CA1140716A - Extruding die apparatus for producing a plastic closure strip - Google Patents
Extruding die apparatus for producing a plastic closure stripInfo
- Publication number
- CA1140716A CA1140716A CA000348716A CA348716A CA1140716A CA 1140716 A CA1140716 A CA 1140716A CA 000348716 A CA000348716 A CA 000348716A CA 348716 A CA348716 A CA 348716A CA 1140716 A CA1140716 A CA 1140716A
- Authority
- CA
- Canada
- Prior art keywords
- profile
- die
- base
- die body
- extruding
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D5/00—Producing elements of slide fasteners; Combined making and attaching of elements of slide fasteners
- B29D5/10—Producing elements of slide fasteners; Combined making and attaching of elements of slide fasteners the interlocking members being formed by continuous profiled strip
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0013—Extrusion moulding in several steps, i.e. components merging outside the die
- B29C48/0014—Extrusion moulding in several steps, i.e. components merging outside the die producing flat articles having components brought in contact outside the extrusion die
-
- 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
- B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
-
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
-
- 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
- B29C48/08—Flat, e.g. panels flexible, e.g. films
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Making Paper Articles (AREA)
- Bag Frames (AREA)
Abstract
EXTRUDING DIE APPARATUS FOR
PRODUCING A PLASTIC CLOSURE STRIP
ABSTRACT OF THE DISCLOSURE
An extrusion die apparatus for producing at least one plastic closure strip having profile and base portions, includes a die body having a die face, a profile channel defined in the die body and communicating with a profile die opening in the die face for extruding a profile portion, and a base channel defined in the die body and communicating with a base die opening in the face for extruding a base portion. The channels are adjacent to each other near the die openings and separated by a portion of the die body which terminates short of the face so that the extruded profile and base portions join together before exiting the die body.
S P E C I F I C A T I O N
PRODUCING A PLASTIC CLOSURE STRIP
ABSTRACT OF THE DISCLOSURE
An extrusion die apparatus for producing at least one plastic closure strip having profile and base portions, includes a die body having a die face, a profile channel defined in the die body and communicating with a profile die opening in the die face for extruding a profile portion, and a base channel defined in the die body and communicating with a base die opening in the face for extruding a base portion. The channels are adjacent to each other near the die openings and separated by a portion of the die body which terminates short of the face so that the extruded profile and base portions join together before exiting the die body.
S P E C I F I C A T I O N
Description
;
$
The present invention relates to an extrusion die apparatus for producing a plastic closure device including two closure strips, wherein each closure strip includes profile and base portions and particularly to an extrusion die apparatus for producing a plastic closure strip in which the extruded profile and base portions ` join together before exiting the die body.
Plastic bags including plastic closure devices are well-known and in popular use. Typically, a plastic closure device includes two closure strips which interlock together. Each closure strip includes a profil~ portion and a base portion.
It is the two complementary profile portions of two closure strips which become occluded when the closure device is closed. The integrity of the shapes of the profile portions must be maintained during the production of the closure strips so that good occlusion is obtained. In addition,.the joining together of the profile and base portions must be done in a manner to avoid distortions which can interfere with the preferred shape of the closure strip.
. 12366 The prior art method and apparatus f~r producing a closure strip includes the separate extrusion and forming of pr~file and base portiDns and subsequently, joining th~se portions together. This method has drawbacks and is not suitable fDr commercial high production of many closure strips. One drawback is that relatively slow cooling, such as air cooling, is required and this results in low production rates.
The instant invention overcomes the problems arising from the prior art method and apparatus. The invention allows good control of the extrusion 3f the profile and base portions as well as a good maintenance of the integrity of the ~hape of the closure strip. An additional feature is that different plastic mat~rial can be used for the profile and base portions.
one em'o~diment of the invention is an extrusion die apparatus for producing at least one plastic closure strip having profile and base portions, comprising a die ~od~ having a die face, at least a first profile channel defined in the die body and communicating with a correspond-ing first profile die opening in the die face for extruding a first pro:Eile portion, and at least a first b2se channel defined in the die b~dy andcommunicating with a correspcnd-ing first base die opening in the die face for extruding ? 12366 73l6 a first base p~rtion, the first profile and first base channels being adjacent tD each other near the first profile and first base die openings and separated by a first portion of the die bDdy which terminates short ~f the die face so that the extruded first profile pDrtion and first base portion join to~ether before exiting the die body, Another embodiment of the invention further includes a second profile channel defined in the die body and communicating with a corresponding second profile die opening in the die face for extruding a second pro~ile portion, and a second base channel defined in the die bodyand communicating with a corresponding second base die opening in the die face for extruding a second base portion~ the second profile and second base channels being adjacent to each other near the second profile and second base d~e openings and separated by a second portiDn of the die body which terminates short of the die face so that the extruded second profile portion and second base portion join together before exitin~ the die body.
