{"id":5209,"date":"2025-04-24T14:08:44","date_gmt":"2025-04-24T14:08:44","guid":{"rendered":"https:\/\/www.cepi-eurokraft.org\/?p=5209"},"modified":"2025-05-19T09:03:48","modified_gmt":"2025-05-19T09:03:48","slug":"speed-of-filling-50-kg-cement-in-paper-sacks-and-in-wpp-sacks","status":"publish","type":"post","link":"https:\/\/www.cepi-eurokraft.org\/?p=5209","title":{"rendered":"Speed of filling 50 kg cement in paper sacks and in WPP sacks"},"content":{"rendered":"[et_pb_section fb_built=”1″ admin_label=”section” _builder_version=”4.16″ global_colors_info=”{}”][et_pb_row _builder_version=”4.27.4″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_image src=”https:\/\/www.cepi-eurokraft.org\/wp-content\/uploads\/2025\/04\/Paper-Sack-vs.-WPP-sack-FINAL.png” align=”center” align_tablet=”center” align_phone=”” align_last_edited=”on|desktop” _builder_version=”4.27.4″ width=”59%” animation_direction=”left” border_width_all=”2px” border_color_all=”#000000″ animation=”left” sticky=”off” use_border_color=”off” border_color=”#ffffff” border_style=”solid” always_center_on_mobile=”on” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” use_border_color=”off” border_color=”#ffffff” border_style=”solid” ab_goal=”on” global_colors_info=”{}”]\n

The results in this fact sheet refer only to these lab tests and to the conditions during the period of tests.<\/em><\/p>\n

Study overview<\/span><\/strong>
CEPI Eurokraft conducted a lab test to compare the speed of filling 50 kg cement into a paper sack versus a woven polypropylene (WPP) sack. The test was performed using a Haver & Boecker single spout impeller packer at the Billerud Packaging Development Center in Karlsborg, Sweden. The cement used was Portland cement from Heidelberg Materials in Slite, Sweden, with a density of 1,4 kg\/l and a Blaine value of 4,132 cm\u00b2\/g. Note, paper is suited also for higher cement Blaine values.<\/p>\n

Packaging specifications<\/strong><\/p>\n

<\/strong><\/p>\n[\/et_pb_text][et_pb_image src=”https:\/\/www.cepi-eurokraft.org\/wp-content\/uploads\/2025\/04\/Packaging-specifications.jpg” _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”-38px|||||” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]\n

Test methodology<\/strong><\/p>\n

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Five samples per packaging type were filled with 50 kg cement.<\/li>\n
The first two samples for each packaging type were excluded based on machine supplier recommendations.<\/li>\n
An average value was calculated from the three remaining samples.<\/li>\n<\/ul>\n
Key result<\/strong><\/p>\n
Paper sacks are filled 21% faster<\/strong> than WPP sacks with this machine setup.<\/p>\n[\/et_pb_text][et_pb_image src=”https:\/\/www.cepi-eurokraft.org\/wp-content\/uploads\/2025\/04\/Filling-speed-result_2.jpg” align=”center” _builder_version=”4.27.4″ _module_preset=”default” width=”53%” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”]\n
Key findings<\/strong><\/p>\n
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The natural porosity of paper sacks allows for rapid and problem-free venting during filling.<\/li>\n
High-porous paper sacks eliminate the need for additional air extraction systems, reducing complexity and costs.<\/li>\n
Paper sack filling machines require less setup and maintenance, lowering operational expenses.<\/li>\n<\/ul>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.27.4″ _module_preset=”default” custom_margin=”-44px|auto||auto||” custom_padding=”||4px|||” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” inline_fonts=”Abril Fatface” global_colors_info=”{}”]\n
A special mechanical refining process of the long fibres results in a high bonding strength, which gives sack kraft paper its unique strength while at the same time keeping the porosity characteristics.<\/p>\n[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/www.cepi-eurokraft.org\/wp-content\/uploads\/2025\/04\/Long-fibres.jpg” align=”center” _builder_version=”4.27.4″ _module_preset=”default” width=”68%” custom_margin=”|||-51px||” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” min_height=”189.7px” custom_padding=”2px|||||” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”||0px|||” global_colors_info=”{}”]\n
Conclusion
<\/span><\/strong>The study demonstrates that high-porosity paper sacks significantly improve cement filling speed, reducing operational costs and enhancing efficiency compared to WPP sacks.<\/p>\n
A short video summarizes the study:<\/p>\n[\/et_pb_text][et_pb_video src=”https:\/\/youtu.be\/Z8Hy6K-R3dE” image_src=”https:\/\/www.cepi-eurokraft.org\/wp-content\/uploads\/2025\/04\/Paper-Sack-vs.-WPP-sack-FINAL.png” _builder_version=”4.27.4″ _module_preset=”default” width=”100%” module_alignment=”center” custom_margin=”-20px|||||” global_colors_info=”{}”][\/et_pb_video][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.16″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_text _builder_version=”4.27.4″ background_size=”initial” background_position=”top_left” background_repeat=”repeat” hover_enabled=”0″ use_border_color=”off” global_colors_info=”{}” sticky_enabled=”0″]\n
More information<\/span><\/strong><\/span><\/h3>\n
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Fact sheet: “Speed of filling 50 kg cement in paper sacks and in WPP sacks<\/a><\/span>“<\/span><\/li>\n
Full project report: “Comparative analysis of the technical properties and performances of paper sacks vs. woven polypropylene sacks<\/a><\/span>“<\/li>\n<\/ul>\n[\/et_pb_text][et_pb_button button_url=”https:\/\/www.cepi-eurokraft.org\/?p=5151″ button_text=”Back” button_alignment=”center” _builder_version=”4.27.4″ _module_preset=”default” custom_button=”on” button_text_size=”14px” button_text_color=”#42A31B” button_icon=”#||divi||400″ global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"excerpt":{"rendered":"
The results in this fact sheet refer only to these lab tests and to the conditions during the period of tests. Study overviewCEPI Eurokraft conducted a lab test to compare the speed of filling 50 kg cement into a paper sack versus a woven polypropylene (WPP) sack. The test was performed using a Haver & […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"2880","footnotes":""},"categories":[1],"tags":[],"class_list":["post-5209","post","type-post","status-publish","format-standard","hentry","category-okategoriserade"],"_links":{"self":[{"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=\/wp\/v2\/posts\/5209","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5209"}],"version-history":[{"count":49,"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=\/wp\/v2\/posts\/5209\/revisions"}],"predecessor-version":[{"id":5440,"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=\/wp\/v2\/posts\/5209\/revisions\/5440"}],"wp:attachment":[{"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5209"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5209"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cepi-eurokraft.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5209"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}