JPH059085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for fixing a mirror such as a makeup mirror into a holding frame.

<Conventional technology> Conventionally, bathroom vanities and the like are produced by fixing a mirror on the surface of a molded product formed by thermoforming such as vacuum forming of a plastic sheet using pressure-sensitive tape or mirror fixing metal fittings. It is then completed by attaching accessory parts such as lighting fixtures.

Once a mirror is locked, it is rarely removed.
Therefore, it is important from a safety point of view to maintain the fitted state of the plastic molded product and prevent it from falling off.

<Problems to be Solved by the Invention> However, the conventional method of fixing the back of the mirror and the plastic molded product using double-sided adhesive tape (with a cushion) is susceptible to various factors depending on the purpose of use, such as humidity, temperature, impact, and deformation. to be influenced. As a result, the mirror often falls off due to a decrease in the adhesive strength of the tape or a large load due to the adhesive strength. Also, after production,
During the process of inventory, transportation, construction, etc., the mirror may face the ground and the package may be twisted.
At this time, for example, a situation occurs in which two of the four fixing points that are subjected to a peeling load peel off and fall off.

On the other hand, there is a method of locking both the upper and lower ends of the mirror with stainless steel U-shaped metal fittings, but there have been cases where the mirror has corroded or rusted during long-term use and become damaged, causing the mirror to fall off.

In addition to these post-production problems,
In particular, the manufacturing process is complicated by the need for such a process of separately attaching metal fittings. This requires a separate process of preparing the metal fittings, manufacturing the metal fittings, and attaching the metal fittings, and furthermore, the installation of these metal fittings requires manual labor, so it is possible to automate the manufacturing process and save labor. This is because there were obstacles to this in terms of aspects.

The present invention aims to solve the problems that hinder the simplification and automation of the production process in the manufacture of such cosmetic mirrors.

<Means for Solving the Problems> In view of the above problems, the method according to the first invention of the present application uses a material that can be heat-formed and shrinks when cooled during the process of manufacturing mirrors for cosmetics, etc. A shaping process in which the material is shaped into a holding frame by thermoforming, a cooling process in which the shaped mirror storage frame is cooled from the molding completion temperature, and a stage in the middle of this cooling process when the shrinkage process is completed or in an equilibrium state. This consists of a mirror insertion step of inserting the mirror into the mirror surface receiving portion of the holding frame molded from the above-mentioned material.

The dimensions of the holding frame shaped by this shaping process are such that the mirror can be easily inserted into the holding frame before the contraction is completed or an equilibrium state is reached. When the above-mentioned contraction is completed or an equilibrium state is reached, it is set in advance so that the mirror is contracted to the extent that it does not fall off from the mirror receiving part of the holding frame, and the mirror can be attached to the holding frame at the same time as the forming of the holding frame is completed. It is something that will be completed.

The method according to the second invention of the present application is performed during the process of manufacturing a cosmetic mirror, that is, during the process of forming a mirror holding frame using a material that can be heat-formed and hardens upon cooling. By constructing a part of the mold for molding with a mirror to be held in this holding frame, and forming the mold so that the mirrors are positioned at appropriate intervals during molding so as to be enclosed by the material, After molding, that is, after being given appropriate hardness, the mirror, which was part of the mold, is taken into the holding frame and held, and the mirror is attached to the holding frame at the same time as the forming of the holding frame is completed. is completed.

<Function> The first invention of the present application having the above configuration is capable of holding the mirror in the holding frame by shrinking the holding frame from the process of shaping the holding frame to its completion. Therefore, the installation of the mirror is completed at the same time as the frame of the framed mirror is completed.

Furthermore, in the second invention of the present application having the above configuration, during the shaping process of the holding frame, the mirror itself forms part of the mold and plays a part of the shaping of the holding frame, and the holding frame is As the frame hardens, the mirror is incorporated into this holding frame. Therefore, the installation of the mirror is completed at the same time as the frame of the framed mirror is completed. That is, the shaping process itself also serves as the mirror mounting process.

<Embodiments> Preferred embodiments of the present invention will be described in detail below by way of example with reference to the drawings. However, the dimensions, shapes, materials, relative positions, etc. of the components described in this example are beyond the scope of this invention unless there is a particularly specific memorization (for example, "limited to...", etc.). The present invention is not intended to be limited to these, and is merely an illustrative example.

