JPS60500409A - Molding method and equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Molding method and equipment Field and background of the invention The present invention uses reactant chemicals to form foamed plastics such as polyurethane. This invention relates to a method for molding a foamed article to be used.

Traditionally, foamed plastic articles have been formed using both open and closed molding methods. The majority are three-dimensional objects used for packaging, decoration and structural purposes. It has been proposed that it can be manufactured. It seems to be used to carry out such methods One consistent problem throughout molding operations and equipment is that Obtaining a smooth surface finish and, on the other hand, also making it easy to release the molded article from the mold. and to obtain. Particularly for certain foam materials, thermosetting chemical The foaming carried out, e.g. incyanurate and polyurethane, is a controlled surface The inability to obtain a finish and a free-flowing mold severely limits the usefulness of these materials. It was restricted.

Attack these problems by using a mold spray-painted with a release agent. This has been attempted in the past. that such release agents have a very limited lifespan; It was found that microscopic cracks were created during spray painting and molded into them. This is the result of the ingress of materials. Such cracks are formed and formed. Due to material intrusion, free release of the molded article is no longer possible, and the service life of the mold is rapidly reduced. End quickly (2) Detailed description of the invention With particular regard to the problems and difficulties encountered heretofore, it is an object of the present invention to A three-dimensional pair of chemical foams by a rubbing method to obtain a controlled surface finish. The goal is to achieve the desired shape. Foamed materials realize this object of the invention. A mold was formed of a fluorocarbide polymer film in which the object was formed. Line with liner. The type of film specified has a very smooth surface; It allows achieving a high degree of surface finish on the foam formed against the mold. this When used in accordance with the present invention as described hereinafter, the coatings encountered in the prior spray coating Micro-cracking is completely avoided and the useful life of the mold according to the invention is more fully realized. Ru.

Yet another object of the invention is to form a mold in which the foam is formed into the desired shape. The aim is to achieve immediate release of the molded foam object. To achieve this purpose of the invention The fluorocarbon polymer liner used in the molding process prevents the molded foam from adhering to the mold shape. stop, thereby allowing the finished product to be easily released. of the present invention According to an embodiment, as will be more fully emphasized hereinafter, the molding from the mold The product or object is removed by inflating the liner with fluid pressure. achieved.

Still another object of the invention is to provide a molding apparatus for carrying out the above method. The purpose of the fluorocarbon polymer liner is to provide the correct functionality of the equipment. Form necessary for transformation (3) It looks like it has been vacuum formed in shape and position. In realizing this object of the invention, A mold shape is provided, a liner film of the mold described is provided, and the liner is formed into the shape of a mold. Certain aspects of the invention (which may be more fully described hereinafter) As noted in , the liner is inflatable by fluid pressure. Other aspects Accordingly, the liner may be glued in position ζ during use and as required. Maintain the efficiency of the molding equipment by making it possible to update the molding equipment. Furthermore, the mold shape used is open. Essentially, non-limiting foaming may be used, or closed foaming may be used. Although some of the objects of the present invention are mentioned above, limited and pressurized foaming, other objects are This will become clearer as the description given in connection with the figure progresses.

FIG. 1 is a perspective view of a molding apparatus according to the present invention, showing one stage of the process of the present invention. I'm drawing.

Figure 2 is a schematic elevational view, partially in section, through the apparatus of Figure 1; Depicts other stages during the invention process.

FIG. 3 is a diagram similar to FIG. 2, depicting another stage in the process according to the invention.

FIG. 4 is an exploded perspective view of the apparatus shown in FIGS. It shows other stages depending on the process.

Detailed description of the invention The present invention will now be more fully described with reference to the accompanying drawings, and (4) T8Fi Sho GO -500409 (3) Although the trowel represents a preferred embodiment of the present invention, the following Before the description begins, a person skilled in the appropriate art should be able to qualify the invention described herein. On the other hand, it should still be understood that the preferred results of the present invention may be achieved. Ru. ``Therefore, the description of the deficiency is a broad teaching aimed at those skilled in the appropriate art.'' It should be understood as a disclosure and not as a limitation on the invention.

Referring now to Appendix A in more detail, an apparatus illustrating one aspect of the invention is therein. The method according to the invention will be described in conjunction with the description of the apparatus. Device Alternatives to and methods will become more apparent as they are described. cormorant. The particular device depicted has a mold box generally designated 10, in which A mold member 11 is placed. Among the shapes depicted, box 10 is generally square; The shape defines a mold depression, and the member 11 may be referred to as a convex or male mold member. It is something that As will be pointed out later, the three-dimensional structure created within the mold box 10 The article or object has a concave surface for receiving the object into the package. here The invention described in is also useful for other types of molds such as those that will be described. It is considered that

The mold box 10 has provisions for vacuum forming a fluorocarbon film liner, which is Among the embodiments shown, including an air handling device shown generally at 121. There is. The mold box 10 and the members 11 therein have passages formed therein for air flow. For those skilled in vacuum forming polymer film technology (5) has as generally known.