A further embod~ment of the invention teaches a plurality of separate profile channels de~ined in the die body and co~munica~ng with corsesponding profile die openings in the die face for extruding separate profile portions, the plurality Df profile channels being .
~ ~ 12366 ` ~L4 ...
adjacent to the first base ch~nnel near the die openings and separated by the first portioR of the die body so that the extruded plurality Df profile portions join the first base portion bef3re all of the portions exit the die body.
Yet another embodiment of the invention is in the method f~ producing at least one plastic closure strip having profile and base portions comprising ex~ruding at least a first profile portion, ex~rudin~ at least a first base portion, and joining the first profile and first base portions ~ogether, the improvement wherein the first profile and ~irst base portions are joined together before exiting the die body.
Further embodiments and advantages of the invention will be set forth in part in the following specification and in part will be obvious therefrom without being specifically referred to, the same being realized and attained as pointed out in ~he claims hereof The invention accord~ngly comprisPs the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereina~tar set forth and the scope of the application of ~hich will be indicated in the claims.
For a ful~er understanding of the natu~e and objects of the lnvention9 reference should be had to the - ~
' : : 12366 07~.~
fDllowing detailed description, taken in connection with the accompanying drawings, in which:
Fig. l shDws a cross-sectional view Qf two closure strips which form a closure device ~nd which are suitable for being produced by the inventiDn;
Fig. 2 shows a plastie bag incorporating a closure device as shown in Fig. l;
Fig. 3 showc diagrammatic side elevatlonal view of an extrusion system including an apparatus according to the invention;
Fig. 4 is a diagrammatic sectional view of ~n apparatus according to the invention;
Fig. 5 is a diagrammatic par~ial sec~ional view showing another embodiment of an apparatus according to the inventiDn;
Fig. 6 is a perspective view of a control bar used in Fig~ 4;
Fig. 7 is a perspective sectional view Df another control bar used in Fig. 4;
Figs. 8A, 8B, ~nd 8C are sectional views Df different control bars;
Fig. 9 ;s a diagrammatic partial sectional view ~hvwing another embodiment of a flow diverter-~r he appara~us shown in Fig. 4; and 6.
~4Q'7~
Figs. lOA and lOB each shows a cross-sectional view of a combined closure strip produced by an apparatus according to the invention.
In carrying the invention into effect, certain embodiments have been selected for illustration in the accompanying drawings and for description in the specification, reference being had to the Figs. 1 to 10.
Fig. 1 shows a closure device which may be produced in accordance with the instant invention. The profile portion 20 is joined to a base portion 21 and profile portion 22 is joined to base portion 23. The profile portions 20 and 22 are complementary and profile portion 20 can be engaged in the pro~ile portion 22. The two closure strips 25~ and 25B
constitute a closure device.
Fig. 2 shows a typical plastic bag 24 which includes a closure device 26. It has been found economical to produce the two closure strips of the closure device 26 separately and connect them to a film web during the manufacturing of the bag 24.
Thus, it is desirable to have an economical and reliable e~trusion die apparatus for producing the closure strips which constitute closure device 26.
~ 1 4(~7 1 ~ 12366 The closure strips of clDsure device 26 can be made by an extrusiDn system which includes an extrusi~n die apparatus in accordance with the inventiDn as shDwn in Fig. 3. Extruder 27 is cDnnected by a conduit28 to an extrusion die apparatus 29. Extruded closure strips 31 and 32 are produced by the extrusion die apparatus and enter a cooling bath 33, such as a container of water and are then redirected by rollers 34 and 36 to nip rollers 37 where the closure strips 31 and 32 are occluded together to form a continuous closure device 38. The rate at which the continuous cl~sure device 38 is produced depends upon the size and screw speed of the extruder 27, melt flow of the material, the speed of the nip rollers 37, ~he cooling rate, and the adjustment of the die componPnts producing the closure strips 31 and 32 as well as other fact~rs.
Generally, equipment for extruding plastic material is well-known in the art and considerable prior ar~ exis~s relevant to the extrusion of closure devices.