<<Example of the first claim>> First, to give an overview of the present invention, a mirror is inserted in the process of thermoforming a plastic sheet, and the unique linear expansion coefficient difference between the plastic sheet and the mirror is utilized. This achieves a strong mirror lock. The "material that shrinks when cooled" is at least more than the material that forms the mirror.
Any material may be used as long as it has a large shrinkage rate in the cooling temperature range described below. Therefore, the following will be representatively explained using particularly suitable plastics, but other materials within plastics or materials other than plastics as long as they meet the above requirements. It is included in this application.

To explain the structure in detail, the mirror holding frame is formed by a thermoforming process in which the mirror holding frame is formed using a material that shrinks when cooled at an appropriate molding temperature, and a cooling process in which the mirror holding frame is cooled from the molding temperature. .

During the cooling process and before the contraction is completed or an equilibrium state is reached, a mirror insertion process is set in which the mirror is inserted into the mirror receiving part of the holding frame formed of the material, and the mirror is inserted into the mirror receiving part of the holding frame formed of the material. The holding frame is characterized in that the size of the holding frame is such that it does not fall off from the mirror receiving portion of the holding frame when the contraction is completed or the equilibrium state is reached. Here, the phrase "contraction is completed or an equilibrium state is reached" is used in consideration of the fact that it is often difficult to specify the point at which contraction is completed. This is because even after it appears that the product has completely shrunk, shrinkage may occur due to temperature changes when used as a commercial product. For example, even if shrinkage due to cooling, which is a manufacturing process, is completed at the production stage, further shrinkage may occur if the product is used in a cold place. Therefore, such contraction is considered to be contraction after "reaching an equilibrium state."

The linear expansion coefficient of resin sheets such as high-impact polystyrene, acrylonitrile butadiene styrene, and high-impact vinyl chloride is approximately 7×10 ^-5 cm/cm・℃, but that of glass is 0.8×10 ⁻⁵ cm/cm・℃. It is about 1/9. When a material receives heat, it expands,
This shows that a corresponding shrinkage occurs during cooling.

Taking the case of high-impact vinyl chloride boards, resin boards such as acrylonitrile butadiene styrene, and high-impact polystyrene as a representative example, high-impact vinyl chloride boards can be formed at a molding temperature of 170°C.
~190℃, and the heat distortion temperature is 72℃. Acrylonitrile butadiene styrene molding temperature 180
~190℃, and the heat distortion temperature is 83℃. High impact polystyrene has a molding temperature of 150-180℃ and a heat distortion temperature of 104℃. Not limited to the above examples, plastic sheets generally have a thermoforming temperature of
The temperature is approximately 100-250°C. The temperature at which thermal contraction is completed or reaches an equilibrium state varies depending on each material, but
There is no problem as long as the heat distortion temperature is below the heat distortion temperature listed in the above example (considering plastic sheets in general, there are individual variations, but it is generally below 150°C).

From the above, the cooling temperature range is set from the thermoforming temperature to around the usage temperature (room temperature).

Usually, when a plastic sheet is used, forced cooling in the cooling process is performed by blowing air or spraying mist. The cooling rate varies depending on the individual material, but in the case of plastic sheets, rapid cooling is not preferable, and slow cooling is preferable.

Also, it is not limited to plastic sheets,
Other materials (including composite materials) may be used as long as they have a linear expansion coefficient greater than that of the mirror within the cooling temperature range.

FIG. 1 is a schematic cross-sectional view of a thermoformed plastic sheet. 1 is the molded product body. 2 is an overhang part, and the distance from the center line C is A. 3 is a receiving recess on the mirror periphery. This receiving part 3
The distance from the center line C is B. The side part of main body 1 is 4, and the part corresponding to the back side of main body 1 is 5.
It is. A mirror receiving portion J is constituted by the receiving recess 3 and the back surface corresponding portion 5. The overhang portion 2 referred to herein is a raised portion formed as a barb in order to prevent the mirror received in the mirror receiving portion J from coming off.

When thermoforming a plastic sheet by drape forming, the overhang part 2 is formed so that the difference between the distances A and B is, for example, 2 to 3 mm, and the thickness C of the overhang part 2 is 4 to 5 mm, as shown in Fig. 1. In some cases, it appears as if it is difficult to release the mold due to the screen dimensions. However, the molded product can be easily removed from the mold by utilizing the contraction of the material during cooling and the deflection caused by forced force.

