Film back injection spout

Abstract

The present invention relates to an injection spout for a film bag comprising an injection channel, wherein the wall of the injection channel is designed as an injection nozzle in a first end region, and the channel wall in a second end region is surrounded by a welding region. The welding region has two welding arms extending to each welding arm end in an opposite direction perpendicular to the axis of the injection channel, particularly extending away from the channel wall in the second end region. Each welding arm is connected to the channel wall and has a plurality of rib elements spaced apart from each other in the channel axis direction. Each rib element of the first welding side has a first edge region extending between the channel wall and the welding arm end, and a second edge region extending between the channel wall and the welding arm end. The first and second edge regions form first and second welding zones converging toward the welding arm end, and a single free space is formed in each welding arm between two adjacent rib elements, each free space is open on one of the two welding sides and closed by a welding surface on the other of the two welding sides.

Description

Technology Field

[0001] The present invention relates to a pouring spout for a film bag comprising a pouring channel, wherein in a first end region, the channel wall of the pouring channel is formed by a pouring nozzle; in a second end region, the channel wall is surrounded by a welding region; the welding region has two welding arms, wherein the two welding arms extend from the channel wall in the second end region to each welding arm end in an opposite direction perpendicular to the channel axis of the pouring channel; each welding arm is attached to the channel wall and has a plurality of rib elements spaced apart from each other in the direction of the channel axis; each rib element has a first peripheral region extending between the channel wall and the welding arm end on a first welding side and a second peripheral region extending between the channel wall and the welding arm end on a second welding side; the first peripheral region and the second peripheral region form a first and second welding zone. The first and second peripheral regions or the first and second welding zones each converge in a direction toward the welding arm end. In one potential embodiment, the peripheral area / weld area may be extended at least partially in a straight line. In this case, the areas where the first peripheral area and the second peripheral area are extended in a straight line form an acute angle between them. Background Technology

[0002] Such a pour spout is known in the prior art, for example, in Publication No. 10 2017 009 693 A1 filed by the same applicant. The pour spout is provided to be welded between two film layers of a film bag containing, for example, food, particularly free-flowing food. As a result of the shapes of the surrounding regions forming the weld zone in two weld arms converging, the weld zone has a design that tapers from the channel axis toward the end of the weld arm, this design is specifically referred to as a boat shape, and the tapering occurs in a plane perpendicular to the channel axis.

[0003] Welding between the welding area and the corresponding film layer of each of the two welding sides is caused by welding energy applied to the welding area through each film layer of the film back from the two opposite welding sides by the welding machine.

[0004] Welding can be performed, for example, through thermal, inductive, ultrasonic means and other suitable welding methods.

[0005] Therefore, the weld sides are two sides facing each other in the weld area. The weld sides are located on both sides of a plane containing the channel axis and both weld arm ends. Here, the channel axis is the axis of the longitudinal extension of the injection channel that extends through the injection spout.

[0006] This plane may also be referred to as the front plane and corresponds to a plane lying parallel to the film layer of the film bag, specifically an unfilled film bag. When viewing the film bag from the front, the observer actually sees the front plane.

[0007] When the film bag is positioned vertically during use, a removable stopper, such as a cap, is typically placed at one end region that forms the upper region as an ejection nozzle. The stopper may be fastened or secured to the ejection nozzle and may be detached from the ejection nozzle via a threaded connection.

[0008] In the mentioned use, the second end region forming the welding area is the lower region of the injection spout. A collar protruding radially around the channel wall may be positioned between the injection nozzle and the welding area in the prior art and preferably also in the present invention. The protruding collar may serve as a stop for the cap and / or may include a functional component of so-called ingenuity protection, thereby indicating whether the cap is already open or at least has moved from its original closed position.

[0009] The rib element is preferably composed of a planar element. This is understood specifically as an element having two faces spaced apart by a thickness value, wherein the thickness is preferably smaller than the cross-sectional dimension of the two faces facing each other in the thickness direction. The thickness of such a planar element may be uniform throughout, but this is not mandatory in the present invention. The thickness may also vary locally.

[0010] The rib elements form the weld area mentioned at the beginning by the surrounding area and extend parallel to the upper periphery of the film bag; once welded in this manner, multiple linear fixations and seals are formed along the welded weld area of ​​the film bag located at the upper periphery.

