JPS5845344B2 - Method of forming a bundle of tubular bags made of a plurality of paper webs and having staggered edges at one end - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves transversely perforating an individual paper web and applying adhesive in the transverse and longitudinal directions to form a tube with alternating side edges and alternating perforations. is torn along the perforation to form a tube section with staggered edges at each end, and this tube section is conveyed longitudinally, cut down the middle and divided into equal length bag sections, each bag section being divided into equal length bag sections. A tubular bag section made of a plurality of layers of paper web and subsequently processed in a bag-making machine, consisting of strips having alternating layer lines at one end and superimposed layer lines at the other end. Concerning how to form a bundle of.

Valved multi-layer paper bags with a cross-bottom, with alternating layers appearing at each end, are known, for example, from DE 1 486 706.

Bags in which the edges of several layers are staggered and are closed by a cross-bottom at one end and the edges of several layers overlap at the other end are used, for example, as rice bags.

It is for the purpose of making bags that the tube sections with alternating edges at both ends are provided with separating cuts to form individual bag sections.

However, since the bag segments are conveyed longitudinally by a conveyor, each bag segment with staggered leading edges is followed by a bag segment with an overlapping edge at the leading edge, thus creating an alternating array of bags. The pieces cannot then be processed in the bottom forming device of the bag making machine.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple method for feeding bag pieces to a bottom forming device for bag pieces having alternating edges at one end and overlapping edges at the other end.

According to the invention, the bag segments with overlapping edges at their front ends are assembled and stacked separately from the bladder segments with staggered leading edges, so that the stack, ie all the bladder segments, are stacked in the same direction. In order to orient, a stack containing similarly oriented bag pieces is oriented around an axis perpendicular and horizontal to the direction of movement of the stack.
The paper is rotated 0 degrees, after which the entire stack is transferred for further processing of the bag pieces.

According to the invention, therefore, differently oriented bag pieces can simply be stacked separately and oriented in the same direction by rotating the stack.

It is known to provide a bag section with alternating edges at both ends, with a bottom at each end, and to divide it into two bag sections by cutting it apart in the middle.

However, bags made in this way with an overlapping edge at the mouth cannot be processed further.

This known method is not used, for example, for the production of rice bags in which the open mouth is provided with a sealing tape.

This is because the device for adhering the tape to the bag must be placed in the center of the bag making machine, and the operator cannot get close to this device.

To carry out the method of the invention, the tubular bag sections can be fed alternately by one of two superimposed conveyors cooperating with a turning body.

Bag pieces of the same orientation are sent to a stack rotator common to both conveyors.

At the rotating device, the stacks containing bag sections with overlapping edges at their front ends that reach the lower conveyor pass through without rotation, while the stacks that reach the upper conveyor during a 180 degree paper rotation pass through without rotation.

All the piles are then placed in the same orientation and sent for further processing in the bottom forming device.

To describe the device according to the invention with reference to the embodiment shown in the drawings, a paper web 4, 5.6 is unwound from the respective supply reel 1.2.3 and fed to a perforation station 7, where transverse holes are made in the paper web. is drilled and two longitudinal incisions are made which are necessary for subsequent processing which is not relevant to the present invention.

The paper web 4, 5.6 reaches the glue applicator 8, where a laterally elongated length of glue is applied to the paper web at the desired location, ie at the end of the tube piece that will later be made from the paper web. administered.

The paper webs are then stacked one on top of the other and their side edges and transverse perforations are staggered.

Adhesive is applied to the side edges at the adhesive application location 9.

The adhesive application station 9 is followed by a tube-forming station 10, where a three-layer tube is made from the three polymerized paper webs 4, 5.6 and transported by several pairs of feed rollers 11 to a cutting station 12. It will be done.

The cutting station 12 has several pairs of cutting rollers 13, 14 and a drum 15 with transverse cutting knives.

Several pairs of cutting rollers tear said tubes into tube sections, which are completely cut by the cutting knives of the drum 15 and separated into two identical bag sections.

Bag segments with fully overlapping leading edges are pulled by a pair of feed rollers 16 (FIG. 2), alternating with strip segments having staggered leading edges.

The bag pieces are directed alternately by means of deflectors 17 onto one or the other of the two heavy belt conveyors 18.19, creating a stacking stage at each of the stacking devices 20.21.

One of the stacking devices therefore only receives bag sections with overlapping leading edges, and the other stacking device only receives bag sections with staggered leading edges.

In front of the stacking device 20.21 there are brake devices 22.23, which are activated when the stack of bag pieces reaches a predetermined height or when a predetermined number of bag pieces is reached.

The braking device delays or stops the arrival of the bag sections to be polymerized and the finished stack is removed from the stacking device 20.21.

The removal of the piles is carried out by belt conveyors 24, 25, the upper conveyor 24 transporting the piles to the stacking device 21.
Finally, the stack of bag pieces reaches a rotating station 26, where the stack of bag pieces with staggered leading edges is Passing without rotation, the stack of bag pieces with overlapping leading edges is rotated 180 degrees about a horizontal axis perpendicular to the direction of movement of the bag pieces.

During rotation of the stack of bag pieces, the upper roller track is lowered onto the stack.

The entire pile thus becomes similarly oriented bag pieces and is sent to a bottom forming device (not shown) where the bag pieces are further processed by known means.

[Brief explanation of the drawing]

The drawing is a schematic representation of one example of the invention, and FIGS. 1 and 2 are side views of the apparatus for making the bag pieces when they are joined laterally. 4.5.6... Paper web, 7... Perforation location, 8... Adhesive applicator, 9...
Adhesive application location, 10...Pipe formation location, 11.
...Feed roller, 12... Cutting location, 1
3.14... Cutting roller, 15... Drum, 16... Feed roller, 17...
Turning body, 18, 19... Belt conveyor, 20
, 21... stacking device, 24.25...
・Belt conveyor, 26...Rotation location.

Claims (1)

[Claims] 1 The individual webs are perforated laterally and glued laterally and longitudinally to form a tube with staggered side edges and staggered perforations, which is split along the perforations and has staggered holes at each end. forming a tube section having edges, transporting the tube section longitudinally and dividing it into equal length bag sections by cutting down the center;
A tubular shape made of multiple layers of paper web and later processed in a bag-making machine, with each bag segment having alternating layer lines at one end and overlapping layer lines at the other end. In a method of forming a bundle of bag pieces, bag pieces having overlapping leading edges are separated and stacked from bag pieces having staggered leading edges, so that all the piles are oriented in the same direction. A method characterized in that the stack containing the oriented bag pieces is rotated 180 degrees about an axis perpendicular and horizontal to its direction of movement and then the entire stack is transferred for further processing of the bag pieces.