阅读说明：本技术 一种电视机下前壳及其制备方法 (Lower front shell of television and preparation method thereof ) 是由 栗磊 梁坤 高雷 周映 李方方 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种电视机下前壳及其制备方法,所述下前壳为“L”形,包括膜片、基体和缓冲部,所述膜片与基体的一面贴合,所述缓冲部与基体通过嵌共挤连接为一体,缓冲部表面高于基体表面。本申请的制备方法减少了工艺复杂程度,制程不良率低,避开工艺风险系数高的工艺步骤,并且实现了连续的自动化生产。(The invention discloses a lower front shell of a television and a preparation method thereof, wherein the lower front shell is L-shaped and comprises a membrane, a base body and a buffering part, the membrane is attached to one surface of the base body, the buffering part and the base body are connected into a whole through embedding and co-extrusion, and the surface of the buffering part is higher than the surface of the base body. The preparation method reduces the process complexity, has low process reject ratio, avoids the process steps with high process risk coefficient, and realizes continuous automatic production.)

1. The utility model provides a shell before TV set is down which characterized in that, the shell is "L" shape before down, includes diaphragm (1), base member (2) and buffering portion (3), the one side laminating of diaphragm (1) and base member (2), buffering portion (3) and base member (2) are connected as an organic whole through inlaying crowded altogether, and buffering portion (3) surface is higher than base member (2) surface.

2. The lower front television shell according to claim 1, wherein the substrate (2) is ABS plastic or PP plastic.

3. The lower front cover according to claim 2, wherein when the base body (2) is ABS plastic, the cushioning portion (3) is thermoplastic polyurethane elastomer rubber or thermoplastic elastomer; when the base body (2) is PP plastic, the buffer part (3) is thermoplastic vulcanized rubber or thermoplastic elastomer.

4. The lower front cover according to claim 1, wherein the buffer (3) is 0.4-1mm higher than the surface of the base body (2).

5. A method of manufacturing a television lower front shell as claimed in any one of claims 1 to 4, comprising the steps of:

(1) co-extruding the membrane (1) and the matrix (2) by using a co-extrusion die, wherein the matrix (2) is provided with a buffer slot to obtain a coated matrix;

(2) shaping and cooling the coated substrate;

(3) and extruding the buffering part material to a position between the buffering groove and the forming die by using an extruder B, and embedding and co-extruding the buffering part material for forming.

6. The method for preparing the lower front shell of a television set according to claim 5, wherein the film sheet (1) and the base material are dried before being fed into the extruder A.

7. The method for manufacturing a lower front shell of a television set according to claim 6, wherein after drying, the film sheet (1) is drawn into an extruder A by a film guiding machine, and the matrix material is fed into the extruder A.

8. The process for the preparation of the lower front shell of a television set according to claim 7, characterized in that the film sheet (1) is not melted inside the extruder A.

9. The method for preparing the lower front shell of the television set as claimed in claim 5, wherein the temperature of the insert co-extrusion mold in the step (3) is 170 ℃.

10. The method for manufacturing a lower front shell of a television set according to claim 5, wherein in the step (3), the film-coated substrate obtained in the step (2) is fixed in a forming mold, and pressure is applied to a joint area of the film-coated substrate and the forming mold.

Technical Field

The invention belongs to the technical field of television part forming, and relates to a lower front shell of a television and a preparation method thereof.

Technical Field

With the development of the television, the structure and the process of the forming member thereof are diversified, and the lower front shell of the television is a paradigm of the diversification of the structure and the forming. The extrusion molding is one of the lower front shells. The cross section of the screen is approximately L-shaped and right-angled, one of the inner surfaces is in direct contact with the screen, and the other surface is engaged with the machine body through a buckle and then fixed through screws. In order to prevent the screen from being in hard contact with the lower front shell, the conventional 3M foam adhesive is usually used as a buffer material to be directly adhered to the contact surface, so that the problem of screen contact can be solved. Because need paste 3M bubble celloidin department in the shell before down and be long and thin linear type structure, when the manual work is pasted, there is the deviation slightly in one end, can be enlargied by the multiploid at the other end, very easily cause the substandard product, its attached efficiency and raw and other materials cost just also increase substantially thereupon to receive the adhesive force influence, the assembly probably leads to unable achievement theoretical effect owing to bubble cotton adhesive tape dislocation, causes anti-worker or defective products rate to rise, this problem can directly influence rectification journey technology complexity and improved quality management and control risk coefficient.

At the moment, a co-extrusion process (soft and hard co-extrusion, the attachment of the 3M foam adhesive tape is replaced by soft materials, the buffering effect of the soft material is theoretically superior to that of the 3M foam adhesive tape, and the soft material cannot be dislocated) is used for replacing the 3M foam adhesive tape to form a more appropriate solution, but after the verification in various aspects including structural optimization, raw materials and the like, the extrusion of a finished product by the soft and hard co-extrusion effect which meets the forming precision requirement of the lower front shell can not be basically completed.

Disclosure of Invention

The invention aims to provide a lower front shell of a television and a preparation method thereof, and aims to solve the problems that the lower front shell of the television in the prior version is complicated in manufacturing process, and the reject ratio and the process risk coefficient of the process are high. The preparation method reduces the process complexity, has low process reject ratio, avoids the process steps with high process risk coefficient, and realizes continuous automatic production. In order to achieve the above purpose, the invention provides the following technical scheme:

the utility model provides a shell before TV set is down, shell before down is "L" shape, includes diaphragm, base member and buffering portion, the diaphragm is laminated with the one side of base member, buffering portion and base member are as an organic whole through inlaying crowded connection altogether, and buffering portion surface is higher than the base member surface.

