Composite Thermoformed Tableware and Preparation Method Thereof

Abstract

A composite thermoformed tableware and preparation method thereof. The preparation method involves a preheating step, a compositing step and a thermoforming step in sequence; the preheating step heats multilayer forming materials at a temperature of 35° C. to 150° C., the forming materials have one or at least two of paper, plastic and inorganic layer; the compositing step involves stacking the preheated forming materials to form a composite material; the thermoforming step involves heat-pressing the composite material at a temperature of 80° C. to 150° C. and a pressure of 0.05 MPa to 0.5 MPa to form a three-dimensional body. The tableware is thermoformed by multiple layers of the same material or different materials, so that the thickness and strength of the tableware are higher.

Description

Claims

1. A preparation method of composite thermoformed tableware, characterized in that the preparation method comprises a preheating step, a compositing step and a thermoforming step in sequence; the preheating step comprises heating multilayer forming materials at a temperature of 35° C. to 150° C.; the forming materials comprise one or at least two kinds of materials from paper, plastic and inorganic layer;the compositing step comprises stacking the preheated forming materials to form a composite material; andthe thermoforming step comprises heat-pressing the composite material at a temperature of 80° C. to 150° C. and a pressure of 0.05 MPa to 0.5 MPa to form a three-dimensional body.

2. The preparation method of composite thermoformed tableware according to claim 1, wherein the forming material is self-adhesive, and the forming material is in a half molten state in the preheating step to be bonded with another forming material.

3. The preparation method of composite thermoformed tableware according to claim 1, wherein in the preheating step, an adhesive is coated between two adjacent forming materials; the adhesive comprises by mass 20% to 50% homopolyacrylate and 50% to 80% silica pigment, or the adhesive comprises by mass 50% to 95% PVA and 5% to 50% starch; the coating weight of the adhesive is 3 g/m2 to 15 g/m2.

4. The preparation method of composite thermoformed tableware according to claim 1, wherein after the thermoforming step, a grease proof layer is coated on the surfaces of the three-dimensional body, and the grease proof layer comprises by mass 1% to 50% starch, 50% to 98% polyacrylate emulsion and 1% to 3% alkyl ketene dimer emulsion, and the coating weight of the grease proof layer is 0.1 g/m2 to 2 g/m2.

5. The preparation method of composite thermoformed tableware according claim 1, further comprising a drying step, which is carried out between the compositing step and the thermoforming step, and wherein the drying step comprises drying the composite material at a drying temperature of 100° C. to 200° C.

6. The preparation method of composite thermoformed tableware according to claim 1, wherein the composite thickness of the three-dimensional body is 100 µm to 10 mm, the bending resistance force of the three-dimensional body is 0.9 kgf to 2.0 kgf, and the plybond strength of the three-dimensional body is greater than 120 J/m2.

7. The preparation method of composite thermoformed tableware according to claim 1, wherein the preparation method is carried out by a compositing machine, which comprises a transferring mechanism, a preheating zone, a compositing zone and a thermoforming zone; the transferring mechanism comprises at least two unwinding devices, the preheating zone comprises at least two heating rollers, the compositing zone comprises a plurality of pressing rollers, and the thermoforming zone comprises a molding device; the forming materials are transferred to the preheating zone by the unwinding devices, the heating rollers heat the forming materials, the pressing rollers combine the multilayer forming materials, and the molding device carries out thermoforming on the composite material.

8. Composite thermoformed tableware, prepared by the preparation method according to claim 1;wherein the tableware comprises at least two layers of forming materials, which are stacked to form a composite structure, and the forming materials comprise one or at least two kinds of materials from paper, plastic and inorganic material.

9. The composite thermoformed tableware according to claim 8, wherein an adhesive is disposed between two adjacent layers of the forming materials, the adhesive comprises by mass 20% to 50% homopolyacrylate and 50% to 80% silica pigment, or the adhesive comprises by mass 50% to 95% PVA and 5% to 50% starch, and the coating weight of the adhesive is 3 g/m2 to 15 g/m2; a grease proof layer is coated on the surfaces of the tableware, the grease proof layer comprises by mass 1% to 50% starch, 50% to 98% polyacrylate emulsion and 1% to 3% alkyl ketene dimer emulsion, and the coating weight of the grease proof layer is 0.1 g/m2 to 2 g/m2.

10. The composite thermoformed tableware according to claim 8, wherein the tableware comprises a handle and a main part, the handle and the main part are integrally formed and connected, and an inner arc is formed at the corner between the handle and the main part.