TWM626308U - Shaping mold for molding flip-flops - Google Patents

Abstract

The main technical feature of the molding mold for flip-flops provided by this creation is that when the polymer raw material is injected into the mold chamber space of the mold, the injected raw material is preferentially used for molding The space direction of the shoe ear area of the herringbone shoe ear part of the flip-flops flows in the direction of space, so as to ensure that the elongated herringbone shoe ear part of the flip-flops can be completely formed.

Description

Molding mold for flip flops

This creation is related to shoe-making technology, especially a mould for moulding flip-flops.

The structure of flip-flops includes a sole and a herringbone-shaped slender strip-shaped shoe ear, and due to the slender structure of the shoe ear, the conventional technology of manufacturing using polymer materials as raw materials is difficult to perform in a single time. In the molding process, the ear is integrally formed on the sole, resulting in the need to adopt different manufacturing processes. After the sole and the ear are respectively made, the two are assembled to complete the finished flip-flops through processing.

Therefore, the main purpose of this creation is to provide a molding method for flip-flops, which is to use polymer materials as raw materials to integrally shape the narrow and long strip-shaped herringbone shoe ears of the flip-flops on the sole through a mold. , eliminating the assembly process of secondary processing.

The reason is that, in order to achieve the above purpose, the main technical feature of the molding method of flip-flops provided by this creation is that when the polymer raw material is injected into the mold chamber space of the mold, the injected The raw material preferentially flows in the direction of the space of the shoe ear area used for molding the herringbone shoe ear part of the flip-flop, so as to ensure that the slender herringbone shoe ear part of the flip-flop is completely formed.

In order to realize the above-mentioned method, the present creation also provides a molding die for flip-flops, which includes a first die and a second die for forming a multi-piece die body, a die formed by the first die. A mold chamber defined by a mold sheet and the second mold sheet in the state of being overlapped and connected to each other, and three feed channels separately provided on the first mold sheet for communicating with the mold chamber, The external macromolecular raw materials can enter the mold chamber through the supply channels, carry out reaction foaming, and be molded into the flip-flops by the mold chamber.

In order to mold the required flip-flops, the mold room is divided into a sole area with the shape of the flip-flop bottom, a shoe ear area with the elongated herringbone-shaped shoe ears of the flip-flops, and communicated respectively. The sole area and the shoe ear area correspond to the three end points of the herringbone and are three connection areas in the shape of holes, and the discharge orifices of the injection channels located on the wall of the mold chamber are directed toward the connections respectively. Where the area is located, whereby the polymer raw materials that are pushed by external forces from the outside can enter the mold chamber through each of the discharge orifices, the polymer raw materials entering the mold chamber can be caused by the above-mentioned relative positions. The polymer material can be accumulated in the connecting areas or its adjacent areas first, so that the polymer material can smoothly enter the space of the shoe ear area, so that the space of the shoe ear area can be filled with the polymer material accordingly.

On the other hand, the upward opening method can also be assisted by the technology of back-pressure foam molding, that is, the molding mold of the flip-flop in the closed state is to be reversed before the polymer raw material is injected. Pressurized gas is poured into the mold chamber, so that the mold chamber is filled with gas with a predetermined pressure value, and then the above-mentioned polymer raw material injection procedure is performed, and after the rated amount of polymer raw material is injected, the polymer When the raw material is to be foamed, the back pressure gas is discharged out of the mold, and the foaming is completed while the back pressure disappears.

Wherein, the molding die of the flip-flop further includes at least one gas channel that can be opened and closed as a flow channel for the back pressure gas to enter and exit the mold chamber.

Further, the number of the air passages can be set to be the majority, and be divided into the first group communicated with the sole area, and the second group communicated with the shoe ear area, whereby the mold of the flip-flops is When discharging the back pressure gas in the molding method, the back pressure gas located in the shoe ear area can be discharged first through the second set of gas channels, so that the gas back pressure value in the shoe ear area can be reduced or reached. The degree of vacuum, so that the difference in back pressure between the sole area and the shoe ear area can be passed through, so that the polymer material located in the sole area with a higher pressure value is located in the lower pressure value. The space of the shoe ear area is shifted, so as to ensure that the polymer raw material can fill the shoe ear area, and then all the back pressure gas still remaining in the mold chamber is exhausted to make foaming.

