• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    lO ll A B S T R A C T The present invention relates to a method formanufacturing a screw cap (l2), wherein the screw caphaving a blind hole with inner threads. The methodcomprising the steps of placing a piece pre-preg MFC(ll), of a suitable size for forming the screw cap,between a first tool (l) comprising a protruded part (2)with outer threads (4) for forming the inner threads (l7)of the blind hole (l4), and a second tool comprising asection (22) with an inner lateral surface (25) forforming an outer lateral surface (18) of the screw cap,moving the protruded part of the first tool into thesection of the second tool, such that, the first and the second tool forms the screw cap, drying the piece ofpre-preg MFC, such that it is shrinks onto the first tooland thereby forms the screw cap, and unscrewing theformed screw cap from the threads of the protruded partof the first tool. Fig. l
    公开号:SE1351478A1
    申请号:SE1351478
    申请日:2013-12-10
    公开日:2015-06-11
    发明作者:Lars Axrup
    申请人:Stora Enso Oyj；
    IPC主号:
    专利说明:

    lO METHOD AND ARRANGEMENT FOR MANUFACTURING A SCREW CAP The present invention relates to a method formanufacturing a screw cap, wherein the screw cap having a blind hole with inner threads.
    The invention further relates to an arrangement for manufacturing a screw cap in accordance with the method.
    The invention finally relates to a screw cap having a blind hole with inner threads.
    Cardboard packages for liquid or semi-liquid food stuffsuch as milk, water, juice, yoghurt etc. are well known.A major benefit with these cardboard packages is that thepackages are biodegradable to much more extent thanplastic packages. Recent years it has been more common,that the cardboard packages are equipped with an openingcomprising a screw cap, wherein the opening is made of aplastic such as polyethylene. The major benefit with thescrew cap is that the opening can be resealed, which isin favour for keeping the food stuff fresh. A drawbackwith polyethylene screw caps is that the amount ofplastics in the package in increased. Such polyethylenescrew caps are normally manufactured by injection moulding.
    In the following description of the invention the termmicrofibrillated cellulose (MFC) will be used. MFC isalso known as nanocellulose. It is a material typicallymade from wood cellulose fibres, both from hardwood orsoftwood fibres. It can also be made from microbialsources, agricultural fibres such as wheat straw pulp,bamboo or other non-wood fibre sources. Inmicrofibrillated cellulose the individual microfibrilshave been partly or totally detached from each other. A microfibrillated cellulose nanofiber is normally very thin (~20 nm) and the length is often between 100 nm to10 um. However, the microfibrils may also be longer, forexample between 10-200 um, but lengths even 2000 um canbe found due to wide length distribution. Fibres that hasbeen fibrillated and which have microfibrils on thesurface and microfibrils that are separated and locatedin a water phase of slurry are included in the definitionMFC. Furthermore, whiskers are also included in thedefinition MFC.
    It is an object of the present invention, to provide amethod of manufacturing a screw cap made ofmicrofibrillated cellulose, which eliminates oralleviates at least some of the above mentioned disadvantages of the prior art with plastic screw caps.
    The method according to the invention is characterized in that the method comprising the steps of: a) placing a piece pre-preg MFC, of a suitable size forforming the screw cap, betweena first tool comprising a protruded part with outerthreads for forming the inner threads of the blindhole, anda second tool comprising a section with an innerlateral surface for forming an outer lateral surfaceof the screw cap, b) moving the protruded part of the first tool into thesection of the second tool, such that the first andthe second tool forms the screw cap, c) drying the piece of pre-preg MFC, such that it isshrinks onto the first tool and thereby forms thescrew cap, and d) unscrewing the formed screw cap from the threads of the protruded part of the first tool.
    The arrangement according to the invention ischaracterized in that the arrangement comprising: - a first tool comprising a cylindrical part which parthaving outer threads for forming the blind hole and thethreads of the screw cap, and - a second tool comprising an inner lateral surface for forming an outer lateral surface of the screw cap.
