A method of making sandwich structures

 

(57) Abstract:

Usage: the technology of layered materials for insulation against heat, sound or mechanical and mainly used in construction, as well as in the clothing industry. The method is carried out by drawing from two opposite sides of the strip of blanks 1 filler adhesive strips 2, having them two on each workpiece along its longitudinal edges and taking the width a of each of the workpiece is equal to the sum of the thickness H of the filler in a three-layer design and twice the width b of the adhesive strips. Strip the workpiece 1 is placed between the two casings 3 and 4 are parallel to one another in increments of t, no less width b of the glue strip 2, with the adhesive strip in a checkerboard pattern in the plane of the cross-section of the package. The workpiece 1 is connected with the casings 3 and 4 in places glue strips 2, and then diluted casing by longitudinal displacement one relative to the other in the direction perpendicular to the adhesive strips by moving the top of each workpiece toward one another (Fig. 1), and taking the time shift value B equal to the width a of the workpiece 1, is reduced by the thickness and twice the width b of the glue is to the technology of three-layer structures, designed for insulation against heat, sound or mechanical effects and used as building panels, as well as laminated materials for the garment industry.

A known method of making sandwich structures, including the application of parallel adhesive strips on the inner surface coverings in places suspected peaks of the corrugation filler with a step equal to the desired step of the corrugation filler, adhesive bonding coverings placed between sheet preparation, dilution plating at a distance equal to the desired thickness of the filler, while giving the sheet blank corrugated shape due to its extraction and subsequent fixation of the received forms [1].

A three-layer structure obtained in a known manner, satisfactory strength of the connection of the filler with coverings have low resistance to compression due to the inclined arrangement of the lateral sides of the corrugation relative to the casing, and increasing the resistance to compression of the filler is impossible without increasing its mass. The known method is also characterized by high technological complexity.

Closest to the invention it is the Oron sheet filler, laying on the placeholder parallel adhesive strips one-sided folds and laying placeholder in the package between the two casings with the location of the adhesive strips on the outside of the folds in a checkerboard pattern in the plane of the cross-section of the package, the adhesive bonding of the filler with coverings, breeding casing by longitudinal displacement one relative to the other in the direction perpendicular to the adhesive strips, and the fixation of the form filler [2].

The known method provides sufficient bonding strength of the filler with casings, however, not possible to obtain a three-layer structure having a high resistance to compression while reducing mass, as increasing resistance to compression of the aggregate of such structures is possible only by reducing the corrugation step, i.e., increasing the frequency of the corrugation along the length of the filler, which is accompanied by an increase in its mass. In addition, the known method is characterized by increased complexity of technology due to the need of laying on the sheet blank placeholder folds before connecting with coverings.

The aim of the invention is to increase the compression resistance and low weight requirements which I am coverings.

This objective is achieved in that according to the method of making sandwich structures, including the application of adhesive strips on opposite sides of the filler, packing filler into the package between the two casings with the location of the adhesive strips in a staggered manner in the plane of the cross-section of the package, the adhesive bonding of the filler with coverings, breeding casing by longitudinal displacement one relative to the other in the direction perpendicular to the adhesive strips, and fixation, the filler is carried out in a separate strip of blanks of a width equal to the sum of the thickness of the filler in a three-layer structure and a double-wide adhesive strips, who put two on each workpiece along its longitudinal edges of the workpiece are placed parallel to one another with a spacing not smaller width of the adhesive strip, and the displacement of the casings performed by moving the top of each workpiece toward one another and taking the offset is equal to the width of the workpiece is reduced in its thickness and twice the width of the adhesive strip.

Declare a set of distinctive features is the implementation of the filler in the form of a separate strip of blanks of a width equal to the sum of t the two on each workpiece along its longitudinal edges, stacking workpieces parallel to one another with a spacing not smaller width of the adhesive strip, the execution of the displacement plating, moving the edge of each workpiece toward one another and taking the offset is equal to the width of the workpiece is reduced in its thickness and twice the width of the adhesive strip.

Run a strip of blanks aggregate width equal to the sum of the thickness of the filler in a three-layer structure and a double-wide adhesive strips, put two on each workpiece along its longitudinal edges, stacking workpieces parallel to one another with a spacing not smaller width of the adhesive strip, and performing a displacement plating, moving the edge of each workpiece toward one another and taking the offset is equal to the width of the workpiece is reduced in its thickness and twice the width of the adhesive strip, allows to obtain a three-layer structure with the filler, in the form of walls, perpendicular to the casings, while enabling the desired increase of the spacing of the partitions. This makes it possible to increase the compression resistance of sandwich structures while reducing their weight. The proposed signs provide the application of sufficiently large castrucci by eliminating the necessity of laying down the folds on the blanks.

These advantages allow the use of the invention in products with higher requirements to the three-layer structures, such as lightweight insulating panels, experiencing the high voltage and intended for insulation against heat, sound or mechanical effects, as well as multi-layer bags for garment industry.

In Fig. 1 shows a strip billet filler, United with casings; Fig. 2 - the same, with divorced coverings.

