EP4205925A1 - A knife, a filling machine and a method for filling and sealing a package - Google Patents
A knife, a filling machine and a method for filling and sealing a package Download PDFInfo
- Publication number
- EP4205925A1 EP4205925A1 EP22213363.9A EP22213363A EP4205925A1 EP 4205925 A1 EP4205925 A1 EP 4205925A1 EP 22213363 A EP22213363 A EP 22213363A EP 4205925 A1 EP4205925 A1 EP 4205925A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cutting
- knife
- notch
- tube
- tooth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 119
- 230000036346 tooth eruption Effects 0.000 claims abstract description 42
- 239000005022 packaging material Substances 0.000 claims abstract description 41
- 235000013305 food Nutrition 0.000 claims description 15
- 238000004806 packaging method and process Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 235000021056 liquid food Nutrition 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/01—Means for holding or positioning work
- B26D7/02—Means for holding or positioning work with clamping means
- B26D7/025—Means for holding or positioning work with clamping means acting upon planar surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/0006—Cutting members therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
- B26D7/2614—Means for mounting the cutting member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
- B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
- B65B9/10—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs
- B65B9/20—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles
- B65B9/213—Enclosing successive articles, or quantities of material, in preformed tubular webs, or in webs formed into tubes around filling nozzles, e.g. extruded tubular webs the webs being formed into tubes in situ around the filling nozzles the web having intermittent motion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/0006—Cutting members therefor
- B26D2001/0053—Cutting members therefor having a special cutting edge section or blade section
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/0006—Cutting members therefor
- B26D2001/006—Cutting members therefor the cutting blade having a special shape, e.g. a special outline, serrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/52—Details
- B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
- B65D75/5816—Opening or contents-removing devices added or incorporated during package manufacture for tearing a corner or other small portion next to the edge, e.g. a U-shaped portion
Definitions
- the invention relates to packaging technology. More particularly, it is related to a knife for cutting through packaging material, a filling machine comprising such knife and a method for filling and sealing a package.
- Roll-fed packaging machines are well known within the field of packaging, in particular in the field of liquid food packaging.
- a well-known example in the field of liquid food packaging is the filling machines, also referred to as packaging machines, introduced on the market in the 1940's by Tetra Pak ® .
- Tetra Pak ® A3 a reel of carton-based packaging material is received.
- a web of packaging material is unwound from the reel.
- the web After being sterilized, e.g. by using hydrogen peroxide, the web is formed into a tube. While holding the tube vertical it is filled with food product, e.g. milk, via a product filling pipe extending into an interior of the tube from above.
- Knives for providing perforated pattern are also known. By using such knife, a number of packages connected to each other is provided, i.e. a string of packages can be formed. Consumers can thereafter tear off package by package from the string along the perforated patterns between the packages formed by the knife.
- a knife for cutting through a body of packaging material at a transversal sealing area of the body.
- the knife comprises a serrated edge having a number of cutting teeth for cutting through the packaging material such that a first cut surface and a second cut surface of the packaging material are formed, a first and a second blade surface extending from a respective side of the serrated edge, and at least one attachment portion for fixing the knife to a cutting apparatus.
- the serrated cutting edge comprises a notch-cutting tooth arranged to cut out a notch in the first cut surface.
- an advantage with having the notch-cutting tooth such that the notch in the first cut surface can be provided is that the notch facilitates the opening of the package for a consumer. More particularly, the notch provides a starting point for tearing the package open. Having the possibility to form this notch at the same time as two subsequent packages are separated, and not in a separate device, provides for costefficiency. From an environmental standpoint, since the notch can form part of an opening arrangement of a package not involving any plastic material, an advantage with the knife is that this provides for that opening arrangements with low carbon footprints can be achieved.
- the notch-cutting tooth may be, as seen in a cutting direction of the knife, be longer than the cutting teeth.
- the notch-cutting tooth may be at least 25% longer than the than the cutting teeth.
- the notch-cutting tooth may be at least 1 mm longer than the cutting teeth.
- the notch-cutting tooth may comprise a first tooth surface that is flush with the first blade surface and extends, in the cutting direction of the knife, beyond the tip of an adjacent cutting teeth.
- notch-cutting tooth arranged in this way provides for that a distinct notch can be formed in the first cut surface. Further, by having the knife arranged in this way less difference in length between the notch-cutting tooth and the cutting teeth, that is, the other teeth of the serrated edge, is needed to form the notch.
- the notch-cutting tooth may comprise a second tooth surface that is flush with the second blade surface and extends, in the cutting direction of the knife, beyond the tip of an adjacent cutting teeth.
- the first tooth surface that is flush with the first blade surface may extend, in the cutting direction of the knife, at least 1 mm beyond the tip of an adjacent cutting teeth.
- the first tooth surface that is flush with the first blade surface may have a width D3, in a direction that is transverse to the cutting direction of the knife, that is at least 0,4 mm.
- the notch-cutting tooth may comprise a front edge that is slanted relative the cutting direction of the knife by an angle ⁇ within the range of 80°-100°.
- the cutting teeth may be single-beveled, with the bevel located on the same side as the first blade surface.
