阅读说明：本技术 一种壳体及其制备方法 (Shell and preparation method thereof ) 是由 张望 李博 于 2019-10-25 设计创作，主要内容包括：本发明公开了一种壳体及其制备方法,包括骨架层和弹性体包胶层,所述弹性体包胶层包覆在所述骨架层表面,所述弹性体包胶层的包胶厚度不均匀,应用本发明实施例的壳体由于弹性体包胶层的厚度不均匀,壳体整体外观优良、饱满,增强了抗摔等级,有效地保护壳体内部零件；通过本发明实施例的制备方法成型的壳体无注塑不良现象。(The invention discloses a shell and a preparation method thereof, wherein the shell comprises a framework layer and an elastomer encapsulating layer, the elastomer encapsulating layer is coated on the surface of the framework layer, the encapsulating thickness of the elastomer encapsulating layer is uneven, and the shell applying the embodiment of the invention has the advantages that the overall appearance of the shell is excellent and full due to the uneven thickness of the elastomer encapsulating layer, the anti-falling grade is enhanced, and parts in the shell are effectively protected; the shell formed by the preparation method provided by the embodiment of the invention has no bad injection molding phenomenon.)

1. The shell is characterized by comprising a framework layer and an elastomer encapsulating layer, wherein the elastomer encapsulating layer is coated on the surface of the framework layer, and the encapsulating thickness of the elastomer encapsulating layer is uneven.

2. The case of claim 1, wherein the carcass layer is a PC carcass layer and the elastomer encapsulating layer is a TPU encapsulating layer.

3. The housing of claim 1, wherein the elastomer overmold has a thickness in the range of 0.5-4 mm.

4. The shell according to any one of claims 1 to 3, wherein the skeleton layer comprises a hollow-out portion, and the elastomer coating layer covers the surface of the hollow-out portion.

5. A method of making a housing, comprising:

forming an elastomer rubber coating layer on the surface of the framework layer;

wherein the encapsulation thickness of the elastomer encapsulating layer is not uniform.

6. The method according to claim 5, wherein forming the elastomer encapsulating layer on the surface of the skeleton layer comprises:

forming the framework layer by primary injection molding;

and cooling the framework layer, and then molding the elastomer rubber coating layer on the surface of the framework layer through secondary injection molding.

7. The method according to claim 5, wherein forming the elastomer encapsulating layer on the surface of the skeleton layer comprises:

forming the framework layer with a hollow part through first injection molding by using a first mold;

forming the elastomer rubber coating layer on the surface of the framework layer by second injection molding by using a second mold; wherein, the elastomer rubber coating covers the surface of the hollow part.

8. The method of manufacturing according to claim 6, wherein the carcass layer is a PC carcass layer, and the first injection molding of the carcass layer comprises:

drying the PC raw material;

the injection molding parameters comprise the nozzle temperature of 280-320 ℃, the mold temperature of 60-140 ℃, the temperature of the front part of the charging barrel of 270-320 ℃, the temperature of the middle part of the charging barrel of 260-300 ℃ and the temperature of the rear part of the charging barrel of 250-290 ℃, and the framework layer is molded by injection molding.

9. The preparation method of claim 5, wherein the elastomer encapsulating layer is a TPU encapsulating layer, and the elastomer encapsulating layer is formed on the surface of the framework layer through second injection molding, and comprises the following steps:

adding the dried TPU raw material into an injection molding machine drying tower, wherein the temperature of the drying tower is 100-;

setting injection molding parameters including a nozzle temperature of 180-.

10. The method of manufacturing according to claim 5, further comprising:

spraying paint on the surface of the elastomer encapsulation layer to form a paint spraying layer;

and carrying out laser etching treatment on the surface of the paint spraying layer to form a laser etching layer.

Technical Field

The invention relates to the field of high polymer materials, in particular to a shell and a preparation method thereof.

Background

The shell is a physical structure and mainly plays a role in supporting, bearing, connecting and protecting parts of equipment, such as a motor, a transmission mechanism, a switch, a handle, other accessory devices and the like, so that the shell becomes a complete entity. The shell is usually the outermost structure of the complete entity, and serves to protect the entity. At present, plastic shells, aluminum profile shells, sheet metal shells, stainless steel shells and the like are available in the market. The plastic shell is low in manufacturing cost, easy to be molded into different shapes, wide in application range, and continuous in research and development of various plastic shells, and the encapsulation is a process for encapsulating a soft rubber material onto other materials.

