DK162972B - PROCEDURE FOR MANUFACTURING PLASTIC HOLIDAYS AT Blown-UP AND APPLIANCES FOR USE IN EXERCISING THE PROCEDURE - Google Patents
PROCEDURE FOR MANUFACTURING PLASTIC HOLIDAYS AT Blown-UP AND APPLIANCES FOR USE IN EXERCISING THE PROCEDURE Download PDFInfo
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- DK162972B DK162972B DK393084A DK393084A DK162972B DK 162972 B DK162972 B DK 162972B DK 393084 A DK393084 A DK 393084A DK 393084 A DK393084 A DK 393084A DK 162972 B DK162972 B DK 162972B
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- DK
- Denmark
- Prior art keywords
- mold
- cavity
- air
- blowing
- inflated
- Prior art date
Links
- 239000004033 plastic Substances 0.000 title claims description 19
- 229920003023 plastic Polymers 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title description 3
- 239000000463 material Substances 0.000 claims description 25
- 238000007664 blowing Methods 0.000 claims description 19
- 238000001125 extrusion Methods 0.000 claims description 19
- 238000000071 blow moulding Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/0042—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor without using a mould
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
- B29C49/04108—Extrusion blow-moulding extruding several parisons parallel to each other at the same time
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
- B29C49/0411—Means for defining the wall or layer thickness
- B29C49/04114—Means for defining the wall or layer thickness for keeping constant thickness
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/04—Extrusion blow-moulding
-
- 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
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/08—Biaxial stretching during blow-moulding
- B29C49/16—Biaxial stretching during blow-moulding using pressure difference for pre-stretching, e.g. pre-blowing
- B29C49/1602—Biaxial stretching during blow-moulding using pressure difference for pre-stretching, e.g. pre-blowing pre-blowing without using a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7158—Bottles
Description
iin
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Den foreliggende opfindelse angår en fremgangsmåde til fremstilling af plasthullegemer ved blæsestøbning, hvorunder et rørformet legeme opblæses med luft tilført gennem en ekstru-deringsdyse inden en form lukkes om legemet, som derefter op-5 blæses til berøring med formhulrummets vægge.The present invention relates to a method for making plastic cavities by blow molding, wherein a tubular body is inflated with air supplied through an extrusion nozzle before a mold is closed about the body, which is then inflated to contact the walls of the mold cavity.
Fra US-patentskrift nr. 3.579.622 kendes en fremgangsmåde af denne art, hvor det rørformede legeme blæses delvis op under radial udvidelse til en pærelignende facon, hvorefter formhul-10 rummet lukkes om legemet under lokal berøring mellem legemet og formhulrummets kraftigt afkølende vægge. Derefter blæses legemet op til fuldt anlæg med formhulrummets vægge.US Patent No. 3,579,622 discloses a method of this kind in which the tubular body is partially inflated during radial expansion to a bulb-like shape, after which the mold cavity is closed about the body under local contact between the body and the vigorously cooling walls of the mold cavity. Then the body is inflated to full abutment with the walls of the mold cavity.
Kendte enheder indbefatter således et eller flere ekstrude-15 ringsmundstykker eller -dyser til at ekstrudere plastmaterialet og er forbundet til organer til at føde plastif iceret plastmateriale, f.eks. en Archimedes skrue, hvilket sikrer, at plastmaterialet plastificeres i en muffe og dets fremføring til et ekstruderingshoved, og organer til at blæse atmosfærisk 20 luft ind i det dannede rørformede legeme eller post ved dysens udløb, organer til at afskære posten og svejse postens basis, en form til at modtage posten og med et indre hulrum svarende til den ønskede form for det hule legeme, der skal formes, mindst et blæserør til at blæse atmosfærisk luft ind i formen, 25 et apparat til at forskyde formen fra ekstruder ingsdysen til blæserøret og omvendt for den efterfølgende post, og organer til at udstøde færdige hule legemer og affald.Known units thus include one or more extrusion nozzles or nozzles for extruding the plastic material and are connected to means for feeding plasticized plastic material, e.g. an Archimedes screw, which ensures that the plastic material is plasticized in a sleeve and its feed to an extrusion head, and means for blowing atmospheric air into the formed tubular body or post at the outlet of the nozzle, means for cutting the post and welding the base of the post, a mold for receiving the mail and having an inner cavity corresponding to the desired shape of the hollow body to be formed, at least one blower for blowing atmospheric air into the mold, an apparatus for displacing the mold from the extrusion nozzle to the blower, and vice versa for the subsequent post, and bodies for ejecting finished hollow bodies and debris.