[0011] During welding, rib elements are affected by forces acting parallel to the rib plane. To prevent the rib elements from swelling due to the influence of these forces, conventional technology has so far stabilized the rib elements by walls connecting all rib elements, preferably positioned in the aforementioned plane or front plane. Consequently, the walls are extended to be centered and perpendicular to the rib elements, resulting in two empty spaces located on either side of the separating walls, each between two adjacent rib elements.

[0012] These injection spouts are commonly found in the market and are the preferred injection molding method; they are easy to produce, easy to weld, and require a small amount of material. However, they have the disadvantage that if excessive stress is applied, the practically linear weld area is damaged, leading to leakage. In particular, solutions that provide a very large weld surface across the entire height of the weld area (when viewed along the channel axis) are actually known, but these solutions require significantly more material. The problem to be solved

[0013] Against this backdrop, the object of the present invention is to provide an injection spout of the type mentioned above that is easy to produce by an injection molding method, particularly easy to demold, and provides an extension of the surface on the welding area that can be utilized for welding to increase the material input amount only slightly or not significantly, while providing sufficient stability of the weld surface in relation to the forces acting simultaneously during the welding process. means of solving the problem

[0014] According to the present invention, this objective is achieved in that a single empty space is formed between two adjacent rib elements in each weld arm, and each empty space is open on one of the two weld sides, particularly open toward the outside, and closed by the weld surface on the other of the two weld sides.

[0015] When viewed in the direction of the channel's extension, this embodiment of each weld arm has at least two adjacent voids, particularly adjacent to each other above and below, when each weld arm has at least three rib elements arranged adjacently at regular intervals. One preferred embodiment may provide that each weld arm has exactly three rib elements, resulting in exactly two voids in each weld arm. Unlike the aforementioned prior art, the aforementioned stabilizing wall centered on the rib elements is omitted. Instead, stabilization of two adjacent rib elements is achieved by connecting the welding areas of the rib elements—that is, the peripheral areas of the rib elements that lie at least substantially above and below each other in the direction of the channel's extension—by means of a welding surface. Thus, this welding surface extends between the welding areas of the two rib elements surrounding the void, and in addition to the stabilization function, the entire surface available for welding is expanded. Unlike linear connections to date, this provides the weld with a higher load-bearing capacity while ensuring the stability of the rib elements.

[0016] A substantial advantage of the present invention is that, compared to the prior art, the entire weld surface is enlarged while using no more, or at least no substantially more, plastic material that would preferably need to be used in the injection molding process for this purpose.

[0017] In terms of configuration, an embodiment according to the present invention can be interpreted such that the original existing wall described in the introduction is displaced from the center between the previous weld zones in a direction partially toward the first weld side and partially toward the second weld side, and then the displaced wall area forms a weld face in each case. In this way, the weld faces can preferably be formed in proportion to the material occupied by the wall described in the prior art.

[0018] In one preferred embodiment, each weld arm has at least one empty space that is open at the first weld side and closed at the second weld side, in particular exactly one single empty space, and at least one empty space that is closed at the first weld side and open at the second weld side, exactly one empty space.

[0019] This preferably results in an embodiment in which the weld area on the first weld side is not configured identically to the weld area on the second weld side, which represents a significant difference compared to the prior art. In this preferred embodiment, at least one weld face, exactly one weld face closing the void on the first side, is preferably positioned to be offset in height relative to at least one, preferably exactly one single weld face, on the other weld side (when viewed in the direction of the channel extension). In a similar manner, this offset occurs in the case of at least one opening in the void on the likely mentioned weld side, thereby opening the void, in particular, outward. In subsequent applications, this opening is covered by a film layer fixed to the weld area around the opening.

[0020] This embodiment also ensures a positive demolding capability during injection molding, because the molding protrusion of the injection molding tool defining the void space can move in a direction perpendicular to the aforementioned front plane when opening and closing the injection mold.

[0021] The present invention can provide that the respective shapes of two welding arms, in particular the relative mutual arrangement of open voids and closed voids, are configured to be identical or the same on one identical welding side and differ only on the other welding side.

[0022] Regardless of the number of rib elements and the empty spaces formed between the rib elements, the present invention may provide empty spaces that are preferably adjacent in the channel axis direction, particularly those positioned adjacent to each other vertically and horizontally, which are alternately closed or opened toward the first and second welding sides.

[0023] As a result, when viewed from a first cross-sectional plane penetrating the weld arm perpendicular to the spacing direction of the weld arm end, the weld face and rib elements closing the void space preferably have a serrated profile. The cross-sectional plane perpendicular to the spacing direction of the weld arm end is preferably positioned at a certain distance from the channel axis, and in particular, the cross-sectional plane is positioned outside the main injection channel. Overall, this expands the weld face and provides a very stable structure.