Please refer to FIG. 1 , a preferred embodiment of the present invention provides a molding method (10) for flip-flops, which is used to manufacture flip-flops (20) as shown in FIG. 2 , and is carried out by a molding die (30) of flip-flops as shown in FIG. 3 .

Please refer to FIG. 3 and FIG. 4 , the molding mold (30) of the flip-flop is a multi-layer mold, and includes a first mold (31) and a second mold with appropriate thicknesses (32), a mold chamber (33) defined by the first mold sheet (31) and the second mold sheet (32), and five hole-shaped injection channels (34).

The first die (31) and the second die (32) can be in a clamping position as shown in FIG. 3, which are superimposed and connected to each other, and can be separated and spaced apart from each other under the application of external force. A relative displacement between a mold opening position, and the first mold piece (31) and the second mold piece (32) located on the mold closing position jointly define a closed shape between them. The mold chamber (33).

The mold chamber (33) has the same spatial shape as the flip-flops (20) shown in FIG. 2, so that it is divided into the first mold (31) corresponding to the shape of the flip-flop sole (21). ) and a shoe sole area (331) between the second die (32), corresponding to the shoe ear (332) of the thin and long strip of flip-flops and located in the second die (32) area (332), and corresponding to the three end positions of the shoe ear area (332) herringbone shape and its middle part, and located on the second die (32) to communicate with the sole area (331) and be in the shape of a hole The fifth connection area (333).

Wherein, in order to facilitate the taking out of the molded product, the second mold piece (32) for defining the shoe ear region (332) can be composed of a mold body (321) and a mold core (322), but only The technical content of setting the core inside the mold is the technical content of common knowledge, and it is not the technical feature of this creation, so it will not be repeated here, but anyone with ordinary knowledge in the technical field of this creation can refer to The general knowledge at the time of this author's application can easily accomplish the mold configuration used to define the mold chamber.

Each of the injection passages (34) is separately arranged on the first die (31), and a discharge orifice (341) is formed on the chamber wall of the die chamber (33) respectively, so as to communicate with the die. The chambers (33) are communicated with each other, and each of the discharge orifices (341) is directed to the respective locations of the respective connection regions (333);

Further, each of the discharge orifices (341) extends along the virtual discharge area (a) of its own hole in the direction of the mold chamber (33), and each of the corresponding connection areas is along its own hole The virtual connection area (b) extending in the direction of the sole area (331), respectively, forms an intersection within the space range of the sole area (331), and the range of the intersection can be further expanded to as shown in FIG. 3 General coaxial overlap state.

The molding method (10) of the flip-flops implemented by the above-mentioned molding die (30) of the flip-flops includes the following steps:

Step A, take the molding die (30) of the flip-flops.

Step B: As shown in Figure 3(A), the molding die (30) of the flip-flop is located at the clamping position.

Step C. The rated amount of polymer raw material is pushed by the force exerted by the outside, and the single injection inlet (342) located on the top side of the first die (31) is collected through each of the injection channels (34) ) into each of the injection channels (34) respectively, and then into the mold chamber (33) through each of the discharge orifices (341) respectively, and through the above-mentioned each of the discharge orifices (341) and each of the The relative position of the connection area (333), the polymer raw material can be concentrated at and around the connection area (333) as shown in FIG. 3(B) at the beginning of entering the mold chamber (33), so that The polymer raw material entering the mold chamber (33) flows in the direction of the shoe ear region (332) through the connecting regions (333) before filling the sole region (331), so as to preferentially flow to the shoe ear region (332). The space of the shoe ear area (332) is filled, and the polymer material that cannot be filled into the shoe ear area (332) is filled in the sole area (331), so as to complete the rated amount of polymer material as shown in Figure 3(C) injection. Among them, the technical means used to inject the polymer raw material into the mold chamber can be a conventional injection device, but these injection techniques are generally known to those of ordinary knowledge in the technical field to which this creation belongs. The basic technical content used is not the technical feature of this creation, so it will not be repeated here.

