EP0099563A2 - Sac en matière plastique pour produits pulvérulents ou granuleux et procédé de fabrication et de fermeture d'un tel sac - Google Patents

Sac en matière plastique pour produits pulvérulents ou granuleux et procédé de fabrication et de fermeture d'un tel sac Download PDF

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Publication number
EP0099563A2
EP0099563A2 EP83106989A EP83106989A EP0099563A2 EP 0099563 A2 EP0099563 A2 EP 0099563A2 EP 83106989 A EP83106989 A EP 83106989A EP 83106989 A EP83106989 A EP 83106989A EP 0099563 A2 EP0099563 A2 EP 0099563A2
Authority
EP
European Patent Office
Prior art keywords
slot
welded
front wall
strip
filling
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.)
Withdrawn
Application number
EP83106989A
Other languages
German (de)
English (en)
Other versions
EP0099563A3 (fr
Inventor
Hans Lissner
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0099563A2 publication Critical patent/EP0099563A2/fr
Publication of EP0099563A3 publication Critical patent/EP0099563A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/02—Local reinforcements or stiffening inserts, e.g. wires, strings, strips or frames

Definitions

  • the invention relates to a plastic bag for granular or powdery bulk material, consisting of a plastic film tube which is closed at both ends by a transverse weld seam, in the front wall of which a slot serving as a filling opening and closed with a welded cover sheet of film is provided near a cross weld seam .
  • Such a plastic bag is known (DE-OS 2 630 793).
  • Such a bag is simpler in construction and therefore easier to manufacture than a cross-bottom valve bag, which is closed at least at the valve-side end by a fold, because of the transverse weld seams provided at both ends and the filler slots which can be closed by the weldable cover sheet.
  • the disadvantage of both sacks is that after filling, when later handling or transporting the sack, bulk material escapes unintentionally. For these reasons, there is a need for a sack that can be closed in a dust-tight manner.
  • a dust-tight closure of the known bag with the cover sheet that can be welded on via the slot is theoretically possible.
  • a prerequisite for a perfect welded connection is that after filling the sack, the areas to be welded on the outside of the sack adjacent to the slit are cleaned of adhering bulk material via a filler neck inserted through the slot. If the cover sheet is only welded on after filling, the areas adjacent to the slot can be easily cleaned, but if, as in two further exemplary embodiments, the cover sheet is filled with a U-shaped weld seam on the front before filling to form a pocket covering the slot If the front wall is welded on the inside or outside, perfect cleaning is hardly or no longer possible. For this reason, perfect welding cannot take place in these cases.
  • the wrapper for the known plastic bag arise when welding even trouble if the cover sheet is welded after filling.
  • the properties of the cover sheet and how the welding process is carried out are not described in the prior art. If the filling material is used as an abutment when welding the cover sheet, the filling material is pressed out through the slot when the filling jaw is pressed on, so that the previously cleaned areas become dirty again before welding and therefore hinder, if not prevent, the welding .
  • the back pressure applied by the filling material as an abutment hardly sufficient for a perfect weld.
  • the cover sheet welded on prior to the filling process and forming a pocket does not limit the slot and therefore does not have any reinforcing function.
  • the welded cover sheet increases the risk of tearing because the slot torn out up to the weld seam of the cover sheet meets a particularly weak point on the weld seam and then continues to tear along the weld seam.
  • the invention has for its object to improve a sack of the type mentioned for granular or powdery bulk material and a method for its production and its closing after filling so that it does not tear open during filling and the cover sheet can be welded on easily and properly without that the back wall of the sack is affected.
  • a slit strip of film serving as a heat barrier and reinforcement is fastened to the front wall in the areas between the cover sheet and the rear wall adjacent to the slot and to be welded to the cover sheet, the slot of which is substantially congruent with the slot in the front wall of the bag.
  • the plastic sack is only filled to just below the slot and then the outer areas of the front wall adjacent to the slot are cleaned of bulk material residues in order to be able to weld the cover sheet.
  • the invention consists in that, prior to filling the sack with bulk material, a slit strip of film serving as a heat barrier and reinforcement is attached to the areas to be covered by the cover sheet and adjacent to the slit in such a way that the slits are congruent, and that after the filling of the sack, the cover sheet is welded on with sack walls lying flat on top of one another and held under pressure by welding jaws, the heat being supplied exclusively from the cover sheet side and the strip serving as a heat barrier prevents the rear wall from heating up to softening or welding temperature.
  • the cover sheet t is only welded onto the sack after filling, the areas to be welded adjacent to the slot can be easily cleaned.
  • the bag is clamped above the filling material and below the slit and is kept clamped at least until the cover sheet is welded on.
  • the sack is preferably kept clamped until after the cover sheet has been welded on, in order to protect the areas which have softened immediately after the welding on by the welding heat supplied from an early load.
  • the cleaning of the areas adjacent to the slot is not impaired by the slotted strip serving as a heat barrier and reinforcement, be it that the strip is fastened to the front wall of the sack on the inside or outside.
  • the strip since the strip is already attached before the filling, it acts as a reinforcement, so that the risk no longer exists or is at least reduced that the slot tears open due to the load caused by a filler neck inserted into the slot.
  • the strip Since the strip also forms a heat barrier at the same time, there is also no risk that the rear wall will be adversely affected by the welding heat generated when the cover sheet is welded on.
  • the heat barrier prevents the rear wall from being supplied with so much heat that it softens with material weakening or even welds.
  • the rear wall can be protected against softening and welding by cooling the rear wall while the cover sheet is being welded on.
  • welding the rear wall to the front wall can be further reduced by applying a release agent, for example in the form of a coating, between the rear wall and the front wall.
  • a release agent for example in the form of a coating
  • the strip serving as reinforcement has the further advantage that the sack is easier to handle. Because of the greater rigidity in the slot area, both cleaning and opening of the slot is made easier.
  • the greater material thickness in the slot area due to the welded-on strip also favors the clamping of the sacks on filling nozzles by means of clamping jaws. The material thickness can be chosen so large that even a positive clamping is possible.
