Preparation process of special-shaped plastic product

Abstract

The invention discloses a preparation process of a special-shaped plastic product. The preparation process comprises the following steps: (1) preparing a printed special-shaped plastic printed product; (2) preparing a printed special-shaped plastic printed product, and carrying out plastic molding to obtain a molded printed product; (3) uniformly smearing or spraying a colloidal or liquid fusion agent on the back surface of the formed printed product formed in the step (2), and drying to obtain the printed product for later use; and (4) putting the printed product with the cured colloidal or liquid fusion agent into an injection mold cavity, and then injecting high-temperature PP (polypropylene) melt glue for injection molding to obtain the product. According to the invention, the pattern is not easy to wear, is not easy to fall off, distort and deform, and is more beneficial to meeting the use requirements of users.

Description

Technical Field

[0001] The invention relates to the technical field of plastic products, and in particular to a preparation process of special-shaped plastic products. Background Art

[0002] With the leapfrog development and progress of my country's packaging and printing industry, with the increasingly accelerated pace of life, plastic sheet packaging with high convenience has also rapidly emerged. The packaging boxes or plastic products made by plastic processing are highly waterproof, light and easy to carry, with more printing styles and beautiful appearance, making the overall packaging effect excellent and attracting consumers. At present, there are existing processes for printing patterns on flat and regular plastic surfaces that can achieve waterproof, scratch-resistant and non-detachable properties, such as screen printing, UV printing (UV printing process mainly refers to the use of special UV inks on UV printers to achieve local or overall UV printing effects, which is mainly suitable for printing non-absorbent materials) and film-in-film lamination processes. However, for the current special-shaped plastic products (such as flying saucer balls, plastic flower balls, plastic special-shaped strips and PVC special-shaped materials, etc., which are widely used in the automotive industry, electronic appliances, communication equipment, mechanical equipment, packaging supplies and daily consumer goods), the printed patterns on the surface are easily worn, and are also prone to falling off, distortion and deformation. Therefore, it is necessary to improve the existing technology to address this defect. Summary of the invention

[0003] 1. Technical issues that need to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a process for preparing special-shaped plastic products, which makes the pattern less likely to be worn, fall off, distorted and deformed, and is more conducive to meeting the user's usage needs.

[0005] (II) Technical solutions that need to be adopted

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A process for preparing a special-shaped plastic product comprises the following steps:

[0008] (1) Prepare printed special-shaped plastic printed materials;

[0009] (2) preparing the printed special-shaped plastic printed matter for vacuum forming to obtain a shaped printed product;

[0010] (3) applying or spraying a gelatinous or liquid fusion agent evenly on the back of the printed product formed in step (2), and obtaining a printed product after drying, which is then ready for use;

[0011] (4) Place the printed product with the solidified gel or liquid fusion agent into the injection mold cavity, and then inject high-temperature PP melt to form the product.

[0012] Preferably, based on step (1), the special-shaped plastic printed product is made of PVC or PET sheet, and the thickness of the special-shaped plastic printed product is 0.1 mm to 0.4 mm.

[0013] Preferably, in step (3), the drying is preferably carried out by natural drying for 24 hours.

[0014] Preferably, the gel-like or liquid fusing agent may be a plastic adhesive.

[0015] Preferably, in step (4), the high temperature of the PP melt is 170°C to 250°C.

[0016] (III) Technical effects to be achieved

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] First, the present invention (1) prepares printed special-shaped plastic printed products; (2) prepares the printed special-shaped plastic printed products for vacuum forming to obtain molded printed products; (3) uniformly applies or sprays a gel or liquid fusion agent on the back of the molded printed products formed in step (2), and obtains a printed product after drying, and the printed product is ready for use; (4) places the printed product with the solidified gel or liquid fusion agent into an injection molding mold cavity, and then injects a high-temperature PP melt to perform injection molding to obtain a product. This method is simple in steps and is convenient for implementation.

[0019] Secondly, the present invention uses a gel-like or liquid fusion agent and PP melt as a medium to achieve permanent fusion of two different materials in different forms. This method is beneficial for making the surface pattern after production not easily damaged and waterproof, and also has physical properties such as corrosion resistance, which can better meet the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a block diagram of the present invention.

[0021] Figure 2 This is the infrared test spectrum of the original sample of the gel or liquid fusion agent of the present invention.

[0022] Figure 3 This is the infrared test spectrum of the dried sample of the colloidal or liquid fusion agent of the present invention.

