JPH0337989B2 - - Google Patents

Abstract

PURPOSE:To produce a molding with low cost by forming a molding body with resin mainly composed of polyolefin then applying plasma treatment onto the rear face of said body. CONSTITUTION:Molding body 1 is formed with synthetic resin mainly composed of polyolefin. Then plasma treatment is applied at least onto the rear face 2 of molding body 1. Consequently the rear face 2 is provided with adhesion performance of adhesives, paint, film, etc. so adhesives is applied or double side adhesive tape is stuck onto the rear face 2 to form an adhesives layer 4. Such molding is fixed by pressure applying said layer 4 onto the fixing face of chassis.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing synthetic resin moldings for decoration and protection of vehicles and the like.

Synthetic resin moldings such as synthetic resin extrusion moldings and injection moldings are used as decorative and protective moldings such as automobile body side moldings and bumper moldings. Fig. 1 is a perspective view showing this type of molding, Fig. 2 is a cross-sectional view taken along line A-A, Fig. 3 is a cross-sectional view taken along line A-A of another molding, and Fig. 4 is a cross-sectional view taken along line A-A of another molding. FIG.

In the drawings, reference numeral 1 denotes a molding body, which is molded in a long shape from synthetic resin and has a back surface 2 corresponding to a mounting surface (not shown) of a vehicle body and an outer surface 3 having a desired shape. The back surface 2 has a shape that can be attached to the mounting surface of the vehicle body, and both are adhesive and
An adhesive material layer 4 such as double-sided adhesive tape is formed. The outer surface 3 serves as a decorative and protective surface and is formed into a desired shape. In FIG. 2, the synthetic resin surface is exposed, and in FIG. In the figure, a decorative film 5 such as characters is partially formed by thermal transfer.

The traditional manufacturing method for this type of molding is
A molding body 1 is formed by molding polyvinyl chloride resin, polyester resin, etc. into a predetermined shape by extrusion molding, injection molding, etc., and then applying an adhesive or pasting double-sided adhesive tape to the back surface 2. , an adhesive material layer 4 is formed, and a decorative film 5 is formed on the outer surface by painting, thermal transfer, printing, vapor deposition, sputtering, etc., if necessary.

However, in such conventional molding manufacturing methods, in order to form the adhesive material layer 4 and the decorative film 5, it is necessary to use a synthetic resin that has excellent adhesion with other materials, which increases the cost. This has the disadvantage that it is expensive and cannot use inexpensive polyolefin resins. In addition, when forming a decorative film on the outer surface and an adhesive material layer on the back surface, these are different types of processing, so
The disadvantage was that it was difficult to select materials suitable for both treatments.

This invention was made by focusing on the drawbacks of such conventional products, and the molding body is formed from a resin mainly based on polyolefin,
The purpose of the present invention is to solve the above-mentioned problems by spraying a plasma jet made from air into plasma while rotating the molding body in a vacuum chamber to perform plasma treatment on the outer and back surfaces.

This invention includes a step of molding a molding body having a back surface corresponding to the mounting surface of the vehicle body and a desired outer surface shape using a synthetic resin mainly composed of polyolefin, and rotating the molding body within a vacuum chamber. , a process of applying plasma treatment to the outer and back surfaces of the molding body by injecting a plasma jet made from air, and a process of forming a decorative film on the plasma-treated outer surface. forming an adhesive material layer on the back surface of the molding.

The present invention will be explained below based on the drawings. The molding produced in this invention is shown in FIGS. 3 and 4. Of course other shapes,
The production of structural moldings is also possible. Fifth
The figure is a conceptual diagram showing the state of plasma processing.

In the method of manufacturing the molding, first, the molding body 1 is molded by injection molding, extrusion molding, etc. using a synthetic resin mainly composed of polyolefin. In this case, the back surface 2 of the molding body 1 has a shape corresponding to the mounting surface of the vehicle body, and the outer surface 3 has a desired shape. In the example shown in FIG. 3, the outer surface 3 is arcuate, but in the example shown in FIG. 4, the portion on which the decorative film 5 such as letters and patterns is to be transferred is projected in a raised manner.

