NO143199B - METHOD AND APPARATUS FOR MANUFACTURING THIN WALL WASTED PLASTICS - Google Patents
METHOD AND APPARATUS FOR MANUFACTURING THIN WALL WASTED PLASTICS Download PDFInfo
- Publication number
- NO143199B NO143199B NO753316A NO753316A NO143199B NO 143199 B NO143199 B NO 143199B NO 753316 A NO753316 A NO 753316A NO 753316 A NO753316 A NO 753316A NO 143199 B NO143199 B NO 143199B
- Authority
- NO
- Norway
- Prior art keywords
- web material
- rollers
- chamber
- web
- temperature
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 14
- 239000004033 plastic Substances 0.000 title claims description 11
- 229920003023 plastic Polymers 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 239000000463 material Substances 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000003856 thermoforming Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims description 2
- 210000000056 organ Anatomy 0.000 claims 1
- -1 polypropylene Polymers 0.000 description 7
- 239000004743 Polypropylene Substances 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- 239000002985 plastic film Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000035622 drinking Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
- B29B13/023—Half-products, e.g. films, plates
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/06—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam for articles of indefinite length
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/049—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using steam or damp
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Description
Den foreliggende oppfinnelse vedrører en fremgangsmåte til fremstilling av tynnveggete gjenstander av plastmateriale som har et forholdsvis snevert temperaturområde hvori plastmaterialet kan formes ved termoforming, hvor et kontinuerlig banemateriale av plast oppvarmes ved bestrålingsoppvarming stort sett til optimal termoformingstemperatur, hvoretter det således oppvarmete banemateriale, mens det ennå er i varm tilstand, tilføres trinnvis med avbrudd i fremføringen mellom hvert trinn til et termoformingsapparat og gjenstandene som skal fremstilles termoformes under nevnte avbrudd i frem-føringen . The present invention relates to a method for the production of thin-walled objects made of plastic material which has a relatively narrow temperature range in which the plastic material can be formed by thermoforming, where a continuous web material made of plastic is heated by radiation heating largely to the optimum thermoforming temperature, after which the thus heated web material, while still is in a hot state, is fed step by step with interruptions in the advance between each step to a thermoforming apparatus and the objects to be produced are thermoformed during said interruptions in the advance.
Oppfinnelsen omfatter også et apparat til utførelse av The invention also includes an apparatus for performing
fremgangsmåten, hvor apparatet er utstyrt med the method with which the device is equipped
bestrålingsorganer for oppvarming av banematerialet, organer for fremføring av banematerialet trinnvis gjennom området med bestrålingsorganer og gjennom et termoformingsapparat med avbrudd i fremdriften mellom hvert trinn, irradiating means for heating the web material, means for advancing the web material step by step through the area with irradiating means and through a thermoforming apparatus with interruptions in progress between each step,
idet termoformingsapparatet er innrettet til å motta banematerialet mens det ennå er i oppvarmet tilstand og til å termoforme gjenstandene i nevnte banemateriale i løpet av nevnte avbrudd i fremføringen. the thermoforming apparatus being arranged to receive the web material while it is still in a heated state and to thermoform the objects in said web material during said interruption in the advance.
Vilkårlig egnet teknikk såsom vakuumforming, trykkfor-ming, ved hjelp av tapper eller ved mekanisk forming eller en vilkårlig kombinasjon av disse teknikker kan benyttes ved formingen av gjenstandene, men i alle fall oppvarmes arkmaterialet for å bevirke en grad av mykhet i materialet slik at dette kan formes, og derfor vil formingen av gjenstandene enkelt og generelt bli benevnt "termoforming". Arbitrarily suitable techniques such as vacuum forming, pressure forming, using pins or mechanical forming or an arbitrary combination of these techniques can be used when forming the objects, but in any case the sheet material is heated to produce a degree of softness in the material so that this can be shaped, and therefore the shaping of the objects will simply and generally be called "thermoforming".