Fi~. 4 shows a partial sectional view of an extrusion die apparatus in accordance with ~he inventi~n and details such as assembly screws, die heaters, sensing e~ntrDl elements, etc. have bee~ omitted for clari~y. The flow diverter 40 establishes the distribution pattern for the plastic material being supplied. PlastiC~mat2rial under pressure is communicated ~o the channels 41 and 42 and ~ O ~ ~ ~ ' 12366 then through the flow diverter 40. Channel 41 is cDnnected to a contrvl orifice 43 and an adjustable valve control 44 before reach;ng contrDl bar 46 and die opening 45. The die opening 45 is an Dutlet and shape controller for a base portiDn.
The channel 42 is connected to channels 42A, 42b and 42c. The channel 42a goes through a control orifice 48 and an adjustable valve control 49 before reaching control bar 51 and di~ opening 52. The die opening 52 is an outlet and shape controller for a closure profile. The die body portiDn 47 between the channels 41 and 42a terminates short of the face of the die body so that the profile and base portions contact each other and join together before exiting frDM the die body to form a closure strip 54.
The apparatus shown in Fig. 4 includes a part for producing another closure strip 68 which is comple-mentary to the closure strip 54.
The channels 42b and 42c pass through control orifices 56 and 57 and adjustable valve controls 58 and 59 and eventually reach control bars 61 and 62. Die opening 63 is an outlet and shape contrDller fDr a profile por~ion 64 and die opening 66 is an outlet and shape controller for a base portion 67. --~ 7 ~ 12366 The profile portion 64 and base portion 67 contact each other and join together befDre exiting the die body tD form closure strip 68 The closure strips 54 and ~8 enter a water bath 69 for cooling the plastic material.
Fig. 5 shows, in part, another embodiment for the extrusion of closure strips. For the embodiment in Fig. 5, the closure strips are reversed as compared to the embodiment shown in Fig. 4. That is, profiles 70 and 71 face each other while the base portions 72 and 73 are on the outside of the closure strips 74 and 76. The difference in the arrangement shown between Fig. 4 and 5 can be achieved by the choice of arrangement of the control bars 46, 51, 61 and 62.
Fig. 6 shows a typical control bar 81 for producing a base portion of a closure strip. A lead-in taper 82, control "land" 83, and recess 84 are factors determining the size and shape of the extruded material.
The control land 83 and recess ~4 are shDwn as being linear, but this is not necessarily the pre~erred embodiment. Generally~ the control land 83 can be either a gentle contour ~x have s~ps of different depths The control land 83 can bP straight in the dir~ction determining width and havP a variable height so that thickness variations can be contrDlled.
~ 0 .
~,~7 12366 ~ 7 ~ ~
The width of the control land 83 depends upon the width of the base portion desired. Mounting holes 86 allow the control bar 81 to be mounted Dr removed conveniently.
Fig. 7 shows a sectional perspectivP view of a control bar 87 for producing a profile portion of a closure strip. A counter bore 88 communicates with a plastic material being supplied under pressure and also co~municates with channel 89 which defines the shape of the prDfile portion. The channel 89 can be formed with goo~ precision through the use of an electrodeposition method in accordance with ~no~n technology. The mounting hole 91 permits the mounting ind removal of the control bar 87.
Figs. 8A, 8~, and 8C show cross-sec~ional views of three control bars having profile channels in different locations. Profile bar 92A shows profile channel 93A
with die opening 94A spaced apar~ from the location of where the diP npening for the base portion would be Sb that the base and profile portions join together outside the die body in accordance with the pri~r art. Control bar 92B
shows profile channel 93B having a die opening 94B which will produce base and profile portions which will join together just before exi~ing the die body because the die body portion 96B is just short of the die ~ace. Control bar 92C includes 11, ~ -J . 12366 114(~171~
a profile channel 93C and a die opening 94C and features a die body portion 96C which is recessed from about 0.010 inch to about 0.250 inch away fxom the face 97C, preferably from about 0.015 inch to about 0.09 inch. The separation between the profile and base channels at the die openings is less than 0.040 inch and preferably about 0.020 inch and more preferably yet from about 0.002 inch to about 0.008 inch. The profile and base portions produced will join together before exiting the die body. The control bar 92C can be used advantageously with a low draw ratio of about 1:4, a high operating speed of about 300 feet per minute, and rapid cooling means such as a water bath.
Cooling can also be established by liquid spray or other known ways.
Fig. 9 shows a partial sectional view of another en~odiment of a flow diverter. Channel 100 supplies plastic material to one base portion extrusion opening whereas channel 101 communicates with channels lOla, lOlb, and lOlc for forming two profile portions as well as one base portion. This arrangement permits the selection of one of the portions as being a different color or composition from the other portions.
