EP0146819A2 - Sac à valve en matière plastique - Google Patents

Sac à valve en matière plastique Download PDF

Info

Publication number
EP0146819A2
EP0146819A2 EP84114516A EP84114516A EP0146819A2 EP 0146819 A2 EP0146819 A2 EP 0146819A2 EP 84114516 A EP84114516 A EP 84114516A EP 84114516 A EP84114516 A EP 84114516A EP 0146819 A2 EP0146819 A2 EP 0146819A2
Authority
EP
European Patent Office
Prior art keywords
base
valve
adhesive
sheet
width
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.)
Granted
Application number
EP84114516A
Other languages
German (de)
English (en)
Other versions
EP0146819A3 (en
EP0146819B1 (fr
Inventor
Josef Poppe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bischof and Klein SE and Co KG
Original Assignee
Bischof and Klein SE and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bischof and Klein SE and Co KG filed Critical Bischof and Klein SE and Co KG
Publication of EP0146819A2 publication Critical patent/EP0146819A2/fr
Publication of EP0146819A3 publication Critical patent/EP0146819A3/de
Application granted granted Critical
Publication of EP0146819B1 publication Critical patent/EP0146819B1/fr
Expired legal-status Critical Current

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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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B65D31/145—Valve bags, i.e. with valves for filling the filling port being provided in a flat upper sealing-edge

