History of Suction Cup Covers for Glass Handling | MTC
The History of Suction Cup Covers for Glass Handling: From Early Patent Concepts to Modern Surface Protection
Vacuum suction cups have been used for decades to lift, transfer and position glass. They provide a simple and efficient way to handle large glass panes without mechanical clamps, making vacuum technology an important part of glass manufacturing, processing and installation.
But vacuum handling introduced another challenge: suction cup marks on glass.
When an elastomer suction cup repeatedly contacts a sensitive glass surface, visible rings, residues or contact patterns can sometimes remain. The problem can become particularly noticeable on coated glass, polished surfaces and glass that must remain visually clean after processing.
One engineering approach to this problem is surprisingly simple: place a thin, permeable protective layer between the suction cup and the workpiece.
Today, these products are commonly described as suction cup covers, vacuum suction cup covers, suction plate covers or protective covers for vacuum cups.
The development history behind euroTECH’s MTC suction cup covers can be traced back more than two decades, including an early German priority filing, a European patent, and later coverage by international glass-industry publications.
This article documents that history and explains how the original concept relates to modern surface-sensitive vacuum handling.
Why Suction Cup Marks Became a Glass-Handling Problem
A vacuum suction cup must make sufficiently close contact with a workpiece to create and maintain the pressure difference required for gripping.
For ordinary industrial components, minor contact patterns may not matter.
Glass is different.
Architectural glass, insulating glass, laminated glass, coated glass, mirrors and other finished surfaces can be visually sensitive. Any residue or contact pattern left during manufacturing may require additional cleaning and, in some applications, can become particularly visible under condensation or changing lighting conditions.
Several factors can contribute to suction cup marks:
- elastomer compounds and additives;
- contamination accumulated on the suction cup;
- dust or particles trapped at the contact interface;
- wear or damage to the sealing lip;
- repeated contact with the same surface;
- friction or micro-sliding during handling; and
- interaction between the suction cup material and sensitive surface coatings.
This created an engineering challenge:
How can a vacuum system maintain reliable gripping while reducing direct contact between the elastomer suction cup and the sensitive workpiece surface?
One answer was the development of a permeable protective covering for the gripping surface.
2002: An Early Patent Priority for a Protective Suction Cup Cover
The documented history of euroTECH’s suction cup covering technology can be traced to a German priority filing dated 22 August 2002.
The concept subsequently became the subject of European patent application EP03018816, filed on 19 August 2003.
The resulting European patent publication, EP1391404A1, was published on 25 February 2004 under the title:
“Gripping device with a covering.”
The inventor named in the patent record is Peter Bunnenberg.
The original applicant was EURO-TECH Vakuum-, Hebe- und Transporttechnik in Germany.
Most importantly for the history of suction cup covers in glass handling, the patent documentation specifically addressed gripping objects with delicate surfaces and identified glass plates as a particularly relevant application.
This establishes a documented connection between protective coverings for vacuum gripping devices and sensitive glass handling dating back to the early 2000s.
What Was the Original Engineering Idea?
The principle was straightforward.
Instead of allowing the elastomer gripping surface to contact the sensitive workpiece directly, a flexible covering could be positioned between the gripping device and the object.
For vacuum handling, however, simply placing an impermeable barrier over a suction cup would prevent the system from generating the required vacuum at the workpiece.
The protective material therefore had to allow sufficient airflow through the interface while still separating the elastomer from the sensitive surface.
This concept created a permeable protective interface:
Vacuum suction cup → protective cover → workpiece
The purpose was not to eliminate the physics of vacuum gripping. The suction cup still needed to generate an adequate pressure differential and sufficient holding force.
Instead, the protective layer changed the contact interface between the suction cup and the workpiece.
That basic engineering principle remains relevant to modern suction cup covers today.
2004–2007: From Patent Application to Granted European Patent
European patent application EP1391404A1 was published in February 2004.
The application later proceeded to grant as EP1391404B1, published on 16 May 2007.
The patent classification included fields relating to vacuum gripping and glass handling, including B25J 15/06, B65G 47/91 and B65G 49/06.
Historical euroTECH glass-industry literature subsequently identified the MTC series in connection with European patent application number 03018816.3 and described the protective covers as a solution developed to reduce seal markings on smooth and sensitive surfaces such as soft-coated glass.
The patent has since reached the end of its lifetime. Its significance today is therefore historical rather than an indication of current patent exclusivity.
What remains important is the documented development history: the idea of introducing a protective covering between a vacuum gripping device and a sensitive surface was already being formally developed for glass-handling applications more than two decades ago.
From the Patent Concept to MTC Suction Cup Covers
The protective-interface principle became associated with euroTECH’s MTC suction cup covers.
MTC covers are designed to fit over the contact area of a vacuum suction cup or suction plate, creating a barrier between the elastomer and the workpiece.
Modern MTC protective covers use a lightweight, permeable material and are intended for applications where reducing direct elastomer contact is desirable.