- the cutting teeth may comprise a respective front edge that is slanted relative the cutting direction of the knife by an angle that is within the range of 25°-65°.
- All cutting teeth may have the same length, or have a respective length that deviates at most 10% from a mean value of the lengths of the cutting teeth.
- the attachment portion may be arranged for fixing the knife to a cutting apparatus with the first blade surface upwards, such that it faces the uppermost cut surface of the first cut surface and a second cut surface of the packaging material.
- a filling machine for filling and sealing packages.
- the filling machine comprises a longitudinal sealing unit arranged to form a tube from a web of packaging material, a product filling pipe arranged to fill food product into the tube, and a cutting and sealing unit, comprising a cutting apparatus, arranged to transversally seal and cut the tube for forming individual packages filled with the food product.
- the cutting and sealing unit comprises a knife according to the first aspect.
- the filling machine may further comprise a tube guiding unit arranged to guide the tube with respect to the knife such that a guiding line of the packaging material is aligned with the notch-cutting tooth of the knife.
- the tube guiding unit may be directed such that the notch, provided during cutting, is aligned with the guiding line provided in the packaging material before cutting, e.g. in a converting factory producing packaging material.
- a method for filling and sealing a package comprises forming the tube from a web of packaging material, filling food product into the tube, and transversally sealing and cutting the tube for forming individual packages filled with the food product.
- the cutting comprises cutting the tube with a knife according to the first aspect.
- the method may further comprise guiding the tube with respect to the knife such that a guiding line of the packaging material is aligned with the notch-cutting tooth of the knife.
- an advantage with having the tube guided with respect to the knife is that the tube may be directed such that the notch, provided during cutting, is aligned with the guiding line provided in the packaging material before cutting, e.g. in a converting factory producing packaging material.
- Fig. 1 illustrates an upper part of a package 100 by way of example.
- the package 100 can be a carton package, that is, a package made of a carton-based packaging material 101.
- the package 100 comprises a top fin 102 and a main body 104 in which food product is held. Even though not illustrated, a bottom fin may be provided in a similar way in an opposite end of the package 100.
- a transversal sealing 106 In the top fin 102 there is a transversal sealing 106.
- the transversal sealing 106 may be achieved in different ways. For instance, by using so-called induction heating, a current may be induced in the packaging material 101 such that plastic layers of the packaging material are melted. By pressing the tube together horizontally, the melted plastic layers of the packaging material 101 can be formed into the transversal sealing 106.
- the package 100 illustrated in Fig. 1 is provided with a notch 108.
- a benefit with having the notch 108 is that this can facilitate the opening of the package 100.
- the notch 108 provides for that a top edge of the top fin 102, also referred to as first cut surface 112, is split in two parts. This is advantageous in that when a consumer is grabbing one part of the top fin 102 with one hand and another part of top fin 102 with the other hand and the two parts are pulled apart, the notch 108 facilitates that the top fin 102 is torn where the notch 108 is located.
- By providing a notch 108 more controlled opening of the package 100 is achieved.
- elderly people or other persons with muscle constraint may be able to open the package 100 without the need for a pair of scissors or other tool.
- a guiding line 110 may be provided as a guide when tearing open the package 100, i.e. tearing the top fin 102 and part of the main body 104.
- the guiding line may be a line that has been printed on the package material, or may be a perforated line, a crease line or a line formed by a plastic material.
- the guiding line 110 is a crease line or semi-perforated line it also acts as a weakening line.
- the weakening line may be provided by a number of perforations placed after one another in a carton layer of the packaging material 101.
- the packaging material 101 may comprise at least an inner plastic layer and an outer plastic layer between which the carton layer is laminated.
- a transversal sealing unit that is, a cutting and sealing unit 809, as illustrated in Fig. 2 and also in Fig. 11 , may be used.
- the transversal sealing unit 809 may be placed downstream a longitudinal sealing unit 804 in which a web of packaging material 101 is folded into a tube and provided with a longitudinal sealing such that the tube is formed.
- the top fin 102 and the bottom fin may be formed at the same time.
- a heat sealing unit 502 e.g. an inductor
- the anvil 504 may be provided with two dollies 506a,b placed vertically apart. Between the two dollies 506a,b, room is provided for a cutting apparatus 500 comprising a knife 200. This knife 200 can be fed through a horizontal channel 510 of the anvil 504 in a cutting direction C through the tube 201 and into a groove 508 provided in the heat sealing unit 502.
- the cutting direction C is the direction that is transverse to the direction L along which an edge of the knife 200 extends.
- the cutting direction C is the direction that is transverse to the direction L along which the serrated edge extends.
- the cutting direction may then also be the direction along which the cutting teeth 211, 214 of the serrated edge extend.
- transversal sealing unit other types of cutting and sealing units 809 may also be used.
- other types of sealing technology may also be used, e.g. ultrasonic sealing.
- the cutting apparatus 500 comprising the knife 200 and a motor for moving this back and forth can be provided as a separate device downstream a transversal sealing device comprising the heat sealing unit 502, the anvil 504 and a motor for moving the two between a closed and an open state.
- Fig. 3 illustrates a perspective view of the knife 200 and the tube 201 in isolation before cutting, that is, before the knife 200 divides the tube 201 in the transversal sealing area 207.