[0023] Figure 4 It is a schematic diagram of a sample of the gel or liquid fusion agent of the present invention. DETAILED DESCRIPTION

[0024] In the description of the present invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0025] In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invention product is usually placed when in use, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0028] Example 1: See Figure 1 , a process for preparing a special-shaped plastic product, comprising the following steps:

[0029] (1) Prepare printed special-shaped plastic printed materials;

[0030] (2) preparing the printed special-shaped plastic printed matter for vacuum forming to obtain a shaped printed product;

[0031] (3) applying or spraying a gelatinous or liquid fusion agent evenly on the back of the printed product formed in step (2), and obtaining a printed product after drying, which is then ready for use;

[0032] (4) Place the printed product with the solidified gel or liquid fusion agent into the injection mold cavity, and then inject high-temperature PP melt (PP special plastic glue, PP is polypropylene) for injection molding into the product.

[0033] Embodiment 2: It can be explained on the basis of embodiment 1, and on the basis of step (1), the special-shaped plastic printed matter adopts PVC or PET sheet, and the thickness of the special-shaped plastic printed matter is 0.1mm~0.4mm. This setting is more conducive to meeting the use requirements.

[0034] Embodiment 3: Based on Embodiment 1 or Embodiment 2, it can be explained that in step (3), the drying is preferably carried out by natural drying for 24 hours. This natural drying is conducive to reducing costs, and the drying effect is better, which is conducive to more complete bonding in the later stage. Figure 2 , Figure 3 and Figure 4 As shown, the colloid or liquid fusion agent may be a plastic adhesive (mainly containing styrene-butadiene-styrene block copolymer), wherein the plastic adhesive has a large amount of diluent, and the main component of the diluent is toluene, such as Figure 2 , Figure 3 and Figure 4 As shown, this kind of gel or liquid fusion agent is more conducive to the permanent fusion of two different materials in different forms, so that the surface pattern after production is not easily damaged and waterproof, and also has physical properties such as anti-corrosion, which can better meet the use requirements. For drying, high temperature drying can also be used, which is also conducive to rapid drying.

[0035] Embodiment 4: It can be explained on the basis of embodiment 1 or embodiment 2 or embodiment 3 that the high temperature of the PP melt in step (4) is 170°C to 250°C. The thinner the product is, the smaller the cavity space is, and the higher the sol fluidity requirement is. In this case, a higher temperature is required. The temperature range is 170°C to 250°C for the PP melt. This is conducive to meeting the processing requirements of different products. When the temperature is lower than 170°C, the PP melt cannot be melted from solid particles to a colloidal melt. When the temperature is higher than 250°C, the PP melt is prone to carbonization of the material (commonly known as burning). Therefore, the PP melt is 170°C to 250°C to meet the use requirements.

[0036] The present invention uses a gel-like or liquid fusion agent and PP melt (hot fluid) as a medium to achieve permanent fusion of two different materials in different forms. This method is beneficial for making the surface pattern after production not easily damaged and waterproof, and also has physical properties such as anti-erosion, scratch resistance and not easy to fall off, which can better meet the use requirements.

[0037] It should be noted that, although the above embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the patent of the present invention.

Claims

1. A process for preparing a special-shaped plastic product, characterized in that: The steps include: (1) Prepare printed special-shaped plastic printed materials; (2) preparing the printed special-shaped plastic printed matter for vacuum forming to obtain a shaped printed product; (3) applying or spraying a gelatinous or liquid fusion agent evenly on the back of the printed product formed in step (2), and obtaining a printed product after drying, which is then ready for use; (4) Place the printed product with the solidified gel or liquid fusion agent into the injection mold cavity, and then inject high-temperature PP melt to form the product.

2. The process for preparing a special-shaped plastic product according to claim 1, characterized in that: It is explained on the basis of step (1) that the special-shaped plastic printed product is made of PVC or PET sheet, and the thickness of the special-shaped plastic printed product is 0.1mm-0.4mm.

3. The process for preparing a special-shaped plastic product according to claim 1, characterized in that: In step (3), the drying is preferably carried out by natural drying for 24 hours.

4. The process for preparing a special-shaped plastic product according to claim 1, 2 or 3, characterized in that: The gel-like or liquid fusing agent may be a plastic adhesive.

5. The process for preparing a special-shaped plastic product according to claim 1, characterized in that: In step (4), the high temperature of the PP melt is 170°C to 250°C.

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