According to the present invention, a fluorocarbon polymer film, generally designated 14i, comprises: It is used as a liner for the mold cavity formed in the box 10. polymer film According to the invention, polychlorotrifluoroethylene, polytetrafluoroethylene tyrene, fluoroplastics, polyvinylidene fluoride, and carbon-fluor Between the classes consisting of copolymers with an elementary main chain and polyfluoroalkyl side chains A polymer film is formed from a polymer selected from the following.

Such films have in common the slipperiest of all solids and are essentially inert. It also has the characteristics of good mechanical strength. film mechanical Strength provides significant resistance to repeated bending or folding stresses, thereby providing Helps avoid micro-cracks. Such films can be etched in a suitable place; In addition, it is possible to use techniques essentially known to persons skilled in the art of applied vacuum forming techniques. Can be air-formed.

To practice the invention, film 14 is placed on the open side of box 10 and It is held in place by suitable means such as the gripper 15. Even if you use other types of grips Many vacuum forming engineers will know this. Film 14 is then composed of The air is drawn into the recess provided in the box 10 by removing the air by means of the device 12. Ru. Heating is performed by a convection air heater 16 that blows hot air toward the fiflame. May be, Asu C Ha L + Orbital Mackerel 1. ? -Senku W-type engineer: As is well known, radiation is applied. fever (6) It may depend on the source. When the liner is vacuum formed into the mold, the film conforms to the shape of the mold cavity. to provide a smooth, highly finished surface to the recess.

The mold is now ready for the introduction of the blowing reactant, which involves introducing such chemicals into the appropriate This is done by delivery through a nozzle or gun 18. the nature of the chemicals used; It is common practice in the chemical industry to mix them and deliver them in such a way that a foaming reaction begins. This is well known and will not be described in detail here. The apparatus and method of the present invention provide such foaming It is thought that it can be used for any kind of science and technology. However, the book The invention is based on a chemical that has heretofore been impossible to adapt to molding techniques such as those described herein. The academic system has special value. Particularly in certain applications, The two foam systems are V-tongue based. Urethane foam is economically attractive. However, what has not been used in some packaging and structural applications is a suitable surface finish. Due to the difficulty of obtaining the top and the difficulty of releasing the molded product from the mold used. be. The present invention solves both of these problems. This significantly expands its usefulness.

In some such foaming systems, it is desirable to control the pressure at which foaming occurs.

In such systems, the molding apparatus according to the invention may be fitted with a cover 19 (FIG. 3). It is possible to control the pressure during the reaction in some suitable manner and thus to control the foaming. Control body density. As shown in Figure 3, the reactants introduced into the mold are Molded article or object 2° (7) form.

In the depicted apparatus, subject 20 inflates the film liner as shown in FIG. It can be peeled off or released from the mold by washing. There, the air handling device 12 inflates the liner 14 by applying fluid pressure between the liner and the mold box 10. It was used for As the film expands, the pairs formed in the molding operation Elephant 20 is removed from the mold.

The mold is now ready to repeat the step of drawing the liner into position by vacuum. , mold the object, and release the object from the mold. (So, a continuous object is formed, All come with the desired high surface finish.

Although the fluorocarbon polymer films used have good mechanical strength, molding As the cycle continues, the bending stress causes ultimate failure of the liner. Good morning. If this fails, immediately remove the liner according to the method described for this point. , the molding operation can be continuous.

According to another aspect of the above-described invention, molding in an open-sided mold removes the molded article from the mold. Peeling can be achieved with or without inflating the film liner. I can do it. The molds used can be male or female and can have concave, convex or compound shapes. It can be applied to the object to be molded. Open side type without inflating the liner Where it is to be used, the liner is etched on one surface and adhered to the site of use. Good too. Then remove it from the mold if you need to replace it later. By such methods, the mold The useful life is significantly extended and allows the mold to be made of cheaper materials.

Moreover, such methods require The liner undergoes thermal expansion changes and supports the liner during molding. Adjust for shrinkage between the mold structure and the mold structure. This adjustment is a feature of the present invention. It is believed that this contributes to the elimination of micro-cracks, which are known to occur.

According to yet another aspect of the invention, the liner is formed into the desired shape by techniques other than vacuum forming. It can also be formed into a shape. For example, liners are die cast, blow molded Whether molded, compressed, injection molded, or extruded, the supported structure can be molded into the desired shape. on the other hand, the liner is free to move or be removed from the mold structure. They can be formed using these processes as long as they are suitable. Thus, vacuum forming is a liner - Although it may be the preferred process for formation, it is only one of the possible means. It should be recognized that there is no such thing.

