Due to an overwhelming interest for our Powders & Granules course, we are now setting up a 2nd edition of the course in order to accommodate all the applicants !
The original edition of this 2 days’ course will still take place on November 24 and 25, 2021.
The 2nd edition will be scheduled on December 22-23, 2021.
As we write this post, there are still a few spots left and we will treat new subscriptions on a first come first serve basis.
Further information on the Powders & Granules course can be found on this page.
As of October 1st of this year, all powder mixtures containing at least 1% titanium dioxide (TiO2) particles with an aerodynamic diameter less than ten micrometers (10 µm) are to be marked with a mandatory warning label. This warning is to indicate to the users the risk of respiratory effects of dust particles or droplets, as found in the regulatory EUH211 and the EUH212. With the now published regulation, it will be legally binding to make labeling amendments to every mixture that contains more than 1% TiO2. Industry associations are already advising their members to start relabeling at the earliest opportunity.
A key parameter is the aerodynamic diameter that is not easy to assess. The EN 15051 standard is an internationally accepted standard that determines the dustiness potential of powders and granular material providing information on the inhalable, thoracic and respirable fraction. Within Delft Solids Solutions we have amended this EN 15051 dustiness measurement in a way that we can also quantify the fraction of particles with aerodynamic diameter < 10 µm. The latter is also in line with the new regulations and ECHA and REACH requirements.
Further information on the EN 15051 rotating drum methodology can be found on this page.
We will organize the previously-postponed seminar Mixing & Segregation on Tuesday November 17, 2020!!
In contrast to the currently-organized webinars and on-line meetings, the Mixing & Segregation seminar will be a traditional physical event, though the number of participants will be restricted due to the COVID-19 guidelines. This edition of the seminar will therefore not include the highly interactive and characteristic case studies. Instead, we have scheduled two additional expert lectures in the program. Thus it promises to become a highly informative event on an actual topic of powder mixing.
The program of the seminar and information on location and subscription can be found on the Mixing & Segregation web page.
We are very pleased that Delft Solids Solutions’ proposal is in the TOP 3 of Innovations as judged by the NENnovation award jury and as such we have made it to the FINAL.
The NENnovation award is awarded to an innovation/product that is judged on the following items:
- The innovative character
- The social relevance – which problem does it solve and what does it respond to?
- The technical feasibility and protection
- The economic aspects
- The link with standards / normalization
Out of numerous 5 minutes’ video pitches, the jury has selected 3 Innovations that will proceed to the final. We are proud that Delft Solids Solutions’ innovation the NANOdrum is one of them.
At this stage we cannot give further details but please keep following us until October 16th, when the winner of the award is being announced during the celebration of the Worlds Standards Week.
In these hectic times of the COVID-19 virus, we as Delft Solids Solutions still would like to serve our customers as best as we can.
We strive to execute your project with the usual dedication and turn-around times and we have health and safety of our employees and customers on top of our priority list. While keeping the advised social distance of at least 1.5 meter and enabling sufficient desinfection units, we can proceed with our work and dedication.
Please let us know when you have questions about availability and possibilities…
On Tuesday May 26 2020, Delft Solids Solutions will organize its annual seminar, this time devoted to Mixing and Segregation of powders.
We have been working hard to construct an attractive program, which is a nice blend of equipment related information, experimental, prediction, and modelling contributions.
The program can be found on the following page:
On December 10-11, the SciFora will organize the Blending & Segregation conference in Enschede, The Netherlands.
This 2-day conference is devoted to the theoretical and experimental aspects of blending and segregation. Delft Solids Solutions is sponsoring this event.
On Wednesday December 11, Patrick Verolme will deliver a podium presentation on the practical aspects of segregation testing.
Prior to the conference, on Monday December 9, an interactive workshop will be organized during which our colleague Patrick Verolme will also present a short contribution.
During these 3 days, Delft Solids Solutions will also be present with a booth to discuss with you the possibilities of cooperation on this intriguing theme.
More information on the event and registration options can be found here.
On Tuesday October 22, 2019, we’ll organize our first powder hands-on day.
During this highly interactive event, we will actively work with participants on various instruments devoted to powder and particle characterization. In this way, you learn how to practically use various techniques and you understand the challenges associated with using these instruments and methodologies to determine different powder and particle properties.
