Manufacturing method of decal container

Abstract

A manufacturing method of a decal container comprises the following steps: carrying out plastic uptake processing on first decal paper to obtain a first molding part with the contour shape of a container body, and then cutting and taking out the first molding part to obtain a first decal paper blank with a pattern; then the first stained paper blank is moved into a mold of an injection molding machine, hot melt plastic is injected into the mold, the hot melt plastic is solidified and connected to the surface, with the patterns, of the first stained paper blank, and the decal container is manufactured. According to the manufacturing method, the pattern of the manufactured decal container can be protected by a layer of transparent adhesive film, so that the pattern cannot be damaged by friction and cannot be discolored or oxidized due to contact with food or air, and the color brightness of the pattern can be kept for a longer time.

Description

Technical Field

[0001] The invention relates to a method for manufacturing a hot-melt plastic container, in particular to a method for manufacturing a hot-melt plastic container with decals. Background Art

[0002] At present, when manufacturing plastic containers with patterns on the surface, the pattern is usually transferred to the surface of a container blank by transfer technology, such as heat press transfer technology. Although the manufacturing method is simple, because the pattern is directly exposed on the surface of the container, the pattern will directly contact the food, which will cause food safety concerns. In addition, the pattern is also easy to wear and tear. Once the wear and tear occurs, it will significantly affect the texture of the entire container. Summary of the invention

[0003] It is an object of the present invention to provide a method for making a decal container which ameliorates at least one of the disadvantages of the prior art.

[0004] The manufacturing method of the decal container of the present invention comprises a container body and a first decal paper layer connected to the surface of the container body. The manufacturing method comprises a first decal paper blank preparation step, a decal paper blank setting step, and an injection molding step.

[0005] The first flower paper blank preparation step includes a first flower paper pre-molding sub-step and a first flower paper blank cutting sub-step. In the first flower paper pre-molding sub-step, a vacuum forming device having a first model corresponding to the container body performs thermoplastic processing on the first flower paper made of thermoplastic material to obtain a first pre-molded flower paper blank having a first molding portion of the contour of the container body, and a first pattern is provided on one surface of the first flower paper. In the first flower paper blank cutting sub-step, a cutting device cuts out the first molding portion of the first pre-molded flower paper blank to obtain a first flower paper blank having the first pattern.

[0006] In the step of setting the decal paper blank, the first decal paper blank is moved into a mold of an injection molding machine for injection molding the container body.

[0007] In the injection molding step, the injection molding machine injects hot melt plastic into the mold, and the hot melt plastic is solidified to form a surface connected to the first decal blank having the first pattern and covering the container body having the first pattern, thereby forming the decal BCPI-230245 Page 2 / 8

[0008] container.

[0009] In the manufacturing method of the decal container described in the present invention, in the first decal paper pre-molding sub-step, the first model presents the outer surface contour of the container body, and the first decal paper having the first pattern is arranged on the vacuum forming device with the surface facing the first model, and is subjected to thermoplastic processing; the mold of the injection molding machine has a male mold and a female mold that are clamped together, and in the decal paper blank setting step, the first decal paper blank is set and positioned in the female mold.

[0010] In the manufacturing method of the decal container described in the present invention, in the first decal paper pre-molding sub-step, the first model presents the inner surface contour of the container body, and the surface of the first decal paper having the first pattern is arranged in the vacuum forming device with its back to the first model, and is subjected to thermoplastic processing; the mold of the injection molding machine has a male mold and a female mold that are clamped together, and in the decal paper blank setting step, the first decal paper blank is set and positioned in the male mold.

[0011] The manufacturing method of the decal container of the present invention further comprises a second decal paper blank preparation step, the second decal paper blank preparation step comprises a second decal paper pre-molding sub-step and a second decal paper blank cutting sub-step, in the second decal paper pre-molding sub-step, a second decal paper of thermoplastic material with a second pattern on one surface thereof is placed into a blister forming device, the blister forming device has a second model corresponding to the outer surface contour of the container body, the surface of the second decal paper with the second pattern faces the second model, and the blister forming device performs thermoplastic processing on the second decal paper with the second model to obtain a decal having the container body. a second pre-molded flower paper embryo with a second molding part having an outer surface contour; in the second flower paper embryo cutting sub-step, the cutting device cuts out the second molding part of the second pre-molded flower paper embryo to obtain a second flower paper embryo with the second pattern; in the flower paper embryo setting step, the second flower paper embryo is set and positioned in the mother mold; in the injection molding step, the injection molding machine injects hot melt plastic into the mold, so that the container body formed by the solidification of the hot melt plastic is connected between the facing surfaces of the first flower paper embryo with the first pattern and the second flower paper embryo with the second pattern, so as to form the decal container.