Preferably, the substrate is ABS plastic or PP plastic.

Preferably, when the substrate is ABS plastic, the buffer part is thermoplastic polyurethane elastomer rubber or thermoplastic elastomer; when the substrate is PP plastic, the buffer part is thermoplastic vulcanized rubber or thermoplastic elastomer.

Preferably, the buffer part is higher than the surface of the substrate by 0.4-1 mm.

In addition, the invention also provides a method for preparing the television lower front shell, which comprises the following steps:

(1) co-extruding the membrane and the matrix by using a co-extrusion die, wherein the matrix is provided with a buffer groove to obtain a coated matrix;

(2) shaping and cooling the coated substrate;

(3) and extruding the buffering part material to a position between the buffering groove and the forming die by using an extruder B, and embedding and co-extruding the buffering part material for forming.

Preferably, the film and matrix material are dried before being fed into extruder a.

Preferably, after drying, the film sheet is drawn into the extruder a by a film guide, and the matrix material is fed into the extruder a.

Preferably, the film sheet is not melted in the extruder a.

Preferably, the temperature of the insert co-extrusion mold in the step (3) is 170 ℃.

Preferably, in the step (3), the coated substrate obtained in the step (2) is fixed in a forming die, and pressure is applied to a bonding area between the coated substrate and the forming die.

The invention has the beneficial effects that:

1. the base member carries out "inlay with the buffering portion and crowd altogether", and the effect is similar to the integrated into one piece, and its bonding strength is far higher than the later stage is attached to part precision can obtain the guarantee.

2. Compared with later-stage attachment, the embedding co-extrusion technology realizes process automation, shortens process steps, and realizes process simplification and high efficiency.

3. The cost is reduced, and the material cost, the working procedure and the labor cost are reduced by using TPU (thermoplastic polyurethane elastomer rubber), TPE (thermoplastic elastomer) and TPV (thermoplastic vulcanized rubber) to replace the foam rubber belt.

4. The process can realize co-extrusion of one or two films, and realize color diversification according to different requirements.

5. Compared with single material molding of an injection molding process, the embedded co-extrusion can realize the co-extrusion molding of two materials with different materials and different hardness.

Drawings

Fig. 1 is a schematic cross-sectional view of a lower front housing of a television set according to the present invention.

Fig. 2 is a partially enlarged schematic view of a portion a of fig. 1.

In the figure: 1-a membrane; 2-a substrate; and 3, a buffer part.

Detailed Description

Example 1

As shown in figure 1, the lower front shell of the television comprises a lower front shell which is L-shaped and comprises a membrane 1, a base body 2 and a buffering part 3, wherein the membrane 1 is attached to one surface of the base body 2, the buffering part 3 is connected with the base body 2 into a whole through embedding and co-extrusion, and the surface of the buffering part 3 is higher than that of the base body 2.

Preferably, the cushioning portion 3 is a thermoplastic polyurethane elastomer rubber (TPU).

Preferably, the substrate 2 is ABS plastic.

Preferably, the buffer part 3 is 0.4-1mm higher than the surface of the substrate 2, and the embodiment is preferably 0.7 mm.

In addition, the invention also provides a method for preparing the television lower front shell, which comprises the following steps:

(1) and (3) drying the raw materials of the diaphragm 1 and the substrate 2 before feeding the raw materials into an extruder A, drawing the diaphragm 1 into the extruder A through a film guide machine after drying, and feeding the raw materials of the substrate 2 into the extruder A. And preheating an extrusion screw barrel and a die, and in order to ensure proper die pressing and uniform melting of ABS granules, setting the temperature of the whole extrusion area to be 170 ℃ in the middle area, 165 ℃ at a die orifice and 155 ℃ at a feed orifice, and maintaining the temperature for 15 minutes. Co-extruding the membrane 1 and the matrix 2 by using a co-extrusion die, wherein the matrix 2 is provided with a buffer groove to obtain a coated matrix, and the membrane 1 is not melted but directly attached to the surface of the matrix in a co-extrusion manner in the co-extrusion process;

(2) shaping and cooling the coated substrate, wherein the cooling mode is vacuumizing and water cooling, and air drying after cooling;

(3) and (3) fixing the coated substrate obtained in the step (2) into a forming die, applying pressure of 30N to a bonding area of the coated substrate and the forming die, extruding a buffer part material to a position between the buffer groove and the forming die by using an extruder B, and embedding and co-extruding the buffer part material for forming. The temperature of the embedding co-extrusion die is 170 ℃.

Example 2

Buffer 3 is thermoplastic elastomer (TPE), and base member 2 is PP plastics, and buffer 3 thickness is 0.4 mm.

The rest is the same as example 1.

Example 3

The buffer part 3 is thermoplastic vulcanizate (TPV), and the substrate 2 is PP plastic. The thickness of the cushioning portion 3 is 1 mm.

The rest is the same as example 1.

Example 4

The buffer part 3 is thermoplastic elastomer (TPE), and the substrate 2 is ABS plastic. The thickness of the cushioning portion 3 is 0.8 mm.

Control group

The contrast group is prepared by manually sticking 3M foam cotton glue in a buffer groove of the substrate 2 according to the prior art, and the thickness of the 3M foam cotton glue is 1 mm.

The performance test, the defective rate test and the production efficiency comparison were performed on the tv lower front cases prepared according to examples 1, 2 and 3, wherein the performance test on the tv lower front case was mainly performed on the adhesion of the buffer part 3 and the base 2, and the test and comparison results are as follows in table 1:

TABLE 1

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.