Definitions

  • the invention relates to a valve sack made of plastic film, consisting of a sack tube closed at its ends by a stand-up base and a valve base, the sack bases each being formed by a molded base, the corner inserts and bottom side envelopes lying opposite one another in pairs, an inner base sheet and an outer cover sheet and one Includes valve insert in the valve base, which are connected to one another by adhesive applications on the outside of the bag hose along its edge and on the inside of the cover sheet comprehensive adhesive connections for forming the bottom.
  • the adhesive applications provided for the mutual bonding of the bottom parts are carried out in the manner of a thin layer of contact adhesive, the bottom folding and the mutual bonding of the bottom parts taking place after the solvent of the contact adhesive has dried.
  • the adhesive is then in a dry or almost dry state and only sticks to itself, i.e. two similar layers of adhesive.
  • outer cover sheets in the known valve sack which are thicker than the bag tube film and are therefore not as conformable during the bonding as would be required for a full-area bonding.
  • the use of thicker outer bottom cover sheets is caused by the bottom side envelopes which partially overlap each other in the closed molded bottom, because otherwise the top sheet in its longitudinal direction can easily break along the edge of the outer bottom side envelope under impact loads.
  • the invention has for its object to create a valve bag made of plastic film of the type mentioned, the mold bottoms have an increased tightness and de can be produced at high machine speeds
  • the adhesive applications are designed in the manner of pressure-sensitive adhesives, the width of each bottom side envelope measured in the transverse direction of the mold base is less than half the base width of the respective mold base and the inner base sheet itself is kept free of adhesive applications, with the adhesive application on at least one of the Ver is sticky and has a width exceeding the bottom width and the combined width of the bottom side envelopes.
  • the adhesive-like design of the adhesive applications allows the inner base sheet to be bonded without the latter itself having a corresponding adhesive application.
  • the adhesive used for the adhesive applications is set to be soft and sticky in such a way that a very sticky surface is provided by the adhesive applications at the time of mutual bonding of the parts of the floor to be connected, the adhesive strength being improved by correspondingly thick adhesive applications can.
  • an adhesive based on a known contact adhesive which consists of a mixture of isocyanate-modified polyesters with free hydroxyl groups and isocyanate resins and is dissolved for application in a solvent, for example by using polyester resins with a correspondingly low level Molecular weight, a soft adjustment of this adhesive with increased surface stickiness at the time of the layer adhesive bonding can be achieved in such a way that the adhesive applications are also bonded to areas free of liver, in the manner of a pressure sensitive adhesive.
  • the inner bottom sheet is glued to the respective corner wedge with the adhesive application in the inventive design of the valve bag in such a way that a channel Formation on the folded edges between the corner folds and the bottom side envelopes is avoided if the side parts of the base sheet lying outside the usual bottom side fold lines are folded inwards together with the bottom side envelopes to close the shaped bottom.
  • the adhesive application lying on top of the corner wrap is covered by the inner base sheet or, in the case of a valve base, by a valve insert, so that there is no need to worry about the sticky adhesive orders being smeared when the sack hoses are transported through the floor folding station is.
  • the valve bag according to the invention can therefore be manufactured at high machine speeds.
  • each bottom side envelope is less than half the bottom width of the respective mold bottom in the sack configuration according to the invention, mutual overlap of the bottom side envelopes in the mold bottom and thus an area of the outer cover sheet which is prone to breakage are avoided.
  • the outer cover sheet can therefore be dimensioned correspondingly thinner and, for this reason, has an improved conformability when gluing, which further improves the tightness of the adhesive connection of the mold base.
  • the starting workpiece for the valve bag shown in the drawing is a bag hose 1 made of thermoplastic material Material film, such as a polyolefin film, for example polyethylene film, which is provided with an all-round adhesive application 2 along the edge of its initially open ends on the outside.
  • the bag hose 1 is drawn up at both ends in a floor-laying machine to form open floors 3 and 4.
  • the mold base 3 forms the stand base and the mold base 4 the valve base of the bag hose 1.
  • the shaped bottoms 3 and 4 each have the shape of a cross bottom in the example shown, but in their place, so-called block bottoms can also take place, if, unlike in the example shown, a tube piece with inserted side gussets is used as the starting workpiece .
  • the shaped or cross bottoms 3 and 4 comprise pairs of opposing corner inserts 5,6 and bottom side envelopes 7,8.
  • portions 2a of the adhesive application 2 lie on the top of the corner inserts 5 and 6 and portions 2b on the underside of the bottom side envelopes 7 and 8, which are folded inward to close the bottom along bottom-side fold lines 9 drawn in dash-dot lines in FIG. 4.
  • an inner base sheet 10 is glued onto the sections 2a of the adhesive application 2, which has a strongly sticky surface, and which itself does not carry an adhesive application on its underside or on its upper side.
  • an incoming floor sheet 10 has a width which exceeds the floor width determined by the transverse between the two bottom side fold lines 9 of the respective floor and the combined width of the bottom side envelopes 7 and 8, so that it corresponds to the Representation in Fig. 1 protrudes beyond the marginal edges 11 and 12 of the bottom side envelopes 7 and 8.
  • Bottom side envelopes 7 and 8 have a width that is less than the base width.
  • the design of the valve base 4 differs from that of the base 3 in that the inner base sheet 10 'is shortened in length so that it is only glued to the portion 2a of the adhesive application 2 in the area of the corner wrap 6.
  • the base sheet 10 ' is shortened in length to such an extent that it is limited to only one half of the base; however, it can also have a length which is further drawn towards the corner wedge 5, but which does not reach it, since a tubular valve insert 13 is glued onto the section 2a of the adhesive application 2 of the corner wedge 5.
  • the valve insert 13 forms an outside pocket valve, known per se, with a sleeve 14. the valve insert 13 opening into the sack is filled, the sack being filled after filling, the outer part 15 of the valve insert 13 into an outer pocket formed by the sleeve 14 as a valve closure.
  • the base side flaps 7 and 8 of both bases 3 and 4 are folded inward about the base side fold lines 9, as is shown in FIG. 2.
  • the bottom sheet 10, 10 ' which is selected to be thinner than the film material of the bag tube 1, is folded over together with the bottom side envelopes 7 and 8.
  • Triangular end regions 16 of the corner inserts 5 and 6 are included in the bottom side envelopes 7 and 8 to form folded edges 17 between the corner inserts 5, 6 and the bottom side envelopes 7, 8.
  • the width of the bottom sheet 10, 10 ' is selected such that the side parts 10a and 10b of the bottom sheet 10, 10' folded inwards together with the bottom side envelopes 7 and 8 along the fold lines 9 match with them mutually facing edge areas overlap each other. This results in a reinforcement along the center of the floor.
  • an outer cover sheet 18 is glued onto the molded trays 3 and 4 with their inwardly folded bottom side envelopes 7 and 8, which for this purpose carries an adhesive application on its underside.
  • this adhesive application on the underside which, like the adhesive application 2 mentioned at the outset, is formed by a soft and tacky adhesive
  • the bottom sheet 18 is finally bonded not only to the portions 2b of the adhesive which are not shown in FIGS. 2 and 3.
  • the cover sheet 18 projects with its end parts 19 over the edge edges of the inner base sheet 10 in the area of the corner turns 5 and 6 of the base 3 or the edge edge of the inner base sheet 10' in Area of the corner fold 6 of the valve base 4, the other end part 19 of the cover sheet 18 being glued to the top of the valve insert 13 here.
  • the cover sheet 18 can in turn have a smaller thickness than the film material of the bag hose 1, so that it has a good conformability to the material layers in the respective mold base 3, 4 in the interest of a full-surface, tight adhesive bond.
  • the exemplary embodiment according to FIGS. 4 to 6 differs from that according to FIGS. 1 to 3 by a different design of the valve base 4. For the same or corresponding parts, the same reference numerals are used as in the case of the exemplary embodiment according to FIGS 3 have been used.
  • a tubular valve insert 20 is glued in the middle to the corner wrap 5 on the portion 2a of the adhesive application 2, the inner region 21 of which extends beyond the inner edge of the corner wrap 5 and projects into the interior of the sack.
  • the valve insert 20 forms a so-called inner valve, the inner region 21 of which causes an automatic valve closure after the bag has been filled with filling material.
  • the tubular valve insert 20 which e.g. is formed from a seamlessly extruded, thin piece of hose made of plastic film, is glued as a flat hose to the corner wrap 5 and carries an adhesive application 22 on the outside on its upper side or the upper half of the flat hose, which corresponds in its nature to the adhesive application 2.
  • an adhesive-free base sheet 10 of the same size as the base sheet 10 of the base 3 glued into the open valve base 4 its gluing in the area of the corner wrap 6 with the portion 2a of the adhesive application 2 and in the area of the corner wrap 5 with the areas of Part 2a takes place on both sides of the valve insert 20 and in the area in between with the adhesive application 22 of the valve insert 20.
  • a further modification of the first embodiment is made in that the width of the base sheet 10 in both the stand base 3 and in the valve base 4 is dimensioned such that the side parts 10a and 10b of the base sheet 10 folded over together with the base side envelopes 7 and 8 in the closed base according to Fig. 5 with their facing edge edges 23 and 24 at a distance are arranged differently.
  • a layered gradation between the bottom side envelopes 7 and 8 towards the center of the bottom is achieved in the closed mold base 3, 4, which, due to an improved application possibility for the cover sheet 18 finally applied to the closed mold bases 3, 4, advantageously closes the tightness of the cover sheet 18 by means of the cover sheet 18 induced bonding affects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
EP84114516A 1983-12-28 1984-11-30 Sac à valve en matière plastique Expired EP0146819B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8337443U 1983-12-28
DE8337443U DE8337443U1 (de) 1983-12-28 1983-12-28 Ventilsack aus Kunststoffolie

