1. A mold for a multi-layer container, the mold comprising:
a cold-half portion (I) comprising a cavity; and
a hot-half portion (II) comprising a first resin flow path for connecting an interior of a first injection cylinder to the cavity, a second resin flow path for connecting an interior of a second injection cylinder to the cavity, and a junction portion of the first resin flow path and the second resin flow path,
wherein:
the junction portion in the hot-half portion (II) is positioned upstream of a gate portion opened to the cavity included in the cold-half portion (I); and
the second resin flow path comprises an inhibitor for partially inhibiting a resin flow.
2. The mold according to claim 1,
wherein:
the inhibitor comprises a convex portion in at least one part in the second resin flow path;
a longest portion in a diameter direction and a longest portion in a circumferential tangential direction of a cross-section in a direction vertical to a flow direction of the second resin flow path have a length of a mm and a length of b mm, respectively, a and b satisfying the following relationships
0.01r\u2266a\u22661r\u2003\u2003(Expression 1), and
0.01r\u2266b\u22661r\u2003\u2003(Expression 2); and
r represents a radius (mm) of the second resin flow path.
3. The mold according to claim 1, wherein the inhibitor comprises a convex portion in at least two sites in the second resin flow path.
4. The mold according to claim 3, wherein the convex portion is provided between 0 cm to 5 cm upstream of the junction portion of the first resin flow path and the second resin flow path.
5. The mold according to claim 1, wherein the inhibitor comprises a convex portion in 15 or less sites in the second resin flow path.
6. The mold according to claim 3, wherein the at least two convex portions are provided at a distance identical to or different from each other from the junction portion at which the second resin flow path and the first resin flow path are jointed together.
7. The mold according to claim 2, wherein a shape of the cross-section in the direction vertical to the flow direction of the second resin flow path is selected from the group consisting of a circle, a semicircle, a polygon, a rectangle, a triangle, a quadrangle and a trapezoid.
8. The mold according to claim 1, wherein a shape of the inhibitor is selected from the group consisting of a linear shape, an acicular shape, a rod shape, a plate shape, a columnar shape, a semicolumnar shape, a globular shape, a triangular shape, a pyramidal shape, a rectangular shape, a cubic shape, a conical shape, and a trapezoidal shape.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-11. (canceled)
12. A system for detecting and locating a disturbance in a medium, comprising:
means for emitting successive acoustic waves in the medium;
means for receiving the successive acoustic waves after propagation thereof in the medium, configured to supply a reception signal based on the successive acoustic waves received; and
means for detecting and locating the disturbance in the medium on the basis of the reception signal;
wherein the emitting means is configured such that, an amplitude andor phase spectrum of each acoustic wave having, at a specific frequency at least, an amplitude, or phase, varying in the medium according to a specific spatial distribution of the amplitude, or phase, and the spatial distributions of the amplitude, or phase, of the successive acoustic waves are mutually different.
13. A system according to claim 12, wherein the emitting means comprises:
an emitting device comprising first and second acoustic wave sources respectively having first and second radiation patterns, which are concentric and different to each other; and
means for modifying relative weighting of the amplitudes of the acoustic waves of the first and second sources, the successive weightings corresponding to the successive spatial distributions, respectively.
14. A system according to claim 13, wherein each radiation pattern has an axis in the direction whereof it is zero, the axes forming an angle different to zero together.
15. A system according to claim 13, wherein:
each acoustic wave source comprises two piezoelectric transducing elements; and
the emitting means comprises means for polarizing the two piezoelectric transducing elements having two mutually opposite potentials, respectively.
16. A system according to claim 15, wherein the emitting device comprises a piezoelectric element coupled with the medium and four electrodes covering a respective quarter of one face of the piezoelectric element, the two transducing elements of the first source comprising two mutually opposite electrodes, respectively, and the two transducing elements of the second source comprising the two other mutually opposite electrodes, respectively.
17. A system according to claim 12, wherein:
the medium comprises a plate having a contact surface;
the acoustic waves are seismic acoustic waves propagated in the plate; and
the disturbance is a contact on the contact surface.
18. A system according to claim 12, wherein:
the medium comprises a fluid on a surface of a plate;
the acoustic waves are compression acoustic waves propagated in fluid on the surface of the plate; and
the disturbance is presence of an interruption in impedance on the plate surface, or caused by presence of an obstacle.
19. A system according to claim 16, wherein the piezoelectric element comprises a sleeve for emitting the compression acoustic waves.
20. A method for detecting and locating a disturbance in a medium, comprising:
supplying control signals to a device for emitting acoustic waves, so that the emitting device emits successive acoustic waves in the medium;
receiving a reception signal from a device for receiving acoustic waves receiving successive acoustic waves after propagation thereof in the medium; and
detecting and locating the disturbance in the medium on the basis of the reception signal;
wherein the control signals are configured such that, amplitude andor phase spectrum of each acoustic wave having, at a specific frequency at least, an amplitude, or phase, varying in the medium according to a specific spatial distribution of the amplitude, or phase, and the spatial distributions of the amplitude, or phase, of the successive acoustic waves are mutually different.
21. A method for detecting and locating a disturbance in a medium according to claim 20, wherein:
the control signals are supplied intermittently such that mean exposure output, even in the ultrasonic range, remains below 85 dB, with a reference of 2\xb710\u22125 Pa, in air one centimeter from the device for emitting acoustic waves;
the control signals having a specific excitation frequency band; and
the method further comprises, before detecting and locating the disturbance in the medium on the basis of the reception signal:
amplifying the reception signal and converting same by an analog-digital converter, the amplification being configured such that amplitude of the received signal in absence of disturbance reaches full quantification scale of the analog-digital converter; and
performing band-pass filtering of the reception signal, on a frequency band corresponding to the excitation frequency band.
22. A non-transitory computer readable medium including computer-executable instructions executable by a processor, comprising instructions for executing a method for detecting and locating a disturbance in a medium according to claim 20, when executed on a computer.