In the spreadsheet app itself, you have the options to print only a specific sheet. You also can turn off the grid lines when creating the pdf from within the app. Is ther
Google apps script to create a pdf of a specific sheet of a spreadsheet.
function generatePdf() {
var originalSpreadsheet = SpreadsheetApp.getActive();
var sourcesheet = originalSpreadsheet.getSheetByName("Sheet - Name");
var sourcerange = sourcesheet.getRange('A1:G7'); // range to get - here I get all of columns which i want
var sourcevalues = sourcerange.getValues();
var data = sourcesheet.getDataRange().getValues();
var newSpreadsheet = SpreadsheetApp.create("Spreadsheet to export"); // can give any name.
var sheet = SpreadsheetApp.getActiveSpreadsheet().getActiveSheet();
var projectname = SpreadsheetApp.getActiveSpreadsheet();
var sheet = sourcesheet.copyTo(newSpreadsheet);
var destrange = sheet.getRange('A1:G7');
destrange.setValues(sourcevalues);
newSpreadsheet.getSheetByName('Sheet1').activate();
newSpreadsheet.deleteActiveSheet();
var pdf = DriveApp.getFileById(newSpreadsheet.getId());
var theBlob = pdf.getBlob().getAs('application/pdf').setName("name");
var folderID = "Folder Id"; // Folder id to save in a folder.
var folder = DriveApp.getFolderById(folderID);
var newFile = folder.createFile(theBlob);
DriveApp.getFileById(newSpreadsheet.getId()).setTrashed(true);
}