CA2069357A1 - Method of manufacturing profiles - Google Patents
Method of manufacturing profilesInfo
- Publication number
- CA2069357A1 CA2069357A1 CA2069357A CA2069357A CA2069357A1 CA 2069357 A1 CA2069357 A1 CA 2069357A1 CA 2069357 A CA2069357 A CA 2069357A CA 2069357 A CA2069357 A CA 2069357A CA 2069357 A1 CA2069357 A1 CA 2069357A1
- Authority
- CA
- Canada
- Prior art keywords
- polymer material
- melt
- point
- cross
- extrusion die
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
Links
Classifications
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/17—Articles comprising two or more components, e.g. co-extruded layers the components having different colours
-
- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
-
- 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
- B29C48/06—Rod-shaped
-
- 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
- B29C48/07—Flat, e.g. panels
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Powder Metallurgy (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Extrusion Of Metal (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE A method for manufacturing profiles from molten polymer materials by way of extrusion wherein the melt stream of second polymer material is channelled in the direction of flow into the main melt stream before the actual shaping process takes place and wherein the united melt streams are shaped in the extrusion die to form a profile extrudate which can be cut to length and removed after cooling. The degree to which the second polymer material dilates in the main melt stream is controlled by defining the distance between the injection point and the point at which the united melt streams enter the extrusion die and/or by defining the cross-sectional dimensions of the clear injection aperture for the second polymer material.
Description
2~693~
BAC~:G~D o~ av~ION
The p~e~ent in~rention relates ~o a m~thod ~or ~he manu~acture o~ profiles ~rom molten polymer materiAls by way of extrusion w~erein the m~lt stream o~ a second pc~lyme~
5 material is channelled in the direction o~ flc:~ into the ~nain melt stream beIore the ac:tual shaping process takes place and whereb~ the united m~lt s~rea2ns are shaped in the extrusion die tc: form a profile extruda~e which can be c:u~ to leng~h and removed a ~ter c:ool ing .
U. S . Patent No. 2 ,174 ~ 779 descr~be~ a device ~or ex~xuding di~f~rentl~ colored streams o~ pla3tic materials~
This device co~prisef; two ~ynchrono~lsly operatlng ext~u . ion ~ac~ine~ in which dli~ erently pigmerlted plastic n~aterials are melted and contreyed into a hopper. The melt stre~rPs are 15 extnlded in a ~e:peci~ic shape from thi~ intex~ediate hopper.
These melt streams can be fed to ~he ~xtrueiion process ~r~
~lended or unblended fo~m. This known device i5 capabl~, for e~ample, of prc~ducing rods with cro~ ections in which th~
di~erently colored material is distributed in a distinct 2 0 pattern , e . g ., in ~he æhape o a star~ Disk-~h~ped elements c~n the~ be cut ~rom such r~ds, e~g., ~or use as decarative elements. ~he drawback of such dcvice is that ~r each di~e~ent cross~sectional dimension, a special die cor-re~pan~ing to the de~ired cr~s-section must b~ connected to -- 1 `
~9~7 the inte~ediate hopper. This ~igni~icantly inc:re~es the production cc~sts for ~uch compon~nt~.
DES~IP~IO~ N
~his is where ~he inven1~ion csm~ss into its ~n. It 5 represents a ~ethDd ~nabling l~he simple produc~ion o:E
extr~ded pro~ile~ s~i$h a cro~s-Qection m~de up o~ two - different materials, the ~irst polymer ~naterial essentially for~ning those parts of the prs:~Pile whlch are visible in 'che ultimate application puxpose and the second polymer material ~:
10 essentially fon~ing the core ~ect~ ons of the prof ~ le which ~:
~oin these ultimately visible prc~r'ile parts.
In keeping with ~he invention, ~he de~ree t~ which the second polymer mat~rial dila~es in l;he ~uain melt fitream is ~:
~ontroller by clefining the d~stanc~ bet:ween the injection 1~ point and the point at which the un:Lted ~elt streams enter the extrusiorl die an~Jor by def ining ~he cross-sec~ional dimensions of the clear injs3ction apexture for ~he ~ecc~nd polymer mate:rl~l.