[0012] The manufacturing method of the decal container of the present invention further comprises a step of preparing a decal paper, wherein a printer prints the first pattern on the surface of a thermoplastic film to produce the first decal paper.

[0013] BCPI-230245 Page 3 / 8

[0014] The manufacturing method of the decal container of the present invention further comprises a decal paper preparation step, wherein a printer is used to print the first pattern and the second pattern on one surface of two thermoplastic films to respectively manufacture the first decal paper and the second decal paper.

[0015] The beneficial effect of the present invention is that: through the design of the first decal paper blank preparation step, the decal paper blank setting step and the injection molding step, the pattern of the manufactured decal container can be protected by a layer of transparent adhesive film, so the pattern will not be damaged by friction at all, and will not change color or oxidize due to contact with food or air, so that the color vividness of the pattern can be maintained for a longer time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the accompanying drawings, in which:

[0017] Figure 1 is a flowchart of steps illustrating a first embodiment of a method for making a decal container of the present invention;

[0018] Figure 2 is a side sectional view schematically illustrating the structure of a decal container made in the first embodiment;

[0019] Figure 3 is a processing schematic diagram, illustrating the processing process of a first decal paper pre-molding sub-step of the first embodiment;

[0020] Figure 4 is a processing schematic diagram, illustrating the processing process of a first flower paper blank cutting sub-step of the first embodiment;

[0021] Figure 5 is a processing schematic diagram, illustrating the processing process of a second decal paper pre-molding sub-step of the first embodiment;

[0022] Figure 6 is a processing schematic diagram, illustrating the processing process of a second flower paper blank cutting sub-step of the first embodiment;

[0023] Figure 7 is a processing schematic diagram, illustrating the processing process of a flower paper blank product setting step and an injection molding step of the first embodiment;

[0024] Figure 8 is a flow chart of steps illustrating a second embodiment of a method for making a decal container of the present invention; and

[0025] Fig. 9 is a side sectional view schematically illustrating the structure of a decal container made in the second embodiment.

[0026] BCPI-230245 Page 4 / 8 DETAILED DESCRIPTION

[0027] Before the present invention is described in detail, it should be noted that similar components are denoted by the same reference numerals in the following description.

[0028] See also Figure 1 , 2 A first embodiment of the manufacturing method of the decal container 3 of the present invention is suitable for injection molding a decal container 3 made of plastic material with a pattern. The decal container 3 includes a container body 31 made of plastic material by injection molding, and a first decal layer 32 and a second decal layer 33 respectively attached to the inner surface and the outer surface of the container body 31. The first decal layer 32 has a pattern portion 320 facing the inner surface of the container body 31, and the second decal layer 33 has a pattern portion 330 facing the outer surface of the container body 31.

[0029] The manufacturing method comprises the following steps: a decal preparation step 910 , a first decal blank preparation step 920 , a second decal blank preparation step 930 , a decal blank setting step 940 , and an injection molding step 950 .

[0030] In the decal preparation step 910, a printer (not shown) is used to print a first pattern 40 (shown in FIG. Figure 3 ) and the second pattern 50 (shown in Figure 5 ), to respectively make a first flower paper 4 (shown in Figure 3 ) and a second flower paper 5 (shown in Figure 5 ). The first decal paper 4 and the second decal paper 5 will be used to be processed into the first decal paper layer 32 and the second decal paper layer 33 of the decal container 3 later. The first pattern 40 and the second pattern 50 of the first decal paper 4 and the second decal paper 5 can be the same or different. The thermoplastic film is, for example, but not limited to, food-grade transparent PET (polyethylene terephthalate) or transparent OPP film (Oriented Polypropylene). Since there are many types of printers that can print the first pattern 40 and the second pattern 50 on the thermoplastic film, and it is not the focus of the present invention, it will not be described in detail.

