WO2010010205A1

WO2010010205A1 - Method, fabrics and machines for producing seamless bags and similar items

Info

Publication number: WO2010010205A1
Application number: PCT/ES2009/000361
Authority: WO
Inventors: Marcos Guash Pubill
Original assignee: Marcos Guash Pubill
Priority date: 2008-07-22
Filing date: 2009-07-10
Publication date: 2010-01-28
Also published as: WO2010010205A4; WO2010010205A8; CN102105364A; EP2305571A1

Abstract

The invention relates to a method, fabrics and machines for producing seamless bags and similar items. The method is characterised in that a weaving loom is used to weave two independent stacked fabrics which are joined transversely at pre-determined distances by interlinking warp threads using weft threads. Simultaneously, independent bands with corresponding selvages along the longitudinal edges thereof are formed in the warp direction in the weaving loom and, subsequently, said bands are fully or partially punched in order to form the bag or similar item. According to the invention, the area between the transverse and longitudinal selvages of one the fabrics to be used includes connecting zones with floating warp threads and connecting zones with floating weft threads. The machine includes means for pulling, tightening and aligning the fabric and means for cutting same in a curved or angular transverse manner.

Description

DESCRIPTION

Procedure, fabrics and machines for obtaining bags and the like without any sewing. BACKGROUND OF THE INVENTION

There are different models of bags made of different materials, being the most used plastic, fabrics and paper, which are obtained with different procedures. Plastic bags are very economical and easy to manufacture by welding and die-cutting, and are generally used for single use, for example, when shopping in establishments, mainly in supermarkets and similar stores, said degradable material not being a serious Problem as waste.

Paper bags, although their manufacture is more complex, are also economical but not resistant, so their use is limited.

As for the woven bags, they are the most ecological and have remarkable resistance, however they have the handicap of their high price due mainly to the cutting and sewing operations in their preparation.

SUMMARY OF THE INVENTION

The object of the invention is a process, fabrics and machines for obtaining bags and the like without any sewing. This procedure allows to obtain the bags or the like directly on the loom with a phase die cutting, which results in a low cost that allows to compete with those of plastic material, and can be used as a single use, however given its constitution can be used several times.

The procedure contemplates the operation of weaving two superimposed independent fabrics, which are joined together transversely by interlocking the warp threads at predetermined distances using weft threads, at the same time in the direction of the warp bands are formed in the loom independent with the corresponding selvedges on the longitudinal edges, whose bands are subsequently subjected to a total or partial die cut determining the bag or the like.

In punching, the bag or the like will be obtained with the shape of interest, for example with or without handles, but there will always be a punch in a transverse direction, which can be intermittent or continuous, obtaining in the first case bands of bags separable by the own user and that can be marketed in rolls, and in the second case you will get loose units that can be stacked and sold for example in boxes. This procedure also provides a screen printing operation to particularize the bags with the desired motives.

One of the fabrics to be used is constituted by two independent superimposed fabrics interwoven in transverse and longitudinal stripes determining edges between which There are joining areas with floating warp threads and joining areas with floating weft threads.

From this fabric, bands are formed with cross-linking areas with floating warp threads that are installed on the machine wound to make the bags.

In this machine, at least one tissue reel is installed and comprises means for dragging, tensioning and aligning the fabric, means for transverse and angular or curved cutting, and means for stacking the manufactured bags.

The means for dragging, tightening and aligning the fabric consist of a transverse barbed comb that is inserted into the zones with floating warp threads and that is movable and retractable, running motorized below a platform with longitudinal slits on which it is dragged the tissue. The means for cross-cutting consist of a pneumatic execution cylinder carrying an electric cutter, with which a pneumatic ram that maintains the tensioning of the tissue collaborates.

The stacking means comprise a receiving tray with reciprocating and vertical movements to which the bags arrive and where they are deposited.

These and other characteristics will be better derived from the detailed description that follows, to facilitate which is accompanied by five sheets of drawings in which some practical cases of realization that are cited only to Example title not limiting the scope of the present invention.

In the drawings:

Figure 1 shows in plan the formation of the double fabric with the longitudinal bands and their edges and with their transverse joints. Figure 2 and 3 schematically indicate the cutting of the bands along lines II-II and III-III respectively in Figure 1, Figure 4 shows in plan the cross-cutting of the bands, Figures 5 and 6 correspond to the bag obtained already its longitudinal section by the line VI-VI, respectively, figure 7 shows in plan the transverse die cut together with other die cuts to form a bag with handles, figures 8, 9 and 10 correspond to the bag with handle and its cut longitudinally along the lines AB and CD, respectively, figure 11 represents in perspective a roll of bags in which the transverse die cuts are intermittent, figure 12 schematically shows in side elevation the die cutting of the bands being stacked on top of each other, and Figure 13 represents the stacked bags housed in a box. Figures 14 and 15 show respectively, one of the fabrics used and the band that is obtained from it that will be wound for installation in the machine, figure 16 illustrates in perspective the machine for manufacturing the bag, with the fabric of figure 14. figure 17 represents in perspective the detail of the barbed comb, figure 18 indicates in perspective the platform on which the tissue, and Figure 19 is a perspective of an example of the means for angular or curved tissue cutting. DESCRIPTION OF A PREFERRED EMBODIMENT