    The screw cap according to the invention is characterizedin that it is manufactured in accordance with the method above.
    In the following, the invention will be described further with reference to the drawings, wherein: Figure 1 shows a first tool and a second tool formanufacturing a screw cap of MFC, wherein the first and the second tool is in a first position.
    Figure 2 shows the first tool and the second tool in a second position.
    Figure 3 shows a screw cap manufactured by the inventivemethod.
    Figure 1 and 2 shows a preferred embodiment of anarrangement for manufacturing a substantially cylinder-shaped screw cap 12 of a piece of pre-preg MFC 11. I.e. apiece of MFC which has been pre-impregnated or mixed,with a compatibilizer (optional), and a ground polymer ora polymer Latex such as PLA Latex. The piece of pre-pregMFC 11 has a dryness between 40-90%, preferably 60-80%.The piece of pre-preg MFC 11 has preferably at least onebarrier film. The barrier film is either arranged on one side or on each sides of the piece of pre-preg MFC 11.
    The arrangement comprising a first tool 1 and a secondtool 20, which tools 1, 20 are linear movable in respectto each other, such that, the first tool 1 can be movedinto the second tool 20. The screw cap 12 to bemanufactured, see fig. 3, comprises a circular blind hole14, which is limited by a circular bottom surface 15 anda cylindrical, inner lateral surface 16, which innerlateral surface 16 is provided with threads 17 forscrewing the screw cap 12 onto a package (not shown). Thescrew cap 12 further comprises a cylindrical, outerlateral surface 18 which faces away from the innerlateral surface 16 and a circular, top surface 19 whichfaces away from the bottom surface 15. The outer lateralsurface 18 having a suitable grip pattern 13, such asgrooves 13 in the axial direction of the screw cap 12 forfacilitate a user to screw and/or unscrew the screw cap from a package.
    The first tool 1 comprising a lower, cylindrical, firstpart 2; a middle, cylindrical, second part 6 and an upper, cylindrical, third part 8.
    The first part 2, of the first tool 1, having a firstdiameter A1 and comprises a cylindrical, first lateralsurface 3 for forming the inner lateral surface 16 of thescrew cap 12. The first part 2 further comprises acircular end surface 5 for forming the bottom surface 15of the screw cap 12, which end surface 5 facingdownwards. The first lateral surface 3 having outerthreads 4 for forming the inner threads 17 of the inner lateral surface 16 of the screw cap 12.
    The second part 6, of the first tool 1, is arrangedaxially with, and located above, the first part 2. Thesecond part 6 having a second diameter A2 and comprises a cylindrical, second lateral surface 7 of the first tool 1 for cutting the piece of pre-preg MFC to a desirable size, which is explained more in detail below.
    The third part 8, of the first tool 1, is arrangedaxially with both the first part 2 and second part 6. Thethird part 8 is located on top of the second part 6.Hence, the second part 6 is located between the firstpart 6 and the third part 8. The third part 8 having athird diameter A3 and comprises a third lateral surface 9for steering the first tool 1 into the second tool 20.The third diameter A3 is greater than the second diameterA2 and the second diameter A2 is greater than the firstdiameter A1. The transition between the first part 2 andthe second part 6 forms a first cutting edge 10 of thedevice at the first tool 1. In use the first part's 2outer lateral surface 3, with threads 4, forms the innersurface 16 and the threads 17 of the screw cap 12. Theend surface 6 of the first tool 1 forms the bottom surface 15 of the screw cap 12.
    The second tool 20 comprises an opening 28 of a blindhole 21, which blind hole comprises a lower, cylindrical,first section 22; a middle, cylindrical, second section 23 and an upper, conical, third section 24.
