RS50986B - Pretforma plastične kutije naročito namenjene za pakovanje namirnica - Google Patents

Pretforma plastične kutije naročito namenjene za pakovanje namirnica

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Publication number
RS50986B
RS50986B RSP-2009/0235A RSP20090235A RS50986B RS 50986 B RS50986 B RS 50986B RS P20090235 A RSP20090235 A RS P20090235A RS 50986 B RS50986 B RS 50986B
Authority
RS
Serbia
Prior art keywords
flange
preform
thickness
cylindrical neck
edge
Prior art date
Application number
RSP-2009/0235A
Other languages
English (en)
Inventor
Bogumil Milkowski
Dariusz Lewandowski
Andrzej Toborowicz
Original Assignee
Invento Spolka Z.O.O.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Invento Spolka Z.O.O. filed Critical Invento Spolka Z.O.O.
Publication of RS50986B publication Critical patent/RS50986B/sr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
    • B65D1/023—Neck construction
    • 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
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • 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
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0724—Preforms or parisons characterised by their configuration having variable wall thickness at body portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B29C2949/0733—Preforms or parisons characterised by their configuration having variable diameter at body portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/0778—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the flange
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0812—Wall thickness of the lip, i.e. the very top of the preform neck
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0813—Wall thickness of the neck
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0816—Wall thickness of the flange
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0839—Angle
    • B29C2949/0844—Angle of the flange
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • 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
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • 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
    • B29C49/06—Injection blow-moulding
    • 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
    • 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
    • B29L2031/716—Bottles of the wide mouth type, i.e. the diameters of the bottle opening and its body are substantially identical
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Closures For Containers (AREA)
  • Packages (AREA)

Abstract

Pretforma plastične kutije posebno konstruisane za pakovanje namirnica koja sadrži jedno telo (4) kutije sa konveksnim hemisferičnim dnom (6), koje je koničnog oblika otvoreno nagore i završava se cilindričnim vratom (2) koji je opasan jednom prirubnicom (3) koja se završava ivicom (5), karakterisana time što je debljina (g1) prirubnice (3) koja okružuje cilindrični vrat (2) manja od 0,3mm. Prijava sadrži još 2 zavisna patentna zahteva.

