NO137428B - PROCEDURE FOR CONTINUOUS PREPARATION OF BIAXIALLY STRETCHED SHRINK FOILS AND APPARATUS FOR EXERCISING METHODS - Google Patents
PROCEDURE FOR CONTINUOUS PREPARATION OF BIAXIALLY STRETCHED SHRINK FOILS AND APPARATUS FOR EXERCISING METHODS Download PDFInfo
- Publication number
- NO137428B NO137428B NO3068/72A NO306872A NO137428B NO 137428 B NO137428 B NO 137428B NO 3068/72 A NO3068/72 A NO 3068/72A NO 306872 A NO306872 A NO 306872A NO 137428 B NO137428 B NO 137428B
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- Prior art keywords
- nozzle
- roller set
- pinch roller
- pinch
- platform
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 11
- 239000011888 foil Substances 0.000 title description 11
- 238000001816 cooling Methods 0.000 claims description 18
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000010924 continuous production Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229920006300 shrink film Polymers 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 claims description 2
- 229920006255 plastic film Polymers 0.000 claims description 2
- 241000270295 Serpentes Species 0.000 claims 1
- 239000000463 material Substances 0.000 description 3
- 238000010073 coating (rubber) Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
-
- 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
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/06—Making preforms having internal stresses, e.g. plastic memory
- B29C61/08—Making preforms having internal stresses, e.g. plastic memory by stretching tubes
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Transmission Devices (AREA)
- Wrappers (AREA)
- Packages (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
Description
Den foreliggende oppfinnelse vedrører en fremgangsmåte The present invention relates to a method
til kontinuerlig fremstilling av biaksialt strukkete krympefolier av en plastfolieslange som leveres fra en ekstruder, for the continuous production of biaxially stretched shrink films from a plastic film tube delivered from an extruder,
hvor dét i et første trinn tilføres et gassformet trykkmedium til slangens indre, hvoretter den oppblåste slange sammentrykkes lokalt ved hjelp av to sett klemvalser, nemlig et klemvalsesett nær ekstruderens ringdyse som er omgitt av en kjølering, og et klemvalsesett som ligger borte fra ringdysen, slik at det dannes en mellomboble og to ytterbobler, hvor valsesettene løper med forskjellig periferihastighet, og klemvalsesettet ved dysen kan reguleres med hensyn til avstanden fra dysen. where, in a first step, a gaseous pressure medium is supplied to the interior of the hose, after which the inflated hose is compressed locally by means of two sets of pinch rollers, namely a pinch roller set near the extruder's ring nozzle which is surrounded by a cooling ring, and a pinch roller set which is away from the ring nozzle, as that an intermediate bubble and two outer bubbles are formed, where the roller sets run at different peripheral speeds, and the pinch roller set at the nozzle can be regulated with regard to the distance from the nozzle.
Fra US-patentskrift 3.466.356 er det kjent en fremgangsmåte av ovennevnte type, hvor det anvendes et apparat som mellom dysen og oppviklingsvalsen har fire klemvalsesett, hvorav det andre valsesett, regnet i den ekstruderte slanges fremførings-retning, kan utføre en peristaltisk bevegelse, idet dets valser, når det beveger seg mot det tredje valsesett, lokalt trykker .slangen sammen, men under returløpet går fri av slangen. Denne peristaltiske bevegelse må foregå vedvarende, altså.ikke ute-lukkende ved startingen av apparatet. Dette skyldes at det ved det tredje valsesett finnes en lekkasje. Ifølge den foreliggende oppfinnelse foreligger det ikke noen lekkasje mellom valsene, From US patent 3,466,356, a method of the above-mentioned type is known, where an apparatus is used which between the nozzle and the winding roller has four pinch roller sets, of which the second roller set, calculated in the direction of advance of the extruded hose, can perform a peristaltic movement, as its rollers, as it moves towards the third set of rollers, locally compress the hose, but during the return run the hose is freed. This peristaltic movement must take place continuously, i.e. not exclusively at the start of the device. This is because there is a leak at the third roller set. According to the present invention, there is no leakage between the rollers,