When wor~cing with one and ~he same die, t:he inYention 20 pro~ides the advan~age of being able ~o vary the ~egree to whi~h the second polymer ~ateri al dilates in ~he ~ir~t polymer material by alter~ng the distarlce o~ the in~ec~ion p~int~ ~his dis~ance can be ea~ily regul~ed since the ' ;"'; ' ~' ';
2~3~7 in~ection point Xor th~ s~cond pol~Der material need merely be ~ihifted int3 the de~;ired limits.
Howe~rer, the inventi~n alsc pe~Lits regulati~n o~ the degree to whi~h the secc~nd polymer materiaLl dilates in the 5 main mel~ stream ~y varying the cros~i-sectiGnal dimensions of ~he clear injection apertuLre~ The inv~ntior.L also er.Labl~s a co~nbin~ti~n ~:~ bot:h po~3sibilities of regulation ~hich as adv2ln~agec. i~;L view of the limi-tad thermostabi}ity of the polymer melt~ This provides an appropriate means of reducin~
o melt s~ream accumulations.
~ xisting profile die~ may ~e used in all of the three po~sible innovatory applic~tions~ i.e., t~ere is nc) need t9 ~La~Lufac;ture special pro~ile die~ for processing a ~econd material. Instead, the proce~s acc:ording to the pref~en~
15 invention merely requires the instaLllation of an intermediate in; ection pi~ce in fror.Lt o~ the extrlLsioh die in}et .
The degree to which the ~econd polymer materi al dilates in t~e ~ain melt stream can be lcept to a minimum b3~ ~eeding ~iLe un~ed ~Lelt ~tream~ more or less ~imultaneously ~ ntc, ~he 2 0 extru6ion die and by keeplng the s:;ros~-~ection of ~he cl~ar in~ection aperture for the sec~nd pclymsr material ~mall.
In this cas~, the injection point and ~he point at w}~ich the united melt streams are admitted into the extrusion die are virtually i~en~ical. In conj~nc~i~n wi~h the nç3gl~gible 2 ~ 7 dis~ance betweell these two points, the small cro6~-sectiorl o:~
t~e çlea~ inj~c~tion aperture ~or the second p~lymer material provides the basis ~f being able to keep ~o a minimum ~he ~egree to which the second pol~noer material dil ~tes ln the 5 main mslt strea~n, ~ owever, in cases w~ere th~ second polymer material is requir~d ~o dllate by a larger 63xtent in the ~ain melt s~ream, i t is necessa~y merely to increa~e the slis~ance between t~he injection pc~int and the point at which the melt 10 streams enter th~ eXtru&ic)n di~3 and to incre~se the cros~-sec:tis~n of the c:le~r in~ection ~perture ~or the se~nd polymer material.
Involving a minimum of e~ort, the inven~ion proVide~i the po~isibility o~ c:~ntrolling the ,extent o:~ ~lilation of the 15 second melt ~tre~m in the main melt ~;tream within ~he ~b~ve limits .
Experiments performed during the development phase of the invention revealed tha~ ideally a maximum distanc:e of 150 mm should be ~:elected between the pcint at ~hicl~ the second 20 polymer material is in~ected in the main melt stream and the point at whl~h th~ united melt streams are admîtted in the e~t~usion di~s. Increasing th~s IQaximum di~tance any further produces no i~oprovement in the dilation o~ l~he. secvnd polymer material in the main melt streanl~
2 ~ 7 I~ ~ras ~urth~mor~ esta:blished tha~ khe cro~s-~ction o~
the cl~ar i~jection aperture ~E~r the secbnd pc~lym~r material f~;hould ~e no more ~an ~6 o~ the c:ross-sec~ional are~ of th~
flow chanrJel for the Yirs~ polymer material. rncreasirlg thi6 S percentage any further i~ not adYisa~le since th~ vir~ual envelopm~nt of the second polymer material by the f ir~t pc: lymer ma~erial would no longer be guaran eed.