Postens tykkelse ved ekstruderingsdysens udløb er tilpasset i 30 lodret retning således, at der opnås en god materialefordeling i postens bevægelsesretning, dvs. imellem det hule legemes basis og øvre ende. Nuværende teknik indbefatter også blæsning af atmosfærisk luft ved forholdsvis lavt tryk, f.eks. ved 0,3 bar, ind i den post, der i forvejen er svejset ved basen, for 35 således at opnå en slags plastmaterialebobbel, hvis længde er meget mindre end for det ønskede hule legeme, derpå lukke formens to parter om posten, og blæse atmosfærisk luft ved højtThe thickness of the post at the outlet of the extrusion die is adjusted in the vertical direction so that a good distribution of material is obtained in the direction of movement of the post, ie. between the base and upper end of the hollow body. Current technique also includes blowing atmospheric air at relatively low pressure, e.g. at 0.3 bar, into the post already welded at the base, so as to obtain a kind of plastic material bubble whose length is much smaller than that of the desired hollow body, then close the two parts of the mold about the post, and blow atmospheric air at high
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2 tryk (størrelsesorden på 6 eller 7 bar) ind i den i formen fangede post, for således at puste posten op og føre den til jævnt anlæg mod formens hulrum.2 presses (on the order of 6 or 7 bar) into the post trapped in the mold, so as to inflate the post and bring it evenly against the mold cavity.
5 Man har nu fundet, at materialefordelingen i vandret retning, med henseende til successive vandrette lag af den slutteligt dannede flaske, ikke er jævn. Gennemførte målinger har i realiteten vist tynde områder og overdrevne tykke områder. Det har f.eks. i forbindelse med 5 liter flasker til hushold-10 nings-, vedligeholdelses- eller vaskeprodukter vist sig, at de svage områder er de, hvor tykkelsen er mindre end 0,70 mm, og som er anbragt ved den fremadvendende buede part ved flaskens bund og på halsens skulder og på håndtaget.It has now been found that the material distribution in the horizontal direction, with respect to successive horizontal layers of the finally formed bottle, is not uniform. Measurements taken have in fact shown thin areas and excessively thick areas. It has e.g. in connection with 5 liter bottles for household, maintenance or washing products, the weak areas are those where the thickness is less than 0.70 mm and which is placed at the forward curved part at the bottom of the bottle and on the shoulder of the neck and on the handle.
15 De overdrevne tykke områder, f.eks. områder med en tykkelse, der overstiger 1,20 mm, er placeret i svejseområderne ved flaskens basis og ved sidernes basis.The excessively thick areas, e.g. areas with a thickness exceeding 1.20 mm are placed in the welding areas at the base of the bottle and at the base of the sides.
Disse tykkelsesvarianter ved successive vandrette flaskesek-20 tioner har følgende mangler:These thickness variants in successive horizontal bottle sections have the following shortcomings:
Under beholderfyldningen og igen under flaskernes lagring og fyldning trykker beholderne i deres svage områder mere eller mindre ind i hinanden; desuden udgør eksistensen af disse om-25 råder en risiko for lokalt brud og deraf følgende lækager ved håndteringen; endeligt møder man vanskeligheder til på passende måde . at fastgøre flaskens etiket på den til dette formål tilvejebragte side, hvilket skyldes, at denne side ikke er plan.During the container filling and again during the storage and filling of the bottles, the containers in their weak areas press more or less into each other; moreover, the existence of these areas poses a risk of local rupture and consequent leaks in handling; finally, difficulties are encountered appropriately. affixing the label of the bottle to the side provided for this purpose, which is because this side is not planar.
3030
Denne skadelige uregelmæssighed i materialefordelingen inden for et givet vandret beholderlag eller -sektion, kan forklares ved den kendsgerning, at når man begynder at blæse posten i formen forekommer kontakten mellem det varme plastmateriale og 35 formens kølede vægge (ved ca. 20°C) ikke samtidigt ved ethvert punkt af formen. Imidlertid bevirker kontakten mellem det varme plastmateriale og formhulrummets væg umiddelbart, at plast-This deleterious irregularity in the material distribution within a given horizontal container layer or section can be explained by the fact that when one begins to blow the post in the mold, contact between the hot plastic material and the cooled walls of the mold (at about 20 ° C) does not occur. simultaneously at any point of the form. However, the contact between the hot plastic material and the mold cavity wall immediately causes the plastic
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3 materialet begynder at størkne frem for alt på postens ydre væg, der følgelig bliver vanskeligere at bearbejde. I praksis viser analysen af postblæsningen, at plastmaterialet først kommer i berøring med bunden, den udbulende forpart foran 5 håndtaget og halsen, efter blæsningens begyndelse. Det allerede kølede materiale skal derfor trækkes i betragtelig grad for at nå de fjerne punkter, hvilket forklarer deres mindre tykkelse. Ved det øjeblik, hvor formen lukkes, er det endvidere siderne, der hurtigst kommer i kontakt med formen. Plastmate-10 rialet hærdes så som følge deraf, og bevæger sig derefter med større vanskelighed og dette frembringer de iagttagne overdrevne tykkelser.3 the material begins to solidify above all on the outer wall of the post, which consequently becomes more difficult to process. In practice, the analysis of the post-blowing shows that the plastic material first comes into contact with the bottom, the bulging front part of the handle and the neck, after the beginning of the blowing. Therefore, the already cooled material must be drawn to a considerable extent to reach the distant points, which explains their smaller thickness. Furthermore, at the moment the mold is closed, the pages that come into contact with the mold are the fastest. The plastic material is then hardened as a result, and then moves with greater difficulty and this produces the observed excessive thicknesses.
