EP1390191A1 - Procedure and apparatus for continuous production of corrugated/undulated sheets in a windable web; windable thermoplastic web with transverse corrugations/undulations - Google Patents
Procedure and apparatus for continuous production of corrugated/undulated sheets in a windable web; windable thermoplastic web with transverse corrugations/undulationsInfo
- Publication number
- EP1390191A1 EP1390191A1 EP01949897A EP01949897A EP1390191A1 EP 1390191 A1 EP1390191 A1 EP 1390191A1 EP 01949897 A EP01949897 A EP 01949897A EP 01949897 A EP01949897 A EP 01949897A EP 1390191 A1 EP1390191 A1 EP 1390191A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- forming
- cylinder
- corrugated
- thermoplastic material
- 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- Withdrawn
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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/22—Corrugating
- B29C53/24—Corrugating of plates or sheets
- B29C53/28—Corrugating of plates or sheets transverse to direction of feed
- B29C53/285—Corrugating of plates or sheets transverse to direction of feed using rolls or endless bands
Definitions
- the invention refers to the field of sheets or plates of undulated or corrugated plastic material, as are currently in widespread use in the construction industry, for packaging, for do-it-yourself and for numerous other uses.
- the corrugated thermoplastic materials currently on the market are produced continuously via a process which includes a step of plasticization of the thermoplastic material with an extruder, a step of rolling of the web through a flat head and a calender, a subsequent step of deformation of the web according to shapes with axes longitudinal to the web, through a series of roller trains which transform the section of the web from planar to longitudinally corrugated.
- this production system allows only the formation of corrugated sheets with longitudinal ribs (corrugations). Said webs, on account of their shape, cannot be wound into rolls, and therefore they are cut into sheets and stacked for storage and transport, with the drawback of requiring a greater percentage of overlapping in use.
- windable corrugated webs of fibreglass material which are produced with corrugations at right angles to the direction of production by means involving a process of impregnation of a textile support, which is then subjected to drying so that the resin hardens.
- Such a production process is not applicable to thermoplastic materials.
- the objects of the present invention are to obtain a windable corrugated web of thermoplastic material and allow production on an industrial scale of web products of corrugated thermoplastic material sheet that can be wound in a roll.
- the invention provides a web of thermoplastic material, however produced, which is corrugated transversely to the length thereof. It further provides a production process whereby a continuous web of thermoplastic material is extruded with simultaneous on-line extrusion, or alternatively produced separately and fed with a roll of pre-extruded thermoplastic material, in suitable conditions of temperature, and subsequently formed with corrugations having a transverse axis with respect to the direction of extrusion-feeding, namely to the longitudinal direction of the web, in a cylinder assembly which operates with the aid of a suction system. The web is then trimmed along the longitudinal edges thereof.
- the apparatus of the invention comprises a cylinder assembly, a forming cylinder of which has channel shapes extending substantially parallel to the axis of the cylinder and communicating with a vacuum system, and a so-called drawing cylinder that has elongated protrusions parallel to the axis of the cylinder and collaborates with the forming cylinder to form the corrugations of the web.
- the invention allows to overcome the drawbacks of the prior art, and in particular forms a windable corrugated web and allows production of a continuous web of corrugated sheet material that can be wound in a roll, with consequent advantages as regards transport and storage. Furthermore it provides a process for producing corrugated webs and panels that can be wound in a roll, with resulting advantages as far as transport and storage are concerned. Furthermore it provides a process for production of corrugated webs and panels that is economically competitive.
- Figures 1, 2, 3 and 4 are perspective views of portions of corrugated plastic web, as can be obtained by the present invention
- Figure 5 is a perspective view of corrugated web according to the present invention, wound in a roll around a core;
- Figure 6 is a part sectional elevational view of a calender for shaping the web
- Figure 7 is a diagrammatic side elevational view, with parts removed, of the calender of
- Figure 6 is a sectional view of a forming cylinder of the calender, taken along plane 8-8 of figure 9, perpendicular to the axis of the roller itself;
- Figure 9 is a side elevational view of the forming cylinder;
- Figure 10 is a broken off axial section through the forming cylinder
- Figure 11 shows, in a broken-off sectional view taken in a plane perpendicular to the respective axes, a collaborating drawing cylinder and forming cylinder, for forming a fret-type corrugated web,
- Figure 12 shows, in a section similar to that of Figure 11, a collaborating drawing cylinder and forming cylinder, for forming wave-type corrugated web,
- Figure 13 is a broken off perspective view of a web of material leaving the calender, before longitudinal trimming of the sides along the dashed lines.
