GB2290498A - Device for bonding together two strips of wrapping material - Google Patents

Device for bonding together two strips of wrapping material Download PDF

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Publication number
GB2290498A
GB2290498A GB9510915A GB9510915A GB2290498A GB 2290498 A GB2290498 A GB 2290498A GB 9510915 A GB9510915 A GB 9510915A GB 9510915 A GB9510915 A GB 9510915A GB 2290498 A GB2290498 A GB 2290498A
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GB
United Kingdom
Prior art keywords
strips
conveyor
bonding
chamber
ribbon
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.)
Granted
Application number
GB9510915A
Other versions
GB2290498B (en
GB9510915D0 (en
Inventor
Silvano Boriani
Antonio Gamberini
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.)
GD SpA
Original Assignee
GD SpA
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Filing date
Publication date
Application filed by GD SpA filed Critical GD SpA
Publication of GB9510915D0 publication Critical patent/GB9510915D0/en
Publication of GB2290498A publication Critical patent/GB2290498A/en
Application granted granted Critical
Publication of GB2290498B publication Critical patent/GB2290498B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • B29C65/7847—Holding or clamping means for handling purposes using vacuum to hold at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint 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
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General 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
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General 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
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • B29C66/4722—Fixing strips to surfaces other than edge faces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General 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
    • B29C66/818—General 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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General 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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General 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 cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General 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
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General 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
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General 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
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83417—Roller, cylinder or drum types said rollers, cylinders or drums being hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B29C66/91423—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools using joining tools having different temperature zones or using several joining tools with different temperatures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/932—Measuring or controlling the joining process by measuring or controlling the speed by measuring the speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0046—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by constructional aspects of the apparatus
    • B32B37/0053—Constructional details of laminating machines comprising rollers; Constructional features of the rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93441—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed being non-constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)

