DE1213217B - Method of manufacturing honeycomb material - Google Patents

Description

The invention relates to a method of manufacturing of honeycomb material make honeycomb material by applying mutually parallel Adhesive strips transverse to the direction of a material web and stack on top of each other Adhesive strips finitely offset from one another from layer to layer.

Known processes of this type allow continuous production of sections provided with staggered adhesive strips however, turning over these sections by means of additional devices, e.g. B. Turning devices or floating plates to the desired graduation to reach the glue strips. The known method is thereby cumbersome and can not always avoid a final waste, since it z. B. is necessary, the strip material to fold back and forth in a lap process and the folded over ends as Cut off waste.

The invention is based on the object of specifying a method after which a stacking of honeycomb material with offset from layer to layer Glue strips simplified, d. H. without turning or moving the material back and forth, is feasible. This object is achieved according to the invention in that the continuous Web material by means of a cross cutter in such a way determining the length of the layers equal sections are split up, alternating sections with and sections without adhesive strips on the two cut edges. Be that way continuous sections with staggered adhesive strips can be produced, without the need for the above-mentioned additional facilities to achieve the desired To achieve staggering of the sections provided with the adhesive strips.

In many cases it is advantageous if, in addition, bare, i.e. H. Adhesive-free tapes are used in such a way that between each two sections a portion of the adhesive-free sheet from the adhesive-coated sheet is placed. In this way, it becomes possible to reduce the order work and to save on glue if necessary.

Further details and advantages of the invention emerge from the following description. The drawings in which the same reference symbols in the individual figures apply to the same parts.

In these drawings, which show embodiments of the invention by way of example and schematically, FIG. 1 is an essentially schematic perspective view from which the principles of carrying out the method according to the invention can be seen; F i g. 2 and 2a show a plan view of a part of an unexpanded stack of honeycomb materials produced according to the invention, one part being shown in the fully expanded state and the other in the expanded state; F i g. 3 is a substantially schematic view of an alternate embodiment of the method; F i g. 3 a shows a plan view of a section of one according to the one shown in FIG. 4 produced honeycomb material stacks, wherein one part of the stack is shown fully expanded and the other part is shown expanded; F i g. FIG. 3b is a plan view of the model shown in FIG. 3 illustrated method of the honeycomb material stack produced, wherein one part is also shown expanded and the other part is shown fully expanded; F i g. 4 is a fragmentary, generally schematic view of another modified embodiment of the invention; F i g. Figure 5 is a generally schematic view in perspective showing how the material can be provided with weaker perforated scissor or saw guide lines; F i g. Fig. 6 is a perspective view of a honeycomb part made according to Fig. 5; F i g. 7 is an enlarged partial plan view of the FIG. 5 path shown. In Fig. 1, 10 denotes a continuous web of the material from which the honeycomb material is to be made, e.g. B. paper, resin-impregnated glass or textile fabric or metal foil. Said material is fed from a roll 11 through an arrangement 12 with a rotogravure push button and continuously fed. The assembly 12 can be of essentially conventional type and construction and comprise a pressure cylinder or drum 113 on which lines 14 are engraved, which consist of recessed or raised cells, which are rotated and immersed in the tank 16 filled with liquid adhesive pick up and hold the adhesive. The conventional doctor blade 17 is mounted on the cylinder 13 and strips excess glue from the unengraved parts of the cylinder. When the web 10 passes between the cylinder 13 and the rubber pressure roller 18, a surface 19 of the web 10 is printed with spaced apart, parallel adhesive strips 21 which extend transversely to the longitudinal axis of the web 10.

When the honeycomb material (eg. As polyvinyl butyral) using a three-stage thermosetting resinous adhesive is prepared, it can be which brought dried and later by application of additional heat into a thermoplastic, flowing state in the furnace in a relatively dry, non-tacky state, in which it flows and adheres to a surface, the adhesive strips 21 can be dried by passing the web under a suitable infrared lamp or other heat source 22. The drying of the adhesive facilitates the subsequent handling, cutting and stacking of the material without the risk of smearing the adhesive strips.

The reference numeral 23 generally designates a cutting point, which can comprise a conventional web cutting device with a rotating knife 24 which cooperates with a stationary knife 26 and cuts the web material 10 into sections 10 a of the same and desired length. Then the cut pieces 10a are placed on top of each other and. glued together to form a stack or block 30 of honeycomb material. If a wet adhesive is used to print the strips 21, each sheet or sheet will adhere to the next sheet along the lines 21 on the sheets arranged in the stack. If an oven-dried thermoplastic or thermosetting resin adhesive is used, the entire stack should first be placed on a vibrating table to ensure uniform stacking of the sheets, after which the stack is placed in a hot press, in which the lines 21 after the application of suitable pressure and Heat can be caused to soften and flow into adhesive contact with the abutting surface of an adjacent sheet in the stack. Pressure and temperature depend on the nature of the adhesive used and are well known factors or can easily be determined.

