CA1131868A - Process for producing plastic foil - Google Patents
Process for producing plastic foilInfo
- Publication number
- CA1131868A CA1131868A CA338,458A CA338458A CA1131868A CA 1131868 A CA1131868 A CA 1131868A CA 338458 A CA338458 A CA 338458A CA 1131868 A CA1131868 A CA 1131868A
- Authority
- CA
- Canada
- Prior art keywords
- surface layer
- foil
- plastic material
- extrusion
- foils
- 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
- 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
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
- B29C48/336—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles the components merging one by one down streams in the 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
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- 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
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
- B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
- B29C48/147—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle
- B29C48/1472—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration after the die nozzle at the die nozzle exit zone
-
- 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
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- 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
- B29C2791/00—Shaping characteristics in general
- B29C2791/004—Shaping under special conditions
- B29C2791/007—Using fluid under pressure
-
- 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
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0072—Roughness, e.g. anti-slip
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/003—Tubular articles having irregular or rough surfaces
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Abstract The invention relates to a process for producing foils or films of plastic material with increased sur-face friction. According to the invention, two or more foils are extruded, laminated and stretched together, the supply of material to the extrusion of the foil or foils which are to form the surface layer being con-trolled in such a way that the amount of plastic mate-rial is insufficient to form a coherent layer when the laminated foil is stretched. In this way the surface layer will break at stretching and give a rough surface with an increased surface friction.
:
:
Description
~3~
Thls invention relates to a method of making plastic films or foils with increased surface friction.
Films and foils of plastic material, especially polyole-fins such as polyethylene, have been widely used in many fields.
One of the most important fields is the packing industry. These films and foils have several suitable proper-ties,among others, that they are stretchable but have a good strength, that they are insensitive to the influence of water and other liquids, and that they can readily be heat welded.
10In conventional manufacture of plastic film or foil by ex trusion, the finished foil or film will mostly have a very smooth and glossy surface. For most plastic materials, especially polyo-lefins, this means that the surface of the foil has a very low friction, partlcularly when two foils of the same kind are rubbed against each other. For certain applications, e.g. in automatic ; packing machinery, this can be an advantage, but in many other cases the low friction is a serious disadvantage. For example, when filled sacks of polyethylene foil are stacked, there is a great risk that the stack may fall, as the frictinn between the sacks is low. This involves risks of serious accidents.
Attempts have already been made to master this problem by laminating a plastic foil with one or more other foils of such a material or of such a design that the surface friction is in-. creased. Thus, it is known, for example, from US patent 4 045 270 to blow extrude a laminated tube, where the main foil ofpolyethylene is provided on one or both sides with a layer of a plastic material which has been made porous by m~ans of an , ~
:, .~ .
~3~ 3 `ded blowing a~ent. At the blowing and stretching of the tube after the extrusion, the porous plastic layer will be stretched so that the cells in the materia] will brea~. In this way, a coarse, net-like surface will be obtained having a considerably increased friction.
Although the plastic foil produced in this way has a suit- ' ably increased surface friction, it has thle disad~antage, how-ever, that it requires an addition of blowing agent. Such blow-ing agents are not always physiologically acceptable and may make the use of ~he foil impossible in the food industry, where there must be a complete safety against foreign and injurious materials migrating from the packing material to the packed foodstuff.
The disadvantage indicated above is eliminated by the present invention and a plastic foil with increased surface friction is obtained which does not contain any foreign addi-tives.
According to one aspect of the present invention, this object is achieved by preparing a plastic foil or film by ex-Z~ trusion, lamination and stretching of two or more foils orfilms of thermoplastic material continuously bonded to each other, the dosage of plastic material to the foil or foils forming the outer layer or layers being controlled in the ex trusion operation in such a way that the added amount of plastic material is insufficient to form a coherent layer after the stretching.
The extrusion is preferably carried out as extrusion blow-~ .
l - 2 -\~
.~ ' .
"
~3l3~l8~
ing of a lamin~ted tube through two or more concentric slit nozzles and a subse~uent blowing and stretching o~ the hose.
Due to this, the outer layer will crack at the , . ' ~
'' .
- ., ": .
3 ~3~
stretchlng and ~orm a rough sur~eace so that the surface friction is increased in the finished Eoll.
B~IEF D~SCRIPTION OF TEIE INVE`~TION
-The E`lyure i~s a sectional view of an extrusion head wherein a plastic tube foil is being prepaxed.
An example of how the invention is carrled out is shown in the drawing. Here a sectional view of an extrusion head 1 with two annular, concentric slit dies 2 and 3 is shown schematically.
A plastic compound 4, which is plasticized by heat, is led from a conventional extruder (not shown) through the inner die 3 and is extruded to the tube foil 5. A plastic compound 6 is led from an extruder with a controlled dosage (not shown) to the slit die 2.