Disclosure of Invention

The embodiment of the invention provides a shell and a preparation method thereof, which can play a better protection role.

The invention provides a shell which comprises a framework layer and an elastomer encapsulating layer, wherein the elastomer encapsulating layer is coated on the surface of the framework layer, and the encapsulating thickness of the elastomer encapsulating layer is not uniform.

In one embodiment, the skeleton layer is a PC skeleton layer, and the elastomer encapsulating layer is a TPU encapsulating layer.

In one embodiment, the elastomer encapsulating layer has a thickness in the range of 0.5 to 4 mm.

In an embodiment, the skeleton layer includes a hollow portion, and the elastomer wrapping layer covers a surface of the hollow portion.

In another aspect, the present invention provides a method for manufacturing a housing, including: forming an elastomer rubber coating layer on the surface of the framework layer; wherein the encapsulation thickness of the elastomer encapsulating layer is not uniform.

In one embodiment, the forming of the elastomer encapsulating layer on the surface of the skeleton layer includes: forming the framework layer by primary injection molding; and cooling the framework layer, and then molding the elastomer rubber coating layer on the surface of the framework layer through secondary injection molding.

In one embodiment, the forming of the elastomer encapsulating layer on the surface of the skeleton layer includes: forming the framework layer with a hollow part through first injection molding by using a first mold; forming the elastomer rubber coating layer on the surface of the framework layer by second injection molding by using a second mold; wherein, the elastomer rubber coating covers the surface of the hollow part.

In an embodiment, the skeleton layer is a PC skeleton layer, and the first injection molding of the skeleton layer includes: drying the PC raw material; the injection molding parameters comprise the nozzle temperature of 280-320 ℃, the mold temperature of 60-140 ℃, the temperature of the front part of the charging barrel of 270-320 ℃, the temperature of the middle part of the charging barrel of 260-300 ℃ and the temperature of the rear part of the charging barrel of 250-290 ℃, and the framework layer is molded by injection molding.

In an embodiment, the elastomer rubber coating is a TPU rubber coating, and the elastomer rubber coating is formed on the surface of the skeleton layer by a second injection molding, and includes: adding the dried TPU raw material into an injection molding machine drying tower, wherein the temperature of the drying tower is 100-; setting injection molding parameters including a nozzle temperature of 180-.

In an embodiment, the method further comprises: spraying paint on the surface of the elastomer encapsulation layer to form a paint spraying layer; and carrying out laser etching treatment on the surface of the paint spraying layer to form a laser etching layer.

The shell provided by the invention has the advantages that the thickness of the elastomer encapsulating layer is uneven, the whole appearance of the shell is excellent and full, the falling resistance grade is enhanced, and the internal parts of the shell are effectively protected. The shell formed by the preparation method provided by the embodiment of the invention has no bad injection molding phenomenon.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

FIG. 1 is a schematic cross-sectional view of a housing according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of another housing according to an embodiment of the invention.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention provides a shell, which comprises a framework layer and an elastomer encapsulating layer, wherein the elastomer encapsulating layer is coated on the surface of the framework layer, and the encapsulating thickness of the elastomer encapsulating layer is not uniform.

The shell provided by the embodiment of the invention is suitable for shells, containers and parts of mechanical equipment. The mechanical equipment can be detection equipment, handheld terminal, outdoor equipment, indoor equipment or any other equipment with a shell, such as a detector, a mobile phone, a computer, a keyboard, a mouse, a television, a motor and the like. The container can be a box, a basket, a box and the like, and the parts can be rubber bolts, rubber screws, drawer handles and the like. The shell designated by the embodiment of the invention can be a complete shell which is integrally formed, and can also be one part of the shell, such as a box body, a cover plate, a hinge and the like.

Through the inhomogeneous elastomer rubber coating of thickness, can make the outward appearance of casing more pleasing to the eye, have the effect of protection casing ply simultaneously, further, when the casing was as mechanical equipment's shell or container, the casing can also play the guard action to the inside built-in thing of casing, has strengthened anti grade of falling, effectual protection instrument internals. Due to the fact that the thickness of the elastomer encapsulating layer is uneven, the shell can be designed to be good and full in overall appearance through the thickness of the elastomer encapsulating layer, and the shell is particularly suitable for mechanical equipment or containers in irregular shapes, such as pear shapes. Further, the housing provided by the embodiment of the present invention may be a transparent housing, and may also be a non-transparent housing.

