RU174079U1 - DEVICE FOR THERMAL WELDING OF POLYMER FILM LAYERS - Google Patents

Abstract

The utility model relates to devices for the production of blanks or products from welded multilayer - two or more layers, - polymer film material. A device for thermal welding of polymer film layers contains a three-dimensional frame, elements for installing film rolls, smooth and corrugated pulling shafts, and electric heaters are placed in the corrugated shafts, and a shaft for winding the finished welded web. The device is characterized in that it is equipped with additional smooth pulling shafts with the formation of independent groups of one corrugated and two smooth shafts, and a fan is installed inside the volumetric frame on the side of the shaft for winding the finished welded fabric before blowing it. EFFECT: increased productivity of thermal welding of a multilayer film while improving welding quality and reducing the amount of waste. 3 s.p. f-ly, 1 ill.

Description

The utility model relates to devices for the production of blanks or products from welded multilayer - two or more layers - of polymeric film material (polymeric film materials), in particular, carrying elements or loop handles of polyethylene shopping bags or bags, etc.

A device for transverse welding is known that is used in a packaging machine for the manufacture, filling and sealing of a plastic film package, containing two cheeks that are moved along the guides in the opposite direction from the initial position to the welding position and pressed against each other through clamping blocks made along the entire length flat, heaters for heating pads, which are equipped with thermocouples, a cutting knife, moved from its original position to the place of cutting of the finished package [Description of the useful fashion whether the patent of the Russian Federation No. 110720 dated 01.07.2011, IPC B65B 51/00, publ. 11/27/2011, bull. No. 33]. The device could potentially be used for welding multilayer films.

The disadvantage of this device is its specialization in welding exclusively transverse seams of individual products. Using a device for welding longitudinal seams of workpieces of conditionally infinite length will not allow to ensure high productivity and stability of the quality of welded joints.

A device is known for welding polymer films, comprising a welding roller mounted on a guide by means of a slider with a cylinder fixed in it, in which a welding roller holder is mounted using a rod, spring-loaded relative to the slide, the guide being made with a gear surface connected to the electric motor through a shaft with gear, and is mounted on the table by means of vertical racks, the holder in which the welding roller is mounted is installed in the heater, and the cylinder is fixed in the slide COROLLARY adjusting screw. In addition, the welding roller is made with a release coating on the work surface, the welding roller is made of release material, and the table is equipped with a release coating [Description of the invention to RF patent No. 2081750 of 05.11.1992, IPC ВСС 65/18].

The disadvantage of this device is that its design allows you to consistently form only one long weld, which is irrational and unproductive in continuous multilayer welding over the entire area of the polymer product.

The claimed technical solution, which is closest in the totality of essential features, is a device for welding polyethylene films, erroneously called their thermal corrugation, containing an unwinding stand with the possibility of installing at least one roll of film, means for stretching the film, a knife for trimming the film, bends for removal scraps, lingering shafts, including two heated, having mutually engaging grooves, while the rollers with film rolls and the winding shaft are equipped with cones that regulate the position of the roll, the surface of the heated shafts has uniformly alternating longitudinal or transverse grooves with a width and depth of 1-15 mm and protrusions 1-15 mm wide, and longitudinal openings for installing thermoelectric heaters are made in the shafts, and bronze rings insulated from each other are fixedly mounted on the shafts other fluoropolymer bushings and in contact with electrographic brushes placed in the brush holders [Description of the utility model to the patent of the Russian Federation No. 168283 of 03.24.2016, IPC V29C 59/04, V29C 69/00, publ. 01/26/2017, bull. Number 3].

The disadvantage of this device is that the welding of the layers of the films is carried out on a conditionally linear contact, which requires complex settings of the equipment with limited performance. The film broaching when setting up the device requires additional labor costs, and the presence of knives for trimming the edges of the welded films provides for the presence of additional waste requiring further disposal.

The problem solved by this utility model and the technical result achieved are to increase the productivity of the device while improving the quality of welding of polymer film layers and reducing the amount of waste.

To solve the problem and achieve the claimed technical result, the device for thermal welding of polymer film layers contains a three-dimensional frame, elements for installing film rolls, smooth and corrugated broaching shafts, and electric heaters are placed in the corrugated shafts, and a shaft for winding the finished welded web, equipped with additional smooth pulling shafts with the formation of independent groups of one grooved and two smooth shafts, and inside the surround frame from the shaft side for skeins ready welded fabric has a fan for blowing it before winding.