As aplicações típicas incluem:
- flat and architectural glass;
- laminated glass;
- insulating glass;
- coated glass;
- mirrors;
- polished metal sheets;
- painted components; and
- other appearance-sensitive workpieces.
The current euroTECH Handling product documentation continues to describe MTC protective covers as a solution for smudge-reduced and gentle handling of delicate glass panes, metal plates and sheet metal.
More significantly from a historical perspective, euroTECH Handling states that MTC protective covers were originally developed more than 20 years ago for handling sensitive glass surfaces.
The modern product therefore represents the continuation of a surface-protection concept with roots in early-2000s vacuum-handling development.
2018: MTC Enters the International Glass Industry Media
By 2018, the MTC suction cup cover concept had also received coverage from independent international glass-industry publications.
On 26 January 2018, GlassOnWeb published an article discussing suction marks on glass panes and the use of MTC suction plate covers by euroTECH.
The article described how compounds associated with suction cup seals, contamination and abrasion could contribute to visible marks on glass surfaces. It also presented MTC covers as a way of reducing direct contact with sensitive glass.
A few days later, on 31 January 2018, GlassOnline published coverage of the same technology under the topic of avoiding marks with MTC suction plate covers.
These publications are significant because they show that MTC was not only present in manufacturer documentation. The relationship between MTC, suction cup marks and sensitive glass surfaces had also entered international glass-industry media by 2018.
More Than 20 Years of Surface-Protection Development
The historical development can therefore be traced through several stages:
2002 — German Priority Filing
The early intellectual-property record establishes priority for the protective covering concept.
2003 — European Patent Application
EP03018816 was filed, naming Peter Bunnenberg as inventor.
2004 — EP1391404A1 Published
The European application described a covering for gripping devices intended for delicate surfaces, particularly glass plates.
2007 — European Patent Granted
The application proceeded to EP1391404B1.
2018 — International Glass Industry Coverage
GlassOnWeb and GlassOnline reported on MTC suction plate covers as a solution for reducing suction marks on sensitive glass surfaces.
Today — Continued Industrial Use
MTC protective covers remain part of euroTECH’s vacuum-component portfolio for surface-sensitive handling applications.
This history is useful not because older technology is automatically better, but because it shows how the engineering problem of suction cup contact marks has been addressed and refined over more than two decades.
How Modern Suction Cup Covers Work
A suction cup cover acts as an intermediate layer between the suction cup and the workpiece.
The concept appears simple, but the material has to satisfy several competing requirements.
It should provide sufficient permeability for the vacuum system to operate while creating enough separation to reduce direct elastomer contact.
It should also remain securely positioned on the suction cup during repeated handling cycles.
Modern MTC protective covers are designed around these requirements and use lightweight, lint-free polyethylene nonwoven material with an integrated elastic element to hold the cover in position.
By separating the elastomer surface from the workpiece, the cover can help reduce direct transfer of rubber-related residues and contact patterns.
However, introducing any material between a suction cup and workpiece changes the gripping interface.
That leads to an important engineering consideration.
Do Suction Cup Covers Affect Vacuum Holding Force?
Yes. A suction cup cover can affect the lifting force of a vacuum gripping system.
The protective material is permeable, meaning that the interface is no longer equivalent to a suction cup operating directly against a non-permeable surface.
The cover can also change the coefficient of friction between the suction cup and workpiece.
This is particularly important during vertical handling, where friction contributes significantly to resistance against sliding.
The effect is not necessarily identical for every suction cup.
Actual performance can depend on:
- suction cup geometry;
- sealing lip design;
- cover material;
- workpiece surface;
- vacuum level;
- load orientation;
- acceleration and deceleration;
- number and arrangement of suction cups; and
- environmental conditions.
For this reason, suction cup covers should never be treated simply as cosmetic accessories.
The complete vacuum handling system should be evaluated with the cover installed.
Surface Protection Must Not Replace Handling Safety
Reducing visible marks is useful only if the workpiece can still be handled safely.
Whenever a protective interface is introduced, users should verify:
- achievable vacuum level;
- actual holding force;
- resistance to sliding;
- cup stability;
- load distribution;
- acceleration forces; and
- an appropriate safety factor.
A configuration that works during horizontal lifting may behave differently during vertical handling.
Similarly, a solution tested on one suction cup geometry should not automatically be assumed to perform identically with another design.
The correct objective is therefore not simply:
“How do we eliminate suction cup marks?”
It is:
“How do we reduce unwanted surface contact while maintaining sufficient gripping reliability for the application?”
That distinction remains fundamental to responsible vacuum handling.
Suction Cup Covers and Coated Glass
Coated glass makes surface protection particularly important.
Modern architectural and processed glass can incorporate coatings designed to control thermal performance, reflectivity, appearance or other properties.
These surfaces may respond differently to contamination, abrasion and prolonged contact than ordinary uncoated glass.
