GB2059337A - Transverse cutting and sealing tubular films - Google Patents

Transverse cutting and sealing tubular films Download PDF

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Publication number
GB2059337A
GB2059337A GB8029579A GB8029579A GB2059337A GB 2059337 A GB2059337 A GB 2059337A GB 8029579 A GB8029579 A GB 8029579A GB 8029579 A GB8029579 A GB 8029579A GB 2059337 A GB2059337 A GB 2059337A
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GB
United Kingdom
Prior art keywords
film
blade
crimper
anvil
crimpers
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.)
Withdrawn
Application number
GB8029579A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nordson Corp
Original Assignee
Nordson Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US7615779A priority Critical
Application filed by Nordson Corp filed Critical Nordson Corp
Publication of GB2059337A publication Critical patent/GB2059337A/en
Application status is Withdrawn legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30Electrical means
    • B29C65/305Electrical means involving the use of cartridge heaters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/01General aspects dealing with the joint area or with the area to be joined
    • B29C66/05Particular design of joint configurations
    • B29C66/10Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112Single lapped joints
    • B29C66/1122Single lap to lap joints, i.e. overlap joints
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/40General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43Joining a relatively small portion of the surface of said articles
    • B29C66/431Joining the articles to themselves
    • B29C66/4312Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167Quick change joining tools or surfaces
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/83General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • B29C66/83513Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums cooperating jaws mounted on rollers, cylinders or drums and moving in a closed path
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/84Specific machine types or machines suitable for specific applications
    • B29C66/849Packaging machines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10Applying or generating heat or pressure or combinations thereof
    • B65B51/26Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/306Counter-rotating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81417General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled being V-shaped
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/81General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81419General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled and flat
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00General aspects of processes or apparatus for joining preformed parts
    • B29C66/80General aspects of machine operations or constructions and parts thereof
    • B29C66/82Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822Transmission mechanisms
    • B29C66/8223Worm or spindle mechanisms

Abstract

A cut off and sealing mechanism for a tubular film wrapper F containing spaced articles including rotary shaft- mounted crimpers 19, 20 with confronting film-engaging faces producing closing and sealing or crimping of the film in the seal area, the crimper 20 being spring-mounted relative to the frame of the machine; one crimper 20 containing a stationary cutting blade 25 at the film-engaging face of the crimper; and the other crimper 19 having a yieldable anvil blade 27 to bear against the edge of the blade 25 and yield under the influence thereof to maintain a predetermined pressure relationship between the blades 25, 27 for cutting of the film. Coil springs 30 urge the blade 27 outwardly of the crimper 19 but roll pins 29 retain the blade 27 in the crimper 19. The pressure exerted by the springs 30 is adjustable by movement of a plug 32. The crimpers 19, 20 are heated electrically by elements 23 and have serrated film-engaging surfaces. Preferably, the sharpened edge of the blade 25 extends slightly spirally of the rotation axis of the shaft 15 of the crimper 20. In a modification, the knife blade is yieldably mounted. <IMAGE>

Description

SPECIFICATION Package forming apparatus This invention relates to packaging apparatus and more particularly to the cut off mechanism of a wrapper by which a film in substantially tubular form embraces spaced articles or containers moving along a conveyor line wherein the tubular wrapper is severed and closed as by sealing between the spaced articles Background of the invention Tubular film wrappers are most often made of heat-sealable material such as polyethylene film, or a wide variety of other heat-sealable plastics; however,in certain situations, the material of the film may be sealable to itself without application of heat, and sealable merely by application of pressure. The film materials will vary over a wide range in thickness, depending upon the necessary strength of the material in the wrapper and the nature of the article or goods being packaged.The sizes and nature of the articles being packaged also vary over an extremely wide range, and may in some instances be hard goods such as tools and machine parts, and in other instances may be boxes which contain one or more individual articles; or in other instances the goods being wrapped may be fragile articles such as cookies or crackers which produce crumbs during handling.

Modern wrappers move the film and articles being wrapped along through the machine at speeds which are typically in the range of 50 to 300 inches per minute, and 500 inches per minute is not particularly excessive speed. Depending upon the size of the packages being formed, the wrapper will make up to 250 packages per minute, each of which must be cleanly cut from the tube film between the spaced articles being wrapped. Of course, the ends of the packages being formed are also sealed closed at the same time the cutting is effected.

