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This section provides an overview for pinhole inspection machines as well as their applications and principles. Also, please take a look at the list of 6 pinhole inspection machine manufacturers and their company rankings. Here are the top-ranked pinhole inspection machine companies as of August, 2025: 1.Jornen Machinery Co., Ltd., 2.Pelen Pte Ltd., 3.SANKO ELECTRONIC LABORATORY CO.,LTD.
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Categories Related to Pinhole Inspection Machines
A pinhole inspection unit is a machine that inspects packaging materials for pinholes. A pinhole is a hole the size of a needle in a packaging material, or a very small hole on a painted surface of an exterior wall after construction, as if an air bubble has collapsed.
The characteristics of pinholes are that they can be inspected in a nondestructive state, which facilitates re-inspection and pursuit of the cause of defects, and that they can be inspected even when bubbles are present in the product.
There are also pinhole inspection units that can even pinpoint the location of pinholes.
Pinhole inspection units are used in the manufacture of products that are familiar to us in our daily lives. For example, they are used in the manufacture of food products that contain a lot of liquid, such as jelly, pudding, milk cartons, sausages, etc.
In addition to food products, it is also used in the manufacturing process of household products such as detergent, toothpaste, and shampoo, as well as in the packaging of blood and infusion solutions used in the medical field and in the packaging of eye drops.
However, as will be discussed in more detail below, the principle may not be applicable to packaging materials with low insulation properties and low conductivity contents.
Pinhole inspection units are designed to determine the presence or absence of pinholes by occurrence or absence of electrical discharges when high voltage is generated in a circuit with electrodes placed at a certain distance from each other.
Normally, the air between two electrodes placed far apart is destroyed when the voltage of the high-voltage generator connected to both electrodes is gradually increased, resulting in a discharge phenomenon that causes the loss of electrical insulation. Plastics used for packaging materials generally have higher insulation properties than air and can withstand stronger voltages (dielectric breakdown voltage) than air can be destroyed, and no electrical discharge phenomenon occurs when a product without pinholes is passed between the electrodes. However, when a product with pinholes is passed through the electrodes, the insulation withstand voltage causes a discharge, which can be detected by the detector by sensing the change in electric current.
For products that are filled with gas to maintain quality, a type of inspection unit that checks for pinholes by detecting gas above a standard concentration is used.
There are different types of pinhole inspection units, including discharge-type inspection, which inspects for the presence or absence of electrical discharge due to high voltage, each of which corresponds to the material and characteristics of the item to be inspected.
The main types of pinhole inspection include the following:
Pinhole inspection units use cameras and image processing equipment, and automate the process of inserting gas. Pinhole inspection equipment can accurately perform inspections that are limited by visual checks.
Pinholes can be caused by small impacts on sheet materials such as paper and film, such as when they are caught on an overhang or by friction due to vibration during transportation. In welded metals, pinholes can also be caused by a decrease in gas solubility or gas entrapment.
If pinholes are left unattended, corrosion can start from the pinholes and lead to damage to the object. In the case of containers, the contents may leak out, or conversely, contaminants may enter the container from the outside and affect the contents.
Therefore, even the slightest pinhole must be detected, and pinhole inspection units play an important role.
*Including some distributors, etc.
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Jornen Machinery Co., Ltd., founded in 1989 by Mr. Yang Yijun is a manufacturer of pharmaceutical processing and packaging equipment and machinery headquartered in Songjiang, Shanghai, China. The company offers various products including blister, film coating, capsule & tube filling, tablet press, and thermoforming packaging machines. The company, which has been named as one of the “Top 10 Packaging Machinery Enterprises” in China, and the “Shanghai High-Tech Enterprise” award offers equipment to meet its customers’ requirements that come from various sectors including the pharmaceutical, food, cosmetic and chemical industries.
Nikka Densok Limited, founded in 1978, is a manufacturer of inspection equipment headquartered in Kawagoe City, Saitama. It specializes in producing and selling a range of products, including metal detectors, weight sorters, pinhole inspection equipment, as well as magnet iron removal equipment, and security equipments such as handy high sensitivity metal detector and gate metal detector. The company offers a rental service of its numerous equipments, and also has several branches all over Japan, and some of which are in Osaka, Nagoya, Kyushu, and Hokkaido.
Hamamatsu Photonics K.K., established in 1953 and headquartered in Hamamatsu, Japan, is a manufacturer of sensors and emitters for both visible and invisible light. It stocks products like LEDs, lamps, and photodiodes used in several industries, including consumer electronics, dental imaging, and environmental monitoring. The sensor and light source components are also available as modules and units that can be incorporated into systems the company develops, like optical measurement systems or imaging systems. The ISO 9001-certified company stocks over 15,000 devices, units, and systems that ship to over 100 destinations worldwide, and it has ten research and production bases.
