DE3141410A1 - PLASTIC PRODUCT AND METHOD FOR THE PRODUCTION THEREOF - Google Patents

Description

HOFFMANN · EliLE Ä ^ ARTNEir 3141410

PATENT LAWYERS DR. ING. E. HOFFMANN (1930-197Ä) DIPL.-ING. W. EITLE - DR.RER. NAT. ^ HOFFMANN · Dl PL.-ING. W. LEHN

DIPL.-ING. K. FOCHSLE DR. RER. NAT. B. HANSEN ARABELLASTRASSE 4. D-8000 MO NCHEN 8D. TELEPHONE (08?) 911087. TELEX 05-29419 (PATHE)

35 761 o / wa

PERSTORP AB, PERSTORP / SWEDEN

Plastic product and process for its manufacture

The invention relates to a plastic product, for example in the form of a door panel, a baseboard, a Shadow bar, a window frame, a door, a flower pot or a wastebasket on which a decorative surface layer is applied.

It is known, for example, door panels, To produce floor moldings and shadow moldings from a thermoplastic such as polyvinyl chloride. These Products are made by extrusion. at

3 U H1

In this economical, continuous process, the strips are in principle obtained in infinitely long lengths and then cut to the desired length.
· Products made in this way have many good properties. However, they also have bad properties, which is why these products are not accepted by many people. In particular, the strips are easily scratched and dust accumulates due to the electrostatic charge on the products. In addition, it has not hitherto been possible to provide such products with a decorative patterned surface.

After all, the products generally cannot be nailed, which is viewed by craftsmen as a major disadvantage will.

According to the invention, these disadvantages can be avoided, by making a product, e.g. in the form of a. Door panel, a baseboard, a shadow bar, a window frame, a door, a flower pot or a paper basket, the product with a decorative Surface layer is provided. The product is characterized in that it is made of a carrier a thermoplastic, on which a decorative surface layer made of wood veneer, metal or a a thermoset-containing layer is firmly applied by means of a hot melt elastomer.

Preferably the carrier is made of a vinyl resin such as

"- 8th -

·% ♦ ♦ »ff t · I · *

·· - ^: · 3HU10

Polyvinyl chloride, polystyrene, acrylic butadiene styrene resin (ABS), polypropylene or polyethylene. However, all other thermoplastics can also be used with the corresponding Qualities are used. 5

In the aforementioned alternative, in which the decorative surface layer is made of a wood veneer exists, it is extremely advantageous if ■ the veneer to achieve water-repellent properties has been surface treated or impregnated.

For this purpose, for example, an acid-hardening resin, a polyurethane resin, a polyester resin can be used Use epoxy resin, nitrocellulose resin, or polyacrylate resin. You can also use pressure-impregnated Use veneer.

The veneer can be cut to suitable lengths or it can be endless.

If the decorative surface layer consists of metal, so the metal is preferably bronze, copper or aluminum. For cost reasons it is advantageous to to use thin foils, but thicker metal layers can also be used according to the invention.

As mentioned, the decorative surface layer can contain a thermosetting resin (thermosetting resin). According to With this alternative it is possible to cover a simple sheet, e.g. a piece of paper or a cloth, with a thermosetting plastic to impregnate.

• «· β *

'"'''" 31.4 H.

According to a further alternative, a thermosetting laminate can be used as a decorative surface layer will. Such laminates are obtained by impregnating two or more with a thermosetting resin Sheets, e.g. those made of paper or cloth, are pressed together under increased pressure and temperature.

Nowadays such laminates can be manufactured continuously. However, it is still common for one the pressing is carried out intermittently in multi-stage pressing, where the material for many laminates at the same time is pressed. Before pressing can take place, separate sheets of paper, among other things, have to be made or cloth impregnated with a thermosetting resin are superposed to form so-called Press packs. This is often done by hand "made.

In the case of continuous pressing, two or more continuous sheets can be made from one thermosetting resin impregnated paper or cloth can be fed into a continuous press. The finished laminate is then received rolled up.

The laminate of the thermosetting resin may conventionally consist of some sheets of so-called Core paper impregnated with a phenol-formaldehyde resin; and one or two laid on top Better quality paper sheets impregnated with, for example, metalim-formaldehyde resin will.

-10 -

- - · ^: · 3UU10

- ίο -

Regardless of whether the decorative surface layer is made from a single sheet, e.g. from a thermosetting Sheets of impregnated paper or fabric, or a thermosetting laminate, is both It is advantageous to use the same kinds of the thermosetting resin in cases.

At least one of the following thermosetting resins is preferably used: melamine-formaldehyde resin, Phenol-formaldehyde resin, urea-formaldehyde resin, Polyester resin, derivatives of these. Resins or analogous resins, such as cresol-formaldehyde resin, or terpolymers, such as Melamine-urea-formaldehyde resin or phenol-urea-formaldehyde resin .

