JP2002120277A - Bend restoration method for resin molded item - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bend restoration method for a molded item which can correct deformation with a small force and ease when the deformation is produced in an injection-molded item provided with a reinforcement such as scissors for sterilization. SOLUTION: A bend restoration method comprises a first process of arranging a maximum curvature portion of a resin molded item between a pair of positioning protrutions 53 and 54 and pushing a bulged portion 50 to the resin molded item in this state from an opposite side, a second process of amending deformation produced at an edge side from a central portion by giving a force while arbitrarily moving a pushed position toward the edge of the resin molded item and a third process of correcting deformation produced at the other edge side from the central portion by giving a force while arbitrarily moving a pushed position toward the other edge of the resin molded item.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bending back a resin molded product in which a reinforcing member is embedded as a core.

[0002]

2. Description of the Related Art Conventionally, when a container such as a baby bottle used for nursing infants is subjected to boiling disinfection or chemical disinfection, for example, a tong-type disinfecting scissor 100 as shown in FIG. Is used. This disinfecting scissors 1
In the case of 00, the point of force is
a, 106a, considerable hand force is required to clamp the feeding bottle 108 between the distal ends 106b, 106b of the clamping portions 106, 106. Moreover, the baby bottle 108
Is relatively heavy because it is made of glass or the like, or when a chemical solution, high-temperature hot water, or the like is contained therein, the holding portions 106, 106 are mutually twisted in the direction of arrow A due to the weight thereof, and the feeding is performed. There is a possibility that the bottle 108 may fall off the holding portions 106, 106.

For this reason, there have been cases where Western scissors-type disinfecting scissors 200 as shown in FIG. 7 are conventionally used. The disinfecting scissors 200 include a holding portion 202 formed at a front end portion, an operation portion 204 formed at a rear end portion, and a holding member main body portion 206 formed between the holding portion 202 and the operation portion 204. And a pair of holding members 208 having the following. Then, the pair of holding members 208
They are engaged with each other via a movable fulcrum 210 so as to be openable and closable. When the two holding members 208 open and close with each other, an article such as a baby bottle can be detachably attached between the two holding portions 202. It can be grasped.

[0004] By the way, even with such Western scissors-type disinfecting scissors, the disinfecting scissors 200 for boiling made of a metal such as stainless steel are used when boiling and disinfecting a baby bottle and the like. It is necessary to separately prepare disinfecting scissors 200 for disinfecting a chemical solution made of synthetic resin such as polypropylene. This is because disinfecting scissors made of synthetic resin such as polypropylene have low rigidity and are not suitable for boiling disinfection, so it is necessary to use disinfecting scissors made of metal such as stainless steel with excellent heat resistance. Because. In the case of chemical disinfection, the metal reacts with the disinfectant such as sodium hypochlorite, and the metal corrodes. This is because it is necessary to use disinfecting scissors made of a synthetic resin such as polypropylene, which is not provided.

However, it is costly to prepare and use different scissors for disinfection in this way,
Disinfection work becomes complicated. Therefore, disinfecting scissors in which a reinforcing member such as a metal is contained inside a resin are also provided today. According to such disinfecting scissors, appropriate rigidity and chemical resistance can be provided, so that both boiling disinfection and chemical disinfection can be performed with one disinfecting scissor.

[0006]

By the way, a resin molded body having a complicated shape and having a reinforcing member inside therein, such as such a disinfecting scissors, is prepared by injecting a resin into a mold, When the mold is released, there is a problem that deformation occurs in a portion where the reinforcing member is not included or a portion where the thickness of the resin is changed, and the product value is reduced.

The present invention has been made in view of such circumstances, and when a resin molded body provided with a reinforcing member such as a disinfecting scissor is deformed by injection molding, the deformation is reasonably performed. It is an object of the present invention to provide a method for bending back a resin molded body that can be easily corrected with a small force.