[0024] A welding surface that closes the empty space between rib elements on one welding side or, alternatively, on the other welding side is positioned so that the surface of the welding surface that comes into contact with the film layer to be welded outwardly is aligned with the surrounding area of ​​the rib element forming the welding zone. As a result, on both welding sides, the welding surface and the welding zone of the adjacent surrounding area are integrated to form a weldable joint working surface.

[0025] It is desirable for the weld face closing the void to have a wall thickness that is less than or equal to the wall thickness of the adjacent rib element, and in particular, it can be provided to be smaller than the wall thickness of the rib element at the thickest location of the rib element. This also contributes to material savings without compromising weldability.

[0026] In this way, preferably, the empty space extends into the weld arm in a direction perpendicular to the front plane, for example, from an opening on one of the weld sides to the inner surface of the weld face of the opposite weld side. The opening is bounded at the top and bottom by the periphery of the rib element. At each end of the weld arm, the opening may be bounded by a thick section that extends in the channel axis direction and is positioned inside the opposite weld face.

[0027] In each weld arm, the weld zone of the rib element, at least one weld face closing the void, and in particular, the aforementioned thick portion of one weld side are preferably placed in the same plane, which is the weld plane where the weld is performed. This plane may or may not be parallel to the channel axis. In one possible embodiment where it is not parallel, the weld plane may start from below the channel axis or approach the channel axis from below.

[0028] The present invention may provide that the surface area in contact with the film layer during welding may have different surface embodiments depending on the welding method used. The contact surface is preferably a surface of the welding zone or surrounding area of ​​the welding surface that closes at least the void space, and a surface of the shell surface area that surrounds the channel axis and connects the surface area of ​​the welding arm.

[0029] These contact surfaces can preferably be formed smoothly, for example, without a structure, in the case of the conductive introduction of welding energy.

[0030] In other embodiments, these contact surfaces may also be configured to be rough, particularly having a structure, wherein the structure may preferably be of a type that provides an initial point for melting during ultrasonic welding, such as a protrusion.

[0031] For example, the structure can be positioned to be raised within a specific dimensional range, particularly within 0.02-0.05 mm, on the contact surface.

[0032] Particularly preferably, each void from the weld side closed by the weld face widens in the direction toward the weld side where the void is open, particularly in the height direction, and accordingly in the spacing direction of the rib element. The expansion of the void in the spacing direction of the weld arm end can preferably already be provided in that the weld arm tapers toward the weld arm end. As a result, demolding capability is achieved between the injection spout being produced and the mold protrusion on the injection mold defining the void.

[0033] One preferred embodiment may provide that each rib element is arranged around a cross-section perpendicular to the channel axis. The transverse plane and the front plane mentioned at the beginning are preferably perpendicular to each other. In this way, the cross-sections of different rib elements are spaced apart from each other.

[0034] In this embodiment, it is more preferable that the face of the rib element facing the empty space is inclined with respect to the cross-section in which the rib element is placed. As a result, the expansion of the open side of the aforementioned empty space can be achieved, and demolding capability can be facilitated.

[0035] A further preferred embodiment may provide a collar extending away from the rib element closest to the second end of the main injection channel, specifically the lowest rib element, to expand the weld zone / peripheral area of ​​this rib element. Since no additional rib elements can be provided below the lowest rib element, the weld zone of the lowest rib element is limited by the thickness of the peripheral area.

[0036] The integrally formed collar extends downward and aligns with the weld area. The weld area of ​​the rib element is preferably substantially expanded by at least the height of the collar, and accordingly, the rib element thickens downward, particularly at the periphery. This leads to an enhanced load-bearing capacity of the weld joint between the weld area and the film layer, precisely at the location where the greatest movement occurs between the film layer and the weld area during use.

[0037] The collar can form an elastic recovery zone that prevents the film from stretching in this area during welding.

[0038] It is particularly desirable for the lower perimeter of the outward-facing collar to have a chamfer or be implemented in a radius shape. This can also prevent stress caused by the film.

[0039] Preferably, when viewed in the channel axial direction, at least one rib element, preferably all rib elements, particularly on one or both sides of the cross-section, may be provided such that the thickness of the rib element increases in the direction toward the weld arm end and / or the height of the empty space between two rib elements when viewed in the channel axial direction decreases in the direction toward the weld arm end.