Termoforming er velkjent og benyttes i stor utstrekning, og mange termoformete gjenstander er i daglig bruk i mange land i verden, idet slike gjenstander omfatter hule husholdnings- Thermoforming is well known and widely used, and many thermoformed objects are in daily use in many countries around the world, as such objects include hollow household
gjenstander og drikkebegre. objects and drinking glasses.
Visse materialer, særlig polypropylen, polyetylen og eks-panderte plastark krever termoforming ved meget nøyaktige temperaturer for å oppnå hurtig produksjon og høykvalitetsproduk-ter. Vanlige fremgangsmåter for oppvarming, såsom infrarødt-varmeapparater, gir ikke tilstrekkelig nøyaktig oppvarming til å oppnå disse ønskelige egenskaper selv om arkene som skal termoformes har jevn tykkelse, noe som i praksis ikke er vanlig. Certain materials, in particular polypropylene, polyethylene and expanded plastic sheets, require thermoforming at very precise temperatures to achieve rapid production and high-quality products. Common methods of heating, such as infrared heaters, do not provide sufficiently accurate heating to achieve these desirable properties even if the sheets to be thermoformed are of uniform thickness, which is not common in practice.
Når oppvarmingen utføres ved bestråling krøller dessuten mange typer plastark seg eller siger ved oppvarmingen, noe som bevirker enda større temperaturvariasjoner i det oppvarmete ark. When the heating is carried out by irradiation, many types of plastic sheet also curl or sag during the heating, which causes even greater temperature variations in the heated sheet.
Formålet med den foreliggende oppfinnelse er å frembringe en fremgangsmåte for oppvarming som er brukbar for en lang rekke plastark omfattende polystyren, akrylnitril-butadien-styren-harpiks, akrylnitril, nylon, polyester, polyvinylklorid, cellu-loseacetat, såkalt "fylt" plastmateriale som omfatter plast og uorganisk partikkelformet materiale, faktisk ethvert ark som kan termoformes, og hvor ovennevnte ulemper elimineres eller minskes. The purpose of the present invention is to produce a method for heating which is usable for a wide range of plastic sheets comprising polystyrene, acrylonitrile-butadiene-styrene resin, acrylonitrile, nylon, polyester, polyvinyl chloride, cellulose acetate, so-called "filled" plastic material which includes plastic and inorganic particulate material, in fact any sheet which can be thermoformed, and where the above disadvantages are eliminated or reduced.
Dette er ifølge fremgangsmåten oppnådd ved at banematerialet, for å kompensere for temperaturvariasjoner som oppstår som følge av variasjoner i banematerialets tykkelse og variasjoner i oppvarming, underkastes en passasje om en rulleanordning som er oppvarmet til nevnte optimale temperatur for derved å sørge for en jevn temperaturfordeling i banematerialet. According to the method, this is achieved in that the track material, in order to compensate for temperature variations that occur as a result of variations in the track material's thickness and variations in heating, is subjected to a passage around a rolling device that is heated to the aforementioned optimum temperature in order to thereby ensure an even temperature distribution in the track material.
Apparatet kjennetegnes ved The device is characterized by
en rulleanordning som banematerialet kan passere over etter at det har forlatt området med bestrålingsorganer, og a rolling device over which the track material can pass after it has left the area of irradiation means, and
anordninger til oppvarming av rulleanordningen til en forhåndsbestemt temperatur. means for heating the roller device to a predetermined temperature.
Oppvarming av banen ved berøring med den oppvarmete rulleanordning og varm gass og/eller damp sikrer jevn oppvarming i hele dens bredde, og banen kan ikke i noe punkt nå en temperatur som er høyere enn rulleanordningens eller gassens og/eller dampens temperatur. Heating of the web by contact with the heated roller device and hot gas and/or steam ensures uniform heating throughout its width, and the web cannot at any point reach a temperature higher than the temperature of the roller device or the gas and/or steam.