It h~s ~urtherm~re proved expedient to additionally adapt t~e melt stream of the secon~ polymer material to the lD requiremerlts o~ the ultima~e pro~ile by modi~ylng the cro s~
~3ec:~ion o~ the injection aperture. In this way, i~ i~
po~sible in the ini~ial shaping proc:ess to su~stitute speciIic areas OI the ultimate pro~i.le for the second po~ymex material whereas other areas oP the ultimate prof ile are composed exclusi~rely of the ~irs1: polymer material. Finally and in addition to ~he novel s~ep~ dlefi,Gribed abc>ve, dilation o~ e seconcl pol~er m~terial within the ~irs~ poly~er material may be ~urther enh~ncecl by altering ~he ~;pe~3~ ratios o~ both m~lt-steam ~crews~
The examples given ~elow are intended ~o illu~trate the new e f f ects OI varying the cross-~ecltional dimensions o~ the cle~r in~ection aperture, of ~raryin~ the distances between the poinl: o~ injection and die admission as well a~ a combination of hot:h. For ~his puxpose, it ha~ been as~;umed 3 ~ 7 that h~th the injec~lon aperture ~or the $econd polym~r material a: well as th~ extxusion die inlet aperture z~re perf ect:ly circular in cro~ 3ection . Th~se example~3 are based on an ~xt~s;ion die inlet apPr~ure o:~ 100 mm in 5 dia~eter. All experiments were p~3rfD~ed ~t a con~tarJt ~crew 6peed~
~xa~ple 1:
Constant ~lear injection aperture cross-~ection ~ith varied point o~ injecti~n.
1~ Inlet aper~ure: ~ 00 mm in dlame~er Clear injection aperture: 45 ~m Di~tance of injection point ~rom ~xtrusion di~: 1 ~m - Dila~îon o~ ~econd polymer ~ateria~.: 4S mm Clear injection aperture: 45 mm Distance of injection point ~ro~l extrusi~n die: 20 mm ~i~ation o~ second pol~mer mat~rial: 52 mm diameter Clear inj~c~ion ~perture: 45 ~m Dlstance of injection point from extru~ion die: 100 m~
~ tion of ~econd pol~er material: 60 mm diameter Example 2:
Varied d~ameter of injection aperture ~or second polymer ~aterial a~ constan~ distance of ~njec~ion pol~ ~rom point at which uni~ed melt streams ent~r the extrusion die.
Distance o~ injection pc~int frc:m die: 1 mm t;~lear in~ectit~n 21perture: 35 mm dîameter Dilation o~ ~econd p~lymer material: 3~ ~ diameter Glstance o~ iniection point ~rom die: 1 mm 5 Clear injectis~ aperture: 4~ mm diameter Dilation o:f ~;econd poly~n~r material: 40 :a~n diameter Di.stance o~ injection point ~rom die: 1 ~lear injection ~perture: 45 m~ diameter ~ilation of ~econd polymer ~ateri~l: 45 mm dia~e~er 10 ~istance of injection point ~rom die: 1 mm Clear 1njec~ion aperture: 50 mm diameter ~ilation of second polymer material; 4~ mm diamet~:r Example 3:
Varied clear injection apertUre ~nd distance o~ injection 15 poin~ ~rom die Dis~ance of in~ection point ~rom die~
Clear injecti~n ~perture: 45 mrn diameter Dila~ion o~ second polymer ma~erial: ~ 5 ~ di~meter tance of injectio:n point *ro~ die: ~0 mm 20 Clear in ~ecti~n aperture: 55 mm diameter Dilation of s~cond polymer material: 60 mm d~ameter 2~93~7 In zld~ition t~ ~he clrcular diamete~s of tha extrusion die and the clear in~ection aperture ~or ~he ~econd polymer ma~erl~l ~escribed in the exa~ples, the in~ren'ci~n al~o permits the u~e o~ other aperture cross ~ections. For 5 inst~nc:e, the clear injection aperture *or the second pol~e:r material may ~e oval, r~ctangulilr, I,-~h~ped or ~-~hapsd, etc.
The clear inj ec~ion aperture for the second polymer :material may also be arranged eccentric:ally o~f~ et in the flow channel in order to dir~ct the ~ecolld polyrner material at spe~i~ic lo a~eas o~ the ultimate prof ile.