[0008]

According to the present invention, there is provided a method for bending back a resin molded article, which achieves the above object, by using a bending deformation caused by injection molding of a resin molded article having a reinforcing member embedded therein. A method of bending back a resin molded body for returning to a dimension, wherein a maximum bending portion in which bending deformation of the resin molded body occurs is arranged between a pair of positioning convex portions arranged at a predetermined interval. A first step of restoring a central portion of deformation by pressing a bulging portion from the opposite side of the positioning convex portion in a state where the maximum bending portion is arranged between the pair of positioning convex portions; After repairing the deformation at the maximum bend in the bend area by the first step,
A second position for restoring the deformation occurring on one end side from the center by appropriately moving the position pressed from the center toward one end of the resin molded body and applying an external force.
After the deformation caused on the one end side from the center by the second step is repaired by the second step, an external force is applied by appropriately moving a position pressed from the center toward the other end. A third step of restoring the deformation occurring on the other end side from the center part.

According to this method, the bent resin molded article can be corrected to the original state. Further, the method for bending back the resin molded body of the resin formed body according to the present invention,
It is preferable that a bending amount defining stopper is disposed between the pair of positioning projections.

With such a configuration, it is possible to prevent an excessive force from being applied to the deformed portion and causing a new deformation. Further, in the present invention, it is preferable that the bulging portion is reciprocated by a hydraulic or pneumatic cylinder. With such a configuration, the adjustment of the force applied to correct the deformation can be easily performed.

Further, the resin molded product according to the present invention can be preferably applied to disinfecting scissors for disinfecting by gripping a baby bottle or the like.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for bending back a resin molded product according to the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing disinfecting scissors as an example of a resin molded body applied to the bending back method of the present invention.

The disinfecting scissors 10 are composed of a pair of holding members 12 and 14 which are assembled to each other, and can be used for both boiling disinfection and chemical disinfection. On the other hand, these holding members 12 and 14 are respectively formed between a holding portion 16 formed at a front end portion, an operation portion 18 formed at a rear end portion, and the holding portion 16 and the operation portion 18. And the holding member body 20.

The holding portion 16 includes a holding portion main body 22 formed in a substantially arcuate shape, and a tip holding portion 24 formed at the tip end thereof.
And In the holding portion main body 22, a holding portion 28 having a partial disk shape for holding the held object is formed on a holding surface 26 on the side that comes into contact with the held object such as a baby bottle, with a predetermined interval therebetween. ing. On the other hand, the tip holding portion 24
Is for holding and gripping a relatively small article such as a nipple of a baby bottle, for example, and a plurality of concave grooves 30 are formed on the side of the holding surface that is in contact with the held article. Accordingly, the frictional force with the article to be held is increased to thereby increase the holding force at the time of gripping.

Further, each of the holding member body portions 20 of the holding members 12 and 14 has a concave flat rotating sliding portion 36 having a thickness almost half that of the holding member body portion 20 near the tip end thereof. , 38 are formed. A protruding shaft portion 40 is protruded from a center portion of the rotary sliding portion 38 of the holding member 14, and a shaft portion 42 of the protruding shaft portion 40 is provided on an upper end portion thereof.
Locking portions 44 extending on both sides so as to be perpendicular to
Are formed.

On the other hand, an engagement hole 46 having a shape corresponding to the shape of the protruding shaft portion 40 is formed in the rotation sliding portion 36 of the holding member 12.
Are formed. That is, in this engagement hole 46,
The protruding shaft portion 40 includes a shaft hole portion 48 corresponding to the shaft portion 42 and a locking hole portion 51 corresponding to the locking portion 44 of the protruding shaft portion 40. The operation unit 18 has a long hole 32 for inserting a finger.

The projecting shaft portion 40 and the engaging hole portion 46 constitute a movable fulcrum, so that the sandwiching members 12, 14 can be opened and closed with each other via the movable fulcrum. And is configured to be detachable. Therefore, for cleaning, the two holding members 12, 14
Can be removed from each other and disassembled.
Further, as shown in FIG. 2 and FIG.
A metal reinforcing member 64 is buried in the range from the holding portion 16 to the holding member main body 20 in the portions 14.
The metal reinforcing member 64 includes the holding portion 16 and the holding member main body 2.
It is formed substantially corresponding to the shape of 0.

