DE8909750U1 - Filling nozzle or bung for film containers or bags made of polyethylene or similar. - Google Patents

Description

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·'· · ·' '··' .t* PATENT ATTORNEY

DIPL-ING. KLAUS-JÜRGEN SCHWARZ PATENT ATTORNEY BLACK. QLUCKSTRASSE 7. D-OOO BONN 1 EUROPEAN PATENT ATTORNEY Applicant; 14 August 1989

Sieger Plastic GmbH
Farbmühlenstrasse 11

5160 D ü r e &eegr;

G e b * a u sheatizster

Filling caps or bungs for raw containers or bags
made of polyethylene or similar

The invention relates to a filling nozzle or bung for inner containers or bags made of polyethylene or the like according to the preamble of claim 1.

Usually, the bung part of such filling nozzles or bungs is made of polyethylene (PE) or a linear low-density polyethylene (LLDPE) in order to optimally ensure welding with the polyethylene layer of the container or bag film. The closure or tap part, on the other hand, is usually made of polypropylene (PP).

It has been shown that parts made of PE or LLDPE and PP that are closely joined together cannot be easily twisted against each other due to the different properties of these plastics. This is particularly due to the fact that PP and PE or LLDPE have different linear expansion coefficients.

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$ used LLDPE, LDPE or EVA. PE, on the other hand, is also softer than PP, which means that the bung part deforms easily both on the flange part and on the bung body itself. The flange part can thus become corrugated, which can make it difficult to feed such bung parts into automatic welding machines for connecting the filling nozzles or bungs to the film material of the film bag or container. Currently, the stresses on the flange during the

H Production of the bung (too fast injection molding speed

t during storage (for example, the effect of external temperatures) and during transport, often lead to uneven flange parts and thus cause stops in the bag sealing machines.

Furthermore, any ovality on the bung body "■' causes rotation and sealing problems.

% The invention is based on the object of avoiding these difficulties in a filling nozzle or bung according to the preamble of claim 1 by designing the bung part in such a way that it is dimensionally stable even under high mechanical and changing thermal stresses, that

L on the other hand, but you have a perfect tight welding connection

/: bond between the flange part and the film material of the film container.T or bag is ensured in a simple manner.

This object is achieved according to the invention by the characterizing part of claim 1, while particularly advantageous further developments of the invention are characterized in claims 2 to 7.

The invention ensures optimum shape stability of the bung part on such filling nozzles or bungs, which enables optimum rotation of the closure part

or tap part without increased friction. Such filling nozzles or bungs can be easily manufactured on injection molding machines with two extruders. If necessary, reinforcement can be built into the seam between the PP base body of the bung part and the part or parts or the coating made of polyethylene or the like by means of interlocking, block or column formation or other geometries.

Another possibility is to spray a PE layer or similar onto the surface of the flange part on the PP carrier body. This also prevents the frequent formation of waves on the flange part of the bung, since PP as a carrier material is harder than the PE coating and therefore ensures greater stability, dimensional accuracy and rotational ability.

Preferred embodiments of the invention are shown schematically in the drawing.

Fig. 1 is a vertical partial section on both sides of a dash-dotted central line through a first and a second embodiment of a filling nozzle or bung for welding to a film container or bag made of polyethylene or the like,

Fig. 2 also shows a vertical section through two further embodiments of such filling nozzles or bungs modified from Fig. 1,

Fig. 3 is a vertical section through yet another modified embodiment.

Fig. 4 again shows a vertical section through two further modified versions of such filling nozzles or bungs on both sides of a dash-dotted center line and

Fig. 5 shows another embodiment of a filling nozzle or bung with a closure part which is rotatably arranged inside the bung part.

In each of the filling nozzles or bungs 1 shown, which are intended for welding to film containers or bags 2 made of polyethylene (PE) or the like, both the bung part 3 and the closure part 4, which can be rotated on the bung part 3 between a closed and an open position, are made of polypropylene (PP) or the like, while the flange part 5 of the bung part 3 is either completely or at least partially made of polyethylene (PE, LLDPE), EVA or the like.

Thus, in the first embodiment shown in Fig. 1 to the left of the dash-dotted center line, in addition to the rotary locking mechanism 4, the flange part 2 also consists entirely of polypropylene or the like, with a coating or layer 6 made of polyethylene (PE, LLDPE), EVA or the like being provided on the upper side of the flange part 5 for welding to the container or bag film 2.

