RU2631695C1 - Method of packaging viscous product into three-shear seals from thermoplastic polymer film and packaging and film machine of vertical execution, implementing the method - Google Patents

Abstract

FIELD: packaging industry.

SUBSTANCE: method of packing a viscous product is carried out in a vertical packaging machine and comprises a film drawing, forming an open-topped packet by thermal film welding to form a longitudinal seam forming the sleeve and a transverse seam. In this case, when the product is filled with a product, the product supply nozzle is cut at the product level in the package or below this level by matching the transfer speed with the filling rate of the package product, and after stopping the filling of the product, additional broaching is carried out, then a transverse seam is formed and the bag is separated from the sleeve. The invention is also a packaging machine for carrying out the process.

EFFECT: improving quality by eliminating air bubbles in the product.

3 cl, 5 dwg

Description

The group of inventions (the method of packaging and the packaging and packaging machine that implements it) relates to packaging technology and can be used in packaging for the retail sale of chemical products. In particular, the invention relates to packing and packaging in three-seam bags (stick bags) of pasty products, gels, mastics and other viscous products extruded during compression of the packages.

Numerous methods are known from the prior art for packaging products in stick bags and designs of vertical packaging machines (apparatuses) in which doses of the product are packaged and at the same time hermetically packed in bags that are formed from a roll polymer heat-sealable film.

Known Filling and packaging vertical apparatus described in patent RU No. 2129972, publ. 05/10/1999. The apparatus comprises a frame onto which a reel of heat-sealable film is mounted, a tape drive with a braking unit, a material supply pipe, a sleeve former (the so-called collar), and a dispenser with a hopper mounted above it. A spring-loaded upper iron is installed on the feed pipe under the dispenser to form a longitudinal seam on the film rolled into a sleeve, a film sleeve broaching unit mounted with the possibility of vertical reciprocating movement, and a two-piece lower iron with a spring-loaded cutting element. The apparatus has five pneumatic cylinders mounted on the frame, the rods of which are respectively connected to the dispenser, the upper iron, the knot of the sleeve of the film and with each part of the lower iron. The knot of the sleeve of the film has arcuate jaws that fit snugly on the film when the working agent is fed into the cavity of the housing, extending the rods with jaws. The device is intended for the packaging of bulk material and is not applicable for the packaging of liquid products.

A device for the manufacture, filling and sealing of packages of heat-sealing material, described in patent RU No. 2096279, publ. 11/20/1997, intended for the packaging of a viscous product. The device comprises a roll holder, tension rollers for tensioning the film, a sleeve former, a pipe with a nozzle at the end for feeding the product into the sleeve formed from the film, a device for forming a longitudinal seam on the sleeve, and also a mechanism for forming transverse seams, consisting of kinematically connected clamps . Clips are mounted on the carriage, which is pivotally connected to the wings. Clips with their rollers interact with sliders driven by kinematically connected cams. A carrier connected to the link and the drive is rigidly fixed on the axis of the cam. The device described in the patent has a complex kinematic scheme. In addition, drawing the film by swinging the wings does not provide the ability to change the length of the package. The patent RU No. 2096279 also describes a method of operation of the device, that is, a method for packaging a viscous product in sealed bags, adopted as a prototype of the first object of the invention, the method. The prototype method involves welding the tape in the longitudinal direction and forming a sleeve. When moving the clamps in the transverse direction, the end of the packet is sealed, its separation from the sleeve and the bottom of the next packet is formed. During the termination of the end of the package, the clamps move downward, while simultaneously pulling the tape from the roll holder and forming a longitudinal seam of the sleeve. Simultaneous welding and cutting immediately after the cessation of product supply leads to a decrease in the quality of the weld, because after the cessation of supply, the jumper of the residual product inevitably remains for a sufficiently long time, which, getting into the seam, impairs its sealing. The authors of the present invention also found that when a viscous product flows from the nozzle into the inner volume, air bubbles form in it, that is, the filling factor of the package decreases and the quality of the product deteriorates. The prototype method does not provide technological methods that prevent the spread of air bubbles in the volume of the package.

As a prototype of the second object of the invention, the Packaging machine described in patent RU No. 2165382, publ. 04/20/2001. The packaging machine includes a roll holder, tension rollers for tensioning the film, is also equipped with a pulling device, which is connected through a kinematic system with its drive. The machine includes a hose former, a material feed pipe, a pulling mechanism, a tool for forming a longitudinal seam, and a transverse cutting mechanism. The heads of the mechanism for the formation of transverse seams are connected to the lead screws through two pairs of threaded bushings with the corresponding thread. The first pair of threaded bushings on one of the lead screws is rigidly connected to the heads. The second pair is mounted on the lead screw with the possibility of linear movement. Welding elements are mounted on the heads movably and spring-loaded. The knife of the transverse cutting mechanism is rigidly fastened to the head and is located inside one of the welding elements, and the other welding element has a reciprocal groove for the knife. That is, the transverse seam forming unit and the transverse cut mechanism are combined in one assembly unit. The pulling mechanism is equipped with a separate drive. The description of the prototype does not indicate the presence of a common frame, a hopper for the product and the control system of the machine, but for the specialist it is obvious that these structural elements are present in the device. The packaging machine according to the patent RU No. 2165382 is intended for packaging a bulk product, and therefore it implements a device that combines the function of welding a transverse seam and transverse cutting, which, as noted above, is unacceptable for packaging fluid, viscous products, because leads to lack of penetration of the seam. The machine is not suitable for packing a viscous product due to the inability to prevent the formation of air bubbles in the product when filling the bag.