In contrast to our courses and seminars, in the hands-on day we will spend most of the time in the laboratory. We will treat measuring particle size, investigating particle shape, analyzing the surface area of materials, determining the pore size distribution and the porosity and also working on quantification of the dustiness of materials.
Please keep an eye on our dedicated web page for this new event!
We are more than pleased to inform you that we have the full lecture program for the Particle Engineering day 2019 available.
The seminar will be organized on Tuesday May 21, 2019 in the Wings World Hotel in Rotterdam.
In the upcoming seminar, we have scheduled additional lectures in order to cover more disciplines and to make the event attractive to a wider audience. Many thanks to our own team and people from Kreber B.V., GEA Process Engineering (Denmark), TUDelft, Nouryon, IP&D Experts, Alcami Corporation, Technobis Crystallization Systems, and Batenco for their valuable contributions to this seminar.
We look forward to fruitful event; please find the program at the web page devoted to this seminar.
The Partec congress, held in Nuremberg on April 9-11 2019, is one of the major congresses on particle and bulk solids technology.
We are pleased to announce that Delft Solids Solutions got accepted an oral presentation devoted to stickiness assessment of powders by means of an advanced powder rheometer methodology developed in close cooperation with Anton Paar, Graz (Austria).
The lecture entitled: “Real-time in-situ Rheological Assessment of Sticky Point Temperature and Humidity of Powdered Products” will be presented on Thursday 11 April 2019 from 15:40 – 16:00.
We have all worked hard to get all the lectures and speakers available that we have now in our program, but we succeeded! The program for the Size Reduction and Classification day 2018 is now available.
Many thanks to our own team and people from Bühler Benelux/Switzerland, Hosokawa, Laarmann, DSM/TUDelft, Jacobs Douwe Egberts and Aspen Oss B.V. for their valuable contributions to this seminar.
On October 11, 2018, The Dutch Zeolite Association will organize its bi-annual Symposium devoted to materials development and in particular the synthesis, characterization, and applications of zeolites and related materials, such as ordered mesoporous materials and metalorganic frameworks.
The symposium will take place in Eindhoven and the invited plenary speaker for this DZA day will be Prof. Avelino Corma, from ITQ, Valencia (Spain).
Delft Solids Solutions will be one of the sponsors of this symposium and among other things will be responsible for the poster prizes awarded during this event.
More information on the symposium and subscription information can be found in this flyer in pdf format.
Meanwhile, as a sister organization of the the Dutch Catalysis Society of the KNCV, a web page on the Symposium is now available here.
We are currently setting up our next seminar that will be organized on Tuesday October 30, 2018 in the Wings World Hotel in Rotterdam.
The theme of the seminar concerns SIZE REDUCTION of solids and granules and CLASSIFICATION of the desired particle size.
Lectures will be devoted to different types of size reduction devices and the associated milling mechanisms and also on practical applications in food and pharma.
Please keep an eye on the respective web page for more information on presentations and the final program.
Please check the website now for the final program of our seminar on the topic of Powder and Particle Characterization. The link will open in a new window.
The seminar will be organized on May 22nd, 2018 at the Wings World hotel in Rotterdam.
Subscription to the seminar can from now on also be arranged on our website.
Segregation of powders may severely affect the quality of intermediate and final products.
Besides the two existing standard test methods, Delft Solids Solutions now has available a new prototype for testing the segregation tendency of very small amounts of powder blends in line with existing literature. The test is very well applicable for costly powders e.g. pharmaceuticals but also for food and feed powders and supplements, e.g. when only a minor amount of sample in available.
The technique is based on horizontal and vertical mechanical vibrations, which causes rolling, sliding, bouncing, percolation, and lateral and transverse movement of the particles. Besides quantification of the segregation tendency based on density and particle size, segregated lots will be available for further physical or chemical assay.
Every year the Dutch Working Party on Drying (NWGD) organizes the annual NWGD symposium about drying technology. During the symposium, speakers from companies, knowledge institutes and academia will present latest developments & innovations in the area of industrial drying, share challenges encountered in practice and strategies to optimize drying operations.
In this 2017 edition, organized November 28th in Wageningen, Delft Solids Solutions has been invited to contribute to the symposium program. The lecture is entitled “Solid(s) Characterization – Understanding and Improving Your Product and Process” emphasizing the importance of knowing about particle and powder properties that can impact on the drying process and the performance of the final product obtained.