SANKO ELECTRONIC LABORATORY CO.,LTD, established on August 1, 1963, and based in Kawasaki, Kanagawa, is a manufacturer and supplier of gauges and testing instruments. The company's product range includes Coating Thickness Meters, Moisture Meters, Pinhole Detectors, Needle Detectors, and Iron Piece Detectors. These instruments are used for measurements in various processes to ensure product quality. Industries such as manufacturing, electronics, construction, and safety use these products. In addition to manufacturing, the company offers services like customer support, product development, after-sales support, and client-specific solutions.
Yenchen Machinery Co., Ltd., established in 1967, is based in Taoyuan, Taiwan, as a manufacturer and supplier of pharmaceutical machines. It specializes in manufacturing pellet and coating machines, high-shear mixers, and solid dosage lines. Its products are equipped with HEPA filters and thermal ristribution instruments to ensure product quality. Its manufactured products are utilized in pharmaceutical, food, biotechnology, chemical, and cosmetic sectors across Europe, America, Africa, and Southeast Asia. The company has partnered with several companies, such as Pfizer, Novartis, Boehringer Ingelheim, and Daiichi-Sankyo. It acquired ISO 9001:2015 certification and received the Honorable Mention Award in Intelligent Product Competition in 2023.
Ranking as of August 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Jornen Machinery Co., Ltd. |
25.4%
|
| 2 | Pelen Pte Ltd. |
22.5%
|
| 3 | SANKO ELECTRONIC LABORATORY CO.,LTD |
16.9%
|
| 4 | NIKKA DENSOK LIMITED |
14.1%
|
| 5 | Yenchen Machinery Co., Ltd. |
12.7%
|
| 6 | Hamamatsu Photonics K.K. |
8.5%
|
Derivation Method
The ranking is calculated based on the click share within the pinhole inspection machine page as of August 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
Japan
|
3 | 50.0% |
|
China
|
1 | 16.7% |
|
Taiwan
|
1 | 16.7% |
|
Singapore
|
1 | 16.7% |
18 products found
18 products
TAKENAKA SYSTEM CO.,LTD.
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overview This is a defect detection device that can be connected to the TLC-7300UCL of the Camera Link output color line scan camera with our high-...
TAKENAKA SYSTEM CO.,LTD.
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overview ･ It is a defect detection device for line scan cameras for high -speed and high -resolution. ･ It can be connected to a Camera Link outpu...
Sensor Technology Co., Ltd.
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■Summary - A pinhole detector used to inspect pinholes in coatings and linings (painted films, resins, rubber, and other insulating materials) on v...
Sensor Technology Co., Ltd.
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■Summary - A pinhole detector used to inspect pinholes in coatings and linings (painted films, resins, rubber, and other insulating materials) of v...
SANKO ELECTRONIC LABORATORY CO.,LTD
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As an example of a high -voltage discharge pin hole checker, we will introduce film and sheets. The sheet composition container may cause pinholes...
Accurex Co., Ltd.
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There are two types of inspection parts: percussion method (A) and proximity sensor method (P). ■Features ・Stores up to 99 types of product setup...
Accurex Co., Ltd.
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■Features ・Press a can or resin container lightly with a side belt, measure the repulsive force with a load cell, and select good or defective pro...
Accurex Co., Ltd.
280+ people viewing
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■Features ・Press a can or resin container lightly with a side belt, measure the repulsive force with a load cell, and select good or defective pro...
MUTUAL CORPORATION
280+ people viewing
Last viewed: 2 hours ago
■Features - Since defective products are not destroyed by inspection equipment, it is easy to re-inspect defective products and find the cause of t...
MUTUAL CORPORATION
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■Features Torerude is a non-destructive pinhole inspection machine for hermetically packaged products in the food industry, such as liquid soups, s...
FUKUDA CO., LTD.
110+ people viewing
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This is a pseudo defect with specified hole diameter and hole length. It can be used for pressure change leak test method and liquid immersion test...
Nidek Power Train Systems
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Auto -visual inspection such as burrow, mushrooms, peeling, burrs, and contact It is a device that performs the grinding surface of the casting pr...
Fukase Shoji Co., Ltd.
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The PDC-F inline pinhole detector is a device that safely and reliably detects pinholes in moving films and sheets. Fault sensors for defect detect...
F.I. Tech Co., Ltd.
210+ people viewing
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For finding pores, voids, cracks and inclusions in enamel, lacquer, rubber and bituminous linings and coatings, as well as glass fiber reinforced p...
Shibata Engineering Co., Ltd.
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■Desktop type inspection device ideal for 100% inspection ・Press the tube with constant pressure to ensure puncture inspection. ・This is a tablet...
