The present invention relates to an injection molding method using a polyether ether ketone (referred to below as PEEK) material and a molded item obtained by the injection molding method.
Originally, PEEK does not rupture because of its large toughness, corresponds to wide molding conditions depending on the weight-average molecular weight, and has excellent heat resistance against low and high temperature. Conventionally, when a molded item is manufactured by injection molding, PEEK is used at a high pressure of 180 MPa to 280 MPa to make full use of its tough physical properties.
However, when PEEK is used in this injection molding, the toughness and rigidity become too high and the flexibility and viscosity are insufficient. Accordingly, when a molded item is manufactured, fracture or breakage is caused by an impact, thereby limiting the shape and effect of the molded item to be obtained.
PTL 1: JP-A-6-170983
Problems to be solved by the invention are that a molded item having flexibility and viscosity could not be manufactured conventionally by using a PEEK material and that there was no molded item of a PEEK material that has flexibility, viscosity, and elasticity.
To address the above problems, in an injection molding method using a polyether ether ketone (PEEK) material according to the invention, a filling peak pressure is 40 MPa to 150 MPa when injection-molding a molded item by a PEEK material.
In addition, in the injection molding method using a PEEK material according to the invention, the PEEK material is injected to form the molded item from a runner member through a multipoint gate, the PEEK material is injected to form the molded item from the runner member through the multipoint gate and then a subrunner, and the runner member and the subrunner are connected to each other by a film gate.
In addition, in the injection molding method using a PEEK material according to the invention, stretching processing is applied after the PEEK material is injected to increase a length 1.2 to 5 fold and increase a diameter to 0.2 mm to 1.0 mm and the stretching processing uses an in-mold stretching method.
In addition, a molded item molded by the injection molding method using a PEEK material according to the invention described in any one of claims 1 to 4 is a locking pin member provided integrally with retaining parts at both ends thereof, in which one of the retaining parts is formed in a paddle.
In addition, a molded item molded by the injection molding method using a PEEK material according to the invention described in claim 5 or 6 is a fastener locking member provided with an insertion part integrally having an engagement part at one end and provided with a locking part that receives the insertion part, engages with the engagement part, and locks a loop state at the other end.
In addition, a molded item molded by the injection molding method using a PEEK material according to the invention described in claim 1 is a tie band provided with an insertion hole having an engagement pawl at one end and provided with continuous ratchet pawls arranged at a constant pitch on one surface in contact with the engagement pawl.
In addition, a molded item molded by the injection molding method using a PEEK material according to the invention described in claim 1 is a bag mouth clip that has a pair of clamping pieces integrally coupled via a hinge, in which one of the clamping pieces is provided with an engagement pawl and the other of the clamping pieces is provided with a reception pawl for receiving and fixing the engagement pawl.
In addition, a molded item molded by the injection molding method using a PEEK material according to the invention described in claim 1 is a fastener locking member having, as molded items, an insertion part provided with an engagement part and a reception part provided with a locking part into which the insertion part is inserted and with which the engagement part engages, in which the insertion part and the reception part are fixed to ends of a loop mold member.
In addition, a molded item molded by the injection molding method using a PEEK material according to the invention described in claim 1 or 2 is a chain fastener locking member having a chain-like loop mold body in which ring bodies are connected continuously, in which one end of the loop mold body has an insertion part provided with an engagement part and the other end of the loop mold body has a locking part into which the insertion part is inserted and with which the engagement part engages.
In addition, a molded item molded by the injection molding method using a PEEK material according to the invention described in claim 1 or 2 is a coil spring.
According to the aspect described in claim 1, the molded item injection-molded using the PEEK material can have flexibility, viscosity, and elasticity. According to the aspects described in claims 2 to 4, the filling pressure in the mold of the PEEK material can be prevented from reducing. According to the aspects described in claims 5 and 6, stretching processing can be performed by the in-mold stretching method, so a stretch is enabled while the temperature of the PEEK material is high and the stretching processing improves the strength of the molded item.
