DE2008441A1 - Process for the production of large-capacity containers from layers of polyester resins and containers produced by this process - Google Patents

Description

PATENTANWÄLTE DIPI * IKTG. C. STOBPEIi · DIPIi. ING. W. GOIiIi ^- WITZXiR DIPIi. ING.

674 LANDAC / PALATINATE AH SCHÜTZBNHOF

POITICHICKl ti IUDWICI BHAFEIi ■ »101 · BANKl HBVTBCHB BAITK 67« AAlTDAV-X ¹ PALZ

Frangeco, 92 Puteaux / France

"Process for the production of large-capacity containers from layers of Polyester resins and containers made by this process "

The invention relates to a method for producing subdivided large-capacity containers made of layers of synthetic resins and also has the large-capacity containers produced by the method according to the invention itself to the subject.

The production of large-capacity containers from layers of synthetic resin is currently generally carried out by a so-called winding process, also by way of contact processes or with the aid of a process using a cuff. The cuff is molded onto a mandrel and then forms the container body. The floors and the built-in components designed as flow breakers are then inserted into the hollow body produced as indicated and adhered to it, e.g. B. connected by gluing.

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This type of production makes difficulties, especially when fixing the floors in the correct position within the hollow body and with regard to their connection to the hollow body, which takes place by gluing. In many cases, the floors are partially detached and leaks occur and leakage losses. In addition, the tools required for the production and in particular the mandrel body have very large dimensions, are therefore difficult to manufacture and maintain. Finally, a fast workflow is not guaranteed with the production methods known up to now.

If the large-capacity containers are intended for the storage or transport of aggressive chemical substances or of foodstuffs and luxury items, it may be necessary to make the bases, the partitions and the inner surface of the hollow body, insofar as they come into contact with the named products, from another Produce plastic than from that from which the hollow body itself consists. The surfaces mentioned must in particular have good resistance properties to chemical corrosion and furthermore exclude any impairment of taste and, finally, they must be easy to clean. The outer casing or the outer surface of the hollow body, on the other hand, must have particularly high mechanical resistance (resistance to the dead weight of the stored liquid and , if the containers are for tank wagons, also to high dynamic loads).

The inner surface that comes into contact with the liquid to be stored can also be specially designed in order to ensure better tightness (resistance to the formation of bites and, in particular, to exudation).

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In the method according to the invention, as far as it is on the one hand to the surfaces that come into contact with the liquid and, on the other hand, to the outer shell, a separate production of the Large capacity container or a production in two time periods of the surfaces provided.

According to the invention, the internal components, namely partition walls, Impact and guide surfaces as well as the inner skin by winding under tension the outer, resistant envelope against the outer wall compressed. Such an approach makes it possible, though to create a unit made up of individual parts that is nevertheless homogeneous and has high mechanical resistance.

To eliminate the disadvantages, uie the classic manufacturing techniques adhere and in order to achieve novel advantages, both in terms of manufacture and use, will be the following novel approach proposed:

1. The floors and other built-in components such as impact and guide surfaces, by the selection of the materials (resin and reinforcing fibers), as well as by their properties and shapes for the individual case required chemical, hygienic and mechanical resistance conditions meet, are separated in a manner known per se on a mold in a vacuum, with the press or with the use of others suitable process.

In a first embodiment of the invention, these have floors and inserts in their center an opening that serves to put them in their desired position Bringing, holding, centering and provisionally fixing on a pipe or a support spindle that is to be placed in relation to other parts belong to the rewinder.

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2. The inner surface or lining of the container jacket is made up of one or more parts under the usual conditions produced a simple shape, that of the large-capacity container to be produced is equivalent to.

3. The partitions, fixtures and floors are centered and attached to the support tube or the support spindle so to achieve the desired subdivision and closure of the large container. The unit is then mounted on a winding machine.

4. The later inner lining is used as a sheathing the partition walls and floors are raised and then finally attached to these * fixed by gluing.