Figs. lOA and lOB show two intermediate products which can be extruded from an extrusion die apparatus according to the invention by positioning two profile die openings near a wida ~ase die opening. Cutting base portion 106 ~etween the profile portions lU7 and 108 will produce two closure strips. Similar operations on base portion 109 will produce four closure strips.
` 1~40~ ;; 123~6 It is to be understood that there is no desire for the invention to be limited to the exact details of constructlon shown and described, for obvious modifications will occur to a person skilled in the art.
Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is as follows:
_
$
The present invention relates to an extrusion die apparatus for producing a plastic closure device including two closure strips, wherein each closure strip includes profile and base portions and particularly to an extrusion die apparatus for producing a plastic closure strip in which the extruded profile and base portions ` join together before exiting the die body.
Plastic bags including plastic closure devices are well-known and in popular use. Typically, a plastic closure device includes two closure strips which interlock together. Each closure strip includes a profil~ portion and a base portion.
It is the two complementary profile portions of two closure strips which become occluded when the closure device is closed. The integrity of the shapes of the profile portions must be maintained during the production of the closure strips so that good occlusion is obtained. In addition,.the joining together of the profile and base portions must be done in a manner to avoid distortions which can interfere with the preferred shape of the closure strip.
. 12366 The prior art method and apparatus f~r producing a closure strip includes the separate extrusion and forming of pr~file and base portiDns and subsequently, joining th~se portions together. This method has drawbacks and is not suitable fDr commercial high production of many closure strips. One drawback is that relatively slow cooling, such as air cooling, is required and this results in low production rates.
The instant invention overcomes the problems arising from the prior art method and apparatus. The invention allows good control of the extrusion 3f the profile and base portions as well as a good maintenance of the integrity of the ~hape of the closure strip. An additional feature is that different plastic mat~rial can be used for the profile and base portions.
one em'o~diment of the invention is an extrusion die apparatus for producing at least one plastic closure strip having profile and base portions, comprising a die ~od~ having a die face, at least a first profile channel defined in the die body and communicating with a correspond-ing first profile die opening in the die face for extruding a first pro:Eile portion, and at least a first b2se channel defined in the die b~dy andcommunicating with a correspcnd-ing first base die opening in the die face for extruding ? 12366 73l6 a first base p~rtion, the first profile and first base channels being adjacent tD each other near the first profile and first base die openings and separated by a first portion of the die bDdy which terminates short ~f the die face so that the extruded first profile pDrtion and first base portion join to~ether before exiting the die body, Another embodiment of the invention further includes a second profile channel defined in the die body and communicating with a corresponding second profile die opening in the die face for extruding a second pro~ile portion, and a second base channel defined in the die bodyand communicating with a corresponding second base die opening in the die face for extruding a second base portion~ the second profile and second base channels being adjacent to each other near the second profile and second base d~e openings and separated by a second portiDn of the die body which terminates short of the die face so that the extruded second profile portion and second base portion join together before exitin~ the die body.
A further embod~ment of the invention teaches a plurality of separate profile channels de~ined in the die body and co~munica~ng with corsesponding profile die openings in the die face for extruding separate profile portions, the plurality Df profile channels being .
~ ~ 12366 ` ~L4 ...
adjacent to the first base ch~nnel near the die openings and separated by the first portioR of the die body so that the extruded plurality Df profile portions join the first base portion bef3re all of the portions exit the die body.
Yet another embodiment of the invention is in the method f~ producing at least one plastic closure strip having profile and base portions comprising ex~ruding at least a first profile portion, ex~rudin~ at least a first base portion, and joining the first profile and first base portions ~ogether, the improvement wherein the first profile and ~irst base portions are joined together before exiting the die body.
Further embodiments and advantages of the invention will be set forth in part in the following specification and in part will be obvious therefrom without being specifically referred to, the same being realized and attained as pointed out in ~he claims hereof The invention accord~ngly comprisPs the features of construction, combination of elements and arrangement of parts which will be exemplified in the construction hereina~tar set forth and the scope of the application of ~hich will be indicated in the claims.