Publications (3)

Publication Number Publication Date
EP0146819A2 true EP0146819A2 (fr) 1985-07-03
EP0146819A3 EP0146819A3 (en) 1986-11-05
EP0146819B1 EP0146819B1 (fr) 1989-04-12

Family

ID=6760349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114516A Expired EP0146819B1 (fr) 1983-12-28 1984-11-30 Sac à valve en matière plastique

Country Status (5)

Country Link
US (1) US4637062A (fr)
EP (1) EP0146819B1 (fr)
DE (2) DE8337443U1 (fr)
ES (1) ES283621U (fr)
PT (1) PT79754A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918741A1 (de) * 1989-06-08 1990-12-13 Honsel Karl Heinz Beutel
WO2018166833A1 (fr) * 2017-03-13 2018-09-20 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Sac à valve multicouche
DE102021128582A1 (de) 2021-11-03 2023-05-04 Urs Lendenmann Faltbehälter mit Traggriff, Traggriff für einen Faltbehälter und Verwendung eines Faltbehälters als Sportgerät

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20000169A (fi) * 2000-01-28 2001-07-29 Upm Kymmene Corp Venttiilisäkki
DE102007015099A1 (de) * 2007-03-29 2008-10-02 Construction Research & Technology Gmbh Papierventilsack mit Innenriegel
DE102008017446A1 (de) * 2008-04-03 2009-10-15 Windmöller & Hölscher Kg Vorrichtung und Verfahren zur Herstellung von Säcken
DE202009003080U1 (de) * 2009-03-04 2009-04-30 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Papiersack
EP2608954B1 (fr) * 2010-08-25 2017-03-15 Windmöller & Hölscher KG Sac et procédé de fabrication de sacs
DE202021102384U1 (de) * 2021-05-04 2022-08-05 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Sack für Schüttgut