Description

2290498 A device for bonding together two strips of wrapping material The
present invention relates to a device for bonding together two strips of wrapping material.
More particularly, the present invention relates to a device for securing a tear ribbon to a strip of wrapping material, and is applicable advantageously to machines for overwrapping packets of cigarettes in respective sheets of a transparent material.
In machines of this type, packets of cigarettes are enveloped in corresponding wrappers furnished with a tear ribbon, generally of plastic material, which is applied to the sheet of overwrapping material in such a manner as to allow of lacerating the wrapper neatly along a predetermined line of separation and thus facilitate the operation of breaking open the packet of cigarettes.
The tear ribbon is normally applied to a continuous strip of the selected overwrapping material, from which single sheets will be divided ultimately, utilizing a bonding process performed by relative bonding means that operate in conjunction with an 2 aspirating transmission roller. The ribbon and the strip are held against the revolving surface of the roller by suction and advanced beneath the bonding means, which proceed to compress the ribbon and the wrapping material against the roller until the two are securely joined.
The temperature of the bonding means is determined by the characteristics of the elements to be joined together, whilst the angular velocity of the roller is dependent on the operating speed of the wrapping machine.
A bond between the ribbon and the strip of wrapping material can be obtained by melting a layer either of wax material or of hot melt plastic material, is which will be applied previously to the ribbon as a coating, or alternatively by heat-sealing the two elements together directly, both being fashioned in a heat-sealable material.
Where a wax type of material is used, the operating temperature of the bonding means will be relatively low, and unlikely to cause any damage in the event that the ribbon and the strip should be exposed to the resulting heat for a period of time longer than that envisaged, due to a reduction in the operating speed of the machine.
3 By contrast, problems tend to arise when hot melt plastics are utilized, and when the ribbon and the strip are heat-sealed together directly: in either instance the temperatures involved are much higher, and only by allowing the ribbon and the strip to remain exposed to such temperatures for a precisely determined duration can a bond be obtained without damage occurring.
Nonetheless, it can happen for a variety of reasons that the operating speed of such wrapping machines will drop temporarily, and since a reduction in the operating speed of the machine causes the roller to turn more slowly, the effect is to prolong the time that the ribbon and the strip are retained between is the roller and the bonding means, with consequent damage to the ribbon and the strip.
The object of the present invention is to provide a bonding device capable of ensuring that the ribbon and the strip of wrapping material will not remain exposed to a hot melt or heat-seal temperature for any period of time longer than that prescribed.
The stated object is realized according to the present invention in a device for bonding together two strips of wrapping material, comprising a conveyor by which the strips are restrained from 4 one side and advanced in mutual contact, and on the side opposite, bonding means occupying a position of close proximity to the conveyor and operating in conjunction with at least one portion thereof, characterized in that the conveyor is equipped with cooling means, afforded at least by the endmost part of the portion operating in conjunction with the bonding means, and in that the function of the cooling means is to regulate the temperature of the strips while still subject to the action of the bonding means, maintaining the value within safe limits even in the event that the velocity of the conveyor should be reduced, and thus to shorten the duration of the period for which the strips remain is exposed to the heat generated by the bonding means.
The invention will now be described in detail, by way of example, with the aid of the accompanying drawing, which illustrates the device schematically in a side elevation with certain parts cut away and shown in section better to reveal others.
With reference to the drawing, the device according to the invention, denoted 1 in its entirety, can be incorporated into an automatic wrapping machine, in particular an overwrapping machine (not indicated), with which it will be synchronized in operation.
Utilized for the purpose of bonding together two strips 2 and 3 of wrapping material, the device 1 in question is composed of an aspirating conveyor 4 and bonding means 5 disposed on opposite sides of the strips 2 and 3, the strips themselves disposed in mutual contact.
The bonding means 5 occupy a position close to one portion or sector 6 of the conveyor 4, and operate in conjunction with this same portion in uniting the strips 2 and 3.
In referring to the accompanying drawing, mention is made specifically, albeit without limiting the scope of the present invention in any way, to the application of a slender tear ribbon 2 to a strip is of wrapping material 3.
The conveyor 4 consists in a transmission roller serving both the tear ribbon 2, which is referred to hereinafter simply as a ribbon, and the strip 3 to which the ribbon 2 must be secured. The drawing does not show the components, all conventional, by which the ribbon 2 and the strip 3 are fed onto the roller 4, but simply indicates a pressure roller 13 located immediately preceding the bonding means 5, relative to the feed direction denoted F, in such a way as to maintain the strip 3 in contact with the 6 ribbon 2 and against the peripheral surface of the roller 4.