For a ful~er understanding of the natu~e and objects of the lnvention9 reference should be had to the - ~
' : : 12366 07~.~
fDllowing detailed description, taken in connection with the accompanying drawings, in which:
Fig. l shDws a cross-sectional view Qf two closure strips which form a closure device ~nd which are suitable for being produced by the inventiDn;
Fig. 2 shows a plastie bag incorporating a closure device as shown in Fig. l;
Fig. 3 showc diagrammatic side elevatlonal view of an extrusion system including an apparatus according to the invention;
Fig. 4 is a diagrammatic sectional view of ~n apparatus according to the invention;
Fig. 5 is a diagrammatic par~ial sec~ional view showing another embodiment of an apparatus according to the inventiDn;
Fig. 6 is a perspective view of a control bar used in Fig~ 4;
Fig. 7 is a perspective sectional view Df another control bar used in Fig. 4;
Figs. 8A, 8B, ~nd 8C are sectional views Df different control bars;
Fig. 9 ;s a diagrammatic partial sectional view ~hvwing another embodiment of a flow diverter-~r he appara~us shown in Fig. 4; and 6.
~4Q'7~
Figs. lOA and lOB each shows a cross-sectional view of a combined closure strip produced by an apparatus according to the invention.
In carrying the invention into effect, certain embodiments have been selected for illustration in the accompanying drawings and for description in the specification, reference being had to the Figs. 1 to 10.
Fig. 1 shows a closure device which may be produced in accordance with the instant invention. The profile portion 20 is joined to a base portion 21 and profile portion 22 is joined to base portion 23. The profile portions 20 and 22 are complementary and profile portion 20 can be engaged in the pro~ile portion 22. The two closure strips 25~ and 25B
constitute a closure device.
Fig. 2 shows a typical plastic bag 24 which includes a closure device 26. It has been found economical to produce the two closure strips of the closure device 26 separately and connect them to a film web during the manufacturing of the bag 24.
Thus, it is desirable to have an economical and reliable e~trusion die apparatus for producing the closure strips which constitute closure device 26.
~ 1 4(~7 1 ~ 12366 The closure strips of clDsure device 26 can be made by an extrusiDn system which includes an extrusi~n die apparatus in accordance with the inventiDn as shDwn in Fig. 3. Extruder 27 is cDnnected by a conduit28 to an extrusion die apparatus 29. Extruded closure strips 31 and 32 are produced by the extrusion die apparatus and enter a cooling bath 33, such as a container of water and are then redirected by rollers 34 and 36 to nip rollers 37 where the closure strips 31 and 32 are occluded together to form a continuous closure device 38. The rate at which the continuous cl~sure device 38 is produced depends upon the size and screw speed of the extruder 27, melt flow of the material, the speed of the nip rollers 37, ~he cooling rate, and the adjustment of the die componPnts producing the closure strips 31 and 32 as well as other fact~rs.
Generally, equipment for extruding plastic material is well-known in the art and considerable prior ar~ exis~s relevant to the extrusion of closure devices.
Fi~. 4 shows a partial sectional view of an extrusion die apparatus in accordance with ~he inventi~n and details such as assembly screws, die heaters, sensing e~ntrDl elements, etc. have bee~ omitted for clari~y. The flow diverter 40 establishes the distribution pattern for the plastic material being supplied. PlastiC~mat2rial under pressure is communicated ~o the channels 41 and 42 and ~ O ~ ~ ~ ' 12366 then through the flow diverter 40. Channel 41 is cDnnected to a contrvl orifice 43 and an adjustable valve control 44 before reach;ng contrDl bar 46 and die opening 45. The die opening 45 is an Dutlet and shape controller for a base portiDn.
The channel 42 is connected to channels 42A, 42b and 42c. The channel 42a goes through a control orifice 48 and an adjustable valve control 49 before reaching control bar 51 and di~ opening 52. The die opening 52 is an outlet and shape controller for a closure profile. The die body portiDn 47 between the channels 41 and 42a terminates short of the face of the die body so that the profile and base portions contact each other and join together before exiting frDM the die body to form a closure strip 54.
The apparatus shown in Fig. 4 includes a part for producing another closure strip 68 which is comple-mentary to the closure strip 54.
The channels 42b and 42c pass through control orifices 56 and 57 and adjustable valve controls 58 and 59 and eventually reach control bars 61 and 62. Die opening 63 is an outlet and shape contrDller fDr a profile por~ion 64 and die opening 66 is an outlet and shape controller for a base portion 67. --~ 7 ~ 12366 The profile portion 64 and base portion 67 contact each other and join together befDre exiting the die body tD form closure strip 68 The closure strips 54 and ~8 enter a water bath 69 for cooling the plastic material.