- the knife 200 may be seen as a cutting blade provided with a spine 203, facing away from the tube 201 during cutting, and a serrated edge 210 facing the tube 201 during cutting and extending in a longitudinal extension L perpendicular to the cutting direction C.
- a first blade surface 204 may be facing upwards and a second blade surface 206 may be facing downwards.
- attachment portions 208a,b herein exemplified as holes, may be provided.
- the serrated edge 210 has cutting teeth 211 and to provide for that the notch 108 can formed during the cutting, a notch-cutting tooth 212 is provided. As illustrated in Fig. 3 and more in detail in Fig. 8 , the notch-cutting tooth 212 may be longer, as seen in the cutting direction C, than the cutting teeth 211.
- Fig. 4 illustrates another perspective view of the knife 200 and the tube 201 in isolation, but after the cutting has been made.
- the notch 108 can be formed in the package 100.
- a second cut surface 218, i.e. a bottom edge, is also formed. Even though the packages 100 are formed upside down in the example illustrated, it is also possible to form the packages upright.
- the knife 200 can be mounted securely such that a placement of the notch 108 in the first cut surface 112 can be controlled in detail.
- the attachment portions 208a,b may be arranged such that the knife 200 can only be mounted with the first blade surface 204 facing upwards, thereby reducing the risk that the notch 108 is incorrectly provided in the second cut surface 218, i.e. in the bottom fin of the package 100.
- Fig. 5 illustrates the knife 200 in further detail.
- the notch-cutting tooth 212 can be longer than the cutting teeth 211, 214 of the serrated edge 210.
- the notch-cutting tooth 212 may be at least 25% longer that the cutting teeth 211, 214.
- a difference in length between the notch-cutting tooth 212 and the cutting teeth 211, 214 may be at least 1 mm.
- the knife 200 may be single-beveled.
- the cutting teeth 211, 214 may be single-beveled with a bevel placed on the first blade surface 204.
- the cutting teeth 2111, 214 may be of equal length, that is, all teeth but the notch-cutting tooth 212 of the serrated edge 210 may be of equal length. In case the cutting teeth 211 are not of equal length, they may all differ less than ⁇ 5% in length from a mean length of the cutting teeth 211, 214.
- Fig. 6 illustrates the knife 200 seen from above with the first blade surface 204 facing upwards, that is, in accordance with how the knife is arranged in the transversal sealing unit 500 illustrated in Fig. 2 .
- Fig. 7 illustrates the knife 200 seen from below, showing the second blade surface 206.
- Fig. 8 illustrates the notch-cutting tooth 212 and adjacent cutting teeth 211, 214 in further detail.
- the notch-cutting tooth 212 can comprise as first tooth surface 2121, which forms part of the first blade surface 204, or put differently is flush with the first blade surface 204. Further, the first tooth surface 2121 can be arranged to extend, in the cutting direction C, beyond a tip 2111 of an adjacent cutting tooth 211. The first tooth surface 2121 may extend at least 1 mm beyond the tip 2111 of the adjacent cutting tooth 211.
- the notch-cutting tooth 212 can further comprise a second tooth surface 2122 (see Fig. 7 and Fig. 9 ) that forms part of the second blade surface 206, or put differently is flush the second blade surface 206.
- the cutting tooth 212 may have a length D1, measured from base line BL of the serrated edge 210 to a notch-cutting tooth tip line NL, and the adjacent cutting teeth 211, 214 may have a length D2, measured from the base line BL to an end line EL, i.e. a cutting teeth tip line.
- the length D1 of the cutting tooth 212 may, as illustrated, be greater than the length D2 of the cutting teeth 211, 214. Further, as illustrated, all cutting teeth 211, 214 may have the same length D2.
- first tooth surface 2121 may have a width D3, in a direction L that is transverse to the cutting direction C, that is at least 0,4 mm.
- Fig. 9 illustrates a cross-sectional view along the line A-A illustrated in Fig. 6 .
- a front edge 2123 of the notch-cutting tooth 212 may be without bevel.
- the front edge 2123 may also be provided with a bevel, but less slanted than a bevel of the cutting teeth 211, 214 or a bevel on the second blade surface 206.
- the front edge 2123 may be slanted relative the cutting direction C by an angle ⁇ within the range 80° to 100°.
- Fig. 10 illustrates a cross-sectional view of a cutting tooth that is similar to the cutting teeth 211, 214, seen along the line B-B illustrated in Fig. 6 .
- the cutting tooth may comprise a respective front edge 2113 that is slanted relative the cutting direction C by and angle ⁇ that is within the range of 25°-65°.
- the cutting teeth 211, 214 adjacent the notch-cutting tooth 212 may be slanted in the same way.
- a filling machine 800 is illustrated.
- a web 802 of packaging material 101 can be provided, e.g. the web can be provided from a reel of packaging material.
- the web 802 can be formed into the tube 201 by directing the web 802 and also continuously provide a longitudinal sealing, i.e. attaching the two longitudinal edges of the web together.
- a longitudinal sealing unit 804 By holding the tube 201 vertical it is made possible to fill it with food product 807 via a product filling pipe 806.
