CA1304633C - Friction surface for packing foil or like with friction surface - Google Patents
Friction surface for packing foil or like with friction surfaceInfo
- Publication number
- CA1304633C CA1304633C CA000574960A CA574960A CA1304633C CA 1304633 C CA1304633 C CA 1304633C CA 000574960 A CA000574960 A CA 000574960A CA 574960 A CA574960 A CA 574960A CA 1304633 C CA1304633 C CA 1304633C
- Authority
- CA
- Canada
- Prior art keywords
- foil
- friction surface
- friction
- coating
- hot melt
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/42—Applications of coated or impregnated materials
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wrappers (AREA)
- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Abstract The invention relates to a friction surface comprising a conventional foil (1), such as paper or plastic foil, and hot melt bulges (2) and pattern formed by them made on the foil surface by a screening technique. The foil (1) chosen to be used should be such that it is most suitable for the specific package, but the thickness of it should preferably be more than 35 mm and it should at least temporarily endure the heat of about 140 - 180° C, which the hot melt has. The bulges made of hot melt are most advantageously made 50-150 µm high, whereby their ability to adhere to other surfaces is excel-lent. By using filling materials of the hot melts the friction can be increased even more, but in such cases normally thicker basic foil has to be used so as to prevent the foil from tearing. By using a friction surface, considerably high piles of packages can be made. Because the hot melt can be remelted, the top packages can be bound together by spreading any kind of foil on them, which can be attached on the friction surface by heating.
Description
~3~
FRICTION SURFACE FOR PACKING FOIL OR LIKE
WITH FRICTION SURF~CE
The present invention relates to a friction foil of plastics, paper or like material, which is provided with a friction surface on the foil.
Difficulty can be experienced in stacking sheet-wrapped packages which poorly remain on each other and such is often overcome by providing an angular outer package of carton or like strong material, which naturally raises the costs con-siderably.
There have been proposed friction foils which include an adhesive surface but such are expensive, because a substantial area of adhesive is needed. Also, in dusty environments the adhesive surface becomes covered with impurities and dust and loses its good frictional qualities. A packaging foil with an adhesive surface is also difficult to pack and use.
There has also been proposed the spreading of the plastics foil chopped pieces of the same plastics in the production stage which produces, without glue, a friction surface, which has both high friction value and high mechanical strength in different conditions. This type of manufacture is, however, expensive and can be applied only with a very restricted variety of foils. If all the piled packages have this type of foil, it is difficult to bind the packages together even by glueing foil on top of them, because the plastic pieces of the friction foil disturb the attachment of the binding foil.
The main purpose of the invention is to avoid or minimize said disadvantages. The friction surface according to the invention is formed on a foil by a coating having thermo-plastic hot melt spot-like or some other figures made by means of a screening method.
,~$
~L3~~
The coating is preferably transparent or colourless, but it can also be coloured. Hot melt is used 2-15 g/m2, most prefe-rably only about 3 g/m2. The friction foil is usable as a finished product after a short cooling time, and it does not require an evaporation line for any solvents or an expensive method of packing, as do the friction surfaces coated with adhesive material. The product does not have volatile sub-stances, such as solvents of dispersion glue.
The friction foil according to the invention is very economic to produce and therefore it can also be used as the packaging for inexpensive materials, such as large food product pack-ages, fertilizer sacks, timber covers, raw material sacks and bulk material packayes. The piling of food product packages is very difficult without a friction surface, and the products packaged therein may break if they fall. The foil can also be used as an anti-skid device in the transport.
By using the product according to the invention it is possible to prevent, when filling a double-sack, the inner sack from sliding during the filling, and the mouths of both sacks can be glued by reheating the same coating only for a short distance and no pressing is necessary, because the contacting surface is large.
By using the screening method, very small amounts of hot melt can be spread on the foil surface in a controlled manner, whereby the production of a friction surface does not incur great costs.
