Three-time injection molding inner and outer double-layer integrated heat-insulating lunch box and processing method thereof

Abstract

The invention discloses a three-time injection-molded inner and outer double-layer integrated heat-insulating lunch box and a processing method thereof, comprising an inner box body and an outer box body, wherein the inner box body is provided with side convex blocks, the side convex blocks are provided with upper connecting ribs and side connecting ribs, the outer box body is provided on the outer wall of the inner box body, a cavity is formed between the outer box body and the inner box body, the outer wall of the upper opening of the outer box body is provided with an outer groove, the upper ends of the inner and outer box bodies are provided with mouth edging, the mouth edging comprises an upper boss and a side boss, the upper boss is provided with an upper groove, the side boss is provided with an inner groove and a lower clamping rib, the head of the lower clamping rib is clamped into the outer groove, and the processing method comprises the following steps: 1. Processing the inner box body: using a first injection mold to obtain an inner box body through injection molding; 2. Processing the outer box body: using a second injection mold to obtain an outer box body through injection molding; 3. Edge sealing of the inner and outer box bodies: using a third injection mold to cover the outer box body on the outside of the inner box body, and then putting them into the third injection mold together, so that the upper openings of the inner and outer box bodies are injection molded to obtain mouth edging.

Description

Technical Field

[0001] The invention relates to a heat-insulating lunch box, in particular to a triple injection-molded inner and outer double-layer integrated heat-insulating lunch box and a processing method thereof. Background Art

[0002] Traditional insulated lunch boxes, fresh-keeping boxes, etc. are usually single-layer structures with poor heat preservation ability and fast heat dissipation. Therefore, people have invented double-layer insulated lunch boxes and fresh-keeping boxes, which include an inner liner and an outer shell, and a cavity is formed between the inner liner and the outer shell, which can reduce the heat dissipation and improve the heat preservation effect. However, the existing double-layer insulated lunch boxes are all made by secondary injection molding, that is, the inner liner is first injection molded by a first mold, and then the outer shell is injection molded by a second mold, and finally the flanged lower end of the inner liner and the upper mouth of the outer shell are welded and connected by spin welding. However, this processing method can only be applied to the processing of circular insulated lunch boxes, and cannot be applied to the processing of rectangular, elliptical, and polygonal insulated lunch boxes. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a three-time injection molding inner and outer double-layer integrated insulation lunch box with good heat preservation and freshness preservation performance, convenient processing, and suitable for processing insulation lunch boxes of different shapes and a processing method thereof.

[0004] The technical scheme of the three-time injection molding inner and outer double-layer integrated heat-insulating lunch box and the processing method thereof is as follows: it comprises an inner box body and an outer box body, a side protrusion is formed on the outer wall of the upper opening of the inner box body, an upper connecting rib and a side connecting rib are formed on the side protrusion, an outer box body is arranged on the outer wall of the inner box body, an upper end of the outer box body matches with the lower end of the upper connecting rib, an upper inner wall of the outer box body matches with the outer wall of the side protrusion, a cavity is formed between the outer box body and the inner box body, an outer groove is formed on the outer wall of the upper opening of the outer box body, an opening edge is arranged at the upper ends of the inner box body and the outer box body, the opening edge comprises an upper boss and a side boss, an upper groove is formed under the upper boss, the upper groove matches with the outer wall of the upper connecting rib, an inner groove is formed on the inner wall of the side boss, the inner groove matches with the outer wall of the side connecting rib, a lower clamping rib is formed on the side boss below the inner groove, and the head of the lower clamping rib is clamped in the outer groove, and the processing method has the following steps:

[0005] ①. Processing the inner box body: using the first injection mold, injection molding the inner box body;

[0006] ②. Processing the outer box body: using the second injection mold to obtain the outer box body through injection molding;

[0007] ③. Edge sealing of inner and outer box bodies: Use the third injection mold to put the outer box body onto the outside of the inner box body, and then put the inner and outer box bodies together as inserts into the third injection mold to make the upper openings of the inner and outer box bodies be injection molded to obtain edge sealing.

