section 34, 35B, 36B for feeding said pushing members 32 from said outfeed station 23 to said feed station 22; whereas said folding means 24, 25, 26 and said pressing means 28 comprise a plurality of interacting

elements

44, 50, 55, 58, 70, 71, 72, of fixed dimensions, interacting with said packs 3 and cooperating with said packs 3 by means of the movement of said conveying means 21; on the frame there is also a part 90, the flap 14 being folded over the end portion 7 and the end portion 7 being flattened when the pack 3 is slid against the part 90. The conveying means 21 of this folding device only serve to convey the packs 3, the function of folding the flaps 14 onto the end portions 7 requiring the component 90 to be completed is complex.

Chinese patent specification CN100556760C discloses a folding unit for a pourable food product packaging machine, as shown in fig. 4, for producing packages 2 of pourable food products from sealed packages 3, having a longitudinal axis a and having at least one end flap 14 to be folded, end flap 14 projecting in the direction of the aforesaid axis; folding unit 1 has at least one conveying

member

35, 28, conveying

member

35, 28 receiving cyclically opposite pack 3 through an end opposite end tab 14 and in a feeding direction C coaxial with said longitudinal axis a, and conveying

member

35, 28 feeding pack 3 along a forming path B crosswise to longitudinal axis a of pack 3; and folding means 24, which interact with each pack 3 along said forming path B to fold opposite end flaps 14 onto bottom end 9 of pack 3; folding mechanism 24 comprises an impact surface 43, impact surface 43 receiving each pack 3 by the end corresponding to end tab 14, and impact surface 43 is carried by conveying

members

35, 28 to move between a first operating position, in which impact surface 43 forms an angle greater than 90 degrees with respect to feed direction C of relative pack 3, opening towards forming path B, so as to fold relative end tab 14 onto pack 3 along forming path B in the travelling direction of the pack, in response to an impact on relative end tab 14, and a second operating position, in which impact surface 43 turns towards pack 3 and cooperates with pack 3 to complete the folding of relative end tab 14 on said pack 3. Such a folding unit belongs to the type of chain conveyor, the impact surface of which completes the folding of the end flaps onto the end walls during the transfer of the packs from the infeed station to the outfeed station, however, the mechanisms for providing the folding mechanism on the conveyor member are complex and the end flaps are folded forward onto the end walls, and during the further advance of the packs with folding flaps, the folded end flaps are liable to be turned up with the folding device and affect the subsequent operations and thus the forming of the packs.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a simple method for folding the end folding piece of the packaging piece, so as to realize that the end folding piece of the packaging piece is folded backwards on the end wall in the process of conveying the packaging piece from the feeding station to the output station, ensure that the end folding piece cannot be turned up in the subsequent folding flap operation, ensure that the folding flap operation is smooth and the packaging piece forming effect is good.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method of folding end flaps of packages, conveying packages with end flaps by means of a chain conveyor from an infeed station to an outfeed station and folding the end flaps onto end walls to form packaging containers; the chain conveyor comprises a plurality of station chain links which are hinged to form an annular hinged chain, blades for clamping and pushing packages are fixed on a supporting surface of each station chain link, and a folding component is fixed on a frame and used for guiding end flaps of the top to be folded onto the end wall of the top; in the straight section, the distance between the blades of two adjacent station links is equal to the width L of the pack; the side surface of the joint part of the blade and the hinge part of the station chain link is provided with a notch; the conveyor further includes a secondary flap for guiding the folding of the bottom end flap onto the bottom end wall, the secondary flap being secured to the frame and extending into the slot; the supporting surface of the station chain link is provided with a strip-shaped boss, the height of the strip-shaped boss is set to be the same as the thickness of the auxiliary folding plate, so that when the auxiliary folding plate is arranged in the notch of the station chain link, the upper surface of the strip-shaped boss and the upper surface of the auxiliary folding plate can form a wide integral supporting surface; the auxiliary flap comprises a curved section a parallel to the C-shaped portion of the endless hinged chain and a horizontal section b parallel to the top branch of the endless hinged chain; the bending section a is used for guiding and pushing the end folding piece after the packaging piece is fed from the feeding station, so that the end folding piece is folded backwards in the advancing direction of the annular hinged chain; the horizontal section b is connected with the bent section a and is used for guiding the packages to move; the method of folding an end flap of a package comprises the steps of: when the pack is fed from the supply platform, the pack is supported by the blades of the chain links of the latter station and the bottom of its end flaps comes into contact with the guide surfaces of the auxiliary flaps; along with the movement process that the station chain link branches from the C-shaped part to the linear top part, the blade of the chain link at the next station pushes the packaging piece to be close to the blade of the chain link at the previous station, and the contact area between the end folding piece and the guide surface of the auxiliary folding plate is gradually increased; when the station link on which the pack is placed leaves the supply platform, one side of the end flap is completely applied to the guide surface and is folded backwards in the direction of advance of the endless articulated chain and finally onto the end wall.