[0040] As a result, the weld plane acting in the direction toward the weld arm end is effectively increased. Furthermore, when viewed in the projection of the weld plane perpendicular to the front plane, an enlarged overlap of two weld planes positioned to be offset from each other on two weld sides occurs in the region of the weld arm end. This improves the load-bearing capacity of the weld at the weld arm end.

[0041] When viewed from the channel axis direction, the position of the empty space relative to the channel axis is equally placed on both weld arms that are closed or open toward the same weld side.

[0042] More preferably, two empty spaces that are equally spaced across the shell face area of ​​the second end region extending between the two weld arms may be connected by a groove. The height of the groove measured in the channel axis direction preferably corresponds to the height of the empty space in the same direction.

[0043] However, the present invention may also provide that such shell face areas are configured without grooves, and that shell face areas at the height level of two empty spaces of different arms have a particularly curved profile, said curved profile corresponds to the profile between the weld faces of two weld arms on the same weld side closing the empty space.

[0044] A more desirable design embodiment in terms of configuration provides that the injection channels in the welding area are positioned opposite each other with respect to the channel axis and have two mutually parallel planar / flat channel wall regions where the rib elements of the two welding arms are connected. Thus, a planar flat shape exists at least on the side of the channel wall adjacent to the rib element. Therefore, the planar flat plane of the channel wall thus faces the void space. During injection molding, demolding preferably occurs in a direction parallel to this plane. The channel wall radially inward toward the channel axis may also be configured in a configuration other than planar, and said channel wall is preferably configured in the same manner.

[0045] The main injection channel in the weld area between two mutually parallel and mutually opposing channel wall regions may have a plurality of reinforcing ribs extending radially inward from the inner surface of the channel wall. The inner surface of the channel wall between the parallel planar channel wall regions may have a curved profile and, in particular, may have a fixed radius with respect to the channel axis.

[0046] Additional embodiments that can be combined with all previously mentioned embodiments are described below.

[0047] For example, a weld surface that closes a void space may be provided to be positioned to protrude outwardly for at least one peripheral area of ​​a rib element adjacent to the weld surface, preferably for both peripheral areas of a rib element adjacent to the weld surface.

[0048] Such protruding weld surfaces are preferably located in at least regions, particularly in the region extending from the shell surface region of at least the second end region to the weld arm end, and are configured to be flat or to have a curvature extending along the second end region. In particular, they have a curvature protruding outward in the spacing direction of the peripheral region. This curvature is preferably in a plane oriented perpendicular to the extension direction of the peripheral region of the rib element extending in a straight line.

[0049] These protruding weld surfaces can form a weld material supply section that is compressed, for example, especially to the surrounding area during welding.

[0050] One embodiment may also provide that the weld face closing the empty space is positioned so as to be aligned with at least one surrounding area of ​​a rib element adjacent to the weld face, preferably so as to be aligned with both surrounding areas of a rib element adjacent to the weld face.

[0051] The weld surface and / or surrounding area may be provided in an area extending at least from the shell surface area, not only in the aligned and positioned weld surface but also in the weld surface protruding beyond the surrounding area. The second end area up to the weld arm end is configured to be planar or has curvature in a plane perpendicular to the channel axis.

[0052] This curvature can be configured so that the weld surfaces and surrounding areas in the observation plane are concave or convex toward the outside. Brief explanation of the drawing

[0053] FIGS. 1 to 4 are drawings illustrating a preferred first embodiment from different perspectives. FIGS. 5 and FIGS. 6 are drawings illustrating a second embodiment according to the present invention. FIGS. 7 and FIGS. 8 are drawings illustrating a third embodiment according to the present invention. FIG. 9 is a bottom view of an injection spout showing that the channel wall of the injection channel in the bottom region has two flat / flat walls. FIGS. 10 and FIGS. 11 are drawings illustrating an embodiment in which no collar is present. FIGS. 12 and 13 are drawings showing the configuration of an embodiment when the injection spout is viewed from below in the axial direction. FIGS. 14 and FIGS. 15 are drawings illustrating an embodiment configured such that the welded surface protrudes outward relative to the surrounding area. Specific details for implementing the invention

[0054] Preferred embodiments are described in more detail below with reference to the drawings.

[0055] FIGS. 1 through 4 illustrate a preferred first embodiment that shares features common to all other embodiments of the drawings. Features common to all embodiments are not repeated in relation to the drawings below. The drawings illustrate features according to the present invention in different aspects in each case.

[0056] The common characteristics are as follows.

