Method for manufacturing paper container and paper container

Abstract

The invention discloses a method for manufacturing a paper container and the paper container. The manufacturing method comprises the steps of printing, laminating and heat sealing, and comprises the following specific steps of: printing a paper substrate, wherein the paper substrate comprises at least one pair of jointing edges, and at least one of the pair of the jointing edges is provided with one or more grooves; in the paper substrate, paving and laminating a waterproof thermally-bonded film on at least one side with the groove; and under the heating condition, making the waterproof thermally-bonded film generate viscosity, and bonding the jointing edge with the groove and the corresponding jointing edge under increased pressure subsequently. The paper container comprises a body part and a bottom plate positioned at the bottom end of the body part. The manufacturing method can slow down the degree of temperature reduction of the waterproof thermally-bonded film during the heat sealing, additionally provides an unsmooth surface required by increasing bond strength, achieves the prospective bond strength, and reduces overall time required by the heat sealing step; and the paper container has the advantages of high manufacturing speed and high bond strength.

Description

technical field [0001] The invention relates to a manufacturing method of a paper container and a paper container. Background technique [0002] Generally, in a paper container, such as a paper cup, an inner film is formed on the inner surface of the cup body. Preferably, the inner film is a film formed of a thermoplastic material (such as polyethylene), so as to prevent liquid from leaking. It is used as an adhesive for heat sealing, so that the two edges of the cup body are bonded to each other. [0003] The heat-sealing process of conventional paper containers is mainly to heat the paper substrate with polyethylene film to make the polyethylene film sticky, and then press and heat seal the two opposite edges of the paper substrate. [0004] However, a common problem in the conventional heat-sealing process is that when the polyethylene film is heated, it should achieve the expected viscosity, but when the pressing step is performed, the polyethylene film at high temperat...

AI Technical Summary

Problems solved by technology

[0004] However, a common problem in the conventional heat-sealing process is that when the polyethylene film is heated, it should achieve the expected viscosity, but when the pressing step is performed, the polyethylene film at high temperature is still gradually cooling, causing its The stickiness is not as expected. In order to make the two opposite edges of the paper substrate tightly bonded to each other, the pressing time has to be prolonged, otherwise there will be insufficient bonding strength and it is easy to cause liquid leakage during use

[0005] For manufacturers of disposable paper containers that emphasize mass production and low manufacturing costs, the traditional heat-sealing process cannot reduce the time spent due to the pressing step, which cannot meet the needs of manufacturers

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