Formålet med opfindelsen er at overvinde dette problem og 15 sikre en jævn fordeling af plastmaterialet i en given vandret flaskesektion eller -niveau i løbet af blæsningen.The object of the invention is to overcome this problem and to ensure an even distribution of the plastic material in a given horizontal bottle section or level during the blowing.
Dette opnås ved fremgangsmåden ifølge den foreliggende opfindelse, som er ejendommelig ved, at det rørformede legeme både 20 opblæses aksialt og radialt til en længde henholdsvis bredde i hovedsagen svarende til hul legemets endelige form og derefter tømmes for luft og relakserer inden formhulrummet lukkes om legemet og den endelige opblæsning til berøring med formhulrummets vægge finder sted.This is achieved by the method of the present invention, which is characterized in that the tubular body is inflated both axially and radially to a length or width respectively corresponding to the final shape of the hollow body and then emptied of air and relaxes before the mold cavity is closed about the body and the final blow-up for contact with the mold cavity walls takes place.
2525
Herved opnås således, at der kan fremstilles blæsestøbte plastemner med en mere ensartet vægtykkelse end det hidtil har været muligt. Dette gælder især for emner som ikke har cirkulære tværsnit og generelt har kompliceret form.This is achieved so that blow molded plastic blanks with a more uniform wall thickness can be made than has hitherto been possible. This is especially true for items that do not have circular cross sections and generally have complicated shape.
3030
De overdrevne tykkelser og de svage områder er forsvundet, takket være, at man undgår en for tidlig lokal berøring mellem plastmaterialet og formhulrummets store hurtigtafkølende sider .The excessive thicknesses and the weak areas have disappeared, thanks to avoiding premature local contact between the plastic material and the large, rapidly cooling sides of the mold cavity.
Det ved den forudgående oppustning strakte eller trukne rørformede legeme andrager således efter lufttømning en slap 35Thus, the tubular body stretched or drawn in the prior inflection, after air discharge, amounts to a slack 35
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4 form, der gør det muligt at anbringe dette i formens indre, uden at legemet kommer i utidig berøring med formhulrummets afkølende vægge. Ved den efterfølgende blæsning af legemet ved et højt tryk sikres, at dette samtidigt og ensartet lægges 5 eller trykkes an imod formhulrummet.4, which allows it to be placed in the interior of the mold without contacting the body with the cooling walls of the mold cavity. The subsequent blowing of the body at high pressure ensures that this is applied simultaneously and uniformly or pressed against the mold cavity.
Opfindelsen angår endvidere også et apparat til brug ved udøvelse af fremgangsmåden og som indbefatter i det mindste en ekstruderingsdyse til at ekstrudere plastmateriale og forbun-10 det med midler til at tilføre plastificeret materiale, midler til at afskære hullegemet og svejse legemets basis, midler til at blæse atmosfærisk luft ind i det ved ekstruderingsdysens munding dannede hul legeme, en form til at modtage legemet og har et indre hulrum, der svarer til den ønskede form af det 15 hule legeme, der skal formes, midst et rør til at blæse atmosfærisk luft ind i formen, en indretning til at forskyde formen fra ekstruderingsdysen til blæserøret og omvendt, og organer til at udstøde de færdige hullegemer og affald 20 Apparatet er ejendommeligt ved, at der er tilvejebragt en føl— ste elektroventi1, der hører til organet til at blæse luft ind i det dertil hørende ekstrusionshovede og styres af en anden elektroventi! for at sætte det tilsvarende hul legeme i forbindelse med atmosfæren efter oppustning, og for derefter at af-25 bryde forbindelsen til atmosfæren efter et forudbestemt tidsrum og således tillade oppustning af det efterfølgende hulle-geme.The invention further relates to an apparatus for use in the method, which includes at least one extrusion nozzle for extruding plastic material and connected with means for supplying plasticized material, means for cutting the hollow body and welding the base of the body, means for blowing atmospheric air into the hollow body formed at the mouth of the extruder nozzle, a form for receiving the body and having an inner cavity corresponding to the desired shape of the hollow body to be formed, in the middle of a tube for blowing in atmospheric air. in the mold, a device for displacing the mold from the extrusion nozzle to the blower and vice versa, and means for ejecting the finished hollow bodies and debris 20 The apparatus is peculiar in that a sensitive electrode valve 1 belonging to the means for blowing air is provided. into the associated extrusion head and controlled by another electrovent! to connect the corresponding hollow body to the atmosphere after inflation, and then to disconnect the connection to the atmosphere after a predetermined period of time, thus allowing inflation of the subsequent cavity.