The bonding means 5 are illustrated as a heater plate 16 exhibiting the shape of-an annular sector and operating in conjunction with the sector 6 of the roller 4. The heater plate 16 is maintained at an operating temperature calculated on the basis of the time the ribbon 2 and the strip 3 are to remain between the roller 4 and the heater plate 16, or in practice, the time needed for the ribbon 2 and the strip 3 to advance through the full circumferential distance compassed by the sector 6 and the heater plate 16 with the wrapping machine operating at its normal speed.
is The roller 4 comprises a fixed cylindrical core 9, and a similarly cylindrical mantle 10 coupled with and rotatable about the core 9. The periphery of the core 9 affords a recess that combines with the mantle 10 to create a chamber 11 connecting with a source of negative pressure (not illustrated). The chamber 11 occupies at least a part of the sector 6 plus a portion of the core 9 located preceding the sector 6, considered in the direction of rotation V of the mantle 10. The mantle 10 is embodied with a plurality of holes 12 distributed around the entire 7 periphery and allowing communication between the chamber 11 and the surrounding environment, so that a degree of suction can be generated through the part of the peripheral surface of the mantle 10 coinciding with the holes 12 positioned over the chamber 11, sufficient to retain the ribbon 2 and the strip 3 in contact with this same surface.
The roller 4 further comprises cooling means 7, positioned at least within the endmost portion of the sector 6, of which the function is to lower the temperature of the ribbon 2 and the strip 3 while still exposed to the action of the heater plate 16, and to maintain the temperature value within given safe limits even when the angular velocity of the is roller 4 may be reduced for any reason. In other words, the cooling means 7 are effectively able to control the length of time the ribbon 2 and the strip 3 are exposed to the heat generated by the plate 16.
Naturally, the control will operate in response to a reduction in angular velocity of the roller 4 as detected in relation to the normal running speed.
The cooling means 7 appear in the accompanying drawing as two successive but distinct chambers 8 positioned within the sector 6 and connected to a 8 supply 14 of suitable cooling fluid interlocked to respective monitoring and control means 15. In a preferred solution, the cooling fluid in question will be compressed air.
observing the embodiment of the device illustrated by way of example, in particular, the chambers 8 occupy a position within the sector 6 of the core 9 and immediately beyond the suction chamber 11, in the direction of rotation of the mantle 10.
The function of the monitoring and control means 15 is to sense the angular velocity of the rotating mantle 10 and pilot the operation of the compressed air supply 14, as indicated diagrammatically by the arrows and blocks.
is At all events, the activation of the compressed air supply 14 and/or the connection between the supply and the chambers 8 will occur in the manner now to be described.
In normal operating conditions, the ribbon 2 and the strip 3 are retained on the peripheral surface of the mantle 10 by the suction generated through the aspirating chamber 11 and the holes 12; suction ceases as each successive hole 12 passes beyond and out of communication with the chamber 11. In this situation, the compressed air supply 14 will not be 9 activated by the monitoring and control means 14, so that the ribbon 2 and the strip 3 remain at the regulated temperature of the heater plate 16 during their advance along the entire distance compassed by the sector 6 and the plate 16.
In the event of the mantle 10 rotating more slowly for whatever reason, the monitoring and control means 15 will sense the change and activate the cooling system by connecting the compressed air supply 14 to either one or both of the chambers 8, according to the extent of the reduction in angular velocity. Thereafter, on drawing level with the first chamber 8 connected to the compressed air supply 14, the ribbon 2 and the strip 3 will be is cooled to a temperature below the hot melt or heat seal temperature.
Clearly, whether the compressed air supply 14 is activated to flood both the chambers or only the second chamber 8 in sequence, the ultimate effect is still one of reducing the distance through which the ribbon 2 and strip 3 advance at the operating temperature of the heater plate 16, and therefore of shortening the time the ribbon 2 and the strip 3 remain exposed to this same temperature. Since the device allows of connecting both chambers 8 or one chamber only to the compressed air supply 14, the selection is determined by the reduction in angular velocity of the mantle 10: where the reduction is slight, it will be sufficient to connect only the final chamber 8 to the compressed air supply 14, whereas if the reduction is more significant, both the chambers 8 can be connected to the supply 14 to obtain a further shortening of the distance through which the ribbon 2 and the strip 3 advance while exposed to the operating temperature of the heater plate 16.
Whilst the accompanying drawing indicates only two cooling chambers 8, the number might be increased in order to obtain a more linear variation of the is distance advanced by the ribbon 2 and the strip 3 while exposed to the normal operating temperature of the heater plate 16.
1 11