More information on the agenda and the program can be found under this link…
Course Powders & Granules – Physical Properties and Behaviour
The course Powders & Granules will be organized on November 15-16, 2017 at our premises in Wateringen.
In this 2-days’ course topics like granulation, powder flow behaviour, sampling, wear and attrition of particles, mixing en segregation, design of silos and hoppers and the behaviour of powders in these unit operations will be communicated. Several experts with a particle technology background will be active teachers and lecturers in the course. Besides lectures, various experimental set-ups for investigation of powders and granules will be demonstrated during these two days.
Please contact us for further information or subscribe at this page.
In our next seminar, which will be organized in October 2017, we will be focusing on the various topics connected with the theme of Powder Flow. Think of:
– Importance of Powder Flow, also in relation to particle properties
– Simple measurement methodologies to research and quantify powder flow
– Flow in hoppers and silos and the rational design thereof
– Rheological methods to study powder behaviour
– Consolidation and caking in Big Bags
– Stickiness of powders due to exposure to variable temperature and/or humidity
– Hardware processing tools to avoid, suppress, or overcome undesired flow problems
We also aim to have an interactive workshop in the afternoon where participants will work in teams to put things into practice.
We will soon launch a dedicated page to provide more detailed information on the Powder Flow seminar.
The following details are already known:
Location: WorldHotel Wings in Rotterdam
Date: One day in 2nd or 3rd week of October 2017
On Tuesday May 16th, 2017 we will organize in close cooperation with partner companies a 1-day seminar on the topic of dustiness (of solid matter).
Health, safety and environment, regulation, quantification and qualification of dust, causes of dust formation, suppression of dust formation and dust release and explosion prevention are all examples of themes where dustiness is important.
Well known players and users active in this field, such as DSM, Buro Blauw, TNO, and Delft Solids Solutions are some participants that will be present and deliver lectures to share their knowledge with you on this theme.
The event will be held in the Wings Worldhotel, The Hague Airport in Rotterdam and the course language is English.
Please check our seminar pages regularly for an up-to-date status of this seminar and also the final program.
Delft Solids Solutions will actively participate in the upcoming Interpore meeting in Venlo, the Netherlands, both as a participant and as exhibitor. The annual Interpore Benelux Day 2016 will be organized on Friday October 7th in Venlo and attracts people from all over the Benelux area. People that are active in research and applications of porous media and the flow and transport in those materials.
The course language is English.
More information on this event can be found via the Interpore website using this link.
On Tuesday October 25th, 2016 we will organize in close cooperation with partner companies a 1-day seminar on the topics of agglomeration and granulation.
Suppression of segregation, preventing dustiness formation, creating instant properties, or facilitating dosing are all examples of themes where agglomeration and granulation can play an important role.
Well known players and users of these technologies such as DSM, Abbott Healthcare, Hosokawa, GEA en Glatt will be present and deliver lectures to share their knowledge with you on this theme. Part of the afternoon session will consist of an interactive workshop.
The event will be held in the Wings Worldhotel, The Hague Airport in Rotterdam and the course language is English.
Please check our seminar pages regularly for an up-to-date status of this seminar and also the final program.
The 21st June edition of the highly-ranked journal Chemical Society Reviews features the review paper of Verboekend et al. on its front cover.
The paper entitled “Synthesis, characterisation, and catalytic evaluation of hierarchical faujasite zeolites: milestones, challenges, and future directions” is a joined effort of the ETH Zurich (Switzerland) and K.U. Leuven (Belgium) universities and Delft Solids Solutions and discusses the state-of-the art achievements in the field of hierarchically-structured zeolites with the aim of enhanced physical transport and a more efficient utilization.
A link to the full paper in pdf can be found here.
In its May 2016 edition, number 3, the Dutch magazine “BULK Solids Processing & Handling” features an extensive review of the Mixing Day 2016, organized by Delft Solids Solutions in Nootdorp, The Netherlands, on April 5th 2016.
The image below links you to the on-line edition of the respective article (in Dutch).
Seminar on mixing and segregation of solids and powders
During this 1-day meeting we gather parties that are active in the area of mixing of solids and powders.