Synthetic resins mainly based on polyolefins are
It is mainly composed of a polyolefin resin such as a polyethylene resin or a polypropylene resin, and may contain other resin components, and may also contain a rubber such as ethylene propylene rubber or a filler such as talc.

Next, the outer surface 3 and back surface 2 of the molding body 1 are subjected to plasma treatment using a plasma jet made by turning air into plasma. When forming the decorative film 5 on the outer surface 3 of the molding body 1,
It is preferable to perform plasma treatment on the entire surface. Plasma treatment using a plasma jet that turns air into plasma refers to plasma treatment using a plasma jet in which electrons and cations coexist due to the ionization of air.
The surface treatment is carried out by spraying the spray onto the surface to be treated, and is carried out using an apparatus as shown in FIG.

In FIG. 5, reference numeral 6 denotes a vacuum chamber, and a plasma jet generator 8 is provided so that a plasma jet 7 can be injected into the chamber. The molding body 1 is attached to a hanger (not shown) provided in a vacuum chamber 6 and rotates, and is subjected to plasma treatment by spraying from a plasma jet 7.

There are no particular restrictions on the plasma jet generator 8, and any commonly used one used for surface treatment of resins can be used, such as a microwave plasma jet generator, a high frequency plasma jet generator, a corona discharge plasma jet generator, etc. Et generator etc. can be used. The microwave plasma jet generator sends air at a rate of approximately 1000 c.c./min and irradiates it with microwaves with a power of approximately 1.4 kW and a frequency of approximately 2450 MHz to generate a plasma jet. The treatment is carried out by spraying the plasma jet 7 for about 1 minute at a vacuum degree of 0.5 to 1 Torr. The high frequency plasma jet generator uses high frequency waves instead of microwaves, with a power of approximately 200W and a frequency of approximately 13.56M.
Hz, vacuum degree of 0.1 to 0.5 Torr, and processing time of about 5 minutes. The corona discharge plasma jet generator generates a plasma jet 7 by corona discharge.

The molding body 1 whose surface has been modified by plasma treatment has been given adhesive properties such as adhesives, paints, films, etc., so it is taken out from the vacuum chamber 6 and coated with adhesive material layer 4 and decorative material. Film 5
form.

The adhesive material layer 4 is formed in the same manner as in the conventional method, and is carried out in any of the cases shown in FIGS. 2 to 4. That is, since at least the back surface 2 of the molding body 1 is subjected to plasma treatment,
Adhesiveness is high, and an adhesive material layer 4 is formed by applying an adhesive or pasting a double-sided adhesive tape to the plasma-treated back surface 2.

The decorative film 5 is formed on the plasma-treated outer surface 3 and the like. This treatment is preferably carried out prior to the formation of the adhesive material layer 4. For example, in the case of FIG. 3, the outer surface 3 is coated with a polyurethane paint or the like to form a decorative film 5 on the entire outer surface 3. In the case of FIG. 4, a decorative coating 5 such as letters and patterns is partially formed by transferring onto the protruding portion of the outer surface 3 using a hot stamp or the like. In addition, conventional methods such as printing, vapor deposition, sputtering, and cured film treatment can be used to form the decorative film 5.

As the decorative film 5, the molding body 1
It may be a decorative film that is formed on a part or the entire surface of the outer surface 3, and may be distinguishable. Furthermore, such as a siloxane-based hard coat film, those having protective properties as well as those having decorative properties are also included in this category.

The molding manufactured as described above is used by attaching the adhesive material layer 4 to the mounting surface of the vehicle body by pressing it, and exposing the decorative surface on the outer surface 3 side.

As explained above, according to this invention,
The structure is such that the molding body is molded from a resin mainly made of polyolefin, and while the molding body is rotated in a vacuum chamber, a plasma jet made by turning air into plasma is injected to generate plasma on the outer and back surfaces. Because of this process, the molding is manufactured using inexpensive materials with poor film adhesion, and both sides are uniformly plasma treated to form different types of adhesive material layers and decorative films in separate processes. Moreover, since these materials are lightweight, it is possible to reduce the weight of the vehicle body, and the overall cost can be reduced. Furthermore, since air existing in the atmosphere is used as the gas for plasma generation, no equipment is required for gas generation, and the cost of the equipment used can be reduced.

