Manufacturing process of EVA foaming double-spliced color-colliding shoes

Abstract

The invention discloses a manufacturing technology of EVA foaming double-spliced color-colliding shoes. The manufacturing technology comprises the following steps that S1, a double-spliced color-colliding mold is manufactured; s2, manufacturing and synthesizing an EVA material; s3, the forming materials of the two different colors are put into two injection guns of a double-color EVA injection molding machine in a one-to-one correspondence mode, the two injection guns inject the forming materials into the double-spliced color-colliding mold at the same time, the collision strength of the two forming materials is controlled by adjusting the ejection pressure of the two injection guns, and the color-colliding effect is adjusted; s4, forming materials are partially fused when colliding with each other at the rear position of the double-spliced color-colliding mold, and a gradient color area is formed by the fused parts of the two forming materials, S5, the first color separation plate, the cooling plate and the second color separation plate are pulled out of the mold, the first mold plate and the second mold plate are subjected to mold closing, and the color change area is formed. Enabling the forming materials in the two templates to be in contact, heating and foaming, and cooling and forming through a cold forming line after foaming to form shoes; therefore, forming materials with two different colors can be injected into the forming cavity at the same time.

Description

Technical Field

[0001] The invention relates to the field of shoemaking, and in particular to a manufacturing process of EVA foamed double-color contrasting shoes. Background Art

[0002] At present, some shoe molding molds on the market include a first molding chamber for forming the upper part of the shoe and a second molding chamber for forming the lower part of the shoe. Molding materials of different colors can be injected into the first molding chamber and the second molding chamber respectively. After cooling to a certain temperature, the partition between the first molding chamber and the second molding chamber is pulled out so that the upper part of the shoe is in contact with the lower part of the shoe. The mold is heated again for secondary molding, and the shoe can be taken out after cooling.

[0003] With the continuous development of the economy and society, people's pursuit of shoes has gradually improved. The above-mentioned molding mold and molding method can only inject molding materials of one color into the molding chamber, and inject different colors into the two molding chambers to make the upper and lower parts of the shoes form different colors. The secondary molding is simply to melt the contact parts of the upper and lower parts of the shoes to connect them. Summary of the invention

[0004] The object of the present invention is to provide a manufacturing process for double-color contrast shoes by injecting two colors of EVA foam into a molding chamber at the same time.

[0005] In order to achieve the above object, the present invention adopts such technical solution: A manufacturing process of EVA foam double-color contrast shoes, wherein the front part of the shoe is from one end of the instep close to the human ankle to the other end, and the back part of the shoe is from the human arch to the position of the instep close to the human ankle, and the back part of the shoe is from the human arch to the position of the instep close to the human ankle. The process comprises the following steps: S1: Making a double color contrast mold: Making a color contrast mold, the color contrast mold comprising a first template, a first color isolation plate, a cooling plate, a second color isolation plate and a second template connected in sequence, the first template having a first molding cavity for forming the upper part of the shoe, and the second template having a second molding cavity for forming the lower part of the shoe; A first feed hole is provided on the first color separator plate, a first feed channel is provided in the first color separator plate, the first feed hole is communicated with the first feed channel, the first feed channel is used to inject molding material into the front of the first molding cavity and the front of the second molding cavity, a second feed hole is provided on the second color separator plate, the second feed hole is provided on the second color separator plate, a second feed channel is provided in the second color separator plate, the second feed hole is communicated with the second feed channel, the second feed channel is used to inject molding material into the rear of the first molding cavity and the rear of the second molding cavity, and the color proportion of the front and rear of the shoe is adjusted by adjusting the inner diameter ratio of the first feed channel and the second feed channel; S2: Preparation and synthesis of EVA materials: preparation of two molding materials of different colors; S3: Put the two different colors of molding materials prepared in step S2 into two molding machines one by one, wherein the discharge port of one molding machine is connected to the first feed hole, and the discharge port of the other molding machine is connected to the second feed hole, and the contrasting color effect is adjusted by adjusting the injection pressure of the two molding machines; S4: two molding machines spray molding materials simultaneously, wherein molding materials of one color enter the front of the first molding cavity and the front of the second molding cavity, and molding materials of another color enter the rear of the first molding cavity and the rear of the second molding cavity, and the two molding materials in the first molding cavity and the second molding cavity partially melt when they collide with each other, and are cooled and semi-molded, and the melted part of the two molding materials forms a gradient color area, the upper part of the shoe is formed in the first molding cavity, and the lower part of the shoe is formed in the second molding cavity; S5: After heating the first template and the second template by the cooling plate, the first color isolation plate, the cooling plate and the second color isolation plate are pulled out from the contrasting color mold, and the first template and the second template are molded together so that the upper part of the shoe contacts the lower part of the shoe, and cooled and formed to form a shoe.