Fig. 5 shows, in part, another embodiment for the extrusion of closure strips. For the embodiment in Fig. 5, the closure strips are reversed as compared to the embodiment shown in Fig. 4. That is, profiles 70 and 71 face each other while the base portions 72 and 73 are on the outside of the closure strips 74 and 76. The difference in the arrangement shown between Fig. 4 and 5 can be achieved by the choice of arrangement of the control bars 46, 51, 61 and 62.
Fig. 6 shows a typical control bar 81 for producing a base portion of a closure strip. A lead-in taper 82, control "land" 83, and recess 84 are factors determining the size and shape of the extruded material.
The control land 83 and recess ~4 are shDwn as being linear, but this is not necessarily the pre~erred embodiment. Generally~ the control land 83 can be either a gentle contour ~x have s~ps of different depths The control land 83 can bP straight in the dir~ction determining width and havP a variable height so that thickness variations can be contrDlled.
~ 0 .
~,~7 12366 ~ 7 ~ ~
The width of the control land 83 depends upon the width of the base portion desired. Mounting holes 86 allow the control bar 81 to be mounted Dr removed conveniently.
Fig. 7 shows a sectional perspectivP view of a control bar 87 for producing a profile portion of a closure strip. A counter bore 88 communicates with a plastic material being supplied under pressure and also co~municates with channel 89 which defines the shape of the prDfile portion. The channel 89 can be formed with goo~ precision through the use of an electrodeposition method in accordance with ~no~n technology. The mounting hole 91 permits the mounting ind removal of the control bar 87.
Figs. 8A, 8~, and 8C show cross-sec~ional views of three control bars having profile channels in different locations. Profile bar 92A shows profile channel 93A
with die opening 94A spaced apar~ from the location of where the diP npening for the base portion would be Sb that the base and profile portions join together outside the die body in accordance with the pri~r art. Control bar 92B
shows profile channel 93B having a die opening 94B which will produce base and profile portions which will join together just before exi~ing the die body because the die body portion 96B is just short of the die ~ace. Control bar 92C includes 11, ~ -J . 12366 114(~171~
a profile channel 93C and a die opening 94C and features a die body portion 96C which is recessed from about 0.010 inch to about 0.250 inch away fxom the face 97C, preferably from about 0.015 inch to about 0.09 inch. The separation between the profile and base channels at the die openings is less than 0.040 inch and preferably about 0.020 inch and more preferably yet from about 0.002 inch to about 0.008 inch. The profile and base portions produced will join together before exiting the die body. The control bar 92C can be used advantageously with a low draw ratio of about 1:4, a high operating speed of about 300 feet per minute, and rapid cooling means such as a water bath.
Cooling can also be established by liquid spray or other known ways.
Fig. 9 shows a partial sectional view of another en~odiment of a flow diverter. Channel 100 supplies plastic material to one base portion extrusion opening whereas channel 101 communicates with channels lOla, lOlb, and lOlc for forming two profile portions as well as one base portion. This arrangement permits the selection of one of the portions as being a different color or composition from the other portions.
Figs. lOA and lOB show two intermediate products which can be extruded from an extrusion die apparatus according to the invention by positioning two profile die openings near a wida ~ase die opening. Cutting base portion 106 ~etween the profile portions lU7 and 108 will produce two closure strips. Similar operations on base portion 109 will produce four closure strips.
` 1~40~ ;; 123~6 It is to be understood that there is no desire for the invention to be limited to the exact details of constructlon shown and described, for obvious modifications will occur to a person skilled in the art.
Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is as follows:
_
Claims (10)
1. An extrusion die apparatus for producing at least one plastic closure strip having profile and base portions, comprising a die body having a die face, at least a first profile channel defined in said die body and communicating with a corresponding first profile die opening in said die face for extruding a first profile portion; and at least a first base channel defined in said die body and communicating with a corresponding first base die opening in said die face for extruding a first base portion; said first profile and first base channels being adjacent to each other near said first profile and first base die openings and separated by a first portion of said die body which terminates from about 0.010 inch to about 0.250 inch short of said die face so that the first profile and first base channels merge within said die body to form a unitary passage at said die face comprising said first profile and first base die openings, whereby the extruded first profile portion and first base portion join together before exiting said die body to thereby form said closure strip.
2. The apparatus of claim 1, further comprising a second profile channel defined in said die body and communi-cating with a corresponding second profile die opening in said die face for extruding a second profile portion; and a second base channel defined in said die body and communicating with a corresponding second base die opening in said die face for extruding a second base portion; said second profile and second base channels being adjacent to each other near said second profile and second base die openings and separated by a second portion of said die body which terminates short of said die face so that the extruded second profile portion and second base portion join together before exiting said die body.