FIG. 2 is an enlarged view of the overhang portion 2 before contraction. Here, the mirror 6 is shown as being constituted by a mirror surface 7, an end surface 8, and a thread surface 9. This shows the state immediately after the plastic sheet has been softened by heating and adsorbed to a mold to shape it. The mirror 6 inserted here is dimensioned so that it can fit into the receiving part J with a margin of about 1 mm (space S) from the overhang part 2 at the time of insertion.
Therefore, the upper table of the molding machine (not shown)
When the mirror 6 is lowered and inserted from the mirror 6, it can be left still and inserted into the back surface corresponding part 5 without contacting the overhang part 2.

After this, cooling in the above-mentioned thermoforming process is started. Thermoforming temperature of plastic sheet is 150℃
, the temperature difference up to room temperature 20℃ is 130
℃, and the amount of contraction is 9.1 mm in the longitudinal direction and 4.5 mm in the lateral direction per meter. In reality, wall thickness changes occur due to thermal expansion of the mold and stretching during molding, but generally the numerical trends are as described above.

The molded product main body 1 contracts as it cools, reaching the state shown in FIG. That is, the overhang portion 2 contracts to cover the upper end of the mirror 6. On the other hand, the dimensions of the mirror 6 hardly change during each process. Therefore, after contraction, it is firmly received within the receiving part J as shown. In this case, for example, acrylonitrile butadiene styrene resin has a tensile strength of about 700 kg/cm ² , whereas glass has a much higher compressive strength, achieving a strong fixation of both.

On the other hand, the mold comes into contact with the back surface 10 of the overhang part 2, but due to contraction, the back surface 10 of the overhang part 2
Since the distance 0 is set in advance taking into consideration the distance from the mold, the molded product can be removed from the mold without any problem.

The mirror with a fixed frame thus obtained is covered all around with a strong overhang, so it cannot be removed from the molded product unless a method other than destruction is used.

FIG. 4 shows a partially cutaway perspective view of the finished product as an example. As shown, the mirror 6 is held by the overhang portion 2 so that it does not fall off.

When carrying out the experiment using acrylonitrile butadiene styrene, which shrinks 5 mm per 500 mm, it can be expected that it will shrink 2.5 mm on one side from the center line C shown in Figure 1, and since the distance S mentioned above is 1 mm, the difference is
The 1.5mm mirror 6 will fit into the receiving recess 3.

Furthermore, when the end portion 8 of the mirror 6 comes into contact with the receiving recess 3 during implementation, it is conceivable that stress will be concentrated and the main body 1 will be deformed. Therefore, direct contact between the end 8 of the mirror 6 and the bottom surface of the receiving recess 3 is avoided.For example, a protrusion 14 shown in FIG. 5 is provided to sandwich the mirror 6 between the inner surface 2 of the overhang 2. It is also effective to adopt a configuration in which the

<<Example of the second claim>> To explain the case of straight molding as an example, as shown in FIG. Perform molding. A mirror 6 is located on this mold surface 16 at a portion corresponding to the mirror receiving portion J of the product to be molded 1'. At this time, the mirror surface 7 side of the mirror 6 is placed face down toward the mold 15. This mirror 6 is placed at a somewhat higher position than the rest of the mold surface 16 by means of a support ridge 17 provided on the mold surface 16. Further, the mirror 6 is dimensioned such that its peripheral edge 6' is larger than the side circumferential surface 17' of the raised portion 17, that is, it protrudes beyond the side circumferential surface 17'. Therefore, if the mirror 6 is viewed through the bottom of the mold 15 (although this is not possible in reality), the peripheral portion 6' of the mirror 6 will appear to be flange-shaped.
The heated sheet-like body 1' (synonymous with the above-mentioned product to be molded) is placed along the mold surface 16 and the back surface 18 of the mirror 6. Cooling is performed in this state. Cooling is carried out in the same manner as in the first claim.

In addition, as for the material, those disclosed in the explanation of the first claim (high impact vinyl chloride board, resin board such as acrylonitrile butadiene styrene, high impact polystyrene, or other material that shrinks when cooled after molding) are used. Implemented. However, in the invention shown in this second claim,
Shrinkage due to cooling is not necessarily an essential requirement, and other materials can also be used as long as they satisfy only hardenability. In other words, you can find a wide range of materials for plastics in general. Also, materials other than plastic, including composite materials, can be used as long as they harden over time.

The molded product main body 1 molded by the mold 15 as described above is finished in a state in which the mirror 6 is incorporated after hardening, as shown in FIG. That is, the mirror receiving part J provided with the receiving recess 3, overhang part 2, etc. described in the description of the embodiment for the first claim is shaped by the very existence of the mirror 6.