If the container or bag film 2 is to be welded to the underside of the flange part 5, this can, as shown on the right-hand side of Fig. 1, have such a cover 6 made of polyethylene (PE, LLDPE), EVA or the like on the underside of the flange part 5 for welding to the container or bag film 2, whereby this cover or layer 6 can also be pulled up further on the inside of the bung part 3 and formed in one piece with sealing lips 7 for sealing between the bung part 3 and the closure part 4.

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As shown here on both the left and right sides of Fig. 2, the coating or layer 6 made of polyethylene (PE, LLDPB), EVA or the like on the flange 5 can also extend continuously from the top of the flange around the flange edge to the bottom of the flange, so that optional welding to the container or bag film 2 is possible both on the top of the flange and on the bottom of the flange without any structural changes. Here too, as shown on the right side in Fig. 2, the coating or layer 6 can extend from the flange part 5 further to the inside of the bung or, if necessary, also to the outside of the bung.

In the embodiment of Fig. 3, the bung part 3 is formed with a continuous carrier body 3a made of polypropylene (PP), which is provided with a continuous coating 6 made of polyethylene (PE, LLDPE), EVA or the like on both the flange top and the outside of the bung part 3, on which the sealing lips 7 for sealing between the bung part 3 and the closure part 4 are also formed in one piece.

In Fig. 4, a further simplified embodiment of such a filling nozzle or bung 1 is shown, whereby in the left part of Fig. 4, the flange part 5 formed in one piece with the bung part 3 has only a small radial width and is formed on its underside with a radially outwardly projecting coating 6 made of polyethylene, EVA or the like for welding to the container or bag film 2. The coating 6 extends into the cylindrical section of the bung part 3 and is firmly interlocked with it, as in all other embodiments shown.

In contrast, in the right-hand embodiment of Fig. 4, the coating 6 made of polyethylene, EVA or the like is formed over the entire flange underside and extends beyond the inside of the bung part 3,

while sealing lips 7 made of polyethylene or the like are integrally formed on the outside of the polypropylene base body of the bung part 3 for sealing against the rotatable closure part 4 made of polypropylene or the like that overlaps the bung part 3.

In the embodiment of Fig. 5 ^, the closure part 4 is arranged rotatably inside the bung part 3. The bung part 3 consists of a plastic ^cover 4 made of polyethylene, ^{EVA or} the like and is formed on the flange part 5 with a coating or a layer 6 made of polyethylene, EVA or the like for welding to the container or bag film 2, wherein the coating 6 can also be formed on the underside of the flange as required and can optionally also extend further upwards on the bung part 3 itself.

In an embodiment that is simplified compared to the embodiments shown, the flange part 5 can also be made entirely of polyethylene (PE, LLDPE), EVA or the like in a ring shape and firmly connected to the bung part 3 by a smooth, jagged or similarly designed connection.

Claims (7)

Protection claims 1. Filling nozzle or bung for film containers or bags made of polyethylene (PE) or the like with a bung part and a closure part that can be rotated between a closed and an open position, which consists e.g. of polypropylene (PP) or another dimensionally stable, rotatable plastic, characterized in that the bung part (3) consists of the same plastic material as the closure part (4) and is designed on the flange part (5) for welding to the film container or bag (2) made of polyethylene (PE, LLDPE), EVA or the like. 2. Filling nozzle or bung according to claim 1, characterized in that the flange part (5) consists entirely of polyethylene (PE, LLDPE), EVA or the like and is firmly connected in one piece to the bung part (3). 3. Filling nozzle or bung according to claim 1, characterized in that the flange part (5) consists of polypropylene (PP) and is formed in at least two layers with a coating or a layer (6) of polyethylene (PE, LLDPE), EVA or the like on its upper side and/or on its lower side. 4. Filling nozzle or bung according to claim 3, characterized in that the cover or layer (6) made of polyethylene (PE, LLDPE), EVA or the like extends from the top around the flange edge to the bottom of the flange part (CS). 5. A flanged socket or bung according to one or more of claims 1 to 4, characterized in that the covering or layer (6) made of polyethylene (PE, LLDPE, EVA or the like) extends from the flange (S) to the inside of the bung or to the outside of the bung. 6. Filling nozzle or bung according to claim 5, characterized in that one or more sealing lips (7) for sealing between the bung part (3) and the closure part (4) are formed in one piece on the cover or the layer (6) made of polyethylene (PE, LLDPE), EVA or the like. 7. Filling nozzle or bung according to claim 1, characterized in that the part or parts made of polyethylene (PE, LLDPE), EVA or the like on the bung part (3) is or are firmly interlocked with the carrier material made of polypropylene (PP) or the like. NEW6/35