When cutting and stacking the sections-10a it is essential proceed in such a way that the sections in the stack 130 are correctly oriented and arranged are, so that the adhesive strips 21, which each have two adjacent sections stick together, stacked against each other - offset so that the latter becomes cellular Honeycomb material. can be expanded.

F i g. Figure 2 of the drawings shows schematically the arrangement and pattern of the stacked portions 10a as well as the relative arrangement of the adhesive strips 21 in a stack 30.

F i g. 2a illustrates how a piece of such a material can be made the honeycomb pattern shown can be expanded, which by a variety curved or corrugated bands 10 b is determined, which are in a common Direction, with their abutting backs 21a attached to each other are. Each cell of the honeycomb mat according to FIG. 2 a is essentially hexagonal and has six edges of. same length, with two adjacent edges to each other form an angle of about 120 °. To this essentially perfect To achieve the hexagonal shape of the cells, the adhesive strips 21 are applied to the web 10 printed in the specified pattern, in which the distance between the neighboring Lines 21 is three times as wide as each individual strip 21 itself. This relationship is identified by the letter T, which is the width of each strip of glue 21 indicates, and by the symbol 3 T, which indicates the distance between the adjacent Adhesive strip 21 indicates.

The cutting of the running web 10 in sections 10a of the same dimensions and along cutting lines, which - as previously described, orient the adhesive strips in the stack correctly offset, is carried out, for example, in such a way that the first section or the first piece that is cut off from the web is by means of the rotating cutting device or other auxiliary means is cut according to the following formula: X = T (4N -f- 2) where X is the length of the section in centimeters, T is the width of each adhesive line in centimeters and N is the number of cell nodes 21a desired over the sheet metal length . Cell nodes or backs are to be understood as meaning the sections of the individual cells lying against one another that are glued to one another. .

When the first or starting piece is cut according to this formula and then the web is divided into sections of the same length, are the adhesive strips side by side or cut off sections one after the other arranged after stacking in the stack so that their glue strips are precisely aligned and are offset from one another. The drawing shows that the edges of the sections are alternately free of adhesive and covered with it. The above formula is intended to only show one way to satisfactorily cut the web under correct alignment of the cutting lines in the stack, but you can too otherwise mathematically or empirically determine the appropriate cutting cycle for the Determine the path.

For the expansion of the glued-together stack 30 of glued sheets 10 a, it is advantageous to cut the stack - if desired - first into smaller sections of the desired thickness and only then to expand it. In this sense, the stack 30, as shown in FIG. 1; be cut or sawed along lines 27 which run transversely to the adhesive strips 21 in the stack.

F i g. 3, 3 a and 3 b denote a modified embodiment of the invention. In Fig. 3, the continuous web 50 is fed from a roll 51 through a first rotogravure printing device 52 which applies the adhesive and in detail comprises an engraved cylinder 53 which cooperates with an adhesive tank 54 and a doctor blade 56. When the web passes between the engraved cylinder 53 and the pressure roller 57, spaced parallel, transverse adhesive strips 58 are applied to the front side 50 a of the web.

The web is continuously fed through a second gravure printing device 59 which applies adhesive and which also includes an engraved cylinder 61, an adhesive tank 62, a doctor blade 63 and a pressure roller 64. In order to avoid smearing of the glue strips 58 on the upper side 50a of the web during the passage between cylinder 61 and pressure roller 64, the latter can be provided with circumferential, spaced notches or notches 66, the spacing and circulation of which is selected according to the spacing and the speed of rotation of the adhesive strips 58 which continuously engage in the cutouts 66 in the roller 64 and so do not smear. The cylinder 61 can be rotated in directly synchronous direction and speed with the speed and rotation of the cylinder 53, the engraved part 61 a of the cylinder 61 on the underside 50 b of the web 50 applying spaced apart parallel adhesive strips 68 in such a way that the lines 68 offset and run parallel to the lines 58.

Another resinous adhesive with thermoplasti-If a multi-stage delusional hardening resin or other resinous adhesive with thermoplastic Properties is used, the web 50 through a designated 71 drying device are fed to cause the adhesive strips to become substantially dry, non-tacky State to be dried, the subsequent cutting and stacking of the material relieved.

The web, on both sides of which the preferably heat-dried strips 58 and 68 have been applied, can then be cut by a cutting device similar to that described with reference to FIG. 1, which also has a rotating knife 72 and a fixed knife 73 which cooperate to cut the web 50 into sections of equal length and dimension. The sequentially cut strips are stacked as shown, and overlapping strips in stack 75 (Fig. 36) are glued together along mating strips of adhesive. In this context it should be noted that both the top and bottom adhesive strips 58 and 68 of each section are alternately offset within the stack, depending on the corresponding adhesive strips on the top and bottom of each section. section below, where. the upper .Streifen 58 of each section coincide exactly with the lower strip of a sheet metal lying on it and are in contact with it. In order to achieve accurate alignment of the cut parts, it is necessary that the web 50 be divided into sections of equal length and into multiples of adhesive strips of an odd number, which is the total number of adhesive strips applied to the top and bottom sides per length of section . In Fig. 3 is a cutting line 76 on five glue lines in front of them.

