Manufacturing process for eva-foamed two-tone color-blocking shoe

Abstract

Disclosed in the present invention is a manufacturing process for an EVA-foamed two-tone color-blocking shoe, comprising the following steps: S1: manufacturing a two-tone color-blocking mold; S2: preparing and synthesizing an EVA material; S3: respectively placing two molding materials of different colors into two injection units of a two-color EVA injection molding machine in one-to-one correspondence, the two injection units simultaneously injecting the molding materials into the two-tone color-blocking mold, and controlling the impact strengths of the two molding materials by adjusting injection pressures of the two injection units, so as to adjust a color-blocking effect; S4: the molding materials partially fusing when colliding with each other at the rear portion of the two-tone color-blocking mold, and a fused portion of the two molding materials forming a gradual color transition region; and S5: taking out a first color separation plate, a cooling plate, and a second color separation plate from the mold, closing a first mold plate and a second mold plate, so that the molding materials in the two mold plates are in contact with each other, performing heating and foaming, and once foaming has been performed, performing cooling and molding by means of a cold setting line to form a shoe. The molding materials of two different colors can be injected into a molding chamber at the same time.

Description

A manufacturing process for EVA foam two-tone color-blocked shoes Technical Field

[0001] This invention relates to the field of footwear manufacturing, specifically to a manufacturing process for EVA foam two-tone color-blocked shoes. Background Technology

[0002] Currently, 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. Different colored molding materials 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 removed, so that the upper part of the shoe comes into contact with the lower part of the shoe. The mold is then heated again for secondary molding. After cooling, the shoe can be taken out.

[0003] With the continuous development of the economy and society, people's pursuit of shoes has gradually increased. The above-mentioned molding mold and molding method can only inject molding raw materials of one color into the molding cavity. By injecting different colors into the two molding cavities, the upper and lower parts of the shoe are made to have different colors. Secondary molding is simply melting the parts of the upper and lower parts of the shoe that are in contact to connect them. Technical issues

[0004] The purpose of this invention is to provide a manufacturing process for two-tone EVA foam shoes that can simultaneously inject two colors of EVA foam into a molding cavity. Technical solutions

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A manufacturing process for a two-tone EVA foam shoe, comprising the following steps, with the front of the shoe extending from one end of the instep near the ankle to the other, and the rear of the shoe extending from the arch of the foot to the instep near the ankle:

[0007] S1: Two-tone color blocking mold making: Make a color blocking mold, which includes a first template, a first color separating plate, a cooling plate, a second color separating plate and a second template connected in sequence. The first template has a first molding chamber for forming the upper part of the shoe and the second template has a second molding chamber for forming the lower part of the shoe.

[0008] The first color-separating plate has a first feeding hole and a first feeding channel. The first feeding hole and the first feeding channel are connected. The first feeding channel is used to inject molding material into the front part of the first molding cavity and the front part of the second molding cavity. The second color-separating plate has a second feeding hole and a second feeding channel. The second feeding hole and the second feeding channel are connected. The second feeding channel is used to inject molding material into the rear part of the first molding cavity and the rear part of the second molding cavity. The color ratio of the front and rear parts of the shoe can be adjusted by adjusting the ratio of the inner diameter of the first feeding channel and the second feeding channel.

[0009] S2: EVA material fabrication and synthesis: preparation of two different colored molding materials;

[0010] S3: Place the two different colored molding materials prepared in step S2 into two molding machines one by one. The outlet of one molding machine is connected to the first feed hole, and the outlet of the other molding machine is connected to the second feed hole. Adjust the color contrast effect by adjusting the injection pressure of the two molding machines.

[0011] S4: Two molding machines simultaneously spray molding materials. One color of molding material enters the front part of the first molding cavity and the front part of the second molding cavity, while the other color of molding material enters the rear part of the first molding cavity and the rear part of the second molding cavity. When the two types of molding materials in the first molding cavity and the second molding cavity collide with each other, they partially fuse. After cooling, the material is semi-formed. The fused part of the two types of 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.