[0057] The illustrated injection spout has an injection channel (1) having a longitudinal extension direction along a channel axis (1b), and the channel wall (1a) of the upper region (2a) of the injection channel (1) is composed of at least a substantially circular-cylindrical cross section and forms an injection nozzle.

[0058] The channel wall (1a) of the upper region (2a) externally supports a male screw that interacts with a cap having a corresponding female screw not shown herein and unrelated to the present invention, so that the dispensing nozzle can be selectively closed or opened. The dispensing nozzle can be covered by a cap, and is a region from which the contents of a film bag not shown herein can be removed.

[0059] The channel wall (1a) of the lower region (2b) is surrounded by a welded region (3) containing two weld arms. In this region, the surrounded channel wall does not need to match the circular-cylindrical shape seen in the upper region.

[0060] The welding area (3) is positioned in a direction opposite to the channel wall / channel axis and includes two welding arms (3a, 3b) extending away from the channel axis (1b) / channel wall (1a) in the opposite direction. One film layer of the film bag is welded to the welding arms (3a, 3b) on two opposing sides (6a, 6b) in each case, so that the welding area is surrounded between the film layers. The welding sides (6a, 6b) are positioned on both sides of an imaginary front plane that includes the channel axis (1b) and the ends of the two welding arms (4a, 4b). In this way, the front plane is positioned at the center of the injection spout and is parallel to the film layer of the film bag, which is not illustrated.

[0061] The cross-sectional views of FIGS. 3 and 4 particularly highlight that each weld arm (3a, 3b) includes multiple rib elements (5a, 5b, 5c) in this case. Potential embodiments are not limited to the three rib elements depicted. In particular, more than three rib elements may be provided, which merely extends the embodiment toward the bottom in a similar manner. The rib elements are preferably configured as planar elements and, in each case, extend around a cross section (10a, 10b, 10c) perpendicular to the channel axis (1b). The rib elements (5a, 5b, 5c) or their cross sections (10a, 10b, 10c) are spaced apart in the direction of the channel axis (1b).

[0062] In the height direction corresponding to the direction of the channel axis (1b), two adjacent rib elements (5a, 5b, or 5b, 5c) surround one empty space (8a, 8b) in each case. Each of these empty spaces (8a, 8b) occupies the gap area between the mutually facing faces of the rib elements (5a, 5b, 5c), and accordingly, each empty space is placed specifically inside one of the weld arms (3a, 3b). The relative positions of the empty spaces (8a, 8b) of both weld arms (3a, 3b) with respect to the channel axis (1b) are the same.

[0063] The cross-sectional view of FIG. 3 particularly highlights that each rib element (5a, 5b, 5c) on both weld sides (6a, 6b) has a peripheral area (7a or 7b) in each case. The peripheral area (7a, 7b) on the outer periphery extends substantially across the height of the rib element (5a, 5b, 5c) (when viewed from the direction of the channel axis (1b)). The end face of this peripheral area (7a, 7b), particularly the outward-facing peripheral area, forms a weld area alone or together with an enlarged face and serves for welding to the film layer. The perspective view of FIG. 1 highlights that the peripheral area (7a, 7b) or weld area converges in a direction toward the weld arm end. This particularly designs the weld area in a boat shape.

[0064] FIG. 4 highlights that the rib elements (5a, 5b, 5c) are integrally attached to the channel wall (1c) of the lower region (2b).

[0065] It is important in aspect of the invention that each of the two adjacent empty spaces (8a, 8b) in each welding arm (3a, 3b) is open toward exactly one of the two welding sides (6a, 6b) and is closed toward the other side by a welding surface (9) that connects the surrounding areas placed above each other and expands the welding area of ​​the surrounding area.

[0066] As can be seen in FIGS. 1 to 4, in both welding arms (3a, 3b), the upper empty space (8a) is open toward the welding side (6b) and is closed toward the welding side (6a) by the welding surface (9). In contrast, the lower empty space (8b) is conversely open toward the welding side (6a) and is closed toward the welding side (6b) by the welding surface (9). Thus, the embodiments of the two welding arms on the same welding side are identical. When there are three or more empty spaces below each other in the direction of the channel axis, the empty spaces are preferably alternately closed or opened toward one of the welding sides and another side.

[0067] The drawing of the weld arm end (4b) in FIG. 2 particularly highlights that the weld face (9) closing the upper and lower voids, or the opening where the voids are opened outward, is specifically offset on both weld sides by the height difference between the two voids. Thus, the weld area (3) around the front plane is not mirror-symmetric.