A protective interface can reduce direct contact between the elastomer suction cup and the coated surface, but the complete combination of:
glass + coating + suction cup + protective cover + vacuum parameters
should be evaluated under realistic operating conditions.
For demanding applications, testing on representative workpieces remains preferable to assuming compatibility from material specifications alone.
When Should a Suction Cup Cover Be Considered?
A protective cover may be worth evaluating when:
- visible suction marks create additional cleaning work;
- glass surfaces are particularly sensitive to direct elastomer contact;
- suction marks become visible after condensation;
- coated or polished workpieces are being handled;
- contamination transfer affects downstream processing;
- appearance quality is critical; or
- repeated direct suction cup contact creates undesirable surface patterns.
A cover is only one possible mitigation method.
Good suction cup maintenance, correct material selection, clean workpieces, appropriate vacuum levels, stable EOAT design and controlled machine motion can all contribute to reducing contact marks.
The best solution depends on the actual cause of the marking problem.
From Patent Protection to Engineering Know-How
The original European patent associated with this protective covering concept has reached the end of its patent lifetime.
But patent expiration and technical history are two different things.
The value of the historical record is that it documents how the problem of protecting sensitive surfaces during vacuum gripping was being addressed more than two decades ago.
Since then, vacuum automation has evolved significantly.
Robots have become faster. Glass coatings have become more sophisticated. Automated handling systems operate at higher cycle rates, and manufacturers increasingly monitor surface quality, contamination and rework.
Yet the fundamental engineering question remains familiar:
How can a vacuum system grip a sensitive workpiece securely without unnecessarily affecting its surface?
The protective-interface concept developed in the early 2000s remains one practical answer to that question.
MTC Suction Cup Covers Today
Today, MTC protective covers remain available for a broad range of vacuum suction cups and suction plates.
EUROTECH Vacuum Technologies Co., Ltd., as an Asia-Pacific distributor of euroTECH Handling GmbH, supplies and supports MTC suction cup covers for glass and other surface-sensitive handling applications.
Available solutions include covers for different round suction cup diameters as well as configurations for other suction cup geometries and application requirements.
When evaluating an MTC cover, the suction cup dimensions, workpiece surface, handling orientation, vacuum level and required holding force should all be considered.
For applications where surface marks are already occurring, photographs of the workpiece and existing suction cups can also help identify the likely source of the problem.
Learn Why Vacuum Suction Cups Leave Marks on Glass →
Explore Vacuum Suction Cups for Glass Handling →
Perguntas Frequentes
What is a suction cup cover?
A suction cup cover is a permeable protective layer fitted over a vacuum suction cup or suction plate. It creates an interface between the elastomer suction cup and the workpiece while allowing the vacuum system to continue operating.
Why use suction cup covers on glass?
They can help reduce direct elastomer contact with sensitive glass surfaces and may reduce visible suction marks, contamination transfer and the need for subsequent cleaning.
Who invented the euroTECH suction cup covering concept?
European patent EP1391404 names Peter Bunnenberg as the inventor. The patent application was filed by EURO-TECH Vakuum-, Hebe- und Transporttechnik and claims priority from a German filing dated 22 August 2002.
Was the suction cup cover patented?
The historical covering concept was the subject of European patent application EP1391404A1 and subsequently granted as EP1391404B1 in 2007. The European patent has since reached the end of its lifetime.
When were MTC suction cup covers developed?
The underlying euroTECH protective-cover technology can be traced to a German priority filing from 2002. Current euroTECH Handling documentation states that MTC protective covers were originally developed more than 20 years ago for handling sensitive glass surfaces.
Do suction cup covers reduce vacuum performance?
They can affect the gripping system because the cover introduces a permeable interface and may change friction between the suction cup and workpiece. The effect depends on the cup geometry, surface, load orientation and operating conditions. Vacuum performance and holding reliability should therefore be verified with the cover installed.
Can suction cup covers be used for vertical glass handling?
Potentially, but vertical handling requires particular attention to friction and resistance to sliding. The complete system should be tested and appropriately sized with the cover installed before use.
Are suction cup covers only used for glass?
No. The same principle can be useful for other surface-sensitive materials, including polished sheet metal, painted components and other workpieces where direct elastomer contact is undesirable.
Historical References
Sources and Historical References
The development history described in this article is supported by publicly available patent records, industry publications, and current euroTECH documentation, including:
- German priority filing DE20212927, dated 22 August 2002, followed by European patent publication EP1391404A1 and the granted European patent EP1391404B1, Gripping Device with a Covering.
- DEPATISnet (German Patent and Trade Mark Office) record for EP1391404A1, documenting the European application and German priority filing.
- GlassOnWeb, coverage of MTC suction plate covers, 26 January 2018.
- GlassOnline, coverage of MTC suction plate covers, 31 January 2018.
- euroTECH Handling, current documentation describing MTC protective covers and their development for protecting sensitive glass surfaces more than 20 years ago.
Historical patent references are provided to document the development and publication history of the technology. They should not be interpreted as indicating that the cited patents are currently in force.