DE1611632A1 - Equipment for the manufacture of containers - Google Patents

Description

ff. Willioim Koicbei

Frankfuri / Main-l

Parksl £ oßel3 5353

International Paper Company, New York, IT.Y./USA

Device for the production of containers

The invention relates to a device for manufacturing of cardboard containers, especially the manufacture of the bottom closure of cardboard or cardboard boxes.

Cardboard containers are used extensively for packaging a variety of products, including food and beverages, and one such known cardboard container is the so-called gable-top container disclosed in U.S. Patent 2,750,095 * is shown. Such containers are typically made from blanks or blanks with a predetermined geometric shape erected or erected, which are cut from a roll of a paper sheet raw material, which has a coating of a thermoplastic protective material such as wax or polyethylene. On the blanks embossed lines are also pressed in to cover the upper closure, bottom closure and side wall elements of the stand Limit the container. Usually a cardboard box of this type is assembled on an automatic machine, by folding the blank into a tubular body open at both ends and sealing the bottom closure walls of the blank are sealed together, the container is filled with the desired product and finally the closure walls the gable-like top of the blank are sealed together.

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Since the bottom of a cardboard container is particularly easy to damage, it is very important to make the bottom seal of the container lter so that it has sufficient strength and leak resistance to ensure the durability of the container even under rough use or treatment. One of the most important factors in the formation of a bottom closure is that a sufficient leak-tightness and Sterke in the arrangement of Boderj.verschlußw ^£: is provided .nrte. Another important factor in making a bottom stopper with sufficient strength and leak resistance is the manner in which the bottom stopper walls are sealed together. US Pat. No. 2,357,535 shows a known arrangement for sealing the bottom closure walls together in which a container blank, which has previously been deformed into a tubular body open at both ends, is placed on a mandrel with the bottom closure walls over one end of the mandrel and a pressure stamp is pressed against the bottom flaps folded over the mandrel end at a desired pressure. In the case of containers made of cardboard raw material which is coated with a heat and pressure sensitive thermoplastic material, the heat supply makes the thermoplastic coating of the bottom closure walls sticky, so that the subsequent application of pressure by the pressure stamp effects a more effective sealing of those sections of the bottom closure walls, that are printed in contact with each other.

As a result of the folding of the various walls that form the bottom closure assembly, are folded between the Layers of cardboard in the bottom closure arrangement are potential

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Leak paths generated for the packaged liquids. One Measure to prevent leakage or leakage this 3ahnen is described in the US patent specification 3,120,335, according to which an increased pressure during the sealing process is exerted on selected areas of the ground in order to form depressions or elevations on these areas, which the block potential leakage paths. Increased pressure can be applied to selected surfaces of a container during the sealing Process are exercised in that the surface of the mandrel end executed flat or flat and the surface of the plunger se is such that it has raised areas and protruding Has pressure pins. In this way will be upon those Sections of the bottom closure assembly between the mandrel end and the raised surfaces and pins of the plunger are pressed in, a greater pressure exerted than on any other portion of the bottom closure assembly. At this Arrangement, however, it is necessary to put the pressure stack on align the mandrel end within fairly tight tolerances, since relatively small misalignments require the use of a result in increased pressure on sections of the floor which do not need it and "the increased pressure not applied to those sections of the soil, that require him. If you also make the surface of the end of the mandrel flat and the surface of the pressure pin with it Provides raised surfaces, there is when a pressure is exerted on the bottom closure walls between the: mandrel and the pressure stamp, the risk that overlapping layers of the bottom closure elements Press outwards, i.e. towards the outside of the container, in all places where the flat mandrel ends not raised or undercut or is opposite the recessed center of the ram, whereby bulges are formed on the outer surface of the container bottom. These bulges at the bottom of the completed Containers are undesirable, but they are very likely wear and tear even more,

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than other sections of the ground. The presence of Bulges on the container bottom also brings with it the risk that the container becomes somewhat unstable, which is not only an undesirable one from the standpoint of consumer wishes

Property is, but also subject to excessive wear and tear and wear and tear on the container bottom.