- the tube 201 can be directed by a tube guiding unit 808 into the cutting and sealing apparatus 809, illustrated more in detail in Fig. 2 .
- the cutting and sealing apparatus 809 which also may be referred to as transversal sealing unit, may comprise one or several motors 810 arranged for moving the heat sealing unit 502 and the anvil 504 towards each other and away from each other during production of the packages 100.
- the anvil 504 is moved in an anvil direction D-A
- the heat sealing unit 502 is moved in a sealing unit direction D-S, opposite to the anvil direction D-A.
- the packages 100 are produced upside down with the first cut surface 112, in which the notch 108 is proved, facing downwards and the second cut surface 218 facing upwards.
- Fig. 12 is a flowchart illustrating a method 900 for filling and sealing the package 100.
- the tube 201 can be formed from the web of packaging material 101.
- the food product 807 can be filled into the tube 201.
- the packages 100 can be formed by transversally sealing the tube 201 and thereafter cutting the tube 201 into the packages 100. For cutting, the knife 200 described above can be used.
- the tube 201 can be guided with respect to the knife 200 such that the guiding line 110 of the packaging material 101 is aligned with the notch-cutting tooth 112 of the knife 200, thereby providing for that the notch 108 of the first cut surface 112 is aligned with the guiding line 110.
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- Auxiliary Devices For And Details Of Packaging Control (AREA)
Abstract
Description
- The invention relates to packaging technology. More particularly, it is related to a knife for cutting through packaging material, a filling machine comprising such knife and a method for filling and sealing a package.
- Roll-fed packaging machines are well known within the field of packaging, in particular in the field of liquid food packaging. A well-known example in the field of liquid food packaging is the filling machines, also referred to as packaging machines, introduced on the market in the 1940's by Tetra Pak®. In short, in these machines, today sold under the name Tetra Pak® A3, a reel of carton-based packaging material is received. Once docked to the filling machine, a web of packaging material is unwound from the reel. After being sterilized, e.g. by using hydrogen peroxide, the web is formed into a tube. While holding the tube vertical it is filled with food product, e.g. milk, via a product filling pipe extending into an interior of the tube from above. By continuously and transversally seal and cut off pieces from a lower end of the tube, packages filled with food product can be formed at an impressive speed.
- During the years the roll-fed packaging machines have been used, various knives for cutting off the packages have been applied. Today it is known to use a knife with a serrated edge. It is also known to have an edge with a raised mid-portion of the edge. By having this raised mid-portion, the tube of packaging material is first cut in a mid-section of the tube and thereafter the two peripheral ends of the tube are cut. Using the serrated edge in combination with having the mid-portion raised is known to provide for reliable cutting.
- All knives used for cutting have not been made for completely cutting off the packages. Knives for providing perforated pattern are also known. By using such knife, a number of packages connected to each other is provided, i.e. a string of packages can be formed. Consumers can thereafter tear off package by package from the string along the perforated patterns between the packages formed by the knife.
- Even though different knives for cutting a tube of packaging material to create individual packages is known, there is a need to provide improved knives that offer even better or added functionality during the packaging or for the package itself.
- It is an object of the invention to at least partly overcome one or more of the above-identified limitations of the prior art. In particular, it is an object to provide a knife that assists in providing a package that is easy to open for a consumer, but still can be produced cost-efficiently and in a food safe manner in a roll-fed packaging machine. Still an object is to present a knife that provides for that such package can be produced and that can be installed in existing filling machines.
- According to a first aspect it is provided a knife for cutting through a body of packaging material at a transversal sealing area of the body. The knife comprises a serrated edge having a number of cutting teeth for cutting through the packaging material such that a first cut surface and a second cut surface of the packaging material are formed, a first and a second blade surface extending from a respective side of the serrated edge, and at least one attachment portion for fixing the knife to a cutting apparatus. The serrated cutting edge comprises a notch-cutting tooth arranged to cut out a notch in the first cut surface.
- An advantage with having the notch-cutting tooth such that the notch in the first cut surface can be provided is that the notch facilitates the opening of the package for a consumer. More particularly, the notch provides a starting point for tearing the package open. Having the possibility to form this notch at the same time as two subsequent packages are separated, and not in a separate device, provides for costefficiency. From an environmental standpoint, since the notch can form part of an opening arrangement of a package not involving any plastic material, an advantage with the knife is that this provides for that opening arrangements with low carbon footprints can be achieved.
- The notch-cutting tooth may be, as seen in a cutting direction of the knife, be longer than the cutting teeth. The notch-cutting tooth may be at least 25% longer than the than the cutting teeth. The notch-cutting tooth may be at least 1 mm longer than the cutting teeth.
- The notch-cutting tooth may comprise a first tooth surface that is flush with the first blade surface and extends, in the cutting direction of the knife, beyond the tip of an adjacent cutting teeth.
- By having the notch-cutting tooth arranged in this way provides for that a distinct notch can be formed in the first cut surface. Further, by having the knife arranged in this way less difference in length between the notch-cutting tooth and the cutting teeth, that is, the other teeth of the serrated edge, is needed to form the notch.