Because the coating in accordance with the invention is carried out by means of a screening method or like method, it is possible to coat the foil only on required parts, where-by the costs can be further diminished and thus it is also possible to print a text on the same foil after coating the foil with the friction surface. Such is not possible, for :~3~
example, for such friction surfaee, whieh is made by blowing chopped pleces of plastics foil during the produetion stage on the plastics foil. The spreading unit for the hot melt ean operate as a part of a press or as an extension of it, whereby the increase in the production costs to produce the friction surface is considerably small.
The application of a thermoplastic melt on a packaging foil is known as such and disclosed, for example, in Finnish patent publication 71263.
The eoefficient of friction of totally smooth plastics foils of some plastics types is generally high, but even slight impurities, sueh as concrete dust, aggregate dust or pollen dust may reduce the friction coefficient considerably. With the saek packages it is not even possible to produce smooth surface which would be against eaeh other. The frietion at least doubles when a coated foil aceording to the invention is against an uneoated foil, and when two frietion foils are against each other, the total frietion is even higher, and approaching, in the most preferable eonditions, the value of 1.
It is possible to use, for example, eorundum as filling ma-terial of the thermoplastic melt, when the packing foil is thiek, or, for example, ealeium phosphate, magnesium silieate, silieon dioxide or eombination thereof; the filling material is known as sueh from US patent publieation 3,691,120.
The sereening surfaee ean be varied by a known method on the top and bottom surfaees, the total effeet of whieh gives an advantageous binding as a result.
If the paeking foil is sensitive, a form of sereening dot is ehosen which does not break the surfaee of -the foil, for example, hemispherieal dots in a uniformly distributed pat-tern.
The invention will be described further, by way of example, with reference to the accompanying drawirl~, in which:-ig. 1 is a sectional view of a friction foil inaccordance with the invention ig. 2 is a fragmentary plan view of the friction foil of Fig. 1, and ig. 3 is a schematic illustration of the manufacture of the foil according to the invention.
In the drawings, a foil 1 is coated with coating 2 comprising a plurality of conical projections of dots each having a flat top. The dots are provided by means of a screening technique, as illustrated in Fig. 3. A screening roll 3 is provided with cup-like recesses 4 and is partly immerged in a hot melt 6 contained in a vat 5. When the screening roll 3 rotates it raises hot melt from the vat, whereby the melt in the cups ~
is brought into communication with the foil 1 running between a press roll 7 and the screening roll 3, and the melt adheres on the surface of the foil forming a dot-like coating of projections. By means of a scraper 8, any excess hot melt is removed from the surface of the screening roll. The screening cups are dimensioned in such a way that the hot melt forms projections on the foil surface, the height of which pro-jections is about 50-150 ~ m and which form the desired pattern.
E~ample A low density polythene foil, the thickness of which was 0,2 mm, was coated using an apparatus according to Fig. 3 with hot melt mainly consisting of ethyl-vinyl acetate, the viscosity of which was 1000 cP in the temperature of 140 C. The depth ~31~q~3 of the screening cups 4 was 0,12 mm and their diameter 1 mm.
The distance of the dot-like projections from each other was 4 mm. The finished product may be used in the manufacture of sacks.
FRICTION SURFACE FOR PACKING FOIL OR LIKE
WITH FRICTION SURF~CE
The present invention relates to a friction foil of plastics, paper or like material, which is provided with a friction surface on the foil.
Difficulty can be experienced in stacking sheet-wrapped packages which poorly remain on each other and such is often overcome by providing an angular outer package of carton or like strong material, which naturally raises the costs con-siderably.
There have been proposed friction foils which include an adhesive surface but such are expensive, because a substantial area of adhesive is needed. Also, in dusty environments the adhesive surface becomes covered with impurities and dust and loses its good frictional qualities. A packaging foil with an adhesive surface is also difficult to pack and use.
There has also been proposed the spreading of the plastics foil chopped pieces of the same plastics in the production stage which produces, without glue, a friction surface, which has both high friction value and high mechanical strength in different conditions. This type of manufacture is, however, expensive and can be applied only with a very restricted variety of foils. If all the piled packages have this type of foil, it is difficult to bind the packages together even by glueing foil on top of them, because the plastic pieces of the friction foil disturb the attachment of the binding foil.