As a modification of the above-described technical solution, the front end of the bent section a of the auxiliary flap is formed with a guide surface c for guiding the end flap to be shifted rearward in the advancing direction of the endless hinge chain.

As an improvement of the above technical solution, the guide surface c is inclined toward the center of the curved section a and smoothly and excessively connected with the outer surface of the curved section a.

As a modification of the above technical solution, an angle between the guide surface c and a tangent of an upper surface of the curved section a is 0 ° to 45 °.

As an improvement of the above technical solution, wherein the cross-sectional shape of the auxiliary flap is an ellipse, a parallelogram or a trapezoid; the blade is disposed at an intermediate position of the support surface of the station link.

As an improvement of the above technical solution, one side of the blade is provided with the notch, and one side of the frame is provided with the auxiliary folding plate extending into the notch.

As an improvement of the above technical solution, two side surfaces of the blade are respectively provided with the notches, and two sides of the frame are respectively provided with the auxiliary folding plates extending into the notches.

Compared with the prior art, the invention has the advantages that the end folding pieces are folded by the guide surfaces of the auxiliary folding plates on the chain conveyor, the folding process is simple, the folding flaps are operated smoothly, the end folding pieces cannot be turned up in the subsequent folding flap operation, and the forming effect of the packaging piece is good.

Drawings

Figure 1 is a perspective view of a package before folding.

Fig. 2 is a side view schematic of fig. 1.

Fig. 3 is a perspective view of a folding device for folding a package according to the prior art.

Figure 4 is a schematic view of a prior art chain conveyor for folding the bottom end flaps of packages.

Fig. 5 is a side schematic view of a chain conveyor of the present invention.

Fig. 6 is a schematic front view of a chain conveyor of the present invention with auxiliary flaps mounted to one side.

Fig. 7 is a perspective view of an auxiliary flap of the present invention.

FIG. 8 is a side schematic view of a first station link of a chain conveyor of the present invention.

FIG. 9 is a schematic elevational view of a first station link of a chain conveyor of the present invention.

FIG. 10 is a side schematic view of a second station link of a chain conveyor of the present invention.

FIG. 11 is a schematic elevational view of a second station link of the chain conveyor of the present invention.

FIG. 12 is a schematic elevational view of a third station link of the chain conveyor of the present invention.

Fig. 13 is a schematic view of the state in which packages are supplied from a supply station.

Fig. 14 is a schematic view of the end flap of the package in contact with the secondary flap.

Figure 15 is a schematic view of the end flaps of the package folded.

Figure 16 is a schematic view of the end of the package with the end flap folded over the end.

Detailed Description

For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.

With reference to fig. 5, the chain conveyor of the invention is intended to feed packages 3 from a supply station 21 onto an output station 22 (both shown schematically) continuously along a forming path B that is mainly linear and horizontal.

The chain conveyor comprises a driving gear 25, a driven gear 26 and an annular articulated chain 27; the endless articulated chain 27 is articulated by a plurality of station links 35 to form an endless chain, encircles the drive gear 25 and the driven gear 26, and meshes with the drive gear 25 and the driven gear 26.