- The notch-cutting tooth may comprise a second tooth surface that is flush with the second blade surface and extends, in the cutting direction of the knife, beyond the tip of an adjacent cutting teeth.
- The first tooth surface that is flush with the first blade surface may extend, in the cutting direction of the knife, at least 1 mm beyond the tip of an adjacent cutting teeth.
- The first tooth surface that is flush with the first blade surface may have a width D3, in a direction that is transverse to the cutting direction of the knife, that is at least 0,4 mm.
- The notch-cutting tooth may comprise a front edge that is slanted relative the cutting direction of the knife by an angle α within the range of 80°-100°.
- The cutting teeth may be single-beveled, with the bevel located on the same side as the first blade surface.
- The cutting teeth may comprise a respective front edge that is slanted relative the cutting direction of the knife by an angle that is within the range of 25°-65°.
- All cutting teeth may have the same length, or have a respective length that deviates at most 10% from a mean value of the lengths of the cutting teeth.
- The attachment portion may be arranged for fixing the knife to a cutting apparatus with the first blade surface upwards, such that it faces the uppermost cut surface of the first cut surface and a second cut surface of the packaging material.
- According to a second aspect it is provided a filling machine for filling and sealing packages. The filling machine comprises a longitudinal sealing unit arranged to form a tube from a web of packaging material, a product filling pipe arranged to fill food product into the tube, and a cutting and sealing unit, comprising a cutting apparatus, arranged to transversally seal and cut the tube for forming individual packages filled with the food product. The cutting and sealing unit comprises a knife according to the first aspect.
- The filling machine may further comprise a tube guiding unit arranged to guide the tube with respect to the knife such that a guiding line of the packaging material is aligned with the notch-cutting tooth of the knife.
- An advantage with having the tube guiding unit is that the tube may be directed such that the notch, provided during cutting, is aligned with the guiding line provided in the packaging material before cutting, e.g. in a converting factory producing packaging material.
- According to a third aspect it is provided a method for filling and sealing a package. The method comprises forming the tube from a web of packaging material, filling food product into the tube, and transversally sealing and cutting the tube for forming individual packages filled with the food product. The cutting comprises cutting the tube with a knife according to the first aspect.
- The method may further comprise guiding the tube with respect to the knife such that a guiding line of the packaging material is aligned with the notch-cutting tooth of the knife.
- As above, an advantage with having the tube guided with respect to the knife is that the tube may be directed such that the notch, provided during cutting, is aligned with the guiding line provided in the packaging material before cutting, e.g. in a converting factory producing packaging material.
- Still other objectives, features, aspects and advantages of the invention will appear from the following detailed description as well as from the drawings.
- Embodiments of the invention will now be described, by way of example, with reference to the accompanying schematic drawings, in which
-
Fig. 1 is a perspective view of an upper part of a package. -
Fig. 2 is a cross-sectional view of a transversal sealing unit. -
Fig. 3 is a perspective view of a knife and a tube before cutting. -
Fig. 4 is a perspective view of the knife and the tube ofFig. 3 after cutting. -
Fig. 5 is a perspective view of a knife. -
Fig. 6 is a top view of the knife ofFig. 5 . -
Fig. 7 is a bottom view of the knife ofFig. 5 . -
Fig. 8 is an enlarged view of a notch-cutting tooth of the knife ofFig. 5 . -
Fig. 9 is a cross-sectional view along line A-A inFig. 6 , showing the notch-cutting tooth. -
Fig. 10 is a cross-sectional view along line B-B inFig. 6 , showing a cutting teeth. -
Fig. 11 is a schematic view of a filling machine. -
Fig. 12 is a flowchart illustrating a method for filling and sealing the package. -
Fig. 1 illustrates an upper part of apackage 100 by way of example. Thepackage 100 can be a carton package, that is, a package made of a carton-basedpackaging material 101. - As illustrated, the
package 100 comprises atop fin 102 and amain body 104 in which food product is held. Even though not illustrated, a bottom fin may be provided in a similar way in an opposite end of thepackage 100. In thetop fin 102 there is atransversal sealing 106. Thetransversal sealing 106 may be achieved in different ways. For instance, by using so-called induction heating, a current may be induced in thepackaging material 101 such that plastic layers of the packaging material are melted. By pressing the tube together horizontally, the melted plastic layers of thepackaging material 101 can be formed into thetransversal sealing 106. - Unlike known food packages, the
package 100 illustrated inFig. 1 is provided with anotch 108. A benefit with having thenotch 108 is that this can facilitate the opening of thepackage 100. Put differently, thenotch 108 provides for that a top edge of thetop fin 102, also referred to asfirst cut surface 112, is split in two parts. This is advantageous in that when a consumer is grabbing one part of thetop fin 102 with one hand and another part oftop fin 102 with the other hand and the two parts are pulled apart, thenotch 108 facilitates that thetop fin 102 is torn where thenotch 108 is located. By providing anotch 108 more controlled opening of thepackage 100 is achieved. In addition, by providing thenotch 108, elderly people or other persons with muscle constraint may be able to open thepackage 100 without the need for a pair of scissors or other tool. - In addition, to facilitate for the consumer, a guiding
