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Technical Note (For general use)

> Technical Note (For Pharmaceutical)

The Impact of Wind on Checkweighers and the Effectiveness of Windshield Covers

Similar to static scales and electronic balances, checkweighers are recommended for use in wind-free environments. However, in actual onsite conditions, airflow from air conditioning systems or wind entering from outside can affect weighing accuracy.
In this paper, we will reproduce this phenomenon through simulated experiments and explain the effect of a cover in mitigating wind influence.

Advanced Application of Missing Product and Shape Inspection using X-ray Inspection System

X-ray inspection devices are utilized in many fields as multitasking inspection machines that are capable of various types of inspections simultaneously, not limited to foreign object detection. Manufacturers of X-ray inspection systems use different terminologies, but the mechanism of detecting defective products by applying multiple image processing technology to x-ray images is the same.In the previous issue, we provided a basic introduction to missing product and shape inspection functions. In this issue, we explain in an advanced application how to approach making a close-to-accurate evaluation when selecting between two available functions for the same inspection purpose.

Basics of Missing Product and Shape Inspection using X-ray Inspection System

X-ray inspection systems are utilized in various fields as composite inspection machines that can perform multiple inspections simultaneously, not just foreign object detection. Different manufacturers of X-ray inspection systems use several terminologies, but the mechanism of applying multiple image processing techniques to detect defects in the transmitted image is the same.We offer about ten inspection functions related to missing items and product shapes, and we have been receiving more and more inquiries about which one to choose from among these options. This paper explains each function of our X-ray systems using actual examples. Regarding count detection, quantity detection, relative vir tual weight measurement, and shape inspection, we will look at which function to select based on the applications and the details to be inspected.

Measures to Prevent False Rejects in Metal Detectors: External Noise Part 2

In the previous technical note*, we explained false rejects in metal detectors caused by electrical noises such as radiation noise, conduction noise, and static noise. In this paper, we will focus on false rejects and countermeasures caused by two types of noises. One is the noise that occurs when metal parts of production equipment move within the magnetic field generated by the metal detector, and the other is the noise caused by electromagnetic induction occurring in peripheral equipment such as roller conveyors and packaging machines.

*Please refer to "Measures to Prevent False Rejects in Metal Detectors: External Noise Part 1".

Measures to Prevent False Rejects in Metal Detectors: External Noise Part 1

Did you know that a metal detector generates a magnetic field with an optimum frequency to accuratelydetect changes in the effects of the product being inspected when metal contaminants are mixed in and when they are not mixed in? Each metal detector manufacturer uses different setting procedures, but themechanism is the same to detect changes in the magnetic field that occur when a metal contaminant passes through a tunnel-shaped detection head (magnetic field tunnel). Anritsu metal detectors start operationafter first selecting a sensitivity mode, which is a combination of magnetic field frequencies with different characteristics. This paper explains about the sensitivity mode.

Why do sensitivity modes and estimated detection sensitivity change?

Did you know that a metal detector generates a magnetic field with an optimum frequency to accuratelydetect changes in the effects of the product being inspected when metal contaminants are mixed in and when they are not mixed in? Each metal detector manufacturer uses different setting procedures, but themechanism is the same to detect changes in the magnetic field that occur when a metal contaminant passes through a tunnel-shaped detection head (magnetic field tunnel). Anritsu metal detectors start operationafter first selecting a sensitivity mode, which is a combination of magnetic field frequencies with different characteristics. This paper explains about the sensitivity mode.

Tips for Effective Use of X-ray Inspection Systems: Noise Removal and Detection Limit

Anritsu X-ray inspection systems generate X-ray transmission images and set the contaminant detection limit after the product to be inspected is fed 10 times. The image is monochrome and the density changes depending on the amount of X-ray transmission. If the limit value is set in consideration of variations in the amount of X-ray transmission (shadow density) of PASS product, it is possible to make accurate OK/NG (PASS/FAIL) evaluation for the products conveyed one after another on the production line.

In contrast, when there are variations in production lots or in the conveyed conditions, etc., the change in the shade of the transmitted image becomes steeper than usual, and the peak of the waveform that indicates the change exceeds the detection limit (threshold) and may be falsely evaluated as a defective product. Such changes in product effect becomes noise. Since noise can be reduced by image processing, contaminant detection sensitivity can be maintained while suppressing frequent false rejections.

This paper explains how to make adjustment using the monitor screen of Anritsu X-ray Inspection System. Also, examples of applications that are prone to change in product effects (the cause of noise) will be introduced.

Is the choice of algorithm appropriate?

Most of X-ray inspection users in the food industry may not be so particular about choosing the algorithm (method) when setting the detection sensitivity as long as the in-house criteria (the type and size of test pieces to be detected) are satisfied. Wouldn't you be interested in trying a different algorithm if detection sensitivity surpassing the internal standards can be achieved?

Each product has characteristics such as overlap, steep edges, granularity, linear shape, etc., and image processing is performed to erase (reduce) the product effect. This is the "Contaminant Detection Algorithm", and by selecting the most suitable one for the product, the detection sensitivity can be improved. This can minimize complaints from consumers and business partners and strengthen quality assurance. In this paper, we will explain the difference in detection sensitivity due to the selection of the "Contaminant Detection Algorithm" using easy-to-understand examples.