  • the strip should have at least twice the material thickness of the sack.
  • the opening of the slot can be further facilitated in that the strips lying on both sides of the slot are biased in the opposite direction. Because of this bias, the slot is kept a little open. Finally, the risk of tearing can be further reduced by using reinforced material as the material for the strip.
  • the strip can be attached to the front wall both inside and outside.
  • the strip can be welded to the front wall in sections or continuously. If an airtight seal is required, a strip on the outside must be welded in one piece and continuously. If the strip is arranged on the inside, it makes no difference for an airtight seal whether a one- or two-part strip is selected.
  • the slot In order to achieve a high degree of filling of the sack, the slot should be arranged as close as possible to the cross weld. Also for reasons of material savings, the strip should be as narrow as possible and only a little longer than the slot, unless it comprises a foldable flap that can be used as a cover sheet. A width of 3 to 4 cm of the strip has proven to be sufficient.
  • the strip can be constructed in one or more layers. In the case of a multi-layer structure, the individual layers are welded on one after the other. This results in a lower thermal load on the sack material. '
  • the strip can run parallel to the transverse weld seam or can be arranged on a sack corner, running transversely to the sack diagonal.
  • the second alternative enables a higher degree of filling due to the possible corner filling.
  • the plastic bag shown in the drawing is intended for the transport and storage of granular or powdery bulk goods. It consists of a section 1 of a gusseted tube made of plastic material, which is closed at both ends with continuous transverse weld seams 2, 3.
  • a slot 5 which is as close as possible, e.g. 1 to 3 cm, below the cross weld and arranged essentially parallel to it.
  • the rear wall 6 does not have such a slot.
  • a plastic strip 7 is fastened to the inside of the front wall 4 in the area of the slot 5.
  • This strip 7 has a slot which is congruent with the slot 5 in the front wall 4.
  • the strip 7 is somewhat longer than the two slots 5, 8.
  • the strip 7 is fastened to the inside of the front wall 4 with two weld seams 9, 10 arranged close to the slot 5.
  • weld seams 9, 10 weld spots or sections of weld seams can also be provided.
  • FIG. 3 differs from the embodiment shown in FIG. 2 primarily in that the plastic strip 7 is welded onto the outside of the front wall 4. Unless an airtight seal is required, the dispute can also be used in this case fen be attached to the front wall 4 with welding spots or sections of welds. However, if an airtight closure is desired, a closed weld seam or preferably a full-area weld 11 is required.
  • the plastic strip 7 is preferably made of the same material as the gusseted tube 1, so that it can be welded optimally.
  • the strip 7 should, however, be twice as thick as the material of the gusseted tube 1. This double material thickness can be achieved by using a correspondingly thick film material or by repeatedly welding on thinner film material. Since the strip 7 is welded on before the sack is filled, it is possible to dispense with an additional heat barrier, which is temporarily arranged in front of the rear wall 6, on the inside of the strip 7, since in this case the strip 7 itself acts as a heat barrier. If, on the other hand, the strip is arranged on the outside, a temporary, additional heat barrier should be arranged during the welding of the strip 7 to protect the rear wall 6 between the front and rear walls 4, 6.
  • the sack For filling with bulk goods, the sack is pushed onto the nozzle of a suitable filling system, for example.
  • the spreading of the slot 5 is facilitated if the strip parts lying on both sides of the slot 5, 8 have a pretension in the opposite direction, as a result of which the sack is spread in the area of the slot 5.
  • the edges of the slot 5, which have a greater material thickness than the rest of the bag wall due to the welded-on strip 7, make it easier to clamp onto the connecting piece, in particular if the strip 7 has a material thickness such that a positive locking is possible.
  • the sack is filled only slightly below the slot 5.
  • the sack After filling and removing the filler neck, the sack is clamped above the filling level, but below the slot 5, so that no further bulk material can emerge from the slot 5 during further manipulation, in particular the cleaning of the areas to be welded. Because of the rigidity of the strip 7 in the strip plane, a gaping apart of the strip parts lying on both sides of the slot 5, 8 is prevented in the strip plane.
  • a cover sheet 12 made of film is applied, which covers the slot 5 on all sides, in particular approximately corresponds to the base area of the strip 7 in its base area.
  • the parts lying one on top of the other, namely the rear wall 6, strips 7, front wall 4 and cover sheet 12, are then clamped between two welding jaws, whereby the welding heat is supplied to / from the welding jaw on the side of the cover sheet 12.
  • a full-surface weld 13 of the cover sheet 12 with the front wall 4 or a spot weld or a weld with a continuous weld seam takes place depends on the requirements of the consumer.
  • the full-surface welding not only provides an airtight seal, but also a closure that is as tension-free as possible.
  • a perforation can be provided in the cover sheet 12 in the area of the slot 5, 8 for venting the sack.
  • a filter in the form of a fleece can be welded in between the cover sheet 12 and the front wall 4 or the strip 7.
  • the strip 7 acts as a heat barrier by preventing welding through to the rear wall 6 or even only softening of the rear wall 6. Impairment of the rear wall 6 by the welding heat supplied from the side of the cover sheet 12 by a welding jaw can be prevented by cooling the counter-jaw attached to the rear wall 6.
  • Strip 7 can, in addition to its function as a heat barrier and reinforcement, depending on the type of material, also serve as a flexible abutment, which ensures tolerance compensation. Such a tolerance compensation can also be achieved by means of a resilient support of the welding jaw attached to the rear wall, such as foam rubber.
  • the strip 7 acting as a heat barrier is particularly important when it is necessary to supply a large amount of heat to the weld. This is the case when a cover sheet with a larger material thickness is to be welded on. Such a cover sheet has the advantage that the risk of breakthrough of remaining dust or grain particles through the cover sheet is low or eliminated, even in the case of imperfectly cleaned areas.
  • the slot can be arranged diagonally in a corner of the sack, so that such a sack can be filled in a corner with a high degree of filling, similar to a valve sack.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
EP83106989A 1982-07-16 1983-07-16 Sac en matière plastique pour produits pulvérulents ou granuleux et procédé de fabrication et de fermeture d'un tel sac Withdrawn EP0099563A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3226739 1982-07-16
DE3226739 1982-07-16
DE3229532 1982-08-07
DE3229532 1982-08-07

