Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
  • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
  • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
  • B05C1/10—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the liquid or other fluent material being supplied from inside the roller
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
  • B31B70/00—Making flexible containers, e.g. envelopes or bags
  • B31B70/60—Uniting opposed surfaces or edges; Taping
  • B31B70/62—Uniting opposed surfaces or edges; Taping by adhesives

Definitions

• the present invention relates to a device for spread ⁇ ing jointing adhesive on a paper surface, said device comprising a rotatable adhesive spreading roll, norm ⁇ ally closed nozzles on the periphery of said spread ⁇ ing roll, said nozzles being connected via closed adhesive supply passages to an adhesive supply means and the shut-off means of said nozzles being adapted to open by the action of an external pressure while the spreading roll is rotating.
• a device of this type is disclosed in FI Patent public ⁇ ation 49779. It proposes the use of one or more para- lel adhesive spreading rolls for applying glue seams or joints e.g. to the surface of a cardboard web, whereafter such cardboard web can be obviously used e.g. for fabrication of packaging boxes.
• the prior art jointing adhesive spreading devices used for the fabrication of multi-layer paper sacks employ open adhesive troughs or gutters from which the adhesive is transferred. through scraper-equipped arrays of rolls onto an actaul adhesive spreading roll. Such assembly involves, however, several drawbacks. In open adhesive gutters, the adhesive sets and toxic solvents evapor ⁇ ate to environment. Production rate is limited since the increase of speed leads to more splashing of glue. Also the repeated need for washing lowers efficiency. Scrapers that are worn out or out of order let through lumps of glue leading to improper joints and increased adhesive consumption.
• An object of the invention is to provide a novel
• O PI device capable of eliminating all the above drawbacks involved in the fabrication of multi-layer sacks.
• fig. 1 is a perspective view of one embodiment of an adhesive spreading roll used in a device of the invention.
• Fig. 2 shows in axial section an adhesive spreading roll provided with appropriate adhesive supply means.
• Fig. 3 is a larger scale sectional view along line III-II in fig. 2 showing the design of one embodiment of an adhesive supply nozzle.
• Fig. 4 is a diagrammatic view of a device of the invention in which the adhesive supply - rolls are employed in a novel manner to provide an automatic paper sack production line.
• a roll 10 is mounted on a shaf 11 which is rotated by a drive motor 12 through a gear 13.
• Mounted on shaft 11 is an adhesive dispensing chamber 14 which on the sides and on the inner rim is confined by a core member 5 rotating along with shaft 11.
• chamber 14 On the outer rim side, chamber 14 is confined by a fixed cylinder jacket 17 packed with seals 16 relative to core member 15. The adhesive is driven by the application of pressure through a hose 18 passed through rim jacket 17.
• the partially circling array of nozzles 20 is located adjacent the edge of roll 10 and associated with the ends of this array are one or more axially extending arrays of nozzles 21.
• Nozzles 20, 21 are each individually connected by means of hoses 29 to adhesive dispensing chamber 14.
• the nozzle assembly shown in fig. 3 comprises a tubul ⁇ ar body member 21 which is secured to a roll jacket hole by means of locking nuts 29 and 30. Threaded on the outer end of body 21 is a nozzle cap 22 whose orifice is closed by a shut-off means 23 through the pressure of a spring 24. A rod 25 associated with shut-off means 23 urges another shut-off means 26 against the action of a spring 28 so as' to keep shut- off means 26 off a seat surface 27 permitting the passage of adhesive. Shut-off means 26 along with its spring 28 is fitted in a mounting sleeve 31 secured with threads 32 inside said body 21. The top end of sleeve 31 is provided with slots 33 for allowing the passage of adhesive.
• shut-off means 23 temporarily inwards with
• OMPI a consequence that adhesive is extruding out of the nozzle slot.
• the amount of adhesive coming out of the nozzle depends on the rotational speed of roll 10, viscosity of the adhesive and the supply pressure applied.
• the amount of adhesive can be controlled by controlling the supply pressure.
• the same roll can be provided with a sufficient number of nozzle arrays by means of which the posit- ionas and lengths of adhesive joints can be adjusted by only activating the desired arrays of nozzles.
• the machine can be readily readjusted to make it suitable for the fabrication of e.g. sacks of various sizes.
• the roll shown in fig. 1 is intended for producing a patterned adhesive joint for a sealing flap ' made in the bottom of a sack by folding. The width of a bottom can be varied by deciding to use either one of the axial arrays 21.
• the bottom end of said nozzle body 21 is provided with a plastic flexible connecting hose 19 whose other end communicates with adhesive dispensing chamber 14.
• FIG. 4 The application of a jointing adhesive spreading roll of the invention is depicted in fig. 4.
• the figure shows diagrammatically an assembly for the fabricat ⁇ ion of multi-layer paper sacks or bags.
• Rolls E are provided with axially extending arrays of nozzles for making transverse joints or seams in the super- imposed paper webs that make up the various layers of a paper sack.
• an axially short sizing or gluing roll C around whose periphery extends an array of adhesive nozzles for producing a lengthwise joint in view of making a hose.
• the present case deals with the fabrication of sacks sealable at both ends, the filling end of a sack being fitted with a tubular filling valve.
• a hose or tube is cut into lengths in a manner that the filling ends of two successive sack blanks are at any given moment abutting and at the next position the bottoms are abutting.
• Such blanks are passed onto two parallel bottom fabricat ⁇ ing lines.
• Each bottom fabricating line is provided with two pairs of rolls A, A., and A, A., on the same axial line.
• the sealable sack bottoms are folded in a per se known manner and pass each under its own pair of rolls A, A- .
• roll A produces a patterned joint (see fig. 1) and roll A., produces a straight bottom joint.
• a roll B applies an adhesive joint for fastening a fill ⁇ ing valve tube.
• Rolls D make adhesive joints at each end of a sack for gluing a bottom flap.
• the adhesive is supplied from a pump not shown to a manually operated shut-off valve 1 , through a manually operated pressure reducer 5 and an electric adhesive volume controller 4 and further through an electric three-way valve 3 to an adhesive lead-in 2 which is

Landscapes

• Making Paper Articles (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=8516710

Family Applications (1)

Country Status (5)

Cited By (2)

Citations (8)

• 1983
  • 1983-02-04 FI FI830385A patent/FI71678C/fi not_active IP Right Cessation
• 1984
  • 1984-02-03 WO PCT/FI1984/000012 patent/WO1984003058A1/en active IP Right Grant
  • 1984-02-03 EP EP84900620A patent/EP0135520B1/en not_active Expired
  • 1984-02-03 DE DE8484900620T patent/DE3467514D1/de not_active Expired
  • 1984-02-03 JP JP59500780A patent/JPS60500407A/ja active Pending

Patent Citations (8)

Also Published As

Similar Documents

Legal Events