idet disse har et gummibelegg med passende Shore-hårdhet. Oppfinnelsen tar derfor ikke sikte på løsning av et lekkasjepro-blem. Den vedrører derimot passende kjøling av slangen innen denne når det klemvalsesett som ligger nærmest dysen. Dersom det kjente apparats arbeidsprinsipp skulle anvendes i forbind-else med et apparat med bare to klemvalsesett, ville dette med-føre uheldig og vilkårlig og i mange tilfeller utilfredsstillende kjøling av slangen i klemvalsesettet nærmest dysen. Kjøleluften fra kjøleringen om dysen skal nemlig ha mulighet til å følge as these have a rubber coating with suitable Shore hardness. The invention therefore does not aim at solving a leakage problem. On the other hand, it relates to suitable cooling of the hose before it reaches the pinch roller set closest to the nozzle. If the working principle of the known apparatus were to be used in connection with an apparatus with only two pinch roller sets, this would lead to unfortunate and arbitrary and in many cases unsatisfactory cooling of the hose in the pinch roller set closest to the nozzle. The cooling air from the cooling ring around the nozzle must be able to follow
slangen en ganske bestemt lengde dersom kjølingen skal bli best mulig. Dersom slangen f.eks. har stor diameter, må det nærmeste the hose a fairly specific length if the cooling is to be as good as possible. If the hose e.g. has a large diameter, the nearest must
klemvalsesett ligge forholdsvis langt fra dysens kjølering, mens dette klemvalsesett må ligge forholdsvis nær kjøleringen når slangediameteren er liten. pinch roller set is relatively far from the nozzle's cooling ring, while this pinch roller set must be relatively close to the cooling ring when the hose diameter is small.
Fra britisk patentskrift 814.723 er det kjent en fremgangsmåte hvor det anvendes bare to klemvalsesett. Det sett som ligger nærmest dysen er bevegelig, mens det som ligger lengst borte, er .stasjonært., Med dette apparat er det ikke mulig å oppnå både riktig ytre luftkjøling av slangen og riktig opp-bygging av trykket i boblen mellom de to klemvalsesett. Dersom man både vil.ha riktig kjøling og riktig trykk i boblen, må From British patent document 814,723, a method is known in which only two pinch roller sets are used. The set closest to the nozzle is movable, while the one furthest away is stationary. With this device, it is not possible to achieve both the correct external air cooling of the hose and the correct build-up of the pressure in the bubble between the two pinch roller sets. If you want both the right cooling and the right pressure in the bubble, you must
man stoppe apparatet, skille valsene i nærmeste sett fra hverandre og tilføre trykkluft til. slangens indre gjennom et eget rør, hvore.tter valsene i det nærmeste sett må føres sammen igjen. Denne kompliserte operasjon unngås helt ifølge oppfinnelsen. stop the device, separate the rollers in the nearest set from each other and supply compressed air. the inside of the hose through a separate pipe, after which the rollers in the nearest set must be brought together again. This complicated operation is completely avoided according to the invention.
Formålet med den foreliggende oppfinnelse er å anvise en fremgangsmåte og et apparat av den ovennevnte type, som ved hjelp, av meget enkle, midler muliggjør trykkøkning i mellomboblen, sl.ik; at foliens strekkforhold i tverretningen blir passende stort, uten at luftkjølingen av slangen forringes. The purpose of the present invention is to provide a method and an apparatus of the above-mentioned type, which by means of very simple means enables an increase in pressure in the intermediate bubble, such as; that the tension ratio of the foil in the transverse direction is suitably large, without the air cooling of the hose being impaired.
Fremgangsmåten ifølge oppfinnelsen kjennetegnes ved at klemvalsesettet, som befinner seg borte fra ringdysen, føres mot det nærmeste klemvalsesett mens den lokale sammentrykking foregår og straks etter at de tre bobler er dannet, og føres et så langt stykke, at trykket i mellomboblen bringes opp på en verdi som er tilpasset til slangematérialet. The method according to the invention is characterized by the pinch roller set, which is located away from the ring nozzle, being moved towards the nearest pinch roller set while the local compression takes place and immediately after the three bubbles are formed, and is moved for such a long distance that the pressure in the intermediate bubble is brought up to a value that is adapted to the hose material.