[0012] S5: After heating the first template and the second template by the cooling plate, the first color-separating plate, the cooling plate and the second color-separating plate are extracted from the color-blocking mold, and the first template and the second template are closed so that the upper part of the shoe comes into contact with the lower part of the shoe, cools and forms the shoe.

[0013] Preferably, the color ratio of the front and back of the shoe can be confirmed through trial molding.

[0014] Preferably, both the first and second feeding channels are equipped with flow control bolts, which adjust the flow rate and thus the color ratio of the front and back of the shoe.

[0015] Preferably, the temperature inside the injection gun is 85℃-100℃, and the foaming temperature inside the mold is 175℃-195℃. Beneficial effects

[0016] By adopting the aforementioned design scheme, the beneficial effects of the present invention are as follows: The present invention can simultaneously inject molding materials of different colors into the front and rear parts of the molding chamber through the color-blocking mold, so that the two colors of molding materials collide and merge with each other in a specific area, so that the front and rear parts 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 parts of the shoe can be adjusted by adjusting the ratio of the inner diameter of the first feeding channel and the second feeding channel, and the color-blocking effect can be adjusted by adjusting the injection pressure of the two molding machines. Attached Figure Description

[0017] Figure 1 is a front view of the color-blocking mold of the present invention;

[0018] Figure 2 is a schematic diagram of the structure of the first color-separating plate of the present invention;

[0019] Figure 3 is a schematic diagram of the structure of the second color-separating plate of the present invention;

[0020] Figure 4 is a schematic diagram of the feeding process of the present invention;

[0021] Figure 5 is a schematic diagram of the cooling plate of the present invention;

[0022] In the diagram: First template 10, first color separation plate 20, first feed hole 21, cooling plate 30, temperature sensing hole 31, second color separation plate 40, second feed hole 41, second template 50, first feed column 61, second feed column 62, third feed column 63, fourth feed column 64, first main channel 71, first branch channel 72, second branch channel 73, second main channel 81, third branch channel 82, fourth branch channel 83, flow control bolt 91. The best embodiment of the present invention

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] A manufacturing process for EVA foam two-tone color-blocked shoes, with the front of the shoe defined as the section from the instep near the ankle to the other end, and the rear of the shoe defined as the section from the arch of the foot to the instep near the ankle, includes the following steps:

[0025] S1: Two-tone color blocking mold making: Make a color blocking mold as shown in Figures 1-5. The color blocking mold includes a first template 10, a first color separating plate 20, a cooling plate 30, a second color separating plate 40, and a second template 50 connected in sequence. The first template 10 has a first molding chamber for forming the upper part of the shoe, and the second template 50 has a second molding chamber for forming the lower part of the shoe.

[0026] The first color-separating plate 20 has a first feeding hole 21 and a first feeding channel inside. The first feeding hole 21 is connected to the first feeding channel. The first feeding channel is used to inject molding material into the front part of the first molding cavity and the front part of the second molding cavity. The second color-separating plate 40 has a second feeding hole 41 and a second feeding channel inside. The second feeding hole 41 is connected to the second feeding channel. The second feeding channel is used to inject molding material into the rear part of the first molding cavity and the rear part of the second molding cavity. The color ratio of the front and rear parts of the shoe can be adjusted by adjusting the ratio of the inner diameter of the first feeding channel and the second feeding channel.

[0027] In this embodiment, the color ratio of the front and back of the shoe can also be confirmed through trial molding.

[0028] S2: EVA material fabrication and synthesis: Two different colored molding materials are prepared using conventional methods;

[0029] S3: Place the two different colored molding materials prepared in step S2 into two molding machines one by one. The outlet of one molding machine is connected to the first feed hole 21, and the outlet of the other molding machine is connected to the second feed hole 41. Adjust the color-blocking effect by adjusting the injection pressure of the two molding machines. The color-blocking effect here is the gradient color effect produced by the collision and fusion of the two colored molding materials.