The basis of the invention is the task of expanding the arsenal of means and creating a method for packaging a viscous product in three-seam sealed bags of thermoplastic polymer film and a packaging machine that implements the method. Achieved comprehensive technical result - improving the quality of the package by ensuring its tightness by eliminating lack of penetration of the transverse seam while increasing the filling of the package with a viscous product (elimination of air bubbles in the product).

The problem is solved by the method and installation that implements it.

The claimed method of packaging a viscous product in three-sealed sealed bags of a thermoplastic polymer film is carried out in a vertical packaging machine. The method is characterized in that the film is drawn and a package open from above is formed by thermal welding of the film with the formation of a longitudinal seam forming a sleeve and the formation of a transverse seam; carry out dosed filling of the open bag with the product coming from the pipe with a nozzle at the end, also carry out the sealing of the bag and its separation from the sleeve. The method differs from the prototype in that in the process of filling the bag with the product, the nozzle exit is located at or below the product level in the bag by coordinating the drawing speed with the speed of filling the product with the bag, and after dosing of the product is stopped, additional drawing is carried out, after which a transverse seam is formed and subsequent separation of the package from the sleeve.

A vertical packaging machine that implements the method has a supporting frame on which a loading hopper, a roll holder for a thermoplastic polymer film, tension rollers, a sleeve former, a broaching and forming unit for a longitudinal seam of a film sleeve with crimps and a vertical iron are mounted. The machine also has a pipe for introducing the product into the sleeve, a unit for forming the transverse seam of the bag, a transverse cut mechanism and a control system. The machine differs from the prototype in that it is additionally equipped with a metering pump for supplying the product with a stepper motor, which ensures its operation. The pump through the distributor is connected to the pipe, at the output end of which there is a dosing head with a nozzle and a shut-off valve, which is controlled by a pneumatic cylinder. Moreover, the control system provides a process of filling the bag with a product, in which the nozzle cut is located at or below the product level in the bag, which is achieved by matching the speed of the sleeve with the speed of filling the bag with the product. The drive of the broaching unit and the formation of a longitudinal seam also has a stepper motor and a ball screw transmission, on which a crosshead is mounted with clamps fixed to it and a vertical iron.

In a preferred embodiment, in the packaging machine, the unit for forming the transverse seam of the bag and the transverse cut mechanism are made separately.

In order to better demonstrate the distinguishing features of the invention, as an example, not having any restrictive nature, the preferred embodiment is described below. An example implementation is illustrated by the drawings, in which: FIG. 1 is a general view of a packaging machine, FIG. 2 - product supply unit, FIG. 3 - node broaching and forming a longitudinal seam, FIG. 4 - heat sealing unit, FIG. 5 - cutting down mechanism.

The packaging and filling machine has a frame 1, on which its components and mechanisms are fixed, some of which are designed to form a bag, and the other part is for dosed feeding of the product into the bag.

In the unwinding unit 2, there is a roll holder for a bobbin of polymer heat sealable film intended for the manufacture of bags. A guide apparatus with rollers 3 for film tensioning, a sleeve former 4, a pipe 5 for introducing the product into the film sleeve, which at the same time is a guiding element for forming the bag sleeve itself, is also fixed on the frame 1. The machine also includes a broach and a longitudinal seam forming unit, including clamps 6 and a vertical iron 7, a transverse seam forming unit 8, a cutting mechanism 9. The machine also has a removable hopper 10 for the product with a booster air pump 11.

The product supply unit (see Fig. 2) contains a stepper motor 12, which ensures the operation of the metering pump 13, which is connected through the distributor 14 to the pipe 5. At the output end of the pipe 5, a metering head with a nozzle 15 and a shut-off valve (not shown) controlled pneumatic cylinder 16.

The drive of the broach and the formation of a longitudinal seam (see Fig. 3) is electromechanical using a stepper motor 17 and a ball screw 18, on which a beam 19 is mounted, on which clamps 6 and a vertical iron 7 with a pneumatic cylinder 20 are fixed.

The heat sealing unit is mounted on a vertical rack 21 of the common frame with vertical movement and fixing at a given height, taking into account the length of the formed package. The node (see Fig. 4) consists of two counter-oriented jaws, one of which - 22 is electrically heated, and the second - 23 - cold. Jaws 22 and 23 are provided with driven pneumatic cylinders 24.

The felling mechanism (Fig. 5) is also mounted on a vertical rack of the frame with vertical movement and fixation at a given height, taking into account the length of the formed package. The cutting down mechanism includes a punching stamp 25 with a figured knife 26, the shape of which is determined by the configuration of the loading and unloading end (for example, the outlet nozzle) of the formed package. The mate 27 can be formed in any suitable way, for example using a rolling roller 28, moved by a pneumatic cylinder 29.

