A method of making a two or more color foamed product

Abstract

The application discloses a method for manufacturing a double-color or multi-color foaming product. Two or more small molds are prepared for injection molding and foaming molding turnover. Step 1: a double-color or multi-color cold blank is injection molded by using an injection molding machine. A first small mold placing position is reserved in an injection molding mold frame of the injection molding machine, and the small mold is placed in the first small mold placing position to be positioned. Step 2: a double-color or multi-color product is foaming molded by using a foaming molding machine. A second small mold placing position is reserved in a foaming molding mold frame of the foaming molding machine, and the small mold and the double-color or multi-color cold blank in the small mold are placed in the second small mold placing position to be positioned, and the double-color or multi-color product is foaming molded. Step 3: the small mold is taken out from the second small mold placing position, cooled, opened, and the double-color or multi-color product is taken out. The empty small mold is recycled to step 1. In this way, the manufacturing yield and efficiency are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foaming products, in particular to a method for manufacturing a two-color or multi-color foaming product, which is mainly but not limited to a foaming sole and can be used to manufacture a two-color, multi-color, multi-density foaming sole and other similar two-color, multi-color, multi-density foaming material products. BACKGROUND

[0002] Foaming products are widely used, and common foaming products include single-color, two-color, and multi-color foaming products.

[0003] Taking a sole as an example, a foaming sole is widely used in products such as basketball shoes, sports shoes, and travel shoes. During production and manufacturing, a previously processed unfoamed sole blank is directly placed in a mold. The mold itself has a certain amount of heat, which can be understood as being higher than room temperature. When placing different accessories (usually accessories of different colors) of the sole blank, there is a sequence, so that the temperature of each accessory of the sole blank in contact with the mold core is not the same, resulting in different heating of each accessory of the sole blank of different colors. Moreover, during the foaming and molding process, each accessory of the sole blank is prone to deviation, resulting in problems such as color overflow and color mixing in the produced foaming sole. Considering the aesthetics of the sole, subsequent manual inspection of each sole is required, and a hand-held color correction pen is used to draw on the sole or the side of the sole, which is time-consuming and labor-intensive and affects the manufacturing efficiency of the sole.

[0004] Later, a method for processing an EVA multi-color sole was developed. Multiple unfoamed product blanks corresponding to different colors are assembled in a cold mold core according to a designed sole pattern. The cold mold core is installed in a lower mold seat. Two wedge-shaped clamping tables are sequentially pressed down to fix the sliding blocks of the two mold cores of the lower mold seat. The compression springs in the sliding guide clamping grooves of the lower mold seat move to the middle position of the mold core. The clamping protrusions on the fixed sliding blocks of the two mold cores press the mold core to fix the mold core at the front end, rear end, and upper and lower positions to complete the closing work. In actual operation, the worker needs to assemble multiple unfoamed product blanks corresponding to different colors into a set, weigh them, and ensure that the weight of each set is within the set range. If the weight is too heavy or too light, the worker needs to repeatedly adjust the accessories, which takes a lot of time. Subsequently, the set is placed in the mold core. Moreover, manual placement is low in efficiency and prone to placement deviation, which affects the manufacturing precision of the sole.

[0005] Therefore, it is necessary to develop a new technical solution to solve the above problems. SUMMARY

[0006] In view of the above, the present application aims at the defects of the prior art, and the main purpose is to provide a two-color or multi-color foaming product manufacturing method, which takes small molds as carriers, obtains two-color or multi-color product cold blanks through two-color or multi-color injection molding, and then puts the small molds into a foaming molding machine for direct heating and foaming molding, effectively solving the problems of color overflow and color mixing, saving the cooling standby time of the foaming molding machine, and also eliminating the need for manual weighing, weight distribution and placing of multiple unfoamed product blanks, which is suitable for batch production and greatly improves the manufacturing yield and efficiency.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A two-color or multi-color foaming product manufacturing method, preparing two or more small molds for injection molding and foaming molding turnover; the manufacturing method comprises the following steps:

[0009] Step 1: using an injection molding machine to injection mold two-color or multi-color product cold blanks;

[0010] A first small mold placing position is reserved in the injection molding mold frame of the injection molding machine, and the small mold is placed in the first small mold placing position to be positioned; wherein the small mold comprises an upper molding plate and a lower molding plate, the top of the lower molding plate is concave downward to form a lower molding concave surface, the bottom of the upper molding plate is concave upward to form an upper molding concave surface, and a foaming molding cavity is formed between the lower molding concave surface and the upper molding concave surface; the small mold is injection molded with two-color or multi-color cold blanks;

