GB2116109A - Process for securing together two sheets of fusible material - Google Patents
Process for securing together two sheets of fusible material Download PDFInfo
- Publication number
- GB2116109A GB2116109A GB8304580A GB8304580A GB2116109A GB 2116109 A GB2116109 A GB 2116109A GB 8304580 A GB8304580 A GB 8304580A GB 8304580 A GB8304580 A GB 8304580A GB 2116109 A GB2116109 A GB 2116109A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sheets
- datum
- process according
- fusible material
- fusing
- 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
Links
- 239000000463 material Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000000465 moulding Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 description 16
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 1
- 239000012764 mineral filler Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
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
- B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
-
- 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
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/03—After-treatments in the joint area
- B29C66/032—Mechanical after-treatments
- B29C66/0324—Reforming or reshaping the joint, e.g. folding over
- B29C66/03241—Flattening
- B29C66/03242—Flattening of sheets being positioned in abutment, e.g. after folding open of an overlap joint
-
- 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
- B29C66/43—Joining a relatively small portion of the surface of said 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
- B29C66/41—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
- B29C66/434—Joining substantially flat articles for forming corner connections, fork connections or cross connections
- B29C66/4342—Joining substantially flat articles for forming corner connections, e.g. for making V-shaped pieces
-
- 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
- B29C66/8141—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81411—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 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
- B29C66/81415—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 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
-
- 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
- B29C66/8141—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 surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81411—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 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
- B29C66/81415—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 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
- B29C66/81419—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 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
-
- 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
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
-
- 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
- B29C66/434—Joining substantially flat articles for forming corner connections, fork connections or cross connections
- B29C66/4342—Joining substantially flat articles for forming corner connections, e.g. for making V-shaped pieces
- B29C66/43421—Joining substantially flat articles for forming corner connections, e.g. for making V-shaped pieces with a right angle, e.g. for making L-shaped pieces
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention relates to a process of securing together two sheets 1 and 2 of fusible material comprising fusing the sheets at edges 3 and 4 so as to form a projection 13 (Fig. 3) which extends in the opposite direction away from the edges 3 and 4 to the direction in which the remainder of the sheets extend, and then opening the sheets about the fused edges 3 and 4 to provide a desired angle between the sheets 1 and 2, which may then be fused again to provide a smooth finish. <IMAGE>
Description
SPECIFICATION
Process for securing together two sheets of fusible
material
The invention relates to a process for securing together two sheets of fusible material, and to sheets so fused ane to components made from the fused together sheets.
Sheets of plastics material such as polyvinyl chloride are often secured together by using a welding process such as high frequency welding process. This process is usually only applicable for those sheets up to 1 mum (0.040") thick. For thicker sheets which may be straight polymeric sheets or sheets filled with synthetic fibres or mineral filler the process is not satisfactory where the sheets are to be welded together to form accurately manufactured components which may have a relatively complex shape. This is because in general the sheets to be formed are overlapped and when they are softened under pressure they move laterally apart in a direction transverse to the weld in order to providea substantially 'flat' weld.The resulting movement produces an increase in width over any two sections being joined, the increase being approximately equal to the amount of displaced material. Such increase in width provides dimensional inaccuracies in the finished component. An attempt has been made to combat this by using a welding electrode used in the process to be some two or three times the overlap of the two sheets but this is costly, provides too large a weld and in any event does not in practice obviate the increase in width of the joined sheets.
It is accordingly an object of the invention to provide a process which seeks to mitigate these disadvantages of the prior art.
Accordingly, there is provided in a process for securing together two sheets of fusible material at an angle to one another, the steps of superposing the sheets of fusible material so that each has an edge at which it is to be secured to the other adjacent a common datum and so that both extended in a common direction away from that datum, and fusing the material of the sheets at or adjacent the respective edges so that the material forms a projection which extends away from the datum in a direction opposite the common direction of the sheets away from the datum.
The sheets of material are preferably then moved apart about the fused parts to provide a desired angle between the sheets, and a further fusing operation may be carried out at the previously fused parts to provide a smooth finish.
The step of fusing the material may be a high frequency welding step.
Alternatively, the step fusing the material may be a heat and pressure welding step.
It will be understood that the invention extends to a component formed from two sheets of material secured together by a process as hereinbefore defined.
Using the invention it is possible to provide weld joints of formed components which are sound, and in which the components themselves maintain dimensional stability during the process of securing them together.
A process embodying the invention is hereinbefore described by way of example, with reference to the accompanying drawings.
Fig. 1 is a perspective view of two superimposed sheets of thick plastics material, cut and ready for welding.
Fig. 2 is a schematic side elevational view of a welding step for welding the sheets of Fig. 1 to a greatly enlarged scale as compared with that Fig.;
Fig. 3 shows the welded sheets, again in schematic side elevation;
Fig. 4 is a perspective view of a component formed from the welded sheets of Fig. 3; and
Figs. 5 and 6 show steps in finishing the welds formed respectively at "A" and "B" in Fig. 4.
Referring to the drawings, in order to weld two sheets 1 and 2 of, in this case thick polyvinyl chloride, together as a preliminary to forming a component therefrom, the two sheets 1 and 2 are cut to a desired predetermined size and are superimposed one on the other with edges 3 and 4 at which they are to be secured together terminating at or adjacent the same plane or planes as shown in Fig. 1.