- Figures 1 and 4 show portions of wave shaped (Figs 1 and 2) or fret shaped (Figs 3, 4) corrugated web or panels, of extruded thermoplastic material, as can be obtained according to the present invention.
- corrugated panels were per se known to the art prior to the invention, it was not known prior thereto to form said panels with the corrugations having their axis transverse to the direction of travel, or of extrusion, of the plastic material used for the panel. Said direction of travel and/or of extrusion is indicated by an arrow in Figures 1-4.
- Figure 5 shows a web lb wound in a roll around a core 2, and said figure shows both the arrangement of the undulations of the web, transverse to the longitudinal direction of said web, and one of the advantages of the invention, that is to say the possibility of winding the web produced.
- the apparatus 10 comprises, on a framework 12, a forming cylinder 14 having a horizontal axis, a cooperating cylinder 16 collaborating in forming, henceforth called
- drawing cylinder for the sake of brevity, having a horizontal axis, and an accompanying or cooling cylinder 18 having a horizontal axis.
- the three cylinders or rollers are carried on respective shafts designated with reference numerals 20, 22 and 24, respectively, and these are carried rotatingly on the framework in bushings that can be moved vertically thereon. The details of said assembly are not explained here in that they are well within the reach of a person skilled in the art.
- Each shaft has an articulated connection, 26, 28, 30 with respective drive means for the drive unit, which in the example in the figure comprises a motor 32 connected to reduction gears 34, 36, 38.
- a forming cylinder 14 is shown in greater detail in Figures 8, 9, 10.
- each groove is defined, in a longitudinal direction, by surfaces, shaped like an arc of a circle, for example; that is to say, the cylinder 14 has the axially outermost parts 43 smooth and not grooved, preferably at the same level as the land parts 42.
- the cylinder casing has a plurality of axially extending conduits 45, 46, for communicating with a vacuum source. Said conduits 45, 46 communicate through small holes 47, 48 with the grooves 41 and the lands 42.
- suction or vacuum system is not further described because it can be of any known type.
- the shape of the forming cylinder with grooves or lands defines the shape of the web produced.
- the cylinder in Figure 8 for example, will produce a zigzag or fret shaped corrugated web.
- a preferred drawing cylinder 16 for collaboration with the corrugated cylinder 14 is illustrated in Figures 6 to 11 and is part of this invention.
- the drawing cylinder 16 comprises a plurality of cylindrical or tubular elements 52 having their axes parallel to the axis of the cylinder, supported and connected with cooling tubes 54 of a same length.
- the circumferential distance between the elements 52 is correlated to the distance and the shape of the grooves 41 of the forming cylinder with which the drawing cylinder is to collaborate.
- the length of the tubular elements 52 is about equal to the useful length of the grooves 41.
- Figure 12 illustrates a forming cylinder 14a, with grooves 41a and lands 42a, for forming a wave shaped corrugated web.
- the forming cylinder 14a has a shape in side view similar to that shown for the cylinder 14 in Figure 9, and has the same vacuum application system with small holes 47a and 48a.
- a drawing cylinder 16a has a shape with lands 52a alternating with valleys 51a, of a shape and length correlated with the grooves 41a and the protrusions or lands 42a of the forming cylinder, and turns with the lands or protrusions 52a thereof alternating with the lands 42a of the forming cylinder.
- a cylinder with tubes like that described previously could be used equally advantageously.
- the cooling cylinder 18 can have a similar shape to that of the forming cylinder or can be smooth and serves to support and guide the web as it emerges.
- thermoplastic material is extruded by a traditional extrusion head, referenced E in Figure 6.
- the extrusion head (or alternatively any means feeding a web of thermoplastic material in suitable temperature conditions) is positioned in the vicinity of the upper surface of the forming cylinder 14, so that the force of gravity acting on the web collaborates to dispose said web close to the surface of the forming cylinder.
- the extruded web thus settles on the uppermost surface of the cylinder 14 and is pulled against said surface by vacuum generated by the vacuum system and applied to the grooves 41 through the conduits 45, 46 and the holes 47, 48. It should be noted that vacuum application is made possible by the fact that the grooves 41 are closed at the ends, that is to say completely surrounded by the raised parts 42, 43.
- Forming of the web is completed by the collaboration of the forming cylinder and the drawing cylinder 16 which rotate in opposite directions.
- the lands of the drawing cylinder enter partially into the grooves 41 of the forming cylinder, further pushing the material against the surface thereof.
- the web emerging from the nip between the forming cylinder and the drawing cylinder is shaped as illustrated in Figure 13, that is to say it has smooth longitudinal edges and a corrugated longitudinal part with corrugations having a transverse axis.