[0011] Step 2: using a foaming molding machine to foaming mold two-color or multi-color products;

[0012] A second small mold placing position is reserved in the foaming molding mold frame of the foaming molding machine, the small mold of step 2 is taken out from the injection molding mold frame, the small mold and the two-color or multi-color cold blanks located in the small mold are placed in the second small mold placing position to be positioned, and the foaming molding machine is heated to make the two-color or multi-color cold blanks in the small mold foaming molded into two-color or multi-color products;

[0013] Step 3: taking out the small mold from the second small mold placing position, cooling, opening the small mold, and taking out the two-color or multi-color products; the empty small mold is recycled to step 1.

[0014] As a preferred embodiment, a plurality of second small mold placing positions are reserved in the foaming molding mold frame of the foaming molding machine, a plurality of small molds are placed in the corresponding second small mold placing positions, and a plurality of two-color or multi-color products are foaming molded at one time by the same foaming molding machine.

[0015] As a preferred mode, the outer periphery of the small mold matches the first small mold placement position and the second small mold placement position, and the foaming cavities of different small molds are different, so that the small mold is replaced to meet different product manufacturing.

[0016] As a preferred mode, the upper and lower stacking surfaces of the upper forming plate and the lower forming plate are designed as zigzag surfaces to achieve upper and lower clamping positioning.

[0017] As a preferred mode, a color separation plate is also provided, which is selectively arranged between the upper forming plate and the lower forming plate.

[0018] As a preferred mode, in step 1, by controlling the shot amount, the weight of the two-color or multi-color cold blank of the injection molding is ensured to meet the standard.

[0019] Compared with the prior art, the present application has obvious advantages and beneficial effects. Specifically, as known from the above technical solution, it mainly uses a small mold as a carrier, obtains a two-color or multi-color product cold blank through two-color or multi-color injection molding, and then puts the small mold into a foaming molding machine for direct heating and foaming molding, effectively solving the problems of color overflow and color mixing, saving the cooling standby time of the foaming molding machine, and also eliminating the need for manual weighing, weight matching and placing multiple unfoamed product blanks, which is suitable for batch production and greatly improves the production yield and efficiency.

[0020] To more clearly illustrate the structural features and effects of the present application, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments: BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a two-color or multi-color foamed shoe sole manufacturing process schematic diagram of an embodiment of the present application;

[0022] Figure 2 is an exploded schematic diagram (main view angle) of a small mold and an injection molding mold frame of an embodiment of the present application;

[0023] Figure 3 is another exploded schematic diagram (side view angle) of a small mold and an injection molding mold frame of an embodiment of the present application;

[0024] Figure 4 is a side view of a color separation plate of an embodiment of the present application;

[0025] Figure 5 is a top view of a color separation plate of an embodiment of the present application.

[0026] The drawing mark explanation: injection molding mold frame 10, first small mold placement position 101, guide groove 102, injection molding upper mold frame 11, injection molding lower mold frame 12, small mold 20, guide limiting edge 201, zigzag surface 202, upper molding plate 21, lower molding plate 22, upper molding concave surface 211, lower molding concave surface 221, double or multi-color shoe sole cold blank 30, foaming molding mold frame 40, second small mold placement position 401, foaming molding upper mold frame 41, foaming molding lower mold frame 42, double or multi-color EVA shoe sole 50, color separation plate 60. DETAILED DESCRIPTION

[0027] Please refer to Figures 1 to 5 The specific flow and structure of the embodiment of the application are shown.

[0028] A double or multi-color foaming shoe sole manufacturing method, which is mainly but not limited to foaming shoe sole, can be used to manufacture double or multi-color, multi-density foaming shoe sole and other similar double or multi-color, multi-density foaming material products.