Claims (8)

  1. Claims
    A device for bonding together two strips of wrapping material, comprising a conveyor by which the strips are restrained from one side and advanced in mutual contact, and on the side opposite, bonding means occupying a position of close proximity to the conveyor and operating in conjunction with at least one portion thereof, characterized in that the conveyor is equipped with cooling means, afforded at least by the endmost part of the portion operating in conjunction with the bonding means, and in that the function of the cooling means is to regulate the temperature of the strips while still subject to the action of the bonding means, maintaining the value within safe limits even in the event that the velocity of the conveyor should be reduced, and thus to shorten the duration of the period for which the strips remain exposed to the heat generated by the bonding means.
  2. 2) A device as in claim 1, wherein the function of the 12 2) A device as in claim 1, wherein the function of the cooling means is to shorten the duration of the period for which the strips remain at the operating temperature of the bonding means, in response to a reduction in angular velocity of the conveyor as measured against a predetermined normal angular velocity.
  3. 3) A device as in claim 1 or 2, wherein cooling means comprise at least one chamber located within the portion of the conveyor operating in conjunction with the bonding means, and a supply of cooling fluid to which the chamber is connected.
  4. 4) A device as in claims 1 to 3, wherein cooling means comprise one or more chambers located in sequence within the portion of the conveyor operating in conjunction with the bonding means, a supply of cooling fluid to which the chambers are connected, and respective monitoring and control means to which the supply of fluid is interlocked.
  5. 5) A device as in claim 3 or 4, wherein the chamber is connected to a supply of compressed air interlocked to respective monitoring and control means.
  6. 13 6) A device as in preceding claims, wherein the strips of material consist in a tear ribbon, and a strip of wrapping material to which the ribbon must be applied, the conveyor is embodied as an aspirating transmission roller of which one portion or sector is disposed facing and operates in conjunction with the bonding means, and the roller is equipped with cooling means afforded at least by the endmost part of the sector operating in conjunction with the bonding means and comprising at least one chamber such as can be connected with a supply of cooling fluid through the agency of monitoring and control means designed to sense the angular velocity of the roller and to pilot the operation of the cooling means.
  7. 7) A device as in claim 6, wherein the transmission roller is composed of a fixed cylindrical core and a cylindrical mantle rotatable around the core, the periphery of the cylindrical core affords at least one recess combining with the mantle to create a chamber communicating with a source of negative pressure and directed at least in part toward the bonding means, the mantle affords a plurality of radially disposed through holes distributed around 14 the entire peripheral surface in such a manner as to rotate cyclically into communication with the negatively pressurized chamber of the core and thus allow of generating suction by which the ribbon and the strip are held in contact with the peripheral surface, and the core affords at least one chamber positioned following the negatively pressurized chamber in the conveying direction, communicating with a supply of cooling fluid and constituting the cooling means, of which the function is to shorten the duration of the period for which the ribbon and the strip remain at the temperature of the bonding means.
  8. 8) A device for bonding together two strips of wrapping material, substantially as described with reference to the accompanying drawing.
GB9510915A 1994-06-23 1995-05-30 A device for bonding together two strips of wrapping material Expired - Fee Related GB2290498B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT94BO000290A ITBO940290A1 (en) 1994-06-23 1994-06-23 DEVICE FOR WELDING BETWEEN TWO TAPES OF MATERIAL FOR WRAPPING.

Publications (3)

Publication Number Publication Date
GB9510915D0 GB9510915D0 (en) 1995-07-26
GB2290498A true GB2290498A (en) 1996-01-03
GB2290498B GB2290498B (en) 1997-12-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9510915A Expired - Fee Related GB2290498B (en) 1994-06-23 1995-05-30 A device for bonding together two strips of wrapping material

Country Status (3)

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DE (1) DE19519844A1 (en)
GB (1) GB2290498B (en)
IT (1) ITBO940290A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5843253A (en) * 1995-12-14 1998-12-01 G.D.S.P.A. Method and device for sealing a narrow tape to a heatsealable strip

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10157366A1 (en) * 2001-11-24 2003-05-28 Kiener Maschinenbau Gmbh Device for laminating or coating a substrate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079760A2 (en) * 1981-11-18 1983-05-25 The Mead Corporation Heat control system for packaging machine
WO1992010362A1 (en) * 1990-12-04 1992-06-25 Hexcel Corporation Process for the preparation of thermoplastic honeycomb sandwich structures

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079760A2 (en) * 1981-11-18 1983-05-25 The Mead Corporation Heat control system for packaging machine
WO1992010362A1 (en) * 1990-12-04 1992-06-25 Hexcel Corporation Process for the preparation of thermoplastic honeycomb sandwich structures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5843253A (en) * 1995-12-14 1998-12-01 G.D.S.P.A. Method and device for sealing a narrow tape to a heatsealable strip
EP0779219B1 (en) * 1995-12-14 2002-04-03 G.D. S.p.A. Method and device for sealing a narrow tape to a heatsealable strip

Also Published As

Publication number Publication date
DE19519844A1 (en) 1996-01-04
GB2290498B (en) 1997-12-10
ITBO940290A0 (en) 1994-06-23
GB9510915D0 (en) 1995-07-26
ITBO940290A1 (en) 1995-12-23

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