Preventing false evaluation: Unifying the product orientation

A metal detector creates a magnetic field in its detector head and monitors a change in a magnetic field when a product passes it through. When the signal exceeds the set value (threshold), it evaluates the change as a metal contamination.

This time, we explain how the direction in which the product enters the detector head changes the product effect value and evaluation for PASS/Defective products.

Is the product fed properly when performing the auto-setting?

Metal detectors are widely used from raw materials to final processes for the purpose of detecting metal contaminants in foods, pharmaceuticals, industrial products, etc. To keep the standards for food safety, product quality managers are required to perform the sensitivity settings correctly when using the metal detectors. Our customer support center frequently receives inquiries from customers using our metal detectors that they cannot meet the in-house standards of sensitivity and that there are many malfunctions on site.

This paper explains the correct way of feeding the product when performing the auto-setting. By identifying the cause of the problem, proper measures can be taken.

Why do seal defects occur?

In product packaging process, a part of the product content is sometimes pinched and caught in the sealing area.
This white paper explains why seal defect matters and how it's caused.
Seal Inspection function with X-ray inspection system is very effective in eliminating products with seal defect.

Tips for Effective Use of Checkweigher: The Photocell Error

Product inspection equipment use photoelectric sensors that identify each product to be inspected when it is conveyed. Anritsu's customer support center often receives phone calls from our customers regarding the photocell errors. In many cases, these errors can be prevented by proper cleaning and regular inspection.
This paper explains typical causes of the errors and countermeasures, while explaining different types of photoelectric sensors.

Tips for Effective Use of Checkweigher: A Zero-Set Error

Checkweigher automatically adjusts the system to indicate zero gram when there is no product on the weighing conveyor. However, Auto Zero sometimes fails due to several reasons like big change in temperature and humidity at the production plant, draft from an air conditioner, floor vibrations, etc. This paper explains measures for a zero-set error when using a checkweigher.

Cleaning and Maintenance on X-ray Inspection Systems That Can Be Easily Missed.

Generally, cleaning of production equipment prevents the growth of bacteria from food residue and stains. In terms of X-ray inspection system, proper cleaning also eliminates the cause of false rejects and extends the service life of the equipment. In addition, regular performance validation and maintenance provides a lot of important benefits.

This paper explains about cleaning and maintenance which users tend to overlook.

Metal Detector-Method for Fixing Test Pieces during Sensitivity Check

Those who use a metal detector can perform a sensitivity check by attaching a test piece on a product prior to the start of production. Detection of test pieces by the metal detector would vary depending on which position of a detection head (the tunnel where a magnetic field is generated) test pieces pass through. This paper will explain how the detection of test pieces vary and how to fix a test piece on a sample product.

What is Relative Virtual Weight by X-ray Inspection Systems?

Have you heard of the relative mass measurement by x-ray inspection systems? Many of you may wonder why x-ray systems can virtually measure product weight. Relative mass is the value which the difference of density between x-ray images of the reference master product and the inspected product is converted into the mass. This paper explains the principles of the relative virtual weight measurement, usage, and cautions.

What is Algorithm for X-ray Inspection Systems?

Have you heard the word "algorithm"? You may have heard of algorithm but most of you may never handle it by yourself and leave it to your serviceperson. This paper explains what algorithm is as well as both advantages and disadvantages of finding different algorithms.

Checkweighers' Double Product Error and Improved Productivity

When using a checkweigher, you may have experienced a sudden occurrence of a double product error. Frequent double product error can decrease productivity. This paper will focus on the error and propose a solution.

Quality Control with the Use of Checkweighers

The primary purpose of a checkweigher is to measure the weight of products and reject unacceptable under or overweight products. In addition to measuring product weight, checkweighers can be also used for quality control purposes. This paper introduces how to improve the quality of your product using a histogram.

Checkweigher and weighing accuracy

A checkweigher is widely known as an automatic machine that che cks the weight of items as they pass through a production line. Y ou may have one at your facility but if yours is not appropriate for your production line, it may undermine producti on efficiency. There are various technical parameters for a checkweigher including weighing rang e, conveying capacity, measurement accuracy and scale interval, among which this paper explains measurement accuracy along with basic functions of a checkweigher.

Phase and Auto Tracking - Countermeasures Against False Detection Vol.3 -

Technical Note Vol.4 took up product effect as a factor contributes to false detection of metal detector, and introduced Auto-Tracking function of Anritsu duw metal detector, which prevents false detection by compensating for phase shift caused by product effect. This issue will explain what phase is all about and how Auto-Tracking function works on phase.

Tips for Effective Use of Metal Detectors - Countermeasures Against False Detection Vol.2 -

Last time we introduced factors in external environment that affect metal detector performance. This time we feature another factor, product effect.

Tips for Effective Use of Metal Detectors - Countermeasures Against False Detection -

Metal detectors are the most commonly used equipment for contaminant detection. Yet many users face "false detection". In this issue we explain the causes and solutions of "false detection".

Usage of Metal Detector and X-Ray Inspection System Together Recommended

Metal detectors and X-ray inspection systems are widely used for contaminant inspection. Is a metal detector alone sufficient enough? Can an x-ray inspection system detect all types of contaminants? Let's see how these two systems detect contaminants.

X-ray Inspection System Bulk Product Inspection

Bulk product inspection by x-ray inspection systems are always receiving significant attention in exhibitions. How is this system different from others? What products are ideal for the inspection? Let us explain the outline and look at the possibilities.

> Technical Note (For Pharmaceutical)