[0006] Preferably, the color ratio of the front and rear of the shoe can be confirmed by trial mold.

[0007] Preferably, both the first feed channel and the second feed channel are provided with flow control bolts, and the flow rate is adjusted by the flow control bolts to adjust the color ratio of the front part and the back part of the shoe.

[0008] Preferably, the temperature in the gun is 85°C-100°C, and the foaming temperature in the mold is 175°C-195°C.

[0009] By adopting the above-mentioned design scheme, the beneficial effect of the present invention is as follows: the contrasting color mold prepared by the present invention can simultaneously inject molding materials of different colors into the front and rear of the molding chamber respectively, so that the two colors of molding materials collide and blend with each other in a specific area, so that the front and rear of the shoe can form different colors, and the middle part of the shoe forms a gradient color area. The color ratio of the front and rear of the shoe is adjusted by adjusting the inner diameter ratio of the first feed channel and the second feed channel, and the contrasting color effect is adjusted by adjusting the injection pressure of the two molding machines. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a front view of the contrasting color mold of the present invention; Figure 2 is a schematic structural diagram of the first color isolation plate of the present invention; Figure 3 is a schematic structural diagram of a second color isolation plate of the present invention; Figure 4 It is a feeding schematic diagram of the present invention; Figure 5 It is a schematic structural diagram of a cooling plate of the present invention; In the figure: a first template 10, a first color isolating plate 20, a first feed hole 21, a cooling plate 30, a temperature sensing hole 31, a second color isolating plate 40, a second feed hole 41, a second template 50, a first feed column 61, a second feed column 62, a third feed column 63, a fourth feed column 64, a first main channel 71, a first branch channel 72, a second branch channel 73, a second main channel 81, a third branch channel 82, a fourth branch channel 83, and a flow control bolt 91. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] A manufacturing process of EVA foam double-color contrast shoes, wherein the front part of the shoe is from one end of the instep close to the human ankle to the other end, and the back part of the shoe is from the human arch to the position of the instep close to the human ankle, and the manufacturing process comprises the following steps: S1: Double color contrast mold production: Make a contrast color mold, such as Figure 1-Figure 5As shown, the contrasting color mold includes a first template 10, a first color isolation plate 20, a cooling plate 30, a second color isolation plate 40 and a second template 50 which are connected in sequence. The first template 10 has a first molding cavity for forming the upper part of the shoe, and the second template 50 has a second molding cavity for forming the lower part of the shoe. A first feed hole 21 is provided on the first color separator 20, and a first feed channel is provided in the first color separator 20, and the first feed hole 21 is connected to the first feed channel, and the first feed channel is used to inject molding material into the front of the first molding cavity and the front of the second molding cavity; a second feed hole is provided on the second color separator 40, and a second feed hole 41 is provided on the second color separator 40, and a second feed channel is provided in the second color separator 40, and the second feed hole 41 is connected to the second feed channel, and the second feed channel is used to inject molding material into the rear of the first molding cavity and the rear of the second molding cavity, and the color ratio of the front and rear of the shoe is adjusted by adjusting the inner diameter ratio of the first feed channel and the second feed channel; In this embodiment, the color ratio of the front and back of the shoe can also be confirmed through a trial mold.

[0013] S2: Preparation and synthesis of EVA materials: two different colors of molding materials are prepared in a conventional manner; S3: The two molding materials of different colors prepared in step S2 are placed into two molding machines respectively, wherein the discharge port of one molding machine is connected to the first feed hole 21, and the discharge port of the other molding machine is connected to the second feed hole 41, and the contrasting color effect is adjusted by adjusting the injection pressure of the two molding machines; the contrasting color effect here is the gradient color effect produced by the collision and fusion of the two colors of molding materials.

[0014] S4: two molding machines spray molding materials simultaneously, wherein one color of molding materials enters the front of the first molding cavity and the front of the second molding cavity, and another color of molding materials enters the rear of the first molding cavity and the rear of the second molding cavity, and the two molding materials in the first molding cavity and the second molding cavity partially melt when they collide with each other, and are cooled and semi-molded, and the melted part of the two molding materials forms a gradient color area, the upper part of the shoe is formed in the first molding cavity, and the lower part of the shoe is formed in the second molding cavity; S5: After heating the first template 10 and the second template 50 through the cooling plate 30, the first color isolation plate 20, the cooling plate 30 and the second color isolation plate 40 are pulled out from the contrasting color mold, and the first template 10 and the second template 50 are molded together so that the upper part of the shoe contacts the lower part of the shoe, and cooled and formed to form the shoe.