line 110 may be provided as a guide when tearing open thepackage 100, i.e. tearing thetop fin 102 and part of themain body 104. The guiding line may be a line that has been printed on the package material, or may be a perforated line, a crease line or a line formed by a plastic material. When the guidingline 110 is a crease line or semi-perforated line it also acts as a weakening line. The weakening line may be provided by a number of perforations placed after one another in a carton layer of thepackaging material 101. In addition to a carton layer, thepackaging material 101 may comprise at least an inner plastic layer and an outer plastic layer between which the carton layer is laminated. - When producing the
package 100 illustrated inFig. 1 , a transversal sealing unit, that is, a cutting and sealingunit 809, as illustrated inFig. 2 and also inFig. 11 , may be used. As illustrated inFig. 11 , thetransversal sealing unit 809 may be placed downstream alongitudinal sealing unit 804 in which a web ofpackaging material 101 is folded into a tube and provided with a longitudinal sealing such that the tube is formed. - By using the
transversal sealing unit 809, thetop fin 102 and the bottom fin may be formed at the same time. In the example illustrated, this is achieved by having aheat sealing unit 502, e.g. an inductor, placed on one side of atube 201 ofpackaging material 101, also referred to as body of packaging material, and ananvil 504 placed on opposite side. Theanvil 504 may be provided with twodollies 506a,b placed vertically apart. Between the twodollies 506a,b, room is provided for acutting apparatus 500 comprising aknife 200. Thisknife 200 can be fed through ahorizontal channel 510 of theanvil 504 in a cutting direction C through thetube 201 and into agroove 508 provided in theheat sealing unit 502. The cutting direction C is the direction that is transverse to the direction L along which an edge of theknife 200 extends. When theknife 200 has a serrated edge, then the cutting direction C is the direction that is transverse to the direction L along which the serrated edge extends. The cutting direction may then also be the direction along which the cuttingteeth knife 200, when thetube 201 has been sealed together in atransversal sealing area 207, thetransversal sealing area 207 can be cut into two parts, thereby forming thetop fin 102 of one package and the bottom fin of another package. - Even though exemplified herein as the transversal sealing unit, other types of cutting and sealing
units 809 may also be used. In addition, even though explained above with respect to induction heat sealing, other types of sealing technology may also be used, e.g. ultrasonic sealing. - It is also possible to have separate devices for providing transversal sealings and for cutting. In case such approach is chosen, the
cutting apparatus 500 comprising theknife 200 and a motor for moving this back and forth can be provided as a separate device downstream a transversal sealing device comprising theheat sealing unit 502, theanvil 504 and a motor for moving the two between a closed and an open state. -
Fig. 3 illustrates a perspective view of theknife 200 and thetube 201 in isolation before cutting, that is, before theknife 200 divides thetube 201 in thetransversal sealing area 207. Theknife 200 may be seen as a cutting blade provided with aspine 203, facing away from thetube 201 during cutting, and aserrated edge 210 facing thetube 201 during cutting and extending in a longitudinal extension L perpendicular to the cutting direction C. During operation, i.e. when installed in the transversal sealing unit orother cutting apparatus 500, afirst blade surface 204 may be facing upwards and asecond blade surface 206 may be facing downwards. To assure that theknife 200 is securely fastened,attachment portions 208a,b, herein exemplified as holes, may be provided. - The
serrated edge 210 has cuttingteeth 211 and to provide for that thenotch 108 can formed during the cutting, a notch-cuttingtooth 212 is provided. As illustrated inFig. 3 and more in detail inFig. 8 , the notch-cuttingtooth 212 may be longer, as seen in the cutting direction C, than the cuttingteeth 211. -
Fig. 4 illustrates another perspective view of theknife 200 and thetube 201 in isolation, but after the cutting has been made. As illustrated, due to the notch-cuttingtooth 212, thenotch 108 can be formed in thepackage 100. In addition, asecond cut surface 218, i.e. a bottom edge, is also formed. Even though thepackages 100 are formed upside down in the example illustrated, it is also possible to form the packages upright. - By having the
attachment portions 208a,b arranged to interact with thecutting apparatus 500, theknife 200 can be mounted securely such that a placement of thenotch 108 in thefirst cut surface 112 can be controlled in detail. Theattachment portions 208a,b, possibly in combination with a contour of the knife, may be arranged such that theknife 200 can only be mounted with thefirst blade surface 204 facing upwards, thereby reducing the risk that thenotch 108 is incorrectly provided in thesecond cut surface 218, i.e. in the bottom fin of thepackage 100. -
Fig. 5 illustrates theknife 200 in further detail. As illustrated, the notch-cuttingtooth 212 can be longer than the cuttingteeth serrated edge 210. The notch-cuttingtooth 212 may be at least 25% longer that the cuttingteeth tooth 212 and the cuttingteeth - As illustrated, the