According to the drawings, the process object of the invention for obtaining bags and the like of fabric without any sewing, consists of weaving on a loom of any type, for example sulzer, airjet, ketten and raschel, two independent fabrics (1 and 2) overlays that at predetermined distances (x) are joined transversely by interlocking the warp threads using threads

(3) of the plot. At the same time on the loom, independent bands (4) are formed in the direction of the warp, presenting their longitudinal edges topped with the corresponding selvedges (5).

These bands (4) at the exit of the loom or in a subsequent process are subjected to a transverse die cut (6) (figure 4), determining the bag (7) (figure 5) with the mouth (8) using for example a rotary cylinder or a "flat guillotine".

In the case of figure 7 the transverse die cut (6 ') is carried out in the area where the two fabrics with threads (3) of the weft are connected and complements with other arched cuts (9, 10 and 11) handles determinants (12 and 13) for the bag (7 ').

Figure 11 illustrates an already punched band but that the cross-section (6 ") is partial (intermittent) whereby the bag assembly can be rolled up forming a coil (14) from which the bags can be separated, a one, by the user himself In this case the bobbin (14) can be arranged for example in a vending machine The die cutting phase can also be carried out by extending the tissue from a bobbin (16) along a table (M ) (Figure 12) forming several layers (18) one on top of the other, making the cut in several areas (17) coinciding in each layer, obtaining blocks or blocks of bags already cut one on top of another.

The bags, both the (7) without handles and the (7 ') with handles, either in coils or stacked, can be dispensed in boxes (15) with the characteristics that are convenient (Figure 13).

The bags can be customized by giving them motifs (19), whether ornamental or distinctive, for which they will undergo a screen printing operation.

(20) for example by transfer or laser, which can be done at the time of die cutting, in the case of the process according to Figures 4 and 7, or before the die cutting, in the case of Figure 12.

In the illustrated case, with the procedure bags with or without handles are obtained, however with the same procedure you can obtain similar products such as bags, packages and covers in general, for example for pillows.

The bags can be obtained in either uniform colors or by combining several of them to give them a more original look, for which yarns dyed with the predetermined colors will be arranged on the loom.

According to figure 14 of the drawings, the fabric used for the manufacture of bags is constituted by a double disjointed fabric (1, 2) with a weft-free advance with floating warp threads (3 ') (fabric width) and with clearings of empty comb with floating weft threads (3 ") (length of the fabric) that join the edges (5) of the double fabric of this fabric, bands (B) are cut longitudinally (figure 15) by the floating weft threads ( 3") .

The machine (21) comprises a support (22) where four superimposed coils (23) are formed (formed by bands (B) of fabric) which are centered to specify the location of the edges (5) facing the cross-section and to the final stack. For said centering, photoelectric sensors (24) are provided that give the signal to two electric linear actuators (25) with guided endings, with built-in limit switches, the driving part comprising a linear bearing (26).

A adjustable brake system (not shown) is provided on the bobbin holders, which will be used in the event that the coil has an inertia greater than the stretch. The photoelectric sensors (24) are incorporated into liner assemblies (27) that graduate the tissue tension in each coil.

The means for dragging, tightening and aligning the fabric comprise a barbed comb (28) (figure 17) that is introduced into the zones with floating warp threads (3 ') and which is movable by linear guides (29) to double circulation of balls (30) by the action of a servomotor motor (31), which incorporates an encoder inside obtaining a precision in the stop, and to which a reducer (32) is coupled.

The barbed comb (28) is also retractable by the action of pneumatic cylinders (33 and 34) of parallel execution.

For the search by the barbed comb (28), in the zone of floating warps (3 ') a weft thread (T) of different color detected with a photoelectric sensor (35) of optical fiber incorporated in the barbed comb (28) (figure 17), which runs under a platform (36) (figure 18) with longitudinal slits (37) for the passage of the comb barbs and on which the tissue is dragged, presenting said platform a window (38) through which the photoelectric sensor (35) acts. The comb (28) once the mark formed by the weft thread (T) arrives ascends to drag the tissue, then an end of stroke sensor is activated

(39) which stops the drag and a pneumatic ram (40) maintains the tension of the stretch by subsequently lowering the barbed comb (28) to then proceed to the cross-section through the center of the threads of floating warp (3 ') by means of a pneumatic execution cylinder (41) carrying an electric cutter.