[0030] S4: Two molding machines simultaneously spray molding material. One color of molding material enters the front part of the first molding cavity and the front part of the second molding cavity, while the other color of molding material enters the rear part of the first molding cavity and the rear part of the second molding cavity. When the two molding materials in the first molding cavity and the second molding cavity collide with each other, they partially fuse. After cooling, the semi-molded material is formed. The fused 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.

[0031] S5: After heating the first template 10 and the second template 50 by the cooling plate 30, the first color separation plate 20, the cooling plate 30 and the second color separation plate 40 are pulled out from the color blocking mold, and the first template 10 and the second template 50 are closed so that the upper part of the shoe comes into contact with the lower part of the shoe, cools and forms the shoe.

[0032] In this embodiment, the temperature inside the gun is 85℃-100℃, and the foaming temperature inside the mold is 175℃-195℃.

[0033] 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 a one-to-one correspondence. The two first molding chambers are used to form the upper part of a pair of shoes, namely 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.

[0034] The first feeding channel is connected to a first feeding column 61 for feeding into the first molding chamber and a second feeding column 62 for feeding into the second molding chamber. In this embodiment, the first connecting channel is connected to two first feeding columns 61 and two second feeding columns 62. The two first feeding columns 61 are respectively arranged in a one-to-one correspondence with the two first molding chambers, and the two second feeding columns 62 are respectively arranged in a one-to-one correspondence with the two second molding chambers. Molding material is injected into the two first molding chambers through the two first feeding columns 61, and molding material is injected into the two second molding chambers through the two second feeding columns 62.

[0035] In this embodiment, the first feeding 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 respectively connected to both sides of the first main channel 71, and the two second branch channels 73 are respectively connected to both sides of the first main channel 71. The two first feeding columns 61 are respectively connected to the two first branch channels 72, and the two second feeding columns 62 are respectively connected to the two second branch channels 73. The distance between the first feeding column 61 and the first feeding hole 21 is greater than the distance between the second feeding column 62 and the first feeding hole 21. Since the second feeding column 62 needs to pass through the cooling plate 30 and the second color separation plate 40 to enter the second molding chamber, the distance between the second feeding column 62 and the first feeding hole 21 is shortened so that the first feeding column 61 and the second feeding column 62 can simultaneously inject molding material into the molding chamber, so that the upper and lower parts of the formed shoe correspond to each other.

[0036] The second feeding channel is connected to a third feeding column 63 for feeding into the first molding chamber and a fourth feeding column 64 for feeding into the second molding chamber. In this embodiment, the second connecting channel is connected to two third feeding columns 63 and two fourth feeding columns 64. The two third feeding columns 63 are respectively arranged in a one-to-one correspondence with the two first molding chambers, and the two fourth feeding columns 64 are respectively arranged in a one-to-one correspondence with the two second molding chambers. Molding material is injected into the two first molding chambers through the two third feeding columns 63, and molding material is injected into the two second molding chambers through the two fourth feeding columns 64.

[0037] The second feeding 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, and the two fourth branch channels 83 are connected to both sides of the second main channel 81. The two third feed columns 63 are connected to the two third branch channels 82, and the two fourth feed columns 64 are connected to the two fourth branch channels 83. 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 separation plate 40 to enter the first molding chamber, the distance between the fourth feed column 64 and the second feed hole 41 is shortened to make the feeding speed of the third feed column 63 and the fourth feed column 64 the same.

[0038] 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 near 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 near 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.

[0039] Each of the first branch channels 72, the second branch channels 73, the third branch channels 82, and the fourth branch channels 83 is connected to a flow control bolt 91. By adjusting the flow control bolt 91, the flow rate of the branch channels can be adjusted. On the one hand, this controls the color ratio of the molding material at the front and back of the shoe, that is, it controls the ratio of the two colors on the shoe. On the other hand, it makes the color-blocking mold applicable to shoes with different color ratios, thereby improving the applicability of the color-blocking mold and saving production costs.

