GB1600133A - Dielectric heat welding supported polymeric leathercloth - Google Patents

Dielectric heat welding supported polymeric leathercloth Download PDF

Info

Publication number
GB1600133A
GB1600133A GB7732/77A GB773277A GB1600133A GB 1600133 A GB1600133 A GB 1600133A GB 7732/77 A GB7732/77 A GB 7732/77A GB 773277 A GB773277 A GB 773277A GB 1600133 A GB1600133 A GB 1600133A
Authority
GB
United Kingdom
Prior art keywords
pieces
straps
panel
material
strap
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.)
Expired
Application number
GB7732/77A
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.)
AMALGAMATED LIGHTING (WAITE) Ltd
AMALGAMATED LIGHTING WAITE
Original Assignee
Amalgamated Lighting Waite
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 Amalgamated Lighting Waite filed Critical Amalgamated Lighting Waite
Priority to GB7732/77A priority Critical patent/GB1600133A/en
Publication of GB1600133A publication Critical patent/GB1600133A/en
Application status is Expired legal-status Critical

Links

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
    • 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
    • B29C66/47Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • AHUMAN NECESSITIES
    • A45HAND OR TRAVELLING ARTICLES
    • A45CPURSES; LUGGAGE; HAND CARRIED BAGS
    • A45C3/00Flexible luggage; Handbags
    • A45C3/001Flexible materials therefor
    • 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
    • B29C65/04Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • 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
    • B29C66/70General 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
    • B29C66/72General 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 structure of the material of the parts to be joined
    • B29C66/723General 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 structure of the material of the parts to be joined being multi-layered
    • 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
    • B29C66/832Reciprocating joining or pressing tools
    • B29C66/8322Joining or pressing tools reciprocating along one axis
    • 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
    • B29C66/70General 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
    • B29C66/71General 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2027/00Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/06PVC, i.e. polyvinylchloride
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00Layered products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/7418Suitcases

Description

(54) DIELECTRIC HEAT WELDING SUPPORTED POLYMERIC LEATHER CLOTH (71) We, AMALGAMATED LIGHTING (WAITE) LIMITED, a British Company of Menin Works, Bond Road, Mitcham, Surrey, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to dielectric heat welding supported polymeric leathercloth.

'Supported polymeric leathercloth' means herein a textile material comprising natural and/or man made fibres coated on one side with, and thereby supporting, polymeric material to resemble the appearance of leather.

Supported polymeric leathercloth, typically supported p.v.c. leathercloth in which a textile supporting, or backing, material supports a layer of foamed p.v.c provided with a solid p.v.c. top skin remote from the supporting material and resembling the appearance of leather, has been used for some time for the straps and side panels of so-called 'soft' luggage, the straps being stitched onto the side panels in overlying relationship therewith with the backing of the strap adjacent the polymeric material of the panel.

However stitching is time consuming and can result in unacceptable tolerances in the alignment of the straps on the side panels because of the relatively large size of the panels and the associated difficulties in handling them during stitching, and can result in unsightly overstitching.

With a view to overcoming the abovementioned disadvantages we contemplated dielectric heat welding a piece of supported polymeric leathercloth forming a strap onto another piece of such material forming a side panel instead of stitching, but the degree of fusing between the polymeric material of the strap piece and the side panel was inadequate because of the presence therebetween of the backing of the strap piece.

We have now discovered that dielectric heat welding can be successfully used to secure two layers of supported polymeric material together if the layers are arranged with their polymeric material innermost and their backings outermost.

In accordance with the present invention there is provided a method of securing pieces of supported polymeric leathercloth (as hereinbefore defined) together, including joining two overlying pieces with their backings innermost and their polymeric material outermost, thereafter arranging a further piece in at least partially overlapping relationship with said joined pieces with the polymeric material of one of said joined pieces adjacent the polymeric material of the further piece between cooperating electrodes of dielectric heat welding apparatus and operating said apparatus to fuse said polymeric material of said further piece and said one of said joined pieces together.

The method defined in the last preceding paragraph is particularly, although not exclusively, applicable to securing a strap of a travel case to a side panel thereof, the strap being formed by said joined pieces and the panel forming said further piece.

The invention also includes an article in which pieces of supported polymeric leathercloth (as hereinbefore defined) are secured together by a method as defined in the last but one preceding paragraph.

In order that the invention may be well understood, an embodiment thereof which is given by way of example only, will now be described, reference being made to the accompanying drawings, in which: Figure 1 is a perspective view of a travel case; Figure 2 is an enlarged cross-seetion of one of the straps of the case; Figure 3 is a schematic elevational crosssection through heat welding apparatus for securing the straps to a side panel of the case; Figure 4 is a plan view of a jig for positioning the straps and side panel prior to heat welding; and Figure 5 illustrates the area of heat welds between the straps and the panel.

Referring to the drawings, there is shown in Figure 1 a travel case 1 including a side panel 2 of a cotton backed p,v.c. leathercloth material to which are secured by dielectric heat welding three straps 3, 4 and 5.