~ h~ method according to the present invention permits the processing o~, for example, di~e~entl~ pi~mented poly~er materi21ls into proPiles, whereby the 2econd polymer Inaterial in the ultimate profile join~; ~;pec:i~ic profile areas o~ the 15 f~rst polymer materi~l. Using this technique, it i~ also possible ~o proce~ polym~r material~ wh~oh exhibit di~erent propertie~. Ho~ever applica~ions of thi~ type a~sume that the di~ferent polymer material~ are mutually c:ompat~ble and *orm an pern~nent bond during the extn~sion process.
20 ~inally, this techn1que al;o per~nits the combina~ion OI
recycled poly~e~ material and virgin polymer material.
For instance, dl~ring the developmJ3n~ p}la~e oJ~ the irlvention, a hollow pro~ile w~s extrud~:d with a center sec~ion ~onned almost completely ~ro~n the second polymer 2 ~ 7 material. Those parts of the holl~w profile visihle in the ultimate application we~e c~po~ed o~ virgin polymer material~ T~e hollow pro~ile selec~ed ~or this puxpos~ was a proflle with hollow ~hamber~ of the l:ype co~monly found in 5 window con~tru~ion ("Z profile'l~.
This pro~lle was used ~o manu~acture a ~rind~w, the dec~rative vi~ible ~Eaces o~ ~hich were colored white. This window, which wa~ provided with glazea infill and installed in the wall of a building showed absolutely no ~lgns of the 10 fact that the hollow chamber component jo~niny the dacorative vi~ible ~aces was made of recycle pc lymer material .
By using ~he process according to ~he present invention, the pa~t ~f the pro~ile joining ~he vislble ~a~es can be comple~ely concealed by a thin layer o~ ~irgln poly~er materlal. Only a~ter cu~tin~ through the profile does it ~ecome mani~est than the core ~ the prc~ile is ~r~ed l~rom the ~econd polymer material.
The part o~ the profile joining ~he visible îaces may however, also be ~ormed en~irely ~rom the ~eco~d polymer 20 ma~erial. Be~ore fitting the win~ow prof~le, i~ is po~ible in th~ ~ ca~e to ~ee on the outside that the pro~le ~ ~Lade from tWQ material ~ .
The meth4d according to the present in~e~t10n can be ide~lly used to process recycled pol~mer mater~ als in ",, ~
, '' ~ ' , :~ :
2~357 c~mbination with virgin polyme~ material. In this way, the ~irgin material can be used to form the visible ~aceq whereas the cro~ ecklon ~f the less conspicuous p~rt~ of s-lch pro~ile~ can be manu~actured from in~erior ~auality polym~
5 materials or rec~rcled material.
,, , ., ~, ;' "' ' .:
BAC~:G~D o~ av~ION
The p~e~ent in~rention relates ~o a m~thod ~or ~he manu~acture o~ profiles ~rom molten polymer materiAls by way of extrusion w~erein the m~lt stream o~ a second pc~lyme~
5 material is channelled in the direction o~ flc:~ into the ~nain melt stream beIore the ac:tual shaping process takes place and whereb~ the united m~lt s~rea2ns are shaped in the extrusion die tc: form a profile extruda~e which can be c:u~ to leng~h and removed a ~ter c:ool ing .
U. S . Patent No. 2 ,174 ~ 779 descr~be~ a device ~or ex~xuding di~f~rentl~ colored streams o~ pla3tic materials~
This device co~prisef; two ~ynchrono~lsly operatlng ext~u . ion ~ac~ine~ in which dli~ erently pigmerlted plastic n~aterials are melted and contreyed into a hopper. The melt stre~rPs are 15 extnlded in a ~e:peci~ic shape from thi~ intex~ediate hopper.
These melt streams can be fed to ~he ~xtrueiion process ~r~
~lended or unblended fo~m. This known device i5 capabl~, for e~ample, of prc~ducing rods with cro~ ections in which th~
di~erently colored material is distributed in a distinct 2 0 pattern , e . g ., in ~he æhape o a star~ Disk-~h~ped elements c~n the~ be cut ~rom such r~ds, e~g., ~or use as decarative elements. ~he drawback of such dcvice is that ~r each di~e~ent cross~sectional dimension, a special die cor-re~pan~ing to the de~ired cr~s-section must b~ connected to -- 1 `
~9~7 the inte~ediate hopper. This ~igni~icantly inc:re~es the production cc~sts for ~uch compon~nt~.