In the embodiment of the present invention, the skeleton layer is a Polycarbonate (PC) skeleton layer, and the elastomer encapsulating layer is a Thermoplastic polyurethane elastomer (TPU) encapsulating layer.

The skeleton layer may be any formable thermosetting plastic or thermoplastic plastic, such as Polyethylene (PE) skeleton, Polycarbonate (PC) skeleton, polyvinyl chloride (PVC) skeleton, polypropylene (PP) skeleton, Polyethylene terephthalate (PET) skeleton, nylon (Polyamide) skeleton, Acrylonitrile-butadiene-Styrene copolymer (ABS) skeleton, etc., according to the requirement. According to the requirement of the framework material, various plastic alloys or modified plastics can be selected, such as PC/ABS alloy and the like. The carcass layer is preferably made of a hard plastic, such as PC plastic, which has good compatibility with the elastomer encapsulating layer. By selecting the hard plastic with good compatibility with the elastomer encapsulating layer, the joint surface between the framework layer and the elastomer encapsulating layer can be firmer, and the rubber coating has good hand feeling and rubber coating stability. The Elastomer encapsulating layer may be any one of TPU, Thermoplastic Elastomer (TPE), and Thermoplastic rubber (TPR), and is preferably a TPU Elastomer. TPU types which are compatible with the materials of the framework layer, such as Bayer US-60A, are preferred, if desired. And according to the needs, the TPU material with any of the characteristics of ultraviolet resistance, high strength, soft protection and excellent temperature resistance can be preferably selected to be made into the elastomer rubber coating layer, so that the shell is particularly suitable for protecting mechanical equipment placed in the external environment, the characteristics of ultraviolet resistance, impact resistance and excellent temperature resistance are realized, the scrappage of the shell of the equipment is delayed, and the internal parts of the equipment are protected. Furthermore, the TPU material with the temperature range of-40-85 ℃ is preferably used. It should be further noted that the hardness of the elastomer encapsulating layer is less than that of the skeleton layer, and the elastomer encapsulating layer is softer and more elastic than the skeleton layer.

In the embodiments of the present invention, the thickness of the elastomer encapsulating layer is in the range of 0.5 to 4mm, and more preferably 1 to 3.5 mm.

The size range of the integrally molded case is preferably ((90-130) × (90-130) × (90-130)) mm according to the process ³. At the point of this thickness, the thickness of the film,the thickness range of the elastomer encapsulating layer is most suitable to be 0.5-4mm, and the shell can have a high forming rate in the thickness range, and is favorable for forming required irregular shapes and protecting internal parts. Further, the hardness of the elastomer encapsulating layer is preferably 80 to 90 degrees, and more preferably 85 degrees. Specifically, the elastomer encapsulating layer with uneven thickness is preferably thicker at the position where the stress of the framework layer is concentrated or easily cracked, and is thinner at the position where the framework layer is stable in structure.

In the embodiment of the invention, the skeleton layer comprises the hollow-out part, and the elastomer rubber coating layer covers the surface of the hollow-out part.

Furthermore, the hollow-out part is a through hole on the framework layer, and according to design requirements, the through hole is formed on the framework layer and used for mounting parts, such as buttons. In the process, the mounting position of the button is formed by hollowing the skeleton layer, the surface of the hollowed part is covered by the elastomer encapsulating layer, so that the button positioned inside the shell is isolated from the outside, the button is protected, and the application range of the shell is widened because rigid plastic does not influence the use of the button.

Another aspect of the embodiments of the present invention provides a method for manufacturing a housing, including: forming an elastomer rubber coating layer on the surface of the framework layer; wherein, the encapsulation thickness of the elastomer encapsulating layer is not uniform.

According to the process provided by the embodiment of the invention, the elastomer encapsulating layer with uneven encapsulating thickness can enable the appearance of the shell to be more attractive, and meanwhile, the shell has the function of protecting the framework layer, and further, when the shell is used as a shell or a container of mechanical equipment, the shell can also play a role of protecting the built-in objects in the shell, so that the anti-falling grade is enhanced, and the internal parts of the instrument are effectively protected. Due to the fact that the thickness of the elastomer encapsulating layer is uneven, the shell can be designed to be good and full in overall appearance through the thickness of the elastomer encapsulating layer, and the shell is particularly suitable for mechanical equipment or containers in irregular shapes, such as pear shapes. Further, the housing provided by the embodiment of the present invention may be a transparent housing, and may also be a non-transparent housing. And the elastomer rubber coating layer is formed on the surface of the framework layer, so that the elastomer rubber coating layer is integrally formed, and the composite material is more attractive, better in protection effect and excellent in anti-falling grade.