In the prior art, the plastic wrapper has been cut in several ways. In one type of cutting arrangement, the tubular film wrapper with the articles enclosed therein passes between revolving shafts which carry crimpers or sealers for sealing the ends of the packages as they are being cut. A knife which is confined in a slot in one of the crimpers is momentarily projected out of the slot to slice through the film as the crimpers engage the seal the film closed.

The knife which moves radially with respect to the shaft moves into a slot in the other crimper as it completes the cutting operation, and then the knife is quickly withdrawn to be ready for the next cutting operation. Although this type of reciprocating knife arrangement is widely used, it is complicated and expensive to build and maintain.

Another type of cutting arrangement in the prior art uses the similar revolving crimpers as described above. One of the crimpers carries a substantially flat and stationary anvil; and the other of the crimpers carries a knife with a cutting edge to cooperate with the anvil face for cutting the film moving between the revolving shafts and crimpers.

In this construction, the proper setting of the location of the knives with respect to the anvil faces and the proper location of the crimpers with respect to each other is extremely critical. The knife must be adjusted with respect to the anvil so that the edge of the knife barely kisses the surface of the anvil without applying any excessive pressure. This setting causes the knife to cleanly sever the thicknesses of the film wrapper. However, the knife adjustment is very critical; and if the knife is backed away from the anvil as little as 0.001 inch, the cut off of the film wrapper will not be reliably complete. A mere change in the heat conditions in the crimper which mounts the knife and anvil may change the optimum setting of the knife.Decreasing the heat in the crimper will cause the knife to back away from the anvil due to metal contraction, thereby preventing good and clean cut off. An increase in the heat will cause interference between the knife and anvil, resulting in abnormally high wear on the sharp knife edge.

In this prior art cut off arrangement wherein the knife is stationary with respect to the revolving shaft, and and anvil is also stationary with respect to the adjacent revolving shaft, the wrapping machine may require a new knife or a reground knife approximately every month of operation in order to assuredly cleanly cut each package from the tube of film stock moving through the wrapping machine. Obviously, as the knives must be replaced and readjusted, the machine must be shut down with the associated loss of very valuable production time. In situations where short packages are being wrapped, two or four separate crimpers and cut off knives are carried on one of the shafts and corresponding two or four crimpers and anvils are carried on the other shaft.

One other problem is encountered in this type of cut off mechanism is the presence of obstructions in the cut off or seal area. Such obstructions may be cookie crumbs or small particles of material, or may be a wrinkled film, so as to increase the spacing between the crimpers adjacent the knives. If the crumb or particle is in the crimper area, the crimpers will be moved apart slightly during the crimping and cut off operation due to movement of one of the shafts against the springs pressing its bearings toward the optimum position. When the crimper and knife are moved away from the other crimper and anvil, obviously a complete cut off cannot be attained.

Summary of the invention An object of the invention is to provide a cut off and crimping mechanism for a tubular film wrapper which will reliably sever individual packages from the rapidly moving tube of film material which embraces the articles or goods being wrapped.

Another object of the invention is to provide a cut off and crimping mechanism for a tubular film wrapper which will reliably sever the individual packages from the rapidly moving tube of film wrapping material and which will materially extend the life of the cutting blades which are used in severing the film.

A feature of the invention is to yieldably mount the anvil on springs in the revolving crimperwhich cooperates with the opposite revolving crimper which carries a stationary knife cooperating with the anvil in severing the film passing between the crimpers and associated knife and anvil.

Another feature of the invention is the-yieldably mounting of one of the knife and anvil which are respectively disposed in opposite and cooperating revolving crimpers for closing the ends of packages being severed from a high-speed moving tubular film, wherein one of the crimpers is yieldably mounted with respect to the other to accommodate limited variation in the thickness of the film and other obstructions therebetween during the sealing and cut off operation.

The particular advantage of the present invention is to reliably sever the tubular film wrapper at operating speeds necessary for modern commercial production and to avoid the interference of small particles or other obstructions that may exist in the seal area and also extend the life of the cutting blades used to produce the cutting of the film.