[0040] The central axis of the first feed hole 21 is inclined from one end away from the first main channel 71 towards the first main channel 71 to the other end, and the central axis of the second feed hole 41 is inclined from one end away from the second main channel 81 towards the second main channel 81 to the other end; so that the molding material can flow into the main channel more quickly when it is injected through the feed hole.

[0041] The cooling plate 30 has two opposing temperature sensing holes 31, which are used to house temperature sensing devices to monitor the temperature of the cooling plate 30.

[0042] In summary, the present invention uses a color-blocking mold to simultaneously inject two colors of molding material into the molding cavity, so that the two colors of molding material collide and fuse with each other in a specific area, resulting in different colors at the front and back of the shoe, and a gradient color area in the middle of the shoe.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manufacturing process for EVA foam two-tone color-blocked shoes, characterized in that: The forefoot of the shoe is defined as the section from the point on the instep closest to the ankle to the other end, and the heel of the shoe is defined as the section from the arch of the foot to the point on the instep closest to the ankle. The process includes the following steps: S1: Two-tone color blocking mold making: Make a color blocking mold, which includes a first template, a first color separating plate, a cooling plate, a second color separating plate and a second template connected in sequence. The first template has a first molding chamber for forming the upper part of the shoe and the second template has a second molding chamber for forming the lower part of the shoe. The first color-separating plate has a first feeding hole and a first feeding channel. The first feeding hole and the first feeding channel are connected. The first feeding channel is used to inject molding material into the front part of the first molding cavity and the front part of the second molding cavity. The second color-separating plate has a second feeding hole and a second feeding channel. The second feeding hole and the second feeding channel are connected. The second feeding channel is used to inject molding material into the rear part of the first molding cavity and the rear part of the second molding cavity. The color ratio of the front and rear parts of the shoe can be adjusted by adjusting the ratio of the inner diameter of the first feeding channel and the second feeding channel. S2: EVA material manufacturing and synthesis: Two different colored EVA molding materials are prepared. The EVA molding materials of each color include, by weight, 60 parts EVA, 20 parts POE, 5 parts modifier, 6 parts talc, 0.1 parts quick-setting agent, 1 part zinc oxide, 0.1 parts zinc stearate, 0.3 parts stearic acid, 0.5 parts flow agent, 0.21 parts foaming agent, 0.068 parts odorless adhesive and 6.722 parts color powder; S3: Place the two different colored molding materials prepared in step S2 into the two injection guns of a two-color EVA injection molding machine, one by one. The outlet of one injection gun is connected to the first feed hole, and the outlet of the other injection gun is connected to the second feed hole. The impact force of the two molding materials is controlled by adjusting the injection pressure of the two injection guns, and the color contrast effect is adjusted. S4: Two guns simultaneously spray molding material. One color of molding material enters the front part of the first molding cavity and the front part of the second molding cavity, while the other color of molding material enters the rear part of the first molding cavity and the rear part of the second molding cavity. When the two types of molding materials in the first molding cavity and the second molding cavity collide with each other at the rear position of the molding cavity, they partially fuse together. The fused part of the two types of 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-separating plate, the cooling plate and the second color-separating plate are extracted from the mold, and the first template and the second template are closed so that the molding material in the two templates comes into contact and is heated and foamed. After foaming, it is cooled and shaped by the cold setting line to form a shoe.

2. The manufacturing process of the EVA foaming double-stitched color-changing shoes according to claim 1, characterized in that: The color ratio between the front and back of the shoe was confirmed through trial molding.

3. The manufacturing process of the EVA foam two-tone color-blocked shoes as described in claim 1, characterized in that: Both the first and second feeding channels are equipped with flow control bolts. The flow rate is adjusted by the flow control bolts, thereby adjusting the color ratio between the front and back of the shoe.

4. The manufacturing process of the EVA foam two-tone color-blocked shoes as described in claim 1, characterized in that: The temperature inside the injection gun is 85℃-100℃, and the foaming temperature inside the mold is 175℃-195℃.

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