The endless articulated chain 27 comprises a rectilinear horizontal top branch 30, a bottom branch 31 substantially parallel to the top branch 30, and two curved C-

shaped portions

32, 33, the C-

shaped portions

32, 33 being located at the two ends of the top branch 30 and the bottom branch 31, respectively, being arranged so as to be concave towards the top branch 30 and the bottom branch 31 and connecting the top branch 30 and the bottom branch 31 together to form an endless chain, the middle portions of the C-

shaped portions

32, 33 defining the supply platform 21 and the output platform 22, respectively.

The path B comprises a main portion B1, rectilinear, defined by the top branch 30 of the endless articulated chain 27, and a respective supply end B2 and output end B3, the supply end B2 and output end B3 being defined by respective

top portions

32a, 33a of the C-

shaped portions

32, 33, the

top portions

32a, 33a extending between the respective supply and

output platforms

21, 22 and the top branch 30. The top 32a of C-shaped portion 32, top branch 30, and top 33a of C-shaped portion 33 define a conveying portion of endless hinged chain 27 for conveying packages 3 from supply platform 21 to output platform 22. While the remaining portion 32b of C-shaped portion 32, bottom branch 31, and the remaining portion 33b of C-shaped portion 33 define the return portion of endless articulated chain 27 for returning station link 35 from output platform 22 to supply platform 21, so that endless articulated chain 27 can be cyclically operated to feed packages 3 continuously from supply platform 21 onto output platform 22, so that end flap 14 at the bottom end of packages 3 is folded onto end wall 9, end flap 13 at the top end of packages 3 is folded onto end wall 8 under the action of part 40 of folding device 23, and

end walls

8, 9 are flattened under the combined action of part 40 and station link 35 and auxiliary flap 38.

As shown in fig. 5 and 6, the outer lateral surface of the station link 35 of the endless articulated chain 27 is a flat rectangular surface forming a support surface, on the outer lateral surface of the station link 35 there being vertically fixed a paddle 28, the paddle 28 being intended to grip the planar rectangular wall 10 of the pack 3 and to push the pack 3 to feed the pack 3 along the path B, the distance between the paddles 28 of two adjacent links 35 being equal to the width L of the pack 3 (distance between the planar rectangular walls 10 of the pack 3 shown in fig. 2) at the top branch 30 of the straight section.

As shown in fig. 12, the vanes 28 are fixedly arranged on the supporting surface of the station link 35, and a notch 36 is opened at one side surface of the joint of the vane 28 and the hinge portion 37 of the station link 35, so that the notches 36 of all the vanes 28 on the endless hinge chain 27 on the conveying path B are connected to form a groove-shaped passage above the conveying portion, in which a supplementary flap 38 is arranged.

The cross-sectional shape of the secondary flap 38 is oval or parallelogram or trapezoidal, and the width of the secondary flap can be set according to the transverse width of the slot 36. As shown in fig. 7, the auxiliary flap 38 is divided into a two-part structure comprising a curved segment 38a parallel to the C-shaped portion 32 of the endless hinge chain 27 and a horizontal segment 38b parallel to the top branch 30 of the endless hinge chain 27; the curved section 38a is intended to guide and push the end flaps 14 after the supply of the packs 3 from the feeding station, so that the end flaps 14 are folded backwards in the direction of advance of the endless hinge chain 27; the horizontal segment 38B is connected to the curved segment 38a for guiding the packages 3 along the conveying path B. And the horizontal segment 38b ends at a position in front of the top portion 33a corresponding to the C-shaped portion 33; the curved section 38a extends downwards along the C-shaped portion 32 and forms a free end which ends at a position above the supply platform 21.

At the free end of the curved section 38a there is also formed a guide surface 38c which guides the end flap 14 to fold backwards in the direction of advance of the endless hinge chain 27, the guide surface 38c being a sloping surface sloping towards the centre of the curved section 38a, and the intersection of the guide surface 38c and the upper surface of the curved section 38a being rounded so as to form a smooth transition so as not to damage the end flap 14 during folding. The angle between the guide surface 38c and the tangent to the upper surface of the curved section 38a is preferably 0 ° to 45 °, although the angle between the guide surface 38c and the tangent to the upper surface of the curved section 38a may be an obtuse angle, and the object of the present invention can be achieved. And the distance between the free end of the auxiliary flap 38 and the rear side of the blade 28 of the preceding station link 35 at the supply end B2 is greater than or equal to the sum of the height H of the end flap 14 and its distance L2 from the front side of the package 3 when each package 3 is conveyed to the supply platform 21.