Description

PRETFORMA PLASTIČNE
KUTIJE NAROČITO NAMENJENE ZA
PAKOVANJE NAMIRNICA
OBLAST PRONALASKA
Ovaj pronalazak odnosi se na pretformu plastične kutije posebno konstruisane za pakovanje namirnica. Ova pretforma se oblikuje upotrebom mašinerije za kalupljenje konvenicionalnim ubrizgavanjem koja se koristi za oblikovanje plastičnih kutija kao što su limenke, kutije za pakovanje hrane, i posebno kalupljenje duvanjem tankozidnih kutija koje se mogu hermetički zatvarati metalnim poklopcem učvršćenim za kutiju spajanjem/lem ljenjem prirubnice poklopca pomoću mašine za punjenje, bez deformisanja prirubnice ili cilindričnog vrata ispod nje.
STANJE TEHNIKE
Poljska patentna prijava br. P 336 680 Al odnosi se na plastičnu pretformu konstruisanu za oblikovanje tankozidnih kutija. Pretforma ima vrat sa zavojnicom i jedno cilindrično telo koje se završava konveksnim hemisferičnim dnom. Prečnik tela ove pretforme je 0,5 do 0,85 i debljina zida tela je 0,08 do 0,18 prečnika vrata.
Poznato je već neko vreme kako oblikovati tankozidne kutije koje se završavaju prirubnicom pomoću oblikovanja duvanjem konvencionalnih pretformi i onda odvajanjem gornjeg segmenta kutije uključujući narezani vrat. Na ovaj način stvara se ogromna količina škarta, što dovodi do toga da je ceo proces visoko neekonomičan. Štaviše, ovaj metod stvara značajnu neizvesnost oko pouzdanosti zatvaranja, uključujući njegovu hermetičnost i pružanje otpora pritisku iznutra. Ivice prirubnice kutije mogu biti zarezane sečenjem i njihova debljina može biti različita po obimu, što je normalno kada je prirubnica izlivena duvanjem kao deo bočnog zida jedne veće kutije.
U cilju zatvaranja plastične kutije radi njene nepropustljivosti pod pritiskom, najbolje je da kutija bude oblikovana iz brizganjem dobijenog predoblika pomoću procesa livenja razvlačnim duvanjem.
Patent EP 0482652B1 opisuje jednu cilindričnu pretformu sa ravnim dnom, gde je dno mnogo tanje od zidova pretforme koji se postepeno lagano odvajaju. Zbog činjenice da je sprečeno proticanje materijala, nemoguće je postići debljinu prirubnice koja je ispod 0,3mm. Pretforma prirubnice je gladak i nema zadebljanu ivicu.
Patent WO-A 83/01766 predstavlja pretformu koja je obično cilindričnog oblika i lagano se sužava nadole; njegovi zidovi i dno imaju istu debljinu. Prirubnica je glatka i nema zadebljanu ivicu. Može se zapaziti u dokumentu da je nemoguće postići dobar stepen orijentacije materijala prirubnice takve pretforme; otuda njena čvrstoća je nedovoljna za kvalitetno povezivanje metalnog poklopca i kutije.
Pretforma sa koničnim telom i konveksnim hemisferičnim dnom sa cilindričnim vratom koji se završava prirubnicom takodje je poznat kod patenta US 4 751 035. Cilindrični vrat ima prečnik koji je veći od najvećeg prečnika koničnog segmenta tela gde zid tela izmedju koničnog segmenta I cilindričnog vrata ima jedan izbojak. Prema ovom patentu pretforma je višeslojina i oblikovana je multiubrizgavajućim postupkom.
Najbolje rešenje za cilindrični vrat i prlrubnicu je da im dimenzije budu što je moguće bliže dimenzijama metalne kutije, da bi održale najbolje moguće parametre čvrstoće. Na ovaj način, kutija koja se oblikuje od pretforme pomoću postupka livenja razvlačnim duvanjem, mogla bi da se efikasno zatvori lemljenjem metalnog poklopca, i time da omogući pogodno zatvaranje za gazirane napitke pod pritiskom. Ovaj pronalazak omogućuje bolje rešavanje ovog problema.
KRATAK PRIKAZ PRONALASKA
Pretforma plastične kutije posebno konstruisane za pakovanje namirnica koja sadrži telo sa konveksnim hemisferičnim dnom, koje je koničnog oblika otvoreno nagore i završava cilindričnim vratom opasanim prirubnicom koja se savija prema spolja u odnosu na telo i završava rubom, karakterisan time da je debljina prirubnice koja okružuje cilindrični vrat manja od 0,3 mm. Telo je deblje pri dnu i debljina cilindričnog vrata je značajno manja od debljine dna.
Materijalna brzina proticanja u odlivku je relativno visoka za vreme procesa oblikovanja tako da je vreme koje je potrebno materijalu da postigne pretformu, uključujući prirubnicu, kratko i opada što je temperatura protočnog materijala niža, što omogućuje odgovarajuće punjenje i orijentisanje i omogućuje veću čvrstoću prirubnice. Na ovaj način, moguće je da debljina prirubnice bude manja od 0,3mm, što je potrebno za kvalitetno spajanje/lemljenje metalnog poklopca.
Poželjno je da debljina prirubnice bude manja ili jednaka debljini cilindričnog vrata i da, razmera debljine prirubnice prema debljini cilindričnog vrata bude približno 0,8.
U cilju da postupak spajanja omogući kvalitetnu vezu izmedju kutije pod pritiskom i metalnog poklopca, prirubnica treba da se završava zadebljanom zaobljenom ivicom sa krajevima koji se vide na jednoj ili obe strane. Visina zaobljene zadebljane ivice treba da varira od 1.1. do 2.0 debljine prirubnice.
KRATAK OPIS CRTEŽA
Ovaj pronalazak je detaljnije opisan u priloženim crtežima. Verujemo da će crteži llustrovati najefikasniju verziju pretforme. Crtež 1 prikazuje osni poprečni presek pretforme. Crtež 2 prikazuje uvećanu sliku prirubnice pretforme sa dvostrano zadebljanom zaobljenom ivicom. Crtež 3 pokazuje uvećanu sliku prirubnice pretforme sa jednostrano zaobljenom zadebljanom ivicom na gornjoj strani prirubnice. Crtež 4 pokazuje jednu uvećanu sliku prirubnice pretforme sa jednostrano zaobljenom donjom ivicom.
NAJEFIKASNIJA VERZIJA
Kao što je prikazano na crtežu 1 pretforma 1 jedne plastične kutije posebno konstruisane za pakovanje namirnica, sadrži jedno telo 4 sa konveksnim hemisferičnim dnom 6. Telo 4 ima koničan oblik i otvoreno je nagore završavajući se cilindričnim vratom 2 koji je opasan radijalnom prema spolja izduženom prirubnicom 3 koja se završava zadebljanom ivicom 5. Debljina tela 4 se postepeno smanjuje počev od dna 6, te je stoga, debljina g2 cilindričnog vrata 2 značajno manja od debljine g3 dna 6. Debljina prirubnice gl je manja od 0,3mm.
Crteži 2,3 i 4 pokazuju uvećani izgled ivice 5 prirubnice 3 pretforme 1. Ivica na crtežu 2 ima dvostrano zaobljeno zadebljanje 5a ispod i na vrhu prirubnice 3; ivica prikazana na crtežu 3 ima jednostrano zaobljeno zadebljanje 5b na vrhu prirubnice 3 tela 4 dok ivica prikazana na crtežu 4 ima jedno jednostrano zadebljanje 5c ispod prirubnice 3 prema dnu 6 tela 4. Visina h zaobljenog zadebljanja 5a, 5b ili 5c varira od 1.1 do 2.0 debljine gl prirubnice 3.
Pretforma 1 kao što je prikazano na crtežu 1 sa spoljm'm prečnikom Dl i visinom H načinjena je od polietilen tereftalata (PET) termoplastičnog materijala specijalno konstruisanog za pakovanje namirnica. Kada se koristi predmetna pretforma za livenje duvanjem kutije debelih zidova, prečnici Dl i D2 cilindričnog vrata 2 i prirubnice 3 se ne menjaju. Relativno mala debljina prirubnice omogućava bolje pasovanje metalnog poklopca kod prve faze postupka dvostrukog spajanja/lem ljenja. Zadebljavanje ivice prirubnice omogućuje dalje učvršćivanje metalnog poklopca usled pritiska tela kontejnera kod druge faze postupka dvostrukog spajanja/lemljenja.