[0068] Referring to FIG. 2, during injection molding of the upper empty space (8a), the mold protrusion for forming the empty space (8a, 8b) is inserted into the injection spout from the welding side (6b) toward the welding side (6a) to the inner wall of the upper welding surface (9), and to form the lower empty space (8b), it is inserted into the injection spout from the welding side (6a) toward the welding side (6b) to the inner wall of the upper welding surface (9). Accordingly, demolding is performed in a direction perpendicular to the spacing direction of the welding arm ends (4a, 4b).

[0069] Each internal empty space (8a, 8b) is continuous without interruption from the welded surface (9) to the opposite opening, and preferably widens in this direction.

[0070] When viewed perpendicular to the front plane, the thickness of the weld face (9) is preferably smaller than the thickness of the thickest rib element (5a, 5b, 5c) when viewed in the direction of the channel axis (1b). In all possible embodiments herein, the term "welding face" is preferably understood as a functional surface for welding as well as a wall element having this functional surface.

[0071] FIG. 3 illustrates a series of rib elements (5a, 5b, 5c) and a serpentine profile of the weld surface (9) created by the opening of the outwardly facing empty spaces (8a, 8b) or the offset of the weld surface (9). The serpentine profile will continue in more cases than the two empty spaces (8a, 8b) shown. In FIG. 2, it can be clearly seen that there is no wall around the central front plane. Reinforcement of the rib elements (5a, 5b, 5c) in the direction of the channel axis (1b) occurs alternately from the outside through the outer weld surface (9), having the effect of expanding the weld area. A radially protruding collar shown around the channel wall (1a), which can serve as a stop for the cap and support the uniqueness protection element, is preferably placed between the end area (2a) and the end area (2b).

[0072] In the first embodiment of FIGS. 1 to 4, each of the two weld sides has an open empty space, for example, an empty space (8a) on the weld side (6b), which connects the two weld arms (3a, 3b) and crosses a shell face area (12) that is transferred to each other by a groove (13).

[0073] More preferably, the empty space (8a, 8b) in the externally facing opening plane has the same height everywhere.

[0074] More specifically in relation to this embodiment, the lowest rib element has a downward protruding collar (11), which particularly serves to likewise expand the weld zone and / or prevent stress from the film at this location due to higher elasticity. This collar may be omitted in other embodiments.

[0075] In contrast, FIGS. 5 and 6 illustrate a second embodiment according to the present invention without such grooves (13), and other features are the same. The shell face area (12) at the height of the opening of the empty space has a curved profile identical to the height of the weld face closing another empty space at the same weld side.

[0076] FIGS. 7 and FIGS. 8 illustrate a third embodiment having the same features as FIGS. 1 to 4, but configured without the groove (13), and having the thickness of the rib elements (5a, 5b, 5c) and the height of the empty space (8a, 8b) reduced in the direction toward the weld arm end (4a, 4b).

[0077] FIG. 8 shows that, particularly in this embodiment, the surface effectively available for welding is expanded in the direction toward the weld arm ends (4a, 4b), and in particular, as a result, an expanded overlap (14) of opposite weld surfaces (9) occurs on two weld sides (6a, 6b) compared to other embodiments in a projection perpendicular to the front plane.

[0078] FIG. 9 is a bottom view of an injection spout, which is common to the previous embodiment in that it has a collar (11), and has two planar / flat walls (1c) positioned parallel to each other in the lower region (2b) of the injection channel from the collar, with rib elements attached thereto, and the lowest part (5c) among them can be seen.

[0079] In the channel wall area between the flat walls (1c), the reinforcing rib (14) is radially inward toward the channel axis (1b).

[0080] Additionally, at the step (1d) at the height level of the collar having a uniqueness protection function, it can be seen that the injection channel (1) transitions from a cylindrical internal shape to a shape having planar parallel walls (1c). However, it should be noted that in all possible embodiments, the present invention is not limited to the internal shape of the injection channel (1) illustrated.

[0081] FIGS. 10 and FIGS. 11 illustrate an embodiment in which the aforementioned collar (11) is absent. In this embodiment, the weld area (3) facing the floor is terminated through the lower surface of the lowest rib element (5c). Unless otherwise noted, all other features described above may be implemented in this embodiment, particularly with or without the groove (13) as illustrated herein.