[0015] In this embodiment, the temperature in the shooting gun is 85°C-100°C, and the foaming temperature in the mold is 175°C-195°C.

[0016] In this embodiment, the first template 10 has two first molding chambers, and the second template 50 has two second molding chambers. The two first molding chambers and the two second molding chambers are respectively arranged in one-to-one correspondence. The two first molding chambers are used to form the upper part of a pair of shoes, i.e., the upper part of the left foot and the upper part of the right foot, and the two second molding chambers are used to form the lower part of a pair of shoes.

[0017] The first feed channel is connected to a first feed column 61 for feeding into the first molding chamber and a second feed column 62 for feeding into the second molding chamber; in this embodiment, the first connecting channel is connected to two first feed columns 61 and two second feed columns 62, the two first feed columns 61 are respectively arranged in a one-to-one correspondence with the two first molding chambers, and the two second feed columns 62 are respectively arranged in a one-to-one correspondence with the two second molding chambers; the molding material is injected into the two first molding chambers through the two first feed columns 61, and the molding material is injected into the two second molding chambers through the two second feed columns 62.

[0018] In this embodiment, the first feed channel includes a first main channel 71, two first branch channels 72 and two second branch channels 73, the two first branch channels 72 are connected to both sides of the first main channel 71 respectively, and the two second branch channels 73 are connected to both sides of the first main channel 71 respectively, and the two first feed columns 61 are connected to the two first branch channels 72 respectively, and the two second feed columns 62 are connected to the two second branch channels 73 respectively; the distance between the first feed column 61 and the first feed hole 21 is greater than the distance between the second feed column 62 and the first feed hole 21. Since the second feed column 62 needs to pass through the cooling plate 30 and the second color isolation plate 40 to enter the second molding chamber, the distance between the second feed column 62 and the first feed hole 21 is shortened so that the first feed column 61 and the second feed column 62 can inject molding material into the molding chamber at the same time, so that the upper and lower parts of the formed shoes correspond to each other.

[0019] The second feed channel is connected with a third feed column 63 for feeding into the first molding chamber and a fourth feed column 64 for feeding into the second molding chamber; in this embodiment, the second connecting channel is connected with two third feed columns 63 and two fourth feed columns 64, the two third feed columns 63 are respectively arranged in a one-to-one correspondence with the two first molding chambers, and the two fourth feed columns 64 are respectively arranged in a one-to-one correspondence with the two second molding chambers. The molding material is injected into the two first molding chambers in a one-to-one correspondence through the two third feed columns 63, and the molding material is injected into the two second molding chambers in a one-to-one correspondence through the two fourth feed columns 64.

[0020] The second feed channel includes a second main channel 81, two third branch channels 82 and two fourth branch channels 83, the two third branch channels 82 are connected to both sides of the second main channel 81 respectively, the two fourth branch channels 83 are connected to both sides of the second main channel 81 respectively, the two third feed columns 63 are connected to the two third branch channels 82 respectively, the two fourth feed columns 64 are connected to the two fourth branch channels 83 respectively, the distance between the third feed column 63 and the second feed hole 41 is greater than the distance between the fourth feed column 64 and the second feed hole 41; since the fourth feed column 64 needs to pass through the cooling plate 30 and the second color isolation plate 40 to enter the first molding chamber, the distance between the fourth feed column 64 and the second feed hole 41 is shortened so that the feeding speeds of the third feed column 63 and the fourth feed column 64 are consistent.

[0021] The first feed column 61 is located in the first molding chamber away from the first feed hole 21, the third feed column 63 is located in the first molding chamber close to the first feed hole 21, the second feed column 62 is located in the second molding chamber away from the first feed hole 21, and the fourth feed column 64 is located in the second molding chamber close to the first feed hole 21. The molding material injected through the first feed column 61 and the second feed column 62 is used to form the front part of the shoe, and the molding material injected through the third feed column 63 and the fourth feed column 64 is used to form the rear part of the shoe.

[0022] Each first branch channel 72, each second branch channel 73, each third branch channel 82 and each fourth branch channel 83 is connected to a flow control bolt 91. The flow rate of the branch channel is adjusted by adjusting the flow control bolt 91. On the one hand, the color ratio of the molding material at the front and the back of the shoe is controlled, that is, the ratio of the two colors on the shoe is controlled. On the other hand, the contrasting color mold can be suitable for shoes with different color ratios, thereby improving the applicability of the contrasting color mold and saving production costs.