The day will be held in English and during the morning session lectures will be delivered by different companies:
Hosokawa and Lindor have confirmed their presence and active participation as well as Abbott Healthcare, DSM/TUDelft, Aspen Oss, and Delft Solids Solutions.
In the afternoon session, an interactive program with case studies will be organized.
A perfect opportunity to meet and discuss with colleagues that are working in the intruiging area of mixing (and segregation) of all sorts of solid materials.
Course Powders & Granules – Physical Properties and Behaviour
The course Powders & Granules will be organized on November 5-6, 2015 at our premises in Wateringen.
In this 2-days course topics like granulation, powder flow behaviour, sampling, wear and attrition of particles, mixing en segregation, design of silos and hoppers and the behaviour of powders in these unit operations will be communicated. Several experts with a particle technology background will be active in the course and various experimental set-ups for investigation of powders and granules will be demonstrated during these two days.
Seminar over mengen en ontmengen van vaste stoffen en poeders
Tijdens deze 1-daagse bijeenkomst brengen we partijen samen op het terrein van vaste stof mengen. De voertaal is Nederlands en er worden lezingen gegeven door vooraanstaande partijen op dit vakgebied.
Denk hierbij aan Hosokawa en Lindor als bekende leveranciers van verschillende type mengers evenals partijen werkzaam in het vakgebied mengen in chemie, food, feed en farma.
Inmiddels hebben sprekers van Abbott Healthcare, DSM/TUDelft, Aspen Oss, Zetadec,Friesland Campina en Delft Solids Solutions tevens hun deelname bevestigd en zijn er discussies met andere partijen uit de feed en food sector over extra inhoudelijke bijdragen.
Een ideale mogelijkheid om tijdens één bijeenkomst kennis op te doen van leveranciers en gebruikers en om te netwerken met collega‘s uit eenzelfde discipline. De dag wordt afgesloten met een netwerkborrel.
Kijk op de NL editie van de website onder mengdag2015 voor nadere informatie of…
New flyer research possibilities
We have recently renewed our research flyer.
A pdf version of this flyer can be downloaded via this link .
This article has recently been published and it provides a general overview of airborne dust particles, their hazards and approaches to measure, quality, and quantify airborne dust particles. The article also includes the recent development at Delft Solids Solutions related to the so-called “Continuous Drop” methodology for respirable and inhalable dust characterization.
A pdf version of this article can be downloaded via this link .
Based on this article, a dutch version has been published in the special Dust Control 2014 of Bulk magazine.
Please find here the link to the Dutch article as published in Stofbestrijding 2014.
Delft Solids Solutions open dag en seminar
Delft Solids Solutions organiseert een open dag in haar nieuwe pand in Wateringen. Op 15 mei kunt u vanaf 13:30 uur binnenlopen aan de Molenweer 2 B in Wateringen. Er is dan een poster seminar waarin we op inzichtelijke wijze onze activiteiten toelichten en u het laboratorium kunt bezichtigen onder het genot van een drankje en een hapje.
Klik op onderstaande link om u te registreren voor deze open dag, waarbij u nader kennis kunt maken, even bij kunt praten, en uiteraard ook nog wat kunt opsteken van het poster seminar en onze nieuwste activiteiten.
Aan de registratie zijn verder geen kosten verbonden, maar is voor ons team om met uw komst rekening te kunnen houden.
New location and Field Testing Area
Delft Solids Solutions has recently moved to a new location in Wateringen. Beside new offices and a new laboratory space, divided over three different labs with a total area of 250 m2, we now also possess a so-called Field Testing Area. This latter facility has an area of 200 m2 and an effective height of 6 meters. Here, larger pilot plant set-ups can be built and researched, which can mimic the true situation on site or in the factory.
Coupled to our laboratory facilities and our expertise, this enables to offer the best-possible solutions in the area of particle characterization.
An impression of our new facilities:
Delft Solids Solutions as validated supplier
With great pleasure we can inform you that since February 17th, 2013, the laboratory of Delft Solids Solutions has been approved as validated supplier of nano particle characterization by the “Joint Research Centre” of the European Community.
Especially in view of the more stringent regulations on the registration of nanomaterials and the possible presence of nano particles in all sort of materials, we feel this as being a very valuable recognition.
On request, a copy of this validation can be provided.
Various methods for assessment of dustiness potential
Delft Solids Solutions now offers a variety of instruments and methods to investigate the dustiness potential of (powdered) solids.