3. The apparatus of claim 2, wherein said first profile and first base portions define a first closure strip and said second profile and second base portions define a second closure strip, said first and second profiles being adapted to be occluded together whereby said first and second closure strips define a closure device.
4. The apparatus of claim 1, wherein said first die body portion terminates from about 0.015 inch to about 0.090 inch short of said die face.
5. The apparatus of claim 1, wherein the separation between said profile and base channels at said die openings is less than about 0.040 inch.
6. The apparatus of claim 1, wherein the separation between said profile and base channels at said die openings is less than about 0.020 inch.
7. The apparatus of claim 1, wherein the separation between said profile and base channels at said die openings is from about 0.002 inch to about 0.008 inch.
8. The apparatus of claim 1, comprising a plurality of separate profile channels defined in said die body and communicating with corresponding profile die openings in said die face for extruding separate profile portions; said plurality of profile channels being adjacent to said first base channel near said die openings and separated by said first portion of said die body so that the extruded plurality of profile portions join said first base portion before all of the portions exit said die body.
9. In the method for producing from a die body at least one plastic closure stirp having profile and base portions, comprising extruding at least a first profile portion, extruding at least a first base portion, and joining the first profile and first base portions together; the improvement wherein said first profile and first base portions are joined together within said die body.
10. The method for producing at least one plastic closure strip having profile and base portions, comprising extruding at least a first profile portion through at least a first profile channel of a die body, extruding at least a first base portion through at least a first base channel of said die body wherein said first profile channel and said first base channel are separated by a portion of said die body, and joining said first profile portion and said first base portion within said die body at a point which terminates from about 0.010 inch to about 0.250 inch short of the die face of said die body.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2566579A | 1979-03-30 | 1979-03-30 | |
| US025,665 | 1979-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1140716A true CA1140716A (en) | 1983-02-08 |
Family
ID=21827383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000348716A Expired CA1140716A (en) | 1979-03-30 | 1980-03-28 | Extruding die apparatus for producing a plastic closure strip |
Country Status (15)
| Country | Link |
|---|---|
| AU (1) | AU540476B2 (en) |
| BE (1) | BE882517A (en) |
| CA (1) | CA1140716A (en) |
| CH (1) | CH636047A5 (en) |
| DE (1) | DE3011371C2 (en) |
| DK (1) | DK157905C (en) |
| FI (1) | FI72918C (en) |
| FR (1) | FR2452371A1 (en) |
| GB (1) | GB2046660B (en) |
| IE (1) | IE49435B1 (en) |
| IT (1) | IT1127017B (en) |
| NL (1) | NL188839C (en) |
| NO (1) | NO154160C (en) |
| NZ (1) | NZ193297A (en) |
| SE (1) | SE435153B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3106023A1 (en) * | 1981-02-19 | 1982-10-14 | Felix 4446 Hörstel Heescher | Process for producing ribbed panels serving as construction elements |
| EP0063189B1 (en) * | 1981-04-16 | 1985-06-19 | The Dow Chemical Company | Method and apparatus for forming an integral closure for a thermoplastic container |
| CA1212808A (en) * | 1982-03-24 | 1986-10-21 | Gerald H. Scheibner | Process and apparatus for reclosable container stock |
| US4515647A (en) * | 1983-02-08 | 1985-05-07 | The Dow Chemical Company | Method and apparatus for forming an integral closure for a thermoplastic container |
| DE3633932C1 (en) * | 1986-10-04 | 1988-05-11 | Caprano & Brunnhofer | Process for producing a plastic profiled bar with connecting strips for a composite profile |