    The first section 22 is formed by a cylindrical,circumferential, first inner lateral surface 25 forforming the outer lateral surface 18 of the screw cap 12.The first inner lateral surface 25 having protrusions 30for forming the grooves 13 on the outer lateral surface18 of the screw cap 12. The first section 22 having a first inner diameter Bl.
    The second section 23 is formed by a cylindrical, secondinner lateral surface 26 for steering the first tool 1through the second tool 20. The second section 23 having a second inner diameter B2. lO The third section 24 is formed by a conical, third innerlateral surface 27 for folding the outer ends of thepiece of pre-preg MFC ll upwards. The third section 24having a third inner diameter B3. The third diameter B3increases continuously upwards towards the opening 28 ofthe blind hole 2l. The third diameter B3 is equal to thesecond diameter B2 in the transition between the thirdsection 24 and the second section 23. The second diameterB2 is smaller than the first Bl diameter, such that, thetransition between the first section 22 and the secondpart 6 forms a second cutting edge 29 of the device atthe second tool 20.
    For producing a screw cap l2 the method comprising thesteps of placing the first tool l and the second tool 20in a first position, which is shown in fig. l. In thefirst position, the first tool l is positioned at apredetermined distance away from second tool 20, whereinthe end surface 5 of the first tool l facing against the opening of the second tool 20.
    A piece of pre-preg MFC ll of a suitable size for forming the screw cap l2 is placed over the opening 28.
    The first tool l is then axially moved against the upperside of the piece of pre-preg MFC ll and into the opening28 of the second tool 20.
    Hence, the piece of pre-preg MFC ll is pushed by the endsurface 5 of the first tool l and into the third section24 of the blind hole 2l.
    The conical, third inner lateral surface 27 brings theouter parts of the piece of pre-preg MFC ll to be foldedupwards and behind that part of the piece of pre-preg MFC ll that is in contact with the end surface 5. l0 The piece of pre-preg MFC ll is continuously pushed bythe end surface 5, through the second section 23 of theblind hole 2l, towards the first section 22 of the secondtool 20.
    When the end surface 5 has reached the first section, theouter portions of the piece of pre-preg MFC is foldedupwards by the first inner lateral surface 25, such that, the cylindrical walls of the screw cap l2 is formed.
    When the first cutting edge l0 at the first tool reachesthe second cutting edge 29 at the second tool, the outerparts of the piece of pre-preg MFC ll are cut off betweenthe two cutting edges lO, 29.
    The first and second tool l, 20 have now finally reachedthe second position, which is shown in figure 2.
    The piece of pre-preg MFC ll is drying by the first l andsecond tools 20, which tools l, 20 have been heated to asuitable temperature for drying pre-preg MFC. A suitabletemperature of the tools is typically 50-200°C,preferably lOO-l70°C. The drying brings the piece ofpre-preg MFC to shrink, such that, the screw cap l2 isformed by the surrounding tools l, 20. The threads 4 ofthe first part 2 forms the inner threads l7 of the screwcap l2 and the protrusions 30 of the first inner lateralsurface 25 forms the grip pattern l3 of the outer lateral surface l8 of the screw cap l2.
    After completed drying, the screw cap l2 is unscrewedfrom the threads 4 of the first part 2.
    In the foregoing, the invention has been described on thebasis of a specific preferred embodiment. It isappreciated, however, that other embodiments and variants are possible within the scope of the following claims.
    For instance instead of moving the first tool, it isobvious that it also would be possible to move the secondtool upwards, or even both tools simultaneously.Moreover, the second tool could be in the form ofrotating rollers, wherein the circumferential surface ofthe rollers forms an inner lateral surface for formingthe outer lateral surface 18 of the screw cap and whereinthe pre-preg MFC is fed against the first tool by therotating rollers. Other possibilities of drying are alsopossible, for example drying with external heaters, suchas infrared heating/drying. It is also possible tomanufacture a screw cap with other grip pattern thangrooves or even a screw cap without a grip pattern.Moreover, the inner lateral surface of the first section,for forming the outer lateral surface of the screw cap, does not necessarily need to be cylindrical.