As the added amount of the plastic compound 6 is too small to form a coherent layer when the extruded tube is blown out and stretched by the air bubble indicated by 8, the outer layer will crack and give local deposits 7 of the plastic material. In this way r a rough surface will be obtained.
After the inflation and stretching operation, the pro-duced laminated foil is further treated in a completely conventional way. Thus, it can be rolled up as a tube and be transported as a roll to its final use.
Of course, it is also possible to use three concentric slit dies and to control -the supply of plastic compound to the innermost and outermost die in the way indicated above. l'he result - 25 of this will be an increased sur-face friction on both sides of the ~oil.
The controlling of the suppl~ of plastic material to the extruder die or dies forming the layer which increases the friction can be carried out in such a way that the added amount is too small " ~
, .
BI~
-to obtain a coherent layer after the stretching so that the layer -thus breaks. It is also possible -to control the supply in such a way that it is made intermittent. This will ~rovide a more markedly rou~3h surface on the Eoil. Moreover, fillers or fibers giving this plastic material inferior flowing prope~ties and, consequently, increasing the surface roughness of the finished foil can also be added to the starting material of the foil or foils formin~ the outer layers. Such fillers are known to those skilled in the art.
~s a plastic material for the foil any thermoplastic material can be used which is conventionally usable for extrusion of foils. Polyolefins are especially suitable and primarily the use of polyethylene is contemplated. The plastic material or materials forming the friction increasing surface layer can often be the same as the plastic material forming the main foil.
However, this is not obsolutely necessary, but other plastic ` materials can also be used, provided that they can be laminated with the main ~oil material.
The extruders are of the type known to those skilled in the art and the adjustment of the extruder providing a controlled dosage can be easily established on the basis of simple preliminary testsO The extrusion is carried out in conventional manner also in other respects.
The process of the invention has been described in the foregoing with reference to extrusion blowing of a tube, which is a preferred embodiment. However, it is to be noted that the advant-ages of the invention can also be obtained in the extrusion of foils . ; ~
5 ~3~
i through straiynt slit dies and a subsequent lamination and s-tretchin~. By a controlled dosage to the extrusion nozz:Le providlny the sur-~ace layer, it is also here achieved that the surface layer will contain an insufficlent quant:ity of material to give a coherent layer after stretchiny, and will instead crack and give a rough surface. Asper.ities may also here be ~ormed on both sides of the foil.
A foil or film of plastic material showing a high surface friction without the necessity of adding any foreign, expensive and toxic materials is produced according to the present invention.
The prepared foil material can, therefore, be used for packing of foodstuffs and other sensitive materials without any risks. This means considerable technical advantages and also increased safety.
Thls invention relates to a method of making plastic films or foils with increased surface friction.
Films and foils of plastic material, especially polyole-fins such as polyethylene, have been widely used in many fields.
One of the most important fields is the packing industry. These films and foils have several suitable proper-ties,among others, that they are stretchable but have a good strength, that they are insensitive to the influence of water and other liquids, and that they can readily be heat welded.
10In conventional manufacture of plastic film or foil by ex trusion, the finished foil or film will mostly have a very smooth and glossy surface. For most plastic materials, especially polyo-lefins, this means that the surface of the foil has a very low friction, partlcularly when two foils of the same kind are rubbed against each other. For certain applications, e.g. in automatic ; packing machinery, this can be an advantage, but in many other cases the low friction is a serious disadvantage. For example, when filled sacks of polyethylene foil are stacked, there is a great risk that the stack may fall, as the frictinn between the sacks is low. This involves risks of serious accidents.
Attempts have already been made to master this problem by laminating a plastic foil with one or more other foils of such a material or of such a design that the surface friction is in-. creased. Thus, it is known, for example, from US patent 4 045 270 to blow extrude a laminated tube, where the main foil ofpolyethylene is provided on one or both sides with a layer of a plastic material which has been made porous by m~ans of an , ~
:, .~ .
~3~ 3 `ded blowing a~ent. At the blowing and stretching of the tube after the extrusion, the porous plastic layer will be stretched so that the cells in the materia] will brea~. In this way, a coarse, net-like surface will be obtained having a considerably increased friction.
Although the plastic foil produced in this way has a suit- ' ably increased surface friction, it has thle disad~antage, how-ever, that it requires an addition of blowing agent. Such blow-ing agents are not always physiologically acceptable and may make the use of ~he foil impossible in the food industry, where there must be a complete safety against foreign and injurious materials migrating from the packing material to the packed foodstuff.
The disadvantage indicated above is eliminated by the present invention and a plastic foil with increased surface friction is obtained which does not contain any foreign addi-tives.