The main purpose of the invention is to avoid or minimize said disadvantages. The friction surface according to the invention is formed on a foil by a coating having thermo-plastic hot melt spot-like or some other figures made by means of a screening method.
,~$
~L3~~
The coating is preferably transparent or colourless, but it can also be coloured. Hot melt is used 2-15 g/m2, most prefe-rably only about 3 g/m2. The friction foil is usable as a finished product after a short cooling time, and it does not require an evaporation line for any solvents or an expensive method of packing, as do the friction surfaces coated with adhesive material. The product does not have volatile sub-stances, such as solvents of dispersion glue.
The friction foil according to the invention is very economic to produce and therefore it can also be used as the packaging for inexpensive materials, such as large food product pack-ages, fertilizer sacks, timber covers, raw material sacks and bulk material packayes. The piling of food product packages is very difficult without a friction surface, and the products packaged therein may break if they fall. The foil can also be used as an anti-skid device in the transport.
By using the product according to the invention it is possible to prevent, when filling a double-sack, the inner sack from sliding during the filling, and the mouths of both sacks can be glued by reheating the same coating only for a short distance and no pressing is necessary, because the contacting surface is large.
By using the screening method, very small amounts of hot melt can be spread on the foil surface in a controlled manner, whereby the production of a friction surface does not incur great costs.
Because the coating in accordance with the invention is carried out by means of a screening method or like method, it is possible to coat the foil only on required parts, where-by the costs can be further diminished and thus it is also possible to print a text on the same foil after coating the foil with the friction surface. Such is not possible, for :~3~
example, for such friction surfaee, whieh is made by blowing chopped pleces of plastics foil during the produetion stage on the plastics foil. The spreading unit for the hot melt ean operate as a part of a press or as an extension of it, whereby the increase in the production costs to produce the friction surface is considerably small.
The application of a thermoplastic melt on a packaging foil is known as such and disclosed, for example, in Finnish patent publication 71263.
The eoefficient of friction of totally smooth plastics foils of some plastics types is generally high, but even slight impurities, sueh as concrete dust, aggregate dust or pollen dust may reduce the friction coefficient considerably. With the saek packages it is not even possible to produce smooth surface which would be against eaeh other. The frietion at least doubles when a coated foil aceording to the invention is against an uneoated foil, and when two frietion foils are against each other, the total frietion is even higher, and approaching, in the most preferable eonditions, the value of 1.
It is possible to use, for example, eorundum as filling ma-terial of the thermoplastic melt, when the packing foil is thiek, or, for example, ealeium phosphate, magnesium silieate, silieon dioxide or eombination thereof; the filling material is known as sueh from US patent publieation 3,691,120.
The sereening surfaee ean be varied by a known method on the top and bottom surfaees, the total effeet of whieh gives an advantageous binding as a result.
If the paeking foil is sensitive, a form of sereening dot is ehosen which does not break the surfaee of -the foil, for example, hemispherieal dots in a uniformly distributed pat-tern.
The invention will be described further, by way of example, with reference to the accompanying drawirl~, in which:-ig. 1 is a sectional view of a friction foil inaccordance with the invention ig. 2 is a fragmentary plan view of the friction foil of Fig. 1, and ig. 3 is a schematic illustration of the manufacture of the foil according to the invention.
In the drawings, a foil 1 is coated with coating 2 comprising a plurality of conical projections of dots each having a flat top. The dots are provided by means of a screening technique, as illustrated in Fig. 3. A screening roll 3 is provided with cup-like recesses 4 and is partly immerged in a hot melt 6 contained in a vat 5. When the screening roll 3 rotates it raises hot melt from the vat, whereby the melt in the cups ~
is brought into communication with the foil 1 running between a press roll 7 and the screening roll 3, and the melt adheres on the surface of the foil forming a dot-like coating of projections. By means of a scraper 8, any excess hot melt is removed from the surface of the screening roll. The screening cups are dimensioned in such a way that the hot melt forms projections on the foil surface, the height of which pro-jections is about 50-150 ~ m and which form the desired pattern.