As described above, since the metal reinforcing member 64 is buried between the holding portion 16 and the holding member main body portion 20 of the holding members 12 and 14, when a heavy article to be held is held. Even if there is, the held article does not fall off, and a large force is not required, so that the article can be reliably held. Also, the metal reinforcing member 64
Is in a state covered with resin, for example,
Even when used in a disinfectant such as sodium hypochlorite, there is no risk that the metal reinforcing member 64 will react. Therefore, boiling disinfection and chemical disinfection can be performed with one disinfecting scissor, and the operability is excellent.

When the disinfecting scissors 10 are to be molded, first, a metal reinforcing member 64 is arranged in a dedicated mold for molding the clamping portion 16, and then the clamping portion 16 is formed.
Is introduced into the holding portion forming die, and the substantially arcuate metal reinforcing member 64 is covered with the elastomer. Next, the molded body coated with the elastomer in this way is placed in a separately prepared clamping member molding die. Thereafter, from this state, a molten synthetic resin such as polypropylene is introduced into the holding member molding die to synthesize an exposed portion of the metal reinforcing member other than the portion corresponding to the holding portion 16 of the metal reinforcing member 64. Cover with resin. Thus, the disinfecting scissors 10 can be obtained.

If the disinfecting scissors 10 having the metal reinforcing member 64 as a core material are formed in two stages as described above, the base end 52 of the holding portion 16 covered with the elastomer is partially formed of polypropylene or the like. Since it is completely covered with a synthetic resin having excellent chemical resistance, abrasion resistance, impact resistance, and the like, there is no joining portion between the holding portion 16 and the holding member body portion 20, and therefore, The strength of the metal reinforcing member can be maintained for a long period of time without the disinfectant solution penetrating inside and the metal reinforcing member being corroded.

By the way, the disinfecting scissors 10 obtained in this way have the bent metal reinforcing member 64 inside, the resin has a partially different wall thickness, and the mold shape is complicated. For example, when the two holding members 12 and 14 are assembled with each other after the two holding members 12 and 14 are formed, a step may be generated between them. this is,
This is because, as shown in FIG. 3, for example, a portion of the operation portion 18 where the metal reinforcing member 64 does not exist is slightly warped, and the deformation S is generated. Such a deformation S needs to be returned to the original design size in order to lower the commercial value.

Hereinafter, a method for returning the disinfecting scissors 10 having such deformation S to the original design dimensions will be described. FIG. 4 shows a distortion adjuster suitable for correcting deformation of a resin molded product such as disinfecting scissors. In the distortion adjuster 41, the shaft 47 expands and contracts by the driving force from the air cylinder 42, and the movable plate 45 moves linearly with the expansion and contraction. The fixed plate 49 is arranged to face the receiving side. The movable plate 45 has a hemispherical bulging portion 50 provided substantially at the center thereof, and the fixed plate 49 has a positioning convex portion 5 spaced by a predetermined distance so as to sandwich the bulging portion 50.
3, 54 are provided. In addition, the positioning projection 53,
A stopper 56 for defining the maximum bending return amount is provided at a substantially intermediate position between the positions 54. The protrusion height of the stopper 56 is set lower than the protrusion heights of the positioning protrusions 53 and 54 on both sides.

With respect to such a distortion adjuster 41, when the holding members 12, 14 and the like, which have been deformed, are taken out of the mold, they are arranged in a posture in contact with the fixing plate 49 as shown in FIG. Is done. In setting such an object to be processed, first, as shown in FIG.
In the range where (1) occurs, the bulging portion 50 of FIG.

After setting as described above, the cylinder 42 is driven by an appropriate pressure set in advance to press the portion having the largest deformation (first step). Then, the pressed part receives a force in the direction in which the deformation is returned between the positioning protrusions 53 and 54. In addition,
In order to prevent the object from moving, the operator may hold the object by hand or fix the object by providing appropriate means.