[0031] See also Figure 1 , 3 4. The first flower paper blank preparation step 920 includes a first flower paper pre-molding sub-step 921 and a first flower paper blank cutting sub-step 922.

[0032] In the first decal pre-molding sub-step 921, a blister molding device 6 is used to pre-mold the first decal 4 used to form the first decal layer 32. The blister molding device 6 is provided with a first mold 61 having the same inner surface contour as the container body 31. During the pre-molding process, the first decal 4 is installed in the blister molding device 6 with the side printed with the first pattern 40 facing away from the first mold 61, so that the first pattern 40 is located above the first mold 61. Then, the blister molding device 6 is passed through the BCPI-230245 Page 5 / 8

[0033] A mold 61 performs thermoplastic processing on the first flower paper 4 to obtain a first pre-molded flower paper embryo 41 having a first molding portion 411 with the inner surface contour of the container body 31, and the outer convex surface of the first molding portion 411 has the first pattern 40. Since the thermoforming device 6 heats and molds the film, which is a prior art and has many methods, it will not be described in detail.

[0034] In the first flower paper blank cutting sub-step 922, a cutting device 7 is used to cut the first pre-molded flower paper blank 41. The cutting device 7 has a first die seat 71 for placing and positioning the first pre-molded flower paper blank 41, and a first punching die 72 for cutting the first pre-molded flower paper blank 41 disposed on the first die seat 71. In this step, the first punching die 72 is used to punch and cut the first pre-molded flower paper blank 41 along the periphery of the first molding portion 411 to remove the first molding portion 411, thereby obtaining a first flower paper blank 42 corresponding to the inner surface contour of the container body 31 and having the first pattern 40, and the outer convex surface of the first flower paper blank 42 has the first pattern 40.

[0035] See also Figure 1 , 5 6. The second flower paper blank preparation step 930 includes a second flower paper pre-molding sub-step 931 and a second flower paper blank cutting sub-step 932.

[0036] In the second decal pre-molding sub-step 931, the blister molding device 6 performs a pre-molding process on the second decal 5 used to form the second decal layer 33. The blister molding device 6 is changed to set a second mold 62 with the same outer surface contour of the container body 31. During the pre-molding process, the second decal 5 is installed on the blister molding device 6 with the side printed with the second pattern 50 facing the second mold 62, so that the second pattern 50 is located above the second mold 62. Then, the blister molding device 6 performs a thermoplastic processing on the second decal 5 through the second mold 62 to obtain a second pre-molded decal embryo 51 having a second molding portion 511 with the outer surface contour of the container body 31, and the concave surface of the second molding portion 511 has the second pattern 50.

[0037] In the second flower paper blank cutting sub-step 932, the cutting device 7 is used to cut the second pre-molded flower paper blank 51. The cutting device 7 has a second die base 73 for placing and positioning the second pre-molded flower paper blank 51, and a second punching die 74 for cutting the second pre-molded flower paper blank 51 disposed on the second die base 73. In this step, the second punching die 74 is used to punch and cut the second pre-molded flower paper blank 51 along the periphery of the second molding portion 511 to obtain a second flower paper blank 52 corresponding to the outer surface contour of the container body 31 and having the second pattern 50. The inner surface of the second flower paper blank 52 is BCPI-230245 Page 6 / 8

[0038] The concave surface has said second pattern 50 .

[0039] See also Figure 1 , 7 In the decal product placement step 940, the first decal product 42 and the second decal product 52 are moved into an injection molding machine. The injection molding machine has a mold 8 for injection molding the container body 31. The mold 8 has a male mold 81 and a female mold 82. In this step, the first decal product 42 is placed in the male mold 81, and the second decal product 52 is placed in the female mold 82.

[0040] In the injection molding step 950, the male mold 81 is joined with the female mold 82 to define a molding space 80 between the first decal 42 and the second decal 52. At this time, the outer surface of the first decal 42 having the first pattern 40 is spaced apart from the inner surface of the second decal 52 having the second pattern 50. Then, the injection molding machine is used to inject hot melt plastic 800 into the molding space 80 of the mold 8, so that the hot melt plastic 800 is connected to the outer surface of the first decal 42 having the first pattern 40 and covers the first pattern 40, and the hot melt plastic 800 is connected to the inner surface of the second decal 52 having the second pattern 50 and covers the second pattern 50.

