A closure system comprising a pulp molded cap and a pulp molded container, a pulp molded container, a pulp molded cap, a method and a tool for producing a cap or cap part from a pulp slurry

Abstract

The present disclosure relates to a closure system (100), comprising: a pulp molded container (200) comprising a wall portion (201) which surrounds a product space (2000) presenting a cross-sectional area, wherein said wall portion extends along an axial direction perpendicular to the cross-sectional area, between a first open end (203) and a second end (204) being axially opposite said first open end, wherein a first end wall portion (205) extending from said first open end has a first substantially conical sealing surface (206) presenting a first angle relative to the axial direction; and a pulp molded cap (300) having a second substantially conical scaling surface (306) presenting a second angle relative to the axial direction; wherein the first and second angles substantially match, and wherein one of said first and second substantially conical sealing surfaces (206, 306) presents at least one male partial thread (210) and the other one of said first and second substantially conical sealing surfaces (206, 306) presents at least one corresponding female partial thread (310). The disclosure further relates to a method for producing a cap or cap part from a pulp slurry, and a tool for producing a cap or cap part from a pulp slurry.

1 . A closure system comprising:
 a pulp molded container comprising a wall portion which surrounds a product space presenting a cross-sectional area, wherein said wall portion extends along an axial direction perpendicular to the cross-sectional area, between a first open end and a second end being axially opposite said first open end, wherein a first end wall portion extending from said first open end has a first substantially conical sealing surface presenting a first angle relative to the axial direction; and   a pulp molded cap having a second substantially conical sealing surface ( 306 ) presenting a second angle relative to the axial direction;   wherein the first and second angles substantially match, and   wherein one of said first and second substantially conical sealing surfaces ( 206 ,  306 ) presents at least one male partial thread and the other one of said first and second substantially conical sealing surfaces presents at least one corresponding female partial thread.   
     
     
         2 . The closure system according to  claim 1 , wherein the first substantially conical sealing surface is a first inwardly substantially conical sealing surface, and the second substantially conical sealing surface is a second outwardly substantially conical sealing surface. 
     
     
         3 . The closure system according to  claim 1 , wherein a cross section of the first substantially conical sealing surface diminishes inwardly from the open end. 
     
     
         4 . The closure system according to  claim 1 , wherein
 the first end wall portion forms an inner wall portion that extends from the open end and which has said first substantially conical sealing surface; and   the wall portion ( 201 ) forms an outer wall portion, formed radially outwardly of the inner wall portion and extending from the open end ( 203 ) towards the second end ( 204 ) of the container,   wherein an axial extent of the outer wall portion is greater than an axial extent of the inner wall portion, and   wherein the inner and outer wall portions are formed in one piece of material.   
     
     
         5 . The closure system according to  claim 1 , wherein the first substantially conical sealing surface is a first outwardly substantially conical sealing surface, and the second substantially conical sealing surface is a second inwardly substantially conical sealing surface. 
     
     
         6 . The closure system according to  claim 1 , wherein a cross section of the first substantially conical sealing surface increases outwardly along the axial direction from the open end. 
     
     
         7 . The closure system according to  claim 1 , wherein a container wall portion at the second end is inwardly conical with a cross section diminishing inwardly along the axial direction from the second end. 
     
     
         8 . The closure system according to  claim 1 , wherein the at least one partial thread is spaced from at least one, or both, axially extreme portions of at least one of the first and second substantially conical sealing surfaces. 
     
     
         9 . The closure system according to  claim 8 , wherein the at least one partial thread is spaced from the at least one axially extreme portion at least by a distance corresponding to 1-50%, 1-40%, 1-35%, 1-30%, 2-25%, 3-20%, 4-15% or 5-10%, of an axial extent of said at least one of the first and second substantially conical sealing surfaces. 
     
     
         10 . The closure system according to  claim 1 , wherein the at least one partial thread extend between a first and a second axially extreme portion of at least one of the first and second substantially conical sealing surfaces. 
     
     
         11 . The closure system according to  claim 1 , wherein the at least one partial has a thread rising angle being larger than 0° and less than 90°, or 1-5°, 5-10°, 10-15°, 15-20°, 20-25°, 25-30°, 30-35°, 35-40°, 45-50°, 50-55°, 55-60°, 60-65°, 65-70°, 70-75°, 75-80° er 80-85°, or 50-80°. 
     
     
         12 . The closure system according to  claim 1 , wherein a length of the at least one partial thread corresponds to about 1/32 to ⅓ of a turn, 1/32 to ¼ of a turn, 1/24 to ⅕ of a turn, 1/16 to ⅙ of a turn, or 1/12 to ⅛ of a turn. 
     
     
         13 . The closure system according to  claim 1 , wherein the at least one partial thread has a tapering end portion. 
     
     
         14 . The closure system according to  claim 1 , wherein the at least one male partial thread comprises portions of varying height. 
     
     
         15 . The closure system according to  claim 1 , wherein the at least one female partial thread comprises portions of varying depth. 
     
     
         16 . The closure system according to  claim 1 , wherein the at least one partial thread is straight or curved. 
     
     
         17 . The closure system according to  claim 1 , wherein said first and/or second angles are 2-15° 2.5-12°, 3-10° or 4-6° relative to the axial direction. 
     
     
         18 - 21 . (canceled) 
     
     
         22 . A pulp molded container, wherein the container comprises:
 a wall portion which surrounds a product space presenting a cross-sectional area, wherein said wall portion extends along an axial direction perpendicular to the cross-sectional area, between a first open end and a second end being axially opposite said first open end,   wherein a first end wall portion extending from said first open end has a substantially conical sealing surface, and   wherein the substantially conical sealing surface presents at least one partial thread.   
     
     
         23 . A pulp molded cap comprising:
 a substantially conical sealing surface,   wherein the substantially conical sealing surface presents at least one partial thread.   
     
     
         24 . The pulp molded cap according to  claim 23 , comprising:
 a first part ( 320 ) formed of a pulp material, wherein the first part comprises said substantially conical sealing surface, and   a second part ( 330 ) formed of a pulp material, wherein the second part is adapted to at least partly enclose the first part ( 320 ).   
     
     
         25 - 64 . (canceled)