Yderligere karakteristika og fordele ved opfindelsens genstand 30 vil fremgå af den efterfølgende beskrivelse under henvisning til tegningen, der illustrerer en måde til udøvelse af opfindelsen.Further characteristics and advantages of the object 30 of the invention will become apparent from the following description with reference to the accompanying drawings which illustrate a way of practicing the invention.
På tegningen viser 35 fig. 1 set forfra og forenklet en blæsestøbeenhed til fremstilling af piasthullegemer ved fremgangsmåden ifølge opfindelsen.In the drawing, FIG. 1 is a front view and simplified a blow molding unit for the production of plaster cavities by the method according to the invention.
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5 fig. 2 et forenklet sidebillede af den i fig. 1 viste enhed, fig. 3 skematisk efter hinanden følgende trin for fremgangsmåden til fremstilling af et hullegeme ifølge opfindelsen ved 5 hjælp af den i fig. 1 og 2 viste enhed, og fig. 4 skematisk en udførelsesform for et apparat til at styre indblæsningen af atmosfærisk luft i posten ved ekstruder ings-hovedets udløbsende, hvilken post er uden for formen.5 FIG. 2 is a simplified side view of the embodiment of FIG. 1; FIG. 3 is a schematic view of successive steps of the method of making a hollow body according to the invention by means of the embodiment shown in FIG. 1 and 2, and FIG. 4 schematically shows an embodiment of an apparatus for controlling the supply of atmospheric air in the entry at the outlet end of the extrusion head, which entry is outside the mold.
1010
Den i fig. 1 og 2 viste enhed er tilpasset til at fremstille et hullegeme ved blæsestøbning af plastmateriale og især beholdere med en kompleks form, såsom polyethylenflasker med forskellig rumfang, tilpasset til at indeholde f.eks. vedlige-15 holdelses-, rengørings- eller vaskeprodukter.The FIG. 1 and 2 are adapted to produce a hollow body by blow molding of plastic material and especially containers of a complex shape, such as polyethylene bottles of different volumes, adapted to contain e.g. maintenance-cleaning, cleaning or washing products.
På kendt måde indbefatter enheden en ekstruder 1, der er styret med en vandret skrue til at plastificere det materiale, der indføres i ekstruderen gennem en tragt 2, to ekstrude-20 ringsdyser 3 anbragt lodret og fødet med plastificeret materiale ved hjælp af ekstruderen 1, organer 4 til at blæse atmosfærisk luft ind i poster 5, der dannes ved dyserne 3's udløbsende, organer 15 til at afskære efter hinanden følgende poster, en hovedform 6 dannt af to halvforme 6a, hvori der er 25 afgrænset to halvhulrum 7 svarende til formen for det hule legeme, der skal formes, to rør 8 til at blæse atmosfærisk luft ind i formen 6, et ikke vist apparat til at forskyde hovedformen 6 fra dyserne 3 til blæserørene 8 ind under sidstnævnte og omvendt og ikke viste organer til at udstøde de færdige hule 30 legemer 9 og affald. Affaldet optages på en transportør 11 og føres på kendt måde tilbage til ekstruderen 1.In known manner, the unit includes an extruder 1 controlled by a horizontal screw to plasticize the material introduced into the extruder through a hopper 2, two extruder nozzles 3 arranged vertically and fed with plasticized material by the extruder 1, means 4 for blowing atmospheric air into posts 5 formed at the outlet end of nozzles 3, means 15 for cutting successive posts, a main mold 6 formed by two semi-molds 6a, in which there are defined two semi-cavities 7 corresponding to the mold of the hollow body to be formed, two tubes 8 for blowing atmospheric air into the mold 6, an apparatus not shown for displacing the main mold 6 from the nozzles 3 for the blower pipes 8 under the latter, and vice versa, and not shown means for ejecting the finished hollow 30 bodies 9 and waste. The waste is picked up on a conveyor 11 and returned in known manner to the extruder 1.