DES~IP~IO~ N
~his is where ~he inven1~ion csm~ss into its ~n. It 5 represents a ~ethDd ~nabling l~he simple produc~ion o:E
extr~ded pro~ile~ s~i$h a cro~s-Qection m~de up o~ two - different materials, the ~irst polymer ~naterial essentially for~ning those parts of the prs:~Pile whlch are visible in 'che ultimate application puxpose and the second polymer material ~:
10 essentially fon~ing the core ~ect~ ons of the prof ~ le which ~:
~oin these ultimately visible prc~r'ile parts.
In keeping with ~he invention, ~he de~ree t~ which the second polymer mat~rial dila~es in l;he ~uain melt fitream is ~:
~ontroller by clefining the d~stanc~ bet:ween the injection 1~ point and the point at which the un:Lted ~elt streams enter the extrusiorl die an~Jor by def ining ~he cross-sec~ional dimensions of the clear injs3ction apexture for ~he ~ecc~nd polymer mate:rl~l.
When wor~cing with one and ~he same die, t:he inYention 20 pro~ides the advan~age of being able ~o vary the ~egree to whi~h the second polymer ~ateri al dilates in ~he ~ir~t polymer material by alter~ng the distarlce o~ the in~ec~ion p~int~ ~his dis~ance can be ea~ily regul~ed since the ' ;"'; ' ~' ';
2~3~7 in~ection point Xor th~ s~cond pol~Der material need merely be ~ihifted int3 the de~;ired limits.
Howe~rer, the inventi~n alsc pe~Lits regulati~n o~ the degree to whi~h the secc~nd polymer materiaLl dilates in the 5 main mel~ stream ~y varying the cros~i-sectiGnal dimensions of ~he clear injection apertuLre~ The inv~ntior.L also er.Labl~s a co~nbin~ti~n ~:~ bot:h po~3sibilities of regulation ~hich as adv2ln~agec. i~;L view of the limi-tad thermostabi}ity of the polymer melt~ This provides an appropriate means of reducin~
o melt s~ream accumulations.
~ xisting profile die~ may ~e used in all of the three po~sible innovatory applic~tions~ i.e., t~ere is nc) need t9 ~La~Lufac;ture special pro~ile die~ for processing a ~econd material. Instead, the proce~s acc:ording to the pref~en~
15 invention merely requires the instaLllation of an intermediate in; ection pi~ce in fror.Lt o~ the extrlLsioh die in}et .
The degree to which the ~econd polymer materi al dilates in t~e ~ain melt stream can be lcept to a minimum b3~ ~eeding ~iLe un~ed ~Lelt ~tream~ more or less ~imultaneously ~ ntc, ~he 2 0 extru6ion die and by keeplng the s:;ros~-~ection of ~he cl~ar in~ection aperture for the sec~nd pclymsr material ~mall.
In this cas~, the injection point and ~he point at w}~ich the united melt streams are admitted into the extrusion die are virtually i~en~ical. In conj~nc~i~n wi~h the nç3gl~gible 2 ~ 7 dis~ance betweell these two points, the small cro6~-sectiorl o:~
t~e çlea~ inj~c~tion aperture ~or the second p~lymer material provides the basis ~f being able to keep ~o a minimum ~he ~egree to which the second pol~noer material dil ~tes ln the 5 main mslt strea~n, ~ owever, in cases w~ere th~ second polymer material is requir~d ~o dllate by a larger 63xtent in the ~ain melt s~ream, i t is necessa~y merely to increa~e the slis~ance between t~he injection pc~int and the point at which the melt 10 streams enter th~ eXtru&ic)n di~3 and to incre~se the cros~-sec:tis~n of the c:le~r in~ection ~perture ~or the se~nd polymer material.
Involving a minimum of e~ort, the inven~ion proVide~i the po~isibility o~ c:~ntrolling the ,extent o:~ ~lilation of the 15 second melt ~tre~m in the main melt ~;tream within ~he ~b~ve limits .