The Heubach method quantifies the total suspended dust content. This method is practised in accordance with the German DIN 55992 standard and the total dust is typically expressed in mg/kg (ppm).
Via the Stauber-Heubach method the total dust content can be determined as it is required by a.o. the EFSA (European Food Safety Authority, the EU risk assessment body for food and feed safety) for introduction of new food and feed products on the European market. The dust content is regularly expressed in mg/m3 air.
Delft Solids Solutions also offers dustiness potential analysis following the European EN 15051standard. The approach classifies the collected dust into three fractions: Inhalabe, Thoracic, and Respirable. This enables to correlate how far the particles could penetrate into the respiratory tract and predict their harmfullness.This method is frequently recommended and applied by the US Environmental Protection Agency (EPA).
A close collaboration of 4 years of Delft Solids Solutions wth leading scientists in an IUPAC (International Union of Pure and Applied Chemistry) framework has led to an in-depth article on the characterizaton of macroporous solids. In this paper, various techniques that are potential alternatives for mercury intrusion porosimetry are being reviewed.
The paper has just been published in Pure and Applied Chemistry; a pdf of the respective article can be downloaded via the IUPAC website.
Close cooperation with two leading research institutes in Europe has led to two new research contributions in scientific journals.
The first paper describes the full compositional flexibility of the desilication post-treatment leading to combined micro- and mesoporous zeolites over the full range of Si/Al ratios. This confirms the universality of the desilication treatment for preparation of hierarchical zeolites.
The other contribution evidences that substantial alleviation of diffusional limitations by introduction of mesopores in the microporous matrix not only occurs in large-crystal zeolites, but also in nano crystalline commercial zeolites. This emphasizes the practical implication of the desilication treatment for commercial applications in which nano crystalline zeolites are employed.
“Influence of Crystal Size and Probe Molecule on Diffusion in Hierarchical ZSM-5 Zeolites Prepared by Desilication”, Microporous Mesoporous Mater. (2011) in press.
Considerable efforts are often devoted to the mixing of several different species of powders (of various sizes, shapes and densities) in order to have a homogeneous mixture of the intermediate or final product. Nevertheless, a well-mixed system may segregate during handling, e.g. when discharging into a bin or big-bag, transportation in a truck or pipe-line, but this could also occur when loading the powder in e.g. a tablet press for production of pharmaceutical tablets. Surprisingly, this phenomenon is often overlooked or not adequately tackled.
Prediction and quantification of this segregation phenomenon can now be executed in our laboratory. The fluidization segregation tendency of powders is assessed in accordance with ASTM D 6941 standard. In this segregation test, a fixed volume of a representative powder sample is fluidized and collected in different fractions. Subsequently, typical characteristics (e.g. particle size or density) of the top and bottom fraction are determined in order to quantify the segregation tendency of the sample. This experimental approach improves the understanding of how transportation and handling efforts can lead to the often undesired segregation of powders.
Please contact our staff for further information.
The close cooperation between Delft Solids Solutions and the Catalysis Engineering group of Professor Javier Perez-Ramirez at the ETH in Zurich has resulted in a book chapter in “Novel Concepts in Catalysis and Chemical Reactors”, a book that appeared on the market recently and is publised by Wiley.
The book chapter entitled “Hierarchical Porous Zeolites by Demetallation” discusses the various methodologies to modfy zeolites in order to make of more efficient usage of these materials in catalysis. Besides dealumination and detitanation, the successful metthod of desilication is extensively disucssed and a state-of-the-art review is given on the work published in this field.
More information on “Novel Concepts in Catalysis and Chemical Reactors” can be found on the Wiley website:
The Hosokawa Powder Processing Experience is a unique opportunity to combine powder processing theory with practice!
The event is organized at the Hosokawa Micron facilities in Doetinchem, The Netherlands.
Besides finding out what goes on behind the scenes at Hosokawa Micron, you can also discuss your problems and needs in the field of bulk solids handling and characterization with the staff of Delft Solids Solutions, one of the exhibitors during this event.
Experience the ‘art’ of powder processing and its many applications. Let the masters inspire you to continue developing and improving your own products.
Delft Solids Solutions participates as an exhibitor in the “Powder Experience” days in Doetinchem, November 17-18th, 2010. Discuss your bulk solids matter with the staff of Delft Solids Solutions…
More information about the program and registration can be found here.