Alle de ovenfor nævnte parter hviler på en fast ramme 12. Enheden omfatter også en form 13 til at modtage de i formen 6 35 dannede beholdere 9a, et stempel 14 hørende til hvert ekstru-deringshoved til at forskyde dykstemplet, der på kendt måde er anbragt i dette hoved for derved at indstille tykkelsen af po-All of the above-mentioned parts rest on a fixed frame 12. The unit also comprises a mold 13 for receiving the containers 9a formed in the mold 6, a piston 14 associated with each extrusion head for displacing the plunger piston disposed in known manner. in this head, thereby adjusting the thickness of the
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6 sten 5's væg, og to stempler 16, 17 hørende til blæserørene 8. Stemplet 16 er pneumatisk og stemplet 17 hydraulisk. Enheden er udstyret med en motor 18 forbundet med en hastighedsnedsætter 19 til at dreje ekstruderen l's skrue og elektroniske pro-5 grammeringsorganer og stempler (ikke vist) til at forskyde de to halvforme 6a, med det formål at forskyde dem væk fra hinanden eller henimod hinanden til formens lukning, og til at forskyde den om posterne lukkede form 6 mellem ekstruderingshove-derne 3 og blæserørene 8.6 wall 5 of stone 5, and two pistons 16, 17 associated with blower pipes 8. Piston 16 is pneumatic and piston 17 hydraulic. The unit is equipped with a motor 18 connected to a speed reducer 19 for rotating the screw of extruder 1 and electronic programming means and pistons (not shown) to displace the two half-molds 6a, for the purpose of displacing them away from each other or towards each other. for the mold closure, and to displace the mold 6 closed mold between the extrusion heads 3 and the blower tubes 8.
1010
Ifølge opfindelsen indbefatter enheden (fig. 4) to elektroventiler, der hver hører til 1 uftindblæsningsorganet til at blæse atmosfærisk luft ind i dyserne 3 og automatisk styret af en elektroventi 1 23, der selv styres elektrisk ved hjælp af pro-15 grammerbare tidsindstiIlede relæer. Elektroventilerne 21, 22 styrer hver i overensstemmelse med deres placering gennemstrømning af atmosfærisk luft til oppustning af den tilhørende post 5 via det tilhørende ekstruderingshoved 3's stempel 24, 25 via aksiale gennemstrømningsåbninger 26, 27, der skematisk 20 ses i fig. 4.According to the invention, the unit (Fig. 4) includes two electro valves, each belonging to the 1 air supply means for blowing atmospheric air into the nozzles 3 and automatically controlled by an electro-valve 1 23, which is itself electrically controlled by programmable time-adjusted relays. The electro valves 21, 22 each control according to their location the flow of atmospheric air to inflate the associated post 5 via the piston 24, 25 of the associated extrusion head 3 via axial flow openings 26, 27, schematically seen in FIG. 4th
Ved fremgangsmåden ifølge opfindelsen, hvis trin er illustreret i fig. 3, og som udøves ved hjæp af apparatet, der styrer blæsning af atmosfærisk luft ind i posterne gennem ekstrude-25 ringshovederne 3 ved hjælp af elektroventilsystemet 21, 22, 23, beskrives først styreapparatets operation.In the method of the invention, the steps of which are illustrated in FIG. 3, and which is exerted by means of the apparatus which controls the blowing of atmospheric air into the posts through the extrusion heads 3 by means of the electro-valve system 21, 22, 23, first describes the operation of the control apparatus.
I den i fuld streg viste stilling for elektroventilerne 21-23 er elektroventilen 23's (der består af to tidsindstillede, 30 ikke viste relæer) elektriske regulering V, der tillader programmering af start og stop for forbindelsen med atmosfæren, i hvile og returorganet Y holder derfor elektroventilen 23 i stilling til at forhindre trykket Pj (angivet ved pil med fuld streg ) i at passere. Trykket ?2 udøvet på elektroventilerne 35 21's og 22*s trykknapper (ikke vist) holder sidstnævnte i stilling for direkte passage af det oppustende lufttryk P ind i posterne gennem de aksiale gennemstrømningsåbninger 26, 27 og stemplerne 24, 25.In the full line position of the electro valves 21-23, the electro valve 23's (consisting of two timed, 30 relays not shown) is electrical control V, which allows programming of the start and stop of connection with the atmosphere, at rest and the return means Y therefore holds the electro valve 23 in position to prevent the pressure Pj (indicated by arrow with full stroke) from passing. The pressure? 2 exerted on the push buttons of the electro valves 35 21 and 22 * (not shown) holds the latter in position for direct passage of the inflating air pressure P into the posts through the axial flow openings 26, 27 and the pistons 24, 25.
DK 162972BDK 162972B
7 I elektroventilerne 21-23's anden stilling, der er illustreret ved punktstreg-pilene, sættes posterne i forbindelse med atmosfæren på følgende måde: Den elektriske regulering Y sættes under spænding således, at atmosfærisk luft ved trykket Pj 5 strømmer igennem elektroventilen 23 og aktiverer elektroventi -lerne 21, 22, der så igen forskydes til den stilling, hvor posterne tømmes for luft. Pilene P angiver, at tilførslen af oppustningsluft til gennemstrømningsåbningerne 26, 27 er af brudt .7 In the second position of the electro-valves 21-23, illustrated by the dash arrows, the entries are connected to the atmosphere as follows: The electrical control Y is energized such that atmospheric air at the pressure Pj 5 flows through the electro-valve 23 and activates the electro-valve. -s 21, 22, which in turn is shifted to the position where the items are emptied of air. The arrows P indicate that the supply of inflation air to the flow openings 26, 27 is broken.