According to the aspects described in claims 7 and 8, the pin part is stretched and strengthened, so the flexibility and elasticity required when retaining parts are restored after passing through the hollow needle for forming an attachment equipment slit can be obtained.
According to the aspect described in claim 9, the flexibility and elasticity of the engagement part of the insertion part and the locking part of the reception part can be obtained and the loop mold part is strengthened by stretching processing.
According to the aspect described in claim 10, the flexibility of the band part during tying can be obtained and the flexibility and elasticity of the engagement pawl and the ratchet pawls can be obtained.
According to the aspect described in claim 11, the flexibility and elasticity of the hinge part for coupling the pair of clamping pieces can be obtained and the flexibility and elasticity of the engagement pawl and the reception pawl can be obtained.
According to the aspect described in claim 12, the flexibility and elasticity of the engagement part of the insertion part and the locking part of the reception part can be obtained.
According to the aspect described in claim 13, the flexibility and elasticity of the engagement part of the insertion part and the locking part thereof can be obtained, so it is possible to obtain a product in which the diameter of the ring bodies forming the chain can be reduced by stretching processing.
According to the aspect described in claim 14, it is possible to make full use of the function of the coil spring by effectively using flexibility and elasticity.
The invention is achieved by performing configuration as illustrated in the drawings and as described in the embodiment.
Next, a preferable embodiment of the invention will be described with reference to the drawings. The invention is based on the condition described in claim 1 and a molded item is obtained based on the injection molding method described in claim 1. That is, when a molded item is injection-molded using a PEEK material in the invention, the filling peak pressure of the mold is 40 MPa to 150 MPa, which is much lower than the pressure (180 MPa to 280 MPa) used conventionally. Molding under such a low pressure provides the molded item with characteristics such as flexibility, viscosity, and elasticity.
Of stretching treatments performed as necessary, the in-mold stretching method is performed based on the principle illustrated in
In addition,
The subrunner 13 is coupled to the discrete locking pin members 10, . . . , 10 via gates (coupling parts) 14, . . . , 14. The gates 14, . . . , 14 are cut by a cutting tool provided for known attachment equipment of the locking pin members 10, . . . , 10, so that the locking pin members 10 can be used as discrete components. In each of the locking pin members 10, both ends of a stretched filament 15 are provided integrally with horizontal bars 16 and 16a for retaining. The horizontal bar 16 of these horizontal bars 16 and 16a is inserted into a hollow needle for forming an attachment equipment slit along the filament 15 by a piston after the gate 14 is cut, and the horizontal bar 16 is restored for retaining after the hollow needle passes through the target.
Although locking pin members 17, . . . , 17 illustrated in
The other end of the filament 20 is provided integrally with a reception part 23 having a through hole 23a into which the insertion part 22 is inserted. In addition, on the inner peripheral surface of the through hole 23a, a locking part 23b that engages with and locks the engagement part 22a of the insertion part 22 is integrally formed in an annular form.
A tie band 24 illustrated in
In addition, a bag mouth clip 32 illustrated in
A fastener locking member 40 illustrated in
The end surface of the reception part 42 has an opening into which the insertion part 41 can be inserted. Inside this opening, a pair of pawls is formed as locking parts 42a with which the engagement part 41a is engaged. It should be noted that reference numeral 42b represents a window hole formed in the reception part 42 through which the lock state can be seen and the pawls can be easily widened. In such a structure, the flexibility and elasticity of particularly the locking parts 42a can be obtained.
In addition, a chain fastener locking member 44 illustrated in
An assembly 48A of coil springs 48 and 48 illustrated in
The injection molding method using a PEEK material according to the embodiment and the molded item using this method are configured as described above. By practicing the injection molding methods described in claims 1 to 6, products that need flexibility, elasticity, or viscosity can be obtained using a PEEK material in addition to the molded items specifically illustrated in the embodiment.
Filing Document | Filing Date | Country | Kind |
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PCT/JP2015/052031 | 1/26/2015 | WO | 00 |