RU175395U1 - HEATING ELEMENT FOR WELDING SEAMS OF Billets of thermoplastic bags for vacuum cleaners - Google Patents

Abstract

The proposed utility model relates to the field of mechanical engineering, relates to a heating element that can be used in a semiautomatic machine for welding seams of thermoplastic bag blanks for vacuum cleaners. The heating element comprises a plate made of dielectric material, and a nichrome string fixed to the plate along the contour in the form of a rectangular frame with rounded corners. The technical result from the use of the proposed utility model is to improve the quality of welds of blanks of thermoplastic bags for vacuum cleaners, simplifying their manufacture. 2 s.p. f-ly., 2 Fig.

Description

The proposed utility model relates to the field of mechanical engineering, relates to a heating element that can be used in a semiautomatic machine for welding seams of thermoplastic bag blanks for vacuum cleaners.

A known electrode for welding thermoplastic materials, which is a nichrome wire in fluoroplastic insulation, mounted on a textolite base, which is used for the manufacture of plastic bags (ed. St. No. 1344619, class B29C 65/18, B29C 65/22, publ. 15.10. 1987).

A disadvantage of the known device is its limited functional use - welding and cutting film layers already connected to each other in a straight line. In addition, this device cannot be used to simultaneously complete all seams around the perimeter of the blanks of thermoplastic bags for vacuum cleaners.

The objective of the utility model is the creation of a heating element for welding seams of blanks of thermoplastic bags for vacuum cleaners.

The technical result from the use of the proposed utility model is to improve the quality of welds of blanks of thermoplastic bags for vacuum cleaners, simplifying their manufacture.

This is achieved by the fact that the heating element for welding seams of blanks of thermoplastic bags for vacuum cleaners contains a plate made of dielectric material, and a nichrome string fixed to the plate along the contour in the form of a rectangular frame with rounded corners; the plate is made of a sheet of PCB; the heating element is mounted on the suspension frame of the semiautomatic machine, made with the possibility of moving vertically, using bolts.

In FIG. 1 shows a general view of a heating element.

In FIG. 2 shows the frame of a semiautomatic machine with a heating element.

Structurally, the heating element in FIG. 1-2 contains:

1 - stove

2 - nichrome string.

Plate 1 is made of dielectric material.

A nichrome string 2 is fixed on the plate 1 along the contour in the form of a rectangular frame with rounded corners.

The assembly of the proposed utility model is as follows.

A plate 1 is made, for example, from a sheet of PCB.

On the surface of the plate 1, a nichrome string 2 is fixed along the contour in the form of a rectangular frame with rounded corners.

The plate 1 is fixed with a nichrome string 2 on the suspension frame of the semiautomatic machine, which can be moved vertically, for example, using bolts. For example, 1-4 heating elements can be fixed on the frame. In this case, nichrome strings 2 of the heating elements are placed axially mating part of the welding unit of the semiautomatic machine, made in the form of frames made of fluoroplastic-silicone rubber with round grooves mounted on a horizontal working surface. Nichrome strings of 2 heating elements are connected to a current source. Nichrome strings 2 are commutated with a current source by signals received via communication lines from the control unit. The control unit may include a timer that determines the time of switching nichrome strings 2 with a current source.

The proposed utility model works as follows.

Layers (2-6, depending on the type of workpieces being made) of a thermoplastic breathable material are fed to the mating part of the welding unit, mounted on the working surface of a semiautomatic machine. The frame with heating elements is lowered onto the mating part of the welding unit so that the nichrome strings 2 mounted on the plates 1 in the form of rectangular frames with rounded corners are lowered into the grooves of the frames made of fluoroplastic silicone rubber. At the same time, nichrome strings 2 tightly press the layers of the thermoplastic material being welded to the counterpart of the welding unit on which they lie. On the control unit, a timer starts, delaying the switching of the heating element with the current source for 0.5-1.5 seconds. Next, the current source is connected to nichrome strings 2 for a time determined by the timer, and for this it supplies an active signal via an electric communication line between the control unit and heating elements. The timer for 0.2 ÷ 3 seconds commutes the power source with nichrome strings 2. At the same time, a direct electric current of 9-12 volts is supplied to nichrome strings 2. Due to this, nichrome strings 2 weld seams along the contour of the workpiece in the form of a rectangle with rounded corners. After the welding operation, the frame with heating elements is returned to its original upper position.

Get the blanks of thermoplastic bags for vacuum cleaners with smooth (no nicks) welds and rounded edges of the holes, 0.6-0.7 mm thick, 2-5 kg / cm strength.

The proposed utility model simplifies the manufacture of blanks of thermoplastic bags for vacuum cleaners due to the simultaneous execution of all welds along the contour of the blank. In addition, the fastening of a nichrome string in the form of a rectangular frame with rounded corners helps to increase the strength of welds due to the implementation of radius welds in the corners of the workpieces, which distribute the load of the air flow around the perimeter of the bag when they are used.

Example.

Using the proposed heating element, it is possible to produce blanks of thermoplastic bags for vacuum cleaners of the following options:

- two-layer dust-proof bags for household and industrial vacuum cleaners with a size of 600 × 300 mm, 600 × 450 mm;

- three-layer dust-proof bags for household and industrial vacuum cleaners with a size of 600 × 300 mm, 600 × 450 mm.

For the manufacture of a two-layer bag, 4 layers of material are used: spunlite meltblown spanbond (CMC) - spunlite spunbond (SS) - spunlate spanbond (SS) - spunlite meltblown spanbond (CMC). Spunlite Meltblown Spunbond (CMC) is used as a reinforcing-filtering layer that holds particles up to 20 microns. Spanlite spanbond (SS) is used as a coarse filter and as a protective layer to reduce the kinetic energy of incoming heavy particles to 100 microns, to prevent damage to the bag. The thickness of the seam and the thickness of the two-layer bag are 0.6 mm, the tensile strength is 29.41 N - 68.64 N per 1 cm of the seam.

For the manufacture of a three-layer bag, 6 layers of material are used: spunlite meltblown spanbond (CMC) - meltblown (M) - spunlite spunbond (SS) - spunlite spunbond (SS) - meltblown (M) - spunlite meltblown spanbond (CMC). Spunlite Meltblown Spunbond (CMC) is used as a reinforcing-filtering layer that holds particles up to 20 microns. Meltblown (M) is used as a fine filter holding particles up to 1 micron. Spanlite spanbond (SS) is used as a coarse filter and as a protective layer to reduce the kinetic energy of incoming heavy particles to 100 microns, to prevent damage to the bag. The thickness of the seam and the thickness of the three-layer bag are 0.7 mm, the tensile strength is 29.41 N - 68.64 N per 1 cm of the seam. The thickness of the seam and the thickness of the three-layer bag are 0.7 mm, the tensile strength is 29.41 N - 68.64 N per 1 cm of the seam.

Claims (3)

1. The heating element for welding seams of blanks of thermoplastic bags for vacuum cleaners contains a plate made of dielectric material, and a nichrome string fixed to the plate along the contour in the form of a rectangular frame with rounded corners. 2. The heating element according to claim 1, characterized in that the plate is made of a sheet of PCB. 3. The heating element according to claim 1, characterized in that it is mounted on the suspension frame of the semiautomatic machine, made with the possibility of moving vertically, using bolts.

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