In the embodiment of the invention, the forming of the elastomer encapsulating layer on the surface of the framework layer comprises the following steps: firstly, forming a framework layer through primary injection molding; and then, cooling the framework layer, and molding the elastomer rubber coating layer on the surface of the framework layer through secondary injection molding.

In the preparation method of the embodiment of the invention, the shell is subjected to primary injection molding of the framework layer, and the elastomer rubber coating layer is subjected to secondary injection molding on the framework layer. The second injection molding needs to be carried out after the framework layer is cooled, so that the framework layer can be prevented from deforming in the cooling process, and the problems that the overall size of the shell does not reach the standard, glue overflows, the rubber coating effect is poor and the like due to the deformation of the framework layer are avoided. The combination of the elastomer rubber coating layer and the framework layer is more compact. It should be noted that the specific temperature for cooling herein refers to a temperature range in which the used frame layer material is not deformed due to temperature, and may also refer to a room temperature range, such as 10-40 ℃. Further, the cooling method is not limited, and air cooling, water cooling, natural cooling, and the like may be employed.

In the embodiment of the invention, the forming of the elastomer encapsulating layer on the surface of the framework layer comprises the following steps: firstly, a framework layer with a hollow part is formed by a first injection molding by a first mold; then, forming an elastomer rubber coating layer on the surface of the framework layer by secondary injection molding by using a second mold; wherein, the elastomer rubber coating covers the surface of the hollow part.

The first die is used for forming the hollow-out part, after the hollow-out part is formed on the framework layer, the framework layer is transferred to the second die, and the elastomer rubber coating layer covering the surface of the hollow-out part is formed through the matching of the second die and the framework layer. The hollow-out part is formed by the first mold, the elastomer encapsulating layer is formed by the second mold and the framework layer in a matching manner by adopting a conventional mold design method, the shape of the mold cavity is specifically designed according to the needs of the shell, and the mold is not specifically described here. Through cooling and transferring of the framework layer, the framework layer can be well matched with the second die, and therefore the forming rate of the shell is guaranteed.

In the embodiment of the present invention, the skeleton layer is a PC skeleton layer, and the skeleton layer is formed by a first injection molding, including: firstly, drying a PC raw material; then, setting the injection molding parameters including the nozzle temperature of 280-320 ℃, the mold temperature of 60-140 ℃, the front temperature of 270-320 ℃, the middle temperature of 260-300 ℃ and the rear temperature of 250-290 ℃ to mold the framework layer by injection molding.

According to the framework layer obtained by the PC injection molding process, the deformation after molding can be controlled to be +/-0.1 mm, the framework layer after molding is favorably matched with the second mold, and the rejection rate of the framework layer is reduced. Specifically, the drying temperature of the PC part is 100-.

In the embodiment of the invention, the elastomer rubber coating layer is a TPU rubber coating layer, and the elastomer rubber coating layer is formed on the surface of the framework layer through the second injection molding, and comprises the following steps: adding the dried TPU raw material into an injection molding machine drying tower, wherein the temperature of the drying tower is 100-; the injection molding parameters comprise the nozzle temperature of 180-.

Under the process parameters, the TPU material can be well combined with the PC, the rubber coating effect is improved, the TPU rubber coating layer is firmly combined on the surface of the PC framework layer, the rubber coating effect with uneven thickness required by design can be presented according to requirements, the falling resistance grade is enhanced, the internal parts of the instrument are effectively protected, the whole TPU rubber coating layer is free of whitish or opaque color blocks, and the injection molding effect is excellent. Furthermore, through debugging, the initial injection pressure of 100-120MPa, the injection speed of 25-30 percent and the pressure maintaining time of 35-50S can be set. To improve the stability of the process. Further, before the TPU material is subjected to injection molding, drying treatment can be carried out, the TPU raw material is put into a drying oven, the temperature is adjusted to 100 ℃, and the drying is carried out for 2-4 hours, so that the water in the material is evaporated. To improve the stability of the process.

In an embodiment of the present invention, after the housing is molded, the method further comprises: firstly, performing spray painting treatment on the surface of an elastomer encapsulation layer to form a spray paint layer; and then carrying out laser etching treatment on the surface of the paint spraying layer to form a laser etching layer.

Through spraying paint and radium carving processing, can form colour and sign at the casing surface as required according to the design to further improve the aesthetic property of casing.

To facilitate a further understanding of the above-described implementation, several specific examples are provided below.