Derved oppnås at trykket i mellomboblen under oppstarting av apparatet på meget enkel måte kan bringes opp på en passende stor.verdi, som avhenger av slangematérialet, og denne trykk-regulering kan foregå uten at luftkjølingen av ytterboblen mellom dysen og det nærmeste klemvalsesett forstyrres.. Det forholdsvis store trykk i mellomboblen sikrer at denne spiles ut passende og at derved strekkforholdet i slangens tverretning blir passende stort. Strekkingen av folien i lengderetningen frembringes ved at de to klemvalsesett løper med forskjellig periferihastighet. Strekkingen foregår for. øvrig ved en så lav temperatur .(avhengig av slangematérialet) , at de spenninger som opptrer "innfryses". Slangen som fremstilles av folien ser normal ut, men har nå en latent krympeevne. Når folien senere anvendes til emballering, anbringes den først utenpå varen, hvoretter den oppvarmes til den førstnevnte temperatur. Derved vil folien bli bløt og dens indre spenninger utlignes, idet den trekker seg sammen. Denne sammentrekking foregår både i lengde- og tverr-retningen, hvorved folien vil føye seg tett inn til varen. Thereby it is achieved that the pressure in the intermediate bubble during start-up of the device can be brought up to a suitable value in a very simple way, which depends on the hose material, and this pressure regulation can take place without disturbing the air cooling of the outer bubble between the nozzle and the nearest pinch roller set. The relatively large pressure in the intermediate bubble ensures that this is expanded appropriately and that thereby the stretch ratio in the transverse direction of the hose becomes suitably large. The stretching of the foil in the longitudinal direction is produced by the two pinch roller sets running at different peripheral speeds. The stretching takes place for otherwise at such a low temperature (depending on the hose material) that the stresses that occur are "frozen". The hose produced from the foil looks normal, but now has a latent shrinking ability. When the foil is later used for packaging, it is first placed on the outside of the item, after which it is heated to the first-mentioned temperature. Thereby, the foil will become soft and its internal tensions will be equalised, as it contracts. This contraction takes place both in the longitudinal and transverse directions, whereby the foil will fit tightly into the product.
Oppfinnelsen vedrører også et apparat til utførelse av fremgangsmåten, omfattende to sett klemvalser, som er innrettet til å dreie med forskjellig hastighet, og som er anbrakt mellom eri ekstruders ringdyse som er utstyrt med en kjølering, og en oppviklingsvalse, og hvor det klemvalsesett som ligger nærmest dysen er regulerbart med hensyn til avstanden fra dysen. The invention also relates to an apparatus for carrying out the method, comprising two sets of pinch rollers, which are arranged to rotate at different speeds, and which are placed between the ring nozzle of the extruder, which is equipped with a cooling ring, and a winding roller, and where the pinch roller set is located closest to the nozzle is adjustable with respect to the distance from the nozzle.
Dette apparat kjennetegnes ved at det klemvalsesett som ligger lengst fra dysen er innrettet til å beveges mot klemvalsesettet som ligger nærmest dysen, idet det er montert på en plattform som er utstyrt med indre gjennombrytninger og som er bevegelig langs gjengete stenger. Med dette apparat kan fremgangsmåten ifølge oppfinnelsen utøves på meget enkel måte, idet det bortre klemvalsesett sikrer nøyaktig innstilling av trykket i mellomboblen, uten at luftkjølingen av ytterboblen mellom dysen og det nærmeste klemvalsesett forringes. This apparatus is characterized by the fact that the pinch roller set which is farthest from the nozzle is arranged to move towards the pinch roller set which is closest to the nozzle, as it is mounted on a platform which is equipped with internal openings and which is movable along threaded rods. With this apparatus, the method according to the invention can be carried out in a very simple way, as the outer pinch roller set ensures accurate setting of the pressure in the intermediate bubble, without the air cooling of the outer bubble between the nozzle and the nearest pinch roller set being impaired.
Ifølge oppfinnelsen kan de gjengete stenger være ført gjennom plattformen som ved sin underside ut for hver stang kan ha et ringformet spor som løper om den enkelte stang, mens det på hver stang kan være montert et dreibart, innvendig gjenget bevegelsesorgan som ved sin mot plattformen vendende side har et rundtgående fremspring som kan samvirke med sporet. Derved oppnås en meget nøyaktig innstilling av det bortre klemvalsesett. According to the invention, the threaded rods can be led through the platform, which can have an annular groove on its underside, which runs around the individual rod, while a rotatable, internally threaded movement member can be mounted on each rod, which on its side facing the platform side has a circumferential protrusion that can interact with the track. Thereby, a very precise setting of the far pinch roller set is achieved.