[0029] Two or more small molds are needed to be prepared for injection molding and foaming molding turnover; the manufacturing method comprises the following steps:

[0030] Step 1: using an injection molding machine to injection mold a double or multi-color EVA shoe sole cold blank;

[0031] A first small mold placement position 11 is reserved in the injection molding frame 10 of the injection molding machine, and the small mold 20 is placed in the first small mold placement position 101 to be positioned; the injection molding frame 10 comprises a matched injection molding upper mold frame 11 and an injection molding lower mold frame 12, wherein the small mold 20 comprises an upper molding plate 21 and a lower molding plate 22, the top of the lower molding plate 22 is concave downward to form a lower molding concave surface 221, the bottom of the upper molding plate 21 is concave upward to form an upper molding concave surface 211, and the lower molding concave surface 221 and the upper molding concave surface 211 form a foaming molding cavity therebetween; the upper and lower stacking surfaces of the upper molding plate 21 and the lower molding plate 22 are designed as zigzag surfaces 202 to achieve upper and lower occlusion positioning, so that when the small mold 20 is placed in the foaming molding machine, the small mold 20 itself has good material positioning effect, the foaming molding is accurate in size, and the boundaries of different color parts are clear. The small mold 20 is injection molded with a double-color or multi-color shoe sole cold blank 30; in step 1, the injection amount is controlled, for example, the injection amount of each color material is strictly set, the single-color cold blank of single injection molding is weighed in real time, and the feedback is fed back to the control system, and the control system corrects the injection amount of the material of another color according to the existing solidified weight of the single-color cold blank. In actual injection molding, the error is small, and if the cumulative maximum error of the amount of two colors is too large, it may affect whether the weight of a single shoe sole meets the standard. In the traditional technology, a pile of accessories need to be repeatedly selected until the total weight of the accessories meets the standard. In the present application, intelligent monitoring and correction are realized in the injection molding link, so that the weight of the double-color or multi-color shoe sole cold blank 30 meets the standard, and therefore, the weight does not need to be weighed and matched as in the traditional technology.

[0032] Step 2, using a foaming molding machine to foaming mold a double-color or multi-color EVA shoe sole;

[0033] A second small mold placement position 401 is reserved in the foaming molding frame 40 of the foaming molding machine, and the foaming molding frame 40 comprises a foaming molding upper mold frame 41 and a foaming molding lower mold frame 42. The small mold 20 of step 2 is taken out of the injection molding frame 10, and the small mold 20 and the double-color or multi-color shoe sole cold blank 30 in the small mold 20 are positioned in the second small mold placement position 401, and the foaming molding machine is heated to foaming mold the double-color or multi-color shoe sole cold blank in the small mold 20 into a double-color or multi-color EVA shoe sole 50;

[0034] Step 3, the small mold 20 is taken out of the second small mold placement position 401, cooled, opened, and the double-color or multi-color EVA shoe sole 50 is taken out; the empty small mold 20 is recycled to step 1.

[0035] The foaming forming machine has a plurality of second small mold placing positions 401 reserved in the foaming forming mold frame 40. The plurality of small molds 20 are placed in the corresponding second small mold placing positions 401. The same foaming forming machine can foaming form a plurality of double-color or multi-color EVA soles at one time, which is suitable for batch production and greatly improves the foaming forming efficiency. A plurality of cavities arranged in upper and lower layers or left and right side by side can be arranged in the foaming forming mold frame 40 as the second small mold placing positions 401, which are similar to drawer positions. When used, the small mold 20 can be placed in the corresponding cavity, for example, pushed from the operating side to the front. After foaming is completed, the door of the foaming forming machine is opened, and the small mold 20 is pulled out. The small mold 20 can be stacked elsewhere for cooling, and the finished product is taken out later. The foaming forming machine can continue to be used, and the next batch of small molds 20 is pushed in for warming and foaming forming. The mold cooling time of the foaming forming machine in the prior art is saved. At the same time, the heat of the foaming forming machine is not wasted, and the energy waste caused by repeated heating and cooling in the prior art is improved. The small mold 20 can be configured in several ways to facilitate batch production of soles. The small mold 20 has the functions of the mold core of the injection forming machine and the mold core of the foaming forming machine, and also serves as a product turnover carrier in the entire process, ensuring that the product is positioned and protected by the small mold 20 throughout the entire process, which is beneficial to ensuring the stability and consistency of the quality of the sole production. At the same time, the small mold 20 is designed in a square shape, which is convenient for stacking and placing whether it is temporary storage in the production process or idle storage. The operation of transferring and moving is simple and convenient. In the injection forming mold frame 10 of the injection forming machine and the foaming forming mold frame 40 of the foaming forming machine, the push-in and pull-out methods can be used, and the bottom of the small mold 20 and / or the top of the small mold 20, that is, the bottom periphery of the lower forming plate 22 and / or the top periphery of the upper forming plate 21, such as the left and right end extending guide limiting edge 201, are matched with the corresponding guide groove 102 provided in the first small mold placing position 101 and the second small mold placing position 401, which improves the operation convenience of the push-in and pull-out methods and makes the small mold 20 reliably positioned in the first small mold placing position 101 and the second small mold placing position 401.