- the web preferably then passes on the cylinder 18 which guides it to the outlet, possibly cooling it in a per se known manner.
- the web undergoes trimming along the longitudinal edges, that is to say, the side parts without grooves which were formed on contact with the raised parts 43 of the cylinder 14 are cut away from the web. Scrap material can be recycled.
- a product is obtained as shown in Figure 1, or in Figure 2 or in Figure 3 or 4 or other, according to the cylinder configuration used.
- the drawing cylinder with peripheral tubes can be used to collaborate with a plurality of forming cylinders with different shapes.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2001MI001108A ITMI20011108A1 (it) | 2001-05-25 | 2001-05-25 | Procedimento e apparecchiatura di produzione in continuo di lastre ondulate/ grecate in nastro avvolgibile; nastro termoplastico avvolgibile |
ITMI20010110 | 2001-05-25 | ||
PCT/IT2001/000342 WO2002094538A1 (en) | 2001-05-25 | 2001-06-27 | Procedure and apparatus for continuous production of corrugated/undulated sheets in a windable web; windable thermoplastic web with transverse corrugations/undulations |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1390191A1 true EP1390191A1 (en) | 2004-02-25 |
Family
ID=11447756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01949897A Withdrawn EP1390191A1 (en) | 2001-05-25 | 2001-06-27 | Procedure and apparatus for continuous production of corrugated/undulated sheets in a windable web; windable thermoplastic web with transverse corrugations/undulations |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1390191A1 (it) |
IL (1) | IL159007A0 (it) |
IT (1) | ITMI20011108A1 (it) |
WO (1) | WO2002094538A1 (it) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTV20030019A1 (it) * | 2003-02-07 | 2004-08-08 | Habasit Italiana Spa | Procedimento ed apparecchiatura per sagomare in continuo una piattina in materiale plastico secondo un profilo ondulato. |
CN103068270B (zh) | 2010-07-16 | 2015-06-03 | 杰拉尔德·罗查 | 具有三维柔性的粘扣带 |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2429482A (en) * | 1939-04-06 | 1947-10-21 | Munters Carl Georg | Method and means for the production of foil material |
US2480316A (en) * | 1944-11-11 | 1949-08-30 | Mishawaka Rubber & Woolen Mfg | Method of making laminated cushion material |
GB1376782A (en) * | 1972-02-22 | 1974-12-11 | Atomic Energy Authority Uk | Apparatus for welding together superimposed sheets of thermoplastic material |
US3837973A (en) * | 1972-07-07 | 1974-09-24 | Toyo Kagaku Kk | Apparatus for continuously producing corrugated plastic board |
SE387574B (sv) * | 1973-03-13 | 1976-09-13 | Munters Ab Carl | Sett att i kontinuerlig produktion framstella en bana av tunt termoplastiskt material |
DE2535444C2 (de) * | 1975-08-08 | 1983-11-17 | Röhm GmbH, 6100 Darmstadt | Verfahren zum Biegen einer Platte aus thermoplastischem Kunststoff |
US3982868A (en) * | 1975-10-14 | 1976-09-28 | The B. F. Goodrich Company | Continuous mold thermo forming |
DD122795A1 (it) * | 1975-11-11 | 1976-11-05 | ||
US4228209A (en) * | 1978-06-06 | 1980-10-14 | Chavannes Marc A | Wire reinforced corrugated board and method and apparatus for making same |
DE2916248A1 (de) * | 1979-04-21 | 1980-10-30 | Phoenix Ag | Vorrichtung zum herstellen von wellenfoermigen wandteilen aus kunststoffplatten |
FR2663621B2 (fr) * | 1990-04-30 | 1993-05-21 | Capy Gilbert | Dispositif de resserrage progressif de plis dissymetriques, realises a partir d'un film, prealablement preformes sur une roue dentee. |
-
2001
- 2001-05-25 IT IT2001MI001108A patent/ITMI20011108A1/it unknown
- 2001-06-27 EP EP01949897A patent/EP1390191A1/en not_active Withdrawn
- 2001-06-27 IL IL15900701A patent/IL159007A0/xx unknown
- 2001-06-27 WO PCT/IT2001/000342 patent/WO2002094538A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO02094538A1 * |
Also Published As
Publication number | Publication date |
---|---|
IL159007A0 (en) | 2004-05-12 |
WO2002094538A1 (en) | 2002-11-28 |
ITMI20011108A0 (it) | 2001-05-25 |
ITMI20011108A1 (it) | 2002-11-25 |
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Legal Events
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17P | Request for examination filed |
Effective date: 20031210 |
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AX | Request for extension of the european patent |
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17Q | First examination report despatched |
Effective date: 20041217 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20050428 |