CN100355548C - Method for bonding plastic parts and plastic products prepared by the method - Google Patents

Abstract

The invention relates to a method for bonding a plastic piece, which bonds a plastic piece and a plastic carrier, wherein the plastic piece is integrally bonded with the plastic carrier by a method of injection molding into a 4-type plastic piece, and the method comprises the following steps: 1) placing the plastic sheet into a mold cavity for molding a plastic carrier; 2) injecting the melted plastic base material into the mold cavity for injection molding to adhere the plastic sheet and the plastic carrier into a whole; 3) and (5) cooling and demolding. In the injection molding process, the temperature range in the mold cavity is 150-280 ℃, and the injection pressure range is 40-280 MPa. The plastic product prepared by the bonding method of the plastic part comprises a plastic carrier and a plastic sheet covered on the surface of the plastic carrier, wherein the plastic sheet and the plastic carrier are integrally formed by injection molding. Because the plastic sheet is adhered with the plastic carrier into a whole through injection molding, the two plastic pieces can not be separated, and the plastic sheet is durable and beautiful.

Description

Method for bonding plastic parts and plastic products prepared by the method

technical field

The invention relates to the field of daily-use plastic products, in particular to a method for bonding plastic parts and a plastic product prepared by the method.

Background technique

In industrial production, in order to modify or protect the surface of daily-use plastic products, adhesive paper is generally covered on the surface of the plastic product, such as adhesive paper with cartoon patterns on the surface of a ruler, and plastic bottles with manufacturer information and Adhesive paper for advertising patterns, etc. For easy and convenient manufacture, the above-mentioned tape and plastic products are generally bonded by glue, but this glue bonding method has the following disadvantages: after using for a period of time or soaking in water, the adhesive force of the glue will decrease, and the difference between the two The edge of the adhesive tape will warp, which will affect the appearance of the product, and then easily cause the adhesive tape to separate from the plastic product (that is, delamination).

Contents of the invention

The main purpose of the present invention is to provide a method for bonding plastic parts that can firmly connect two plastic parts.

Another main purpose of the present invention is to provide a plastic product that can make the plastic sheet and the plastic carrier adhere firmly and durable

The object of the present invention is achieved like this: the bonding method of this plastic part is that plastic sheet and plastic carrier are bonded, and it comprises the following steps: 1) plastic sheet is put into the mold cavity that is used for molding plastic carrier; 2) The molten plastic base material is injected into the mold cavity for injection molding, so that the plastic sheet and the plastic carrier are adhered together. During the injection molding process, the temperature range in the mold cavity is 150 degrees Celsius to 280 degrees Celsius, and the range of injection pressure is 40 MPa ~ 280 MPa, injection time ranges from 3 seconds to 20 seconds; 3) cooling and demoulding, the plastic carrier covered with plastic sheets can be obtained.

The materials of the plastic sheet and the plastic carrier are selected from the following materials: polypropylene, polyethylene terephthalate, polystyrene, polyurethane and polycarbonate.

The plastic sheet in the method is a multi-layer structure.

The plastic sheet includes a base layer, at least two pattern layers are laid on the upper surface of the base layer in sequence, and a light-transmitting layer is laid on the surface of the uppermost pattern layer, and convex lines are arranged on the light-transmitting layer.

A plastic product prepared by the bonding method.

Compared with the prior art, the present invention has the following advantages: because the plastic sheet is integrally adhered to the plastic carrier through injection molding, the two plastic parts will not separate from each other, and are durable and beautiful.

Description of drawings

Fig. 1 is the schematic structural view of the plastic product prepared by the bonding method of the plastic part of the present invention.

Fig. 2 is a process flow diagram of the bonding method of plastic parts of the present invention.

Fig. 3 is a partial enlarged view of the place indicated by P in Fig. 1 .

Detailed ways

Please refer to FIG. 1 and FIG. 2 together. The bonding method of the plastic parts of the present invention is to bond the plastic carrier 1 and the plastic sheet 2 into one body by injection molding. The plastic sheet 2 can be a grating sheet or plastic paper, and the plastic carrier 1 can be a stationery (such as a ruler) or a daily necessities (such as a plastic teacup), and the carrier is formed by an injection molding process in a mold cavity by molten plastic base material. The specific steps of the bonding method of the plastic parts are as follows: 1) Make the plastic sheet 2 (grating sheet or plastic paper); 2) Put the plastic sheet 2 into the injection mold cavity, and the injection mold cavity is used for forming The mold cavity of the plastic carrier 1; 3) under a certain temperature and pressure, inject molten plastic base material into the mold cavity, and then injection molding, during this process, the molten plastic base material contacts the surface of the plastic sheet 2 and stick together; 4) cooling and stripping, the plastic carrier 1 covered with the plastic sheet 2 can be obtained.