Each strap is formed of two overlying pieces 6, 7 of similar material which are joined as shown in Figure 2 with their cotton backings 8 innermost, or adjacent, and their p.v.c. layers 9 outermost. The pieces 6, 7 are joined together by double rows of stitching 10 as indicated at 11 in Figure 2 which in the finished case gives the appearance of the strap being sewn onto the side panel (see Figure 1) rather than heat welded thereto.

The straps are heat welded to the side panel by means of high frequency dielectric heat welding apparatus schematically illustrated at 12 in Figure 3 and comprising electrodes 13 and 14. Electrode 13 is an earthed bed, and electrode 14, often referred to as an arc, is moveable towards and away from the bed.

A jig 15 (Figure 4) is located on the bed 13 in a predetermined position and the straps are positioned in respective cut-outs 16. Thereafter, the piece of material forming the side panel 2 is located in the main cut-out 17 with its p.v.c. layer downmost adjacent the straps.

Thus the straps are positioned on the bed 13 under the side panel 2, the panel being in overlapping relationship with strap 3 and in partially overlapping relationship with straps 4 and 5.

The electrodes 14 are moved into engagement with the backing of the side panel to press the panel against the straps and to fuse the p.v.c. layer of the side panel piece and the adjacent p.v.c. layers of the straps.

It is the electrodes or anodes 14 rather than the bed which tends to become warm during operation, and by arranging for the anodes 14 to contact the backing rather than the p.v.c.

material of the straps, which would be the case if the straps were positioned on top of the panel instead of under it, spoiling of the p.v.c. material which typically has a grain effect, or flattening the material, is avoided.

Also the problem of the anodes sticking to the p.v.c. material is avoided.

The anodes 14 have flat working surfaces which enable the fusing to extend over a large area. Further, the working surfaces of the anodes overlap the edges of the straps so as to provide a tolernace in the alignment of the anodes and the straps which avoids the problem of the strap edges turning up if an edge of an electrode acts just inside a strap edge.

In the embodiment the anodes are recessed at 18 and 19 in order to reduce the area of the weld to an area within the capacity of the machine used. The resulting areas of weld 20 and 21 are indicated with cross-hatching in Figure 5.

It is possible for air to be expanded and trapped in the areas 22 and 23 within the weld area between the backings 8 of the pieces of material forming the straps to cause a slight bubble, and in order to obviate this the recess of the electrode may be filled in with a non-conductive material (not illustrated) which engages the panel momentarily before and during welding.

Advantageously, the jig may be formed with the same rules that cut out the panel and strap pieces to ensure accurate location for these pieces.

It will be appreciated that as well as enabling the straps to be secured more accurately on the panel than if stitching were used, the described method enables the time taken in securing them to be drastically reduced. The appearance of the straps being stitched to the panels is achieved since the pieces forming the straps are stitched together, this operation being acceptable since the size of the pieces enables them to be easily handled.

It is to be understood that the described method of securing pieces of supported polymeric material together is applicable to the manufacture of items other than travel cases although it has been described in relation to such manufacture.

WHAT WE CLAIM IS: 1. A method of securing pieces of supported polymeric leathercloth (as hereinbefore defined) together, including joining two overlying pieces with their backings innermost and their polymeric material outermost, thereafter arranging a further piece in at least partially overlapping relationship with said joined pieces with the polymeric material of one of said joined pieces adjacent the polymeric material of the further piece between cooperating electrodes of dielectric heat welding apparatus and operating said apparatus to fuse said polymeric material of said further piece and said one of said joined pieces together.

2. A method as claimed in claim 1, wherein said electrodes comprise a bed of the apparatus and an electrode movable towards and away therefrom, and wherein said joined pieces and said further piece are positioned on said bed with said further piece in said at least partially overlapping relationship with said joined pieces.

3. A method as claimed in claim 2, wherein said joined pieces are positioned under said further piece on said bed such that said movable electrode engages the backing of said further pieces during operation of said apparatus.

4. A method as claimed in claim 2 or 3, wherein said movable electrode overlaps said joined pieces.

5. A method as claimed in any one of claims 1 to 4 when used for securing a strap to a panel of a travel case, said strap being formed by said joined pieces and said panel forming said further piece.