[0023] The central axis of the first feed hole 21 is gradually inclined toward the first main channel 71 from one end away from the first main channel 71 to the other end, and the central axis of the second feed hole 41 is gradually inclined toward the second main channel 81 from one end away from the second main channel 81 to the other end; so that the molding material can flow into the main channel faster when it is injected through the feed hole.

[0024] Two temperature sensing holes 31 arranged opposite to each other are formed on the cooling plate 30 . The temperature sensing holes 31 are used to place temperature sensing devices so as to monitor the temperature of the cooling plate 30 .

[0025] In summary, the contrasting color mold prepared by the present invention can simultaneously inject two colors of molding materials into the molding chamber, so that the two colors of molding materials collide and blend with each other in a specific area, so that the front and back of the shoe can form different colors, and the middle part of the shoe forms a gradient color area.

[0026] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A manufacturing process of EVA foam double-color contrast shoes, characterized by: The front part of the shoe is defined as the area from one end of the instep close to the human ankle to the other end, and the back part of the shoe is defined as the area from the human arch to the instep close to the human ankle. The method comprises the following steps: S1: Making a double color contrast mold: Making a color contrast mold, the color contrast mold comprising a first template, a first color isolation plate, a cooling plate, a second color isolation plate and a second template connected in sequence, the first template having a first molding cavity for forming the upper part of the shoe, and the second template having a second molding cavity for forming the lower part of the shoe; A first feed hole is provided on the first color separator plate, a first feed channel is provided in the first color separator plate, the first feed hole is communicated with the first feed channel, the first feed channel is used to inject molding material into the front of the first molding cavity and the front of the second molding cavity, a second feed hole is provided on the second color separator plate, the second feed hole is provided on the second color separator plate, a second feed channel is provided in the second color separator plate, the second feed hole is communicated with the second feed channel, the second feed channel is used to inject molding material into the rear of the first molding cavity and the rear of the second molding cavity, and the color proportion of the front and rear of the shoe is adjusted by adjusting the inner diameter ratio of the first feed channel and the second feed channel; S2: Preparation and synthesis of EVA materials: prepare two different colors of EVA molding materials, each color of EVA molding materials includes, by weight: 60 parts of EVA, 20 parts of POE, 5 parts of modifier, 6 parts of talcum powder, 0.1 parts of accelerator, 1 part of zinc oxide, 0.1 parts of zinc stearate, 0.3 parts of stearic acid, 0.5 parts of flow agent, 0.21 parts of foaming agent, 0.068 parts of odorless adhesive and 6.722 parts of color powder; S3: Put the two molding materials of different colors prepared in step S2 into two shooting guns of a two-color EVA injection molding machine one by one, wherein the discharge port of one shooting gun is connected to the first feeding hole, and the discharge port of the other shooting gun is connected to the second feeding hole, and the impact force of the two molding materials is controlled by adjusting the injection pressure of the two shooting guns to adjust the color contrast effect; S4: two guns spray molding materials simultaneously, wherein molding materials of one color enter the front of the first molding cavity and the front of the second molding cavity, and molding materials of another color enter the rear of the first molding cavity and the rear of the second molding cavity, and the two molding materials in the first molding cavity and the second molding cavity partially blend when they collide with each other at the rear of the molding cavity, and the blended part of the two molding materials forms a gradient color area, the upper part of the shoe is formed in the first molding cavity, and the lower part of the shoe is formed in the second molding cavity; S5: The first color isolating plate, the cooling plate and the second color isolating plate are pulled out from the mold, and the first template and the second template are molded together so that the molding materials in the two templates are in contact and heated for foaming. After foaming, the molding materials are cooled and molded on a cold setting line to form a shoe.

2. The manufacturing process of the EVA foam double-color contrasting shoes according to claim 1, characterized in that: Confirm the color ratio of the front and back of the shoe through trial molds.

3. The manufacturing process of the EVA foam double-color contrasting shoes according to claim 1, characterized in that: The first feed channel and the second feed channel are both provided with flow control bolts, and the flow rate is adjusted by the flow control bolts to adjust the color ratio of the front part and the rear part of the shoe.

4. The manufacturing process of the EVA foam double-color contrasting shoes according to claim 1, characterized in that: The temperature in the shooting gun is 85℃-100℃, and the foaming temperature in the mold is 175℃-195℃.

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