[0008] The invention discloses a three-time injection molding inner and outer double-layer integrated heat-insulating lunch box and a processing method thereof. First, a plastic inner box body is injection molded by using a first injection mold, a side convex block is formed at the upper opening of the inner box body, and an upper connecting rib and a side connecting rib are formed on the side convex block. Then, a plastic outer box body is injection molded by using a second injection mold, and an outer groove is formed on the outer wall of the upper opening of the outer box body. Then, the outer box body is sleeved onto the outside of the inner box body, wherein the inner wall of the upper opening of the outer box body is tightly matched with the outer wall of the side convex block of the inner box body, and the upper end surface of the outer box body is in sealing contact with the lower end of the side connecting rib of the inner box body, so that a cavity is formed between the inner and outer box bodies. At this time, the assembled inner and outer box bodies are put into the third injection mold together as an insert. In the plastic mold, a third injection molding is carried out, and a layer of mouth edging is coated on the upper ends of the inner and outer box bodies. An upper boss and a side boss are formed on the mouth edging, an upper groove is formed under the upper boss, the upper groove wraps the upper connecting rib, an inner groove is formed on the inner wall of the side boss, the inner groove wraps the side connecting rib, and a lower clamping rib is formed under the side boss. The lower clamping rib cooperates with the outer groove of the outer wall of the upper mouth of the outer box body, so that the upper mouths of the inner and outer box bodies are sealed and tightly matched (that is, the injection molding mouth edging connects the inner and outer box bodies into one body), no rotation welding connection is required, the manufacturing is convenient, the assembly is more reliable, and it is suitable for processing thermal insulation lunch boxes of different shapes. The inner and outer double layers plus the hollow structure effectively improve the thermal insulation performance of the thermal insulation lunch box.

[0009] The invention discloses a three-time injection molding inner and outer double-layer integrated heat preservation lunch box and a processing method thereof, wherein the mouth edge is provided with a convex rib at the lower end of the side connecting rib, thereby improving the structural strength of the mouth edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic structural diagram of the three-time injection molding inner and outer double-layer integrated heat-insulating lunch box of the present invention;

[0011] Figure 2 yes Figure 1 A local enlarged schematic diagram of point A. DETAILED DESCRIPTION

[0012] The present invention relates to a three-time injection molding inner and outer double-layer integrated heat-insulating lunch box and a processing method thereof. Figure 1 — Figure 2As shown, it comprises an inner box body 1 and an outer box body 2, a side protrusion 11 is formed on the outer wall of the upper opening of the inner box body, an upper connecting rib 12 and a side connecting rib 13 are formed on the side protrusion, the outer box body 2 is arranged on the outer wall of the inner box body 1, the upper end of the outer box body matches with the lower end of the upper connecting rib 12, the upper inner wall of the outer box body matches with the outer wall of the side protrusion 11, a cavity 3 is formed between the outer box body 2 and the inner box body 1, an outer groove 21 is formed on the outer wall of the upper opening of the outer box body 2, and an outer groove 22 is formed on the inner wall of the outer box body 2. The upper ends of the box body 1 and the outer box body 2 are provided with a mouth edging 4, and the mouth edging includes an upper boss 41 and a side boss 42. An upper groove 43 is formed under the upper boss, and the upper groove matches the outer wall of the upper connecting rib 12. An inner groove 44 is formed on the inner wall of the side boss, and the inner groove matches the outer wall of the side connecting rib 13. The side boss 42 is located below the inner groove 44 and is provided with a lower clamping rib 45. The head of the lower clamping rib is clamped into the outer groove 21. The steps of the processing method are as follows:

[0013] ① Processing the inner box body: using the first injection mold, injection molding to obtain the inner box body 1;

[0014] ②, processing the outer box body: using the second injection mold, injection molding to obtain the outer box body 2;

[0015] ③. Edge sealing of inner and outer box bodies: Use the third injection mold to put the outer box body 2 onto the outside of the inner box body 1, and then put the inner and outer box bodies into the third injection mold as inserts, so that the upper openings of the inner and outer box bodies are injection molded to obtain the mouth edge 4.