[0041] The hot melt plastic 800 in the mold 8 will solidify to form the container body 31, the first decal paper blank 42 will form the first decal paper layer 32 connected and fixed to the inner surface of the container body 31, and the second decal paper blank 52 will form the second decal paper layer 33 connected and fixed to the outer surface of the container body 31. Finally, the male mold 81 and the female mold 82 of the mold 8 are opened to take out the finished decal container 3.

[0042] In the first embodiment, the first pattern 61 and the second pattern 62 on the blister molding device 6 are replaced to respectively perform the first decal pre-molding sub-step 921 and the second decal pre-molding sub-step 931, and the first die holder 71 and the first punching die 72 and the second die holder 73 and the second punching die 74 on the cutting device 7 are replaced to respectively perform the first decal blank cutting sub-step 922 and the second decal blank cutting sub-step 932. However, in another embodiment of the present invention, when performing the first decal blank preparation step 920 and the second decal blank preparation step 930, the dedicated blister molding device 6 and the cutting device 7 can be used to improve production efficiency.

[0043] See also Figure 3 , 4 , 8, 9, a second embodiment of the method for manufacturing a decal container 3 of the present invention differs from the first embodiment in that the manufacturing method is used to manufacture a decal container 3 of the single-sided decal pattern BCPI-230245 Page 7 / 8. For the convenience of description, only the differences will be described below.

[0044] In the second embodiment, the manufacturing method only includes the decal preparation step 910, the first decal blank preparation step 920, the decal blank setting step 940, and the injection molding step 950. The first decal 4 is prepared by the decal preparation step 910, and the first decal blank preparation step 920 forms the first decal 4 into the desired first decal blank 42. In the decal blank setting step 940, the first decal blank 42 is placed into the mold 8 (shown in FIG. 8 ). Figure 7 ) in the female mold 82 or the male mold 81. In the injection molding step 950, the hot melt plastic 800 injected into the mold 8 is connected with the first decal paper blank 42 to form the decal container 3 with a single-sided decal style.

[0045] During implementation, the type of the first model 61 set in the blister molding device 6 can be modified accordingly according to the pattern setting position of the decal container 3. When the pattern is to be set on the inner surface of the container body 31, the first model 61 can be designed to correspond to the inner surface contour of the container body 31, and the first decal 4 is thermoplasticized in a manner that the side with the first pattern 40 is facing away from the first model 61, and the first decal blank 42 manufactured subsequently is placed in the male mold 81 of the mold 8 for the injection molding step 950, so that the decal container 3 with the pattern only on the inner surface can be manufactured.

[0046] On the contrary, when the pattern is to be provided on the outer surface of the container body 31, the first model 61 is designed to correspond to the outer surface contour of the container body 31, and the first decal 4 is thermoplasticized in such a way that the side provided with the first pattern 40 faces the first model 61, and the first decal blank 42 manufactured subsequently is placed in the mother mold 82 of the mold 8 for the injection molding step 950, so that the decal container 3 having the pattern only on the outer surface can be manufactured.

[0047] In the above-mentioned embodiment, the first decal 4 and the second decal 5 can be transferred into the blister forming device 6 by a robot arm or other transfer equipment, the first pre-molded decal embryo 41 and the second pre-molded decal embryo 51 can be moved out of the blister forming device 6, the first pre-molded decal embryo 41 and the second pre-molded decal embryo 51 can be moved into the cutting device 7, the first decal embryo product 42 and the second decal embryo product 52 can be moved out of the cutting device 7, and the first decal embryo product 42 and the second decal embryo product 52 can be respectively placed into the male mold 81 and the female mold 82 of the mold 8 for automatic or semi-automatic rapid production. Since there are many types of the robot arm and the transfer equipment, and they are not the focus of the present invention, they will not be described in detail.