Brief description of the drawings Figure 1 is an elevation view of the crimping and cut off mechanism for the packaging machine.

Figure 2 is a side elevation view of the cut off and crimping mechanism.

Figure 3 is an enlarged detail section view taken approximately at 3-3 in Figure 1 and illustrating the crimper and cut off mechanism at the moment of cutting the film passing therethrough.

Figure 4 is a detail section view, similar to Figure 3, and showing the crimper and cut off mechanism at a moment subsequent to complete cut off.

Figure 5 is an enlarged detail view of one of the crimpers with the anvil mounted therein.

Detailed specification One form of the invention is illustrated in the drawings and is described herein.

The wrapper cutting and closing mechanism is indicated in general by numeral 10, and includes upright frame members 11 which mount bearing blocks 12 and 13 respectively mounting rotatable shafts 14 and 15. The lower bearing blocks 12 are affixed to the frame as by cap screws 12.1 to predetermine the location of the shaft 14. The upper bearing blocks 13 are slidable along the inner edges 11.1 of the frame which define a guideway so that the shaft 15 may be moved slightly away from shaft 14 during operation. Each of the movable bearing blocks 13 is urged downwardly by a spring 16, and an adjustable spacer may be provided for maintaining the minimum spacing between the shafts 14 and 15 and to resist the downward urging of the springs 16.A spring anchor mechanism 17 adjusts the downward thrust on the springs 16 so as to establish the resistance necessary to overcome in orderto move the shaft 15 away from shaft 14.

The two shafts 14 and 15 have meshed gears 14.1 and 15.1 which coordinate the' rotation of the two shafts. Input power is supplied to the shafts from a source of rotary power such as gear 18.

Crimpers 19 and 20 extend along and are affixed to the shafts 14 and 15, respectively, by cap screws 22.

The crimpers 19 and 20 are provided with electric resistance heaters 23 to produce sealing heat at the film-engaging surfaces 19.1 and 20.1 thereof. In the form shown, the film-engaging surfaces 19.1 and 20.1 of the crimpers have serrations extending transversely across thesefilm-engaging surfaces for producing similarly shaped crimped surfaces of the -film material Fatthe seal areas F'.

The upper crimper 20 has an elongate slot 24 extending substantially throughout the entire length thereof. An elongate knife blade 25 is confined in the slot 24 and is confined in stationary relation in the slot 24 as by a plurality of set screws 26 located at spaced locations along the length of the blade. It will be recognized that the knife blade 25 has a cutting edge adjacent the adjoining film-engaging surface 20.1 of the crimper 20. The sharpened edge of the knife blade 25 protrudes slightly beyond the surface 20.1 for efficiently severing the film F in the crimp area.It has been found preferable to shape the sharpened edge of blade 25 to extend very slightly spirally or helically of the rotaton axis of shaft 15, so as to effectively cause the cutting edge to engage and cut the plastic film progressively from one end of the blade 25 to the other end thereof as the shaft and blade revolve.

The other crimper 19 also has an elongate slot 26 formed therein and extending along the length thereof. An elongate anvil blade 27 is confined in the slot 26, but is movable therein in a direction toward and away from the rotation axis of the shaft 14 and toward and away from the film-engaging face 19.1 of the crimper. The blade 27 has a plurality of apertures 28 therein to eceive hardened steel roll pins 29 which serve to retain the anvil blade in the slot 26. The roll pins 29 are confined in apertures 19.2 of the crimper.

It will be recognized that the aperture 28 in the anvil blade 27 is slightly larger than the diameter of pin 29 so that the anvil blade 27 may move, to a limited extent, inwardly and outwardly of the slot 26.

The knife edge-engaging anvil surface 27.1 of the anvil blade is located approximately at the film engaging surface 19.1 of the crimper so that the sharpened edge of the knife blade 25 may cooperate with the anvil face 27.1 in severing or cutting the film between the adjacent articles A confined by the tubular film.

A plurality of coil springs 30 bear against the rear edge of the anvil blade 27 and are confined in openings 31 in the crimper 19. Threaded plugs 32 are threaded into the threaded periphery of the open ings 31 and serve as anchors for the springs 30. It will therefore be recognized that the anvil blades 27 may be retracted slightly into the crimper 19 under influence of pressure from the blade 25, as illustrated in Figure 3, and the spring 30 will maintain significant pressure against the anvil blade 27 so that the knife blade 25 and the anvil blade 27 will cooperate in cutting the plastic film.

