EP1602475A1 - Method of obtaining a continuous mesh tube which is used to produce high-strength bags and tube thus obtained - Google Patents
Method of obtaining a continuous mesh tube which is used to produce high-strength bags and tube thus obtained Download PDFInfo
- Publication number
- EP1602475A1 EP1602475A1 EP04713914A EP04713914A EP1602475A1 EP 1602475 A1 EP1602475 A1 EP 1602475A1 EP 04713914 A EP04713914 A EP 04713914A EP 04713914 A EP04713914 A EP 04713914A EP 1602475 A1 EP1602475 A1 EP 1602475A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheets
- tubular element
- tubes
- mesh
- tabs
- 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- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2155/00—Flexible containers made from webs
- B31B2155/002—Flexible containers made from webs by joining superimposed webs, e.g. with separate bottom webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B2160/00—Shape of flexible containers
- B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
Definitions
- the present invention refers to a process for obtaining a continuous tubular element of mesh with the participation of extruded mesh, the body being intended for forming bags of great resistance in order to contain within them considerable weights, for example around 15 to 20 kg.
- the invention also concerns the continuous tubular element of mesh obtained with said process, which is especially indicated for packaging and transporting mussels or other similar objects which, due to the presence of the cutting edges of their valves, require an extruded mesh of greater thickness in order to prevent rips or tears in the bags.
- the process proposed by the invention successfully solves the drawbacks set forth above allowing obtaining a tubular element that is capable of receiving considerably greater stresses and without any drawbacks occurring throughout its manufacture despite using thicker meshes.
- the process also uses a band or strip and an extruded mesh as raw materials.
- the band may be presented in two different forms: a fold, that is, with a bellows created in the extrusion winding process, or rather from two slightly wider independent sheets, given that the bellows fold is not folded down.
- These bands could either be printed or not on their outer and inner sides, whereas the folded tubular element can only be printed on their outer side.
- the extruded mesh can in turn be a tubular element of mesh, which is cut longitudinally in two half-tubes of equal or similar size, or may rather be two flat sheets of mesh which are folded along their longitudinal axis creating two half-tubes of equal or similar size, using one type or the other according to the hardness of the material, which will be in any case thicker than usual, so that they can resist the greater stresses they must endure.
- Figure 1 starts from a reel (1) of a tubular element (2) provided with a fold, that is with a bellows (3) created in the reeling process, subjecting said flat tubular element (2) in an immediate operating phase, to cutting along the mid plane of its bellows (3) by means of the action of a couple of cutting elements (4), until obtaining two independent sheets (2-2'), each one of them with their edges or marginal areas (5) bent inwards, due to the effect of plastic memory of the material forming said tubular element (2).
- the extruded mesh also in the shape of a flattened tubular element (6), is supplied by another reel (7) at the exit of which said flattened tubular element (6) is cut (8) along its mid line with the action of a cutting mechanism (9), defining two half-tubes (6-6') which along their path (10) on the installation will be subjected to a progressive opening by the effect of wedges of variable and increasing angles until the position (11) in which the half-tubes (6-6'), forming angles close to 90° and oriented with their concavities opposite one another, i.e. with said concavities facing outwards, place their openings at the level of the orthogonal bends (5) of the sheets (2-2'), which rest on outer seatings (12).
- tubular elements with greater thickness in the materials, and accordingly more resistant are obtained without this meaning any kind of manufacturing problem for the same, in which their integrating parts (2-6) would be fixed by means of considerably more robust welds (16) in which, specifically the mesh (6) is encased by two layers of sheet, which also decisively collaborates in an increase in the structural rigidity of the bag or tubular element, capable of withstanding very significant stresses.
Landscapes
- Making Paper Articles (AREA)
- Bag Frames (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Starting from, for example, a tubular element (2) made of flattened continuous
plastic, with a fold or bellows (3), said tubular element (2) is split in half by means of
cutting (4) forming two notably equal sheets (2-2') provided with tabs (5) bent inwards.
