GB2128928A - Improvements in heated jaws for packaging machinery - Google Patents

Improvements in heated jaws for packaging machinery Download PDF

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Publication number
GB2128928A
GB2128928A GB08230713A GB8230713A GB2128928A GB 2128928 A GB2128928 A GB 2128928A GB 08230713 A GB08230713 A GB 08230713A GB 8230713 A GB8230713 A GB 8230713A GB 2128928 A GB2128928 A GB 2128928A
Authority
GB
United Kingdom
Prior art keywords
jaw
pack
heatable
channel
sheet
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Withdrawn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
GB08230713A
Inventor
Michael Edward Knights
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.)
AUTO WRAPPERS
Original Assignee
AUTO WRAPPERS
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
Application filed by AUTO WRAPPERS filed Critical AUTO WRAPPERS
Priority to GB08230713A priority Critical patent/GB2128928A/en
Publication of GB2128928A publication Critical patent/GB2128928A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B29C65/02—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
    • B29C65/24—Joining 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
    • B29C65/30—Electrical means
    • B29C65/305—Electrical means involving the use of cartridge heaters
    • 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
    • B29C65/74—Joining 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
    • B29C65/743—Joining 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
    • 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
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • 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
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • 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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81264—Mechanical properties, e.g. hardness
    • 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
    • B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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
    • B29C66/816—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 mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B29C66/83511—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws jaws mounted on rollers, cylinders or drums
    • 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
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/007—Hardness

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A heated jaw (11) for pack- sealing and/or pack-cutting has an elongate channel (16) in its pack- contacting surface (15). A sheet or sheets (22) of silicone rubber or other heat-resistant resiliently deformable material extends across the surface (15) between clamps (19 and 21) and an anvil or knife strip (23) which fits in the channel (16). The sheet (22) may either be clamped by the strip (23) or may run loosely between it and the walls of the channel. In the embodiment of Fig. (3) there is a single sheet (22) held at both clamps (19 and 21) and beneath the anvil or knife strip (23). The jaw described has good heat transfer properties since the sheet (22) deforms to accommodate the web of the pack. It is also easier to change sheets when they wear out and thereby softer material may be used to give even better properties. <IMAGE>