In operation, the spacing between the shafts 14 and 15 will initially be adjusted by the adjustable spacers 12.2 between the bearing blocks 12 and 13 so that the springs 16 will normally urge the shaft 15 and the crimper 20 into the desired relationship with crimper 19. The two film-engaging faces 19.1 and 20.1 will allow space for the film F therebetween, but will apply sufficient heat and pressure to the film in order to produce a good seal in the seal area F'.

In some instances where a suitable film is utilized, heat may not be necessary in order to produce a seal, but pressure will be applied in order to adhere the film laminae together. The arcuately rounded shapes of the film-engaging surfaces 19.1 and 20.1 effectively causes these surfaces to roll along a short length of the film in the seal area F' during the sealing and cutting process, substantially as illustrated in Figures 3 and 4.

As the film F and articles A are moving in the direction of arrow D, and the shafts 14 and 15 and the crimpers 19 and 20 are revolving in the direction of arrows b and c, respectively, the crimpers 19 and 20 will swing toward each other and squeeze the film into flattened condition in the seal area. The cutting edge of the knife blade 25 will bear against the film with significant pressure and will cut through the film as the edge of the knife blade bears against the anvil face 27.1 of the anvil blade. During the engagement of the sharpened edge of the knife blade 25 with the anvil face 27.1 of the anvil blade, the edge of the knife blade will cause the anvil blade 27 to recede slightly in groove 26, but the springs 30 will maintain the desired amount of pressure against the edge of the knife blade to assure complete cutting of the film.

Subsequently, as the crimpers 19 and 20 roll past the dead center position, into the position illustrated in Figure 4, the film will have been servered as to produce a distinct and separate complete package P sealed entirely shut. The arcuate faces 19.1 and 20.1 of the crimpers will gradually separate as the shafts revolve so as to allow the next article A to pass between the revolving shafts.

Although the specification illustrates only one crimper on each of the shafts 14 and 15, so as to accommodate articles of substantial length, it should be understood that, if it is desired to maintain approximately the same linearfilm speed in the direction of arrow D, and if articles of substantially shorter length are to be packaged, two or more crimpers on each of the shafts and coordinated with each other may be employed. For instance, each of the shafts could have a pair of crimpers, disposed at 180 degrees with respect to each other; or it may be desirable to mount four crimpers on each shaft, each oriented at approximately 90 degrees with respect to each other. Of course, the suitable number of knife blades and anvil blades, spring-mounted, as illustrated herein, would be carried on the several crimpers.

It will be recognized that the permitting of the anvil blade 27 to move slightly in the slot 26 reduces the criticality of the adjustment as to location of blade 25. The amount of pressure that is produced between the cutting edge of the knife blade and the anvil face 27.1 is controlled primarily by the strength of spring 30 and the adjustment thereof produced by the location of plug 32 in the opening 31.

Accordingly, it will be recognized that, simultaneously with the sealing of the film into closed condition at the end of the packages P being formed, the knife blade and anvil cooperate to apply the necessary cutting pressure so as to cleanly cut each package from the tubular film as the film and articles pass by the cutting mechanism 10.