[0048] BCPI-230245 Page 8 / 8

[0049] In summary, through the design of the first decal paper product preparation step 920, the decal paper product setting step 940 and the injection molding step 950, the pattern of the manufactured decal container 3 can be protected by a layer of transparent adhesive film, so the pattern will not be damaged by food friction, nor will it be scratched and fallen off by a cleaning brush, and the pattern will not be discolored or oxidized by contact with food or air, so that the color brightness of the pattern can be maintained for a longer time, thereby greatly improving the texture and durability of the decal container 3. And further, through the design of the second decal paper product preparation step 930, the decal container 3 with a double-sided decal style can be manufactured through the decal paper product setting step 940 and the injection molding step 950. Therefore, the manufacturing method of the decal container 3 of the present invention is indeed a very innovative creation, so it can indeed achieve the purpose of the present invention.

[0050] The above are only embodiments of the present invention and should not be used to limit the scope of the present invention. All simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A method for manufacturing a decal container, wherein the decal container comprises a container body and a first decal paper layer connected to a surface of the container body, characterized in that: The manufacturing method of the decal container comprises a first decal paper blank preparation step, a decal paper blank setting step, and an injection molding step. The first decal paper blank preparation step comprises a first decal paper pre-molding sub-step and a first decal paper blank cutting sub-step. In the first decal paper pre-molding sub-step, a vacuum forming device having a first model corresponding to the container body performs thermoplastic processing on the first decal paper made of thermoplastic material to obtain a first pre-molded decal paper embryo with a first molding portion having the contour shape of the container body. A first pattern is arranged on one surface of the first decal paper. In the product cutting sub-step, a cutting device is used to cut and remove the first molding part of the first pre-molded decal paper blank to obtain a first decal paper blank product having the first pattern; in the decal paper blank product setting step, the first decal paper blank product is moved into a mold of an injection molding machine used for injection molding the container body; in the injection molding step, the injection molding machine is used to inject hot melt plastic into the mold, so that the hot melt plastic is solidified to form a surface connected to the first decal paper blank product having the first pattern, and covers the container body having the first pattern, thereby forming the decal container.

2. The method for manufacturing a decal container according to claim 1, characterized in that: In the first decal pre-molding sub-step, the first model presents the outer surface contour of the container body, and the first decal having the first pattern is arranged on the vacuum forming device with the surface facing the first model, and is subjected to thermoplastic processing; the mold of the injection molding machine has a male mold and a female mold that are clamped together, and in the decal blank setting step, the first decal blank is set and positioned in the female mold.

3. The method for manufacturing a decal container according to claim 1, characterized in that: In the first decal pre-molding sub-step, the first model presents the inner surface contour of the container body, and the surface of the first decal having the first pattern is arranged in the vacuum forming device with its back to the first model, and is subjected to thermoplastic processing; the mold of the injection molding machine has a male mold and a female mold that are clamped together, and in the decal blank setting step, the first decal blank is set and positioned in the male mold.

4. The method for manufacturing a decal container according to claim 3, characterized in that: The manufacturing method further comprises a second flower paper blank preparation step, wherein the second flower paper blank preparation step comprises a second flower paper pre-molding sub-step and a second flower paper blank cutting sub-step. In the second decal pre-molding sub-step, a second decal made of thermoplastic material with a second pattern on one surface is placed into a blister molding device, the blister molding device having a second model corresponding to the outer surface contour of the container body, so that the surface of the second decal with the second pattern faces the second model, and the blister molding device performs thermoplastic processing on the second decal with the second model to obtain a second pre-molded decal embryo with a second molding portion having the outer surface contour of the container body. In the second decal embryo cutting sub-step, the cutting device cuts out the second molding portion of the second pre-molded decal embryo to obtain a second decal embryo with the second pattern. In the decal embryo setting step, the second decal embryo is set and positioned in the master mold. In the injection molding step, the injection molding machine injects hot melt plastic into the mold, so that the container body formed by the solidification of the hot melt plastic is connected between the facing surfaces of the first decal embryo with the first pattern and the second decal embryo with the second pattern, so as to form the decal container.

5. The method for manufacturing a decal container according to claim 1, 2 or 3, characterized in that: The manufacturing method further comprises a step of preparing a decal paper, wherein a printer is used to print the first pattern on the surface of the thermoplastic film to produce the first decal paper.

6. The method for manufacturing a decal container according to claim 4, characterized in that: The manufacturing method further comprises a step of preparing a decal paper, wherein a printer is used to print the first pattern and the second pattern on one surface of two thermoplastic films respectively, so as to respectively produce the first decal paper and the second decal paper.

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