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1175846A (fr) * 1957-05-29 1959-04-02 Antwerp Jute Company Procédé de fabrication de sacs et sacs obtenus par ce procédé
GB1039134A (en) * 1963-03-12 1966-08-17 Psg Plastik Sack G M B H Improvements in or relating to synthetic plastic bags
DE1611668A1 (de) * 1967-09-08 1971-01-14 Hans Lissner Sackartiger Behaelter aus Kunststoff mit Kreuzboden sowie Verfahren zur Herstellung eines solchen Behaelters
DE1753634B2 (de) * 1963-04-11 1971-10-14 Verfahren klebstoff und vorrichtung zum bilden eines kreuz bodens an einem schlauchstueck zur herstellung eines kreuz bodensackes
FR2366176A1 (fr) * 1976-10-01 1978-04-28 Windmoeller & Hoelscher Fond en croix pour sac fabrique a partir d'un segment de feuille tubulaire

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB483330A (en) * 1936-10-17 1938-04-19 Smidth & Co As F L Improvements in valve bags
US2201675A (en) * 1936-10-17 1940-05-21 Smidth & Co As F L Bag
US2275505A (en) * 1939-03-07 1942-03-10 St Regis Paper Co Valve bag
DE869292C (de) * 1950-07-02 1953-03-02 Natronzellstoff Und Papierfabr Kreuzbodensack mit innerem Bodenblatt
US3130897A (en) * 1961-06-08 1964-04-28 St Regis Cons Packaging Ltd Valve inserts for valve bags
NL288313A (fr) * 1962-01-29 1900-01-01
DE1411863A1 (de) * 1962-07-21 1969-05-14 Windmoeller & Hoelscher Kreuzbodensack aus schweissbarem Werkstoff sowie Verfahren und Einrichtung zu seiner Herstellung
DE1486470A1 (de) * 1964-04-03 1969-06-04 Lissner & Co Geb Aus Kunststoffolie bestehender Sack mit Kreuzboden
US3397622A (en) * 1965-05-05 1968-08-20 Bemis Co Inc Bags
US3291376A (en) * 1965-05-05 1966-12-13 Bemis Co Inc Bags
DE2323726A1 (de) * 1973-05-10 1974-11-21 Windmoeller & Hoelscher Kreuzbodensack
US4049191A (en) * 1976-02-02 1977-09-20 Great Plains Bag Corporation Block bottom valve bag
DE2755514C2 (de) * 1977-12-13 1985-05-09 Windmöller & Hölscher, 4540 Lengerich Sack aus Kunststoff mit Innenriegel, Bodendeckblatt und Einrichtung zum Entleeren
NL8101126A (nl) * 1981-03-09 1982-10-01 Wavin Bv Kunststofzak met ontluchting.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1175846A (fr) * 1957-05-29 1959-04-02 Antwerp Jute Company Procédé de fabrication de sacs et sacs obtenus par ce procédé
GB1039134A (en) * 1963-03-12 1966-08-17 Psg Plastik Sack G M B H Improvements in or relating to synthetic plastic bags
DE1753634B2 (de) * 1963-04-11 1971-10-14 Verfahren klebstoff und vorrichtung zum bilden eines kreuz bodens an einem schlauchstueck zur herstellung eines kreuz bodensackes
DE1611668A1 (de) * 1967-09-08 1971-01-14 Hans Lissner Sackartiger Behaelter aus Kunststoff mit Kreuzboden sowie Verfahren zur Herstellung eines solchen Behaelters
FR2366176A1 (fr) * 1976-10-01 1978-04-28 Windmoeller & Hoelscher Fond en croix pour sac fabrique a partir d'un segment de feuille tubulaire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3918741A1 (de) * 1989-06-08 1990-12-13 Honsel Karl Heinz Beutel
WO2018166833A1 (fr) * 2017-03-13 2018-09-20 Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh Sac à valve multicouche
DE102021128582A1 (de) 2021-11-03 2023-05-04 Urs Lendenmann Faltbehälter mit Traggriff, Traggriff für einen Faltbehälter und Verwendung eines Faltbehälters als Sportgerät
WO2023078933A1 (fr) 2021-11-03 2023-05-11 Urs Lendenmann Récipient pliable doté d'une poignée, poignée pour un récipient pliable et utilisation d'un récipient pliable en tant qu'appareil de sport

Also Published As

Publication number Publication date
DE3477656D1 (en) 1989-05-18
EP0146819A3 (en) 1986-11-05
US4637062A (en) 1987-01-13
ES283621U (es) 1985-05-16
EP0146819B1 (fr) 1989-04-12
PT79754A (de) 1985-01-01
DE8337443U1 (de) 1984-02-02

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