An additional important function oftheyieldably mounted anvil blade 27 becomes apparent when consideration is given to the packaging of articles which may be brittle and produce crumbs or debris inside the package. For instance, if some type of an abnormality were to occur or exist in the seal area F' of the film between the film-engaging faces 19.1 and 20.1 of the crimpers, it may be that the predetermined relation between the two faces 19.1 and 20.1 cannot be maintained. Such an abnormality in the seal area may be a possible wrinkle in the film; or may be a piece of debris fractured from the article being packaged, such as a cookie crumb, if the articles being packaged are cookies. Other types of debris or small particles from the material being packaged could also find its way into the seal area of the film.When such an abnormality occurs, the crimpers 19 and 20 are rolled into confronting relation with each other in the usual way, but due to the presence of the abnormality or obstruction in the seal area, the upper crimper 20 is lifted slightly so as to be spaced somewhat further from the face of the lower crimper 19. This occurs because the bearing block 13 for shaft 15 is permitted to move slightly against the pressure of spring 16. Although the prescribed amount of pressure to be exerted on the film may be reduced momentarily, an adequate seal may very likely occur. Furthermore, because the anvil blade 27 is permitted to move, the spring 30 will cause the blade 27 to move outwardly of crimper 19 from the position illustrated in Figure 3 so as to maintain the predetermined degree of pressure exerted against the cutting edge of the knife blade 25.As a result, even though the obstruction in the seal area caused the crimper 20 to lift slightly off the crimper 19, the efficient cutting action between the blade 25 and the anvil blade 27 will occur and the cut will be cleanly made and without fail. Of course, when the seal area F' containing the obstruction moves away from the cut off mechanism 10, the springs 16 will move the bearing blocks 13 back into predetermined position and the crimper 20 will be returned to its normal relation to the crimper 19 for adequately sealing and severing the next length of film after the shafts and crimpers have made one more revolution.

Whereas the yieldable blade in this disclosure comprises the anvil blade, it may be desirable under certain circumstances that the knife blade should be the yieldable part.

It will be seen that this invention provides a cut off mechanism for a tubular film wrapper wherein both the anvil blade is yieldable as it engages the edge of the knife blade, and acting in conjunction with this yieldability is the yieldability of the bearing blocks 13 to permit the crimper 20 to move slightly away from the crimper 19 in order to accommodate slight abnormalities including obstructions in the seal area.

Claims (7)

1. Apparatus for transversely cutting a rapidly moving tubular film wrapper between the spaced articles confined in the wrapper and closing the cut ends of the wrapper to form individual articleconfining packages, comprising frame means, a pair of revolving parallel shafts of the frame means and spaced from each other to permit travel of the tubular film wrapper and articles therebetween, a pair of elongate crimpers each on a#respective shaft and located to confront and cooperate with each other to engage and press the film wrapper together as the shafts and criapers revolve, the crimpers having arcuatefilm-#,'ngaging surfaces confronting each other in closely spaced relation as the crimpers revolve, each of the crimpers having elongate slots extending longitudinally thereof and opening through the film-engagig surface thereof, an elongate knife blade in the slot of one of the crimpers and having a cutting edge disposed adjacent the film-engaging surface thereof, an elongate anvil blade in the elongate slot of the other of the crimpers and confronting the cutting edge of the knife blade as the crimpers revolve, the anvil having a knife-engaging anvil face disposed adjacent the film-engaging surface of the crimper, one of the elongate blades being movable inwardly and outwardly of the slot in the crimper and toward and away from the adjacent film-engaging surface of the crimper, and spring means bearing against said one movable blade and urging the blade outwardly of the slot and toward the film and permitting yielding of the blade inwardly of the cutting edge of the knife blade and the anvil face of the anvil blade.
2. The invention according to claim 1 wherein one of the shafts has spring-pressed bearing means permitting limited movement of the shaft toward and away from the other of the shafts when an abnormality of increased thickness in the film wrapper occurs between the cooperating crimpers.
3. The invention according to claim 1 wherein the anvil is movable inwardly and outwardlyof the slot of the crimper and toward and away from the adjacent film-engaging surface, and spring means bearing against the anvil and urging the anvil outwardly of the slot and toward the film and permitting yielding of the anvil inwardly against the spring means and in response to pressure on the anvil face by the cutting knife.
4. The invention according to claim 3 and said spring means being confined in cavities adjacent the slot and within the crimper.
5. The invention according to claim 3 and pin means engaging and confining the anvil in the slot of the crimper.
6. The invention according to claim 4 wherein one of the shafts has spring-pressed bearing means permitting limited movement of the shaft toward and away from the other of the shafts when an abnormality of increased thickness in the film wrapper occurs between the cooperating crimpers.
7. Apparatus as claimed in claim 1 and substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
GB8029579A 1979-09-17 1980-09-12 Transverse cutting and sealing tubular films Withdrawn GB2059337A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128928A (en) * 1982-10-27 1984-05-10 Auto Wrappers Improvements in heated jaws for packaging machinery
FR2586230A1 (en) * 1985-08-15 1987-02-20 Orihiro Co Ltd transverse sealing mechanism for product packaging devices in plastic material bags
GB2194754A (en) * 1986-09-11 1988-03-16 Tetra Pak Ab Method of sealing the top portion of a gable-top type container
GB2221868A (en) * 1988-07-22 1990-02-21 Fmc Corp Thermoplastics sealing and severing head
US5067302A (en) * 1990-01-26 1991-11-26 Zip-Pak Incorporated Sealing jaws for zippered foil or film in form, fill and seal machines
FR2754516A1 (en) * 1996-10-11 1998-04-17 Joseph Cruanas Ets Machine for the continuous packaging of tablets in individual cases
NL1008645C2 (en) * 1998-03-19 1999-09-21 Dameta V O F Smeltlaswang for fusion welding of a number of layers of film material, heat seal apparatus is provided with a smeltlasbek of two such smeltlaswangen and packaging closed by the intermediary of such a heat sealing apparatus.
WO2008119633A1 (en) * 2007-03-29 2008-10-09 Hochland Natec Gmbh Cross-cutting device
US7941991B2 (en) * 2004-12-16 2011-05-17 Lako Tool & Manufacturing, Inc. Split crimper for heat sealing packaging material
WO2011148348A1 (en) * 2010-05-28 2011-12-01 En4En - Engineering For Environment S.R.L. Bag sealer and sealing unit
WO2012020118A1 (en) * 2010-08-12 2012-02-16 Frito-Lay Trading Company Gmbh Packaging apparatus including rotary jaw device and method of making packages