| US4741789A (en) * | 1986-10-20 | 1988-05-03 | The Dow Chemical Company | Apparatus and process for forming and applying a profile and adjacent rib-type zipper to a traveling film web |
| US4822539A (en) * | 1987-09-14 | 1989-04-18 | Minigrip, Inc. | Method of and apparatus for extruding bag making material having fastener profiles and alignment ribs, with reinforcing and stabilizing beam effect ridge means |
| DE3831471A1 (en) * | 1988-09-16 | 1990-03-22 | Friedhelm Houpt | Process for the automatic production of plastic windows |
| DE9419699U1 (en) * | 1994-12-13 | 1995-02-02 | Ortlieb, Hartmut, 90431 Nürnberg | Roll closure for stuff sacks or the like. |
| GB0211478D0 (en) * | 2002-05-18 | 2002-06-26 | Nelson David E | Method and apparatus for the extrusion of material |
| US6877898B2 (en) | 2002-09-05 | 2005-04-12 | Illinois Tool Works Inc. | Ease of closure through tactile/optical means |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB706323A (en) * | 1950-10-13 | 1954-03-31 | Harold Frank Edwin Cirket | Improvements in or relating to the extrusion of plastic materials |
| FR1492413A (en) * | 1965-08-27 | 1967-08-18 | Minigrip Europ As | Process and device for the manufacture of containers provided with a closure device, in particular bags or sachets, in plastic material |
| DE1479151B2 (en) * | 1965-08-27 | 1972-02-17 | Etimex Kunststoffwerke Gmbh, 7000 Stuttgart | EXTRUSION HEAD FOR THE PRODUCTION OF AN OPEN OR TUBE-FITTED PLASTIC WIRE WITH FASTENING RIBS ON ONE SIDE |
| US3579730A (en) * | 1965-10-22 | 1971-05-25 | Steven Ausnit | Apparatus for making a web having integral interlocking rib and groove portions |
| US3371696A (en) * | 1965-10-22 | 1968-03-05 | Ausnit Steven | Reclosable bags with rib and groove elements formed of different materials |
| FR1568124A (en) * | 1968-02-13 | 1969-05-23 | ||
| US3565147A (en) * | 1968-11-27 | 1971-02-23 | Steven Ausnit | Plastic bag having reinforced closure |
| BE785716A (en) * | 1971-06-30 | 1973-01-02 | Flexico France Sarl | MANUFACTURING PROCESS AND EXTRUSION LINE FOR A PLASTIC TUBE |
-
1980
- 1980-03-25 NO NO800864A patent/NO154160C/en unknown
- 1980-03-25 DE DE3011371A patent/DE3011371C2/en not_active Expired
- 1980-03-27 IE IE631/80A patent/IE49435B1/en not_active IP Right Cessation
- 1980-03-27 FI FI800957A patent/FI72918C/en not_active IP Right Cessation
- 1980-03-27 IT IT48276/80A patent/IT1127017B/en active
- 1980-03-27 SE SE8002384A patent/SE435153B/en not_active IP Right Cessation
- 1980-03-28 AU AU56939/80A patent/AU540476B2/en not_active Expired
- 1980-03-28 CA CA000348716A patent/CA1140716A/en not_active Expired
- 1980-03-28 FR FR8006928A patent/FR2452371A1/en active Granted
- 1980-03-28 NL NLAANVRAGE8001859,A patent/NL188839C/en not_active IP Right Cessation
- 1980-03-28 DK DK136280A patent/DK157905C/en not_active IP Right Cessation
- 1980-03-28 NZ NZ193297A patent/NZ193297A/en unknown
- 1980-03-28 BE BE0/200023A patent/BE882517A/en not_active IP Right Cessation
- 1980-03-28 CH CH247680A patent/CH636047A5/en not_active IP Right Cessation
- 1980-03-28 GB GB8010436A patent/GB2046660B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU540476B2 (en) | 1984-11-22 |
| NO800864L (en) | 1980-10-01 |
| DK157905B (en) | 1990-03-05 |
| FI800957A (en) | 1980-10-01 |
| IE800631L (en) | 1980-09-30 |
| IE49435B1 (en) | 1985-10-02 |
| CH636047A5 (en) | 1983-05-13 |
| FI72918B (en) | 1987-04-30 |
| SE435153B (en) | 1984-09-10 |
| NL188839C (en) | 1992-10-16 |
| FR2452371A1 (en) | 1980-10-24 |
| NO154160B (en) | 1986-04-21 |
| SE8002384L (en) | 1980-10-01 |
| GB2046660B (en) | 1983-05-11 |
| BE882517A (en) | 1980-09-29 |
| DE3011371A1 (en) | 1980-10-02 |
| NL188839B (en) | 1992-05-18 |
| NL8001859A (en) | 1980-10-02 |
| FI72918C (en) | 1987-08-10 |
| IT8048276A0 (en) | 1980-03-27 |
| NO154160C (en) | 1986-07-30 |
| IT1127017B (en) | 1986-05-21 |
| DK136280A (en) | 1980-10-01 |
| GB2046660A (en) | 1980-11-19 |
| DK157905C (en) | 1990-08-13 |
| DE3011371C2 (en) | 1985-03-14 |
| NZ193297A (en) | 1984-03-16 |
| AU5693980A (en) | 1980-10-02 |
| FR2452371B1 (en) | 1984-11-23 |
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