E~ample A low density polythene foil, the thickness of which was 0,2 mm, was coated using an apparatus according to Fig. 3 with hot melt mainly consisting of ethyl-vinyl acetate, the viscosity of which was 1000 cP in the temperature of 140 C. The depth ~31~q~3 of the screening cups 4 was 0,12 mm and their diameter 1 mm.
The distance of the dot-like projections from each other was 4 mm. The finished product may be used in the manufacture of sacks.
Claims (8)
1. A friction surface such as a foil made of plastics, paper or other sheet or other material, having a friction surface on the foil, characterized in that a coating of dot-like projections, or projections of other shape, is provided formed from a thermoplastic hot melt on that part or those parts of the foil requiring improved friction.
2. A friction surface according to claim 1, characterized in that the coating is either transparent or colourless.
3. A friction surface according to claim 1, characterized in that the coating is coloured.
4. A friction surface according to claim 1, 2 or 3 characterized in that the coating is in the form of a plurality of dot-like projections, the height of which is 50-150 µm.
5. A friction surface according to claim 4, characterized in that the coating is formed of a plurality of dot-like projections with a form of truncated pyramids.
6. A friction surface according to one of claims 1, 2 or 3, characterized in that the square weight of the coating is 2-15 g/m2.
7. A friction surface as claimed in one of claims 1, 2 or 3, characterized in that the coating of projections is provided by using a screening technique.
8. A method of increasing the frictional characteristics of a surface, such as a foil, comprises applying a coating of thermoplastic material from a hot melt, using a screen or other technique, to that part or those parts of the surface requiring increased frictional characteristics.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI873577A FI82820C (en) | 1987-08-18 | 1987-08-18 | FRIKTIONSYTA FOER FOERPACKNINGSFOLIE ELLER ANNAN YTA. |
| FI873577 | 1987-08-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1304633C true CA1304633C (en) | 1992-07-07 |
Family
ID=8524909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000574960A Expired - Fee Related CA1304633C (en) | 1987-08-18 | 1988-08-17 | Friction surface for packing foil or like with friction surface |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP0304255A3 (en) |
| JP (2) | JPH02501630A (en) |
| KR (1) | KR920010542B1 (en) |
| CN (1) | CN1031979A (en) |
| AU (1) | AU605630B2 (en) |
| CA (1) | CA1304633C (en) |
| DK (1) | DK42690D0 (en) |
| FI (1) | FI82820C (en) |
| IN (1) | IN171719B (en) |
| NZ (1) | NZ225857A (en) |
| PT (1) | PT88290A (en) |
| WO (1) | WO1989001446A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI109346B (en) * | 1997-06-30 | 2002-07-15 | Upm Kymmene Oyj | Roofing materials |
| US6591838B2 (en) * | 1998-07-06 | 2003-07-15 | Scimed Life Systems, Inc. | Implant system and method for bulking tissue |
| US20050092636A1 (en) * | 2003-10-31 | 2005-05-05 | Wu Su-Syin | Sterilization packaging |
| FR3007045B1 (en) * | 2013-06-12 | 2015-09-04 | Endupack | NON-SLIP SHEET |
| HUP1600341A2 (en) * | 2016-05-26 | 2017-11-28 | Flexinnova Kft | Antislip flexible materials and methods for their making and use |
| HUP1600340A2 (en) | 2016-05-26 | 2017-11-28 | Flexinnova Kft | Antislip, heat sealable plastic flexible packaging bag and method and apparatus for its production |