The drawings and specification present preferred embodiments of the invention and use specific terminology. However, such a description is only a use of rhetoric in the inclusive and descriptive sense. Well, it's not because of restrictions.

Jokichi (no change in content) FIG, 2 FIG, 3 Mr. Manabu Nopei, Commissioner of the Patent Office 3. person who makes corrections Relationship with the incident! lt Qi revision ya” Oki, shi Calligraphy bowl; Kanpei Chiko B 101517820 days 9 spears available @ sacrificial spear C 1) The current Y-ro phoneme of the 1st term of the 1st term of the 1st term of the 1st term of the 1st term of the 1st term of the 1st term of the 1) 碍 International inspection report AI-rNEX To Thj I) iTERNAT 0NAL SE, '1R (j(RE?ORT 0NrNTERNATrONAL APPr+ICATI ON No, PCT/US 83102057 isA 6392) The European Patent office is in no way 1able for these parts which ar e merally given far the parpose oflnf ormatior.

Claims (1)

[Claims] ■, a fluorocarbon polymer film mold shaped to fit tightly into the mold member positioning the liner in engagement with the mold member; A reactive agent that foams onto the lining mold member to form a foam that has the same shape as the mold member. and then peeling the article from the mold member and the liner; A method of manufacturing a molded foam object comprising the steps of. 2. Shape the fluorocarbon polymer film mold liner to fit closely with the mold parts. The foam is formed on the inner mold member, and then foamed to form the same shape as the mold member. Deposit the reactant to subsequently mold the body and then peel the liner from the mold member. , forming a fluorocarbon mold liner and positioning it in engagement with the mold member, followed by a plurality of The claims further include the step of: preparing the foam to be molded. The method described in box 1. 3. In the mold liner formation stage, a fluorocarbon polymer film is vacuum formed onto the mold member. the step of peeling the article from the mold member and the liner further comprises: 3. A method according to claim 2, which comprises inflating the tube. 4. The step of peeling the article from the mold member and liner involves applying fluid pressure to the liner. The step of inflating the liner and placing the article into position on the mold member of the molding male under vacuum and deposit the foaming reactant, apply fluid pressure and evacuate the liner (1O). 3. The method of claim 2, wherein the steps of entering the position are repeated. 5. In the liner formation stage, the film is attached adjacent to the mold member, and the film is The film is heated to increase its temperature to make it flexible, and a vacuum is drawn between the film and the mold member. A claim consisting of ensuring a close fit to the mold part. The method according to claim 3 or 4. 6. The step of heating the film involves directing the heated air flow towards the film. 6. The method according to claim 5, comprising: 7. Heating the film involves directing radiant energy toward the film. 6. A method according to claim 5, comprising: 8. The step of inflating the liner involves applying pressurized fluid to the mold member and film liner. claim 3 consisting of delivery into a volume formed between or the method described in Section 4. 9. mold forming means defining a mold volume for receiving and confining the foaming reactant; forming a shape that fits tightly with the mold forming means when engaged with the mold forming means; The parentheses cooperate with the mold-forming means to form a foam formed from the mold-forming means. A fluorocarbon polymer film type liner that can be quickly removed. It contains The mold liner means (11) to the molded foam product within the apparatus. In order to give the shape of the mold forming means (equipment for molding foam material) . 10. The mold liner means has a molding position in close engagement with the mold forming means I and a nuclear mold. The nuclear mold liner means is movable between the forming means and the inflated release position. When in the molding position, the shape of the mold forming means is applied to the molded foam product in the device. and movement of the molded product from the mold forming means to the inflated release position. 10. Apparatus according to claim 9, adapted to effect separation. 11. The mold forming means includes a mold member having a special shape, and further includes the mold liner. One means includes a film that is vacuum formed in situ to the special shape of the mold member. 11. The apparatus of claim 10, wherein the apparatus comprises: 12 One means of the film type liner is polychlorotrifluoroethylene, polytetra Lafluoroethylene, fluoroplastic, polyvinylidene fluoride, and a copolymer with a carbon-fluorine main chain and a polyfluoroalkyl side chain. Claim 9 formed by a film selected from among the classes. or a device according to one of paragraphs 10. 13. The mold forming means and the mold liner means are sealed against the ground, and furthermore, between the mold forming means and the mold liner means there is a confined volume and including a fluid flow in operative communication with the fluid flowing from and into the volume; (12) 7 JOSHO GO- 500409(2) vacuum forming and also thereby forming said mold liner means into Claim 10, characterized in that it is adapted to move between the molding and ejection positions. Device. 14. Claim wherein said mold liner means is temporarily adhered to said mold forming means. 9. The device according to paragraph 9. (l)