[0082] All drawings illustrate an embodiment in which the surrounding areas (7a, 7b) of the rib elements (5a, 5b) serving as the welding area and / or at least the extensions toward the welding arm ends (4a, 4b) in the area are arranged to be aligned with each other, so that the welding surface (9) closing the empty space (8a) extends in a straight line, particularly between each arm end (4a, 4b) and the curved shell surface area (12).

[0083] In the area between the attachment points of the rib elements (5a, 5b) to the two channel walls (1c) of the second end area (2b), the weld area, which is optionally expanded by the space-closed weld surface (9) empty by the mentioned shell face area (12), is convexly bent outward and preferably continuously transitions to one another.

[0084] For all illustrated embodiments according to the present invention, and for all potential embodiments according to the present invention not generally illustrated, the present invention is also composed of a curved profile between a shell face area (12) that is curved so as to be convex toward the weld arm end (4a, 4b) and the surrounding area (7a, 7b), particularly including a void space closing-weld face (9).

[0085] For example, in at least the area, particularly in the area extending from the shell surface area (12) of at least the second end area (2b) to the weld arm end (4a, 4b), the mutually aligned weld surface (9) and the surrounding area (7a, 7b) may have a curvature extending in a plane perpendicular to the channel axis (1b) and configured to be concave toward the outside, and in particular, this curvature is converted into a shell surface area (12) that is curved to be convex toward the outside.

[0086] FIG. 12 shows this configuration of an embodiment without a collar (11) when the injection spout is viewed axially from below. However, this configuration may also be provided in an embodiment with a collar (11), and this applies likewise to the drawings below.

[0087] In contrast, FIG. 13 shows an embodiment in which, when viewed axially from below, the weld surface (9) and surrounding area (7a, 7b) that are mutually aligned in at least the area extending from the shell surface area (12) of at least the second end area (2b) to the weld arm end (4a, 4b) have a curvature extending in a plane perpendicular to the channel axis (1b) and are configured to be convex toward the outside. In particular, this curvature is transferred to the shell surface area (12) which is curved to be convex toward the outside.

[0088] FIGS. 14 and FIGS. 15 illustrate embodiments in which, in each case, the weld surface (9) is positioned to protrude outward relative to the surrounding areas (7a, 7b).

[0089] Here, the weld surface (9) of FIG. 14 has a flat surface, and the weld surface (9) of FIG. 15 is curved outward, and in particular, is convex outward. The curvature exists in a plane oriented perpendicular to the surrounding regions (7a, 7b) that extend in a straight line. Here, the curvature proceeds in the spacing direction of the surrounding regions (7a, 7b).

[0090] It should be noted that the embodiments of FIGS. 14 and 15 may be combined with the embodiments of FIGS. 12 and 13.