10 Når nye poster skal pustes op, sætter apparatets automatiske programmering ved hjælp af de ovennævnte relæer reguleringen Y i hvileposition og den ovennævnte cyklus begynder igen.10 When new items need to be inflated, the automatic programming of the apparatus puts the control Y in the rest position and the above cycle begins again with the help of the above relays.
15 Under henvisning til fig. 3 beskrives en udførelsesform for den fremgangsmåde, som den foreliggende opfindelse angår.15 Referring to FIG. 3 describes an embodiment of the method to which the present invention relates.
De to halvforme 6a er anbragt adskilte fra hinanden og plastmaterialet strømmer ud fra ekstruderingshovedet 3, idet at-20 mosfærisk luft blæses ind i posten 28, hvilket er automatisk reguleret ved hjælp af den til hovedet 3 hørende elektroven-til 21 (eller 22) og som selv er aktiveret af elektroventilen 22, jævnfør ovenfor.The two semi-molds 6a are spaced apart and the plastic material flows out of the extrusion head 3, with atmospheric air being blown into the entry 28 which is automatically controlled by the electrode of 21 (or 22) associated with the head 3 and which is itself actuated by the electro-valve 22, see above.
25 Luft blæses ind i posten 28 og sidstnævnte pustes gradvis op, idet lufttrykket er f.eks. ca. 0,6 bar. Begyndelsen af dette trin er illustreret i billedet a.Air is blown into the entry 28 and the latter is gradually inflated, the air pressure being e.g. ca. 0.6 bar. The beginning of this step is illustrated in image a.
Blæsning ved dette tryk fortsættes indtil posten 29 i det væ-30 sentlige er så lang som den færdige beholder 9 og har et tvær snit, der er lig med hulrummet 7's, når formen er lukket. Dette trin er angivet i billedet b, og indblæsningen af atmosfærisk luft afbrydes ved elektroventilen 23's virkning, når posten har indtaget den form, der er angivet ved henvisningstal-35 let 29 i trin b.Blowing at this pressure is continued until the post 29 is substantially as long as the finished container 9 and has a cross-section equal to the cavity 7's when the mold is closed. This step is indicated in the image b and the supply of atmospheric air is interrupted by the action of the electro-valve 23 when the record has taken the form indicated by the reference numeral 29 in step b.
I løbet af dette trin er plastmaterialet derfor blevet jævnt fordelt i hver af posten 29's vandrette snit eller sektioner,During this step, therefore, the plastic material has been evenly distributed in each of the horizontal sections or sections of the item 29,
DK 162972 BDK 162972 B
8 og dens tykkelse er følgelig konstant inden for en given sektion.8 and its thickness is consequently constant within a given section.
Derefter afbrydes indblæsningen af atmosfærisk luft (trin c) 5 for at tømme posten for luft, hvorved den antager den slappe tilstand vist ved henvisningstallet 31, ved at den sættes i forbindelse med atmosfæren eller et lavere tryk. Som nævnt ovenfor afbrydes indblæsningen af atmosfærisk luft ved at slutte strømmen til elektroventilen 23's elektriske regulering 10 Y.Thereafter, the inlet of atmospheric air (step c) 5 is interrupted to empty the entry of air, thereby assuming the relaxed state shown by reference numeral 31 by being associated with the atmosphere or at a lower pressure. As mentioned above, the supply of atmospheric air is interrupted by connecting the current to the electrical control 10 Y.
Derpå lukkes formen om den for luft tømte post 31 (trin d), hvis vægge følgelig holdes ude af berøring med hulrummet 7's kolde vægge. Formen 6 (der er i den i fig. 1 illustrerede ud-15 førelsesform kan forme to beholdere 9a) forskydes så for at placere den under luftindblæsningsrørene 8. Atmosfærisk luft under højt tryk, f.eks. i en størrelsesorden på 7 bar, blæses gennem rørene 8 som angivet ved pilene i diagram d således, at posten 9a's vægge, der er fanget inden i formen 6, samtidigt 20 ved hvert punkt trykkes eller lægges imod hulrummet 6.Then the mold is closed around the air emptied post 31 (step d), the walls of which are consequently kept out of contact with the cold walls of the cavity 7. The mold 6 (which in the embodiment illustrated in Fig. 1 can form two containers 9a) is then displaced to place it under the air supply pipes 8. Atmospheric air under high pressure, e.g. in the order of 7 bar, is blown through the pipes 8 as indicated by the arrows in diagram d such that the walls 9a trapped within the mold 6 are simultaneously pressed or laid against the cavity 6 at each point.