knife 200 may be single-beveled. Put differently, the cuttingteeth first blade surface 204. - The cutting
teeth tooth 212 of theserrated edge 210 may be of equal length. In case the cuttingteeth 211 are not of equal length, they may all differ less than ±5% in length from a mean length of the cuttingteeth -
Fig. 6 illustrates theknife 200 seen from above with thefirst blade surface 204 facing upwards, that is, in accordance with how the knife is arranged in thetransversal sealing unit 500 illustrated inFig. 2 .Fig. 7 on the other hand illustrates theknife 200 seen from below, showing thesecond blade surface 206. -
Fig. 8 illustrates the notch-cuttingtooth 212 and adjacent cuttingteeth tooth 212 can comprise asfirst tooth surface 2121, which forms part of thefirst blade surface 204, or put differently is flush with thefirst blade surface 204. Further, thefirst tooth surface 2121 can be arranged to extend, in the cutting direction C, beyond atip 2111 of anadjacent cutting tooth 211. Thefirst tooth surface 2121 may extend at least 1 mm beyond thetip 2111 of theadjacent cutting tooth 211. - The notch-cutting
tooth 212 can further comprise a second tooth surface 2122 (seeFig. 7 andFig. 9 ) that forms part of thesecond blade surface 206, or put differently is flush thesecond blade surface 206. As illustrated, the cuttingtooth 212 may have a length D1, measured from base line BL of theserrated edge 210 to a notch-cutting tooth tip line NL, and the adjacent cuttingteeth tooth 212 may, as illustrated, be greater than the length D2 of the cuttingteeth teeth - Further, the
first tooth surface 2121 may have a width D3, in a direction L that is transverse to the cutting direction C, that is at least 0,4 mm. -
Fig. 9 illustrates a cross-sectional view along the line A-A illustrated inFig. 6 . As illustrated, afront edge 2123 of the notch-cuttingtooth 212 may be without bevel. Thefront edge 2123 may also be provided with a bevel, but less slanted than a bevel of the cuttingteeth second blade surface 206. Thefront edge 2123 may be slanted relative the cutting direction C by an angle α within the range 80° to 100°. -
Fig. 10 illustrates a cross-sectional view of a cutting tooth that is similar to the cuttingteeth Fig. 6 . - As illustrated, the cutting tooth may comprise a respective
front edge 2113 that is slanted relative the cutting direction C by and angle β that is within the range of 25°-65°. The cuttingteeth tooth 212 may be slanted in the same way. - In
Fig. 11 a fillingmachine 800 is illustrated. Aweb 802 ofpackaging material 101 can be provided, e.g. the web can be provided from a reel of packaging material. In alongitudinal sealing unit 804, theweb 802 can be formed into thetube 201 by directing theweb 802 and also continuously provide a longitudinal sealing, i.e. attaching the two longitudinal edges of the web together. By holding thetube 201 vertical it is made possible to fill it withfood product 807 via aproduct filling pipe 806. From thelongitudinal sealing unit 804, thetube 201 can be directed by atube guiding unit 808 into the cutting and sealingapparatus 809, illustrated more in detail inFig. 2 . - In addition to the
cutting apparatus 500, theheat sealing unit 502 and theanvil 504 illustrated inFig. 2 , the cutting and sealingapparatus 809, which also may be referred to as transversal sealing unit, may comprise one orseveral motors 810 arranged for moving theheat sealing unit 502 and theanvil 504 towards each other and away from each other during production of thepackages 100. Before the sealing, theanvil 504 is moved in an anvil direction D-A, and theheat sealing unit 502 is moved in a sealing unit direction D-S, opposite to the anvil direction D-A. In line with the other examples presented herein, thepackages 100 are produced upside down with thefirst cut surface 112, in which thenotch 108 is proved, facing downwards and thesecond cut surface 218 facing upwards. -
Fig. 12 is a flowchart illustrating amethod 900 for filling and sealing thepackage 100. In afirst step 902, thetube 201 can be formed from the web ofpackaging material 101. In asecond step 904, thefood product 807 can be filled into thetube 201. In athird step 906 andfourth step 908, thepackages 100 can be formed by transversally sealing thetube 201 and thereafter cutting thetube 201 into thepackages 100. For cutting, theknife 200 described above can be used. - Optionally, in a
fifth step 910, thetube 201 can be guided with respect to theknife 200 such that the guidingline 110 of thepackaging material 101 is aligned with the notch-cuttingtooth 112 of theknife 200, thereby providing for that thenotch 108 of thefirst cut surface 112 is aligned with the guidingline 110. - From the description above follows that, although various embodiments of the invention have been described and shown, the invention is not restricted thereto, but may also be embodied in other ways within the scope of the subject-matter defined in the following claims.
Claims (15)
- A knife (200) for cutting through a body (201) of packaging material (101) at a transversal sealing area (207) of the body (201), the knife (100) comprisinga serrated edge (210) having a number of cutting teeth (211, 214) for cutting through the packaging material (101) such that a first cut surface (112) and a second cut surface (218) of the packaging material (101) are formed,a first and a second blade surface (204, 206) extending from a respective side of the serrated edge (210), andat least one attachment portion (208a, 208b) for fixing the knife (200) to a cutting apparatus (500), whereinthe serrated cutting edge (210) comprises a notch-cutting tooth (212) arranged to cut out a notch (108) in the first cut surface (112).
- The knife (200) according to claim 1, wherein the notch-cutting tooth (212) is longer than the cutting teeth (211).