In this case, since plasma gas is injected and the molding body is rotated within the vacuum chamber, both the front and back surfaces of the molding body are uniformly plasma-treated. Therefore, there is no locally weak adhesion of the decorative film or weak adhesion of the adhesive material layer, and a product with stable quality can be obtained. Plasma treatment also makes both the front and back sides of the molding body hydrophilic, making it possible to form a decorative film on the outer surface with just one type of plasma treatment, without the need for multiple different treatments. Since it can be commonly applied as a pretreatment and a pretreatment for forming an adhesive material layer, the manufacturing process can be simplified and facilitated.

Furthermore, plasma treatment improves the color tone of the surface of the treated object.
Since the gloss does not change before and after the treatment, even if a decorative film is formed on a part of the surface, the parts other than where the film was formed will maintain their original color and luster, and will not match the original color of the molding itself. It can also be easily applied to applications where a unique decorative coating is desired. In general, the duration of the treatment effect of plasma treatment is considerably longer than that of solvent treatment, so the process of forming a decorative film on the outer surface as in the present invention,
Even if there is a lapse of time between this process and the process of forming the adhesive material layer, which is a different process, the adhesive force of the adhesive material layer to the back surface of the molding body will remain the same as the initial adhesive force. can get. Therefore, time restrictions on process control are relaxed. This is particularly advantageous for those on which a decorative film is formed by painting, baking, etc., and has a remarkable effect.

Next, embodiments of this invention will be described.

EXAMPLE A molding body 1 was molded by injection molding using a resin mainly composed of polyethylene resin and polypropylene resin, and the entire surface was subjected to plasma treatment using a microwave plasma jet generator. The conditions for plasma treatment are vacuum degree 0.5 Torr,
Power source microwave 2450MHz, 1.4kW, processing gas air, gas flow rate 1000c.c./min, processing time 1min. Thereafter, a polyurethane paint is applied to the entire surface of the outer surface 3 to form a decorative film 5, and then the back surface 2 is coated with polyurethane paint.
A double-sided adhesive tape for polyvinyl chloride resin was applied to the adhesive layer 4 to form an adhesive layer 4.

The adhesion strength of the decorative film 5 of the molding is primary adhesion, moisture resistance (50°C x 1000h), hot water resistance (40°C x 1000h), heat cycle resistance (80°C x 4h),
-30°C x 4h, 4 cycles), the coating film peeling strength was 600g/cm or more. Furthermore, the shear strength of the adhesive material layer 4 was 4000 g/cm or more, and both exhibited sufficient adhesion as exterior molding for automobiles.

From the above results, it can be seen that the manufacturing method of the present invention can manufacture a fully usable vehicle molding using polyolefin-based synthetic resin.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a molding, FIG. 2 is a cross-sectional view taken along the line A-A, FIG. 3 is a cross-sectional view taken along line A-A of another molding, and FIG. 4 is a perspective view of yet another molding. FIG. 5 is a conceptual diagram showing the state of plasma processing. In each figure, the same reference numerals indicate the same or equivalent parts, 1 is the molding body, 2 is the back surface, 3 is the outer surface, 4 is the adhesive material layer, 5 is the decorative coating, 6 is the vacuum chamber, 7 is the plasma Jet 8 is a plasma jet generator.

Claims (1)

[Claims] 1. A step of molding a molding body having a back surface corresponding to the mounting surface of the vehicle body and a desired outer surface shape from a synthetic resin mainly composed of polyolefin, and molding the molding body in a vacuum chamber. The process is the same as the process of applying plasma treatment to the outer and back surfaces of the molding body by rotating the molding body and spraying a plasma jet made by turning the air into plasma, and the process of forming a decorative film on the plasma-treated outer surface. A method for manufacturing a molding, comprising the step of forming an adhesive material layer on a back surface that has been subjected to plasma treatment. 2. The method for manufacturing a molding according to claim 1, wherein the adhesive material layer is an adhesive layer or a double-sided adhesive tape. 3. The method for manufacturing a molding according to claim 1 or 2, wherein the decorative film is formed by painting, thermal transfer, printing, vapor deposition, sputtering, or cured film treatment.