Besides

each group of corrugated and smooth shafts is made with the possibility of their simultaneous dilution for manual drawing of the film;

the device is equipped with a device for folding the film from one roll into several layers;

smooth and corrugated pulling shafts are made of release material or with release coating.

The utility model is illustrated by the drawing, which shows a General view of the device for thermal welding of layers of a polymer film in a perspective view.

A device for the thermal welding of polymer film layers contains a three-dimensional frame (frame, bed) 1, elements (specially equipped brackets) 2 for setting the required number of film rolls, smooth 3 and 4 and grooved 5 and 6 broaching shafts, and in grooved 5 and 6 shafts electric heaters are placed (not shown conditionally) and a shaft 7 for winding the finished welded web, while the device is equipped with additional smooth broaching shafts 3 'and 4' with the formation of independent (independent) groups of one corrugated 5 or 6 and two smooth shaft o 3, 3 'or 4, 4', while inside the volumetric frame 1 from the shaft 7 for winding the finished welded fabric, a fan 8 is installed for blowing it (the fabric) before winding.

Each group of grooved 5 and smooth 3 and 3 'shafts and grooved 6 and smooth 4 and 4' shafts is made with the possibility of them - grooved 5 and 6 from smooth 3, 3 'and 4, 4', - simultaneous dilution for manual broaching of the welded film, for which a rotary frame 9 is used, on which a part of the shafts from the divorced groups is placed - the corrugated shaft 5 from the smooth shafts 3 and 3 'and, accordingly, the smooth shafts 4 and 4' from the corrugated shaft 6.

The device can be equipped with a device (not shown conditionally) for folding a film from one roll, usually in two layers, although a wide film can be folded into three or more layers. To do this, use a number of support rollers arranged sequentially at an angle to each other, and, if necessary, balancing rollers. As a rule, the device is initially set up to work with a certain size of the film being welded, for example, as shown in the drawing — three independent rolls — and continue to use debugged settings whenever possible throughout the device’s life cycle.

Smooth 3, 3 'and 4, 4' and grooved 5 and 6 broaching shafts are made of release material, such as fluoroplastic or other similar materials, or these shafts can be made of metal, such as aluminum alloy, but have a release coating, such as Teflon. It may be preferable when the corrugated shafts 5 and 6 with electric heaters are made of metal with high thermal conductivity with the coating of their surfaces teflon in contact with the film being welded.

Let us analyze the essential features of a utility model.

Improving the performance of the device is ensured by the fact that not one smooth shaft 3 and 4, but two, 3, 3 'and 4, 4', are in contact with each of the heated corrugated shafts 5 and 6. Due to this, the contact zone of the film layers with the heated surface of each of the corrugated shafts 5 and 6 is increased. In this case, their heating temperature can be increased. As a result, due to the additional linear contact of the additional smooth shafts 3 'and 4' with the heated shafts 5 and 6, in addition to an increase in productivity, a “side” effect appeared - the quality of welding of the film layers improved.

Increasing the productivity of the device required forced cooling of the welded film, for which, inside the volumetric frame 1 from the side of the shaft 7, a fan 8 was installed for winding the finished welded web to blow it before winding on the shaft 7.

An increase in the productivity of the device is affected by a decrease in the time for filling the film at the beginning of its operation and, if necessary, on the build-up of a new film from a new roll to replace it, which can be successfully leveled using rolls of film of the same length. For this, each group of corrugated 5 and 6 and smooth 3, 3 'and 4, 4' shafts is made with the possibility of their simultaneous dilution for individual manual drawing of film layers and, accordingly, combining the edges of these layers. The “side” effect of this solution is manifested in the fact that the amount of film waste is significantly reduced due to the exclusion of the trimming operation.

Working with one wide film, which is folded into several layers, also reduces the time for refueling the device and reduces the amount of waste due to the simultaneous pulling of the folded web for each layer during refueling and the simultaneous end of the web for each layer in a roll.