(It will be understood that each sheet has performed form or crease lines 5 pre-welded or otherwise formed therein so that subsequent to welding at edges 3 and 4 the sheets 1 and 2 can be folded about the form or crease lines 5 to provide the required shape of component 6 (Fig. 4) ).
In order to weld the sheets 1 and 2 they are superposed and are placed on a welding table 7 on which is also placed a bar 8 which has a thickness corresponding to half thickness of the two sheets 1 and 2. The sheets 1 and 2 terminate at the right-hand end (as viewed) in the same plane and are brought up against an abutment 9 which forms a datum 8' and which is placed on the bar 8. Both sheets 1 and 2 then extend in the same direction away from the datum 8' (to the left as shown in Fig. 2). A moulding bar 10, which in this case is a high frequency electronic moulding tool, is then brought down as shown by the arrow 'X' to fuse both edges 3 and 4 and so secure the sheets 1 and 2 together along a weld line 11. The bar 10 has a nose or leading edge 12. After a sufficient welding period, the welding bar 10 is retracted in the direction of the arrow "Y".The sheets 1 and 2 are secured together along the weld line 11, there being a "nose" 13 which is symmetrical about the plane of contact 14 between the sheets 1 and 2.
The configuration shown in Fig. 3 is brought about by an inert press bar 15 secured to tool 10 which presses the sheets down to the table 7 while the "nose" adjacent edges 3 and 4 is moulded by the edge 12 above and round the bar 8 and against the abutment 9.
The drawing(s) originally filed was/were informal and the print here reproduced is taken
from a later filed formal copy.
If the material of the sheets 1 and 2 is reinforced with fibre, the excess nose 13 is trimmed off with a knife.
The sheets 1 and 2 of Fig. 3 are then bent outwards about the weld line 11 and are folded upwards about the preformed form or crease lines 5 to form the shape of component 6 shown in Fig. 4. The corner shown at "A" in Fig. 4 and shown enlarged in Fig. 5 has a knife-edge kind of shape 16 andthis is smoothed out by a further welding step using heat and pressure via a welding bar 17 to provide a smooth finish (Fig. 5).
The corner "B" is similarly given a smooth finish using a mould tool 17 as shown in Fig. 6, the nominally 900 angle being set at 92 -95 depending on the thickness of material being used. In both cases the voids 18 under the knife edge 16 receive fused material obtained in the finishing welding steps, that material flowing into the voids and so accommodate that excess material. Thus there is no additional or excess material to cause lateral movement of the parts of the component 6.
Also, the first welding step whereby the sheets 1 and 2 are initially secured together ensures that there is no increase in width of the sheets so that overall the component to be formed retains its dimensional stability, and thus integrity. The process is applicable to the fusing together of a range of thicknesses of sheets for example "thin" sheets, i.e.
up to about 1 mm thick and "thick" sheets, i.e. say 21/2mm thick, whether filled or unfilled, and is applicable to any shape of component other than the
one shown.
Claims (7)
1. In a process for securing together two sheets
of fusible material at an angle to one another, the
steps of superposing the sheets of the fusible
material so that each has an edge at which it is to be secured to the other adjacent a common datum and so that both extend in a common direction away from that datum, and fusing the material of the sheets at or adjacent the respective edges in a controlled manner so that the material forms a projection which extends away from the datum in a direction opposite the common direction of the sheets away from the datum.
2. A process according to Claim 1 or Claim 2, in which the sheets are subsequently moved apart about the fused parts to form a desired angle between the sheets, and a further fusing operation is carried out at the previously fused parts to provide a smooth finish.
3. A process according to Claim 1 or Claim 2, in which the projection is symmetrical about the plane of contact between the sheets of material.
4. A process according to Claim 3, in which the projection is of triangular configuration in transverse cross-section.
5. A process according to any preceding claim, the step of fusing the material comprising a high frequency moulding step.
6. A process of securing together two sheets of fusible material, substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
7. Two sheets of fusible material secured together by a process according to any preceding claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8304580A GB2116109B (en) | 1982-02-23 | 1983-02-18 | Process for securing together two sheets of fusible material |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8205269 | 1982-02-23 | ||
| GB8304580A GB2116109B (en) | 1982-02-23 | 1983-02-18 | Process for securing together two sheets of fusible material |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8304580D0 GB8304580D0 (en) | 1983-03-23 |
| GB2116109A true GB2116109A (en) | 1983-09-21 |
| GB2116109B GB2116109B (en) | 1985-09-04 |
Family
ID=26282053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8304580A Expired GB2116109B (en) | 1982-02-23 | 1983-02-18 | Process for securing together two sheets of fusible material |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2116109B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2576839A1 (en) * | 1985-02-04 | 1986-08-08 | Ilpea Spa | PROCESS FOR THE PRODUCTION OF ROUND AREA FRAMES BASED ON RIGID PLASTIC PROFILES, THE FRAMES SO OBTAINED AND THEIR USE FOR REFRIGERATORS, ESPECIALLY FOR HORIZONTAL FREEZERS |
-
1983
- 1983-02-18 GB GB8304580A patent/GB2116109B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2576839A1 (en) * | 1985-02-04 | 1986-08-08 | Ilpea Spa | PROCESS FOR THE PRODUCTION OF ROUND AREA FRAMES BASED ON RIGID PLASTIC PROFILES, THE FRAMES SO OBTAINED AND THEIR USE FOR REFRIGERATORS, ESPECIALLY FOR HORIZONTAL FREEZERS |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2116109B (en) | 1985-09-04 |
| GB8304580D0 (en) | 1983-03-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
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