Fortrinnsvis er rulleanordningen anbrakt i et kammer som inneholder oppvarmet gass og/eller damp, og banen føres inn i og ut av kammeret horisontalt og i samme plan, og rulleanordningen kan omfatte tre ruller hvis akser løper horisontalt, Preferably, the roller device is placed in a chamber containing heated gas and/or steam, and the web is led into and out of the chamber horizontally and in the same plane, and the roller device may comprise three rollers whose axes run horizontally,
idet to av rullene ligger over den tredje rulle og er anbrakt in that two of the rolls lie above the third roll and are placed
symmetrisk i forhold til et vertikalplan gjennom den tredje rulle. Hver rulle oppvarmes fortrinnsvis ved å sirkulere varm olje gjennom den. symmetrical in relation to a vertical plane through the third roll. Each roll is preferably heated by circulating hot oil through it.
Banen løper over og om den ene av de øvre ruller, om den nedre rulle og om og over den andre, øvre rulle slik at det beskrives en bane som har nevnte vertikalplan som en symmetriakse. Rullene har fortrinnsvis slik størrelse og er anbrakt slik at begge banens sider når den løper gjennom kammeret er i jevn berøring med rullene. The track runs over and around one of the upper rollers, around the lower roller and around and over the other, upper roller so that a track is described which has the aforementioned vertical plane as an axis of symmetry. The rollers preferably have this size and are placed so that both sides of the web when it runs through the chamber are in uniform contact with the rollers.
Det kan være anordnet innløps- og utløpsanordninger hvori-gjennom gassen og/eller dampen kan tilføres og fjernes fra kamrene. Inlet and outlet devices may be arranged through which the gas and/or steam can be supplied and removed from the chambers.
Rullenes temperatur og temperaturen i gassen og/eller dampen vil fortrinnsvis termostatreguleres for å sikre at banen holdes på den kritiske temperatur. Det korteste tidsrom banen må være i kammeret for å nå den ønskete temperatur vil avhenge av banens dimensjoner, men i alle tilfeller kan dette tidsrom reguleres slik at det passer for materialet som oppvarmes. The temperature of the rolls and the temperature of the gas and/or steam will preferably be thermostatically regulated to ensure that the web is kept at the critical temperature. The shortest time the web must be in the chamber to reach the desired temperature will depend on the dimensions of the web, but in all cases this time can be regulated so that it is suitable for the material being heated.
Det er ikke noen maksimumsoppvarmingstid, idet banens temperatur ikke kan bli høyere enn kammerets temperatur. There is no maximum warm-up time, as the track's temperature cannot be higher than the chamber's temperature.
Gjenstander, såsom hule husholdningsgjenstander, fremstilt av polypropylen oppvarmet på denne måte kan fremstilles drifts-sikkert i store mengder, og av gjennomsnittlig store antall har de utmerket overflate, seighet og klarhet, som er bedre enn disse egenskaper hos konvensjonelt fremstilte polypropylen-gjenstander. Articles, such as hollow household articles, made of polypropylene heated in this way can be reliably produced in large quantities, and of average large numbers they have excellent surface, toughness and clarity, which are better than these properties of conventionally made polypropylene articles.
Det er ifølge oppfinnelsen således frembrakt en enkel fremgangsmåte hvorved plastmateriale i baneform kan oppvarmes jevnt, noe som muliggjør effektiv anvendelse av plastmaterialer såsom polyolefiner, f.eks. polypropylen, til termoformete gjenstander fremstilt i stort antall. Syklustiden kan gjøres meget kort, og i mange tilfeller kan det fremstilles en billigere, According to the invention, a simple method has thus been developed by which plastic material in web form can be heated evenly, which enables the efficient use of plastic materials such as polyolefins, e.g. polypropylene, for thermoformed objects produced in large quantities. The cycle time can be made very short, and in many cases a cheaper,
men likevel bedre gjenstand. but still better object.