As shown in fig. 13 to 16, when supplying package 3 at supply platform 21, package 3 is supported by blade 28 of the subsequent station link 35 and the bottom of its end flap 14 comes into contact with guide surface 38C of auxiliary flap 38 after package 3 is fed from supply platform 21, as station link 35 moves from C-shaped portion 32 to linear top branch 30, blade 28 of subsequent station link 35 pushes package 3 closer to blade 28 of the previous station link, the contact area of end flap 14 with guide surface 38C of auxiliary flap 38 becomes gradually larger, and when station link 35 on which package 3 is placed leaves supply platform 21, one side of end flap 14 completely fits onto guide surface 38C and is folded back in the direction of advance of endless chain 27 and finally folds onto end wall 9.

The vanes 28 can be arranged in the middle of the supporting surface of the station chain link 35, and the arrangement mode enables the whole structure of the station chain link 35 to be simple, and the station chain link can be used as a standard component more conveniently, so that the production cost is reduced, and the station chain link can be maintained and used more conveniently without being afraid of being worn in the long-term use process.

Naturally, for better folding, as shown in fig. 8 and 9, it is also possible to provide notches 36 on both sides of the junction between the blades 28 and the hinges 37 of the station link 35, so that the front face of the station link 35 looks "i" shaped, and so that the notches 36 of all the blades 28 on the endless hinge chain 27 on the conveying path B are connected to form two recessed channels above the conveying portion, and to provide an auxiliary flap 38 in each of the two recessed channels, so that when the endless hinge chain 27 conveys the packages 3, the two auxiliary flaps 38 form two juxtaposed folding faces below the end wall 9 of each package 3, so as to obtain better folding when the end flaps 14 are folded.

Further, as shown in fig. 10 and 11, strip-shaped bosses 39 may be provided on the support surfaces of the station link 35 on both sides of the longitudinal middle portion of the support surface thereof, which are limited by the front and rear sides of the blade 28, respectively, and the height of the strip-shaped bosses 39 is set to be the same as the thickness of the auxiliary flap 38, so that when the auxiliary flap 38 is set in the notch 36 of the station link 35, the upper surface of the strip-shaped bosses 39 and the upper surface of the auxiliary flap 38 may form a wide integral support surface for obtaining a better folding effect when the end flap 14 is folded.

According to the structure of the chain conveyor, the blade 28 appears to be placed vertically at the main portion B1 of the path B and appears to be in a substantially horizontal position at the feeding platform 21 and the output platform 22. Each package 3 is placed on the conveyor with the end 9 in contact with the conveying portion of the endless articulated chain 27, one of the sides of the planar rectangular wall 10 rests on the blade 28 of the link 35 of the subsequent station, and the axis a is parallel to this blade 28, crossing the path B.

At the supply platform 21, each package 3 is fed onto the chain conveyor in a feeding direction C, coaxial with the axis a of the package 3, and at a horizontal input position of the supply platform 21, where the end 9 and the opposite end flap 14 are placed facing the conveying portion of the endless articulated chain 27. Similarly, each folded packaging container 2 is removed from the conveyor at a horizontal output position of output platform 22.

In summary, the embodiment of the invention provides a method for folding end flaps of a packaging machine, which comprises the steps of forming notches on blades, placing auxiliary folding plates in the notches, enabling the packaging piece to be supported by the blades of a chain link at a later station and enabling an end folding piece of the chain link to be contacted with the upper surface of the auxiliary folding plate, and enabling the end folding piece to gradually abut against the upper surface of the auxiliary folding plate and be folded backwards to an end wall along the process that the chain link at the later station moves from a C-shaped part to a linear top branch, wherein the blades of the chain link at the later station push the packaging piece to be close to the blades of the chain link at the earlier station, and the free end of the auxiliary folding plate is provided with a guide surface for guiding the folding of the end folding plate.