- The knife (200) according to any preceding claim, wherein the notch-cutting tooth (212) is at least 25% longer than the than the cutting teeth (211).
- The knife (200) according to any preceding claim, wherein the notch-cutting tooth (212) is at least 1 mm longer than the cutting teeth (211).
- The knife (200) according to any preceding claim, wherein the notch-cutting tooth (212) comprises a first tooth surface (2121) that is flush with the first blade surface (204) and extends, in the cutting direction (C) of the knife (200), beyond the tip (2111) of an adjacent cutting teeth (211)
- The knife (200) according to claim 5, wherein the notch-cutting tooth (212) comprises a second tooth surface (2122) that is flush with the second blade surface (206) and extends, in the cutting direction (C) of the knife (200), beyond the tip (2111) of an adjacent cutting teeth (211).
- The knife (200) according to claim 5 or 6, wherein the first tooth surface (2121) that is flush with the first blade surface (204) extends, in the cutting direction (C) of the knife (200), at least 1 mm beyond the tip (2111) of an adjacent cutting teeth (211).
- The knife (200) according to any of claim 5 - 7, wherein the first tooth surface (2121) that is flush with the first blade surface (204) has a width (D3), in a direction (L) that is transverse to the cutting direction (C) of the knife (200), that is at least 0,4 mm.
- The knife (200) according to any preceding claim, wherein the cutting teeth (211) are single-beveled, with the bevel located on the same side as the first blade surface (204).
- The knife (200) according to any preceding claim, wherein all cutting teeth (211) have the same length (D2), or have a respective length (D2) that deviates at most 10% from a mean value of the lengths of the cutting teeth (211).
- The knife (200) according to any preceding claim, wherein the attachment portion (208a, 208b) is arranged for fixing the knife (200) to a cutting apparatus (500) with the first blade surface (204) upwards, such that it faces the uppermost cut surface (112) of the first cut surface (112) and a second cut surface (218) of the packaging material (101).
- A filling machine (800) for filling and sealing packages (100), the filling machine (800) comprisinga longitudinal sealing unit (804) arranged to form a tube (201) from a web of packaging material (101),a product filling pipe (806) arranged to fill food product (807) into the tube (201), anda cutting and sealing unit (809), comprising a cutting apparatus (500), arranged to transversally seal and cut the tube (201) for forming individual packages (100) filled with the food product (807), wherein the cutting and sealing unit (809) comprisesa knife (200) according to any preceding claim.
- The filling machine according to claim 12, comprising
a tube guiding unit (808) arranged to guide the tube (101) with respect to the knife (200) such that a guiding line (110) of the packaging material (201) is aligned with the notch-cutting tooth (212) of the knife (200). - A method (900) for filling and sealing a package (100), said method comprisingforming (902) a tube (201) from a web of packaging material (101),filling (904) food product (807) into the tube (201), andtransversally sealing (906) and cutting (908) the tube (201) for forming individual packages (100) filled with the food product (807), wherein the cutting (908) comprises cutting the tube (201) witha knife (200) according to any one of claims 1-13.
- The method according to claim 14, comprising
guiding (910) the tube (201) with respect to the knife (200) such that a guiding line (110) of the packaging material (101) is aligned with the notch-cutting tooth (212) of the knife (200).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP21218318 | 2021-12-30 |
Publications (1)
Publication Number | Publication Date |
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EP4205925A1 true EP4205925A1 (en) | 2023-07-05 |
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ID=79185445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP22213363.9A Pending EP4205925A1 (en) | 2021-12-30 | 2022-12-14 | A knife, a filling machine and a method for filling and sealing a package |
Country Status (3)
Country | Link |
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EP (1) | EP4205925A1 (en) |
CN (1) | CN118475444A (en) |
WO (1) | WO2023126175A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5934048A (en) * | 1997-04-29 | 1999-08-10 | Cryovac, Inc. | Seal assembly for easy open pouch |
WO2015028198A1 (en) * | 2013-08-28 | 2015-03-05 | Tetra Laval Holdings & Finance S.A. | Device in a filling machine |
WO2015086209A1 (en) * | 2013-12-09 | 2015-06-18 | Tetra Laval Holdings & Finance S.A. | Knife for a filling machine, cutting device comprising said knife and kit of parts comprising said knife |
-
2022
- 2022-12-14 WO PCT/EP2022/085807 patent/WO2023126175A1/en active Application Filing
- 2022-12-14 EP EP22213363.9A patent/EP4205925A1/en active Pending
- 2022-12-14 CN CN202280086958.XA patent/CN118475444A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5934048A (en) * | 1997-04-29 | 1999-08-10 | Cryovac, Inc. | Seal assembly for easy open pouch |
WO2015028198A1 (en) * | 2013-08-28 | 2015-03-05 | Tetra Laval Holdings & Finance S.A. | Device in a filling machine |
WO2015086209A1 (en) * | 2013-12-09 | 2015-06-18 | Tetra Laval Holdings & Finance S.A. | Knife for a filling machine, cutting device comprising said knife and kit of parts comprising said knife |
Also Published As
Publication number | Publication date |
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WO2023126175A1 (en) | 2023-07-06 |
CN118475444A (en) | 2024-08-09 |
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