In parallel with this, a tubular element of extruded mesh (6) is also subjected to cutting
(8) along its mid plane, determining two half-tubes (6-6') having dihedral configuration
and opposing concavities, which are introduced between the sheets (2-2') such that
arranged in the peripheral areas (14) of the former are the proximities of the tabs (5) of
the latter, these tabs (5) being then folded inwards and the assembly being subjected
to a welding element (15) determining four robust welds (16) in each of which the edge
of the extruded mesh is perfectly fixed between two layers of continuous plastic, so that
the tubular element obtained, flat and with inner folds, provides a high degree of
mechanical resistance against the inner stresses it must endure in a working situation.
Description
- The present invention refers to a process for obtaining a continuous tubular element of mesh with the participation of extruded mesh, the body being intended for forming bags of great resistance in order to contain within them considerable weights, for example around 15 to 20 kg.
- The invention also concerns the continuous tubular element of mesh obtained with said process, which is especially indicated for packaging and transporting mussels or other similar objects which, due to the presence of the cutting edges of their valves, require an extruded mesh of greater thickness in order to prevent rips or tears in the bags.
- The same applicant is the proprietor of Spanish patent of invention with application number 200102600, in which a procedure for obtaining a continuous tubular element of mesh for forming bags for fruit and vegetable products and the like, as well as the continuous tubular element obtained by means of said process, are disclosed.
- The solution of this patent, although perfectly valid for packaging products of reduced weight and rounded surfaces, for which the mesh does not require great thickness, leaves a lot to be desired when dealing with heavier products or with products having cutting edges, its drawbacks being centred on the following aspects:
- When using a thicker mesh, the half-tubes obtained when longitudinally sectioning the reticulated tubular element of mesh tend to recover their original shape (excessive rigidity) due to plastic shape memory, which hinders the fold, that is, with the bellows inwards.
- The longitudinal welds between the extruded mesh and the strips of plastic material are simple and therefore weak for supporting heavy weights, with a high probability of tears in the bag at the level of said joining areas between the extruded mesh and the continuous strip.
- The process proposed by the invention successfully solves the drawbacks set forth above allowing obtaining a tubular element that is capable of receiving considerably greater stresses and without any drawbacks occurring throughout its manufacture despite using thicker meshes.
- To this end, and more specifically, the process also uses a band or strip and an extruded mesh as raw materials. The band may be presented in two different forms: a fold, that is, with a bellows created in the extrusion winding process, or rather from two slightly wider independent sheets, given that the bellows fold is not folded down. These bands could either be printed or not on their outer and inner sides, whereas the folded tubular element can only be printed on their outer side. For its part, the extruded mesh can in turn be a tubular element of mesh, which is cut longitudinally in two half-tubes of equal or similar size, or may rather be two flat sheets of mesh which are folded along their longitudinal axis creating two half-tubes of equal or similar size, using one type or the other according to the hardness of the material, which will be in any case thicker than usual, so that they can resist the greater stresses they must endure.
- For the purpose of achieving a tubular element with a section tending towards a rectangle, in which two opposing walls are made of mesh and the other two are completely closed, the process focuses its features on the following aspects:
- The half-tube of extruded mesh are placed with their concavities facing outwards, which means a tendency of the obtained product to be folded with the bellows inwards, further allowing total control of the position of the strips when they enter the packaging machine and facilitating closure of the bag opening, given that it eliminates the classic accompanying plates that form the bellows.
- This inverted position of the half-tubes makes the tubular element have a tendency to close upon itself, due to the polyethylene memory, being easily controllable by means of a rectangular-prismatic wedge coupled inside it.
- Deriving from this new arrangement in half-tube form is the possibility of using two guides fixed to the chassis in comparison to the conventional floating guide, which greatly favours the formation and welding process.
- According to an essential feature of the invention the continuous bands or strips are oversized in width such that they fold upon themselves, enclosing the edges of the extruded mesh strips such that during the subsequent welding three layers of material are achieved in correspondence with the joining lines between the parts, which considerably reinforces the structural resistance of the bag obtained.