5. The seams between the elements of the future inner lining of the large capacity container are made using multi-layer tapes or other suitable under Heat welded tapes made tight.

6. The inner casing is pressed onto the edges of the partition walls, floors and other fixtures with the help of tires, which can be removed after hardening or by gluing on final pressure-generating sheathing tapes, which are wound up by winding and reinforce the coat by creating resistant rings in the affected areas.

The homogeneous unit achieved in this way already represents a uniform structure in which the final large-capacity container is embodied in its total volume, its subdivision, its distribution of the partition walls, its built-in components and floors.

At this point in time , the named unit can, if necessary, be subjected to firing or stabilization operations in the furnace, which are due to the particularity of the materials used or the desired properties -

0 09837/1948

th may be necessary.

In addition, this unit already has such rigidity and such a resistance to mechanical stress that they applied to the winding machine, the tension of the threads, tapes or can withstand strips wound to form the outer jacket according to the invention.

7. This unit, mounted on the winding machine, is set in rotation, with the ends of the spindle protruding from the machine make this work easier.

8. The outer covering is made by winding threads, Bands or strips formed, which are tensioned accordingly and a proper connection with the inner jacket as well as an effective Bring this jacket together.

Such a procedure that is necessary for the method according to the invention is characteristic, it makes it possible to omit the rigid mandrel, which is used to wrap the large-capacity container under the previously usual circumstances to shape and to maintain the form given.

9. Then, pulled out the spindle and the passage of the spindle through the floors, partitions and moreover installation "- are bonded by suitable trained meet plugs th permitting openings preferably rounded Händer have.

In this way, the invention makes it possible in particular to dispense with the large, classic winding mandrel. At the same time , the later introduction and the difficult , random-dependent gluing of the floors and fixtures in the hollow body produced on the mandrel is eliminated.

009837 / 1S48

It is also possible to use the inner and outer parts of the envelope or to adapt the hollow body to the special conditions of each application, through careful selection the different materials used.

The outer surface of a large-capacity container produced in this way is evenly. As a result, such containers cannot be put on the market as they arise in production. Finishing work such as puttying and sanding must be done before a layer of paint is applied.

But since the compatibility between the polyester layers and If the spatula, the finish and the paint are not perfect, there is a risk that these layers will peel off. On the other hand is the surface porosity the layers of polyester resins a reason for the retention of solvents contained in these applied materials, spatulas and color are present, solvents, their subsequent evaporation brings about defects under the dense layer of paint, such as the appearance of blisters or flaking.

After all, the work steps of smoothing, sanding, finishing and painting have a rather manual and operational nature of handicraft accompanying character that does not get along well with industrial production that is more efficient and economical.

The invention aims at means to eliminate these disadvantages, because the large capacity container, which is produced in the raw state, is provided with a casing or external decoration, which itself consists of elements which are preferably made of polyester layer material and dL e individually by means of contact deformation a form to be prepared that corresponds to the curved portion of the container, either after or. Such a Ummahtelung

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accordingly consists of assembling a certain number of Elements glued, for example, with the help of a polyester resin are, whereby the necessary adhesive pressure is best achieved by winding threads. For this operation it can be most beneficial the same winding machine can be used that has already been used to produce the outer casing of the large-capacity container.

In a modified embodiment of the invention, the positioning, the centering of the floors and other built-in components can be carried out as well as sticking to the inner skin by the classic means be guided without it being necessary to use a mandrel which passes through the entirety of the body of the bulk container. To this Purposes, the circulation for the winding operations can be carried out from parts that have the Bolle von Dre '~ nfen, which are directly on the outer bottoms or lids are attached. This makes a noticeable Simplification of manufacture achieved, and the tools to be used can be designed more easily.

Further features and advantages of the invention emerge from the following description of two embodiments shown schematically in the accompanying drawings.