In accordance with the present invention, a novel mandrel and ram assembly is provided which creates a strong, leak-proof bottom seal having a relatively flat outer surface without the need for very precise alignment between the mandrel end and the ram or pad The plunger according to the invention is perfectly flat, with the exception of the protruding pressure pins, and the surface of the opposite end of the mandrel is divided into a pattern of recessed and non-recessed areas according to the pattern or arrangement of the multilayer areas of different thicknesses in a special folded bottom closure . A pressure exerted on the bottom sealing walls between the end of the drone and the plunger according to the invention tends to push the overlapping layers of the bottom sealing elements inwards, ie in the direction of the interior of the container, at all points where the facing recessed or undercut sections of the surface of the end of the mandrel. Due to this construction, bulges that may have formed occur in the interior of the container, where they do not impair the stability or durability of the container. Furthermore, since the tubular cardboard blank is arranged on the end of the mandrel v.'ira, before the operator lock is sealed, the g of the llustc-ra of recessed and non-recessed · '

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Areas in the surface of the mandrel end instead of in the The surface of the pressure stamp is more inevitable and flawless Alignment between-the pattern of the overlapping Layers of various thicknesses in the folded bottom seal and the corresponding recessed and non-recessed Areas achieved. This more positive or inevitable alignment not only leads to the more precise application the increased pressure on those sections of the floor that need it, resulting in better sealing of the floor sealing elements causes, but also creates a precise alignment between the plunger and the mandrel end considerably less difficult.

The more inevitable alignment between the overlapping ones Iggen of various thickness in the folded bottom seal and the recessed and non-recessed sections of the DornendfH before it also allows that the protruding pressure pins in the Druokstempel the potential leak paths more effective can block. In addition, a more effective blocking is due to the formation of a relatively flat outer Plane achieved on the bottom closure, which makes it possible that dfe pressure pins in the pressure ram relatively evenly can penetrate into the outer surface of the container bottom, instead of differently via "steps" or splits in the bulged portions of the outer surface of conventionally designed bottom seals.

Another important feature of the pressure stamp according to the invention is that the protruding pressure pins be designed so that they have special knife edges to potentially leak paths in different folds in to block the bottom sealing walls. Each of these

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Pins, which "have to reach particularly remote potential luckbnhneri, are therefore provided with a relatively sharp hessian edge, which has two essentially flat sides that enclose an angle of about 90 ^w and have a greater height than all other pins. Those Pins that exert a weakened force, e.g. those near the pins with the relatively sharp knife edges, are also provided with completely rounded edges, that is, they have an approximately semicircular cross-section and a slightly greater height than the pins other pens, with the exception of the pens with the relatively sharp measuring edges, to make effective use of the reduced power available.

Those skilled in the art can refer to the description below and the accompanying drawings readily infer that the principles of the invention are advantageous also in the Manufacture of 3odenvar connections can be applied that have different arrangements, sizes and materials exhibit.

The invention will now also be described in detail with reference to the accompanying drawings, all of which are derived from FIG Description and the figures emerging details or features to solve the problem within the meaning of the invention can contribute and were included in the application with the intention of being patented. Show it:

Lush. 1 is a sectional view of a mandrel and ram assembly according to the invention including a sectional view of a folded bottom closure which is placed on the end of the. mandrel is put on;

• Pig. FIG. 2 is a top plan view of the surface of a mandrel end according to FIG the invention; - -

Fi ^. 3 is a plan view of the surface of a DruckstempeIs ^getn!; ß of the invention and

Pig. 4, 5 and 6 are partial sectional views showing the special features of the various knife edges with which the printing liquors are provided with printing stencils according to the invention. are.

It will now avif the pig. 1, 2 and 3 are referred to. Pig 1 Figure 10 shows a container 10 which is placed on the end 12 of a mandrel 120 is placed, with a print stack 11 above the sealed bottom closure 100 of the container 10 is located. Details of a complete container making machine, in which the mandrel 120 and the ram 11 may be used are omitted as a mandrel and ram assembly used in conjunction with various types of container manufacturing equipment in accordance with the invention including the guidance shown in U.S. Patent 2,357,535, referenced above is.

The mandrel 120 can be provided with a hollow interior 121 in connection with holes 126 in the end of the in Pig. shown mandrel 120 is and inserted by means of the compressed air v / ground to detach a container from the dome after the bottom closure has been sealed * It will be understood that Buch used other procedures familiar to the Pachraann can be used to solve a container from de ::: Dom su *

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'The end 12 of the dome 120 has an outer surface, which is divided into a selected pattern of recessed and non-recessed areas, and the sectional views of the surface of the mandrel end 12 and of the plunger 11 are shown along the section lines 1-1 in FIG Figures 2 and 3 out. Compared to the. Outer surface of the At the end of the mandrel 12 is the plunger 11, which has a completely flat surface, with the exception the protruding pressure pins 111a, 111b, 112a, 112b, 113a, 113b, 1Ha, 1Hb, 115a, 115b, 116a, 116b, 117a, 117b, so that, if the pressure stamp 11 against a bottom seal of a on the container placed on the mandrel end 12, any in the finished bottom versc. luß 100 trained Bulges appear inside the container, with the outside surface of the container bottom being fairly flat. It is noted that the alignment of the die 11 and the mandrel end 12 in Fig. 1 is achieved by that the upper part of the push button 11, as in Pig. 3 is shown above the lower portion of the dome 120 of FIG Fig. 2 is set so that the center lines 1-1 coincide in the two drawings.

