CZ2002853A3 - Static mixing device - Google Patents

Abstract

The static mixer (10) contains screw-like mixing sections (16, 18) of differing pitch. Preferred Features: The mixing sections form a sequence alternating between greater and lesser pitch. Their pitches differ. The mixing sections differ in their sense of rotation. The initial edge of one section, is offset at an angle with respect to the terminal edge of the preceding section. Mixing sections with smaller pitch, are shorter than those with greater pitch, measured along the length of the channel (14). The sections of smaller pitch, have a length about 0.5 times the channel diameter. Those with greater pitch have a length of 0.9-1 times the channel diameter. A mixing section has an angle of rotation of about 180 degrees .

Description

Technical field

The invention relates to a static mixer for mixing a plurality of mainly pasty material components, with the features of the preamble of claim 1. The static mixer is adapted in particular to mix the hardener and the binder with the addition of a synthetic resin. In principle, more than two material components may also be mixed. For example, the material components are extruded from the cartridge and forced through a static mixing device.

BACKGROUND OF THE INVENTION

Such static mixing devices are known per se. They have a tube as a housing that forms a through channel. In the pipe, respectively. through the passage channel, worm-like mixing elements are provided one behind the other. The mixing elements can also be understood as axial sections of a single continuous mixing element. Inside and / or between the mixing elements passageways are formed to join the strips of material which have been divided into the strips of material first by the mixing element. The passages may be recesses or breaks out of the mixing elements. Advantageously, the passages are achieved by angularly offset end and start edges of successive mixing elements and / or axial spacing of successive mixing elements.

83535a (83535a)

PV 2002 - 853 • 4 4 · 4 * 4

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4,444,444 ··· 4444,444 44,444 «elements. Through the mixing elements, the extruded material components are repeatedly divided into strips of material by means of a static mixing device and re-joined and thus mixed.

SUMMARY OF THE INVENTION

It is the object of the present invention to further develop a static mixing device of the kind mentioned in the introduction, so as to reduce the punching force and improve the mixing.

This object is solved according to the invention by the features of claim 1. The static mixing device according to the invention with the features of claim 1 has mixing elements with different pitches. Different pitches cause different flow rates of the material components by the static mixer, thereby improving mixing. In particular, homogeneous mixing of the material components with different viscosities can be achieved.

Preferably, the mixing elements alternate with greater and lesser pitch. A further improvement of the mixing of the material components is achieved by providing mixing elements with different pitch directions (clockwise or anti-clockwise), which impart to the material components, pushed through the static mixing device, a right or a left hand rotation. left turn. Advantageously, the mixing elements provided in turn have different pitch directions. As a result, the previously distributed strips of material are forced into each other by the mixing element and good mixing is achieved.

An embodiment of the invention proposes that the facing and end edges of the mixing elements arranged one behind the other are mutually offset at an angle. Reduction of the punching force of the material components by a static mixing device a

83535a (83535a)

PV 2002 - 853 4 4 4

Good mixing is achieved by optimizing the geometric proportions of the mixing elements. An embodiment of the invention is that the low pitch mixers in the longitudinal direction of the static mixer are shorter than the high pitch mixers. The low pitch mixing elements give the extruded material components a greater twist than the high pitch mixing elements. As a result, the punching force can be reduced. Advantageously, due to the low punching force with good mixing of the material components, an embodiment in which the mixing elements with a low pitch have a length corresponding to approximately 0.5 times the cross-section or the cross-section has proved to be advantageous. the diameter of the passage channel of the static mixing device. It has also proven advantageous if the mixing elements with a large pitch have a length corresponding to approximately 0.9 to 1.0 times the cross-section, respectively. the diameter of the passage channel of the static mixing device.

In an embodiment of the invention, the mixing element has an angle of rotation of approximately 180 °. By the rotation angle is meant the angle by which the mixing element is rotated about itself in its longitudinal direction. At a rotation angle of 180 °, the start and end edges of the mixing element are parallel to each other. Mixing elements with small and large pitches can have the same angle of rotation.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be a specific example in which it represents the invention.

an embodiment of the static is explained by means of the drawing in FIG

83535a (83535a)

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DETAILED DESCRIPTION OF THE INVENTION

The static mixing device 10 of the present invention has an injection cannula 12 that forms a tubular housing of the static mixing device 10. The interior of the injection cannula 12 forms a through channel 14 for extruding the mixed material components. At the rear end, the injection cannula 12 has an internal thread 15 to be screwed onto a cartridge (not shown) or below. a container from which the mixed material components are extrudable and extrudable through an injection cannula 12. For removal from the injection tool or the like. and / or to insert the mixing elements, the injection cannula 12 may be conical.