The stacking means of the manufactured bags (BO) comprise a motorized receiving tray (42), with reciprocating movements on a base (43) (figure 16) and vertical by guides (44) and with a drop sensor (45 ), which reach the bags delivered from a transport belt (46) motorized on two end rollers (47 and 48), and synchronized with the receiving tray (42).

An alternative to the conveyor belt (46) consists of the arrangement of four pneumatic clamps (49) on the sides of the platform (36) (figure 18) that will hold the bags laterally and conduct them and deposit by gravity on the receiving tray (42).

The angular or curved cutting can be done using different systems advantageously incorporated into the machine and arranged before the stacking means.

An example of the cutting system could be the one shown in Figure 19, which comprises rotary disc electric cutters (50) driven by pneumatic cylinder (51) without a rod with end-of-stroke damper, or driven by an electric motor and pulleys; with reference (52) a tray comprising the cutting means and the guides (53) of movement of said means is indicated. The handles of the bag (BO) are determined with the angular or curved cut (C). It is understood that the system cutting to obtain the handles of the bag can be any other, for example by a bridge die using a motorized band at the bottom.

Claims

1. Procedure for obtaining bags and the like of fabric without any sewing, characterized in that in a loom two independent superimposed fabrics are woven which are joined together transversely at predetermined distances by interlocking the warp threads using weft threads, at the same time, in the direction of the warp, independent bands are formed on the loom with the corresponding selvedges at the longitudinal edges, the bands of which are subsequently subjected to a total or partial determining of the bag or the like.

2. Procedure for obtaining bags and the like of fabric without any sewing, according to claim 1, characterized in that the punching in the transverse direction is intermittent allowing the user to separate the bags or the like that he needs.

3. Procedure for obtaining bags and the like of fabric without any sewing, according to claim 1, characterized in that the cutting in a transverse direction is continuous obtaining bags or the like in loose units.

4. Procedure for obtaining bags and the like of fabric without any sewing, according to claims 1 to 3, characterized in that at the time of punching, the bag is printed with the desired motifs.

5. Procedure for obtaining bags and similar fabric without any sewing, according to claim 1 characterized in that at the exit of the loom the bands are arranged in layers one on top of the other, coinciding with the areas that are desired to die, obtaining with the punching bag heels one on top of the other.

6. Procedure for obtaining bags and the like of fabric without any sewing, according to claim 5, characterized in that before stacking the bands they are subjected to the screen printing operation of the desired motifs in the bags or the like.

7. Fabric for the manufacture of bags, according to the method of claim 1, characterized in that it is constituted by two independent fabrics superimposed interwoven in transverse and longitudinal strips determining edges between which there are joining areas with floating warp threads and joining areas with floating weft threads.

8. Fabric for the manufacture of bags, according to claim 7, characterized in that the transverse joining areas have a no-weft advance of the floating warp threads, and the longitudinal joining areas have empty comb clearings determining the weft threads floating.

9. Fabric for the manufacture of bags, according to claim 7, characterized in that it forms a band with transverse joining areas with floating warp threads.

10. Bag making machine, with the fabric of claim 7, characterized in that from at least one tissue coil comprises means for dragging, tensioning and aligning the fabric, and means for transverse and angular or curved cutting.

11. Bag making machine according to claim 10, characterized in that it comprises means for stacking the manufactured bags.

12. Bag making machine according to claim 10, characterized in that the means for dragging, tightening and aligning the fabric consist of a transverse barbed comb that is inserted into the zones with floating warp threads and which is movable and retractable, running motorized below a platform with longitudinal slits on which the tissue is dragged.

13. Bag making machine according to claim 12, characterized in that it comprises a sensor that detects a weft thread of different color to determine the area of the fabric where the barbed comb is to be introduced.

14. Machine for making bags, according to claim 10, characterized in that the means for cross-cutting consist of a pneumatic execution cylinder carrying an electric cutter, with which a pneumatic tamper that maintains tissue tensioning collaborates.

15. Bag making machine according to claim 11, characterized in that the stacking means comprise a receiving tray with reciprocating and vertical movements to which the bags arrive by delivery from a motorized transport band and synchronized with the receiving tray.

16. Machine for making bags, according to claims 11, 12 and 15, characterized in that the stacking means comprise on the sides of the platform on which the fabric is dragged pneumatic clamps that hold the bags laterally and conduct them and deposit on the receiving tray

17. Bag-making machine according to claim 10, characterized in that the means for angular or curved cutting comprise rotary disk electric cutters driven by pneumatic cylinders.

18. Machine for making bags, according to claims 10 and 12, characterized in that the fabric coils are arranged centered in superposition and are guided by photoelectric sensors towards tissue tensioners that line it towards the drag platform of the superimposed fabrics.