Claims

1. A method of folding end flaps of packages, conveying a package (3) having a top end flap (13) and a bottom end flap (14) by means of a chain conveyor from a feed station to an outfeed station and folding the top end flap (13) and the bottom end flap (14) onto end walls (8, 9) to form a packaging container (2); the chain conveyor comprises a plurality of station chain links (35) hinged to form an endless hinged chain (27), vanes (28) fixed to the supporting surface of the station chain links (35) for gripping and pushing the packages (3), and folding members (40) fixed to the frame for guiding the end flaps (13) of the top to be folded onto the end walls of the top; in a straight section, the distance between the blades (28) of two adjacent station links (35) is equal to the width L of the pack (3); a notch (36) is formed in the side surface of the joint of the blade (28) and the hinge part (37) of the station chain link (35); the chain conveyor further comprises an auxiliary flap (38) for guiding the folding of the bottom end flap (14) onto the bottom end wall (9), the auxiliary flap (38) being fixed to the frame and extending into the slot (36); the method is characterized in that:

the supporting surface of the station chain link (35) is provided with a strip-shaped boss (39), the height of the strip-shaped boss is set to be the same as the thickness of the auxiliary folding plate, so that when the auxiliary folding plate is arranged in the notch of the station chain link, the upper surface of the strip-shaped boss and the upper surface of the auxiliary folding plate can form a wide integral supporting surface; the auxiliary flap (38) comprises a curved section (38a) parallel to the C-shaped portion (32) of the endless articulated chain (27) and a horizontal section (38b) parallel to the top branch (30) of the endless articulated chain (27); the bending section (38a) is used for guiding and pushing the bottom end flap (14) after the package (3) is fed from the feeding station, so that the bottom end flap (14) is folded backwards in the advancing direction of the endless hinged chain (27); the horizontal section (38b) is connected with the curved section (38a) for guiding the package (3) to move;

the method of folding an end flap of a package comprises the steps of:

when the packs are fed from the supply platform (21), the packs (3) are supported by the blades (28) of the chain links (35) of the latter station and the bottom of the end flaps (14) of the bottom come into contact with the guide surfaces (38c) of the auxiliary flaps (38);

as the station chain link (35) moves from the C-shaped part (32) to the linear top branch (30), the leaf blade (28) of the next station chain link (35) pushes the package (3) to be close to the leaf blade (28) of the previous station chain link, and the contact area between the end folding piece (14) at the bottom and the guide surface (38C) of the auxiliary folding piece (38) is gradually increased;

when the station link (35) on which the pack (3) is placed leaves the supply platform (21), one side of the bottom end flap (14) is completely applied to the guide surface (38c) and is folded backwards with respect to the direction of advance of the endless articulated chain (27), and finally onto the end wall (9);

the front end of the bent section (38a) of the auxiliary flap (38) is formed with a guide surface (38c) for guiding the end flap (14) of the bottom portion to be deviated rearward in the advancing direction of the endless hinge chain (27).

2. The method of folding a package end flap of claim 1, wherein: the guide surface (38c) is inclined towards the circle center of the bent section (38a) and is smoothly and excessively connected with the outer surface of the bent section (38 a).

3. The method of folding a package end flap of claim 2, wherein: the angle between the guide surface (38c) and a tangent to the upper surface of the curved section (38a) is 0 DEG to 45 deg.

4. The method of folding a package end flap of claim 1, wherein: the cross section of the auxiliary folded plate (38) is oval, parallelogram or trapezoid;

the blade (28) is arranged in the middle of the support surface of the station link (35).

5. The method of folding a package end flap of claim 4, wherein: one side surface of the blade (28) is provided with the notch (36), and one side of the frame is provided with the auxiliary folded plate (38) extending into the notch (36).

6. The method of folding a package end flap of claim 4, wherein: the notches (36) are respectively formed in two side faces of the blade (28), and the auxiliary folded plates (38) extending into the notches (36) are respectively arranged on two sides of the rack.