Oppfinnelsen vil bli nærmere forklart i det etterfølgende ved hjelp av et utførelseseksempel under henvisning til den medfølgende tegning som viser et snitt gjennom varmekammeret. The invention will be explained in more detail below by means of an embodiment with reference to the accompanying drawing showing a section through the heating chamber.
Varmekammeret er dannet av et skap med frem- og bakvegger 10 og 12, tak 14 og bunn 16, samt to sidevegger hvorav bare den ene sidevegg 18 er vist, idet figuren er et snitt. Fremveggen er oventil utstyrt med en innløpsåpning 20, mens bakveggen 12 The heating chamber is formed by a cabinet with front and back walls 10 and 12, roof 14 and bottom 16, as well as two side walls of which only one side wall 18 is shown, as the figure is a section. The front wall is equipped at the top with an inlet opening 20, while the rear wall 12
er utstyrt med en utløpsåpning 22. Disse åpninger 20 og 22 is equipped with an outlet opening 22. These openings 20 and 22
flukter horisontalt og muliggjør passering av en termoformbar bane 24, såsom en bane av polypropylen, slik at denne kommer inn i kammeret gjennom åpningen 2 0 og forlater det gjennom åpningen 22. flows horizontally and enables the passage of a thermoformable web 24, such as a web of polypropylene, so that this enters the chamber through the opening 20 and leaves it through the opening 22.
Fremveggen 10 og bakveggen 12 er også utstyrt med innløp 2 6 for gassformet- og/eller dampformet varmemedium. I dette eksempel er varmemediet luft. I bruk føres oppvarmet luft kontinuerlig inn i kammeret gjennom innløpet 26 og trekkes ut med avtrekksrør 28 som er anbrakt over og under innløpsåpningen 2 0 og over og under utløpsåpningen 22. The front wall 10 and the back wall 12 are also equipped with inlets 2 6 for gaseous and/or steam heating medium. In this example, the heating medium is air. In use, heated air is continuously fed into the chamber through the inlet 26 and drawn out with an exhaust pipe 28 which is placed above and below the inlet opening 20 and above and below the outlet opening 22.
Inne i kammeret befinner det seg tre oppvarmete ruller 30, 32 og 34. Disse ruller er anbrakt med sine akser parallelle og horisontale, og rullene 30 og 32 er anbrakt på et høyere nivå enn rullen 34. Rullene 3 0 og 32 er anbrakt symmetrisk om et vertikalplan gjennom rullens 34 akse. Disse ruller varmes opp ved å sirkulere oppvarmet olje gjennom deres hule indre, men deres omkretsflater er metalliske for å bevirke god varmeled-ning fra rulleflatene til banen 24 som er i berøring med dem. Etter å ha passert infrarødt-forvarmerne 36 løper banen 24 som vist over rullen 30, om rullen 34 og deretter over rullen 32. Banen forlater kammeret gjennom utløpsåpningen 22, og det frem-går at banens innløpsstrekk og dens utløpsstrekk ligger i samme horisontalplan i forhold til kammeret. Inside the chamber there are three heated rollers 30, 32 and 34. These rollers are placed with their axes parallel and horizontal, and the rollers 30 and 32 are placed at a higher level than the roller 34. The rollers 30 and 32 are placed symmetrically about a vertical plane through the roll's 34 axis. These rollers are heated by circulating heated oil through their hollow interior, but their peripheral surfaces are metallic to effect good heat conduction from the roller surfaces to the web 24 which is in contact with them. After passing the infrared preheaters 36, the web 24 runs, as shown, over the roller 30, around the roller 34 and then over the roller 32. The web leaves the chamber through the outlet opening 22, and it appears that the inlet section of the web and its outlet section lie in the same horizontal plane in relation to the chamber.