Oppfinnelsen vil bli forklart i det etterfølgende under hen-visning til de medfølgende tegninger, hvori: Fig. 1 viser skjematisk en utførelsesform av apparatet ifølge oppfinnelsen, sett fra siden, hvor det i forhold til ekstruderens ringdyse borterste sett klemvalser kan beveges vertikalt. The invention will be explained in the following with reference to the accompanying drawings, in which: Fig. 1 schematically shows an embodiment of the apparatus according to the invention, seen from the side, where in relation to the ring nozzle of the extruder the farthest set of pinch rollers can be moved vertically.
Fig. 2 viser det i fig. 1 viste apparat sett forfra. Fig. 2 shows that in fig. 1 showed the device seen from the front.
Fig. 3 viser et perspektivriss av en transportenhet for bevegelse av et sett klemvalser. Fig. 4 viser et vertikalsnitt gjennom en vertikal stang og den omgivende plattform med tilhørende tannhjul. Fig. 5 viser en annen utførelsesform av apparatet ifølge oppfinnelsen, hvor det ene klemvalsesett kan beveges horisontalt. Fig. 3 shows a perspective view of a transport unit for moving a set of pinch rollers. Fig. 4 shows a vertical section through a vertical rod and the surrounding platform with associated gears. Fig. 5 shows another embodiment of the apparatus according to the invention, where the one pinch roller set can be moved horizontally.
Apparat som vises i fig. 1 består av en ekstruder 1 som Apparatus shown in fig. 1 consists of an extruder 1 which
er utstyrt med en ringdyse 2 og en kjølering 3, som tilføres kjøleluft på i og for seg kjent måte. Ovenfor dysen 2 er det montert to klemvalsesett, nemlig et nærmeste klemvalsesett 4 og et borterste klemvalsesett 5. Valsene 5 kan liksom valsene 4 beveges fra hverandre og mot hverandre i horisontalplanet. Fra ringdysen ekstruderes det en plastfolieslange.som når valsene 4 og 5 er ført bort fra hverandre vil være 'uten innsnevringer. Gjennom et gasstilførselsrør 6 tilføres det en gass, f.eks. luft, til slangens indre. Valsesettet 5 kan også beveges i vertikal retning slik at det.bringes til å innta den ved 5' viste' stil-ling (er. vist streket).. Når valsene .i valsesettene 4 og 5 hver for seg klemmer sammen folieslangen, dannes det to ytterbobler 7 og 9 samt en mellomboble 10, hvor ytterboblen 9 oventil avgrenses.av en pppviklingsvalse 11 som.den strukkete folie kan oppvikles på, mens ytterboblen 7 nedentil avgrenses av dysen. is equipped with a ring nozzle 2 and a cooling ring 3, which is supplied with cooling air in a manner known per se. Two pinch roller sets are mounted above the nozzle 2, namely a nearest pinch roller set 4 and a furthest pinch roller set 5. The rollers 5, like the rollers 4, can be moved apart and towards each other in the horizontal plane. A plastic foil tube is extruded from the ring nozzle, which when the rollers 4 and 5 are moved away from each other will be without constrictions. Through a gas supply pipe 6, a gas is supplied, e.g. air, to the inside of the hose. The roller set 5 can also be moved in a vertical direction so that it is brought to assume the position shown at 5 (shown dashed). When the rollers in the roller sets 4 and 5 individually squeeze the foil hose together, it forms two outer bubbles 7 and 9 as well as an intermediate bubble 10, where the outer bubble 9 is bounded above by a ppp winding roller 11 on which the stretched foil can be wound, while the outer bubble 7 is bounded below by the nozzle.
