Apparatus and method for manufacturing and inspecting blow-molded plastic containers

• US 20080197542A1
• Filed: 04/21/2008
• Published: 08/21/2008
• Est. Priority Date: 03/26/2002
• Status: Active Grant

• Current Assignee: Agr International, Inc.
• Original Assignee: Agr International, Inc.
• Inventors: Wolfe, Georg V., Schmidt, William E., Puvak, Ronald A., Birckbichler, Craig A., Jebadurai, Sudha C.
• Granted Patent: US 7,780,898 B2
• Time in Patent Office: Days
• US Class Current: 264/410
• CPC Class Codes: B29C 2049/78715 of the blown article thickness
• CPC Class Codes: B29C 2049/7874 Preform or article shape, weight, defect or presence
• CPC Class Codes: B29C 2049/801 Taking preform or article samples, e.g. by cutting out pieces for analysis
• CPC Class Codes: B29C 2949/0715 the preform having one end closed
• CPC Class Codes: B29C 49/06 Injection blow-moulding
• CPC Class Codes: B29C 49/4238 Ejecting defective preforms or products
• CPC Class Codes: B29C 49/42382 Stopping at least a part of the machine
• CPC Class Codes: B29C 49/78 Measuring, controlling or regulating
• CPC Class Codes: B29C 49/80 Testing, e.g. for leaks
• CPC Class Codes: G01B 11/06 for measuring thickness ; e.g. of sheet material thickness measurement by thermal means G01B21/085
• CPC Class Codes: G01B 11/08 for measuring diameters
• CPC Class Codes: G01N 21/9081 Inspection especially designed for plastic containers, e.g. preforms

Abstract

A method and apparatus for manufacturing and inspecting plastic containers. The apparatus may comprise a blow-molder comprising a plurality of molds and spindles for forming a plastic container from a preform. The apparatus may also comprise an inspection device, located in the blow-molder, for inspecting the plastic container after formation by the blow-molder. The inspection device may comprise (i) two or more light energy sources for directing light energy from an exterior of the plastic container toward the plastic container after formation of the plastic container by the blow-molder, and (ii) two or more light energy sensors, each light energy sensor operatively associated with one of the light energy sources, wherein each light energy sensor is for sensing a portion of the light energy that passes through of the plastic container and generating a signal from the sensed portion of the light energy that passes through the plastic container that is related to the light energy absorbed by the plastic container. The apparatus may also comprise a transfer arm in the blow molder for transporting the plastic container along the transport path through the inspection device. The apparatus may also comprise a microprocessor in communication with the inspection device for (i) determining a container attribute of the plastic container based on the signals related to the light energy absorbed by the plastic container; and (ii) determining the mold involved in formation of the plastic container based on at least one signal received by the microprocessor.

Claims

1. An apparatus comprising:

a blow-molder comprising a plurality of molds and spindles for forming a plastic container from a preform;

an inspection device, located in the blow-molder, for inspecting the plastic container after formation by the blow-molder, wherein the inspection device comprises;

two or more infrared light energy sources for directing light energy from an exterior of the plastic container toward the plastic container after formation of the plastic container by the blow-molder, wherein a first of the light energy sources is at a first height level relative to the plastic container and a second of the light energy sources is at a second height level relative to the plastic container, wherein the first height level is different from the first height level;

two or more infrared light energy sensors, each light energy sensor operatively associated with one of the light energy sources, wherein each light energy sensor is for sensing a portion of the infrared light energy that passes through of the plastic container and generating a signal from the sensed portion of the infrared light energy that passes through the plastic container that is related to the infrared light energy absorbed by the plastic container;

a transfer arm in the blow molder for transporting the plastic container along the transport path through the inspection device; and

a microprocessor in communication with the inspection device for;

determining a container attribute of the plastic container based on the signals related to the infrared light energy absorbed by the plastic container; and

determining the mold involved in formation of the plastic container based on at least one signal received by the microprocessor.

2. The apparatus of claim 1, wherein the microprocessor is further for determining whether the container attribute is within desired limits based on the amount of infrared light energy absorbed by the container.

3. The apparatus of claim 2, further comprising a display in communication with the microprocessor for displaying information correlating the container attribute to the mold involved in forming the plastic container.

4. The apparatus of claim 1, wherein the microprocessor is further for determining the spindle involved in formation of the plastic container.

5. The apparatus of claim 4, further comprising a display in communication with the microprocessor for displaying information correlating the container attribute to the mold and the spindle involved in forming the plastic container.

6. A method of manufacturing a plastic container comprising:

forming the plastic container from a preform in a blow-molder, the blow-molder comprising a plurality of molds and spindles;

transporting the plastic container with a transfer arm along a transport path through an inspection station after formation of the plastic container by the blow-molder; and

inspecting the plastic container as it passes through the inspection station, wherein inspecting the plastic container comprises;

directing light energy from an exterior of the plastic container toward the plastic container from two ore more light energy sources on a first side of the transport path;

sensing with two or more light energy sensors a portion of the light energy that passes through two sidewalls of the plastic container, wherein each of the light energy sensors are operatively associated with one of the light energy sources, wherein the light energy sources and the light energy sensors are located in the blow-molder;

determining a container attribute of the plastic container based on the sensed portion of the light energy that passes through the two sidewalls of the plastic container that is related to the light energy absorbed by the two sidewalls of the plastic container; and

correlating the container attribute to a mold of the blow molder involved in forming the plastic container.

7. The method of claim 6, further comprising adjusting a parameter of the blow-molder based on the inspection.

8. The method of claim 6, further comprising displaying on a display information correlating the container attribute to the mold of the blow molder involved in forming the plastic container.

9. The method of claim 8, further comprising adjusting a parameter of the blow-molder based on the inspection.

10. The method of claim 6, further comprising correlating the container attribute to a spindle of the blow molder involved in forming the plastic container.

11. The method of claim 10, further comprising displaying on a display information correlating the container attribute to the mold and the spindle involved in forming the plastic container.

12. The method of claim 11, further comprising adjusting a parameter of the blow-molder based on the inspection.

13. The method of claim 6, further comprising:

determining whether the container attribute falls within preestablished limits; and

rejecting the plastic container when the container attribute does not fall within the preestablished limits.

14. The method of claim 6, wherein directing light energy comprises directing infrared light energy.

15. The method of claim 6, wherein directing light energy comprises directing light energy from at least first and second light energy sources, wherein the first light energy source is at a first height level with respect to the plastic container and the second light energy source is at a second height level with respect to the plastic container, wherein the first level is different from the second height level.