Den mellem posten 31 og hulrummet 7 fangne atmosfæriske luft er jævnt fordelt og udgør en skærm, der elimineres ved ind-blæsningen ved hjælp af gennemstrømningsåbninger (ikke vist), 25 der til dette formål på i og for sig kendt måde er tilveje bragt mellem de to halvforme 6a.The atmospheric air trapped between the entry 31 and the cavity 7 is evenly distributed and constitutes a screen eliminated by the inlet by flow openings (not shown) 25 provided for this purpose in a manner known per se. two semi-molds 6a.
Under blæsningen lægges materialet følgeligt hurtigt og ensartet mod hele hulrummets overflade indbefattende de punkter, 30 der ligger længst fra posten 9a's akse, da den nødvendige ekspansion allerede stort set er blevet opnået uden for formen 6.Accordingly, during blowing, the material is laid quickly and uniformly against the entire cavity surface, including the points 30 furthest from the axis 9a axis, since the necessary expansion has already been largely achieved outside the mold 6.
Efter at indblæsningen af atmosfærisk luft er blevet afbrudt, åbnes formen 6 for at udtage de formede beholdere 9a, fjerne 35 knaster og finner på kendt måde, og støde de færdige beholdere 9 ud.After the supply of atmospheric air has been interrupted, the mold 6 is opened to take out the shaped containers 9a, remove 35 knobs and fins in known manner, and eject the finished containers 9.
Claims (4)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8313551A FR2550990B1 (en) | 1983-08-22 | 1983-08-22 | METHOD FOR MANUFACTURING A HOLLOW BODY BY EXTRUSION AND BLOWING OF PLASTIC MATERIAL AND INSTALLATION FOR CARRYING OUT SAID METHOD |
| FR8313551 | 1983-08-22 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| DK393084D0 DK393084D0 (en) | 1984-08-16 |
| DK393084A DK393084A (en) | 1985-02-23 |
| DK162972B true DK162972B (en) | 1992-01-06 |
| DK162972C DK162972C (en) | 1992-06-15 |
Family
ID=9291741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK393084A DK162972C (en) | 1983-08-22 | 1984-08-16 | PROCEDURE FOR MANUFACTURING PLASTIC HOLIDAYS AT Blown-UP AND APPLIANCES FOR USE IN EXERCISING THE PROCEDURE |
Country Status (15)
| Country | Link |
|---|---|
| JP (1) | JPS6064824A (en) |
| AU (1) | AU571887B2 (en) |
| BE (1) | BE900399A (en) |
| BR (1) | BR8404135A (en) |
| CA (1) | CA1231212A (en) |
| CH (1) | CH664327A5 (en) |
| DE (1) | DE3429141C2 (en) |
| DK (1) | DK162972C (en) |
| ES (2) | ES8504543A1 (en) |
| FR (1) | FR2550990B1 (en) |
| GB (2) | GB2145365B (en) |
| GR (1) | GR80140B (en) |
| IL (1) | IL72893A (en) |
| IT (1) | IT1179219B (en) |
| ZA (1) | ZA846390B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5352402A (en) * | 1989-10-23 | 1994-10-04 | Nissei Asb Machine Co., Ltd. | Method and apparatus for manufacturing biaxially oriented, thermally stable, blown containers |
| JPH0740955A (en) * | 1993-07-28 | 1995-02-10 | Toyo Seikan Kaisha Ltd | Manufacture of biaxially oriented plastic bottle with excellent heat resistance and device therefor |
| US5474735A (en) * | 1993-09-24 | 1995-12-12 | Continental Pet Technologies, Inc. | Pulse blow method for forming container with enhanced thermal stability |
| DE19545024B4 (en) | 1995-12-02 | 2005-02-17 | Sig Corpoplast Gmbh & Co. Kg | Process for the production of containers |
| EP1470427B1 (en) | 2002-01-25 | 2007-11-07 | Innovadyne Technologies, Inc. | Low volume, non-contact liquid dispensing method |
| US20110248429A1 (en) * | 2008-12-17 | 2011-10-13 | Toyo Seikan Kaisha, Ltd. | Method for producing synthetic resin container |
| EP2691226B1 (en) | 2011-03-29 | 2018-07-18 | Amcor Group GmbH | Method of forming a container |