[0036] Generally, the outer periphery of the small mold 20 can be constant to match the first small mold placing position 101 and the second small mold placing position 401. A foaming forming cavity for a pair of soles can be arranged in each small mold 20. The sizes or shapes of the foaming forming cavities of different small molds 20 are different, so that the small molds 20 can be replaced to meet the production of different soles. Therefore, for different soles, the entire production equipment (including the injection forming machine, the foaming forming machine, etc.) basically does not need to be changed, and only small molds 20 with different foaming forming cavities need to be prepared (that is, the lower forming concave surface 221 and the upper forming concave surface 211 of the small mold 20 are changed).

[0037] Further, a color separation plate 60 can be prepared and selectively arranged between the upper forming plate 21 and the lower forming plate 22 to meet the color separation requirement when the double or multi-color EVA shoe sole cold blank is injection molded.

[0038] In summary, the design of the present application focuses on using small molds as carriers to obtain double or multi-color EVA shoe sole cold blanks through double or multi-color injection molding, and then putting the small molds into a foaming molding machine for direct heating and foaming molding, which effectively solves the problems of color overflow and color mixing, saves the cooling standby time of the foaming molding machine, and eliminates the need for manual weighing, weight distribution, and placement of multiple unfoamed EVA shoe sole blanks. This method is suitable for batch production and greatly improves the production yield and efficiency.

[0039] The above description is only a preferred embodiment of the present application, and does not limit the technical scope of the present application. Any minor modification, equivalent change, and modification made according to the technical essence of the present application to the above embodiment still falls within the scope of the technical solution of the present application.

Claims

1. A method of making a two- or multi-color foamed product, characterized by: Preparation of two or more small block-shaped molds for ejection molding and foaming molding turnover; the manufacturing method comprises the following steps: Step 1: using an injection molding machine to injection mold a double or multi-color product cold blank; A first small mold placement position is reserved in the injection molding mold frame of the injection molding machine, and the first small mold placement position is provided with a first guide groove; the left and right ends of the small mold extend guide limiting edges matched with the first guide groove, and the small mold is pushed into the first small mold placement position to be positioned; wherein the small mold comprises an upper molding plate and a lower molding plate, the top of the lower molding plate is concave downward to form a lower molding concave surface, the bottom of the upper molding plate is concave upward to form an upper molding concave surface, and the lower molding concave surface and the upper molding concave surface form a foaming molding cavity; a double or multi-color cold blank is injection molded in the small mold; in the injection molding link, the injection amount of each color material is set, the single-color cold blank injection molded at a time is weighed in real time, and the weight is fed back to the control system; according to the existing solidification weight of the single-color cold blank, the injection amount of the material of another color is corrected, so as to ensure that the weight of the double or multi-color cold blank injection molded meets the standard; Step 2: using a foaming molding machine to foaming mold a double or multi-color product; A plurality of drawer type cavities arranged in upper and lower layers and left and right sides in the foaming molding mold frame of the foaming molding machine are reserved as second small mold placement positions, and the second small mold placement positions are provided with second guide grooves matched with the guide limiting edges; the small mold of step 2 is pulled out from the injection molding mold frame, and the small mold and the double or multi-color cold blank in the small mold are pushed into the second small mold placement position to be positioned; the foaming molding machine is heated to make the double or multi-color cold blank in the small mold foaming molded into a double or multi-color product; Step 3: the small mold is pulled out from the second small mold placement position and placed elsewhere to wait for cooling, while the next batch of small molds taken out from the injection molding mold frame and the double or multi-color cold blanks in the small molds are put into the foaming molding machine to perform step 2; after cooling, the small mold is opened, and the double or multi-color product is taken out; at the same time, the empty small mold is recycled to step 1.

2. A process for making a two or more color foamed product according to claim 1, characterized in that: The outer periphery of the small mold matches the first small mold placement position and the second small mold placement position, and the foaming molding cavities of different small molds are different, so that the small mold is replaced to meet the production of different products.

3. A process for making a two or more color foamed product according to claim 1, characterized in that: The upper and lower stacking surfaces of the upper molding plate and the lower molding plate are designed as zigzag surfaces to achieve upper and lower engagement positioning.

4. A process for making a two or more color foamed product according to claim 1, characterized in that: A color separation plate is also prepared, which can be selectively arranged between the upper molding plate and the lower molding plate.

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