Publications (2)

Publication Number Publication Date
EP0099563A2 true EP0099563A2 (fr) 1984-02-01
EP0099563A3 EP0099563A3 (fr) 1985-03-06

Family

ID=25803107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106989A Withdrawn EP0099563A3 (fr) 1982-07-16 1983-07-16 Sac en matière plastique pour produits pulvérulents ou granuleux et procédé de fabrication et de fermeture d'un tel sac

Country Status (1)

Country Link
EP (1) EP0099563A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107176372A (zh) * 2017-04-13 2017-09-19 李欣 瓶袋两用的洗衣粉容器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1958597A (en) * 1931-09-12 1934-05-15 Arkell Safety Bag Co Multi-ply bag and method of producing the same
FR2357423A1 (fr) * 1976-07-08 1978-02-03 Windmoeller & Hoelscher Remplissage et fermeture de sachets ou sacs, notamment pour emballage de materiaux poussiereux

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1958597A (en) * 1931-09-12 1934-05-15 Arkell Safety Bag Co Multi-ply bag and method of producing the same
FR2357423A1 (fr) * 1976-07-08 1978-02-03 Windmoeller & Hoelscher Remplissage et fermeture de sachets ou sacs, notamment pour emballage de materiaux poussiereux

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107176372A (zh) * 2017-04-13 2017-09-19 李欣 瓶袋两用的洗衣粉容器

Also Published As

Publication number Publication date
EP0099563A3 (fr) 1985-03-06

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Effective date: 19851107