Strekkingen av folien i lengderetningen frembringes ved The stretching of the foil in the longitudinal direction is produced by
at klemvalsesettet 5 på i og for seg kjent måte løper med større periferihastighet enn klemvalsesettet 4, men strekkingen i tyerr-retningen frembringes ved at valsesettet 5 etter at valsene i valsesettet 4 og valsene i valsesettet 5'hver for seg er trykket sammen om- slangen, beveges vertikalt nedad til stillingen 5'. Boblen 10 vil derved forandre form, slik at den får større diameter, se den med.. strek-prikket linje viste boble 10' i fig. 1. Luften som befinner seg i mellomboblen 10' vil være effektivt innelukket, idet den ikke kan slippe ut ved klemvalsene 4 eller klemvalsene 5. Disse har nemlig et gummibelegg med forholdsvis stor Shore-hårdhet. Den strekning som klemvalsesettet 5 kan beveges nedad er merket med a. Så snart det øverste klemvalsesett er brakt ned i stillingen 5', som er dets egentlige arbeids-stilling, kan den kontinuerlige produksjon av biaksialt strukket krympefolie begynne. that the pinch roller set 5 in a manner known per se runs at a greater peripheral speed than the pinch roller set 4, but the stretching in the tyerr direction is produced by the roller set 5 after the rollers in the roller set 4 and the rollers in the roller set 5' have each been pressed together around the hose , is moved vertically downwards to the position 5'. The bubble 10 will thereby change shape, so that it has a larger diameter, see the bubble 10' shown by the dash-dotted line in fig. 1. The air that is in the intermediate bubble 10' will be effectively enclosed, as it cannot escape at the pinch rollers 4 or the pinch rollers 5. These have a rubber coating with relatively high Shore hardness. The stretch that the pinch roller set 5 can move downwards is marked with a. As soon as the top pinch roller set has been brought down to position 5', which is its actual working position, the continuous production of biaxially stretched shrink film can begin.
Av fig. 2, som tilsvarer fig. 1, sees det også hvordan mel-lomboblens 10' diameter økes, se ved linjen 10', når klemvalsesettet 5 beveges strekningen a nedad til stillingen 5'. From fig. 2, which corresponds to fig. 1, it can also be seen how the diameter of the intermediate bubble 10' is increased, see at the line 10', when the pinch roller set 5 moves the section a downwards to the position 5'.
I fig. 3 vises en transportenhet 15 for bevegelse av klemvalsesettet 4 oppad og nedad i forhold, til ringdysen 2. Enheten består av en plattform 16 som er utstyrt med et.rektangulært hull 17 hvori klemvalsesettet 5 er montert. Eventuelt kan valsesettet In fig. 3 shows a transport unit 15 for moving the pinch roller set 4 upwards and downwards in relation to the ring nozzle 2. The unit consists of a platform 16 which is equipped with a rectangular hole 17 in which the pinch roller set 5 is mounted. Optionally, the roller set can
4 være montert på en tilsvarende plattform, hvorved dette valse- 4 be mounted on a corresponding platform, whereby this rolling
sett lettvint kan reguleres. Enheten 15 beveges langs fire gjengete stenger 18, idet den har fire hull 19, se fig. 4, som har litt større diameter enn stengene 18. På plattformens 16 underside 20 er det påsveiset en ringformet del 21 som har et midtre hull 22 med samme diameter som hullet 19 og som ved sin underside er utstyrt med et ringformet spor 23. I dette spor griper det inn et ringformet fremspring 24 som befinner seg på over-siden av et bevegelsesorgan 25 som er utformet som et kjedehjul. Dette kjedehjul har et midtre, gjenget hull som kan samvirke med stangens 18 utvendige gjenger, noe som betyr at plattformen vil beveges oppad og nedad langs stangen når kjedehjulet 2 5 dreies. Under denne dreining vil fremspringet 24 gli i sporet 23. I fig. 3 er bare kjedehjulene på de to fremste stenger 18 synlig. De trekkes rundt av en rundtgående kjede 26 som selv trekkes av et kjedehjul 27 som er montert på en elektromotors 28 aksel 29. Denne, motor er festet til plattformen 16 ved hjelp av passende festeorganer 30. Av hensyn til figurenes klarhet er de drivorganer som trekker valsene i klemvalsesettene 4 og 5 ikke vist. Det er ingenting i veien for at transportenheten 15 kan beveges hydraulisk. I dette tilfelle er plattformen 16 forbundet med stemplene som hører til noen ikke viste sylindere som kan tilføres trykkvæske. can easily be regulated. The unit 15 is moved along four threaded rods 18, as it has four holes 19, see fig. 4, which has a slightly larger diameter than the rods 18. On the underside 20 of the platform 16 is welded an annular part 21 which has a central hole 22 with the same diameter as the hole 19 and which is equipped on its underside with an annular groove 23. In this track, an annular projection 24 which is located on the upper side of a movement member 25 which is designed as a sprocket engages. This sprocket has a central, threaded hole which can cooperate with the rod's 18 external threads, which means that the platform will move up and down along the rod when the sprocket 25 is turned. During this rotation, the protrusion 24 will slide in the groove 23. In fig. 3, only the sprockets on the two leading bars 18 are visible. They are pulled around by a circular chain 26 which itself is pulled by a sprocket 27 which is mounted on the shaft 29 of an electric motor 28. This motor is attached to the platform 16 by means of suitable fastening means 30. For reasons of clarity of the figures, the drive means which pull the rollers in pinch roller sets 4 and 5 not shown. There is nothing in the way of the transport unit 15 being hydraulically moved. In this case, the platform 16 is connected to the pistons belonging to some cylinders not shown which can be supplied with pressure fluid.