Description

SPECIFICATION Improvements in heated jaws for packaging machinery The invention relates to heated jaws for packaging machinery.
Form-fill-seal packaging machines conventionally incorporate heated contra-rotating jaws which seal across the folded productcarrying longitudinally-sealed web of packaging material, to define individual packs, and which then sever those individual packs from the web. The anvil or knife carried by such a jaw takes the form of an elongate strip held firmly but replaceably in the jaw. The heating means are well known and need not be detailed here.
Where several thicknesses of material have to be heat-sealed, the quality of seal can vary.
As flow speeds increase, it becomes progressively more difficult to achieve a consistently good, almost hermetic, seal which some applications may require. The pack-contacting surfaces of the jaws are usually serrated in an attempt to maximise the heat transfer and hence the seal quality, but problems remain.
It has been proposed to face the packcontacting surface of one or both jaws with resiliently deformable high-temperature-resistant material such as silicon rubber. As the jaws close around the web, the rubber deforms to accommodate the several thicknesses of web material, and heat transfer is maximised. The rubber facing material has previously been bonded to the pack-contacting jaw surface. However, because the jaw surface is curved, the opposite edge regions of the rubber facing sheet tend to curl up from the jaw surface. Also, the problem of how to face the jaw with such material across an anvil or knife strip had not been tackled. The prior rubberfaced jaws did not incorporate knives.
According to the invention, a heated packsealing and/or pack-cutting jaw has an elongate pack-contacting anvil or knife strip held removably in a channel running along the jaw (ie. parallel with the axis about which the jaw, in use, rotates); the anvil or knife strip holds a replaceable sheet of resiliently deformable high-temperature-resistant material, for example silicon rubber, in that channel so that the material extends across the jaw from one or from each side of the anvil or knife; and the material extends around the edge of the jaw and is then clamped to a non-pack-contacting surface of the jaw.
A single sheet of the material may have each of its opposite edge regions clamped to a respective non-pack-contacting surface of the jaw, for example to a side of the jaw, with the anvil or knife strip locating a central region of the material in the channel. This has advantages in ease of securing the material to the jaw.
The anvil or knife strip may "hold" the material in the sense of locating it in the channel without positively clamping it there when a single sheet of material, clamped at each of its opposite edges, is used as just outlined. If no adhesive bonds the material to the pack-contacting jaw surface, the material is then theoretically free to roll across the jaw surface under pack-gripping pressure. This could improve the life of the material and/or the heat transfer action.
In practical embodiments of the invention, the jaw edges round which the material extends will preferably be radiused to minimise any tendency for the material to split along those edges.
Previous proposals to face the jaw with material of the kind in question have concentrated on using relatively hard rubbers, on the ground that these will best resist wear. However, a relatively soft material might be more advantageous, giving better heat transfer at the possible expense of durability. Because the material can so easily be unclamped and replaced in an arrangement according to the present invention, a softer material which needs replacing more often can feasibly be used. The shore hardness of such a material may not exceed 80, or perhaps 60, and could advantageously lie within a range of from 40 to 50.
The skilled reader will be able to select suitable jaw-facing materials, but way of example, one currently available product is the silicon rubber sold under the trade mark COHRlastic which is manufactured by the Connecticut Hard Rubber Company of Connecticut, USA and distributed in the United Kingdom by Polypenco Limited.
One packaging machine jaw embodying the invention is shown in the accompanying drawings. It will now be described with reference to those drawings. It is only one example of forms which the invention might take within its broadest aspect, but it is currently the best way known to the applicants of putting the invention into practice.
In the drawings: Figures 1, 2 and 3 show the jaw mounted on its shaft, sectioned across its axis of rotation, and viewed end-on, and illustrate successive stages in the build-up of the faced jaw; and Figure 2 shows the faced jaw sectioned and viewed along its axis of rotation.
In the drawings, the jaw 11 is fixed to a circular-section shaft 12 by countersunk clamping screws 13 in known manner. Bores 14 run through the jaw to take heating rods, again in known manner. The pack-contacting surface 15 of the jaw is curved, along a radius struck from the centre line of the shaft 12, when viewed end-on as in Figs. 1 to 3; and is linear when viewed in side elevation as in Fig. 4. In use, two such jaws contra-rotate about parallel spaced axes to crush the packaging web between them. One jaw, the one illustrated, carries an anvil strip whilst the other, not illustrated, carries a knife.
A channel 16 opens on to the curved packcontacting face 15 of the jaw, and runs partway along the jaw, parallel with the axis about which the shaft 12 rotates. The channel 16 is linear and straight-sided, and is rectangular in section. As this particular jaw has been modified to embody the invention, the channel 16 exhibits opposite end sections 16a, 16b which originally were machined to take a conventional knife or anvil strip. The majority of the channel, other than these opposite-end sections, has been machined out further to incorporate the thickness of the resiliently deformable high-temperature-resistant sheet of silicon rubber with which the jaw is to be faced.
Respective lines of holes 17. 18 are drilled and tapped into the opposite side surfaces of the jaw 11. These holes, as Figs. 2 and 3 show, take headed screws which fasten clamping plates 19, 21 to the jaw sides.
The plates 19, 21 are serrated along their clamping surfaces to grip the opposite end regions of a sheet 22 of the silicon rubber previously referred to. The sheet 22 is initially clamped in place as shown in Fig. 2. An anvil strip 23 is then pressed into the channel 16.
pushing the central region of the rubber sheet 22 into the channel, and locating it there as indicated in Fig. 3.
Opposite-end strips 24, 25 then bear against the stepped ends of the anvil strip 23 and are clamped, by screws 26, 27, firmly but removably in the channel 16. As the screws 26, 27 are driven fully home, the anvil strip 23 is brought down on to the shoulders of the opposite-end channel sections 16a, 16b.
In that position, the anvil strip 23 holds the rubber material 22 in the channel 16 without positively clamping it there. There is no adhesive or other bonding means between the rubber sheet 22 and the curved jaw face 15.
The sheet 22 extends from each side of the anvil strip 23 to effectively fact the curved jaw surface 15.
If the sheet material is properly selected, it need only be relatively thin. A one millimetre or two millimetre thickness may suffice.
Instead of the strip 23 locating a single sheet 22 of material in the channel 16, it could positively trap and clamp the edges of two sheets of material in that channel, each sheet then being clamped at one edge by one of the clamps 19, 21 and at its opposite edge by a face of the strip 23.
Alternatively, one sheet of material could be clamped in the way just outlined, so that only one half of the curved jaw surface 15 was faced with the material.