The use of ordinary metals and alloys, as well as a variety of polymers, in the manufacture of smooth and corrugated laminating shafts is permissible, however, for their impeccable work - without sticking the film, it is necessary to make very fine adjustments to the welding temperature, pressure and speed of drawing. In addition, a sufficiently large amount of film will go to waste. The implementation of smooth and corrugated pulling shafts from a release material such as fluoroplastic or with a release coating such as Teflon film allows you to use higher temperatures for welding and higher drawing speeds of the welded strip. All this also increases the performance of the device.

We will consider the implementation of the utility model by the example of continuous welding of three independent layers of a polymer film, as the most popular and widespread.

Example.

In the initial state, the device is complete and electrically connected to the network.

Using an electric motor 10, a pivoting frame 9 is lifted, fixed to the frame 1 by means of the axis 11. A first film roll is mounted on the lower bracket 2 and fixed in the axial direction. The free end of the film is stretched between the first shafts in the course of the process stream — grooved 5 and smooth 3; 3 'and second shafts - grooved 6 and smooth 4; four'. Passing over the nozzle 12 of the fan 8 through the support shaft 13, the end of the film is fed to the shaft 7 for winding the finished welded fabric and temporarily fixed on it.

Similarly, the second - middle and third - upper film rolls are sequentially installed. The ends of the three rolls are superimposed on each other with alignment of the side edges and secured for winding on the shaft 7. The shafts 7 and 13 and, for example, the shafts 6 and 3 are driven. Using the electric motor 14 and the corresponding pulleys, couplings and gears, part of the shafts (3, 3 ', 4, 4', 5 and 6) can rotate at a technologically set speed, and the other part of the shafts rotates either freely (shafts 15 of three brackets 2) , or with slipping (shafts 13 and 7), while the shaft 7 provides a guaranteed tightness of the welded films coming from the shafts 3, 3 ', 4, 4', 5 and 6.

Before starting the device, the electric heaters of the corrugated shafts 5 and 6 are turned on. The corrugations of the shafts differ in the direction of the corrugations — longitudinal corrugations on one shaft and transverse corrugations (ring) on the other. When corrugated shafts 5 and 6 reach a predetermined temperature, as a rule, 210-230 ° C, which depends on the selected drawing speed of the combined film layers and their thickness, turn on the electric motor 14 and simultaneously lower the rotary frame 9. Welding, forced cooling and winding starts welded film on the shaft 7.

In the welding process, one set of shafts 3, 3 'and 5 provides welding, for example, longitudinal seams, and another set of shafts 4, 4' and 6, for example, transverse seams. Due to the fact that the films being welded contact with the heated shafts 5 and 6 not in a line or in single spots, but in the area, guaranteed heating of the films takes place, and the double contact of each of the heated shafts with their smooth shafts duplicates the compression of the layers of films necessary for welding.

As a result, a thermally welded three-layer film with matching longitudinal edges without clearly visible corrugations is wound on the shaft 7, pleasant to the touch, durable and without delamination. The resulting product can be used including for further thermal welding in other products.

The waste of a thermally welded three-layer film is the initial sections of three single films formed during their filling, and the end sections formed as a result of a mismatch in the length of the film in each roll.

The finished roll of a three-layer film is delivered to a warehouse or shipped to consumers, for example, manufacturers of single-layer or multi-layer polymer bags as loop handles or package walls.

Two-layer welding of two independent films, four-layer welding of four independent films, two-three-layer welding, etc., are carried out in a similar manner. rolled up wide web, etc., etc. or a combination of these options. The material equipment of the device and the set of technological modes of operation of the equipment will depend on this.

As a result of solving the problem, the productivity of thermal welding of a multilayer film increased while improving the quality of welding and reducing the amount of waste.

Claims (4)

1. A device for the thermal welding of layers of a polymer film containing a three-dimensional frame, elements for installing film rolls, smooth and grooved broaching shafts, wherein electric heaters are placed in the grooved shafts, and a shaft for winding the finished welded web, characterized in that it is equipped with additional smooth broaching shafts with the formation of independent groups of one corrugated and two smooth shafts, while inside the volumetric frame on the side of the shaft for winding the finished welded fabric installed fan for duva before winding. 2. The device according to claim 1, characterized in that each group of corrugated and smooth shafts is made with the possibility of their simultaneous dilution for manual drawing of the film. 3. The device according to claim 1, characterized in that it is equipped with a device for folding the film from the roll in two layers. 4. The device according to p. 1, characterized in that the smooth and grooved pulling shafts are made of a release material or with a release coating.

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