Claims

Claim 1 An injection spout for a film bag comprising an injection channel (1), wherein: a. in a first end region (2a), the channel walls (1a, 1c) of the injection channel (1) are formed as injection nozzles; b. in a second end region (2b), the channel walls (1a, 1c) are surrounded by a welding region (3); c. the welding region (3) is provided with two welding arms (3a, 3b), wherein the two welding arms (3a, 3b) extend to each welding arm end (4a, 4b) in an opposite direction perpendicular to the channel axis (1b) of the injection channel (1); d. each welding arm (3a, 3b) is attached to the channel wall (1c) and is provided with a plurality of rib elements (5a, 5b, 5c) spaced apart from each other in the direction of the channel axis (1b); e. Each rib element (5a, 5b, 5c) has a first peripheral area (7a) extending between the channel wall (1c) and the weld arm end (4a, 4b) on the first weld side (6a), and a second peripheral area (7b) extending between the channel wall (1c) and the weld arm end (4a, 4b) on the second weld side (6b); f. The first peripheral area (7a) and the second peripheral area (7b) form first and second weld zones (7a, 7b) converging toward the weld arm end (4a, 4b), in an injection spout for a film bag, g.In each case, a void space (8a, 8b) is formed between two adjacent rib elements (5a, 5b / 5b, 5c) within each weld arm (3a, 3b), and each void space (8a, 8b) is open on one of the two weld sides (6a, 6b) and closed by a weld face (9) on the other of the two weld sides (6a, 6b), and each weld arm (3a, 3b) has at least one void space (8b) that is open on the first weld side (6a) and closed on the second weld side (6b), and each weld arm (3a, 3b) has at least one void space (8a) that is closed on the first weld side (6a) and open on the second weld side (6b), characterized by an injection spout for a film bag. Claim 2 delete Claim 3 A film bag injection spout according to claim 1, characterized in that empty spaces (8a, 8b) placed adjacent to each other in the direction of the channel axis (1b) are alternately closed or opened toward the first welding side (6a) and the second welding side (6b). Claim 4 In claim 3, the injection spout for a film bag is characterized in that, when viewed from a cross-section perpendicular to the spacing direction of the weld arm ends (4a, 4b) and penetrating the weld arm (3a, 3b), the weld surface (9) closing the empty space (8a, 8b) and the rib elements (5a, 5b, 5c) have a serrated profile. Claim 5 A film bag injection spout according to claim 1, characterized in that the wall thickness of the weld surface (9) closing the empty space (8a, 8b) is less than or equal to the wall thickness of the adjacent rib element (5a, 5b, 5c). Claim 6 A film bag injection spout according to claim 1, characterized in that the empty space (8a) extends in a direction toward the weld side (6b) where the empty space (8a) is open, from the weld side (6a) where the empty space is closed by the weld surface (9). Claim 7 An injection spout for a film bag according to claim 1, characterized in that each rib element (5a, 5b, 5c) is arranged around a cross section (10a, 10b, 10c) perpendicular to the channel axis (1b). Claim 8 A film bag injection spout according to claim 7, characterized in that the surface of the rib element (5a, 5b, 5c) facing the empty space (8a, 8b) is inclined with respect to the cross-section (10a, 10b, 10c) where the rib element (5a, 5b, 5c) is placed. Claim 9 A film back injection spout according to claim 1, characterized in that a collar (11) is configured to expand the welding area / peripheral area (7a, 7b) of the rib element (5c) closest to the second end of the injection channel (1) and to be directed away from the rib element (5c). Claim 10 An injection spout for a film bag according to claim 1, characterized in that, when viewed in the direction of the channel axis (1b), the thickness of at least one rib element (5a, 5b, 5c) on one side or both sides of the cross section increases in the direction toward the weld arm end (4a, 4b) and / or the height of the empty space (8a, 8b) when viewed in the direction of the channel axis (1b) decreases between the two rib elements (5a, 5b, 5c). Claim 11 A film bag injection spout according to claim 1, characterized in that, when viewed from the direction of the channel axis (1b), the position of the empty space (8a) is placed equally on both welding arms (3a, 3b) and the empty space (8a) is closed or open toward the same welding side (6a). Claim 12 In claim 11, the two empty spaces (8a) that are equally spaced across the shell face area (12) of the second end area (2b) extending between the two welding arms (3a, 3b) are connected by a groove (13), and the height of the groove measured in the direction of the channel axis (1b) corresponds to the height of the empty space (8a), characterized in that the injection spout for a film bag. Claim 13 A film bag injection spout according to claim 1, wherein in the welding area (3), the injection channel (1) has two parallel channel walls (1c) positioned opposite each other with respect to a channel axis (1b), and two welding arms (3a, 3b) rib elements (5a, 5b, 5c) are attached to the channel walls. Claim 14 A film bag injection spout according to claim 13, characterized in that the injection channel (1) in the welding area (3) between two mutually parallel and mutually opposing channel wall areas (1c) has a plurality of reinforcing ribs (14) extending radially inward from the inner surface of the channel wall. Claim 15 An injection spout for a film bag according to claim 1, wherein the welding surface (9) closing the empty space (8a, 8b) is positioned to protrude outward in relation to both peripheral areas (7a, 7b) of the rib elements (5a, 5b, 5c) adjacent to the welding surface (9), in relation to at least one peripheral area (7a, 7b) of the rib elements (5a, 5b, 5c) adjacent to the welding surface (9). Claim 16 In claim 15, the injection spout for a film bag is characterized in that the weld surface (9) protruding from the area extending from the shell surface area (12) of at least the second end area (2b) to the weld arm end (4a, 4b) is configured to a. be flat or b. have a curvature extending in the spacing direction of the surrounding areas (7a, 7b). Claim 17 An injection spout for a film bag according to claim 1, characterized in that the welding surface (9) closing the empty space (8a, 8b) is positioned to be aligned with at least one surrounding area (7a, 7b) of the rib element (5a, 5b, 5c) adjacent to the welding surface (9). Claim 18 An injection spout for a film bag according to any one of claims 15 to 17, wherein the welding surface (9) and surrounding regions (7a, 7b) are configured to have a. a planar shape or b. a curvature extending in a plane perpendicular to the channel axis (1b) in an area extending from the shell surface region (12) of at least the second end region (2b) to the welding arm end (4a, 4b).

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