6. A method of securing two pieces of

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. material to which are secured by dielectric heat welding three straps 3, 4 and 5. Each strap is formed of two overlying pieces 6, 7 of similar material which are joined as shown in Figure 2 with their cotton backings 8 innermost, or adjacent, and their p.v.c. layers 9 outermost. The pieces 6, 7 are joined together by double rows of stitching 10 as indicated at 11 in Figure 2 which in the finished case gives the appearance of the strap being sewn onto the side panel (see Figure 1) rather than heat welded thereto. The straps are heat welded to the side panel by means of high frequency dielectric heat welding apparatus schematically illustrated at 12 in Figure 3 and comprising electrodes 13 and 14. Electrode 13 is an earthed bed, and electrode 14, often referred to as an arc, is moveable towards and away from the bed. A jig 15 (Figure 4) is located on the bed 13 in a predetermined position and the straps are positioned in respective cut-outs 16. Thereafter, the piece of material forming the side panel 2 is located in the main cut-out 17 with its p.v.c. layer downmost adjacent the straps. Thus the straps are positioned on the bed 13 under the side panel 2, the panel being in overlapping relationship with strap 3 and in partially overlapping relationship with straps 4 and 5. The electrodes 14 are moved into engagement with the backing of the side panel to press the panel against the straps and to fuse the p.v.c. layer of the side panel piece and the adjacent p.v.c. layers of the straps. It is the electrodes or anodes 14 rather than the bed which tends to become warm during operation, and by arranging for the anodes 14 to contact the backing rather than the p.v.c. material of the straps, which would be the case if the straps were positioned on top of the panel instead of under it, spoiling of the p.v.c. material which typically has a grain effect, or flattening the material, is avoided. Also the problem of the anodes sticking to the p.v.c. material is avoided. The anodes 14 have flat working surfaces which enable the fusing to extend over a large area. Further, the working surfaces of the anodes overlap the edges of the straps so as to provide a tolernace in the alignment of the anodes and the straps which avoids the problem of the strap edges turning up if an edge of an electrode acts just inside a strap edge. In the embodiment the anodes are recessed at 18 and 19 in order to reduce the area of the weld to an area within the capacity of the machine used. The resulting areas of weld 20 and 21 are indicated with cross-hatching in Figure 5. It is possible for air to be expanded and trapped in the areas 22 and 23 within the weld area between the backings 8 of the pieces of material forming the straps to cause a slight bubble, and in order to obviate this the recess of the electrode may be filled in with a non-conductive material (not illustrated) which engages the panel momentarily before and during welding. Advantageously, the jig may be formed with the same rules that cut out the panel and strap pieces to ensure accurate location for these pieces. It will be appreciated that as well as enabling the straps to be secured more accurately on the panel than if stitching were used, the described method enables the time taken in securing them to be drastically reduced. The appearance of the straps being stitched to the panels is achieved since the pieces forming the straps are stitched together, this operation being acceptable since the size of the pieces enables them to be easily handled. It is to be understood that the described method of securing pieces of supported polymeric material together is applicable to the manufacture of items other than travel cases although it has been described in relation to such manufacture. WHAT WE CLAIM IS:
1. A method of securing pieces of supported polymeric leathercloth (as hereinbefore defined) together, including joining two overlying pieces with their backings innermost and their polymeric material outermost, thereafter arranging a further piece in at least partially overlapping relationship with said joined pieces with the polymeric material of one of said joined pieces adjacent the polymeric material of the further piece between cooperating electrodes of dielectric heat welding apparatus and operating said apparatus to fuse said polymeric material of said further piece and said one of said joined pieces together.
2. A method as claimed in claim 1, wherein said electrodes comprise a bed of the apparatus and an electrode movable towards and away therefrom, and wherein said joined pieces and said further piece are positioned on said bed with said further piece in said at least partially overlapping relationship with said joined pieces.
3. A method as claimed in claim 2, wherein said joined pieces are positioned under said further piece on said bed such that said movable electrode engages the backing of said further pieces during operation of said apparatus.
4. A method as claimed in claim 2 or 3, wherein said movable electrode overlaps said joined pieces.
5. A method as claimed in any one of claims 1 to 4 when used for securing a strap to a panel of a travel case, said strap being formed by said joined pieces and said panel forming said further piece.
6. A method of securing two pieces of
supported polymeric leathercloth (as hereinbefore defined) together substantially as herein described with reference to the accompanying drawings.
7. An article in which pieces of supported polymeric leathercloth (as hereinbefore defined) are secured together by a method as claimed in any one of the preceding claims.
8. A travel case having at least one strap secured to a panel thereof by a method as claimed in claim 5.
GB7732/77A 1978-04-12 1978-04-12 Dielectric heat welding supported polymeric leathercloth Expired GB1600133A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7732/77A GB1600133A (en) 1978-04-12 1978-04-12 Dielectric heat welding supported polymeric leathercloth

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7732/77A GB1600133A (en) 1978-04-12 1978-04-12 Dielectric heat welding supported polymeric leathercloth

Publications (1)

Publication Number Publication Date
GB1600133A true GB1600133A (en) 1981-10-14

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GB7732/77A Expired GB1600133A (en) 1978-04-12 1978-04-12 Dielectric heat welding supported polymeric leathercloth

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GB (1) GB1600133A (en)

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US20160236849A1 (en) * 2014-02-07 2016-08-18 Yeti Coolers, Llc Insulating Device
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USD798670S1 (en) 2016-02-05 2017-10-03 Yeti Coolers, Llc Insulating device
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