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

Definitions

• the present invention relates to a friction foil of plastics, paper or like material, which is provided with a friction surface on the foil.
• friction foils which include an adhesive surface but ⁇ uch are expensive, because a substantial area of adhesive i ⁇ 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 i ⁇ also difficult to pack and use.
• the friction ⁇ urface according to the invention i ⁇ 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.
• the coating is preferably transparent or colourless, but it
• Hot melt is used 2-15 g/m , most prefe-
• the friction foil i ⁇ usable a ⁇ a finished product after a short cooling time, and it doe ⁇ not require an evaporation line for any solvents or an expensive method of - packing, a ⁇ 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 a ⁇ the packaging for inexpensive materials, such a ⁇ large food product pack ⁇ ages, fertilizer sack ⁇ , timber covers, raw material ⁇ ack ⁇ and bulk material package ⁇ .
• the piling of food product packages is very difficult without a friction ⁇ urface, and the products packaged therein may break if they fall.
• the foil can al ⁇ o be used as an anti-skid device in the tran ⁇ port.
• 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 cn required parts, where ⁇ by the costs can be further diminished and thus it i ⁇ al ⁇ o possible to print a text on the same foil after coating the foil with the friction ⁇ urface.
• Such i ⁇ not po ⁇ sible, for example, for such friction surface which is made by blowing chopped pieces of plastic ⁇ foil during the production ⁇ tage on the pla ⁇ tic ⁇ foil.
• the ⁇ preading unit for the hot melt can operate as a part of a press or as an extension of it, whereby the increase in the production costs to produce the friction ⁇ urface is considerably small.
• thermoplastic melt on a packaging foil i ⁇ known as ⁇ uch and disclosed, for example, in Finnish patent publication 71263.
• the coefficient of friction of totally smooth pla ⁇ tic ⁇ foils of some plastic ⁇ type ⁇ i ⁇ generally high, but even slight impurities, such as concrete dust, aggregate dust or pollen dust may reduce the friction coefficient considerably. With the sack packages it is not even po ⁇ ible to produce smooth surface which would be against each other.
• the screening surface can be varied by a known method on the top and bottom surface ⁇ , the total effect of which give ⁇ an advantageous binding a ⁇ a result.
• Fig. 1 is a sectional view of a friction foil in accordance with the invention
• Fig. 2 is a fragmentary plan view of the friction foil of Fig. 1, and
• Fig. 3 is a schematic illustration of the manufacture of the foil according to the invention.
• a foil 1 i ⁇ coated with coating 2 comprising a plurality of conical projections of dot ⁇ each having a flat top.
• the dots are provided by means of a ⁇ creening technique, a ⁇ illustrated in Fig. 3.
• a screening roll 3 i ⁇ provided with cup-like rece ⁇ ses 4 and is partly immergec in a hot melt 6 contained in a vat 5.
• the screening roll 3 rotates it rai ⁇ e ⁇ hot melt from the vat, whereby the melt in the cup ⁇ 4 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.
• any excess hot melt is removed from the ⁇ urface of the screening roll.
• the ⁇ creening cup ⁇ are dimen ⁇ ioned in ⁇ uch a way that the hot melt forms projections on the foil surface, the height of which pro ⁇ jections i ⁇ about 50-150 y m and which form the de ⁇ ired patter .
• the finished product may be used in the manufacture of sack ⁇ .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wrappers (AREA)
• Laminated Bodies (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8524909

Family Applications (1)

Country Status (12)

Cited By (4)

Families Citing this family (5)

Citations (6)

Family Cites Families (6)

• 1987
  • 1987-08-18 FI FI873577A patent/FI82820C/fi not_active IP Right Cessation
• 1988
  • 1988-08-11 IN IN575/MAS/88A patent/IN171719B/en unknown
  • 1988-08-12 WO PCT/FI1988/000129 patent/WO1989001446A1/en unknown
  • 1988-08-12 JP JP63506888A patent/JPH02501630A/ja active Pending
  • 1988-08-12 AU AU22699/88A patent/AU605630B2/en not_active Ceased
  • 1988-08-12 KR KR1019890700654A patent/KR920010542B1/ko not_active Expired
  • 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 PT PT88290A patent/PT88290A/pt not_active Application Discontinuation
  • 1988-08-18 CN CN88106695A patent/CN1031979A/zh active Pending
• 1990
  • 1990-02-16 DK DK042690A patent/DK42690D0/da not_active Application Discontinuation
• 1993
  • 1993-09-03 JP JP048085U patent/JPH07865U/ja active Pending

Patent Citations (6)

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