Fig. 1 shows schematically a Herge according to the invention

depicted large-capacity containers in a vertical longitudinal section,

Figure 2 is a section through the container along the line

II-IIderFig, 1,

Fig. 3 is a place in the invention using

Shape again,

009837/1948

Fig. 4 leaves more details on the use of the

according to the invention provided centering rod zumjvorl on holding the floors, partitions and other built-in components of the large-capacity container,

Fig. 5 shows a longitudinal section on an enlarged scale

through the end part of a finished large capacity container, and

Fig. 6 leaves a second embodiment of the Großraumbe

recognize holder in cross section.

In Fig. 1, 1 denotes the front bottom or lid of the large-capacity container. 2 is the rear floor, 3, 4 are separating partition walls,

5 is an installation in the form of a flow-breaking impact or guide body »

6 is the jacket forming the body of the container. 7 are filling openings that all manholes can be formed and used. 8 are the drainage ports. The large-capacity container is divided in this way into the compartments or chambers 9, 10, 11.

According to the invention and as already explained above, the as

The whole with 6 designated jacket of the large-capacity container from a .inneren

ge lining 13. This is preferably made of two parts that go through a median plane X-X are separated. The inner jacket is especially designed to withstand chemical attack and a facilitated one To enable cleaning, while the outer jacket 14 essentially does so serves to give the large capacity container the necessary mechanical stability.

In Fig. 2, 17 denotes the openings in the guide body 5 are arranged and ensure the connection between the two parts of the chambers 9, which in the example shown by this

009837/1948

Guide bodies are separated.

Fig. 3 shows how, for example, the two halves of the inner liner 13 can be made by using a mold 16 of the type shown in paragraph 2 of the previous discussion is.

Phases 3 and 4 of the process are shown in FIG. here it can be seen that the bases or covers 1 and 2 and the illustrated Partitions 3 and 4 made using any known method prefabricated and all provided with a central opening 15 on a centering rod 18 can be brought into position, centered and fastened, the centering rod can be set in rotation by a pair of gears, which is shown schematically at 19 in FIG. 4. After the two halves of the jacket 13 have been applied to the elements 1, 2, 3, 4, the unit 1, 2, 3, 4.13 circulated around the application of the wound and bonded printing tapes 24 to allow.

From Fig. 5, which shows the finished large container, it can be seen that after the production of the outer mechanical stress-resistant envelope 14 by winding on the inner surface 13 in this pressure bands 24 are embedded in the same thickness, the openings 15, the preferably curved bands must all be closed by plug 27 . In this figure, 28 are the bonding places of the floors, partitions and guide bodies on the inside of the inner jacket 13 is indicated.

In the embodiment of the container shown in FIG. 6, the inner shell 13 consists of prefabricated, composite elements, the outer shell 14 of which is achieved by a winding process. Here the jacket also has a wall-like installation 5 which is penetrated by a central opening 15 and which also has connecting openings 17.

In this modified version, the large-capacity container is covered by glued-on connecting elements 30, 31 , which for example

009837/1948

Contain recesses which correspond to the filling tubes, such as in FIG. 7. The elements 30, 31 consist primarily of polyester layer material and are glued with the help of a polyester resin. You make that Outer surface of the completed large-capacity container and can be of any color and have any desired inscriptions or decorations, which were achieved, for example, during their production by spraying on a pigmented gel coat.

As shown, the elements mentioned form after they are glued together a homogeneous whole with the large-capacity container, which is then completely made up of layers of polyester material through successive Consists of envelopes, each of which fulfills its task, namely to form:

- a dense inner jacket or a dense inner skin that chemically is resilient;

- An intermediate layer produced by a winding process, which the ensures mechanical resistance and

- an outer casing or skin, which the finished container its desired surface of sufficient resistance to the effects of weather and to aging as a result of exposure to the sun offers.

The manufactured and trained in the manner described Large capacity container can be completely covered. The cladding elements glued on can, for example, only be provided on the flanks be.

The invention is not limited to the particular shape of the container described and shown only as an example. In particular, can its shape can be round, elliptical or trapezoidal. Its dimensions and

009837/1948

Proportions can be of any kind / just like the internal arrangement.

As for the inner jacket, the bottoms and the guide body (s), Plastics other than sheet materials, and in particular thermoplastic materials, can also be used as the invention is independent of the materials used for its implementation.

0 0 9837/1948

Claims (9)

Patent claims: 1.) J Process for the production of large-capacity containers ν— ' Layers of polyester material, characterized in that on the on one side the container walls and surfaces coming into contact with the liquid to be stacked in the container and on the other Side of the outer shell of the container can be produced in separate operations. 2.) The method according to claim 1, characterized in that the inner structure, namely partition walls, guide body, inner skin by winding the outer covering are connected to this under tension by a type of shrinking process. 3.) Process according to claims 1 and 2, characterized by the following successive work stages: a) floors, partitions and guide bodies, which are determined by material selection (Resin and reinforcing fibers), as well as chemical, hygienic ones through appropriate strength and shape and mechanical requirements of each case, are separated on a form in known Manufactured in a manner using vacuum technology, pressing or any other suitable method Method whereby these floors and fixtures have a central opening for temporary installation, for centering and are used for fastening on a pipe or on a support spindle assigned to the winding machine; b) the inner surface or shell of the boiler shell is made from one or more parts under the usual conditions on a simple. the form of the large-capacity 00 to be produced 9 837 / '1948 container corresponding shape created; c) the partition walls, guide bodies and floors are on one Support tube · or a support spindle arranged, centered · and fastened in order to achieve the desired subdivision and the To achieve completion of the large-capacity container and then the entire unit is mounted on the winding machine; d) the inner surface or inner shell is attached to the partitions and floors applied and then attached to these by gluing; . e) the seams between the elements of the inner Casings are sealed using laminated tapes or suitable heat-sealed tapes; f) the inner shell is placed on the edges of the partition walls, floors and guide bodies pressed on with the aid of outer rings, which are removed after hardening, or by gluing of final remaining tires that are created by winding and that cover the shell by creation reinforce of rings placed in the respective zones; g) this whole, which is applied to a "winding machine is being put into circulation, with the outstanding Ends of the spindle make this work easier; h) the outer covering is made by winding threads, Ribbons or strips are formed, which are wound under a suitable tension, whereby a proper connection with the inner cover is ensured, as well as a effective β compression of this shell; 009837/1948 i) the spindle is pulled out and the one for your Passage in the floors, partitions and baffles provided openings, which are preferably have rounded edges, are closed by fitting stuck-on plugs. Process according to Claim 3, characterized in that the overall internal installation between phases 6 and 7 is firing or stabilizing operations is subjected in the oven. 5.) Process according to claims 1 to 4, characterized in that the large-capacity container is at least partially by connecting elements is covered, which themselves consist of polyester layer material, which are glued to the edges. 6.) Method according to claim 5, characterized in that the cladding elements are glued on with the help of a polyester resin. 7.) Process according to claims 5, 6, characterized in that the cladding elements of any color from the manufacture bear any desired inscriptions or decorations. 8.) The method according to claim 7, characterized in that the Inscription / or decorations of the cladding elements can be achieved by spraying on a pigmented gel coat. 9.) Manufacturing process for large-capacity containers according to the claims 1 to 3, characterized in that the central removable spindle, which runs through all fixtures (walls, floors and guide bodies) replacing simple pivot pins that are detachably attached to the end walls. 009837/1948 - ¹⁵ ~ 20084A1 IQ ".) Large capacity container made of polyester laminate material or
analogous synthetic resins, in particular from thermoplastic materials, which are produced using the method according to claims 1 to 9. 009837/1948 Blank page