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128928A (en) * 1982-10-27 1984-05-10 Auto Wrappers Improvements in heated jaws for packaging machinery
FR2586230A1 (en) * 1985-08-15 1987-02-20 Orihiro Co Ltd transverse sealing mechanism for product packaging devices in plastic material bags
GB2194754B (en) * 1986-09-11 1991-03-06 Tetra Pak Ab Method of sealing the top portion of a gable-top type container
GB2194754A (en) * 1986-09-11 1988-03-16 Tetra Pak Ab Method of sealing the top portion of a gable-top type container
GB2221868A (en) * 1988-07-22 1990-02-21 Fmc Corp Thermoplastics sealing and severing head
US5067302A (en) * 1990-01-26 1991-11-26 Zip-Pak Incorporated Sealing jaws for zippered foil or film in form, fill and seal machines
FR2754516A1 (en) * 1996-10-11 1998-04-17 Joseph Cruanas Ets Machine for the continuous packaging of tablets in individual cases
NL1008645C2 (en) * 1998-03-19 1999-09-21 Dameta V O F Smeltlaswang for fusion welding of a number of layers of film material, heat seal apparatus is provided with a smeltlasbek of two such smeltlaswangen and packaging closed by the intermediary of such a heat sealing apparatus.
US8146327B2 (en) * 2004-12-16 2012-04-03 Testing Machines, Inc. Split crimper for heat sealing packaging material
US7941991B2 (en) * 2004-12-16 2011-05-17 Lako Tool & Manufacturing, Inc. Split crimper for heat sealing packaging material
US8387344B2 (en) 2004-12-16 2013-03-05 Testing Machines, Inc. Split crimper for heat sealing packaging material
WO2008119633A1 (en) * 2007-03-29 2008-10-09 Hochland Natec Gmbh Cross-cutting device
WO2011148348A1 (en) * 2010-05-28 2011-12-01 En4En - Engineering For Environment S.R.L. Bag sealer and sealing unit
WO2012020118A1 (en) * 2010-08-12 2012-02-16 Frito-Lay Trading Company Gmbh Packaging apparatus including rotary jaw device and method of making packages
US8640433B2 (en) * 2010-08-12 2014-02-04 Frito-Lay Trading Company Gmbh Packaging apparatus including rotary jaw device and method of making packages
RU2545864C2 (en) * 2010-08-12 2015-04-10 Фрито-Лэй Трейдинг Компани ГмбХ Packaging machine with rotary clamping device and method of manufacturing packages

Also Published As

Publication number Publication date
CA1138767A (en) 1983-01-04
CA1138767A1 (en)

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