In the through channel 14 of the injection cannula 12 there are a plurality of screw-like mixing elements 16, 18 which are arranged axially one after the other. The mixing elements 16 with a small pitch alternate with the mixing elements 18 with a large pitch. The pitch direction of the low pitch mixers 16 is directed against the pitch direction of the high pitch mixers 18, the low pitch mixers 16 are clockwise and the high pitch mixers 18 are left-handed or vice versa. The axial length of the low pitch mixing elements 16 is shorter than the axial length of the high pitch mixing elements 18. In the illustrated and described embodiment, the axial length of the low pitch mixers 16 is about 0.5 times the diameter of the passageway 14, the axial length of the high pitch mixers 18 is about 0.9 to 1.0 times the diameter of the passageway 14. As shown in FIG. the low-pitch mixing elements 16 and the high-pitch mixing elements 18 have an angle of rotation over their axial length of approximately 180 °, the rear end of the injection cannula 12, respectively. Thus, the leading edge 20 facing the female thread 15 is approximately

83535a (83535a)

PV 2002- 853

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44 4 parallel to the end edge 22 of each mixing element 16, 18 facing the front end of the injection cannula 12. of the following mixing elements 16, 18 are aligned approximately rectangular, thus having an angular offset of about 90 °. The intersections of the mixing and mixing elements 16, 18 arranged in succession with the mutually facing start and end edges 20, 22 create passages 24 between the mixing elements 16, 18. The mixing elements 16, 18 are produced together in one piece, for example by injection molding of plastic.

The cartridge contains two components, for example, a binder and a hardener of two-component mortar with the addition of a synthetic resin. Both components are pasty and may have different viscosities. Both components are extruded from the cartridge together in a predetermined volume ratio. More than two material components can be extruded while mixing with the static mixing device 10 according to the invention.

When pushed through the static mixer 10, the material components at the initial edges 20 of the mixing elements 16, 18 are divided into two strips of material and at the passages 24 between the end and starting edges 22 of the successive mixing elements 16, 18 reunited. Since the mixing elements 16, 18 are alternately clockwise and anti-clockwise, the turkey, forced by the extruded strips of material, turns the mixing elements 16, 18 at the transition from the mixing element 16, 18 to the next mixing element 18, 16, i.e. mixing elements 16, 18. The previously divided strips of material are brought into each other during the joining and thus mixed with each other. By varying the pitch of the mixing elements 16, 18, the creep rate of the strips of material and the material components at

83535a (83535a)

PV 2002 -853 Extrusion through the static mixing device 10 according to the invention. The device reduces e components.

The creep rate increases repeatedly over the length of the static mixer 10, and this causes good mixing of the

Claims (9)

PATENT CLAIMS Static mixing device for mixing a plurality of mainly paste-like material components, with screw-like mixing elements which are arranged in series in a passageway, and passageways for connecting strips of material which have previously been divided into strips of material by the mixing element, the static mixing device (10) has mixing elements (16, 18) with different pitches. Static mixing device according to claim 1, characterized in that the successive mixing elements (16, 18) have alternately larger and smaller pitches. Static mixing device according to claim 1, characterized in that the static mixing device (10) has mixing elements (16, 18) with different pitch directions. Static mixing device according to claim 3, characterized in that the successive mixing elements (16, 18) have alternately different pitch directions. Static mixing device according to claim 1, characterized in that the initial edge (20) of the subsequent mixing element (16, 18) is angularly offset to the end edge (22) of the previous mixing element (18, 20). Static mixing device according to claim 1, characterized in that the mixing elements (16) with a smaller pitch in the longitudinal direction of the through channel (14) are shorter than the mixing elements (18) with a larger pitch. 16 83535a (83535a) PV 2002-853 • · · · Static mixing device according to claim 6, characterized in that the mixing elements (16) with a smaller pitch have a length of approximately 0.5 times the diameter of the passage channel (14). Static mixing device according to claim 6, characterized in that the mixing elements (18) with a larger pitch have a length of approximately 0.9 to 1.0 times the cross-section of the through duct (14). Static mixing device according to claim 1, characterized in that the mixing element (16, 18) has an angle of rotation of approximately 180 °.