- In order to complement the description being made and for the purpose of aiding to better understand the features of the invention, according to a preferred practical embodiment thereof, a set of drawings is attached as an integral part of said description in which, with an illustrative and non-limiting character, the following has been shown:
- Figure 1 shows the different sequences of the procedure for obtaining a continuous tubular element of mesh for forming bags of great resistance performed according to the object of the present invention, together with the schematic representation of an installation for carrying out the same, which is represented in a plan view.
- Figure 2 shows a representation similar to that of the previous figure, but in which said installation is represented in a side view.
-
- To obtain the closed strip or band, the practical embodiment of Figure 1 starts from a reel (1) of a tubular element (2) provided with a fold, that is with a bellows (3) created in the reeling process, subjecting said flat tubular element (2) in an immediate operating phase, to cutting along the mid plane of its bellows (3) by means of the action of a couple of cutting elements (4), until obtaining two independent sheets (2-2'), each one of them with their edges or marginal areas (5) bent inwards, due to the effect of plastic memory of the material forming said tubular element (2).
- In parallel, the extruded mesh, also in the shape of a flattened tubular element (6), is supplied by another reel (7) at the exit of which said flattened tubular element (6) is cut (8) along its mid line with the action of a cutting mechanism (9), defining two half-tubes (6-6') which along their path (10) on the installation will be subjected to a progressive opening by the effect of wedges of variable and increasing angles until the position (11) in which the half-tubes (6-6'), forming angles close to 90° and oriented with their concavities opposite one another, i.e. with said concavities facing outwards, place their openings at the level of the orthogonal bends (5) of the sheets (2-2'), which rest on outer seatings (12).
- Immediately after this there are pulleys (13) causing the tabs (5) of the plastic sheets (2-2') to fold inwards, enclosing the peripheral areas (14) of the half-tubes (6), so that the welding elements (15) come immediately into action which, acting on the support dollies (12), define the final welds (16) of the continuous tubular element, which when the aforementioned wedges are removed adopts the flattened position shown in the last sequence (17) of the figures, in order to finally pass towards the winding reel (18) where it remains in conditions for being used as a means for packaging the aforementioned products.
- Thus, according to the object of the invention, tubular elements with greater thickness in the materials, and accordingly more resistant, are obtained without this meaning any kind of manufacturing problem for the same, in which their integrating parts (2-6) would be fixed by means of considerably more robust welds (16) in which, specifically the mesh (6) is encased by two layers of sheet, which also decisively collaborates in an increase in the structural rigidity of the bag or tubular element, capable of withstanding very significant stresses.
Claims (2)
- A process for obtaining a continuous tubular element of mesh for forming bags of great resistance, characterised in that it comprises:a) using two continuous closed plastic sheets (2-2') and providing them with bent tabs (5) in correspondence with their edges, or rather using a continuous tubular element (2) of similar features with a fold (3), that is, with a small inner bellows at a mid-level of which a cutting operation (4) is performed in order to transform it into two notably equal parts,b) incorporating between the two mentioned sheets (2-2') two half-tubes (6-6') of extruded mesh, preferably obtained from a planar tubular element (7) split in two by means of a mid cutting line (8), the half-tubes (6-6') being placed between the sheets (2-2') with their concavities opposite one another, that is, facing outwards,c) acting on the concavities of said half-tubes (6-6') of mesh with respective wedges of increasing angle, until an extreme situation in which said half-tubes (6-6') adopts a dihedral configuration tending towards a right angle, and in which their peripheral areas corresponding to their openings are placed in adaptation to the inner side of the sheets (2-2') and immediately within the tabs (5) of the latter,d) folding inwards of said tabs (5) of the sheets (2-2'), towards the inside of the dihedral half-tubes (6-6') with the collaboration of pulleys (13) or other suitable pressure means,e) fixing by heat-welding elements (15) of the peripheral areas (14) of the half-tubes (6-6') of mesh between the sheets (2-2') and their corresponding bent tabs (5).f) Removing the wedges and folding the half-tubes (6-6') to a location of maximum proximity between sheets (2-2'), configuring a flattened tubular element wound in reel form (18)