Step D. After the polymer raw material to be injected is foamed in the mold chamber (33) and molded as shown in Figure 3(D), the flip-flops can be molded into a mold (30) Open to the mold opening position as shown in Figure 3(E), so as to take out the finished flip-flops (20).

Thereby, the molding method (10) of the flip-flops can ensure that the flip-flops with narrow and long strip-shaped herringbone ears and block-shaped soles can be integrally molded into a finished product in a single molding, The lack of separate manufacturing and additional assembly processing in the prior art is avoided, and the quality of the formed flip-flops can be ensured.

In addition, there are two things that need to be explained.

First, in the molding method (10) of the flip-flops and the molding die (30) of the flip-flops, although each of the discharge openings (341) and each of the connection areas are exposed (333) is the best state of coaxiality, but its industrial application is not limited to it, only the guiding effect of the discharge orifices (341) for the injected polymer raw material can be The result is that the polymer raw material is adjacent to each of the connecting regions (333) when entering the mold chamber (33), so that the injected polymer raw material can preferentially enter the shoe ear region, which belongs to the present creation. The range covered by the technical characteristics.

Second, the molding method (10) of the flip-flops can be assisted by the technical means of back pressure forming, but the specific content of the back pressure forming technology is already disclosed in the prior art, Therefore, only the part related to the technical features of this creation will be explained later.

As shown in Fig. 5, in order to form a back pressure in the mold chamber (33), the mold (30) needs to have a plurality of gas passages (35) that can be used as gas flow passages, and make these gas passages (35) It is divided into a first group (35a) communicated with the sole region (331), and a second group (35b) communicated with the shoe ear region (332), and the opening and closing system of each gas channel (35) can be The only thing that is controlled is the control technology for opening and closing the channel, which is a well-known technology, and will not be repeated here.

Using the mold as shown in FIG. 5 , the method (10) for molding the flip-flops can be performed by pouring back pressure gas into the mold chamber through each of the gas channels (35) before the step C is performed. In (33), the pressure formed by the gas injected into the mold chamber (33) is used to create a back pressure for the polymer raw material that enters the mold chamber (33) subsequently, so as to prevent it from developing during injection. Bubble.

The back pressure is continuously maintained until the foaming in step D, that is, while the polymer raw material in step D is foaming, the back pressure gas causing back pressure is simultaneously discharged from the mold chamber (33 ), the polymer raw material can be foamed while the back pressure disappears.

Among them, the discharge of the back pressure gas, in addition to the method of discharging all at one time as described above, can also use the method of discharging in stages.

In the method of expelling back pressure gas in stages, the gas passages of the second group (35b) are first opened, the back pressure gas located in the shoe ear area (332) is discharged first, and then the back pressure gas located in the sole area (331) is discharged first. ) of the back pressure gas, due to the time difference of discharge, the difference in pressure value is generated between the sole area (331) and the shoe ear area (332), and then by the equal pressure difference, the polymer raw material is removed from the sole. The area (331) is pushed to the shoe ear area (332) to ensure that the polymer raw material can fill the entire space of the shoe ear area (332), so as to maintain the good quality of the finished product. Wherein, in the step of discharging the back-pressure gas from the shoe ear area in the first stage, the range of the pressure reduction is not limited to the degree of vacuum that is completely discharged. Even if there is still some back-pressure gas remaining, it is still enough to form the above The pressure difference is achieved to ensure the integrity of the shoe ear after molding.

(10): Molding method of flip-flops (20): Flip-flops (21): Sole (22): shoe ears (30): Molding mold for flip-flops (31): first die (32): Second die (321): Mold body (322):Mold core (33): Mold room (331): Sole area (332):Shoe ear area (333): Connection area (34): Injection channel (341): Discharge orifice (342): Injection inlet (35): Gas channel (35a): The first group of gas channels (35b): The second group of gas channels (a): Virtual discharge area (b): Virtual connection area

FIG. 1 is a schematic flowchart of a preferred embodiment of the present invention. FIG. 2 is a three-dimensional view of flip-flops made according to a preferred example of the present invention. FIG. 3 is a cross-sectional view of a mold according to a preferred embodiment of the present invention. FIG. 4 is a schematic top view of a mold of a preferred example of the present invention. FIG. 5 is a schematic cross-sectional view showing the gas channel provided in the mold according to a preferred embodiment of the present invention.