Temperaturene i rullene og i kammeret holdes innenfor nøyaktige grenser for å sikre at banen 24 varmes opp til en jevn temperatur slik at den vil være egnet til å føres direkte fra utløpet 22 til en termoformingsmaskin hvor gjenstandene termoformes fra banen 24. Disse temperaturer vil bli regulert både ved sirkulasjon av miljøet i kammeret og oljen i oppvarmings-rullene, og det vil bli anvendt egnete termostater for å opprettholde disse temperaturer innenfor nøyaktige grenser. F.eks. kan luften som innføres gjennom innløpene 26 være på 160°C for polypropylenark, og rullene 30, 32 og 34 ville bli holdt på samme temperatur. The temperatures in the rolls and in the chamber are kept within precise limits to ensure that the web 24 is heated to a uniform temperature so that it will be suitable to be fed directly from the outlet 22 to a thermoforming machine where the articles are thermoformed from the web 24. These temperatures will be regulated both by circulation of the environment in the chamber and the oil in the heating rollers, and suitable thermostats will be used to maintain these temperatures within precise limits. E.g. the air introduced through the inlets 26 may be at 160°C for polypropylene sheets, and the rolls 30, 32 and 34 would be maintained at the same temperature.
Størrelsene på rullene og deres plassering velges fortrinnsvis slik at når banen 24 passerer gjennom apparatet vil det være samme berøring mellom rulle og bane på hver side av banen til enhver tid, og rullene 30, 34 og 32 kan drives med litt høyere hastighet i nevnte rekkefølge for å kompensere for eventuell utvidelse av banen 24 i lengderetningen som kan forégå under oppvarmingen og for å sikre at banen 24 forblir i god berøring med rullene. Dessuten er det mulig å ha rullene 30, 34 og 32 anbrakt slik at det dannes spalter mellom rullene 3 0 og 34 på den ene side og mellom rullene 34 og 32 på den annen side for å bevirke eller hjelpe til med føring av banen gjennom kammeret. The sizes of the rollers and their location are preferably chosen so that when the web 24 passes through the apparatus there will be the same contact between roller and web on each side of the web at all times, and the rollers 30, 34 and 32 can be driven at a slightly higher speed in that order to compensate for any longitudinal expansion of the web 24 which may occur during heating and to ensure that the web 24 remains in good contact with the rollers. Furthermore, it is possible to have the rollers 30, 34 and 32 positioned so that gaps are formed between the rollers 30 and 34 on the one hand and between the rollers 34 and 32 on the other hand to effect or assist in guiding the web through the chamber .
Selv om den foretrukne konstruksjon av apparatet er be-skrevet, skal det forstås at modifikasjoner kan foretas uten å avvike fra rammen for oppfinnelsen. F.eks. ville det være mulig å frembringe et apparat hvor det er anordnet to ruller, slik at banen løper i "S"-form om disse ruller og har like stor berøring mellom bane og rulle på hver side av banen. Dessuten kan kammeret inneholde egne avbøyningsanordninger for å sikre at den varme luft som innføres i kammeret vil bli ledet mot rullene. Although the preferred construction of the apparatus has been described, it should be understood that modifications can be made without departing from the scope of the invention. E.g. would it be possible to produce an apparatus where two rollers are arranged, so that the track runs in an "S" shape if these rollers have an equal amount of contact between track and roller on each side of the track. In addition, the chamber can contain its own deflection devices to ensure that the hot air introduced into the chamber will be directed towards the rollers.