Claims (12)

1. A heatable jaw for pack-sealing and/or pack-cutting comprising a channel extending substantially the length of the jaw, an elongate pack-contacting anvil or knife strip held removably in the channel, a replaceable sheet of resiliently deformable temperature-resistant material extending across the jaw from one or from each side of the said strip around the edge of the jaw, and means to clamp the material to a non-pack-contacting surface of the jaw.
2. A heatable jaw as claimed in Claim 1, wherein a single sheet of the material is clamped at each of its opposite edge regions to a respective non-pack contacting surface of the jaw, with the anvil or knife strip locating a central region of the material in the channel.
3. A heatable jaw as claimed in Claim 2, wherein the channel is so dimensioned with respect to the dimensions of the anvil or knife strip that the strip locates the material without positively clamping it.
4. A heatable jaw as claimed in Claim 3, wherein the material is not adhered to the pack-contacting jaw surface except by the clamp means, whereby the material is free to roll across the jaw surface under pack-gripping pressure.
5. A heatable jaw as claimed in either Claim 1 or Claim 2, wherein the anvil or knife strip so clamps an edge region of a sheet of the material in the channel that the sheet extends between the channel and the means to clamp another edge region to a non-contacting surface of the jaw.
6. A heatable jaw as claimed in Claim 5, wherein two sheets of the material are so disposed that the material extends across the entire pack-contacting surface of the jaw, each sheet being clamped by the anvil or knife strip at one edge region and by the clamping means at another.
7. A heatable jaw as claimed in any one of the preceding claims, wherein the edge or edges of the jaw around which the material extends are radiused.
8. A heatable jaw as claimed in any one of the preceding claims, wherein the material is a silicone rubber.
9. A heatable jaw as claimed in any one of the preceding claims, wherein the material has a Shore hardness of 80 or less.
10. A heatable jaw as claimed in Claim 9, wherein the Shore hardness of the material is less than 60.
11. A heatable jaw as claimed in Claim 10, wherein the Shore hardness of the material lies within the range of from 40 to 50.
12. A heatable jaw for pack-sealing and/ or pack-cutting substantially as described herein with reference to the accompanying drawings.
GB08230713A 1982-10-27 1982-10-27 Improvements in heated jaws for packaging machinery Withdrawn GB2128928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08230713A GB2128928A (en) 1982-10-27 1982-10-27 Improvements in heated jaws for packaging machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08230713A GB2128928A (en) 1982-10-27 1982-10-27 Improvements in heated jaws for packaging machinery

Publications (1)

Publication Number Publication Date
GB2128928A true GB2128928A (en) 1984-05-10

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GB08230713A Withdrawn GB2128928A (en) 1982-10-27 1982-10-27 Improvements in heated jaws for packaging machinery

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1516206A (en) * 1974-09-04 1978-06-28 Seidenschnur Yacht Bodensee Toilets
EP0010649A1 (en) * 1978-10-24 1980-05-14 Stiegler Gmbh Maschinenfabrik A machine for the manufacture of bags from plastics material with a continuously rotating welding roller
GB2059337A (en) * 1979-09-17 1981-04-23 Nordson Corp Transverse cutting and sealing tubular films

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1516206A (en) * 1974-09-04 1978-06-28 Seidenschnur Yacht Bodensee Toilets
EP0010649A1 (en) * 1978-10-24 1980-05-14 Stiegler Gmbh Maschinenfabrik A machine for the manufacture of bags from plastics material with a continuously rotating welding roller
GB2033833A (en) * 1978-10-24 1980-05-29 Stiegler K Apparatus for welding a web of thermoplastics material
GB2048768A (en) * 1978-10-24 1980-12-17 Stiegler K Apparatus for welding a web of thermoplastics material
GB2059337A (en) * 1979-09-17 1981-04-23 Nordson Corp Transverse cutting and sealing tubular films

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)