Experiments performed during the development phase of the invention revealed tha~ ideally a maximum distanc:e of 150 mm should be ~:elected between the pcint at ~hicl~ the second 20 polymer material is in~ected in the main melt stream and the point at whl~h th~ united melt streams are admîtted in the e~t~usion di~s. Increasing th~s IQaximum di~tance any further produces no i~oprovement in the dilation o~ l~he. secvnd polymer material in the main melt streanl~
2 ~ 7 I~ ~ras ~urth~mor~ esta:blished tha~ khe cro~s-~ction o~
the cl~ar i~jection aperture ~E~r the secbnd pc~lym~r material f~;hould ~e no more ~an ~6 o~ the c:ross-sec~ional are~ of th~
flow chanrJel for the Yirs~ polymer material. rncreasirlg thi6 S percentage any further i~ not adYisa~le since th~ vir~ual envelopm~nt of the second polymer material by the f ir~t pc: lymer ma~erial would no longer be guaran eed.
It h~s ~urtherm~re proved expedient to additionally adapt t~e melt stream of the secon~ polymer material to the lD requiremerlts o~ the ultima~e pro~ile by modi~ylng the cro s~
~3ec:~ion o~ the injection aperture. In this way, i~ i~
po~sible in the ini~ial shaping proc:ess to su~stitute speciIic areas OI the ultimate pro~i.le for the second po~ymex material whereas other areas oP the ultimate prof ile are composed exclusi~rely of the ~irs1: polymer material. Finally and in addition to ~he novel s~ep~ dlefi,Gribed abc>ve, dilation o~ e seconcl pol~er m~terial within the ~irs~ poly~er material may be ~urther enh~ncecl by altering ~he ~;pe~3~ ratios o~ both m~lt-steam ~crews~
The examples given ~elow are intended ~o illu~trate the new e f f ects OI varying the cross-~ecltional dimensions o~ the cle~r in~ection aperture, of ~raryin~ the distances between the poinl: o~ injection and die admission as well a~ a combination of hot:h. For ~his puxpose, it ha~ been as~;umed 3 ~ 7 that h~th the injec~lon aperture ~or the $econd polym~r material a: well as th~ extxusion die inlet aperture z~re perf ect:ly circular in cro~ 3ection . Th~se example~3 are based on an ~xt~s;ion die inlet apPr~ure o:~ 100 mm in 5 dia~eter. All experiments were p~3rfD~ed ~t a con~tarJt ~crew 6peed~
~xa~ple 1:
Constant ~lear injection aperture cross-~ection ~ith varied point o~ injecti~n.
1~ Inlet aper~ure: ~ 00 mm in dlame~er Clear injection aperture: 45 ~m Di~tance of injection point ~rom ~xtrusion di~: 1 ~m - Dila~îon o~ ~econd polymer ~ateria~.: 4S mm Clear injection aperture: 45 mm Distance of injection point ~ro~l extrusi~n die: 20 mm ~i~ation o~ second pol~mer mat~rial: 52 mm diameter Clear inj~c~ion ~perture: 45 ~m Dlstance of injection point from extru~ion die: 100 m~
~ tion of ~econd pol~er material: 60 mm diameter Example 2:
Varied d~ameter of injection aperture ~or second polymer ~aterial a~ constan~ distance of ~njec~ion pol~ ~rom point at which uni~ed melt streams ent~r the extrusion die.
Distance o~ injection pc~int frc:m die: 1 mm t;~lear in~ectit~n 21perture: 35 mm dîameter Dilation o~ ~econd p~lymer material: 3~ ~ diameter Glstance o~ iniection point ~rom die: 1 mm 5 Clear injectis~ aperture: 4~ mm diameter Dilation o:f ~;econd poly~n~r material: 40 :a~n diameter Di.stance o~ injection point ~rom die: 1 ~lear injection ~perture: 45 m~ diameter ~ilation of ~econd polymer ~ateri~l: 45 mm dia~e~er 10 ~istance of injection point ~rom die: 1 mm Clear 1njec~ion aperture: 50 mm diameter ~ilation of second polymer material; 4~ mm diamet~:r Example 3:
Varied clear injection apertUre ~nd distance o~ injection 15 poin~ ~rom die Dis~ance of in~ection point ~rom die~
Clear injecti~n ~perture: 45 mrn diameter Dila~ion o~ second polymer ma~erial: ~ 5 ~ di~meter tance of injectio:n point *ro~ die: ~0 mm 20 Clear in ~ecti~n aperture: 55 mm diameter Dilation of s~cond polymer material: 60 mm d~ameter 2~93~7 In zld~ition t~ ~he clrcular diamete~s of tha extrusion die and the clear in~ection aperture ~or ~he ~econd polymer ma~erl~l ~escribed in the exa~ples, the in~ren'ci~n al~o permits the u~e o~ other aperture cross ~ections. For 5 inst~nc:e, the clear injection aperture *or the second pol~e:r material may ~e oval, r~ctangulilr, I,-~h~ped or ~-~hapsd, etc.