Claims (3)

1. Pretforma plastične kutije posebno konstruisane za pakovanje namirnica koja sadrži jedno telo (4) kutije sa konveksnim hemisferičnim dnom (6), koje je koničnog oblika otvoreno nagore i završava se cilindričnim vratom (2) koji je opasan jednom prirubnicom (3) koja se završava ivicom (5), KARAKTERISANA TIME što je debljina (gl) prirubnice (3) koja okružuje cilindrični vrat (2) manja od 0,3mm,
2. Pretforma prema zahtevu 1, KARAKTERISANA TIME što je debljina (gl) prirubnice (3) manja ili je jednaka debljini (g2) cilindričnog vrata (2).
3. Pretforma prema zahtevu 1 ili 2 KARAKTERISANA TIME što ivica (5) prirubnice (3) ima jedno zaobljeno zadebljanje (5a) na svom gornjem i donjem delu, ili zaobljeno jednostrano zadebljanje (5b) na svom gornjem delu, ili zaobljeno jednostrano zadebljanje (5c) sa svoje donje strane, čija visina (h) varira od 1,1 do 2 debljine (gl) prirubnice (3).
RSP-2009/0235A 2003-11-20 2004-11-19 Pretforma plastične kutije naročito namenjene za pakovanje namirnica RS50986B (sr)

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PL363595A PL207809B1 (pl) 2003-11-20 2003-11-20 Preforma pojemnika z tworzywa sztucznego, zwłaszcza do środków spożywczych
PCT/PL2004/000092 WO2005049434A1 (en) 2003-11-20 2004-11-19 A preform of a plastic container particularly for packaging foodstuffs

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