According to one aspect of the present invention, this object is achieved by preparing a plastic foil or film by ex-Z~ trusion, lamination and stretching of two or more foils orfilms of thermoplastic material continuously bonded to each other, the dosage of plastic material to the foil or foils forming the outer layer or layers being controlled in the ex trusion operation in such a way that the added amount of plastic material is insufficient to form a coherent layer after the stretching.
The extrusion is preferably carried out as extrusion blow-~ .
l - 2 -\~
.~ ' .
"
~3l3~l8~
ing of a lamin~ted tube through two or more concentric slit nozzles and a subse~uent blowing and stretching o~ the hose.
Due to this, the outer layer will crack at the , . ' ~
'' .
- ., ": .
3 ~3~
stretchlng and ~orm a rough sur~eace so that the surface friction is increased in the finished Eoll.
B~IEF D~SCRIPTION OF TEIE INVE`~TION
-The E`lyure i~s a sectional view of an extrusion head wherein a plastic tube foil is being prepaxed.
An example of how the invention is carrled out is shown in the drawing. Here a sectional view of an extrusion head 1 with two annular, concentric slit dies 2 and 3 is shown schematically.
A plastic compound 4, which is plasticized by heat, is led from a conventional extruder (not shown) through the inner die 3 and is extruded to the tube foil 5. A plastic compound 6 is led from an extruder with a controlled dosage (not shown) to the slit die 2.
As the added amount of the plastic compound 6 is too small to form a coherent layer when the extruded tube is blown out and stretched by the air bubble indicated by 8, the outer layer will crack and give local deposits 7 of the plastic material. In this way r a rough surface will be obtained.
After the inflation and stretching operation, the pro-duced laminated foil is further treated in a completely conventional way. Thus, it can be rolled up as a tube and be transported as a roll to its final use.
Of course, it is also possible to use three concentric slit dies and to control -the supply of plastic compound to the innermost and outermost die in the way indicated above. l'he result - 25 of this will be an increased sur-face friction on both sides of the ~oil.
The controlling of the suppl~ of plastic material to the extruder die or dies forming the layer which increases the friction can be carried out in such a way that the added amount is too small " ~
, .
BI~
-to obtain a coherent layer after the stretching so that the layer -thus breaks. It is also possible -to control the supply in such a way that it is made intermittent. This will ~rovide a more markedly rou~3h surface on the Eoil. Moreover, fillers or fibers giving this plastic material inferior flowing prope~ties and, consequently, increasing the surface roughness of the finished foil can also be added to the starting material of the foil or foils formin~ the outer layers. Such fillers are known to those skilled in the art.
~s a plastic material for the foil any thermoplastic material can be used which is conventionally usable for extrusion of foils. Polyolefins are especially suitable and primarily the use of polyethylene is contemplated. The plastic material or materials forming the friction increasing surface layer can often be the same as the plastic material forming the main foil.
However, this is not obsolutely necessary, but other plastic ` materials can also be used, provided that they can be laminated with the main ~oil material.
The extruders are of the type known to those skilled in the art and the adjustment of the extruder providing a controlled dosage can be easily established on the basis of simple preliminary testsO The extrusion is carried out in conventional manner also in other respects.
The process of the invention has been described in the foregoing with reference to extrusion blowing of a tube, which is a preferred embodiment. However, it is to be noted that the advant-ages of the invention can also be obtained in the extrusion of foils . ; ~
5 ~3~
i through straiynt slit dies and a subsequent lamination and s-tretchin~. By a controlled dosage to the extrusion nozz:Le providlny the sur-~ace layer, it is also here achieved that the surface layer will contain an insufficlent quant:ity of material to give a coherent layer after stretchiny, and will instead crack and give a rough surface. Asper.ities may also here be ~ormed on both sides of the foil.
A foil or film of plastic material showing a high surface friction without the necessity of adding any foreign, expensive and toxic materials is produced according to the present invention.
The prepared foil material can, therefore, be used for packing of foodstuffs and other sensitive materials without any risks. This means considerable technical advantages and also increased safety.
Claims (11)
1. A process for producing a foil or film of plastic material with increased surface friction by extrusion, lamination and stretching of two or more foils of thermoplastic materials, characterized in that the dosage of plastic material to the foil or foils or films which are to form the surface layer or layers in the extrusion process is controlled in such a way that the amount of plastic material is insufficient to form a coherent layer after the stretching process.
2. The process as claimed in claim 1, characterized in that the extrusion is carried out as extrusion flowing of a laminated tube through two or more concentric slit dies and a subsequent inflation and stretching of the tube.
3. The process as claimed in claim 1 or 2, characterized in that the dosage of plastic material to the surface layer or layers is controlled in such a way that it is intermittent.