The clear inj ec~ion aperture for the second polymer :material may also be arranged eccentric:ally o~f~ et in the flow channel in order to dir~ct the ~ecolld polyrner material at spe~i~ic lo a~eas o~ the ultimate prof ile.
~ h~ method according to the present invention permits the processing o~, for example, di~e~entl~ pi~mented poly~er materi21ls into proPiles, whereby the 2econd polymer Inaterial in the ultimate profile join~; ~;pec:i~ic profile areas o~ the 15 f~rst polymer materi~l. Using this technique, it i~ also possible ~o proce~ polym~r material~ wh~oh exhibit di~erent propertie~. Ho~ever applica~ions of thi~ type a~sume that the di~ferent polymer material~ are mutually c:ompat~ble and *orm an pern~nent bond during the extn~sion process.
20 ~inally, this techn1que al;o per~nits the combina~ion OI
recycled poly~e~ material and virgin polymer material.
For instance, dl~ring the developmJ3n~ p}la~e oJ~ the irlvention, a hollow pro~ile w~s extrud~:d with a center sec~ion ~onned almost completely ~ro~n the second polymer 2 ~ 7 material. Those parts of the holl~w profile visihle in the ultimate application we~e c~po~ed o~ virgin polymer material~ T~e hollow pro~ile selec~ed ~or this puxpos~ was a proflle with hollow ~hamber~ of the l:ype co~monly found in 5 window con~tru~ion ("Z profile'l~.
This pro~lle was used ~o manu~acture a ~rind~w, the dec~rative vi~ible ~Eaces o~ ~hich were colored white. This window, which wa~ provided with glazea infill and installed in the wall of a building showed absolutely no ~lgns of the 10 fact that the hollow chamber component jo~niny the dacorative vi~ible ~aces was made of recycle pc lymer material .
By using ~he process according to ~he present invention, the pa~t ~f the pro~ile joining ~he vislble ~a~es can be comple~ely concealed by a thin layer o~ ~irgln poly~er materlal. Only a~ter cu~tin~ through the profile does it ~ecome mani~est than the core ~ the prc~ile is ~r~ed l~rom the ~econd polymer material.
The part o~ the profile joining ~he visible îaces may however, also be ~ormed en~irely ~rom the ~eco~d polymer 20 ma~erial. Be~ore fitting the win~ow prof~le, i~ is po~ible in th~ ~ ca~e to ~ee on the outside that the pro~le ~ ~Lade from tWQ material ~ .
The meth4d according to the present in~e~t10n can be ide~lly used to process recycled pol~mer mater~ als in ",, ~
, '' ~ ' , :~ :
2~357 c~mbination with virgin polyme~ material. In this way, the ~irgin material can be used to form the visible ~aceq whereas the cro~ ecklon ~f the less conspicuous p~rt~ of s-lch pro~ile~ can be manu~actured from in~erior ~auality polym~
5 materials or rec~rcled material.
,, , ., ~, ;' "' ' .:
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:-
1. In a method for manufacturing profiles from molten polymer materials by way of extrusion wherein the melt stream of a second polymer material is channelled in the direction of flow into the main melt stream before the actual shaping process takes place and wherein the united melt streams are shaped in the extrusion die to form a profile extrudate which can be cut to length and removed after cooling, the improve-ment comprising controlling the degree to which the second polymer material dilates in the main melt stream by defining the distance between the injection point and the point at which the united melt streams enter the extrusion die and/or by defining the cross-sectional dimensions of the clear injection aperture for the second polymer material.