During the above injection molding process, the temperature in the mold cavity is between 150 degrees Celsius and 280 degrees Celsius, the injection pressure is between 40 MPa and 200 MPa, the injection time is between 3 seconds and 20 seconds, and the cooling time Between 4 seconds and 20 seconds. The material of the plastic sheet 2 and the plastic carrier 1 is selected from the following materials: PP (polypropylene) material, PET (polyethylene terephthalate) material, PS (polystyrene) material, PU (polyurethane) material or Plastic materials such as PC (polycarbonate) materials. For the plastic carrier 1, the required temperature and injection pressure in the mold cavity vary with the wall thickness of the plastic carrier 1. Generally, the larger the wall thickness, the greater the required temperature and pressure. When the volume of the plastic carrier 1 is larger, the injection time increases correspondingly, and the temperature and pressure required for molding also increase. For the plastic sheet 2, the greater the thickness, the longer the injection time, and the higher the temperature and pressure required for injection molding. The wall thickness of the plastic carrier 1 is related to the thickness of the plastic sheet 2 to be adhered. The ratio of the wall thickness of the plastic carrier 1 to the thickness of the plastic sheet 2 depends on the degree of adhesion required without separation between the two. , such as when the thickness of the plastic sheet 2 to be bonded is 0.5 mm, the thickness of the plastic carrier 1 is 1.5 mm.

The plastic product prepared by the above method of bonding plastic parts includes a plastic carrier 1 and a plastic sheet 2 covering the surface of the plastic carrier 1 , and the plastic sheet 2 and the plastic carrier 1 are integrally formed by injection molding.

Please refer to FIG. 3 , which shows that the plastic sheet 2 with the pattern changing effect and the plastic carrier 1 are made into a three-dimensional painting cup. In this embodiment, the plastic sheet 2 is a grating sheet, and its thickness is between 0.3 mm and 0.4 mm. The plastic sheet 2 is a multi-layer structure, which includes a base layer 21, at least two pattern layers 22 are successively laid on the upper surface of the base layer 21, and a light-transmitting layer 23 is laid on the surface of the uppermost pattern layer 22. The light-transmitting layer 23 Several convex strips 231 are arranged on the surface, and the pattern is changed through the refraction and reflection of each convex strip 231 . The plastic carrier 1 is a plastic cup made of PP material, and the wall thickness of the plastic cup is between 1 mm and 1.5 mm. The manufacturing process of the three-dimensional painting cup is as follows: 1) make a grating sheet, and the length of the grating sheet is slightly larger than the circumference of the outer ring of the plastic cup; 2) put the grating sheet into the injection mold cavity for forming the plastic cup; 3) Under a certain temperature and pressure, inject molten PP plastic base material into the mold cavity, and through injection molding, the plastic sheet and the plastic cup are adhered together. During the production process of the three-dimensional painting cup, the mold cavity The temperature is between 220 degrees Celsius and 230 degrees Celsius, the injection pressure is between 70 MPa and 95 MPa, and the injection time is 4 seconds to 6 seconds; 4) cooling and demoulding, the three-dimensional painting cup can be obtained, The cooling time is approximately 4 seconds to 6 seconds.

Because the plastic sheet 2 is integrally adhered to the plastic carrier 1 through injection molding, the two plastic parts 1 and 2 will not separate from each other, and are durable and beautiful.

Claims (5)

1. A bonding method for plastic parts, which is to bond a plastic sheet to a plastic carrier, characterized in that: it includes the following Steps: 1) Put the plastic sheet into the mold cavity used to form the plastic carrier; 2) Inject the molten plastic base material into the mold cavity for injection molding, so that the plastic sheet and the plastic carrier are adhered together, during the injection molding process , the temperature range in the mold cavity is 150 degrees Celsius to 280 degrees Celsius, the injection pressure ranges from 40 MPa to 280 MPa, and the injection time ranges from 3 seconds to 20 seconds; 3) cooling and demoulding, you can get A plastic carrier covered with a plastic sheet. 2. The bonding method of plastic parts as claimed in claim 1, characterized in that: the material of the plastic sheet and the plastic carrier is selected from the following materials: polypropylene, polyethylene terephthalate, polystyrene Vinyl, polyurethane and polycarbonate. 3. The bonding method of plastic parts according to claim 2, characterized in that: the plastic sheet in the method is a multi-layer structure. 4. The bonding method of plastic parts as claimed in claim 3, characterized in that: the plastic sheet comprises a base layer, the upper surface of the base layer is successively laid with at least two layers of pattern layers, and the surface of the uppermost pattern layer is laid with The light-transmitting layer is provided with raised lines. 5. A plastic product prepared by the bonding method according to claim 1.

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