The method is as follows.

From two opposite sides of the strip of blanks 1 aggregate thickness of applied adhesive strip 2 width b, having them two on each workpiece along its longitudinal edges (Fig. 1). Thus the width of each strip of the workpiece is equal to

a= N+ 2b, (1) where N is the required thickness of the filler in a three-layer structure (Fig. 2).

Strip the workpiece 1 is placed between the two casings 3 and 4 are parallel to one another in increments of t, no less width b of the glue strip 2, with the adhesive strip in a checkerboard pattern in the plane of the cross-section of the package (Fig. 1). The workpiece 1 is connected with the casings 3 and 4 by hot pressing in masteralloy, perpendicular to the adhesive strips by moving the top of each workpiece toward one another (Fig. 1) and taking the amount of displacement (Fig. 2) is equal to

In=a - 2b. (2)

The result is a bending of the strip of blanks in areas adjacent to the adhesive strips, and under the action occurring in the blanks elastic forces plating divorce in the transverse direction (Fig. 2). This billet form perpendicular to the casings 3 and 4 partitions 5 height H equal to the desired thickness of the filler located on the step t. The obtained three-layer structure is subjected to normal for used material handling for fixing the shape of the fill.

As the strip of blanks filler sandwich structures using a wide range of flexible sheet materials, such as fabric and knitted fabrics of various fibrous composition, in particular, on the basis of optical fibers, and nonwoven and film materials, flexible cellular plastics. A covering made of a lightweight plastic sheets, and flexible sheet materials, for example, knitted fabrics, non-woven film and paintings. For applying adhesive strips applied various adhesive materials depending on Mau press equipment or calenders. Fixing the form sandwich structures can be carried out by impregnation of the binder with its subsequent hardening by heat treatment. When used as blanks of thermoplastic materials (e.g., fabrics made of synthetic fibers, film, paintings, cellular plastics) fixation can be carried out thermally by transferring the material in a highly elastic state, followed by the transition when cooled.

The proposed three-layer structure can be obtained in the form of separate panels contour or continuous manner in the form of laminated canvas.

P R I m m e R. Fabricate three-layer design that is used as insulation panels. From two opposite sides of the strip of blanks of flexible polyurethane foam width a=25 mm and thickness =4 mm is applied strip of adhesive polyamide coating width b=5 mm, having them two on each workpiece along its longitudinal edges. The workpiece is placed between the two casings of the fabric with a polymer coating in parallel to each other with a step of t=30 mm, with adhesive strips in a staggered manner in the plane of the cross-section of the package, and combined with coverings of grief is sustained fashion in another direction, perpendicular to the adhesive strips by moving the top of each workpiece toward one another and taking the amount of displacement In=11 mm, after which a three-layer structure is subjected to heating to 180aboutWith subsequent cooling at 20aboutFor fixation of the form filler. The result is a three-layer construction with an aggregate thickness of H=15 mm, made in the form of perpendicular walls with step t=30 mm

The obtained three-layer structure has a higher compressive strength in comparison with the prototype, with the same geometrical parameters N, t, b, and , because of its partition placeholder perpendicular to the casing in opposed walls of the prototype, located to the casing at an angle 56about. The mass of the filler obtained three-layer structure is lower in comparison with the prototype by 46% . The strength of the connection of the filler with the covers preserved at the level of the prototype, since the parameters t and b (i.e., the step width of the adhesive joints) in the two structures have the same values. In addition, obtaining a three-layer structure of this example is characterized by a significantly lower complexity and the complexity of the technology, because it does not require OPE the th and strip blanks, the width b of the adhesive strips and the thickness H of the filler is unacceptable because it leads to the impossibility of obtaining a three-layer structures with the required thickness H of the filler. It is also unacceptable violation of the relation (2) between the amount of displacement of the casings, the width and thickness of the workpieces and the width b of the adhesive strips, as this leads to the formation of the partitions, not perpendicular to the casings. The violation of the relation between step t stacking of workpieces and the width b of the adhesive strips (tb) is technologically impossible.

The invention improves the quality and reliability of the three-layered insulating structures, reducing their weight and material consumption, as well as reducing the cost and complexity of manufacturing. The method does not require the use of complex equipment, it is easy mechanization and automation, creates prerequisites for processing a strip of waste sheet materials.

A METHOD of MAKING SANDWICH STRUCTURES, including the application of adhesive strips on opposite sides of the filler, packing filler into the package between the two casings with the location of the adhesive strips in a staggered manner in the plane of the cross-section of the package, the adhesive connection, fill in the, erpendicular adhesive strips, and fixation, characterized in that as aggregate use strip harvesting width equal to the sum of the thickness of the filler in a three-layer structure and a double-wide adhesive strips that are two on each workpiece along its longitudinal edges of the workpiece are placed parallel to one another with a spacing not smaller width of the adhesive strip, and the displacement of the casings performed by moving the top of each workpiece toward one another and taking the offset is equal to the width of the workpiece is reduced in its thickness and twice the width of the adhesive strip.

 

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