A system for adjusting a gap in a slot die for producing a polymeric web. The system includes a slot die that has a polymer reservoir that extends between a polymer inlet and a melt outlet. The melt outlet has a first edge and a second edge that each extend longitudinally along the melt outlet. The second edge is opposite the first edge. A plurality of actuators move the second edge along a plurality of positions along a length of the second edge. The first edge is spaced apart from the second edge by a gap that has an adjustable profile. A pressure sensor communicates with the reservoir and measures the pressure of the polymer in the reservoir. A control unit with an algorithm correlates the profile of the gap to the pressure in the reservoir. The algorithm is configured to generate control signals to cause the profile of the gap to be uniform.

The invention relates to an apparatus for providing marks on extruded films, in particular on stretched films, which are exiting an extrusion lip of a film extruder and a respective method. The apparatus comprises at least one nozzle means for directing a gas stream, preferably an air stream to a surface of the film exiting the extrusion lip of the film extruder, wherein the nozzle means are configured and arranged in such a manner that the gas stream locally causes a cooling of the extruded film to create a local mark.

A method comprises the steps of continuously measuring, proximal a tube extrusion die, a diameter of tubing extruded by the die, to produce a plurality of die-measurement or layflat samples; and continuously measuring, downstream of the tube extrusion die and proximal an accumulation point of flattened tubing, a width of the flattened tubing, to produce a plurality of flat-width samples. A slope value is calculated over a selected interval of the layflat samples and the flat-width samples to determine the stability of the diameter of the tubing and the width of the flattened tubing. A y-intercept value is calculated over the selected interval of the layflat samples and the flat-width samples to determine a forecast trend of the diameter of the tubing and the width of the flattened tubing. When the slope values, y-intercept values, and variances are within selected parameters indicative of a stable operation of the tube extrusion die and the accumulation of flattened tubing, the tube extrusion die is calibrated to produce a selected width of flattened tubing.

The invention relates to a method for calibrating adjusting means (120) for adjusting a nozzle slot (112) of a discharge nozzle (110) for a film track (FB) on a flat film machine (100), comprising the following steps: specifying a calibration position (KP) for the adjusting means (120), performing a controlling intervention to change the adjusting position (SP) of the adjusting means (120), acquiring the reaching of the calibration position (KP) of the adjusting means (120).

In a resin-film manufacturing apparatus of an embodiment, when a lip gap control is started, a difference between a state of a target heat bolt (THB) at a start of current control and a state of each of all the heat bolts at a start of last control is obtained, when the difference between the states of THB at the starts of the current and last control is a smallest one, a learning result of THB is set as an initial value of a control condition for THB, and when the difference between the states of THB is not the smallest one, either one of a learning result of the heat bolt of which the difference between the states is smaller than the difference between the states of THB and the learning result of THB is set as the initial value of the control condition for THB.

The present invention relates to an extrusion die and a method for extruding a sheet using the same, and according to one aspect of the present invention, there is provided an extrusion die comprising a storage part configured to hold a raw material, the storage part defining a first width, a pressure part configured to move the raw material through the storage part, a first die defining a second width less than the first width, such that a flow width of the raw material becomes narrower, a second die in fluid communication with the first die, the second die defining a width that increases from the second width to a third width, such that the flow width of the raw material passing through the first die becomes wider and a flow thickness becomes smaller, and a heating part configured to heat the raw material passing through the second die.

The invention relates to a method for switching the production of a flat film machine (100) from a feed product (EP) to a follow-on product (FP), comprising the following steps: recognizing a switching request for a switch from the feed product (EP) to the follow-on product (FP), determining a current feed control value (ES) of at least one control variable (SG) of the flat film machine (100) for the feed product (EP), determining a follow-on control value (FS) of the same at least one control variable (SG) for the follow-on product (FP), generating a control signal (SS) for a defined variation of the at least one control variable (SG) of the flat film machine (100) from the feed control value (ES) to the follow-on control value (FS).

Provided is a fluorine-based resin multilayer film for vacuum forming which does not cause wrinkles and the like when a three-dimensional surface decoration method is applied. The fluorine-based resin multilayer film for vacuum forming includes a front surface layer containing 60% by mass to 85% by mass of a vinylidene fluoride-based resin and 40% by mass to 15% by mass of a methacrylate ester-based resin; and a back surface layer containing 0% by mass to 50% by mass of a vinylidene fluoride-based resin and 100% by mass to 50% by mass of a methacrylate ester-based resin, wherein the thermal dimensional change in a film flow direction when heated at 120° C. for 30 minutes, which is measured based on JIS K7133, is −15% to −2%.

The invention relates to a method for automatically regulating the size of a nozzle discharge slot of a nozzle assembly, wherein the nozzle assembly comprises a first and a second nozzle lip and a nozzle discharge slot arranged between the nozzle lips for setting in a controlled manner a thickness profile of a conveyable melt. A plurality of adjusting elements, in particular a plurality of adjusting pins, coupled to a respective thermoelement, is arranged on the first nozzle lip, the thermoelements being controllable by the regulation in such a way that the slot can be adjusted by the action of a mechanical force from the respective adjusting element on the first nozzle lip, as a result of the expansion or contraction of the thermoelements. At an initial operation of the nozzle assembly for conveying the melt, the adjusting elements for subsequent regulation of the slot size are set uniquely free from play as the initial setting. The invention further relates to a control and/or regulation system.

Provide is a blown film forming apparatus including a die including a columnar inner peripheral member and a cylindrical outer peripheral member that surrounds the inner peripheral member, and extruding a resin from a lip formed between the inner peripheral member and the outer peripheral member, and a plurality of die lip drive mechanisms including a fluid pressure actuator as a drive source and adjusting a lip width by applying a radial load to the outer peripheral member, in which the outer peripheral member includes a plurality of load receiving portions to which a load is applied by the die lip drive mechanism, and a stiffness reducing portion that is provided between the plurality of load receiving portions.