At present, plastic cutlery boxes are mainly simple lunch boxes and durable lunch boxes. The simple lunch boxes are generally discarded after being used once or several times. Therefore, in consideration of cost, the wall thickness is generally very thin. This kind of simple plastic lunch boxes mainly include boxes Body and lid, today we will learn about the manufacturing method of the sealing structure of the square plastic lunch box.
1. The principle and purpose of making square plastic cutlery boxes
The utility model relates to a sealing structure of a square plastic lunch box, comprising a box body and a box cover. The utility model is characterized in that the upper edge of the box body is set in an inverted trapezoidal structure and the edge of the box cover is also provided with a circle of inverted trapezoidal recesses. The two side walls of the recessed part are respectively formed with an outer buckle part and an inner buckle part. There is a gap between the outer buckle part and the outer side of the inverted trapezoidal structure. The inner buckle part and the inverted trapezoidal structure have an interference fit on the inner side. The internal interference sealing structure is also suitable for placing soup foods, which has a good sealing effect, will not be stuck when opened, and is convenient to open. Its purpose is to provide a sealing structure for a square plastic lunch box. The upper edge of the box body is provided with an inverted trapezoidal structure. The edge of the box cover is also provided with a circle of inverted trapezoidal recesses. Along the fit, due to the internal interference sealing structure, it has a good sealing effect. It will not be jammed when opening and it is difficult to open the lid. It is also suitable for placing soup food.

Second, the manufacturing method of the sealing structure of the square plastic tableware box
The inner side of the edge of the box cover is provided with a rib that cooperates with the edge of the box body, and the box body and the box cover are buckled by the way of clamping the rib and the edge of the box body. This kind of snap-fit ​​buckle method is applied to square plastic When the lunch box is opened, one side of the box cover is lifted. At this time, the deformation of the box cover causes the other sides to shrink inward, so that the clip is tightly buckled with the edge of the box body and cannot be opened easily. The wall thickness of the box is very thin, and it is easy to cause the lid to be damaged when opened. At the same time, the simple lunch box of this structure is not suitable for storing soup foods. In addition, consumers will touch their lips when using this structure. Scratches the lips easily.
1. The sealing structure of a square plastic lunch box, including a box body and a box cover, is characterized in that the upper edge of the box body is set in an inverted trapezoidal structure and the edge of the box cover is also provided with a circle of inverted trapezoidal recesses. The two side walls of the part respectively form an outer buckle part and an inner buckle part, a gap is left between the outer buckle part and the outer side of the inverted trapezoidal structure, and the inner buckle part and the inner side of the inverted trapezoidal structure have an interference fit.
2. When the new type of box cover is matched with the box body, the inner buckle is squeezed and the mating surface is pressed tightly; the box cover and the outer buckle of the square box deform at the same time, and the gap between the outer buckle and the outside of the flap disappears, and the mating surface Fit to achieve a double sealing effect. In addition, the upper edge of the square box is set in an inverted trapezoid shape, so that the edge extends downward and away from the mouth of the box. It is not easy for consumers to touch their lips during use to avoid scratches. The utility model overcomes the current situation. The simple lunch box has the defects of poor sealing, inconvenient opening, and easy breakage.

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