The particular shape of the recessed and non-recessed areas in the outer surface of the mandrel end 12 depends, of course on the shapes, thicknesses and patterns of the folded bottom lock panels that make up the bottom lock assembly of the compiled container form. In Fig. 2, the areas labeled A, B and C represent the parts of the Dornendes 12 represent, which under the surface S by different Dimensions are let in, the exact dimensions depend on the thickness of the cardboard raw materials and the number of them overlapping layers or plies in the folded bottom ' Unhook the lock. A suitable Sdz of values for A, B '' and C for a container having a bottom spool assembly of the type shown in the drawings, for example given below:

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Table 1

A - 0.016 in. ο, 4 mm
B - 0.032 in "o.8 mm
C - 0.048 in "1.2 mm

The circle symbols 125 - 1 to 125 - 4 in Pig. 2 places also represent a number of recessed areas of depth D to provide pressure relief at each of a corresponding number of creating points where there is a high concentration of stress prevails ·. Such points are typically where inner cardboard walls are folded into multiple layers and on Points inside the container come together to exert a pressure against a single sheet of cardboard, which the forms the outer layer of the container bottom. In the bottom lock assembly shown, there are four major high points Stress concentration present, and at these points are the recessed areas 125-1 to 125-4 in the surface of the mandrel end in Pig. 2 provided. On these At points, the depth D of the recessed areas 125-1 through 125-4 can be about 1.6 mm (0.062 inches).

The mandrel end 12 is shown in Figures 1 and 2 as a separate cap attached to the mandrel 120 by means of cap screws 122a and 122b and dowel pins 123a and 123b. It is understood, however, that the mandrel 120 can be designed such that the mandrel end 12 forms a part with the remainder of the mandrel 120. If desired, openings 124a and 124b may be made through the mandrel end to permit the drainage of solvents or other solutions applied to clean the container manufacturing facility.

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As already emphasized, the pressure stamp 11 has a completely flat surface, with the exception of the abFt-iher.cen pressure pins 111a to 117a and 11b to 117b. These pins can be made from cylindrical torches 31 '' earth ..., before. den_n each in a messerföriaigen or forr.werkzeug3rtigen cutting edge ends, the special ^T i orm ^erh-: lt, v / this IE hereinafter in conjunction with the I ¹ Ig. 4, 5 and 6 will be explained. Each pin is located at a selected point on the ram 11 by placing each cylindrical part in an opening at a selected point on the printing press stack in which the cylindrical parts are secured by either an interference fit, keyway, or other boksnnfce method v / can ground. The selection of the points at which the pins will be placed depends on the location of the potential leakage pathways in the bottom closure assembly, where an increased pressure is desired to be applied in order to compress the cardboard layers and thereby block the potential leakage pathway. Such webs appear first along folds in the bottom walls and along the inner edges of the bottom walls. In the case of the I ¹ Xg. 3, the pressure pins 11 shown in FIG. is.

The height of each mass edge above the surface of the plunger 11 depends on the depth by which the edge is to penetrate the outer PIs before the container bottom in order to compress the cardboard layers that form the potential leak path?!. I ¹ Ur a relatively small penetration

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GC-Hi (Jt eir. Herkonnlicker Iiesserrand 41 with a rectangular viu ^: "s-: cut, as it is shown in Pig. 4. For a deep penetration it is desirable, however, a relatively sharp Heenerrand, with two flat sides to use, never include a Yiir.kcl of about 90 ° and lie at a sufficient height above the surface of the pressure stamp: to cut through the first layer of cardboard and reach a particularly secluded leakage channel within a black fold in the interior of the container base such Hesserrand 43 is shown in Fig. 6, and in Yerbii.u ng with the particular Bodenanoranung as strength in the ^T i. 1, 2 'and 5 is geseilt ,, can utifte 111a and 111b with that I err less andf or τη provided.

Another Ilesserrandkcnstrukti.n is shown in Fig. 5, in which the Ilesserrand 42 is completely rounded and has an approximately semicircular cross-section (a half> ^: Irish Permian). This lesser edge can be used where a reduced force is available, and to paxipelijgen in the interior of the formed 3 older soil, as can be the case for example with pins that are arranged tightly up pins that the 6 can be provided as pins 112a and 112b in the plunger 11 with the knife edge shape 42, where pins 111a and 111b with a knife edge shape 43 are present. The height of the pins 112a and 112b may be midway between the height of the flat penetration pins with conventional rectangular hats 41 and the height of the pins with deep penetrating knives 43. As indicated in FIG. 1, the pressure ram can be provided with a suitable adjustment device, for example adjusting screws 119, behind the pins, so that the height of the pins can be adjusted as desired.