Claims (6)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB42888/74A GB1505820A (en) | 1974-10-03 | 1974-10-03 | Manufacture of thin walled plastics material articles |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO753316L NO753316L (en) | 1976-04-06 |
| NO143199B true NO143199B (en) | 1980-09-22 |
| NO143199C NO143199C (en) | 1981-01-07 |
Family
ID=10426405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO753316A NO143199C (en) | 1974-10-03 | 1975-10-01 | PROCEDURE AND APPARATUS FOR MANUFACTURING THIN WALL WASTED PLASTIC ART. |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS5163864A (en) |
| BE (1) | BE834136A (en) |
| BR (1) | BR7506470A (en) |
| CA (1) | CA1055667A (en) |
| CH (1) | CH608740A5 (en) |
| DE (1) | DE2544042A1 (en) |
| DK (1) | DK440875A (en) |
| ES (1) | ES441450A1 (en) |
| FR (1) | FR2286698A1 (en) |
| GB (1) | GB1505820A (en) |
| IT (1) | IT1043066B (en) |
| NL (1) | NL7511619A (en) |
| NO (1) | NO143199C (en) |
| NZ (1) | NZ178835A (en) |
| SE (1) | SE407031B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2473888A1 (en) * | 1980-01-17 | 1981-07-24 | Erca | METHOD AND DEVICE FOR STERILIZING A THERMOPLASTIC STRIP FOR THE THERMOFORMING OF STERILE CONTAINERS AND STERILE PACKAGING INSTALLATION USING SAID METHOD AND DEVICE |
| DE3311988C1 (en) * | 1983-04-02 | 1984-04-19 | Adolf Illig Maschinenbau Gmbh & Co, 7100 Heilbronn | Preheater for heating a sheet of thermoplastic material |
| DE3926089A1 (en) * | 1989-08-07 | 1991-02-14 | Hassia Verpackung Ag | THERMOFORMING MACHINE WITH A FILM LEAD INPUT PREHEATING DEVICE |
| DE102015005066B4 (en) * | 2015-04-21 | 2021-12-16 | Illig Maschinenbau Gmbh & Co. Kg | A method of moving a web of thermoplastic plastic film through a preheater to heat a web of thermoplastic plastic film |
-
1974
- 1974-10-03 GB GB42888/74A patent/GB1505820A/en not_active Expired
-
1975
- 1975-09-30 DK DK440875A patent/DK440875A/en not_active Application Discontinuation
- 1975-10-01 FR FR7530583A patent/FR2286698A1/en active Granted
- 1975-10-01 NZ NZ178835A patent/NZ178835A/en unknown
- 1975-10-01 NO NO753316A patent/NO143199C/en unknown
- 1975-10-02 BE BE160642A patent/BE834136A/en unknown
- 1975-10-02 CA CA236,876A patent/CA1055667A/en not_active Expired
- 1975-10-02 NL NL7511619A patent/NL7511619A/en not_active Application Discontinuation
- 1975-10-02 ES ES441450A patent/ES441450A1/en not_active Expired
- 1975-10-02 DE DE19752544042 patent/DE2544042A1/en not_active Withdrawn
- 1975-10-02 CH CH7512907A patent/CH608740A5/en not_active IP Right Cessation
- 1975-10-02 IT IT27888/75A patent/IT1043066B/en active
- 1975-10-03 JP JP50119680A patent/JPS5163864A/ja active Pending
- 1975-10-03 SE SE7511105A patent/SE407031B/en unknown
- 1975-10-03 BR BR7506470*A patent/BR7506470A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR7506470A (en) | 1976-08-10 |
| DK440875A (en) | 1976-04-04 |
| ES441450A1 (en) | 1977-07-01 |
| SE407031B (en) | 1979-03-12 |
| NZ178835A (en) | 1978-03-06 |
| JPS5163864A (en) | 1976-06-02 |
| IT1043066B (en) | 1980-02-20 |
| CA1055667A (en) | 1979-06-05 |
| NO753316L (en) | 1976-04-06 |
| CH608740A5 (en) | 1979-01-31 |
| BE834136A (en) | 1976-02-02 |
| FR2286698B1 (en) | 1980-04-25 |
| FR2286698A1 (en) | 1976-04-30 |
| NO143199C (en) | 1981-01-07 |
| DE2544042A1 (en) | 1976-04-15 |
| GB1505820A (en) | 1978-03-30 |
| SE7511105L (en) | 1976-04-05 |
| NL7511619A (en) | 1976-04-06 |
| AU8535575A (en) | 1977-04-07 |
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