| CN107021284A (en) * | 2017-04-14 | 2017-08-08 | 合肥悦兰信息技术有限公司 | A kind of medicine equipment vacuum packaging bag |
| CN111378307B (en) * | 2020-04-28 | 2022-05-06 | 邦弗特新材料股份有限公司 | UV coating with special bump structure and preparation method thereof |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2917223A (en) * | 1955-10-19 | 1959-12-15 | Cromwell Paper Co | Non-slip bag |
| CH471009A (en) * | 1967-03-16 | 1969-04-15 | Achermann W | Anti-slip aids for objects lying on top of one another or next to one another, especially for packaging that is to be transported and stored in a stack, such as boxes, etc. |
| FR2080004A5 (en) * | 1970-02-19 | 1971-11-12 | Johnson & Johnson | Thermoplastic film or sheet with ribs for - container production |
| DE2008687A1 (en) * | 1970-02-25 | 1971-09-09 | Schlayer Polydress GmbH, 7410 Reut hngen | Non-slip plastic foils |
| DE2043418A1 (en) * | 1970-09-02 | 1972-03-16 | Marburger Tapetenfabrik J.B. Schäefer GmbH &Co KG, 3570 Kirchhain | Plastics strip material - with embossed pattern of foamed plastic on one or both faces |
| SE413077B (en) * | 1976-09-10 | 1980-04-14 | Kraft Pak Ab | PREPARATION OF DRAWING PACKAGING WITH STRENGTH SURFACE BY LINKING A PLASTIC COAT AND A PAPER COAT |
| FI66152C (en) * | 1977-03-21 | 1984-09-10 | Wiik & Hoeglund | METHOD FOER ATT GOERA FOERPACKNINGAR HALKFRIA |
| US4253562A (en) * | 1979-07-23 | 1981-03-03 | Vandenberg John D | Display packaging for soft merchandise |
| CA1186863A (en) * | 1981-04-21 | 1985-05-14 | Jarl-Erik Jofs | Non-slip plastic film |
| JPS5815497A (en) * | 1981-07-21 | 1983-01-28 | Sharp Corp | Driving of pulse motor |
| JPS6051871A (en) * | 1983-08-31 | 1985-03-23 | Canon Inc | Image forming device |
| SE451019B (en) * | 1984-06-06 | 1987-08-24 | Icopal Ab | Plastic sheet with slip protection |
-
1987
- 1987-08-18 FI FI873577A patent/FI82820C/en not_active IP Right Cessation
-
1988
- 1988-08-11 IN IN575/MAS/88A patent/IN171719B/en unknown
- 1988-08-12 KR KR1019890700654A patent/KR920010542B1/en not_active IP Right Cessation
- 1988-08-12 JP JP63506888A patent/JPH02501630A/en active Pending
- 1988-08-12 AU AU22699/88A patent/AU605630B2/en not_active Ceased
- 1988-08-12 WO PCT/FI1988/000129 patent/WO1989001446A1/en unknown
- 1988-08-15 EP EP88307542A patent/EP0304255A3/en not_active Withdrawn
- 1988-08-17 NZ NZ225857A patent/NZ225857A/en unknown
- 1988-08-17 CA CA000574960A patent/CA1304633C/en not_active Expired - Fee Related
- 1988-08-18 CN CN88106695A patent/CN1031979A/en active Pending
- 1988-08-18 PT PT88290A patent/PT88290A/en not_active Application Discontinuation
-
1990
- 1990-02-16 DK DK042690A patent/DK42690D0/en not_active Application Discontinuation
-
1993
- 1993-09-03 JP JP048085U patent/JPH07865U/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FI82820B (en) | 1991-01-15 |
| IN171719B (en) | 1992-12-19 |
| FI873577A0 (en) | 1987-08-18 |
| EP0304255A2 (en) | 1989-02-22 |
| DK42690A (en) | 1990-02-16 |
| PT88290A (en) | 1989-06-30 |
| JPH07865U (en) | 1995-01-06 |
| AU605630B2 (en) | 1991-01-17 |
| KR890701444A (en) | 1989-12-20 |
| FI82820C (en) | 1991-04-25 |
| CN1031979A (en) | 1989-03-29 |
| KR920010542B1 (en) | 1992-12-05 |
| WO1989001446A1 (en) | 1989-02-23 |
| NZ225857A (en) | 1990-11-27 |
| FI873577A (en) | 1989-02-19 |
| DK42690D0 (en) | 1990-02-16 |
| EP0304255A3 (en) | 1990-01-31 |
| AU2269988A (en) | 1989-03-09 |
| JPH02501630A (en) | 1990-06-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |