DE1810658A1 - Composite sheet material consisting of a corrugated - Google Patents

Abstract

Composite sheet material consists of monoaxially shrinkable film bonded to each of the opposite sides of a flexible core sheet along zones extending generally perpendicularly to the direction in which the films can shrink, the films being shrinkable in the same direction to an extent greater than that of the core sheet. The bonding zones are equidistant at intervals situated in the shrinking direction of the films, the bonding zones between one of the films and the core sheet alternating with the bonding zones between the other film and the core sheet, so that the shrinkage of the films pushes the parts of the core sheet between the adjacent bonded zones in inclined positions relative to the films, to form an undulating core sheet.

Description

Composite or laminated bodies and processes for producing the same The invention relates to a composite or layered body and a method for producing it same.

In the packaging field, corrugated board is one of the general uses been used where protection against shock and possibly heat is sought will. The impact and thermal insulation properties of corrugated cardboard have together with their structural strength and low cost. dap ß them find general application in the packaging industry.

Recently, corrugated cardboard has been in some ausmap by arrangements been displaced, which formed from plastic foams or honeycomb laminated bodies are. These newer packaging materials have just as little corrugated cardboard, like them Impact and heat insulation properties and they are all lightweight and low cost in relation to their volume and structural Strength. The transport costs for these known packaging materials ven their However, the place of manufacture to their place of use are based on their volume. Thus surrendered generally high shipping costs.

There is thus an important object on which the invention is based is to provide an improved composite material that has a low shipping volume possesses, but is able to use one for packaging purposes to occupy large space.

Another object of the invention is to a corrugated composite and packaging material with good impact and thermal insulation properties and to create structural strength, whether flattened or not corrugated state can be transported.

Another task underlying the invention is a simple and inexpensive method of making corrugated composite packaging material to create that has low material and shipping costs.

These and other objects are achieved according to the invention by a A composite product comprising a web that is shrinkable in one axis and which is connected to each connected to opposite sides of a flat flexible core, lengthways selected surfaces that are spaced apart from one another and are generally perpendicular extending to the direction in which the webs are shrinkable, the joining surfaces between one of the tracks and the core with the connecting surfaces alternate between the other of the lanes and core. The tracks are in a coarser way Extent than the core shrinkable, making a single crimping of the webs the parts of the core between adjacent joined surfaces in inclined positions relative to pushes the webs, thereby giving such a core a corrugated configuration will.

Those used in the manufacture of the composite product Lanes can be made from many suitable materials that iD capable of are to be experienced in a controlled manner and preferably to the same extent. Shrinkable materials include, for example, textiles, paper, non-staining foils and foamed plastic sheets.

In a preferred type of construction, the tracks that are used films oriented in an axis or plates oriented in an axis represent the are made of foamed thermoplastic polymers. Such in one axis Oriented foils or foamed sheets can easily be put through beaufschlageo shrink from heat, have low material costs and can be borrowed assemble the manufacture of the composite product.

The material forming the core does not need to be shrinkable. If such a core has a tendency to shrink during the intended shrinkage To contract the other webs, it is critical that their shrinkage be less extent than that of the orbits. The core can thus be made of any material be made. that can be easily pulled into a corrugated shape and this include materials such as paper, cardboard, foamed plastic, and rubber. the Flexibility of the core in a direction generally perpendicular to the longitudinal direction of which the webs are to be shrunk, is of course essential, so that it is the same is able to adopt a desired configuration. The flexibility of the core along both axes is not required and can also be avoided on purpose so as to ensure that the composite product has a desired structural Shows firmness.

The binding of the webs to the core is longitudinally selected. at a distance Surfaces lying against each other can e.g. by means of solvents, adhesives, Heat, acoustic or ultrasonic vibrations are caused. The special type of connection depends on the specific materials used in the manufacture of the composite product. However, one must work carefully to this end distortion or shrinkage of the webs and / or the core during assembly is held back.

There is a special advantage of the composite product according to the invention in that, dap the same in either the flattened or non-corrugated state as Plates or iD rolled form can be transported, taking the core of its desired corrugated shape by means of shrinking the webs into place the can be assumed for the intended application. When flattened or not corrugated the composite product occupies the smallest possible volume. Thus there is a considerable Saving in terms of shipping costs compared to conventional corrugated packaging materials.

Shrinking the webs of the composite products to cause a Corrugation of the core can be achieved in any suitable manner, depending of the special materials used.

uniaxially oriented foils or sheets formed from foamed Thermoplastic materials can be shrunk, simply by applying pressure from riärme. In such an arrangement, the two outer panels become one stable, tensioned state that keeps the core in a corrugated state, however, results in smooth and flat surfaces along opposite sides of the product.

The invention is hereinafter described, for example, with reference to FIG The accompanying drawings explain: Fig. 1 is a disgram-shaped side view a device that is used in the implementation of the method according to the invention in Application comes.

Figure 2 is a side view of the composite product of the present invention before the corrugation of the core of the same.

Figure 3 is a view similar to Figure 2 and shows this according to the invention Composite product in its corrugated state.

Figure 4 is a view similar to Figures 2 and 3 and shows a composite product according to the invention formed from foamed polymer.

When carrying out the method according to the invention using of the device shown in Fig. 1, becomes a continuous, flat core 11, Z§B. made of flexible cardboard in the direction of arrow 13 from a suitable one here output source not shown drawn and between a pair of glue discharging Rolls 15 and 17 moved. Both walls 15 and 17 extend over the width of the Core 11 and are driven in the directions of arrows 19 and 21.

It is a series of uniform, spaced apart, elongated protrusions 23 along the peripheral surface of each of the rollers 15 and 17 provided, the projections 23 of a roller relative to the projections 23 on the other of the rollers are arranged offset. It will glue to the extreme Surface 25 of the roller projections 23 applied by means of rotating brushes 27, which are immersed in a supply of material which is present in the interior of the troughs 29.

When rotating the rollers 15 and 17 in the direction of the arrows 19 and 21 is the core 11 moved forward between the same with adhesive lines on the longitudinal side in the spacing relationship to one another existing intervals at opposite Pages covered, see reference numeral 31 in FIG. 2, the adhesive lines, coat one side of the core 11 with the glue lines alternate, which are applied on the opposite side. There will be tracks 33 and 35 made of uniaxially oriented thermoplastic polymers from stock rolls 37 and 39 sucked up and on and against the opposite sides of the with glue coated core 11 guided by means of rollers 41. Pressure rollers 43 and 45, which in Direction of arrows 47 and 49 revolve, serve to securely bind ddr webs 33 and 35 to effect on the core 11 on the surfaces coated with adhesive thereof. The composite product 51 formed in this way has that shown in FIG Appear on and would normally come in rolled form or in porm of sheets collected for dispatch to the point of departure.

As soon as the composite product is ready for use or

in continuation of the procedure noted above, the same becomes the Subjected to the action of heat, for example by filtering it through an oven 53 thereby shrinking the foils 33 and 35 and the core into a corrugated configuration see Fig. 3, pull.

The composite product 55 shown in Fig. 4 is made in the same Way as described above, manufactured and different from the product 51 only because there is an ern 57 and outer webs 59, the total are formed from foamed thermoplastic polymer. The webs 59 of the composite 55 own before shrinking an appropriate level of inconsistent Orientation, while core 57 is preferably not oriented.

Claims (4)

P a t e n t a n s p r ü c h e L ". Composite film product, thus g e k e n n z e 1 c h ne t, dap it has an in-axis shrinkable web (59) which is associated with each of the two opposite sides of a flat, flexible core (11,57) length Planes that extend generally perpendicular to the direction in which the webs (59) are shrunk, the webs (59) in the same direction and to a greater extent than the core (57) can be shrunk, the connecting surfaces preferably equidistantly at intervals in the direction of the shrinkage of the ban alternating with respect to the connecting surfaces between one of these webs and the core with the connecting surfaces between the other of the webs and the core, whereby the shrinking of the webs connects the parts of the core between adjacent ones Faces in inclined positions relative to the webs and presses the core (11,57) a wavy configuration conveyed. 2. Composite film product according to claim 1, characterized in that g e -k e fl n z e i n e t, since the webs (59) are formed from thermosplestic polymer, which can be foamed and stretched in one axis so that when heated shrinkage occurs. 3. composite film product according to claims 1 or 2, characterized g e k e Notably, the webs (59) can be shrunk to practically the same extent are. 4. A method for producing the corrugated product according to one of the Claims 1 to 3, characterized in that they are shrinkable in one axis Lanes connected to each of the opposite sides of the core along the faces and you can shrink the webs.