(30): Molding mold for flip-flops

(31): first die

(32): Second die

(321): Mold body

(322):Mold core

(33): Mold room

(331): Sole area

(332):Shoe ear area

(333): Connection area

(34): Injection channel

(341): Discharge orifice

(342): Injection inlet

(a): Virtual discharge area

(b): Virtual connection area

Claims (10)

A molding die for flip-flops, comprising: A first die and a second die can be displaced relative to each other under the action of external force between a mold-closing position that is attached to each other and a mold-opening position that is spaced apart from each other; A mold chamber is a closed space between the first mold and the second mold defined by the first mold and the second mold when they are located at the mold clamping position, the mold The chamber also has a space shape with the same shape as the flip-flops, and is divided into a sole area corresponding to the sole of the flip-flops, a shoe ear area corresponding to the long-striped herringbone ears of the flip-flops, and respectively Connecting the sole region and the shoe ear region corresponding to the three connection regions in the hole shape of the three end positions of the herringbone; Three hole-shaped feeding channels are respectively set on the first die and communicate with the die chamber, so that external raw materials can enter the die chamber through the feeding channels, and make the feeding The channels are located at the discharge orifices on the wall of the mold chamber, which are respectively oriented to where the connection areas are located. The molding mold for flip-flops as claimed in claim 1, wherein the shoe ear area of the mold chamber is located on the second mold sheet; and the supply channels are located on the first mold sheet. The molding die for flip-flops according to claim 1, wherein the discharging orifices are respectively connected to the corresponding virtual discharging areas extending along their own hole axes toward the mold chamber. The virtual connection areas extending toward the mold chamber respectively form a virtual intersection within the mold chamber. The molding die for flip-flops according to claim 3, wherein the virtual extension line of the hole axis of each of the discharge openings passes through each of the corresponding connection areas. The molding die for flip-flops according to claim 1, further comprising at least one controllable opening and closing gas channel, which is provided on the first die and/or the second die to communicate with The mold chamber and the exterior. The molding die for flip-flops as claimed in claim 1 is used for the following methods: Step A: Take the molding die of the flip-flops; Step B: make the molding die of the flip-flops at the clamping position; Step C: inject a rated amount of polymer raw material into the mold chamber from the outside through the supply channels, and make the injected polymer raw material through the relative positions of the discharge orifices and the connection sections. At the position where the connection areas are located or adjacent to it, the polymer raw material is first accumulated in the space of the mold chamber adjacent to the connection areas, so that the polymer material is first in the space of the shoe ear area. to fill; Step D: After the injected polymer raw material is reacted and foamed in the mold chamber, the molding mold of the flip-flop is opened and the finished flip-flop is taken out. The molding die for flip-flops according to claim 6, wherein, before the step C is performed, a back pressure gas is filled in the mold chamber to form a back pressure in the mold chamber, and when the When foaming the polymer raw material in the step D, all the backpressure gas is simultaneously discharged out of the mold chamber to remove the backpressure in the mold chamber, so that the foaming can be performed synchronously. The molding die for flip-flops according to claim 7, wherein the back pressure gas discharge performed in the step D is to discharge the back pressure gas located in the shoe ear area first, and by accumulating in the The polymer raw material around the orifices of the connection area blocks the back pressure gas in the sole area from entering the shoe ear area, so as to reduce the back pressure value of the shoe ear area or reduce it to a vacuum, so as to make the shoe ear area The pressure value of the shoe sole area is smaller than the counter pressure value of the sole area, and the polymer raw material is forced to flow from the sole area to the elongated space of the shoe ear area by the pressure difference therebetween, and completely fills the shoe ear After the space is cleared, the gas in the sole area is exhausted, so that the counter-pressure gas is completely exhausted out of the mold chamber. The molding die for flip-flops according to claim 6, 7 or 8, wherein the polymer raw material contains a foaming agent. The molding die for flip-flops according to claim 9, wherein the foaming agent is a supercritical fluid.

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