After the portion having the largest deformation is pressed to correct the deformation of the portion, the portion is pressed a plurality of times against the holding member 12, which is the object to be processed, while changing the position little by little. In that case, following the maximum bend, for example, FIG.
It is preferable to perform the positions shown in (1) in order. That is,
When the portion having the largest deformation is pressed, the holding member 12 is shifted in one direction, is pressed, and then is pressed (second step). After the deformation of one half is corrected in this manner, the pressing is performed in order toward the other side (third step). In this way, by pressing the one end portion and the other end portion in a direction away from the center point in order, the entire bend can be corrected without difficulty. 2, 3 and 5, reference numeral 7
2 is to fix the metal reinforcing member 64 in the resin,
FIG. 4 shows a cylindrical member 72 inserted into a center hole of the metal reinforcing member 64. The position of the cylindrical member 72 is as follows.
Although large deformation is likely to occur, this position is likely to be cracked due to compression at the structure, so it is necessary to avoid this position and compress.

Thus, after the injection molding, the holding members 12,
By modifying the deformation of 14 in a plurality of times, the modification can be reasonably corrected without requiring a large force. In addition, if the shape of the bulging portion 50 and the shape of the positioning protrusions 53 and 54 are hemispherical, no excessive force acts, so that no new deformation occurs when pressing.

As described above, according to the method of bending back a resin molded product according to the present invention, deformation caused by shrinkage of a resin molded product in which a metal reinforcing member is embedded is reduced by a small force. And can be easily modified. In the above embodiment, the scissors for disinfection were described as an example of the resin molded body.
It is not limited to disinfecting scissors at all. The metal reinforcing member 6
4 can be applied to other articles such as ceramics. Further, the pressing pressure and the number of times of pressing can be appropriately selected depending on the size of the processing body.

[0028]

As described above, according to the method of bending back a resin molded product according to the present invention, a bent portion can be easily and easily corrected with a small force. There is no possibility of causing other deformation during the correction. Therefore, if this bending back method is applied to disinfecting scissors, it is possible to provide disinfecting scissors capable of performing both boiling disinfection and chemical disinfection with a single disinfecting scissor having a complicated structure.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of disinfecting scissors in which a method for bending back a resin molded body according to the present invention is performed.

FIG. 2 is a plan view when the disinfecting scissors shown in FIG. 1 is assembled.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a perspective view of a distortion adjuster for performing the bending-back method according to the present invention.

FIG. 5 is an explanatory view showing a position where a load is applied when bending is returned by the adjusting device shown in FIG. 4;

FIG. 6 is a perspective view of scissors for holding conventional disinfecting scissors.

FIG. 7 is a plan view of conventional scissors for scissors of the Western type.

[Explanation of symbols]

 Reference Signs List 40 cylinder 54 positioning protrusion 56 bending amount stopper 64 metal reinforcing member 108 baby bottle

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B29L 22:00 B29L 22:00 (72) Inventor Takashi Mariya 320 Maru Shimamachi Hardware, Miki City, Hyogo Prefecture 4F206 AA11 AD03 AG07 AH55 JA07 JL02 JW26 4F209 AA11 AD03 AG07 AH55 NA11 NB01 NG11 NW21

Claims (4)

[Claims] 1. A method for returning a resin molded body having a reinforcing member embedded therein to a design dimension by bending deformation caused by injection molding of a resin molded body, comprising: a pair of resin molded bodies disposed at a predetermined distance from each other. Between the positioning protrusions,
While arranging the maximum bending portion where the bending deformation of the resin molded body has occurred, and pressing the bulging portion from the opposite side of the positioning convex portion in a state where the maximum bending portion is arranged between the pair of positioning convex portions. A first step of restoring a central portion of the deformation by applying, and after restoring the deformation at the maximum bending portion of the bending region by the first step, from the central portion toward one end of the resin molded body. A second step of restoring the deformation occurring on one end side from the center by appropriately moving the pressing position and applying an external force; and a second step on the one end side from the center by the second step. After restoring the deformation that has occurred, the position that is pressed from the center to the other end is appropriately moved to apply an external force, thereby restoring the deformation that occurs from the center to the other end. Third Unbending method of the resin molded body characterized by comprising the steps, a. 2. The method according to claim 1, wherein a bending amount regulating stopper is disposed between the pair of positioning projections. 3. The method according to claim 1, wherein the bulging portion reciprocates by a cylinder. 4. The method according to claim 1, wherein the resin molded body is disinfecting scissors for disinfecting by gripping a baby bottle or the like.