2. Method according to claim l, wherein the degree to which the second polymer material dilates in the main melt stream is kept to a minimum by feeding the united melt streams substantially ssimultaneously into the extrusion die and by keeping the cross-section of the clear injection aperture for the second polymer material small.
3. Method according to claim 1, wherein, in cases where the second polymer material is required to dilate by a larger extend in the main melt stream, the distance between the injection point and the point at which the melt streams enter the extrusion die is increased and the cross-section of the clear injection aperture for the second polymer material is increased.
4. Method according to claim 1, wherein the distance between the point at which the second polymer material is injected into the main melt stream and the point at which the united melt streams are admitted into the extrusion die is maximally 150 mm.
5. Method according to claim 1, wherein the cross-section of the clear injection aperture for the second polymer material is no more than 70% of the cross-sectional area of the flow channel for the first polymer material.
6. Method according to claim 1, wherein the melt stream of the second polymer material is additionally adapted to the requirements of the ultimate profile by modifying the cross-section of the injection aperture.
7. Method according to claim 1, wherein dilation of the second polymer material within the first polymer material is further enhanced by altering the speed ratios of both melt-stream screws.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4116811A DE4116811C2 (en) | 1991-05-23 | 1991-05-23 | Process for making profiles |
| DEP4116811.9 | 1991-05-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2069357A1 true CA2069357A1 (en) | 1992-11-25 |
Family
ID=6432238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2069357A Abandoned CA2069357A1 (en) | 1991-05-23 | 1992-05-25 | Method of manufacturing profiles |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0514725B1 (en) |
| AT (1) | ATE121344T1 (en) |
| CA (1) | CA2069357A1 (en) |
| CS (1) | CS151392A3 (en) |
| DE (1) | DE4116811C2 (en) |
| DK (1) | DK0514725T3 (en) |
| ES (1) | ES2073809T3 (en) |
| GR (1) | GR3015965T3 (en) |
| PL (1) | PL169364B1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2174779A (en) * | 1937-12-16 | 1939-10-03 | George Morrell Corp | Apparatus for extruding varicolored plastics |
| FR1478605A (en) * | 1966-03-16 | 1967-04-28 | Extrusion head for the production of twisted multicolored profiles, in plastic | |
| JPS4945793B1 (en) * | 1969-07-19 | 1974-12-06 | ||
| US4289408A (en) * | 1976-02-23 | 1981-09-15 | The Gillette Company | Marbleization of plastic materials |
| DE8523692U1 (en) * | 1985-08-17 | 1987-10-15 | Schleberger, Albert, 5600 Wuppertal, De |
-
1991
- 1991-05-23 DE DE4116811A patent/DE4116811C2/en not_active Expired - Fee Related
-
1992
- 1992-05-09 EP EP92107833A patent/EP0514725B1/en not_active Expired - Lifetime
- 1992-05-09 DK DK92107833.3T patent/DK0514725T3/en active
- 1992-05-09 ES ES92107833T patent/ES2073809T3/en not_active Expired - Lifetime
- 1992-05-09 AT AT92107833T patent/ATE121344T1/en not_active IP Right Cessation
- 1992-05-11 PL PL92294503A patent/PL169364B1/en not_active IP Right Cessation
- 1992-05-20 CS CS921513A patent/CS151392A3/en unknown
- 1992-05-25 CA CA2069357A patent/CA2069357A1/en not_active Abandoned
-
1995
- 1995-04-28 GR GR950401088T patent/GR3015965T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0514725A1 (en) | 1992-11-25 |
| PL294503A1 (en) | 1993-02-22 |
| ATE121344T1 (en) | 1995-05-15 |
| DE4116811C2 (en) | 1997-04-03 |
| ES2073809T3 (en) | 1995-08-16 |
| GR3015965T3 (en) | 1995-07-31 |
| PL169364B1 (en) | 1996-07-31 |
| EP0514725B1 (en) | 1995-04-19 |
| DE4116811C1 (en) | 1992-04-23 |
| DK0514725T3 (en) | 1995-09-11 |
| CS151392A3 (en) | 1992-12-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |