Roller coating method used in polyolefin thermoplastic elastomer products

Abstract

The invention discloses a roller coating technology method used in polyolefin thermoplastic elastomer products. The method comprises the steps that firstly, TPO materials with PP foam are conveyed to the position between a transmission steel roller and a first steel roller, and the PP foam face faces the first steel roller and a second steel roller; then, the distance between the first steel roller and the second steel roller is adjusted according to the hot melt adhesive coating thickness, infrared heating devices are arranged in the first steel roller and the second steel roller, a solid hot melt adhesive is melted through a double-roller open mill, the hot melt adhesive flows into the part between the heated first steel roller and the heated second steel roller, and the surface of the PP foam is coated with the melted hot melt adhesive; and finally, finished TPO products subjected to roller coating are automatically conveyed out through the transmission steel roller. A traditional solvent type adhesive spraying technology is replaced with the roller coating technology, the procedure of printing PU back paint on the TPO back face is omitted, the procedure of spraying of a PP framework adhesive is omitted, and automobile VOC is reduced; and the health of producers is protected, the air pollution is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to the production field of automobile accessory materials, in particular to a roll coating method used in polyolefin thermoplastic elastomer products. Background technique [0002] In the design of high-end automotive interiors, a layer of polyolefin thermoplastic elastomer (TPO) sheet is usually attached to the polypropylene (PP) plastic door panel or instrument panel frame, and the TPO sheet and PP foam are heat-pressed together, and at the same time Transfer the pattern of the hot pressing roller to the surface of TPO, the composite plastic door panel or instrument panel parts with PP sponge TPO skin has a soft feel, various pattern effects, and can provide a variety of automotive interior designs by adjusting the type of TPO toner method to meet customers' needs for automotive interiors. [0003] Usually, after spraying polyurethane adhesive on the PP door panel or instrument panel skeleton, place the skeleton with microporos...

AI Technical Summary

Problems solved by technology

At the same time, apply a layer of PU back paint on the PP foam on the back of the TPO skin in advance to increase the surface tension of the PP foam, and at the same time serve as a binder for the PP foam and PU glue, and in the production process, it is necessary to use a spray gun Spray PU adhesive on the skeleton one by one, low efficiency

[0004] Therefore, the traditional process of spraying solvent-based adhesives for the production of polyolefin thermoplastic elastomer products has the following defects: 1. Organic solvents have a strong odor, are flammable, volatile, pollute the air, and are toxic to users. At the same time, PU with organic components Adhesives will increase the organic volatiles in the car; 2. The bonding function of PU adhesives is based on the principle of chemical curing, the effective use period is relatively short, and the storage conditions after opening are high. If the expiration date is exceeded, the glue will become cloudy and lose its activity. 3. Printing the PU back paint on the PP foam behind the TPO skin increases the process and increases the cost; 4. It needs to increase the spraying PU adhesive process, which is inefficient and not suitable for rapid automated production

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