4. The process as claimed in Claim 1, characterized in that the fillers or fibers reducing the flowability of the plas-tic material or materials which are to form the surface layer or layers.
5. The process as claimed in claim 1, characterized in that the plastic material forming the surface layer is the same as the plastic material .. _ . . .... .
forming the main foil.
forming the main foil.
6. The process as claimed in Claim 1 characterized in that the plastic material consists of polyolefin.
7. The process as claimed in Claim 4 characterized in that the poleolefin is polyethylene.
8. A process for producing a foil or film of plastic material with increased surface friction comprising extruding at least two foils of thermoplastic material to form a laminate having at least one surface layer and a main foil, said at least one surface layer being completely laminated to said main foil, and cracking said at least one surface layer by extruding an amount of thermoplastic material used to form said at least one surface layer which is insufficient to maintain a coherent surface layer upon stretching of said laminate.
9. The process of Claim 8 wherein said extrusion is carried out as extrusion blowing of a laminated tube through two or more concentric slit dies.
10. The process of Claim 8 wherein the thermoplastic material used to form said at least one surface layer is extruded intermittently.
11. The process of Claim 8 wherein the thermoplastic material forming the surface layer of surface layers is the same thermoplastic material forming the main foil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7811311A SE414604B (en) | 1978-11-01 | 1978-11-01 | SET TO MAKE FILM OR FILM OF PLASTIC MATERIAL WITH INCREASED SURFACE |
| SE7811311-5 | 1978-11-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1131868A true CA1131868A (en) | 1982-09-21 |
Family
ID=20336236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA338,458A Expired CA1131868A (en) | 1978-11-01 | 1979-10-25 | Process for producing plastic foil |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT368439B (en) |
| CA (1) | CA1131868A (en) |
| CH (1) | CH652645A5 (en) |
| DE (1) | DE2953283C1 (en) |
| FI (1) | FI69776B (en) |
| GB (1) | GB2043527B (en) |
| SE (1) | SE414604B (en) |
| WO (1) | WO1980000936A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011012910A3 (en) * | 2009-07-28 | 2011-03-24 | George Lagouderis | Thermoplastic film with flexible reinforcements, machine and method of its production |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2124549B (en) * | 1982-05-20 | 1986-11-05 | Intercontinental Plastics Inc | Plastics film and bags and sacks therefrom |
| FR2751913B1 (en) * | 1996-08-02 | 1998-10-30 | Mesnel | METHOD AND DEVICE FOR MANUFACTURING BY EXTRUSION OF A PROFILE WITH LOCALLY VARIABLE SECTION, AND PROFILE THUS PRODUCED |
| CN1213848C (en) * | 1997-02-05 | 2005-08-10 | 老约瑟夫·曼德兹苏 | Process of roughening thermoplastic films and roughed plastic films |
| US7775716B2 (en) | 2004-05-26 | 2010-08-17 | Kee Plastics Ab | Piping bag, blank for manufacturing a piping bag and method of manufacturing a piping bag |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI63344C (en) * | 1975-04-28 | 1988-05-03 | Wiik & Hoeglund | FOER FARING FOR FRAMING OF PLASTIC PLASTICS. |
-
1978
- 1978-11-01 SE SE7811311A patent/SE414604B/en unknown
-
1979
- 1979-10-19 FI FI793258A patent/FI69776B/en not_active Application Discontinuation
- 1979-10-25 CA CA338,458A patent/CA1131868A/en not_active Expired
- 1979-10-31 WO PCT/SE1979/000221 patent/WO1980000936A1/en unknown
- 1979-10-31 DE DE2953283A patent/DE2953283C1/en not_active Expired
- 1979-10-31 CH CH5229/80A patent/CH652645A5/en not_active IP Right Cessation
- 1979-10-31 AT AT0903979A patent/AT368439B/en not_active IP Right Cessation
- 1979-10-31 GB GB8020454A patent/GB2043527B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011012910A3 (en) * | 2009-07-28 | 2011-03-24 | George Lagouderis | Thermoplastic film with flexible reinforcements, machine and method of its production |
Also Published As
| Publication number | Publication date |
|---|---|
| SE414604B (en) | 1980-08-11 |
| FI793258A (en) | 1980-05-02 |
| CH652645A5 (en) | 1985-11-29 |
| AT368439B (en) | 1982-10-11 |
| GB2043527A (en) | 1980-10-08 |
| ATA903979A (en) | 1982-02-15 |
| FI69776B (en) | 1985-12-31 |
| DE2953283C1 (en) | 1985-02-28 |
| GB2043527B (en) | 1982-10-06 |
| SE7811311L (en) | 1980-05-02 |
| DE2953283A1 (en) | 1980-12-18 |
| WO1980000936A1 (en) | 1980-05-15 |
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| MKEX | Expiry |
Effective date: 19990921 |