The hot melt elastomer according to the invention the decorative surface layer firmly adhered to the thermoplastic carrier is preferred built up on a copolymer of ethylene-vinyl acetate or of a polyamide or consists of one Polymer made from styrene-butadiene rubber (SBR) .Other Elastomers with similar properties can also be used.

The plastic product according to the invention is produced by adding a decorative surface layer made of wood veneer, metal or a thermoset-containing one Layer that is provided with a layer of a hot melt adhesive on one side, with a carrier from a thermoplastic by means of the elastomer during or immediately after the shaping of the

-11 -

Wearer and while the wearer is still warm.

Then the heat from the wearer is used to make the elastomer to be heated so that it becomes sticky and as a bonding layer between the decorative surface layer and acts on the wearer. Therefore, it is usually not necessary to use extra heat to make the elastomer sticky. This is extremely important for reasons of handling and economy. Reliability is also there very big here.

As a result, the decorative surface layer can be coated on the back with a hot melt adhesive which you then let cool down after use.

The elastomer does not become sufficiently tacky before it is reheated ^{to about 140 to 240 ° C.} The melting temperature within this interval depends on the elastomer used. An elastomer based on an ethylene-vinyl acetate copolymer has a softening point from 140 to 220 ⁰ C, while an elastomer based on a polyamide generally has a softening point from 180 to 260 ⁰ C.

The decorative surface layer coated with the elastomer can be produced in a rational manner at a large manufacturer and can then be sent to other factories are distributed where the finished

-.12 -

• *

■ ··· · ^; · 3HH10

- ■ 12 -

Plastic product is manufactured simultaneously with the manufacture of the thermoplastic carrier. {

If the plastic product according to the invention consists of an elongated article, such as a door, a door panel, a floor molding or a shadow molding, it is extremely advantageous if you ^! continuously producing the thermoplastic carrier by extrusion. A continuous sheet of a decorative surface layer coated on one side with a hot melt elastomer can then be adhered to the extruded carrier while the carrier is still warm from the molding.

The decorative surface layer is then applied to the 'Applied extruded carrier during this the Leaves the mold, but before it enters a normal calibration chamber, where the final shape of the beam is set. will have left.

A particularly preferred method according to the invention consists in placing the elastomer-coated side of the decorative surface layer against the support in the mentioned calibration chamber by means of the overpressure or vacuum normally present there presses.

A considerable advantage of the method according to the invention, in which the carrier is extruded and then covered with a continuous sheet of decorative surface layer

- 13 -

fr *

- 13 -

is combined is that it is generally not necessary to supplement the extruder. In addition, of course, the production is particularly economical.
5

If the carrier is produced by injection molding or compression molding, the advantages according to the invention can be achieved can also be achieved. Among other things, there are many and unique possibilities to give the plastic product a decorative Lending surface makes it possible. For this purpose, one or more parts of a decorative surface material are used Coated with a hot melt elastomer on one side and one side for injection molding or compression molding, the mold used for the thermoplastic carrier is introduced before using the mold the plastic material is filled. Then, when the mold is filled, the parts of the surface layer material adhere firmly on the carrier.

The invention will be more fully understood in connection with 1 and 2 understandably, in which an embodiment according to the invention is shown schematically, in which a thermoplastic carrier is continuous is extruded. The backing is then covered with a continuous sheet of decorative thermoset laminate, the back of which is covered with a hot melt elastomer is coated, united.

Fig. 1 shows how the thermosetting laminate is coated with a hot melt elastomer

and is united with the thermoplastic carrier.

- 14 -

3HU10

Fig. 2 shows how a thermosetting laminate, which has already been coated with a hot melt elastomer, is combined with a thermoplastic carrier.
5

In FIG. 1, a carrier 7, for example made of polyvinyl chloride, is extruded by means of an extruder 1. A thermoset laminate 4 in the form of a roll is provided on the rear side with a hot melt elastomer in a coating device 6. The elastomer can for example be composed of a copolymer of ethylene-vinyl acetate, with a softening point of about 180 to 210 ^° C. The laminate can consist, for example, of three paper sheets that are impregnated with a melamine-formaldehyde resin and that are in a continuous press have been laminated.

The laminate 4 coated with the elastomer is guided to a conventional calibration chamber 2 via guide rollers 5. The calibration chamber 2 is normally only used to precisely adjust the final shape of the carrier. According to the invention, the side of the laminate coated with the elastomer is brought together with the carrier in the calibration chamber 2, in the present case at a temperature of 160 to 190 ^° C. The temperature of the carrier is sufficient to make the elastomer tacky.

The bonding of the laminate to the carrier is achieved by the overpressure or vacuum in the calibration chamber 2 relieved.

-. 15 -

/ · ".:. 314Η10

- 15 -

After the laminate 4 and the carrier 7 in the calibration chamber 2 have been combined to form the desired plastic product, the product is then used in a subsequent Cooler 3, which is generally a water cooler, is cooled. Then the product comes on cut the desired length; this is not shown in the figure.

The reference numbers in Fig. 2 relate to the same details as in Fig. 1. As mentioned, the heat-hardened laminate 4 is already on the back provided with a hot melt elastomer. Therefore, in this modified procedure, there is none Coating device 6 is provided. Otherwise it runs the method according to FIG. 2 completely as in FIG. 1.

Blank page

Claims (14)

PATENT LAWYERS DR. ING. E. HOFFMANN (1930-W6). DIPL.-ING. W. EITLE. OR.RER. NAT. KiHOFFMANN DIPl.-ING.W. LEHN DIPL.-ING. K. FDCHSLE DR. RER. NAT. B. HANSEN ARABELLASTRASSE 4 ■ D-8000 MO NCHEN 81 · TELEPHONE (08?) 911087 · TELEX 05-2761? (PATHE) 35 761 o / wa PERSTORP ABf PERSTORP / SWEDEN Plastic product and process for its manufacture PATENT CLAIMS 1. Plastic product, for example in the form of a door trim, floor molding, shadow molding, a Window frame, a door, a flower pot or a waste paper basket, whereby the product is a having a decorative surface layer, characterized in that the product contains a carrier (7) made of a thermoplastic, on which a decorative surface layer (4) made of wood veneer, metal or a layer containing a thermoset firmly adhered by a hot melt elastomer. 2. 'Plastic product according to claim 1, characterized characterized in that the carrier (7) is made of a vinyl plastic, such as polyvinyl chloride, Polystyrene, acrylic butadiene styrene polymer (ABS), Polypropylene or polyethylene is made. 5 3. Plastic product according to claims 1 or 2, characterized in 'that the decorative surface layer (4) consists of a surface-treated or impregnated wood veneer. 4. Plastic product according to claims 1 or 2, characterized characterized in that the decorative surface layer (4) made of bronze, copper or Made of aluminum. 5. Plastic product according to claim 4, characterized in that the decorative Surface layer (4) made of bronze, copper or aluminum is present in the form of a thin film. 6. Plastic product according to claims 1 or 2, ^ characterized in that the decorative Surface layer made of a single sheet, for example paper or fabric, covered with a thermoset is impregnated, consists. 7. Plastic product according to claims 1 or 2, characterized in that the decorative surface layer consists of a thermoset laminate. 8. Plastic product according to one of claims 6 or 7, 31 k 1 41 characterized in that the decorative surface layer of at least one thermoset from the melamine-formaldehyde resin group, Phenol-formaldehyde resin, urea-formaldehyde resin, polyester resin, a derivative of one of the named resins, an analogous resin, such as a cresol-formaldehyde resin, or a terpolymer, such as a melamine-urea-formaldehyde resin or a phenol-urea-formaldehyde resin, contains. 9. Plastic product according to one of claims 1 to 8, characterized in that the Hot melt elastomer is preferably built up on an ethylene-vinyl acetate copolymer or on a polyamide or that it consists of a polymer made of styrene-butadiene rubber (SBR). 10. A method for producing a resin product according to any one of claims 1 to 9, characterized in that a decorative Surface layer (4) made of wood veneer, metal or a thermoset-containing layer that is on a Side is equipped with a layer of a hot melt elastomer, with a carrier thermoplastic by means of the elastomer during or immediately after the shaping of the carrier and when the carrier is still is warm, connected. 11. The method according to claim 10, wherein the plastic product consists of an elongate article, such as a Door, a door panel, a baseboard or a shadow bar, there is, characterized in that the thermoplastic carrier is produced continuously by extrusion and that a continuous sheet from a decorative surface layer, which is provided on one side with a hot melt elastomer, the elastomer-coated side is glued to the extruded carrier, while the wearer is still warm after shaping. 12. The method according to claim 11, characterized in that the elastomer-coated Side of the decorative surface layer is applied to the extruded carrier after "But the wearer has left the mold before he enters a standard calibration chamber in which the shape of the wearer is precisely adjusted, has left. 13. The method according to claim 12, characterized in that the elastomer-coated Side of the decorative surface layer against the carrier in a conventional calibration chamber is pressed by means of an overpressure or vacuum existing there. 14. The method according to claim 10, characterized in that g e k e η η, that one in one for injection molding or compression molding of the thermoplastic Carrier used before filling the Plastic material one or more pieces of a decorative surface layer material, which on one side is provided with a hot melt elastomer, introduces, the parts of the surface layer material be firmly connected to the carrier that is formed when the mold is filled.