| CN102896764B (en) * | 2012-08-08 | 2015-03-18 | 亚普汽车部件股份有限公司 | Method for forming hollow box body provided with built-in component |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2260750A (en) * | 1938-07-08 | 1941-10-28 | Plax Corp | Method of and machine for making hollow articles from plastics |
| FR1450395A (en) * | 1963-11-21 | 1966-06-24 | Method and device for the manufacture of plastic containers | |
| US3425090A (en) * | 1966-04-04 | 1969-02-04 | Phillips Petroleum Co | Parison prepinching and preblowing apparatus |
| US3579622A (en) * | 1966-10-17 | 1971-05-18 | Monsanto Co | Method for blow molding plastic articles |
| FR2264646B1 (en) * | 1974-03-22 | 1978-06-16 | Remy & Cie E P | |
| JPS5451684A (en) * | 1977-09-30 | 1979-04-23 | Toppan Printing Co Ltd | Container and making method thereof |
| SE429317B (en) * | 1980-05-29 | 1983-08-29 | Plm Ab | SETTING ASTADCOMMENDING ANY POLYETHYLTENE PREPARATE OR ITS LIKE THERMOPLASTIC MATERIAL AS A DEVICE FOR THIS |
| US4356142A (en) * | 1980-08-27 | 1982-10-26 | Wheaton Industries | Injection blow molding pet products |
| CA1220911A (en) * | 1982-07-27 | 1987-04-28 | Katashi Aoki | Method for the temperature control of parison in injection stretching blow molding method |
| JPS59179318A (en) * | 1983-03-31 | 1984-10-11 | Katashi Aoki | Biaxial orientation blow molding method of polypropylene |
-
1983
- 1983-08-22 FR FR8313551A patent/FR2550990B1/en not_active Expired
-
1984
- 1984-08-08 DE DE3429141A patent/DE3429141C2/en not_active Revoked
- 1984-08-16 DK DK393084A patent/DK162972C/en not_active IP Right Cessation
- 1984-08-16 ZA ZA846390A patent/ZA846390B/en unknown
- 1984-08-17 IT IT48734/84A patent/IT1179219B/en active
- 1984-08-20 BR BR8404135A patent/BR8404135A/en not_active IP Right Cessation
- 1984-08-20 GR GR80140A patent/GR80140B/en unknown
- 1984-08-20 CH CH4002/84A patent/CH664327A5/en not_active IP Right Cessation
- 1984-08-21 GB GB08421174A patent/GB2145365B/en not_active Expired
- 1984-08-21 AU AU32209/84A patent/AU571887B2/en not_active Ceased
- 1984-08-21 CA CA000461417A patent/CA1231212A/en not_active Expired
- 1984-08-21 BE BE0/213523A patent/BE900399A/en not_active IP Right Cessation
- 1984-08-21 ES ES535306A patent/ES8504543A1/en not_active Expired
- 1984-08-22 JP JP59174873A patent/JPS6064824A/en active Granted
- 1984-09-09 IL IL8472893A patent/IL72893A/en not_active IP Right Cessation
-
1985
- 1985-01-03 ES ES539329A patent/ES8607105A1/en not_active Expired
-
1986
- 1986-10-17 GB GB08624922A patent/GB2181091B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DK393084A (en) | 1985-02-23 |
| DK393084D0 (en) | 1984-08-16 |
| GB2145365B (en) | 1988-06-22 |
| DE3429141A1 (en) | 1985-03-07 |
| ES8607105A1 (en) | 1986-05-16 |
| BE900399A (en) | 1985-02-21 |
| FR2550990B1 (en) | 1987-01-30 |
| ES539329A0 (en) | 1986-05-16 |
| CH664327A5 (en) | 1988-02-29 |
| IL72893A0 (en) | 1984-12-31 |
| GB8421174D0 (en) | 1984-09-26 |
| GR80140B (en) | 1985-01-02 |
| JPH0423618B2 (en) | 1992-04-22 |
| GB2181091B (en) | 1988-06-08 |
| AU3220984A (en) | 1985-02-28 |
| GB2145365A (en) | 1985-03-27 |
| IT1179219B (en) | 1987-09-16 |
| ES535306A0 (en) | 1985-05-01 |
| IT8448734A1 (en) | 1986-02-17 |
| ES8504543A1 (en) | 1985-05-01 |
| DE3429141C2 (en) | 1994-04-21 |
| GB8624922D0 (en) | 1986-11-19 |
| BR8404135A (en) | 1985-07-16 |
| DK162972C (en) | 1992-06-15 |
| CA1231212A (en) | 1988-01-12 |
| JPS6064824A (en) | 1985-04-13 |
| AU571887B2 (en) | 1988-04-28 |
| ZA846390B (en) | 1986-03-26 |
| IT8448734A0 (en) | 1984-08-17 |
| GB2181091A (en) | 1987-04-15 |
| FR2550990A1 (en) | 1985-03-01 |
| IL72893A (en) | 1988-11-15 |
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Legal Events
| Date | Code | Title | Description |
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| PBP | Patent lapsed |