LID FOR A DISPOSABLE CUP

Abstract

The utility model relates to means for closing drinking vessels, and more particularly to lids for disposable cups for hot and cold beverages. The technical result consists in devising a lid for a disposable cup that is simple to produce and can be used for the closure of hot and cold beverages, based on virgin and/or recycled (obtained from polyethylene terephthalate waste) polyethylene terephthalate foam. The essence of the utility model is that the lid for a disposable cup consists of a body with a rim for fastening to the lip of the cup, and an opening for the liquid supply, said lid being made of polyethylene terephthalate foam with a density from 100 kg/m.sup.3 to 900 kg/m.sup.3 and an inherent viscosity from 0.5 dL/g to 1.0 dL/g.

Claims

1. A lid for a disposable cup, comprising of a body with a rim for fastening to a lip of the cup and an opening for a liquid supply, characterized in that the lid is made of a foamed polyethylene terephthalate with a density from 100 kg/m.sup.3 to 900 kg/m.sup.3, with an intrinsic viscosity of 0.5 dl/g to 1.0 dl/g.

2. The lid according to claim 1, characterized in that the opening for the fluid supply is made in a form of a notch.

3. The lid according to claim 1, characterized in that a thickness of the foamed polyethylene terephthalate is in a range from 100 μm to 1000 μm.

4. The lid according to claim 1, characterized in that a foamed recycled polyethylene terephthalate is a foamed polyethylene terephthalate.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0006] The utility model is illustrated graphically, where:

[0007] FIG. 1 schematically depicts a process for manufacturing a lid for a disposable cup based on foamed polyethylene terephthalate;

[0008] FIG. 2 shows the structure of foamed polyethylene terephthalate;

[0009] FIG. 3 shows one of the options for a lid for a disposable cup.

DETAILED DESCRIPTION OF THE PREDERRED EMBODIMENT

[0010] The lid for a disposable cup consists of a body 1, a rim 2 for fastening the lid to the lip of the cup, and an opening 3 for fluid supply. The opening 3 is cut through. Moreover, the lid for the disposable cup is made of foamed polyethylene terephthalate 4, which retains sufficient strength to withstand the load and ensure the necessary tightness on the lip of the cup. The lid for the disposable cup is made of foamed polyethylene terephthalate 4 with a density ranging from 100 kg/m.sup.3 to 900 kg/m.sup.3, with an intrinsic viscosity (IV) of a layer of foamed polyethylene terephthalate 4 ranging from 0.5 dl/g (deciliters/grams) to 1.0 dl/g. The thickness of the foamed polyethylene terephthalate 4 is chosen in the range from 100 μm to 1000 μm. As foamed polyethylene terephthalate 4, a foamed recycled polyethylene terephthalate can be used. Foamed recycled polyethylene terephthalate is obtained from PET waste after several stages of processing: washing, cleaning of PET waste; crushing, separation by types of polymers and colors; extrusion of polyethylene terephthalate melt; polycondensation of polyethylene terephthalate in the liquid phase. The polycondensation of polyethylene terephthalate in the liquid phase is based on the inherent ability of PET to condense in the molten phase under vacuum conditions. This condensation leads to an increase in the intrinsic viscosity. The high-efficiency vacuum environment effectively removes harmful chemical contaminants from the material, making it possible to use recycled material for 100% safe contact with food. As the molten PET flows into the vertical portion of the P: REACT (LSP reactor), strands are formed to form a corresponding surface in volume. The material is then collected in a horizontal drum and slowly moved forward. The condensation process begins immediately after the formation of the strands and continues until the PET leaves the LSP reactor. The increase in the intrinsic viscosity is controlled by the residence time of the molten PET in the LSP reactor and the degree of vacuum, and therefore can be set to a desired level. Parameter settings allow the control unit to maintain a predetermined IV level within a narrow tolerance range. The process of removing impurities is very efficient as it is carried out in the liquid phase of PET. Not only does the material purity exceeds the limits being set by food industry standards, it also effectively removes lubricants from the strands during the cleaning process. The increase in intrinsic viscosity is measured at about 0.01 dl/g per minute. The continuous operation of the LSP reactor provides a narrow IV range of the granulate which is suitable for high-end applications such as fiber spinning or extrusion sheet. Fluctuations in intrinsic viscosity during mass production are simply ruled out. The separation of contaminants such as lubricants or substances not intended for contact with food is carried out under the action of a highly effective vacuum conditions. The high removal rate of impurities allows the LSP reactor to operate in a variety of applications, providing high operational flexibility. The favorable conditions created in the machine, which is an LSP reactor (including temperature/surface-to-volume ratio/high-efficiency vacuum), allows the PET condensation process to initiate freely. This results in an increase in intrinsic viscosity of about 0.01 dl/g per minute. Faster response times translate into faster results and higher profitability.

[0011] The method for producing a lid for a disposable cup is as follows. From the pellets of polyethylene terephthalate during extrusion by the method of physical foaming with nitrogen and/or carbon dioxide gases or their mixture, rolls of foamed polyethylene terephthalate films are obtained. Next, rolls of foamed polyethylene terephthalate 4 are installed on the unwinding unit of the thermoforming machine. At the next stage, in a thermoforming machine, the material is heated to the softening temperature, and then the lids are molded preferably by the method of pneumatic vacuum thermoforming, at the next stage, a notch or a punching of the opening 3 is made, then the lids themselves are cut out of foamed polyethylene terephthalate 4 and stacked for subsequent stacking in boxes. The claimed utility model is used as follows. The lid is put on the disposable cup with a hot or cold drink in any way (automatic, manual, combined).

INDUSTRIAL APPLICABILITY

[0012] The claimed utility model allows the production of a lid for a disposable cup, including the main carrier layer of foamed polyethylene terephthalate and 100% recycling of the used packaging based on the material with the main carrier layer of foamed polyethylene terephthalate, by crushing, followed by polycondensation of polyethylene terephthalate in the liquid phase, restoring the properties of polyethylene terephthalate to primary raw materials. The claimed utility model allows for an unlimited number of recycling of the lids for the disposable cups with the main carrier layer of foamed polyethylene terephthalate. The claimed utility model allows to create lids for disposable cups made of foamed polyethylene terephthalate with physical and mechanical characteristics better than similar lids for disposable cups based on polystyrene and/or polypropylene, cardboard and/or paper. The claimed utility model does not emit harmful substances in contact with hot liquids in comparison with polystyrene, does not change its physical and mechanical properties when exposed to hot liquids in comparison with polypropylene, and it is cheaper in cost, depending on the required foaming coefficient and depending on the intrinsic viscosity of polyethylene terephthalate. Thus, the claimed utility model improves the performance characteristics of the product.