En folie som er velegnet til biaksial strekking ifølge oppfinnelsen er polyolefinfolie. Den beste krympeevne oppnås dersom strekkforholdet i både lengderetning og tverretning ligger på A film which is suitable for biaxial stretching according to the invention is polyolefin film. The best shrinking ability is achieved if the stretch ratio in both the longitudinal and transverse directions is
5:3. Dé endelige strekkforhold vil være noe større idet det også foregår en strekking i ytterboblene. 5:3. The final stretching ratio will be somewhat greater as stretching also takes place in the outer bubbles.
Istedenfor å være anbrakt over hverandre kan de to klemvalsesett være anbrakt side om side, slik at det ene sett kan beveges horisontalt. Dette fremgår av fig. 5 hvor det ene sett klemvalser 5 kan beveges horisontalt hen til 5", slik at mellomboblen 10 utvides i tverretningen og antar fasonen 10". Valsesettet 5 er også i dette tilfelle montert på en transportenhet. Denne er skjematisk antydet ved 33 og kan beveges frem og til-bake horisontalt. Eventuelt kan de samvirke med en fast, hori-sontal tannstang 32. Valsesettet 4 er regulerbart slik som i fig. 1. Instead of being placed one above the other, the two pinch roller sets can be placed side by side, so that one set can be moved horizontally. This is evident from fig. 5, where one set of pinch rollers 5 can be moved horizontally to 5", so that the intermediate bubble 10 expands in the transverse direction and assumes the shape 10". The roller set 5 is also in this case mounted on a transport unit. This is schematically indicated at 33 and can be moved back and forth horizontally. Optionally, they can cooperate with a fixed, horizontal rack 32. The roller set 4 is adjustable as in fig. 1.
Claims (3)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK426371AA DK125973B (en) | 1971-08-31 | 1971-08-31 | Method for continuous production of biaxially stretched shrink films and apparatus for performing the method. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO137428B true NO137428B (en) | 1977-11-21 |
| NO137428C NO137428C (en) | 1978-03-01 |
Family
ID=8131863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO3068/72A NO137428C (en) | 1971-08-31 | 1972-08-30 | PROCEDURE FOR CONTINUOUS PREPARATION OF BIAXIALLY STRETCHED SHRIMP FILMS AND APPARATUS FOR EXERCISING THE PROCEDURE |
Country Status (12)
| Country | Link |
|---|---|
| JP (2) | JPS4834969A (en) |
| BE (1) | BE788153A (en) |
| CA (1) | CA975516A (en) |
| DE (1) | DE2240903C2 (en) |
| DK (1) | DK125973B (en) |
| FI (1) | FI55142C (en) |
| FR (1) | FR2150917B1 (en) |
| GB (1) | GB1390430A (en) |
| IE (1) | IE36641B1 (en) |
| NL (1) | NL180290C (en) |
| NO (1) | NO137428C (en) |
| SE (1) | SE422175B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5350772Y2 (en) * | 1975-01-23 | 1978-12-05 | ||
| JPS5412057Y2 (en) * | 1977-11-11 | 1979-05-29 | ||
| CH641400A5 (en) * | 1979-07-26 | 1984-02-29 | Tetra Pak Dev | METHOD FOR PRODUCING A STRETCHED PLASTIC FILM WITH BIAXIAL MOLECULE ORIENTATION. |
| JPS59102249U (en) * | 1982-12-24 | 1984-07-10 | 株式会社アーレスティ | Core extraction device in die casting casting |
| JPS62249721A (en) * | 1986-04-23 | 1987-10-30 | Mazda Motor Corp | Apparatus for producing arc-shaped hollow plastics component |