    权利要求:
    Claims (9)
    [1] 1. Method for manufacturing a screw cap (12), wherein thescrew cap (12) having a blind hole (14) with innerthreads (17), characterized in that the method comprisingthe steps of: a) placing a piece pre-preg MFC (11), of a suitable sizefor forming the screw cap, betweena first tool (1) comprising a protruded part (2) withouter threads (4) for forming the inner threads (17)of the blind hole (14), anda second tool comprising a section (22) with an innerlateral surface (25) for forming an outer lateralsurface (18) of the screw cap, b) moving the protruded part of the first tool into thesection (22) of the second tool, such that the firstand the second tool forms the screw cap, c) drying the piece of pre-preg MFC (11), such that it isshrinks onto the first tool and thereby forms thescrew cap (12), and d) unscrewing the formed screw cap (12) from the threads(14) of the protruded part of the first tool.
    [2] 2. Method according to claim 1, characterized in thatthe piece of pre-preg MFC has a dryness of 40-90%,preferably 60-80%.
    [3] 3. Method according to any of claims 1-2, characterizedin that the method further comprising the step of heatingthe first and the second tool to a temperature between50-200°C, preferably 100-170°C.
    [4] 4. Method according to any of claims 1-3, characterizedin that the method further comprising the step of cuttingoff the outer parts of the piece of pre-preg MFC (11) to a size suitable to form the screw cap (12).
    [5] 5. Method according to any of claims 1-4, characterizedin that the pre-preg MFC is MFC mixed with PLA Latex.
    [6] 6. Method according to any of claims 1-5, characterizedin that the piece of pre-preg MFC having at least one barrier film.
    [7] 7. The method according to claim 6, characterized in that the barrier film is a polyethylene film.
    [8] 8. Arrangement for manufacturing a screw cap inaccordance with the method of claims 1-7, characterizedin that the arrangement comprising: - a first tool (1) comprising a cylindrical part (2)which part having outer threads (4) for forming the blindhole (14) and the threads (17) of the screw cap (12), and- a second tool (20) comprising an inner lateral surface(25, 26, 27) for forming an outer lateral surface (18) of the screw cap (12).
    [9] 9. A screw cap (12) having a blind hole (14) with innerthreads (17), characterized in that it is manufactured in accordance with the method of claims 1-7.
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    同族专利:
    公开号 | 公开日
    EP3080003B1|2019-01-09|
    SE538088C2|2016-03-01|
    WO2015087221A1|2015-06-18|
    EP3080003A4|2017-10-04|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB607700A|1942-11-11|1948-09-03|American Seal Kap Corp|Improvements in or relating to paper screw caps|
    US3743128A|1969-05-22|1973-07-03|Klm Co|Closure and closure die|
    US4844270A|1988-06-13|1989-07-04|Rampart Packaging Inc.|Screw cap jar|
    JP4149887B2|2002-10-03|2008-09-17|ダイセル化学工業株式会社|Composite biodegradable molded product|
    CN101883895A|2007-09-14|2010-11-10|自然资源有限公司|Moulding of articles|
    JP5341787B2|2010-01-22|2013-11-13|学校法人同志社|Fiber reinforced composite bat|CN111469512A|2020-04-14|2020-07-31|江阴申隆包装材料有限公司|Food is with repeated heat-seal film and repeated heat-seal packaging film thereof|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351478A|SE538088C2|2013-12-10|2013-12-10|Method and apparatus for manufacturing a screw cap|SE1351478A| SE538088C2|2013-12-10|2013-12-10|Method and apparatus for manufacturing a screw cap|
    EP14869017.5A| EP3080003B1|2013-12-10|2014-12-05|Method for manufacturing a screw cap|
    PCT/IB2014/066640| WO2015087221A1|2013-12-10|2014-12-05|Method and arrangement for manufacturing a screw cap|
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