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In addition, the interior of the plunger 11 with a The usual system of chambers 110 can be provided in order to receive a flow of cooling water which pushes the pressure ram 11 keeps at a desired temperature «

The idioms and expressions used above serve only to describe the exemplary embodiment and do not limit the subject matter of the invention. It is furthermore pointed out that within the scope of the claimed invention numerous changes are possible.

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Claims (3)

Patent discussions 1. Mandrel and plunger device for sealing the bottom closure elements of a Pa pp el) he s, ge ke η η-draws - through several mandrels. (120), each of which has a mandrel cap (12), the outer surface of which is divided into a predetermined shape of areas (A, B, G, S), selected ones (A, B, O) being recessed at different depths are, in order to correspond to the shape of the multi-layer areas of different thicknesses of a predetermined container bottom closure arrangement (100) in their folded position, a pressure ram (11) assigned to each mandrel cap (1.2) for cooperation for exerting pressures of selected magnitudes on the bottom closure arrangement (100), which is inserted between the mandrel cap and the plunger, the plunger being provided with a completely flat surface that faces the outer surface of the mandrel cap, and by a plurality of protruding pressure pins (111a - 117a _f 111b - 117b) which at selected points in the surface are arranged and exert increased pressure on corresponding points in the bottom closure assembly (100). 2. Device according to claim 1, characterized in that that the protruding pressure pins (111a-117a, 111b-117b) are provided with a spar element (31) which at one end in a knife edge (41, 42, 43) of predetermined • Form ends, and that the spar elements (31) in complementary recesses in the surface of the plunger (11) in such a way are fitted so that the knife edge protrudes over the surface 'of the pressure ram by a predetermined amount. 009884/0057 - 3. Device according to claim 1 or 2, characterized marked that the other end adjusting screws (119) assigned to the rail elements (31) Are seen through which the extent can be adjusted ura that the knife edge (41, 42 or 43) over the surface of the plunger (11) protrudes. 4. Device according to claim 1 or "2, characterized in that the knife edge (43) has two flat sides (Mg. 6) which enclose an angle of about 90 °. 5. Device according to claim 1 or 2, since you d ur c h characterized in that the knife band (42) has an approximately semicircular cross-section (Pig. 5). 6. Device according to one or more of the preceding Claims, characterized in that g e k e η η ζ e i c h η e t, that the pressure pins (111a-117a, 111b-1T7b) in pairs centlong the edges of the folded over sentence of the various boaen walls are arranged, which the 3o deliver final arrangement (100) form. 7. Device according to one or more of the preceding Address, characterized in that the knife edge (41, 42, 43) of each pressure pin is arranged at a right angle, creating potential leakage paths or channels in the bottom closure assembly (100) can be shut off or blocked. 009884/0057 -15- ■ "- ■ '■".' ■■. "8th. Device rrach one or more of the preceding indications, d α by cn g e ken η aeich η et, that a tubular container blank is arranged on each of the numerous rotatable boreholes (120) in such a way that the bottom . yerseklüßeleraente the tubular container blanks protrude over the dae £ me of the dome, so that! λ. the bottom closure elements can be folded over the I3nd of the dome so that the. The surface of the borehole end (12) is divided into recessed and non-recessed areas (A, B, C, SV), according to a predetermined pattern of areas of the. overlapping layers of different thicknesses in the folded bottom closure (100) of the container (10) so that the completely flat surface of the printing stone pel (11) is successively opposed to the end (12) of each mandrel (120) when you see the mandrels rotate in order in cooperation with the mandrels, the folded Bcdenverschlußelemente by applying pressures of selected size to the folded bottom closure elements between the / 5ornende and to seal the plunger with each other, by the completely flat Fl before ^v of the pressure * - stempeis the outer surface of the sealed Bottom of the Be »hr ^! lters _: (10) is carried out essentially flat, with the exception of the points at which the protruding pressure pins ■ (111a - t17a, 111b - 117b) press into the bottom of the container * 9. Device according to claim. 8, d a du rc h g e k e; η η-draws, that 'one pre-voted. Number of omitted Areas (125-1, 125-4) in the surface of the mandrel end (12) is provided to reduce the pressure at each of a plurality of corresponding points of high stress concentration / in the folded bottom (100) of the container (10). BATH ORIGINAL 0O9884 / Q05J