The machine contains a control unit (not shown) that sets the duty cycle modes: it controls the feed rate of the product, the speed of broaching, namely, it controls the number of revolutions of the ball screw, matching the feed and broaching speeds (pneumatic cylinders). The machine is also equipped with monitoring devices connected to the control unit.

Depending on the dosed volume, and, accordingly, on the given length of the formed package, control parameters are entered from the control unit remote control (from the touch screen), a preliminary manual adjustment of the machine is carried out by setting the height of the heat sealing unit and the cutting mechanism.

The machine operates as follows.

The polymer film is fed from the unwinding unit 2 through the sleeve former 4 to the pipe 5 and passes through the broaching and forming unit of the longitudinal seam, in which the film is longitudinally moved along the pipe using clamps 6, and the longitudinal welding of the film edges with a vertical iron 7. After the formation of the seam of a given length transverse welding of the formed sleeve by jaws 22, 23. is carried out. Then, the product is supplied from the replaceable hopper 10. The product enters the bottom of the package open at the top. This ensures the condition under which the nozzle cut 15 during the filling of the bag is at the product level in the bag or below this level (1-3 mm), which is achieved by matching the pull speed with the speed of filling the product bag. At the end of the delivery of a predetermined dose from the nozzle, the product supply unit ceases to work, the shut-off valve is triggered, but at the same time, the sleeve continues to stretch until the specified packet length is reached (it can be tracked by a special mark), and longitudinal welding simultaneously occurs. In this case, the upper part of the package enters the zone of the heat sealing unit, where transverse heat sealing is carried out using jaws 22, 23. A seam is formed with a wide strip. After sealing the bag filled with the product, a transverse cutting is carried out in the cutting mechanism with a curly knife 26, which ensures the formation of the configuration of the outlet nozzle of the package and the bottom. The pulling mechanism returns to its original position, and the process is repeated to form and fill subsequent packets.

Thus, due to the fact that the program-controlled units incorporated in the design and, in particular, the applied stepper motors, and the pneumatic cylinders controlled from the general control system, the claimed product is matched with the speed of delivery of the product and the speed of broaching, depending on the properties of the product itself and preset packet length (product dose). At the same time, the nozzle cut is controlled and positioned relative to the level of the product in the bag, which leads to the fact that the viscous product to be filled in the bag is evenly distributed over the volume. It is established that otherwise, that is, when the nozzle cut is located above the product level in the bag and the product flows from a viscous jet from a height, the liquid flagellum bends above the surface of the liquid, forming folds and leaving air inside the volume. As a result, air bubbles form in the product at the peripheral zones of the package filling. In the claimed method and device, this does not occur. An additional broach after stopping the dosed filling of the product ensures separation of the viscous jumper formed from the product between the nozzle exit and the product itself in the bag, because stretching the jumper leads to its separation. If necessary (especially viscous product), additional swaying up and down is possible until the viscous jumper of the residual product is completely torn off. This allows, by reconfiguring the machine, to receive packets of almost arbitrary length with their uniform filling. Forced tearing of the viscous jumper ensures the tightness of the bag, because the product is not allowed to enter the transverse welding zone.

Claims (3)

1. The method of packaging a viscous product in three-sealed sealed bags of thermoplastic polymer film, carried out in a vertical packaging machine, which draws the film and forms an open top package by thermal welding of the film with the formation of a longitudinal seam forming a sleeve and a transverse seam, carry out dosed filling of the open bag with the product coming from the pipe with a nozzle at the end, sealing the bag and its separation from the sleeve, characterized in that in the process apolneniya product package provided by the location of the nozzle edge at the product level in the bag or below this level, by pulling rate matching with the speed of filling product package, and after termination of the metered filling product is carried out additional broach, then form a transverse seam and subsequently separating the package from the sleeve. 2. A vertical packaging and filling machine with a supporting frame on which a loading hopper, a roll holder for a thermoplastic polymer film, tension rollers, a sleeve former, a broaching and forming unit for a longitudinal seam of a film sleeve with crimps and a vertical iron, a pipe for introducing the product into the sleeve are installed , a unit for forming a transverse seam of the package, a transverse cut mechanism and a control system, characterized in that it is additionally equipped with a metering pump for feeding the product with a stepper motor, providing Through its operation, the pump is connected through the distributor to the pipe, at the output end of which there is a dosing head with a nozzle and a shut-off valve, which is controlled by a pneumatic cylinder, while the control system provides a process for filling the bag with a product in which the nozzle cut is located at the product level in the bag or below this level by coordinating the speed of the broach with the speed of filling the product package, the drive unit of the broach and the formation of a longitudinal seam has a stepper motor and ball screw a gear on which a crosshead is installed with clamps fixed to it and a vertical iron. 3. A packaging and filling machine according to claim 2, characterized in that the node for forming the transverse seam of the package and the transverse cut mechanism are made separately.

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