F i g. 3 a and 3 b in turn shows that a stack 75 of the stacked Sections of a material web are expanded to form a hexagonal honeycomb material can. Details will be given later.

F i g. FIG. 4 shows a further embodiment of the invention and can in particular be used as a further expansion or modification of the in FIG. 3 illustrated apparatus can be viewed. Assume that the path 150 in FIG. 4 was produced exactly according to the method shown in FIG. 3, in which adhesive strips 158 are applied to the upper side 150 a of the web and adhesive strips 168 are applied to its lower side 150 b . The left side of FIG. 4 shows the web emerging from drying station 171. Some elements of FIG. 4 are corresponding to the similar elements of FIG. 3 numbered, but in the hundreds.

F i g. 4 also shows a roll 180 of bare web material1181, which is fed via feed rollers 182 to a rotating cutting device 183 will. The sections 181 a cut from this bare web, on which none Adhesive strips are applied between the cutting device 160 Sections or sheets 159 cut from the web 150 are placed.

Once again it should be noted that the proper alignment of the adhesive strips 158, 168, which hold all sections 181a and 159 together in the stack as a fully expanded honeycomb material, is achieved by the particular manner in which the sections are cut from the continuous length of web. In the method according to FIG. 4 it can be seen that each of the glued web sections is cut with an even plurality of applied adhesive strips per cut section, whereby the total number of strips 158 and 168 on the top and bottom is determined. In Fig. 4, the total number of strips per section is four. The bare sections 181 a are cut to the same length as the sections 159 and placed on top of one another and glued to them to form a stack 185. As in previously described embodiments, mutually stacked sections of thin sheet material are glued together within the stack along alternately offset adhesive strips, whereupon the material can be expanded to form a component with open hexagonal cells, as shown in FIG. 3a shows him. The reference symbols in FIGS. 3 a and 3 b correspond to FIGS. 4 and 3.

F i g. 5, 6 and 7 show a further embodiment of the invention which can be applied to the production of honeycomb material by any of the methods described above. The sheet material 210 of FIG. 5 may be used as an example of an in accordance with the in connection with FIG. The practices described in 1 are used. The web 210 is shown equipped with parallel, transverse adhesive strips 221 on the one surface 219. This striped pattern can be achieved by running the web 210 through the engraved adhesive printing device 12 of FIG. 1 runs, whereupon it is preferably via one in FIG. 5 designated by 222 suitable drying device is performed. After the adhesive strips 222 have dried, the web is passed through a perforation zone 240 which may consist of any conventional sheet slitting or perforating mechanism such as is common in the papermaking or printing industry.

The mechanism 240 is operated to produce a plurality of parallel lines 241 of closely spaced slits or perforations. The perforated lines 241 are formed in the direction of the web axis and perpendicular to the direction of the transverse adhesive strips 221. The web is then passed through a cutting zone 224 which, for example, can operate in such a way that the web is cut in accordance with the formula given for FIG. The perforated sheets are sequentially stacked as they are cut and the adhesive strips 221 are made to adhere overlapping sheets in the stack along alternately staggered adhesive strips, as previously described. It's understandable; that a correct alignment of the sheets or sections 210 a in the stack 230 (FIG. 6) also brings the perforation lines 241 with one another in series, namely in spaced, parallel, coincident columns that extend over the entire thickness of the. Stack (from top to bottom as shown) to form a multitude of weaker, perforated scissor and / or saw guide lines in the stack.

Figure 6 shows how a stack 230 of the material can be sawed along the weaker perforated scissor lines 241 that extend through the thickness of the stack. It is advantageous to make the slots or perforations 221 approximately as wide as the saw or knife blade which is last used to saw or cut the block 230 into individual slices or sections. In so doing, the blade need only cut through or remove a relatively small percentage of solid material to completely cut one of the perforated rows, saving labor, time and equipment in cutting the block.

With certain honeycomb materials, e.g. B. those made of paper, the Arrangement of weaker perforated rows breaking off or cutting off strips without sawing or cutting through the material.

F i g. 7 finally shows the surface of a section 219 of the web 210 with the adhesive strips 221 and the longitudinal perforations 241 on an even larger scale.

Claims (2)

Claims: 1. Method for producing honeycomb material by Application of mutually parallel adhesive strips across the direction of a material web and stacking one on top of the other with adhesive strips offset from one another from layer to layer, characterized in that the continuous web material by means of a cross cutter (24, 26) divided into equal sections that determine the length of the layers that alternating sections with and sections without adhesive strips arise at the two cut edges. 2. The method according to claim 1, characterized in that that additionally bare, d. H. Adhesive, free tapes are used such that a section between each two sections of the adhesive-coated web is laid out of the adhesive-free web. Publications considered: German Interpretation document No. 1070 011; British Patent No. 832,763; French patent specification No. 1182 857; U.S. Patent Nos. 2,649,131, 2,553,054.