| JP2617358B2 (en) * | 1989-09-22 | 1997-06-04 | 松下電工株式会社 | How to remove molded products |
| CN102741037B (en) * | 2010-02-10 | 2014-10-29 | 住友电工超效能高分子股份有限公司 | Heat shrinkable tube, and production method and production device thereof |
| WO2011104987A1 (en) | 2010-02-26 | 2011-09-01 | 住友電工ファインポリマー株式会社 | Fluororesin tube and rotating body for fixing device |
| JP5407046B2 (en) * | 2010-03-08 | 2014-02-05 | 住友電工ファインポリマー株式会社 | Heat-shrinkable resin tube and rotating body for image forming apparatus |
| CN112584921A (en) * | 2018-08-30 | 2021-03-30 | 京瓷株式会社 | Rotating member, member for kneading machine, kneading machine using the member, bearing, and bearing unit using the bearing |
| CN110039758B (en) * | 2019-05-23 | 2023-12-26 | 江苏鼎尚电子材料股份有限公司 | Air supplementing mechanism for heat shrinkage tube production |
| CN113715313B (en) * | 2021-09-27 | 2023-12-01 | 哈尔滨鹏程新材料科技股份有限公司 | Co-extrusion film blowing machine for producing food packaging composite bags |
| CN114905715B (en) * | 2022-02-11 | 2023-04-18 | 宿迁市金田塑业有限公司 | Preparation process and production equipment of biaxially oriented polypropylene dual-heat green protection film |
| CN117163277B (en) * | 2022-05-25 | 2024-11-05 | 广东汇天航空航天科技有限公司 | Flight equipment control method, flight equipment, control device and storage medium |
| CN119217700B (en) * | 2024-12-03 | 2025-02-25 | 成都顶新包装有限公司 | Blow molding equipment for PE film production and processing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3466356A (en) * | 1966-10-27 | 1969-09-09 | Celanese Corp | Method and apparatus for making plastic film |
-
1971
- 1971-08-31 DK DK426371AA patent/DK125973B/en not_active IP Right Cessation
-
1972
- 1972-07-27 GB GB3519672A patent/GB1390430A/en not_active Expired
- 1972-08-01 CA CA148,441A patent/CA975516A/en not_active Expired
- 1972-08-17 IE IE1144/72A patent/IE36641B1/en unknown
- 1972-08-19 DE DE2240903A patent/DE2240903C2/en not_active Expired
- 1972-08-28 FR FR7230563A patent/FR2150917B1/fr not_active Expired
- 1972-08-28 FI FI2372/72A patent/FI55142C/en active
- 1972-08-30 NO NO3068/72A patent/NO137428C/en unknown
- 1972-08-30 JP JP47086402A patent/JPS4834969A/ja active Pending
- 1972-08-30 BE BE788153A patent/BE788153A/en not_active IP Right Cessation
- 1972-08-31 NL NLAANVRAGE7211856,A patent/NL180290C/en not_active IP Right Cessation
-
1980
- 1980-08-18 JP JP1980116103U patent/JPS5839877Y2/en not_active Expired
-
1981
- 1981-08-31 SE SE8105125A patent/SE422175B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| IE36641B1 (en) | 1977-01-19 |
| JPS5839877Y2 (en) | 1983-09-08 |
| FR2150917A1 (en) | 1973-04-13 |
| DE2240903C2 (en) | 1983-10-27 |
| JPS4834969A (en) | 1973-05-23 |
| SE422175B (en) | 1982-02-22 |
| SE8105125L (en) | 1981-08-31 |
| DE2240903A1 (en) | 1973-05-10 |
| GB1390430A (en) | 1975-04-09 |
| NL7211856A (en) | 1973-03-02 |
| BE788153A (en) | 1972-12-18 |
| FR2150917B1 (en) | 1976-09-17 |
| CA975516A (en) | 1975-10-07 |
| NL180290C (en) | 1987-02-02 |
| FI55142B (en) | 1979-02-28 |
| NL180290B (en) | 1986-09-01 |
| JPS5655623U (en) | 1981-05-14 |
| IE36641L (en) | 1973-02-28 |
| FI55142C (en) | 1979-06-11 |
| NO137428C (en) | 1978-03-01 |
| DK125973B (en) | 1973-05-28 |
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