- A tubular element obtained by means of the process of claim 1, characterised in that participating in said process are two continuous plastic sheets (2-2') or bands arranged between which are two mesh parts (6-6') with a dihedral configuration and with their concavities oriented outwards, said sheets (2-2') having their peripheral areas forming tabs (5) which are folded inwards enclosing the peripheral areas (14) of the half-tubes (6-6') of mesh, establishing in these areas joining welds (16) between the two types of parts (2-6) determining a triple layer, specifically of two outer layers of continuous plastic and an intermediate layer of extruded mesh.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200300478 | 2003-02-27 | ||
ES200300478A ES2246101B1 (en) | 2003-02-27 | 2003-02-27 | PROCEDURE FOR OBTAINING A CONTINUOUS MESH TUBULAR FOR THE FORMATION OF HEAVY DUTY AND TUBULAR BAGS OBTAINED BY MEANS OF THIS PROCEDURE. |
PCT/ES2004/000081 WO2004076162A1 (en) | 2003-02-27 | 2004-02-24 | Method of obtaining a continuous mesh tube which is used to produce high-strength bags and tube thus obtained |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1602475A1 true EP1602475A1 (en) | 2005-12-07 |
Family
ID=32921766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04713914A Withdrawn EP1602475A1 (en) | 2003-02-27 | 2004-02-24 | Method of obtaining a continuous mesh tube which is used to produce high-strength bags and tube thus obtained |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1602475A1 (en) |
ES (1) | ES2246101B1 (en) |
WO (1) | WO2004076162A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106629201A (en) * | 2017-02-09 | 2017-05-10 | 上海小松包装机械有限公司 | M plate type thin film splitting guide device for packaging machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2284340B1 (en) * | 2005-08-17 | 2008-09-16 | Preformados Tubulares, S.L. | CONTINUOUS TUBULAR FOR THE FORMATION OF HORTOFRUTICOLAS PRODUCT CONTAINER BAGS. |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9207558U1 (en) * | 1992-06-04 | 1992-10-29 | Imer, Rodney Haydn, Dipl.-Ing., 4000 Düsseldorf | Packaging bags for liquid, pasty and granular substances |
IT242331Y1 (en) * | 1996-02-07 | 2001-06-14 | Netpack S R L | BAG STRUCTURE IN PLASTIC SHEET AND NETWORK FOR THE CONTAINMENT OF BULK PRODUCTS, IN PARTICULAR OF FRUIT AND VEGETABLES. |
ES1037623Y (en) * | 1997-06-23 | 1999-02-16 | Meseguer Cristobal Sa | BAG FOR HORTOFRUTICOLAS AND SIMILAR PRODUCTS. |
ES2157785B1 (en) * | 1999-05-10 | 2002-02-16 | Olaechea Rosalina Paniagua | PERFECTED BAG, FOR HORTIFRUTICOLAS PRODUCTS. |
US6517660B2 (en) * | 2000-11-30 | 2003-02-11 | Illinois Tool Works Inc. | Method of forming gusseted reclosable bags |
TW526160B (en) * | 2001-01-21 | 2003-04-01 | Luen Sing Tang | Package |
ES2192962B1 (en) * | 2001-11-23 | 2005-02-16 | Iniciativas Barlar, S.L. | PROCEDURE FOR OBTAINING A CONTINUOUS MESH TUBULAR FOR THE FORMATION OF BAGS FOR HORTOFRUTICOL AND SIMILAR PRODUCTS, AND TUBULAR OBTAINED BY MEANS OF THIS PROCEDURE. |
-
2003
- 2003-02-27 ES ES200300478A patent/ES2246101B1/en not_active Expired - Fee Related
-
2004
- 2004-02-24 WO PCT/ES2004/000081 patent/WO2004076162A1/en active Application Filing
- 2004-02-24 EP EP04713914A patent/EP1602475A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2004076162A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106629201A (en) * | 2017-02-09 | 2017-05-10 | 上海小松包装机械有限公司 | M plate type thin film splitting guide device for packaging machine |
Also Published As
Publication number | Publication date |
---|---|
ES2246101A1 (en) | 2006-02-01 |
WO2004076162A1 (en) | 2004-09-10 |
ES2246101B1 (en) | 2007-03-16 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20050922 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PREFORMADOS TUBULARES, S.L. |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20150901 |