[0016] The present invention discloses a three-time injection-molded inner and outer double-layer integrated heat-insulating lunch box and a processing method thereof. First, a plastic inner box body 1 is injection-molded by using a first injection mold, a side protrusion 11 is formed on the upper opening of the inner box body, and an upper connecting rib 12 and a side connecting rib 13 are formed on the side protrusion. Then, a plastic outer box body 2 is injection-molded by using a second injection mold, and an outer groove 21 is formed on the outer wall of the upper opening of the outer box body. Then, the outer box body is sleeved onto the outside of the inner box body, wherein the upper inner wall of the outer box body is tightly matched with the outer wall of the side protrusion 11 of the inner box body, and the upper end surface of the outer box body is in sealing contact with the lower end of the side connecting rib 13 of the inner box body, so that a cavity 3 is formed between the inner and outer box bodies. At this time, the assembled inner and outer box bodies are put into the third injection mold together as inserts. In the tool, a third injection molding is performed, and a layer of mouth edging 4 is coated on the upper ends of the inner and outer box bodies. The mouth edging is formed with an upper boss 41 and a side boss 42, and an upper groove 43 is formed under the upper boss. The upper groove encloses the upper connecting rib 12, and the inner wall of the side boss is formed with an inner groove 44, and the inner groove encloses the side connecting rib 13. A lower clamping rib 45 is formed below the side boss, and the lower clamping rib cooperates with the outer groove 21 of the outer wall of the upper mouth of the outer box body 2, so that the upper mouth of the inner and outer box bodies are sealed and tightly matched (that is, the injection molding mouth edging 4 connects the inner and outer box bodies into one body), and no rotation welding connection is required, which is convenient to manufacture and more reliable to assemble. It is suitable for processing heat preservation lunch boxes of different shapes, and the inner and outer double layers plus hollow structure effectively improve the heat preservation performance of the heat preservation lunch box. The mouth edging 4 is formed with a convex rib 46 at the lower end of the side connecting rib 13. With the convex rib, the structural strength of the mouth edging 4 is improved.

Claims

1. A method for manufacturing a three-step injection molding inner and outer double-layer integrated heat-insulating lunch box, characterized in that: The invention comprises an inner box body (1) and an outer box body (2), wherein a side protrusion (11) is formed on the outer wall of the upper opening of the inner box body, an upper connecting rib (12) and a side connecting rib (13) are formed on the side protrusion, the outer box body (2) is arranged on the outer wall of the inner box body (1), the upper end of the outer box body matches with the lower end of the upper connecting rib (12), the upper inner wall of the outer box body matches with the outer wall of the side protrusion (11), a cavity (3) is formed between the outer box body (2) and the inner box body (1), the upper outer wall of the outer box body (2) is formed with an outer groove (21), and the inner The upper ends of the box body (1) and the outer box body (2) are provided with a mouth edging (4), the mouth edging comprising an upper boss (41) and a side boss (42), an upper groove (43) is formed below the upper boss, the upper groove matches the outer wall of the upper connecting rib (12), an inner groove (44) is formed on the inner wall of the side boss, the inner groove matches the outer wall of the side connecting rib (13), a lower clamping rib (45) is formed below the side boss (42) and the head of the lower clamping rib is clamped into the outer groove (21), and the processing method comprises the following steps: ①, processing the inner box body: using the first injection mold, injection molding to obtain the inner box body (1), the upper opening of the inner box body is formed with a side protrusion (11), and the side protrusion is formed with an upper connecting rib (12) and a side connecting rib (13); ②, processing the outer box body: using the second injection mold, injection molding to obtain the outer box body (2), and forming an outer groove (21) on the outer wall of the upper opening of the outer box body; ③. Edge sealing of the inner box body and the outer box body: The third injection mold is used to cover the outer box body (2) onto the outside of the inner box body (1), wherein the inner wall of the upper opening of the outer box body is tightly and sealedly matched with the outer wall of the side protrusion (11) of the inner box body, and the upper end surface of the outer box body is in sealing contact with the lower end of the side connecting rib (13) of the inner box body, so that a cavity (3) is formed between the inner and outer box bodies, and then the inner and outer box bodies are placed together as inserts in the third injection mold, and the upper openings of the inner and outer box bodies are injection molded to obtain the edge wrapping (4), and the injection molding edge wrapping (4) seals the inner box body (1) and the outer box body. (2) are connected as one body, an upper boss (41) and a side boss (42) are formed on the mouth edging, an upper groove (43) is formed below the upper boss, the upper groove wraps around the upper connecting rib (12), an inner groove (44) is formed on the inner wall of the side boss, the inner groove wraps around the side connecting rib (13), a lower clamping rib (45) is formed below the side boss, the lower clamping rib cooperates with the outer groove (21) of the outer wall of the upper mouth of the outer box body (2), so that the upper mouth of the inner and outer box bodies are tightly sealed, and the mouth edging (4) is formed with a convex rib (46) at the lower end of the side connecting rib (13).

Images