Furthermore, in the invention of this item, there is no need to set the interval S as described in the embodiment corresponding to the first claim.

<< Matters incidental to the embodiments common to both claims >> The examples that have been exemplified mainly focus on shaping the overhang that encompasses the entire circumference of the mirror, but it may also be implemented by partially shaping the overhang. Alternatively, it may be pressed at several points or by a linear portion.

In plastic molding, vacuum molding, especially straight molding or drape molding, is most suitable.

This application describes a method for manufacturing a mirror with a frame, a makeup mirror,
It can be applied to the manufacture of various mirrors such as bathroom vanities.

<Effects of the Invention> By carrying out the first invention of the present application, since the mirror is fixed during the period from the shaping of the holding frame of the framed mirror to the completion of shrinkage, a separate process for fixing the mirror is required. There is no need to set . Therefore, the manufacturing process is simplified, and the process to complete the framed mirror can be completed within the time required to form the frame, and the completion of shaping the holding frame means that the mirror is completed as a product.

Furthermore, the mirror manufactured by this method does not require a separate fixing means to the frame, and can significantly reduce costs by reducing the number of parts and eliminating conventional manual fixing means. did. In this way, since the shrinkage from the shaping process to the cooling process is utilized, on the other hand, it does not require any fixing equipment or equipment, which is extremely advantageous for the manufacturer.

After completion, the mirror is extremely sturdy and will not fall off the frame even after long-term use.

Furthermore, by carrying out the second invention of the present application, shaping the holding frame of the framed mirror itself becomes a mirror fixing process, and the attachment of the mirror is completed at the same time as shaping is completed. It has become possible to significantly reduce the time it takes to reach the final product.

In this case, especially in the holding frame, there is no need for a mold for the part that receives the mirror, and even the work of cutting out the mold that forms the mirror receiving part is eliminated, thereby reducing the need for a means for fixing the mirror. Not only can this be eliminated, but the number of molds used during shaping can also be reduced, making it possible to significantly reduce the cost of manufacturing a framed mirror.

For this reason, by implementing the second invention, similarly to the first invention, it is possible to significantly reduce costs by reducing the number of parts and eliminating conventional fixing means that rely on manual labor, Installation for fixing
This has brought an extremely advantageous effect to manufacturers in that no equipment is required. Also, by carrying out the second invention, the mirror after completion is extremely strong without fear of falling off from the frame even after long-term use.

[Brief explanation of drawings]

FIG. 1 is an end view showing an embodiment of the invention according to claim 1 of the present application. FIG. 2 is an end view of the main part before contraction, and FIG. 3 is an end view of the main part after contraction. FIG. 4 shows a partially cutaway perspective view of another embodiment of the invention according to claim 1 of the present application. Fifth
The figure is an end view of essential parts showing another embodiment of the invention according to claim 1 of the present application. FIG. 6 is an overall sectional view of a mold showing an embodiment of the invention according to claim 2 of the present application. FIG. 7 is an end view showing an embodiment of the invention according to claim 2 of the present application.

Claims (1)

[Scope of Claims] 1. During the process of manufacturing mirrors for cosmetics, etc., there is a forming process in which a material that can be heat-formed and shrinks when cooled is shaped into a holding frame by thermoforming, and A cooling process in which the mirror holding frame is cooled from the molding completion temperature, and during this cooling process and before the shrinking process is completed or an equilibrium state is reached, the inside of the mirror receiving part of the holding frame formed from the above material is cooled. It consists of a mirror insertion process in which a mirror is inserted into the
On the other hand, the dimensions of the holding frame shaped in the shaping process are such that the mirror can be easily inserted into the holding frame before the contraction is completed or the equilibrium state is reached, and In some cases, the mirror is set in advance to be contracted to such an extent that it does not fall off from the mirror receiving portion of the holding frame, and the mirror is completely attached to the holding frame at the same time as the forming of the holding frame is completed. How to fix the mirror to the holding frame. 2. Part of the mold for forming the holding frame during the process of manufacturing cosmetic mirrors, that is, during the forming process of the mirror storage frame, which is molded using a material that can be heat-molded and hardens upon cooling. It consists of a mirror to be held in this holding frame, and during molding, the mirrors are placed at appropriate intervals so that they are enclosed by the material, so that after molding, that is, appropriate hardness is imparted. After being
The above-mentioned mirror, which was part of the mold, is taken into and held within the holding frame, and the attachment of the mirror to the holding frame is completed at the same time as the forming of the holding frame is completed. How to fix the mirror to the frame.