During this one-day event, which will be held at Unilever Research & Development in Vlaardingen at November 10th, 2010, various physical aspects of particle characterization will be discussed. Lectures on surface phenomena and theology are scheduled by national speakers and speakers from abroad. Dr. Johan Groen of Delft Solids Solutions will present an introductory talk on the principles and applications of porosity measurement. This will include techniques as physical gas adsorption, mercury intrusion porosimetry, but also related techniques like electron microscopy and chemisorption.
Location: Unilever Research & Development in Vlaardingen,The Netherlands
Date: November 10th, 2010
More information and a preliminary program can be found on the website of the NWDK working group:
Delft Solids Solutions will attend the following exhibitions in 2010:
Powtech 2010, 27-29 April 2010, Nurnberg, Germany.
During this one-day seminar, Dr. Johan Groen Of Delft Solids Solutions will present a lecture devoted to the principles and applications of porosity characterization by adsorption and porosimetry techniques. The one-day seminar is free of charge and will be organized in Delft, the Netherlands.
In de maart uitgave van het vakblad Solids Processing is een artikel opgenomen met als titel: “Kennis Maakt Stroming”. Het artikel dat tot stand is gekomen na een interview op locatie beschrijft de activiteiten van Delft Solids Solutions, o.a. met betrekking tot onderzoek aan en karakterisering en begrip van vaste stoffen gericht op de stortgoedsector.
De verwijzing naar de website van Solids Processing en het bewuste artikel op pagina 36 van editie 2009-1 is opgenomen onder deze link.
Dr. Johan Groen of Delft Solids Solutions delivers an oral presentation during the NCCC conference in Noordwijkerhout in the Netherlands. The lecture concerns the application of desilication to constitute hierarchical zeolites of different chemcial composition.
The lecture evidences that the use of desilication is not restricted to aluminosilicate zeolites having silicon and aluminium in the framework, but can also be applied to zeolites containing other trivalent cations (Fe, B, en Ga). These cations regulate in a similar way the silicon extraction towards mesoporosity development. These results prove desilication to be a fairly universal methodology for post-synthesis modification of zeolites of different framework topology but also of different chemical composition. Desilication can be used to process a wide variety of zeolites into valuable hierarchical structures.
The lecture will be held on 3 March 2009, 09:55 h.
More information can be found on the website: NCCC
Dr. Johan Groen of Delft Solids Solutions will present an oral lecture in the FEZA conference.
The presentation entitled “Boosted Alkylation Performance of Desilicated Mesoporous Mordenite” will elaborate on the enhanced activity and improved selectivity and stability of the mesoporous mordenite catalyst obtained by a desilication post-treatment. Introduction of mesopores in the purely microporous matrix effectively shortens the micropore diffusion path length and improves the accessibility of the zeolites crystals. Combined with the preserved acidic properties in the hierarchically architectured mordenite, this leads to a more efficient utilization of the zeolite matter.
The FEZA conference is devoted to state-of-the-art research activities in the field of zeolites and other porous materials. The meeting will be held from 2-6 September 2008 in College de France in the heart of Paris, France.
Further details can be found at: FEZA2008
Delft Solids Solutions will attend the exhibition Het Instrument 2008, which will be held in Utrecht, The Netherlands from 20-23 May 2008. Het Instrument combines in one trade fair the unique concept of knowledge, technology, and innovation for industry and science. Consult our specialists at booth no. 8-F014.
Visit the website at: Het Instrument 2008
The range of pore size characterization by mercury intrusion porosimetry has been extended from 120 micrometers to approx. 850 micrometers by investment in an ultramacropore tool. This enables quantitative analyses over an even wider range of pore sizes and offers the possibility of handling larger samples up to several centimeters in size and several grams of sample weight. The expansion of the pore size range will better serve e.g. the pharmaceutical and road construction sector where this type of porosity is of vital importance.
Delft Solids Solutions gaat live op de website Pharamaceutical-Technology.com met het oog op de uitbreiding van haar activiteiten richting de farmaceutische industrie en medische toepassingen, vooral in verband met bottransplantaat materialen en medicijnen. De website bundelt bedrijven die actief zijn op het gebied van de farmacie en fungeert als een referentiepunt door professionals in de farmaceutische industrie.